:root {
    --purple: #7c3aed;
    --purple-dark: #6d28d9;
    --purple-light: #faf5ff;
    --border: #ddd6fe;
    --green: #16a34a;
    --green-bright: #22c55e;
    --blue: #2563eb;
    --cyan: #06b6d4;
    --amber: #f59e0b;
    --rose: #e11d48;
    --ink: #111827;
    --muted: #64748b;
    --surface: #ffffff;
    --site-main-max: 1600px;
    --site-header-max: 1600px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: linear-gradient(180deg, var(--purple-light), #ffffff 45%);
    color: var(--ink);
    overflow-x: hidden;
}

header {
    max-width: 1600px;
    margin: 0 auto;
    padding: 22px 20px;
    display: flex;
    justify-content: flex-start;
    align-items: center;
}

.logo {
    font-weight: 900;
    color: var(--purple-dark);
    font-size: 20px;
    text-decoration: none;
}

nav a {
    margin-left: 18px;
    color: #374151;
    text-decoration: none;
    font-weight: 700;
    font-size: 14px;
}

nav a.nav-highlight {
    color: var(--purple-dark);
    background: var(--purple-light);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 7px 11px;
    font-weight: 900;
}

nav a.active {
    color: var(--purple-dark);
    font-weight: 900;
}

nav a.active:not(.nav-highlight) {
    border-bottom: 2px solid var(--purple-dark);
    padding-bottom: 4px;
}

.learning-page-main {
    max-width: 1600px;
    min-height: calc(100vh - 220px);
    margin: 0 auto;
    padding: clamp(16px, 2vw, 24px) 20px 64px;
    display: grid;
    grid-template-columns: minmax(210px, 230px) minmax(0, 1fr) clamp(230px, 16vw, 250px);
    gap: clamp(18px, 2vw, 24px);
    align-items: start;
}

.learning-nav-column {
    position: sticky;
    top: 16px;
    min-height: 0;
    padding: 10px;
    border: 2px solid #cbd5e1;
    border-radius: 18px;
    background: linear-gradient(180deg, #f8fafc, #eef2f7);
    box-shadow: 0 16px 36px rgba(15, 23, 42, 0.08);
}

.learning-rail {
    display: grid;
    gap: 8px;
    max-height: calc(100vh - 150px);
    overflow-y: auto;
    padding: 4px;
    scrollbar-width: thin;
    scrollbar-color: rgba(37, 99, 235, 0.45) rgba(226, 232, 240, 0.72);
}

.learning-rail::-webkit-scrollbar {
    width: 8px;
}

.learning-rail::-webkit-scrollbar-track {
    border-radius: 999px;
    background: rgba(226, 232, 240, 0.72);
}

.learning-rail::-webkit-scrollbar-thumb {
    border-radius: 999px;
    background: linear-gradient(180deg, #22c55e, #2563eb);
}

.learning-nav-link {
    display: grid;
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 10px;
    align-items: center;
    min-height: 54px;
    padding: 8px 12px;
    border: 1px solid transparent;
    border-radius: 12px;
    background: #ffffff;
    color: #374151;
    text-decoration: none;
    font-size: 12px;
    font-weight: 900;
    line-height: 1.15;
    text-transform: uppercase;
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
    transition: transform 0.14s ease, border-color 0.14s ease, background 0.14s ease, color 0.14s ease;
}

.learning-nav-link:hover,
.learning-nav-link:focus-visible {
    border-color: rgba(124, 58, 237, 0.34);
    background: linear-gradient(180deg, #ffffff, #faf5ff);
    color: var(--purple-dark);
    transform: translateY(-1px);
    outline: none;
}

.learning-nav-link.is-active {
    border-color: #22c55e;
    background: linear-gradient(180deg, #ffffff, #ecfdf5);
    color: #166534;
    box-shadow: 0 12px 26px rgba(22, 163, 74, 0.16);
    animation: learningActiveGlow 3s ease-in-out infinite;
}

.learning-nav-icon {
    display: grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: #dcfce7;
    color: #166534;
    font-size: 17px;
    font-weight: 900;
    line-height: 1;
}

.learning-nav-link:nth-child(3n + 1) .learning-nav-icon {
    background: #dcfce7;
    color: #166534;
}

.learning-nav-link:nth-child(3n + 2) .learning-nav-icon {
    background: #dbeafe;
    color: #1d4ed8;
}

.learning-nav-link:nth-child(3n) .learning-nav-icon {
    background: #ffedd5;
    color: #c2410c;
}

.learning-nav-link:nth-child(4n) .learning-nav-icon {
    background: #ffe4e6;
    color: #be123c;
}

.learning-nav-link.is-active .learning-nav-icon {
    background: linear-gradient(135deg, #16a34a, #22c55e);
    color: #ffffff;
    animation: learningIconBob 2.8s ease-in-out infinite;
}

.learning-nav-label {
    min-width: 0;
    white-space: normal;
}

@keyframes learningActiveGlow {
    0%, 100% {
        box-shadow: 0 12px 26px rgba(22, 163, 74, 0.16);
    }
    50% {
        box-shadow: 0 16px 34px rgba(37, 99, 235, 0.18);
    }
}

@keyframes learningIconBob {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-2px);
    }
}

@keyframes learning-panel-in {
    0% {
        opacity: 0;
        transform: translateY(10px);
    }

    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.learning-page-content {
    min-width: 0;
    border: 2px solid #94a3b8;
    border-radius: 22px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    padding: clamp(18px, 2.4vw, 24px) clamp(18px, 2.4vw, 24px) 26px;
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.1);
    animation: learning-panel-in 520ms ease-out;
}

.learning-kicker {
    display: block;
    margin-bottom: 8px;
    color: #16a34a;
    font-size: 12px;
    font-weight: 900;
    text-transform: uppercase;
}

.learning-title {
    margin: 0;
    color: var(--purple-dark);
    font-size: clamp(34px, 5vw, 58px);
    line-height: 0.98;
}

.learning-copy {
    max-width: 760px;
    margin: 14px 0 24px;
    color: var(--muted);
    font-size: 16px;
    line-height: 1.6;
}

.learning-dashboard-top {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
    align-items: start;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 4px solid #9ca3af;
}

.learning-dashboard-top--read {
    grid-template-columns: minmax(0, 1fr) minmax(220px, 360px);
    align-items: start;
    gap: 16px;
}

.write-dashboard-header {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
}

.learning-dashboard-top .learning-copy {
    margin-bottom: 0;
}

.write-development-chip {
    justify-self: end;
    margin-top: 4px;
    padding: 7px 12px;
    border: 1px solid #c4b5fd;
    border-radius: 10px;
    background: #f5f3ff;
    color: #6d28d9;
    font-size: 11px;
    font-weight: 900;
    line-height: 1;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.learning-dashboard-top [data-learning-daily-goal-panel] {
    display: none;
}

.learning-side-rail {
    position: sticky;
    top: 16px;
    display: grid;
    gap: 10px;
    min-width: 0;
}

.learning-side-panel {
    display: grid;
    gap: 10px;
    padding: 12px;
    border: 2px solid #cbd5e1;
    border-radius: 14px;
    background: linear-gradient(180deg, #ffffff, #f1f5f9);
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.08);
}

.learning-player-card {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 10px;
    align-items: center;
    min-height: 64px;
    padding: 10px;
    border: 2px solid #94a3b8;
    border-radius: 10px;
    background: linear-gradient(180deg, #ffffff, #f1f5f9);
    box-shadow: 0 10px 22px rgba(15, 23, 42, 0.06);
    transform: translateY(0);
    transition: transform 0.16s cubic-bezier(.2, .8, .2, 1), box-shadow 0.16s ease, border-color 0.16s ease;
}

.learning-player-card:hover,
.learning-player-card:focus-within {
    border-color: #7c3aed;
    box-shadow: 0 14px 28px rgba(88, 28, 135, 0.14);
    transform: translateY(-3px);
}

.learning-player-avatar {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    border: 2px solid #c4b5fd;
    border-radius: 8px;
    background: linear-gradient(180deg, #ffffff, #f5f3ff);
    color: var(--purple-dark);
    font-size: 12px;
    font-weight: 900;
    line-height: 1;
    overflow: hidden;
}

.learning-player-avatar img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 4px;
}

.learning-player-card span:not(.learning-player-avatar) {
    display: block;
    color: var(--muted);
    font-size: 11px;
    font-weight: 900;
    text-transform: uppercase;
}

.learning-player-card strong {
    display: block;
    min-width: 0;
    margin-top: 2px;
    color: var(--purple-dark);
    font-size: 16px;
    line-height: 1.15;
    overflow-wrap: anywhere;
}

.learning-side-section {
    display: grid;
    gap: 10px;
    padding: 12px;
    border: 2px solid #94a3b8;
    border-radius: 10px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(248, 250, 252, 0.94));
    box-shadow: 0 10px 22px rgba(15, 23, 42, 0.06);
    transform: translateY(0);
    transition: transform 0.16s cubic-bezier(.2, .8, .2, 1), box-shadow 0.16s ease, border-color 0.16s ease;
}

.learning-side-section:hover,
.learning-side-section:focus-within {
    border-color: #7c3aed;
    box-shadow: 0 14px 28px rgba(88, 28, 135, 0.14);
    transform: translateY(-3px);
}

.learning-side-section h3 {
    margin: 0;
    color: var(--purple-dark);
    font-size: 15px;
    font-weight: 900;
    line-height: 1.2;
}

.learning-progress-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
}

.learning-progress-stat {
    display: grid;
    grid-template-rows: 24px auto auto;
    align-items: start;
    justify-items: center;
    gap: 3px;
    min-width: 0;
    min-height: 58px;
    padding: 7px 5px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    text-align: center;
    overflow: hidden;
}

.learning-progress-stat:nth-child(1) {
    border-color: #c4b5fd;
    background: linear-gradient(180deg, #ffffff, #faf5ff);
}

.learning-progress-stat:nth-child(2) {
    border-color: #bbf7d0;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.stat-icon {
    display: inline-grid;
    place-items: center;
    justify-self: center;
    align-self: start;
    box-sizing: border-box;
    width: auto;
    max-width: 100%;
    height: 24px;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: #334155;
    font-size: 18px;
    font-weight: 900;
    line-height: 1;
    box-shadow: none;
}

.learning-progress-stat strong {
    display: block;
    color: var(--ink);
    font-size: 18px;
    line-height: 1.2;
}

.learning-progress-stat .stat-label {
    display: block;
    color: var(--muted);
    font-size: 10px;
    font-weight: 900;
    letter-spacing: 0;
    line-height: 1.1;
    text-transform: uppercase;
}

.learning-vocabulary-stats {
    display: grid;
    gap: 8px;
    padding-top: 2px;
}

.learning-vocabulary-stat {
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr) auto;
    gap: 8px;
    align-items: center;
    min-height: 46px;
    padding: 8px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
}

.learning-vocabulary-stat:nth-child(1) {
    border-color: #bfdbfe;
}

.learning-vocabulary-stat:nth-child(2) {
    border-color: #fed7aa;
}

.learning-vocabulary-stat:nth-child(3) {
    border-color: #bbf7d0;
}

.vocabulary-stat-icon {
    display: inline-grid;
    place-items: center;
    width: 42px;
    height: 22px;
    border: 1px solid #cbd5e1;
    border-radius: 5%;
    background: linear-gradient(180deg, #f8fafc, #e5e7eb);
    color: #334155;
    font-size: 12px;
    font-weight: 900;
    line-height: 1;
}

.learning-vocabulary-stat strong {
    color: var(--ink);
    font-size: 18px;
    font-variant-numeric: tabular-nums;
}

.learning-vocabulary-stat span:last-child {
    color: var(--muted);
    font-size: 10px;
    font-weight: 900;
    line-height: 1.15;
    text-align: right;
    text-transform: uppercase;
}

.heart-glyph {
    position: relative;
    display: inline-block;
    color: #ef4444;
    line-height: 1;
}

.heart-glyph.is-half {
    color: #fecdd3;
}

.heart-glyph.is-half::before {
    content: "♥";
    position: absolute;
    inset: 0 auto 0 0;
    width: 50%;
    overflow: hidden;
    color: #ef4444;
}

.learning-health-panel {
    display: grid;
    gap: 8px;
    min-height: 0;
    padding: 12px;
    border: 2px solid #fb7185;
    border-radius: 10px;
    background: linear-gradient(180deg, #ffffff, #fff1f2);
    box-shadow: 0 10px 22px rgba(190, 18, 60, 0.08);
    transform: translateY(0);
    transition: transform 0.16s cubic-bezier(.2, .8, .2, 1), box-shadow 0.16s ease, border-color 0.16s ease;
}

.learning-health-panel:hover,
.learning-health-panel:focus-within {
    border-color: #7c3aed;
    box-shadow: 0 14px 28px rgba(88, 28, 135, 0.14);
    transform: translateY(-3px);
}

.learning-health-countdown {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin: -12px -12px 0;
    padding: 7px 9px;
    border-bottom: 1px solid #fecdd3;
    border-radius: 8px 8px 0 0;
    background: linear-gradient(180deg, #fff1f2, #ffe4e6);
    color: #64748b;
    font-size: 10px;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
}

.learning-health-countdown strong {
    color: #111827;
    font-size: 12px;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0;
    white-space: nowrap;
}

.learning-health-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.learning-health-header > div {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}

.learning-health-icon {
    display: inline-grid;
    place-items: center;
    flex: 0 0 auto;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: linear-gradient(180deg, #ef4444, #be123c);
    color: #ffffff;
    font-size: 15px;
    font-weight: 900;
    box-shadow: 0 8px 18px rgba(190, 18, 60, 0.18);
}

.learning-health-panel h2 {
    margin: 0;
    color: var(--purple-dark);
    font-size: 15px;
    font-weight: 900;
}

.learning-health-header strong {
    flex: 0 0 auto;
    color: #111827;
    font-size: 18px;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.learning-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 14px;
}

.learning-card-link {
    display: block;
    color: inherit;
    text-decoration: none;
}

.learning-card-link:hover,
.learning-card-link:focus-visible {
    outline: none;
}

.learning-card-link:hover .learning-card,
.learning-card-link:focus-visible .learning-card {
    border-color: var(--purple);
    box-shadow: 0 14px 28px rgba(124, 58, 237, 0.18);
    transform: translateY(-2px);
}

.learning-card {
    min-height: 136px;
    padding: 18px;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    box-shadow: 0 10px 26px rgba(15, 23, 42, 0.06);
}

.learning-card h2 {
    margin: 0 0 8px;
    color: var(--purple-dark);
    font-size: 18px;
}

.learning-card p {
    margin: 0;
    color: #374151;
    font-size: 14px;
    line-height: 1.5;
}

.hsk-reading-level-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 14px;
}

.hsk-reading-level-card {
    display: grid;
    gap: 12px;
    min-width: 0;
    padding: 16px;
    border: 3px solid #94a3b8;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.13);
}

.hsk-reading-level-card:nth-child(1) {
    border-color: #22c55e;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.hsk-reading-level-card:nth-child(2) {
    border-color: #3b82f6;
    background: linear-gradient(180deg, #ffffff, #eff6ff);
}

.hsk-reading-level-card:nth-child(3) {
    border-color: #f59e0b;
    background: linear-gradient(180deg, #ffffff, #fff7ed);
}

.hsk-reading-level-card:nth-child(4) {
    border-color: #f43f5e;
    background: linear-gradient(180deg, #ffffff, #fff1f2);
}

.hsk-reading-level-card:nth-child(5) {
    border-color: #06b6d4;
    background: linear-gradient(180deg, #ffffff, #ecfeff);
}

.hsk-reading-level-card:nth-child(6) {
    border-color: #8b5cf6;
    background: linear-gradient(180deg, #ffffff, #faf5ff);
}

.hsk-reading-level-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.hsk-reading-level-badge,
.hsk-reading-story-total {
    display: inline-flex;
    align-items: center;
    min-height: 26px;
    padding: 5px 8px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.86);
    color: #334155;
    font-size: 11px;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
}

.hsk-reading-story-total {
    flex: 0 0 auto;
    color: #475569;
}

.hsk-reading-level-card h2 {
    margin: 0;
    color: var(--purple-dark);
    font-size: 20px;
    line-height: 1.15;
}

.hsk-reading-level-card p {
    margin: 0;
    color: #334155;
    font-size: 14px;
    line-height: 1.45;
}

.hsk-reading-story-list {
    display: grid;
    gap: 8px;
    margin-top: 2px;
}

.read-story-idea-section {
    display: grid;
    gap: 18px;
    margin-top: 22px;
}

.read-story-idea-heading {
    display: grid;
    gap: 6px;
}

.read-story-idea-heading h2 {
    margin: 0;
    color: var(--purple-dark);
    font-size: 26px;
    line-height: 1.15;
}

.read-story-idea-heading p {
    margin: 0;
    color: #475569;
    font-size: 15px;
    line-height: 1.5;
}

.read-story-idea-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 14px;
}

.read-story-idea-card {
    display: grid;
    gap: 12px;
    min-width: 0;
    padding: 16px;
    border: 3px solid #94a3b8;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.1);
}

.read-story-idea-card:nth-child(1) {
    border-color: #22c55e;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.read-story-idea-card:nth-child(2) {
    border-color: #3b82f6;
    background: linear-gradient(180deg, #ffffff, #eff6ff);
}

.read-story-idea-card:nth-child(3) {
    border-color: #f59e0b;
    background: linear-gradient(180deg, #ffffff, #fff7ed);
}

.read-story-idea-card:nth-child(4) {
    border-color: #f43f5e;
    background: linear-gradient(180deg, #ffffff, #fff1f2);
}

.read-story-idea-card:nth-child(5) {
    border-color: #06b6d4;
    background: linear-gradient(180deg, #ffffff, #ecfeff);
}

.read-story-idea-card:nth-child(6) {
    border-color: #8b5cf6;
    background: linear-gradient(180deg, #ffffff, #faf5ff);
}

.read-story-idea-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.read-story-idea-card h3 {
    margin: 0;
    color: var(--purple-dark);
    font-size: 20px;
    line-height: 1.15;
}

.read-story-idea-card p {
    margin: 0;
    color: #334155;
    font-size: 14px;
    line-height: 1.45;
}

.read-story-idea-list {
    display: grid;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.read-story-idea-list li {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 8px 10px;
    align-items: center;
    min-height: 54px;
    padding: 8px;
    border: 2px solid #94a3b8;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.86);
    color: inherit;
    box-shadow: 0 6px 14px rgba(15, 23, 42, 0.06);
}

.read-story-idea-title {
    display: grid;
    gap: 3px;
    min-width: 0;
}

.read-story-idea-title strong {
    color: #111827;
    font-size: 14px;
    line-height: 1.25;
}

.read-story-idea-title span {
    color: #64748b;
    font-size: 13px;
    line-height: 1.25;
    font-weight: 800;
}

.hsk-reading-story-link {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr) 108px;
    gap: 8px 10px;
    align-items: center;
    min-height: 54px;
    padding: 8px;
    border: 2px solid #94a3b8;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.96);
    color: inherit;
    text-decoration: none;
    box-shadow: 0 6px 14px rgba(15, 23, 42, 0.08);
    transform: translateY(0);
    transition: border-color 0.14s ease, background 0.14s ease, box-shadow 0.14s ease;
}

.hsk-reading-story-link:hover,
.hsk-reading-story-link:focus-visible {
    border-color: #7c3aed;
    box-shadow: 0 8px 18px rgba(88, 28, 135, 0.14);
    outline: none;
}

.hsk-reading-story-link.is-premium {
    border-color: #d97706;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), #fffbeb);
}

.hsk-reading-story-index {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: #e5e7eb;
    color: #334155;
    font-size: 12px;
    font-weight: 900;
    line-height: 1;
}

.hsk-reading-story-text {
    display: grid;
    gap: 2px;
    min-width: 0;
}

.hsk-reading-story-text strong,
.hsk-reading-story-text span {
    display: block;
    min-width: 0;
    overflow-wrap: anywhere;
}

.hsk-reading-story-text strong {
    color: #111827;
    font-size: 14px;
    line-height: 1.2;
}

.hsk-reading-story-text span {
    color: #64748b;
    font-size: 11px;
    font-weight: 900;
    line-height: 1.15;
    text-transform: uppercase;
}

.hsk-reading-story-cta {
    position: relative;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2px;
    min-width: 0;
    min-height: 38px;
    padding: 5px 7px;
    border: 1px solid #9ca3af;
    border-radius: 8px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: #111827;
    font-size: 11px;
    font-weight: 900;
    line-height: 1;
    text-align: center;
    text-transform: uppercase;
    overflow: hidden;
    transform: translateY(0) scale(1);
    box-shadow:
        0 2px 6px rgba(0, 0, 0, 0.08);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        background 0.16s ease,
        border-color 0.16s ease;
}

.hsk-reading-story-cta::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.42), transparent);
    pointer-events: none;
    transition: left 0.42s ease;
}

.hsk-reading-story-cta:hover,
.hsk-reading-story-link:focus-visible .hsk-reading-story-cta {
    border-color: #6b7280;
    background: linear-gradient(180deg, #d1d5db, #9ca3af);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px) scale(1.01);
}

.hsk-reading-story-cta:hover::after,
.hsk-reading-story-link:focus-visible .hsk-reading-story-cta::after {
    left: 140%;
}

.hsk-reading-story-cta:active,
.hsk-reading-story-link:active .hsk-reading-story-cta {
    box-shadow: 0 4px 12px rgba(88, 28, 135, 0.12);
    transform: translateY(0) scale(0.985);
}

.hsk-reading-story-cta-main,
.hsk-reading-story-cta-cost {
    position: relative;
    z-index: 1;
    display: block;
}

.hsk-reading-story-cta-cost {
    font-size: 9px;
    font-weight: 800;
    line-height: 1.05;
    opacity: 0.9;
    text-transform: none;
}

.hsk-reading-story-link.is-premium .hsk-reading-story-cta {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: #111827;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.hsk-reading-story-link.is-premium .hsk-reading-story-cta:hover,
.hsk-reading-story-link.is-premium:focus-visible .hsk-reading-story-cta {
    border-color: #6b7280;
    background: linear-gradient(180deg, #d1d5db, #9ca3af);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.15);
}

.hsk-reading-story-progress {
    display: grid;
    grid-column: 1 / -1;
    gap: 4px;
    width: 100%;
    min-width: 0;
}

.hsk-reading-story-progress-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    color: #64748b;
    font-size: 10px;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
}

.hsk-reading-story-progress-top strong {
    flex: 0 0 auto;
    color: #166534;
    font-size: 10px;
    font-weight: 900;
    font-variant-numeric: tabular-nums;
}

.hsk-reading-story-progress-track {
    height: 7px;
    border: 1px solid #bbf7d0;
    border-radius: 999px;
    background: #e5e7eb;
    overflow: hidden;
}

.hsk-reading-story-progress-fill {
    display: block;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #16a34a, #22c55e);
    transition: width 0.24s ease;
}

.hsk-reading-story-progress.is-complete .hsk-reading-story-progress-fill {
    background: linear-gradient(90deg, #f59e0b, #22c55e);
}

body[data-learning-page="story-reader"] .learning-page-main {
    grid-template-columns: minmax(190px, 220px) minmax(680px, 1fr) minmax(210px, 235px);
    gap: clamp(14px, 1.6vw, 20px);
}

@media (max-width: 820px) {
    body[data-learning-page="story-reader"] .learning-page-main {
        grid-template-columns: minmax(0, 1fr);
    }
}

body[data-learning-page="story-reader"] .learning-page-content {
    border-color: #94a3b8;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
}

.story-reader-shell {
    display: grid;
    gap: 18px;
    width: 100%;
    max-width: 100%;
    min-width: 0;
}

.story-reader-page-header {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 16px;
    align-items: start;
    margin-bottom: 4px;
    padding-bottom: 16px;
    border-bottom: 4px solid #9ca3af;
}

.story-reader-header-progress {
    position: absolute;
    right: 0;
    bottom: 4px;
    z-index: 1;
    width: 250px;
    max-width: 50vw;
    pointer-events: none;
}

.story-reader-word-goal-panel {
    display: grid;
    gap: 4px;
    width: 100%;
}

.story-reader-word-goal-header {
    display: flex;
    justify-content: flex-end;
    min-height: 10px;
}

.story-reader-word-goal-count {
    color: #166534;
    font-size: 11px;
    font-weight: 900;
    font-variant-numeric: tabular-nums;
    line-height: 1;
}

.story-reader-word-goal-track {
    height: 10px;
    border: 1px solid #bbf7d0;
    border-radius: 999px;
    background: #e5e7eb;
    overflow: hidden;
}

.story-reader-word-goal-fill {
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #16a34a, #22c55e);
    transition: width 0.24s ease;
}

.story-reader-word-goal-panel.is-complete .story-reader-word-goal-fill {
    background: linear-gradient(90deg, #f59e0b, #22c55e);
}

.story-reader-word-goal-note {
    margin: 0;
    color: #166534;
    font-size: 10px;
    font-weight: 900;
    line-height: 1.05;
    text-align: right;
}

.story-reader-title-copy {
    min-width: 0;
}

.story-reader-title {
    margin: 0;
    color: var(--purple-dark);
    font-size: clamp(34px, 5vw, 56px);
    line-height: 0.98;
}

.story-reader-meta {
    max-width: 860px;
    margin: 12px 0 0;
    color: var(--muted);
    font-size: 15px;
    font-weight: 800;
    line-height: 1.55;
}

.story-reader-line-count {
    display: inline-flex;
    align-items: center;
    min-height: 26px;
    margin: 12px 0 0;
    padding: 5px 9px;
    border: 1px solid #bbf7d0;
    border-radius: 8px;
    background: #f0fdf4;
    color: #166534;
    font-size: 11px;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
}

.story-reader-status {
    margin-top: 10px;
    color: #475569;
}

.story-reader-back {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 92px;
    min-height: 42px;
    padding: 10px 14px;
    border: 1px solid #15803d;
    border-radius: 8px;
    background: linear-gradient(180deg, #22c55e, #16a34a);
    color: #ffffff;
    font-size: 13px;
    font-weight: 900;
    line-height: 1;
    text-decoration: none;
    overflow: hidden;
    transform: translateY(0) scale(1);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        background 0.16s ease,
        border-color 0.16s ease;
}

.story-reader-back::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.45), transparent);
    pointer-events: none;
    transition: left 0.4s ease;
}

.story-reader-back:hover,
.story-reader-back:focus-visible {
    border-color: #166534;
    background: linear-gradient(180deg, #16a34a, #15803d);
    box-shadow: 0 8px 18px rgba(22, 163, 74, 0.22);
    outline: none;
    transform: translateY(-2px) scale(1.01);
}

.story-reader-back:hover::after,
.story-reader-back:focus-visible::after {
    left: 140%;
}

.story-reader-content,
.story-reader-lines {
    display: block;
    width: 100%;
    max-width: none;
    min-width: 0;
}

.story-line {
    width: 100%;
    min-height: 0;
    margin: 0;
    padding: clamp(18px, 2.4vw, 28px);
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    color: #0f172a;
    font-size: clamp(20px, 1.7vw, 24px);
    font-weight: 800;
    line-height: 1.9;
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.05);
}

.story-line--passage {
    overflow-wrap: anywhere;
}

.story-line--passage .story-reader-word {
    margin-inline: 0.02em;
}

.story-line:nth-child(4n + 1) {
    border-color: #c4b5fd;
    background: linear-gradient(180deg, #ffffff, #faf5ff);
}

.story-line:nth-child(4n + 2) {
    border-color: #bbf7d0;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.story-line:nth-child(4n + 3) {
    border-color: #bfdbfe;
    background: linear-gradient(180deg, #ffffff, #eff6ff);
}

.story-line:nth-child(4n) {
    border-color: #fed7aa;
    background: linear-gradient(180deg, #ffffff, #fff7ed);
}

.story-reader-word {
    display: inline;
    border-radius: 4px;
    padding: 0 1px;
    background: transparent;
    cursor: pointer;
}

.story-reader-word:hover,
.story-reader-word:focus-visible {
    background: rgba(221, 214, 254, 0.95);
    box-shadow: 0 0 0 1px rgba(124, 58, 237, 0.24);
    outline: none;
}

.story-reader-word.story-reader-word-active,
.story-reader-word.story-reader-word-active:hover,
.story-reader-word.story-reader-word-active:focus-visible {
    background: #fde68a;
    box-shadow:
        0 0 0 2px rgba(245, 158, 11, 0.3),
        inset 0 -0.16em 0 rgba(245, 158, 11, 0.28);
    color: #111827;
    outline: none;
}

.story-reader-tooltip {
    position: fixed;
    z-index: 2147483647;
    box-sizing: border-box;
    max-width: 310px;
    padding: 14px;
    padding-top: 20px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(250, 245, 255, 0.95)),
        radial-gradient(circle at 50% 0%, rgba(124, 58, 237, 0.14), transparent 46%);
    color: var(--ink);
    box-shadow: 0 18px 44px rgba(124, 58, 237, 0.22);
    font-family: Arial, sans-serif;
    font-size: 13px;
    line-height: 1.4;
    pointer-events: auto;
}

.story-reader-tooltip-pinned {
    box-shadow: 0 20px 52px rgba(124, 58, 237, 0.3);
}

.story-reader-tooltip > button.story-reader-tooltip-close {
    position: absolute;
    inset: auto 0 auto auto;
    top: 0;
    right: 0;
    bottom: auto;
    left: auto;
    z-index: 3;
    display: grid;
    place-items: center;
    width: 28px;
    height: 28px;
    margin: 0;
    padding: 0;
    border: 0;
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    border-radius: 0 10px 0 10px;
    background: #ffffff;
    color: #dc2626;
    box-shadow: none;
    cursor: pointer;
    font: inherit;
    font-size: 20px;
    font-weight: 900;
    line-height: 1;
    transform: none;
    will-change: auto;
}

.story-reader-tooltip > button.story-reader-tooltip-close::after {
    display: none;
    content: none;
}

.story-reader-tooltip > button.story-reader-tooltip-close:not(:disabled):hover,
.story-reader-tooltip > button.story-reader-tooltip-close:not(:disabled):focus-visible,
.story-reader-tooltip > button.story-reader-tooltip-close:not(:disabled):active {
    background: #fef2f2;
    color: #b91c1c;
    box-shadow: none;
    opacity: 1;
    outline: none;
    transform: none;
}

.story-reader-tooltip strong {
    display: block;
    margin-bottom: 5px;
    padding-right: 28px;
    color: var(--purple-dark);
    font-size: 22px;
    font-weight: 900;
}

.story-reader-tooltip-pinyin {
    margin-bottom: 5px;
    color: var(--purple-dark);
    font-weight: 900;
}

.story-reader-tooltip-line,
.story-reader-tooltip-meaning {
    margin-top: 4px;
    color: var(--muted);
    font-weight: 800;
}

.story-reader-tooltip-hsk {
    display: inline-block;
    margin-top: 8px;
    padding: 4px 8px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--purple-light);
    color: var(--purple-dark);
    font-size: 11px;
    font-weight: 900;
    text-transform: uppercase;
}

.story-reader-difficulty-container {
    margin-top: 10px;
    padding: 9px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #ffffff;
}

.story-reader-difficulty-label {
    margin-bottom: 7px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 900;
    line-height: 1.3;
}

.story-reader-difficulty-row {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
}

.story-reader-difficulty {
    min-height: 30px;
    padding: 6px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    background: linear-gradient(180deg, #f8fafc, #e2e8f0);
    color: var(--ink);
    cursor: pointer;
    font: inherit;
    font-size: 11px;
    font-weight: 900;
}

.story-reader-difficulty:hover {
    border-color: var(--border);
    box-shadow: 0 6px 14px rgba(88, 28, 135, 0.12);
}

.story-reader-difficulty-selected {
    border-color: #2563eb;
    background: #eff6ff;
    color: #1d4ed8;
    box-shadow: inset 0 0 0 1px rgba(124, 58, 237, 0.2);
}

.story-reader-difficulty[data-difficulty="easy"].story-reader-difficulty-selected {
    border-color: var(--green);
    background: #dcfce7;
    color: #166534;
}

.story-reader-difficulty[data-difficulty="hard"].story-reader-difficulty-selected {
    border-color: var(--rose);
    background: #ffe4e6;
    color: #9f1239;
}

.story-reader-save-word,
.story-reader-play-word,
.story-reader-explain-word {
    position: relative;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    width: 100%;
    min-height: 44px;
    margin-top: 10px;
    padding: 8px 12px;
    border: 1px solid var(--green);
    border-radius: 8px;
    background: var(--green);
    color: #ffffff;
    cursor: pointer;
    font: inherit;
    font-weight: 900;
    line-height: 1.12;
    overflow: hidden;
    transform: translateY(0) scale(1);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        background 0.16s ease,
        border-color 0.16s ease,
        opacity 0.16s ease;
}

.story-reader-save-word::after,
.story-reader-play-word::after,
.story-reader-explain-word::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 58%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.45), transparent);
    pointer-events: none;
}

.story-reader-save-word:hover,
.story-reader-play-word:hover,
.story-reader-explain-word:hover {
    box-shadow: 0 8px 18px rgba(22, 163, 74, 0.2);
    transform: translateY(-2px) scale(1.01);
}

.story-reader-save-word:disabled {
    cursor: default;
    opacity: 0.92;
    animation: none;
}

.story-reader-play-word {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
}

.story-reader-play-word.is-playing {
    border-color: var(--purple-dark);
    background: var(--purple-dark);
    color: #ffffff;
}

.story-reader-explain-word {
    border-color: var(--purple-dark);
    background: linear-gradient(135deg, var(--purple-dark), #a855f7);
}

.story-reader-explain-word.is-locked {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
}

.story-reader-free-main,
.story-reader-free-cost,
.story-reader-play-main,
.story-reader-play-cost,
.story-reader-explain-main,
.story-reader-explain-cost {
    position: relative;
    z-index: 1;
    display: block;
}

.story-reader-free-cost,
.story-reader-play-cost,
.story-reader-explain-cost {
    font-size: 10px;
    font-weight: 800;
    line-height: 1.1;
    opacity: 0.86;
}

.story-reader-save-status {
    min-height: 16px;
    margin-top: 6px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 900;
}

.story-reader-save-status.is-saved {
    color: var(--green);
}

.story-reader-save-status.is-error {
    color: var(--rose);
}

.story-reader-save-status.is-duplicate,
.story-reader-explain-result {
    color: var(--muted);
}

.story-reader-explain-result a {
    color: var(--purple-dark);
    font-weight: 900;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.story-reader-explain-result a:hover,
.story-reader-explain-result a:focus-visible {
    color: #581c87;
}

.story-reader-loading {
    color: var(--muted);
    font-size: 15px;
    font-weight: 900;
}

.learning-stat-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
    margin-bottom: 18px;
}

.learning-stat-row--read {
    width: min(100%, 360px);
    margin-top: 0;
    margin-bottom: 0;
    padding: 10px;
    border: 2px solid #a855f7;
    border-radius: 12px;
    background: linear-gradient(180deg, #faf5ff, #ffffff);
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-content: start;
}

.learning-stat-row--read .learning-stat::before {
    display: none;
}

.learning-stat--read-1 {
    border-color: #c4b5fd;
    background: linear-gradient(180deg, #ffffff, #faf5ff);
}

.learning-stat--read-2 {
    border-color: #bbf7d0;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.learning-stat--read-3 {
    border-color: #fecdd3;
    background: linear-gradient(180deg, #ffffff, #fef2f2);
}

.learning-stat {
    position: relative;
    display: grid;
    gap: 8px;
    align-content: start;
    justify-items: center;
    text-align: center;
    min-height: 116px;
    padding: 14px;
    border: 1px solid #bae6fd;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f0f9ff);
    box-shadow: 0 12px 28px rgba(14, 165, 233, 0.08);
    overflow: hidden;
}

.learning-stat-row--read .learning-stat {
    min-height: 90px;
    padding: 8px;
}

.learning-stat::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 4px;
    background: #38bdf8;
}

.learning-stat-label {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 0;
}

.learning-stat-icon {
    display: inline-grid;
    place-items: center;
    flex: 0 0 auto;
    width: 34px;
    height: 34px;
    margin-bottom: 6px;
    border-radius: 10px;
    color: #4c1d95;
    background: #ede9fe;
    border: 1px solid #c4b5fd;
    font-size: 18px;
    font-weight: 900;
    line-height: 1;
    box-shadow: 0 8px 16px rgba(15, 23, 42, 0.12);
}

.learning-stat-row--read .learning-stat-icon {
    width: auto;
    height: auto;
    margin-bottom: 2px;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    color: #334155;
}

.learning-stat-label span:last-child {
    color: #334155;
    font-size: 12px;
    font-weight: 900;
    line-height: 1.15;
    text-transform: uppercase;
}

.learning-stat strong {
    display: block;
    align-self: end;
    color: #0f172a;
    font-size: 28px;
    line-height: 1;
}

.learning-stat > span {
    display: block;
    margin-top: 4px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 900;
    text-transform: uppercase;
}

.learning-stat-row--read .learning-stat > span {
    font-size: 10px;
}

.learning-stat-row--read .learning-stat strong {
    font-size: 24px;
}

.learning-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    margin-top: 16px;
    padding: 11px 16px;
    border: 1px solid var(--green);
    border-radius: 8px;
    background: linear-gradient(135deg, var(--green), var(--green-bright));
    color: #ffffff;
    font-size: 14px;
    font-weight: 900;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    transform: translateY(0) scale(1);
    box-shadow: 0 8px 18px rgba(22, 163, 74, 0.18);
    animation: lettersActionBump 2s ease-in-out infinite;
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        background 0.16s ease,
        border-color 0.16s ease;
}

.learning-action::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
    pointer-events: none;
    transition: left 0.4s ease;
}

.learning-action:hover,
.learning-action:focus-visible {
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 10px 24px rgba(22, 163, 74, 0.22);
    outline: none;
}

.learning-action:hover::after,
.learning-action:focus-visible::after {
    left: 140%;
}

.learning-action.secondary {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: #111827;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.1);
}

.leaderboards-locked-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-height: 112px;
    margin-top: 16px;
    padding: 20px;
    border: 2px solid rgba(124, 58, 237, 0.35);
    border-radius: 14px;
    background: #ffffff;
    color: var(--purple-dark);
    box-shadow: 0 12px 28px rgba(124, 58, 237, 0.10);
    text-align: center;
}

.leaderboards-locked-icon {
    display: inline-grid;
    place-items: center;
    width: 46px;
    height: 46px;
    flex: 0 0 auto;
    border: 1px solid rgba(124, 58, 237, 0.24);
    border-radius: 12px;
    background: #f5f3ff;
    font-size: 24px;
    line-height: 1;
}

.leaderboards-locked-box strong {
    font-size: clamp(20px, 3vw, 28px);
    line-height: 1.2;
}

.hsk-flashcard-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.hsk-flashcard-game {
    position: relative;
    display: grid;
    gap: 12px;
    min-width: 0;
    min-height: 370px;
    padding: 14px;
    border: 2px solid #94a3b8;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f1f5f9);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
}

.hsk-flashcard-game.is-flipped {
    border-color: #94a3b8;
    background: linear-gradient(180deg, #ffffff, #f1f5f9);
}

.hsk-flashcard-top {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    align-items: flex-start;
}

.hsk-flashcard-level {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    padding: 4px 8px;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    background: #e5e7eb;
    color: #334155;
    font-size: 11px;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
}

.hsk-flashcard-top h2 {
    margin: 8px 0 0;
    color: var(--purple-dark);
    font-size: 18px;
    line-height: 1.15;
}

.hsk-flashcard-count {
    flex: 0 0 auto;
    color: #64748b;
    font-size: 13px;
    font-weight: 900;
    font-variant-numeric: tabular-nums;
}

.hsk-flashcard-audio {
    position: absolute;
    top: 12px;
    right: 12px;
    inset-block-start: 12px;
    inset-inline-end: 12px;
    margin: 0;
    z-index: 2;
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border: 1px solid #9ca3af;
    border-radius: 8px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    cursor: pointer;
    font: inherit;
    font-size: 18px;
    line-height: 1;
    overflow: hidden;
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.1);
    transform: translateY(0) scale(1);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        opacity 0.16s ease;
}

.hsk-flashcard-card > button.hsk-flashcard-audio {
    position: absolute;
    top: 12px;
    right: 12px;
    inset-block-start: 12px;
    inset-inline-end: 12px;
}

.hsk-flashcard-audio::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 58%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.45), transparent);
    pointer-events: none;
}

.hsk-flashcard-audio:hover:not(:disabled),
.hsk-flashcard-audio:focus-visible:not(:disabled) {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    outline: none;
    box-shadow: 0 8px 18px rgba(88, 28, 135, 0.16);
    transform: translateY(-1px);
}

.hsk-flashcard-audio:active:not(:disabled) {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #d1d5db, #cbd5e1);
    color: var(--ink);
    box-shadow: 0 4px 12px rgba(88, 28, 135, 0.12);
    transform: translateY(0) scale(0.985);
}

.hsk-flashcard-audio:disabled {
    cursor: default;
    opacity: 0.96;
}

.hsk-flashcard-audio.is-playing {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
}

.hsk-flashcard-sound-icon,
.hsk-flashcard-wave-icon {
    position: relative;
    z-index: 1;
}

.hsk-flashcard-wave-icon {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 3px;
    width: 22px;
    height: 22px;
}

.hsk-flashcard-wave-icon span {
    display: block;
    width: 4px;
    height: 11px;
    border-radius: 999px;
    background: currentColor;
    animation: hskAudioWave 0.68s ease-in-out infinite;
}

.hsk-flashcard-wave-icon span:nth-child(2) {
    height: 18px;
    animation-delay: 0.1s;
}

.hsk-flashcard-wave-icon span:nth-child(3) {
    height: 13px;
    animation-delay: 0.2s;
}

.hsk-flashcard-audio.is-playing .hsk-flashcard-sound-icon {
    display: none;
}

.hsk-flashcard-audio.is-playing .hsk-flashcard-wave-icon {
    display: inline-flex;
}

.hsk-flashcard-card {
    position: relative;
    display: grid;
    isolation: isolate;
    width: 100%;
    min-height: 178px;
    border: 2px solid #9ca3af;
    border-radius: 10px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    backface-visibility: hidden;
    transform-style: preserve-3d;
    will-change: transform, opacity;
    transition:
        border-color 0.16s ease,
        box-shadow 0.16s ease,
        transform 0.16s cubic-bezier(.2, .8, .2, 1);
}

.hsk-flashcard-card:hover,
.hsk-flashcard-card:focus-within {
    border-color: #9ca3af;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.12);
    outline: none;
    transform: none;
}

.hsk-flashcard-flip-area {
    position: relative;
    display: grid;
    grid-template-rows: minmax(0, 1fr) 64px;
    place-items: center;
    gap: 6px;
    width: 100%;
    min-height: 174px;
    padding: 28px 14px 14px;
    border: 0;
    background: transparent;
    color: inherit;
    cursor: pointer;
    font: inherit;
    text-align: center;
}

.hsk-flashcard-flip-area:focus-visible {
    outline: none;
}

body[data-learning-page="flashcards"] button.hsk-flashcard-flip-area {
    transform: none;
    transition: none;
}

body[data-learning-page="flashcards"] button.hsk-flashcard-flip-area::after {
    display: none;
}

body[data-learning-page="flashcards"] button.hsk-flashcard-flip-area:hover:not(:disabled),
body[data-learning-page="flashcards"] button.hsk-flashcard-flip-area:focus-visible:not(:disabled),
body[data-learning-page="flashcards"] button.hsk-flashcard-flip-area:active:not(:disabled) {
    background: transparent;
    color: inherit;
    box-shadow: none;
    transform: none;
}

.hsk-flashcard-game.is-answering .hsk-flashcard-card {
    pointer-events: none;
}

.hsk-flashcard-game.is-correct-answer .hsk-flashcard-card {
    border-color: #16a34a;
    background: linear-gradient(180deg, #f0fdf4, #dcfce7);
    box-shadow:
        0 0 0 3px rgba(34, 197, 94, 0.16),
        0 10px 22px rgba(15, 23, 42, 0.10);
    animation: hskFlashcardCorrectLift 1000ms cubic-bezier(.2, .8, .2, 1) both;
}

.hsk-flashcard-game.is-flipping-out .hsk-flashcard-card {
    animation: hskFlashcardFlipOut 260ms cubic-bezier(.4, 0, .2, 1) forwards;
}

.hsk-flashcard-game.is-flipping-in .hsk-flashcard-card {
    animation: hskFlashcardFlipIn 360ms cubic-bezier(.2, .8, .2, 1) both;
}

.hsk-flashcard-hanzi {
    display: grid;
    place-items: center;
    width: min(170px, 100%);
    min-height: clamp(70px, 8vw, 96px);
    padding: 10px 14px;
    border: 1px solid #cbd5e1;
    border-radius: 12px;
    background: #ffffff;
    color: #0f172a;
    font-size: clamp(36px, 5vw, 62px);
    font-weight: 900;
    line-height: 1;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.72);
}

.hsk-flashcard-pinyin {
    display: block;
    color: #475569;
    font-size: 15px;
    font-weight: 900;
    line-height: 1.2;
}

.hsk-flashcard-meaning {
    display: block;
    color: #166534;
    font-size: 14px;
    font-weight: 900;
    line-height: 1.25;
}

.hsk-flashcard-detail-stack {
    position: relative;
    display: grid;
    grid-template-rows: 24px 34px;
    place-items: center;
    align-self: end;
    width: 100%;
    height: 58px;
    min-height: 58px;
    overflow: hidden;
}

.hsk-flashcard-hint {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: end center;
    color: #475569;
    font-size: 15px;
    font-weight: 900;
    line-height: 1.2;
    min-height: 24px;
}

.hsk-flashcard-pinyin.is-hidden,
.hsk-flashcard-meaning.is-hidden,
.hsk-flashcard-hint.is-hidden {
    visibility: hidden;
}

.hsk-flashcard-choice-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    justify-self: center;
    width: min(520px, 100%);
    gap: 8px;
}

.hsk-flashcard-choice {
    display: grid;
    gap: 3px;
    align-content: center;
    width: 100%;
    min-height: 66px;
    margin-top: 0;
    padding: 10px 12px;
    border: 2px solid #22c55e;
    border-radius: 8px;
    background: #f8fafc;
    color: var(--ink);
    cursor: pointer;
    font: inherit;
    font-size: 16px;
    font-weight: 900;
    line-height: 1.2;
    position: relative;
    overflow: hidden;
    text-align: center;
    transform: translateY(0) scale(1);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        background 0.16s ease,
        border-color 0.16s ease,
        color 0.16s ease,
        opacity 0.16s ease;
}

.hsk-flashcard-choice::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
    pointer-events: none;
    transition: left 0.4s ease;
}

.hsk-flashcard-choice:hover:not(:disabled),
.hsk-flashcard-choice:focus-visible:not(:disabled) {
    border-color: #22c55e;
    background: #f8fafc;
    color: var(--ink);
    opacity: 1;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.14);
    outline: none;
    transform: translateY(-2px) scale(1.01);
}

.hsk-flashcard-choice:hover:not(:disabled)::after,
.hsk-flashcard-choice:focus-visible:not(:disabled)::after {
    left: 140%;
}

.hsk-flashcard-choice:active {
    border-color: #22c55e;
    background: #f8fafc;
    color: var(--ink);
    opacity: 1;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.12);
    transform: translateY(0) scale(0.985);
}

body[data-learning-page="flashcards"] button.hsk-flashcard-audio:hover:not(:disabled),
body[data-learning-page="flashcards"] button.hsk-flashcard-audio:focus-visible:not(:disabled),
body[data-learning-page="flashcards"] button.hsk-flashcard-audio:active:not(:disabled) {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
}

body[data-learning-page="flashcards"] button.hsk-flashcard-choice:hover:not(:disabled),
body[data-learning-page="flashcards"] button.hsk-flashcard-choice:focus-visible:not(:disabled),
body[data-learning-page="flashcards"] button.hsk-flashcard-choice:active:not(:disabled) {
    border-color: #22c55e;
    background: #f8fafc;
    color: var(--ink);
    opacity: 1;
}

body[data-learning-page="flashcards"] button.hsk-flashcard-audio:hover:not(:disabled),
body[data-learning-page="flashcards"] button.hsk-flashcard-audio:focus-visible:not(:disabled),
body[data-learning-page="flashcards"] button.hsk-flashcard-audio:active:not(:disabled) {
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.1);
}

body[data-learning-page="flashcards"] button.hsk-flashcard-choice:hover:not(:disabled),
body[data-learning-page="flashcards"] button.hsk-flashcard-choice:focus-visible:not(:disabled) {
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.14);
}

body[data-learning-page="flashcards"] button.hsk-flashcard-choice:active:not(:disabled) {
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.12);
}

.hsk-flashcard-choice.is-selected,
.hsk-flashcard-choice.is-selected:disabled,
.hsk-flashcard-choice.is-selected:hover,
.hsk-flashcard-choice.is-selected:focus-visible,
body[data-learning-page="flashcards"] button.hsk-flashcard-choice.is-selected,
body[data-learning-page="flashcards"] button.hsk-flashcard-choice.is-selected:disabled,
body[data-learning-page="flashcards"] button.hsk-flashcard-choice.is-selected:hover,
body[data-learning-page="flashcards"] button.hsk-flashcard-choice.is-selected:focus-visible,
body[data-learning-page="flashcards"] button.hsk-flashcard-choice.is-selected:active {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    opacity: 1;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.12);
    transition: none;
}

.hsk-flashcard-choice:disabled {
    cursor: default;
}

.hsk-flashcard-choice.is-correct,
.hsk-flashcard-choice.is-correct:hover,
.hsk-flashcard-choice.is-correct:focus-visible {
    border-color: #16a34a;
    background: linear-gradient(180deg, #dcfce7, #bbf7d0);
    color: #166534;
    opacity: 1;
    box-shadow: 0 10px 24px rgba(22, 163, 74, 0.18);
}

.hsk-flashcard-choice.is-wrong,
.hsk-flashcard-choice.is-wrong:hover,
.hsk-flashcard-choice.is-wrong:focus-visible {
    border-color: #dc2626;
    background: linear-gradient(180deg, #fee2e2, #fecaca);
    color: #991b1b;
    opacity: 1;
    box-shadow: 0 10px 24px rgba(220, 38, 38, 0.14);
    animation: learningChoiceWrongShake 360ms ease;
}

.hsk-flashcard-choice.is-selected-correct {
    overflow: visible;
    animation: learningChoiceCorrectLift 920ms cubic-bezier(.2, .8, .2, 1) both;
}

.hsk-flashcard-choice.is-selected-correct::before {
    content: "";
    position: absolute;
    inset: -18px;
    z-index: 2;
    border-radius: 14px;
    background:
        radial-gradient(circle, #22c55e 0 2px, transparent 3px) 50% 0 / 8px 8px no-repeat,
        radial-gradient(circle, #86efac 0 2px, transparent 3px) 100% 50% / 8px 8px no-repeat,
        radial-gradient(circle, #f59e0b 0 2px, transparent 3px) 50% 100% / 8px 8px no-repeat,
        radial-gradient(circle, #06b6d4 0 2px, transparent 3px) 0 50% / 8px 8px no-repeat,
        radial-gradient(circle, #16a34a 0 2px, transparent 3px) 86% 14% / 8px 8px no-repeat,
        radial-gradient(circle, #a855f7 0 2px, transparent 3px) 14% 86% / 8px 8px no-repeat;
    pointer-events: none;
    animation: learningChoiceButtonFirework 760ms ease-out both;
}

.hsk-flashcard-corner-firework {
    position: absolute;
    z-index: 4;
    width: 78px;
    height: 78px;
    opacity: 0;
    pointer-events: none;
    background:
        radial-gradient(circle, #22c55e 0 3px, transparent 4px) 50% 0 / 8px 8px no-repeat,
        radial-gradient(circle, #f59e0b 0 3px, transparent 4px) 88% 22% / 8px 8px no-repeat,
        radial-gradient(circle, #2563eb 0 3px, transparent 4px) 100% 58% / 8px 8px no-repeat,
        radial-gradient(circle, #a855f7 0 3px, transparent 4px) 66% 94% / 8px 8px no-repeat,
        radial-gradient(circle, #16a34a 0 3px, transparent 4px) 22% 88% / 8px 8px no-repeat,
        radial-gradient(circle, #ef4444 0 3px, transparent 4px) 0 44% / 8px 8px no-repeat;
    transform: translate(var(--firework-x, 0), var(--firework-y, 0)) scale(0.2);
    transform-origin: center;
}

.hsk-flashcard-corner-firework::before,
.hsk-flashcard-corner-firework::after {
    content: "";
    position: absolute;
    inset: 35px;
    border-radius: 999px;
    background: currentColor;
    color: #22c55e;
    box-shadow:
        0 -24px 0 #22c55e,
        18px -18px 0 #f59e0b,
        26px 0 0 #2563eb,
        18px 18px 0 #a855f7,
        0 26px 0 #16a34a,
        -18px 18px 0 #ef4444,
        -26px 0 0 #06b6d4,
        -18px -18px 0 #84cc16;
}

.hsk-flashcard-corner-firework::after {
    transform: rotate(22deg) scale(0.72);
    opacity: 0.8;
}

.hsk-flashcard-corner-firework-tl {
    top: -28px;
    left: -28px;
    --firework-x: -18px;
    --firework-y: -18px;
}

.hsk-flashcard-corner-firework-tr {
    top: -28px;
    right: -28px;
    --firework-x: 18px;
    --firework-y: -18px;
}

.hsk-flashcard-corner-firework-br {
    right: -28px;
    bottom: -28px;
    --firework-x: 18px;
    --firework-y: 18px;
}

.hsk-flashcard-corner-firework-bl {
    bottom: -28px;
    left: -28px;
    --firework-x: -18px;
    --firework-y: 18px;
}

.hsk-flashcard-game.is-correct-answer .hsk-flashcard-corner-firework {
    animation: hskFlashcardCornerFirework 980ms ease-out both;
}

.hsk-flashcard-game.is-correct-answer .hsk-flashcard-corner-firework-tr {
    animation-delay: 70ms;
}

.hsk-flashcard-game.is-correct-answer .hsk-flashcard-corner-firework-br {
    animation-delay: 140ms;
}

.hsk-flashcard-game.is-correct-answer .hsk-flashcard-corner-firework-bl {
    animation-delay: 210ms;
}

.hsk-flashcard-progress {
    display: grid;
    gap: 8px;
    padding: 10px 12px;
    min-height: 54px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.72);
}

.hsk-flashcard-progress-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    color: #475569;
    font-size: 12px;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
}

.hsk-flashcard-progress-header strong {
    color: #0f172a;
    font-size: 12px;
    white-space: nowrap;
}

.hsk-flashcard-progress-track {
    position: relative;
    height: 10px;
    border: 1px solid #c4b5fd;
    border-radius: 999px;
    background: #eef2f7;
    overflow: visible;
}

.hsk-flashcard-progress-fill {
    position: relative;
    z-index: 1;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #16a34a, #22c55e);
    transition: width 0.28s ease;
}

.hsk-flashcard-progress-thumb {
    position: absolute;
    z-index: 2;
    top: 50%;
    left: 0;
    width: 18px;
    height: 18px;
    border: 2px solid #ffffff;
    border-radius: 999px;
    background: #16a34a;
    box-shadow: 0 4px 10px rgba(22, 163, 74, 0.24);
    transform: translate(-50%, -50%);
    transition: left 0.28s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.hsk-flashcard-progress.is-complete {
    border-color: #86efac;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.hsk-flashcard-progress.is-complete .hsk-flashcard-progress-header strong {
    color: #166534;
}

.hsk-flashcard-progress.is-complete .hsk-flashcard-progress-thumb {
    background: #22c55e;
    box-shadow: 0 0 0 5px rgba(34, 197, 94, 0.16);
}

@keyframes hskFlashcardCorrectLift {
    0% {
        transform: translateY(0) scale(1);
    }
    36% {
        transform: translateY(-8px) scale(1.018);
    }
    64% {
        transform: translateY(-3px) scale(1.006);
    }
    100% {
        transform: translateY(0) scale(1);
    }
}

@keyframes hskFlashcardCornerFirework {
    0% {
        opacity: 0;
        transform: translate(0, 0) scale(0.15) rotate(0deg);
    }
    18% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translate(var(--firework-x, 0), var(--firework-y, 0)) scale(1.18) rotate(26deg);
    }
}

@keyframes hskFlashcardFlipOut {
    0% {
        opacity: 1;
        transform: perspective(720px) rotateY(0deg) scale(1);
    }
    100% {
        opacity: 0.15;
        transform: perspective(720px) rotateY(86deg) scale(0.96);
    }
}

@keyframes hskFlashcardFlipIn {
    0% {
        opacity: 0.15;
        transform: perspective(720px) rotateY(-86deg) scale(0.96);
    }
    100% {
        opacity: 1;
        transform: perspective(720px) rotateY(0deg) scale(1);
    }
}

@keyframes hskAudioWave {
    0%, 100% {
        opacity: 0.55;
        transform: scaleY(0.68);
    }
    50% {
        opacity: 1;
        transform: scaleY(1);
    }
}

.achievement-empty-panel,
.sprint-sync-panel {
    margin-top: 18px;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #ffffff;
}

.sprint-sync-panel {
    position: relative;
    isolation: isolate;
    min-height: 262px;
    padding: 14px;
    overflow: hidden;
    border: 0;
    box-shadow: 0 12px 26px rgba(22, 163, 74, 0.15);
}

.sprint-sync-panel::before {
    content: "";
    position: absolute;
    z-index: 0;
    inset: -80%;
    background: conic-gradient(
        from 0deg,
        rgba(22, 163, 74, 0.18),
        #22c55e,
        #bbf7d0,
        #16a34a,
        rgba(22, 163, 74, 0.18)
    );
    animation: crp-sprint-outline 3.2s linear infinite;
}

.sprint-sync-panel::after {
    content: "";
    position: absolute;
    z-index: 0;
    inset: 2px;
    border-radius: 6px;
    background: linear-gradient(180deg, #ffffff 0%, #f0fdf4 100%);
}

.sprint-sync-panel > * {
    position: relative;
    z-index: 1;
}

.sprint-sync-panel > .sprint-countdown-line,
.sprint-sync-panel > .sprint-challenge-stage {
    animation: crp-sprint-content-in 620ms ease forwards;
}

.achievement-empty-panel strong,
.sprint-sync-panel h2 {
    display: block;
    margin: 0 0 8px;
    color: var(--purple-dark);
    font-size: 20px;
    font-weight: 900;
}

.achievement-empty-panel p,
.sprint-sync-panel p {
    margin: 0;
    color: #374151;
    font-size: 14px;
    line-height: 1.55;
}

.sprint-countdown-line,
.sprint-progress-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.sprint-countdown-line {
    color: #166534;
    font-size: 11px;
    font-weight: 900;
    text-transform: uppercase;
}

.sprint-countdown-line strong {
    min-width: 82px;
    color: #14532d;
    font-size: 17px;
    font-variant-numeric: tabular-nums;
    line-height: 1;
    text-align: right;
}

.sprint-challenge-stage {
    min-width: 0;
}

.sprint-challenge-stage.is-sliding-in {
    animation: crp-sprint-stage-in 260ms cubic-bezier(.2, .8, .2, 1);
}

.sprint-copy {
    display: grid;
    gap: 3px;
    margin-top: 10px;
}

.sprint-copy strong {
    color: var(--ink);
    font-size: 14px;
    font-weight: 900;
}

.sprint-copy span {
    min-height: 32px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    line-height: 1.3;
}

.sprint-progress-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 12px;
}

.sprint-progress-item {
    min-width: 0;
}

.sprint-progress-top {
    min-height: 28px;
    align-items: flex-start;
    color: var(--muted);
    font-size: 11px;
    font-weight: 900;
}

.sprint-progress-top span:last-child {
    flex: 0 0 auto;
    color: #166534;
    font-variant-numeric: tabular-nums;
}

.sprint-track {
    height: 8px;
    margin-top: 6px;
    border: 1px solid #86efac;
    border-radius: 999px;
    background: #dcfce7;
    box-shadow: inset 0 0 0 1px rgba(20, 83, 45, 0.12);
    overflow: hidden;
}

.sprint-fill {
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #16a34a, #22c55e);
    transition: width 0.24s ease;
}

.sprint-reward-text {
    display: block;
    min-height: 36px;
    margin-top: 12px;
    padding: 8px 12px;
    border-radius: 999px;
    background: #ecfdf5;
    color: #166534;
    font-size: 20px;
    font-weight: 900;
    line-height: 1;
    text-align: center;
}

.sprint-next-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 40px;
    margin-top: 8px;
    padding: 10px 14px;
    border: 1px solid #15803d;
    border-radius: 8px;
    background: #16a34a;
    color: #ffffff;
    cursor: pointer;
    font: inherit;
    font-size: 13px;
    font-weight: 900;
    box-shadow: 0 8px 18px rgba(22, 163, 74, 0.18);
    transition:
        background 0.16s ease,
        border-color 0.16s ease,
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease;
}

.sprint-next-button:hover,
.sprint-next-button:focus-visible {
    border-color: #166534;
    background: #15803d;
    box-shadow: 0 10px 20px rgba(21, 128, 61, 0.16);
    outline: none;
    transform: translateY(-1px);
}

.sprint-next-button:disabled {
    cursor: wait;
    opacity: 0.72;
    transform: none;
}

@keyframes crp-sprint-outline {
    to {
        transform: rotate(1turn);
    }
}

@keyframes crp-sprint-content-in {
    0% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

@keyframes crp-sprint-stage-in {
    0% {
        opacity: 0;
        transform: translateX(22px);
    }

    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

.sprint-task-list {
    display: grid;
    gap: 12px;
    margin-top: 16px;
}

.sprint-task-row {
    display: grid;
    gap: 7px;
}

.sprint-task-copy {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 900;
}

.sprint-task-copy strong {
    color: var(--ink);
}

.sprint-task-track {
    height: 10px;
    border: 1px solid #86efac;
    border-radius: 999px;
    background: #dcfce7;
    overflow: hidden;
}

.sprint-task-fill {
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #16a34a, #22c55e);
}

.daily-goal-panel {
    display: grid;
    gap: 12px;
    min-height: 150px;
    margin-top: 18px;
    padding: 18px;
    border: 2px solid #94a3b8;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f1f5f9);
    box-shadow: 0 12px 26px rgba(15, 23, 42, 0.08);
}

.daily-goal-countdown {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: -18px -18px 2px;
    padding: 9px 12px;
    border-bottom: 1px solid #cbd5e1;
    border-radius: 10px 10px 0 0;
    background: linear-gradient(180deg, #f8fafc, #eef2ff);
    color: #475569;
    font-size: 12px;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
}

.daily-goal-countdown strong {
    color: #111827;
    font-size: 15px;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0;
    white-space: nowrap;
}

.crp-floating-xp {
    position: fixed !important;
    z-index: 2147483647 !important;
    pointer-events: none;
    transform: translateX(-50%);
    border: 1px solid #c4b5fd !important;
    border-radius: 999px;
    background: linear-gradient(180deg, #faf5ff, #ede9fe) !important;
    color: #6d28d9 !important;
    box-shadow: 0 14px 30px rgba(109, 40, 217, 0.34), 0 0 0 3px rgba(124, 58, 237, 0.12) !important;
    padding: 7px 11px;
    font-family: Arial, sans-serif !important;
    font-size: 14px;
    font-weight: 900;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.7);
    animation: crp-xp-float 1500ms ease-out forwards;
}

@keyframes crp-xp-float {
    0% {
        opacity: 0;
        transform: translate(-50%, 8px) scale(0.92);
    }
    15% {
        opacity: 1;
        transform: translate(-50%, 0) scale(1);
    }
    78% {
        opacity: 1;
        transform: translate(-50%, -24px) scale(1.04);
    }
    100% {
        opacity: 0;
        transform: translate(-50%, -38px) scale(0.96);
    }
}

.daily-goal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

.daily-goal-header > div {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.daily-goal-icon {
    display: inline-grid;
    place-items: center;
    flex: 0 0 auto;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: linear-gradient(180deg, #16a34a, #2563eb);
    color: #ffffff;
    font-size: 20px;
    font-weight: 900;
    box-shadow: 0 8px 18px rgba(109, 40, 217, 0.2);
}

.daily-goal-panel h2 {
    margin: 0;
    color: var(--purple-dark);
    font-size: 20px;
    font-weight: 900;
}

.daily-goal-header strong {
    flex: 0 0 auto;
    color: #64748b;
    font-size: 22px;
    font-variant-numeric: tabular-nums;
}

.daily-goal-panel p {
    margin: 0;
    color: #475569;
    font-size: 14px;
    font-weight: 800;
    line-height: 1.4;
}

.daily-goal-track {
    position: relative;
    height: 12px;
    margin-right: 26px;
    border: 1px solid #cbd5e1;
    border-radius: 999px;
    background: #e5e7eb;
    overflow: visible;
    box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.08);
}

.daily-goal-fill {
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #16a34a, #2563eb);
    transition: width 0.24s ease;
}

.daily-goal-target {
    position: absolute;
    right: 0;
    top: 50%;
    z-index: 2;
    display: inline-grid;
    place-items: center;
    width: 52px;
    height: 52px;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: inherit;
    font-size: 38px;
    font-weight: 900;
    line-height: 1;
    box-shadow: none;
    transform: translate(50%, calc(-50% - 2mm));
}

.learning-side-panel .daily-goal-panel {
    min-height: 0;
    margin-top: 0;
    padding: 12px;
    gap: 8px;
    border-radius: 10px;
    transform: translateY(0);
    transition: transform 0.16s cubic-bezier(.2, .8, .2, 1), box-shadow 0.16s ease, border-color 0.16s ease;
}

.learning-side-panel .daily-goal-countdown {
    margin: -12px -12px 0;
    padding: 7px 9px;
    gap: 6px;
    border-radius: 8px 8px 0 0;
    font-size: 10px;
}

.learning-side-panel .daily-goal-countdown strong {
    font-size: 12px;
}

.learning-side-panel .daily-goal-panel:hover,
.learning-side-panel .daily-goal-panel:focus-within {
    border-color: #7c3aed;
    box-shadow: 0 14px 28px rgba(88, 28, 135, 0.14);
    transform: translateY(-3px);
}

.learning-side-panel .daily-goal-header {
    gap: 8px;
}

.learning-side-panel .daily-goal-header > div {
    gap: 8px;
}

.learning-side-panel .daily-goal-icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    font-size: 15px;
}

.learning-side-panel .daily-goal-panel h2 {
    font-size: 15px;
}

.learning-side-panel .daily-goal-header strong {
    font-size: 14px;
}

.learning-side-panel .daily-goal-panel p {
    display: none;
}

.learning-side-panel .daily-goal-track {
    height: 8px;
    margin-right: 18px;
}

.learning-side-panel .daily-goal-target {
    width: 34px;
    height: 34px;
    font-size: 26px;
}

.achievement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    margin-top: 18px;
}

.achievement-card {
    position: relative;
    display: grid;
    align-content: start;
    gap: 10px;
    min-height: 172px;
    padding: 16px;
    border: 1px solid #bae6fd;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f0f9ff);
    overflow: hidden;
    transform: translateY(0);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        border-color 0.16s ease;
    will-change: transform;
}

.achievement-card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 4px;
    background: #38bdf8;
}

.achievement-card:nth-child(4n + 1) {
    border-color: #fde68a;
    background: linear-gradient(180deg, #ffffff, #fffbeb);
}

.achievement-card:nth-child(4n + 1)::before {
    background: #f59e0b;
}

.achievement-card:nth-child(4n + 2) {
    border-color: #a7f3d0;
    background: linear-gradient(180deg, #ffffff, #ecfdf5);
}

.achievement-card:nth-child(4n + 2)::before {
    background: #10b981;
}

.achievement-card:nth-child(4n + 3) {
    border-color: #bfdbfe;
    background: linear-gradient(180deg, #ffffff, #eff6ff);
}

.achievement-card:nth-child(4n + 3)::before {
    background: #2563eb;
}

.achievement-card:nth-child(4n) {
    border-color: #fecdd3;
    background: linear-gradient(180deg, #ffffff, #fff1f2);
}

.achievement-card:nth-child(4n)::before {
    background: #e11d48;
}

.achievement-card.is-locked {
    border-color: #cbd5e1;
    background: linear-gradient(180deg, #f8fafc, #e5e7eb);
}

.achievement-card.is-locked::before {
    background: #94a3b8;
}

.achievement-card.is-in-progress {
    border-color: #fdba74;
    background: linear-gradient(180deg, #ffffff, #fff7ed);
}

.achievement-card.is-in-progress::before {
    background: linear-gradient(90deg, #f97316, #fb923c);
}

.achievement-card.is-complete,
.achievement-card.is-unlocked {
    border-color: #86efac;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.achievement-card.is-complete::before,
.achievement-card.is-unlocked::before {
    background: linear-gradient(90deg, #16a34a, #22c55e);
}

.achievement-card:hover,
.achievement-card:focus-within {
    border-color: #60a5fa;
    box-shadow: 0 18px 36px rgba(37, 99, 235, 0.13);
    transform: translateY(-5px);
}

.achievement-card.is-locked:hover,
.achievement-card.is-locked:focus-within {
    border-color: #94a3b8;
    box-shadow: 0 18px 36px rgba(100, 116, 139, 0.13);
}

.achievement-card.is-in-progress:hover,
.achievement-card.is-in-progress:focus-within {
    border-color: #fb923c;
    box-shadow: 0 18px 36px rgba(249, 115, 22, 0.15);
}

.achievement-card.is-complete:hover,
.achievement-card.is-complete:focus-within {
    border-color: #22c55e;
    box-shadow: 0 18px 36px rgba(34, 197, 94, 0.15);
}

.achievement-card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
}

.achievement-card strong {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #0f172a;
    font-size: 16px;
    line-height: 1.2;
}

.achievement-state-icon {
    display: inline-grid;
    place-items: center;
    flex: 0 0 auto;
    width: 24px;
    height: 24px;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    background: #f1f5f9;
    color: #475569;
    font-size: 12px;
    font-weight: 900;
}

.achievement-card.is-complete .achievement-state-icon {
    border-color: #86efac;
    background: #dcfce7;
    color: #166534;
}

.achievement-card.is-in-progress .achievement-state-icon {
    border-color: #fdba74;
    background: #ffedd5;
    color: #9a3412;
}

.achievement-card-top > span {
    flex: 0 0 auto;
    border: 1px solid #cbd5e1;
    border-radius: 999px;
    padding: 4px 8px;
    background: #f8fafc;
    color: var(--muted);
    font-size: 10px;
    font-weight: 900;
    text-transform: uppercase;
}

.achievement-card.is-complete .achievement-card-top > span,
.achievement-card.is-unlocked .achievement-card-top > span {
    border-color: #86efac;
    background: #dcfce7;
    color: #166534;
}

.achievement-card.is-in-progress .achievement-card-top > span {
    border-color: #fdba74;
    background: #ffedd5;
    color: #9a3412;
}

.achievement-progress {
    display: grid;
    gap: 6px;
    align-self: end;
    width: 100%;
    margin-top: auto;
}

.achievement-progress-top {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    color: #64748b;
    font-size: 11px;
    font-weight: 900;
}

.achievement-progress-track {
    height: 9px;
    overflow: hidden;
    border-radius: 999px;
    background: #e5e7eb;
}

.achievement-progress-fill {
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #f97316, #fb923c);
}

.achievement-card.is-locked .achievement-progress-fill {
    background: #94a3b8;
}

.achievement-card.is-complete .achievement-progress-fill,
.achievement-card.is-unlocked .achievement-progress-fill {
    background: linear-gradient(90deg, #16a34a, #22c55e);
}

.achievement-card p {
    margin: 0;
    color: #374151;
    font-size: 13px;
    line-height: 1.45;
}

.achievement-card time {
    color: var(--muted);
    font-size: 11px;
    font-weight: 800;
}

.achievement-share-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-top: 2px;
}

.achievement-share-button {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 34px;
    padding: 7px 11px;
    border: 1px solid #9ca3af;
    border-radius: 8px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: #111827;
    cursor: pointer;
    font: inherit;
    font-size: 12px;
    font-weight: 900;
    line-height: 1;
    overflow: hidden;
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        border-color 0.16s ease,
        opacity 0.16s ease;
}

.achievement-share-button::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.45), transparent);
    pointer-events: none;
    transition: left 0.4s ease;
}

.achievement-share-button:hover,
.achievement-share-button:focus-visible {
    border-color: #6b7280;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.14);
    outline: none;
    transform: translateY(-2px) scale(1.01);
}

.achievement-share-button:hover::after,
.achievement-share-button:focus-visible::after {
    left: 140%;
}

.achievement-share-button:active {
    opacity: 0.85;
    transform: translateY(0) scale(0.985);
}

.achievement-share-button:disabled {
    cursor: wait;
    opacity: 0.72;
    transform: none;
}

.achievement-share-status {
    min-width: 0;
    color: #166534;
    font-size: 11px;
    font-weight: 900;
    line-height: 1.25;
}

.achievement-share-status.is-error {
    color: #b91c1c;
}

.achievement-extra-panel {
    margin-top: 18px;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #ffffff;
}

.achievement-extra-header {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 16px;
    margin-bottom: 12px;
}

.achievement-extra-header .learning-kicker {
    margin: 0;
}

.achievement-extra-header p {
    margin: 0;
    color: var(--muted);
    font-size: 12px;
    font-weight: 900;
}

.weekly-quest-list,
.mastery-badge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
}

.weekly-quest-card,
.mastery-badge-card {
    display: grid;
    align-content: start;
    gap: 10px;
    min-height: 136px;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #ffffff;
}

.weekly-quest-card.is-complete,
.mastery-badge-card.is-unlocked {
    border-color: #86efac;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.weekly-quest-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
}

.weekly-quest-top strong {
    color: var(--purple-dark);
    font-size: 15px;
    line-height: 1.2;
}

.weekly-quest-top span {
    flex: 0 0 auto;
    color: var(--muted);
    font-size: 11px;
    font-weight: 900;
}

.weekly-quest-card p,
.mastery-badge-card p {
    margin: 0;
    color: #374151;
    font-size: 13px;
    line-height: 1.45;
}

.achievement-empty-panel.compact {
    margin: 0;
    min-height: 136px;
}

.compact-action {
    width: 100%;
    min-height: 36px;
    margin-top: 0;
    padding: 9px 12px;
    border-color: #86efac;
    font-size: 12px;
    animation: none;
    box-shadow: none;
}

.compact-action:disabled {
    border-color: #cbd5e1;
    background: #f8fafc;
    color: var(--muted);
    cursor: default;
    transform: none;
}

.compact-action:disabled::after {
    display: none;
}

.letters-drill-shell {
    display: grid;
    gap: 16px;
    margin-top: 22px;
    position: relative;
    overflow: hidden;
    padding: 14px;
    border: 2px solid #cbd5e1;
    border-radius: 16px;
    background: #eef2f7;
    box-shadow: inset 0 0 0 1px #ffffff;
}

.letters-drill-header {
    display: grid;
    grid-template-columns: minmax(300px, 1fr) minmax(240px, 300px);
    gap: 14px;
    align-items: start;
}

.letters-header-controls {
    display: grid;
    gap: 10px;
    align-content: start;
}

.letters-mode-tabs {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
}

.letters-mode-button,
.letters-audio-button,
.letters-play-word,
.letters-primary-button,
.letters-secondary-button,
.letters-choice {
    min-height: 44px;
    border-radius: 8px;
    font-family: inherit;
    font-weight: 900;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transform: translateY(0) scale(1);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        background 0.16s ease,
        border-color 0.16s ease,
        color 0.16s ease,
        opacity 0.16s ease;
}

.letters-mode-button::after,
.letters-audio-button::after,
.letters-primary-button::after,
.letters-secondary-button::after,
.letters-choice::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
    pointer-events: none;
    transition: left 0.4s ease;
}

.letters-mode-button:hover:not(:disabled),
.letters-mode-button:focus-visible:not(:disabled),
.letters-audio-button:hover:not(:disabled),
.letters-audio-button:focus-visible:not(:disabled),
.letters-primary-button:hover:not(:disabled),
.letters-primary-button:focus-visible:not(:disabled),
.letters-secondary-button:hover:not(:disabled),
.letters-secondary-button:focus-visible:not(:disabled),
.letters-choice:hover:not(:disabled),
.letters-choice:focus-visible:not(:disabled) {
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 10px 24px rgba(88, 28, 135, 0.16);
    outline: none;
}

.letters-mode-button:hover:not(:disabled)::after,
.letters-mode-button:focus-visible:not(:disabled)::after,
.letters-audio-button:hover:not(:disabled)::after,
.letters-audio-button:focus-visible:not(:disabled)::after,
.letters-primary-button:hover:not(:disabled)::after,
.letters-primary-button:focus-visible:not(:disabled)::after,
.letters-secondary-button:hover:not(:disabled)::after,
.letters-secondary-button:focus-visible:not(:disabled)::after,
.letters-choice:hover:not(:disabled)::after,
.letters-choice:focus-visible:not(:disabled)::after {
    left: 140%;
}

.letters-mode-button:active:not(:disabled),
.letters-audio-button:active:not(:disabled),
.letters-primary-button:active:not(:disabled),
.letters-secondary-button:active:not(:disabled),
.letters-choice:active:not(:disabled) {
    transform: translateY(0) scale(0.985);
    box-shadow: 0 4px 12px rgba(88, 28, 135, 0.12);
}

.letters-mode-button {
    border: 1px solid #cbd5e1;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    color: #374151;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    line-height: 1.08;
    padding: 6px 5px;
    text-align: center;
    white-space: nowrap;
    overflow-wrap: normal;
}

.letters-mode-button[data-mode="pronunciation"] {
    font-size: 11px;
}

.letters-mode-button[data-mode="hanzi"].is-active {
    border-color: var(--purple);
    background: linear-gradient(135deg, var(--purple), #a855f7);
    color: #ffffff;
}

.letters-mode-button[data-mode="pinyin"].is-active {
    border-color: var(--blue);
    background: linear-gradient(135deg, var(--blue), var(--cyan));
    color: #ffffff;
}

.letters-mode-button[data-mode="listening"].is-active {
    border-color: #d97706;
    background: linear-gradient(135deg, var(--amber), #fbbf24);
    color: #111827;
}

.letters-mode-button[data-mode="pronunciation"].is-active {
    border-color: var(--green);
    background: linear-gradient(135deg, var(--green), var(--green-bright));
    color: #ffffff;
}

.letters-mode-button.is-active {
    box-shadow: 0 8px 18px rgba(124, 58, 237, 0.16);
}

.letters-mode-button[data-mode="pronunciation"].is-active,
.practice-mode-button[data-category="introduction"].is-active {
    box-shadow: 0 8px 18px rgba(22, 163, 74, 0.18);
}

.letters-lesson-progress {
    display: grid;
    gap: 8px;
    padding: 10px 12px;
    min-height: 54px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.72);
}

.letters-lesson-progress-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    color: #475569;
    font-size: 12px;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
}

.letters-lesson-progress-header strong {
    color: #0f172a;
    font-size: 12px;
    white-space: nowrap;
}

.letters-lesson-progress-track {
    position: relative;
    height: 10px;
    border: 1px solid #c4b5fd;
    border-radius: 999px;
    background: #eef2f7;
    overflow: visible;
}

.letters-lesson-progress-fill {
    position: relative;
    z-index: 1;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #16a34a, #22c55e);
    transition: width 0.28s ease;
}

.letters-lesson-progress-thumb {
    position: absolute;
    z-index: 2;
    top: 50%;
    left: 0;
    width: 18px;
    height: 18px;
    border: 2px solid #ffffff;
    border-radius: 999px;
    background: #16a34a;
    box-shadow: 0 4px 10px rgba(22, 163, 74, 0.24);
    transform: translate(-50%, -50%);
    transition: left 0.28s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.letters-lesson-progress-track.is-moving .letters-lesson-progress-thumb {
    box-shadow:
        0 0 0 5px rgba(34, 197, 94, 0.16),
        0 6px 14px rgba(22, 163, 74, 0.28);
}

.letters-lesson-progress-particle {
    position: absolute;
    z-index: 3;
    top: 50%;
    width: 6px;
    height: 6px;
    border-radius: 999px;
    background: var(--particle-color, #22c55e);
    box-shadow: 0 0 8px var(--particle-color, #22c55e);
    pointer-events: none;
    transform: translate(-50%, -50%);
    animation: lettersLessonProgressParticle 760ms ease-out forwards;
}

.letters-lesson-progress.is-complete {
    border-color: #86efac;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.letters-lesson-progress.is-complete .letters-lesson-progress-header strong {
    color: #166534;
}

.letters-lesson-progress.is-complete .letters-lesson-progress-thumb {
    background: #22c55e;
    box-shadow: 0 0 0 5px rgba(34, 197, 94, 0.16);
}

@keyframes lettersLessonProgressParticle {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.35);
    }
    20% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform:
            translate(calc(-50% + var(--particle-x, 0px)), calc(-50% + var(--particle-y, -22px)))
            scale(1.2);
    }
}

.letters-score-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    padding: 10px;
    border: 2px solid #a855f7;
    border-radius: 12px;
    background: linear-gradient(180deg, #faf5ff, #ffffff);
    box-shadow: 0 0 0 1px rgba(168, 85, 247, 0.14);
}

.letters-stat-tile {
    position: relative;
    min-height: 92px;
    padding: 40px 9px 10px;
    border: 2px solid #94a3b8;
    border-radius: 10px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    text-align: center;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.09);
}

.letters-stat-icon {
    position: absolute;
    top: 9px;
    left: 50%;
    display: inline-grid;
    place-items: center;
    width: 30px;
    height: 30px;
    color: #111827;
    font-size: 27px;
    font-weight: 900;
    line-height: 1;
    transform: translateX(-50%);
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none !important;
    box-shadow: none !important;
}

.letters-stat-icon-correct {
    color: #16a34a;
}

.letters-stat-tile strong {
    display: block;
    color: #0f172a;
    font-size: 23px;
}

.letters-stat-tile > span:not(.letters-stat-icon) {
    display: block;
    margin-top: 3px;
    color: var(--muted);
    font-size: 10px;
    font-weight: 900;
    text-transform: uppercase;
}

.letters-prompt-card {
    position: relative;
    display: grid;
    isolation: isolate;
    grid-template-columns: minmax(0, 1fr) minmax(132px, 168px);
    grid-template-areas:
        "label actions"
        "main actions"
        "sub actions";
    gap: 6px 14px;
    justify-items: center;
    align-items: center;
    align-content: center;
    min-height: clamp(188px, 15vw, 200px);
    padding: clamp(12px, 1.8vw, 16px);
    border: 2px solid #9ca3af;
    border-radius: 16px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    text-align: center;
    backface-visibility: hidden;
    transform-style: preserve-3d;
}

.letters-prompt-card.is-flipping-out {
    animation: hskFlashcardFlipOut 260ms cubic-bezier(.4, 0, .2, 1) forwards;
}

.letters-prompt-card.is-flipping-in {
    animation: hskFlashcardFlipIn 360ms cubic-bezier(.2, .8, .2, 1) both;
}

.letters-prompt-card > button.letters-prompt-audio.hsk-flashcard-audio {
    position: absolute;
    top: 14px;
    right: 14px;
    left: auto;
    inset-block-start: 14px;
    inset-inline-end: 14px;
    inset-inline-start: auto;
    margin: 0;
    z-index: 2;
}

.letters-prompt-label {
    grid-area: label;
    color: var(--muted);
    font-size: 13px;
    font-weight: 900;
    text-transform: uppercase;
}

.letters-prompt-main {
    grid-area: main;
    display: grid;
    place-items: center;
    width: min(260px, 100%);
    min-height: clamp(58px, calc(5.5vw + 20px), 86px);
    padding: 10px 14px;
    border-radius: 12px;
    background: #f8fafc;
    color: #0f172a;
    font-size: clamp(38px, 6vw, 62px);
    font-weight: 900;
    line-height: 1;
}

.letters-prompt-main.is-listening {
    font-size: clamp(30px, 4.2vw, 46px);
}

.letters-prompt-sub {
    grid-area: sub;
    min-height: 18px;
    color: #374151;
    font-size: 15px;
    font-weight: 800;
}

.letters-audio-row,
.letters-next-row,
.letters-pronunciation-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    justify-content: center;
}

.letters-audio-row {
    grid-area: actions;
    display: grid;
    grid-template-columns: 1fr;
    justify-self: stretch;
    align-self: center;
    align-content: center;
    min-height: 44px;
}

.letters-audio-row .letters-audio-button {
    width: 100%;
}

.letters-prompt-card.is-pronunciation-mode .letters-audio-row {
    align-self: end;
    align-content: end;
    padding-top: 52px;
}

.letters-play-word {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    line-height: 1.12;
    min-width: 132px;
    min-height: 44px;
    padding: 9px 13px;
    border: 1px solid #9ca3af;
    border-radius: 8px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    position: relative;
    overflow: hidden;
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.1);
    transform: translateY(0) scale(1);
    animation: lettersActionBump 2s ease-in-out infinite;
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        background 0.16s ease,
        border-color 0.16s ease,
        opacity 0.16s ease;
}

.letters-play-word:hover:not(:disabled),
.letters-play-word:focus-visible:not(:disabled) {
    border-color: var(--purple-dark);
    background: linear-gradient(180deg, #f3f4f6, #d8b4fe);
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 8px 18px rgba(88, 28, 135, 0.16);
    outline: none;
}

.letters-play-word:active:not(:disabled) {
    transform: translateY(0) scale(0.985);
    box-shadow: 0 4px 12px rgba(88, 28, 135, 0.12);
}

.letters-play-word.is-playing {
    border-color: var(--purple-dark);
    background: var(--purple-dark);
    color: #ffffff;
}

.letters-play-word:disabled {
    cursor: default;
    opacity: 0.94;
}

.letters-play-word::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.55), transparent);
    pointer-events: none;
    animation: lettersRaySwipe 2.25s ease-in-out infinite;
    transition: left 0.4s ease;
}

.letters-play-word:hover:not(:disabled)::after,
.letters-play-word:focus-visible:not(:disabled)::after {
    left: 140%;
}

.letters-play-text {
    display: grid;
    gap: 1px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.letters-play-main {
    display: block;
    font-size: 13px;
    line-height: 1.1;
}

.letters-audio-button,
.letters-secondary-button {
    border: 1px solid #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    padding: 10px 14px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.letters-audio-button.is-playing,
.practice-audio-button.is-playing {
    border-color: var(--purple-dark);
    background: var(--purple-dark);
    color: #ffffff;
}

.letters-primary-button {
    border: 1px solid var(--green);
    background: linear-gradient(135deg, var(--green), var(--green-bright));
    color: #ffffff;
    padding: 10px 16px;
    box-shadow: 0 8px 18px rgba(22, 163, 74, 0.18);
    animation: lettersActionBump 2s ease-in-out infinite;
}

.letters-primary-button:hover:not(:disabled),
.letters-primary-button:focus-visible:not(:disabled),
#lettersNextButton:hover:not(:disabled),
#lettersNextButton:focus-visible:not(:disabled),
.practice-primary-button:hover:not(:disabled),
.practice-primary-button:focus-visible:not(:disabled),
#practiceNextButton:hover:not(:disabled),
#practiceNextButton:focus-visible:not(:disabled) {
    box-shadow: 0 10px 24px rgba(22, 163, 74, 0.22);
}

#lettersNextButton {
    width: min(380px, 100%);
    min-height: 46px;
    border-color: #16a34a;
    background: #16a34a;
    color: #ffffff;
    position: relative;
    overflow: hidden;
    box-shadow: 0 8px 18px rgba(22, 163, 74, 0.18);
    transform: translateY(0) scale(1);
    animation: lettersActionBump 2s ease-in-out infinite;
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        background 0.16s ease,
        border-color 0.16s ease,
        opacity 0.16s ease;
}

#lettersNextButton::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
    pointer-events: none;
    transition: left 0.4s ease;
}

#lettersNextButton:hover:not(:disabled),
#lettersNextButton:focus-visible:not(:disabled) {
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 10px 24px rgba(22, 163, 74, 0.22);
    outline: none;
}

#lettersNextButton:hover:not(:disabled)::after,
#lettersNextButton:focus-visible:not(:disabled)::after {
    left: 140%;
}

#lettersNextButton:active:not(:disabled) {
    transform: translateY(0) scale(0.985);
    box-shadow: 0 4px 12px rgba(88, 28, 135, 0.12);
}

#lettersNextButton:disabled {
    animation: none;
    box-shadow: none;
}

#lettersNextButton:disabled::after {
    display: none;
}

.letters-primary-button:disabled,
.letters-secondary-button:disabled,
.letters-audio-button:disabled,
.letters-choice:disabled {
    cursor: not-allowed;
    opacity: 0.66;
}

.letters-choice-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    justify-self: center;
    width: min(520px, 92%);
    gap: 8px;
}

.letters-response-slot {
    min-height: 210px;
}

.letters-choice {
    display: grid;
    gap: 3px;
    align-content: center;
    min-height: 66px;
    padding: 10px 12px;
    border: 2px solid #22c55e;
    background: #f8fafc;
    color: var(--ink);
    font-size: 16px;
    text-align: center;
}

.letters-choice small {
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
}

.letters-choice:hover:not(:disabled),
.letters-choice:focus-visible:not(:disabled) {
    border-color: #22c55e;
    background: #f8fafc;
    color: var(--ink);
    opacity: 1;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.14);
    outline: none;
}

.letters-choice:active:not(:disabled) {
    border-color: #22c55e;
    background: #f8fafc;
    color: var(--ink);
    opacity: 1;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.12);
}

body[data-learning-page="letters"] button.letters-choice:hover:not(:disabled),
body[data-learning-page="letters"] button.letters-choice:focus-visible:not(:disabled),
body[data-learning-page="letters"] button.letters-choice:active:not(:disabled) {
    border-color: #22c55e;
    background: #f8fafc;
    color: var(--ink);
    opacity: 1;
}

.letters-choice.is-selected,
.letters-choice.is-selected:disabled,
.letters-choice.is-selected:hover,
.letters-choice.is-selected:focus-visible,
body[data-learning-page="letters"] button.letters-choice.is-selected,
body[data-learning-page="letters"] button.letters-choice.is-selected:disabled,
body[data-learning-page="letters"] button.letters-choice.is-selected:hover,
body[data-learning-page="letters"] button.letters-choice.is-selected:focus-visible,
body[data-learning-page="letters"] button.letters-choice.is-selected:active {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    opacity: 1;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.12);
    transition: none;
}

.letters-choice.is-correct {
    border-color: #16a34a;
    background: #dcfce7;
    color: #166534;
    opacity: 1;
}

.letters-choice.is-correct:hover,
.letters-choice.is-correct:focus-visible,
body[data-learning-page="letters"] button.letters-choice.is-correct,
body[data-learning-page="letters"] button.letters-choice.is-correct:hover,
body[data-learning-page="letters"] button.letters-choice.is-correct:focus-visible,
body[data-learning-page="letters"] button.letters-choice.is-correct:active {
    border-color: #16a34a;
    background: #dcfce7;
    color: #166534;
    opacity: 1;
}

.letters-choice.is-wrong,
.letters-choice.is-wrong:hover,
.letters-choice.is-wrong:focus-visible,
body[data-learning-page="letters"] button.letters-choice.is-wrong,
body[data-learning-page="letters"] button.letters-choice.is-wrong:hover,
body[data-learning-page="letters"] button.letters-choice.is-wrong:focus-visible,
body[data-learning-page="letters"] button.letters-choice.is-wrong:active {
    border-color: #dc2626;
    background: #fee2e2;
    color: #991b1b;
    opacity: 1;
    animation: learningChoiceWrongShake 360ms ease;
}

.letters-choice.is-selected-correct {
    overflow: visible;
    animation: learningChoiceCorrectLift 920ms cubic-bezier(.2, .8, .2, 1) both;
}

.letters-choice.is-selected-correct::before {
    content: "";
    position: absolute;
    inset: -18px;
    z-index: 2;
    border-radius: 14px;
    background:
        radial-gradient(circle, #22c55e 0 2px, transparent 3px) 50% 0 / 8px 8px no-repeat,
        radial-gradient(circle, #86efac 0 2px, transparent 3px) 100% 50% / 8px 8px no-repeat,
        radial-gradient(circle, #f59e0b 0 2px, transparent 3px) 50% 100% / 8px 8px no-repeat,
        radial-gradient(circle, #06b6d4 0 2px, transparent 3px) 0 50% / 8px 8px no-repeat,
        radial-gradient(circle, #16a34a 0 2px, transparent 3px) 86% 14% / 8px 8px no-repeat,
        radial-gradient(circle, #a855f7 0 2px, transparent 3px) 14% 86% / 8px 8px no-repeat;
    pointer-events: none;
    animation: learningChoiceButtonFirework 760ms ease-out both;
}

.letters-firework {
    position: absolute;
    z-index: 3;
    width: 12px;
    height: 12px;
    pointer-events: none;
    transform: translate(-50%, -50%);
}

.letters-firework::before,
.letters-firework::after {
    content: "";
    position: absolute;
    inset: -18px;
    border-radius: 50%;
    background:
        radial-gradient(circle, #22c55e 0 2px, transparent 3px) 50% 0 / 8px 8px no-repeat,
        radial-gradient(circle, #a855f7 0 2px, transparent 3px) 100% 50% / 8px 8px no-repeat,
        radial-gradient(circle, #f59e0b 0 2px, transparent 3px) 50% 100% / 8px 8px no-repeat,
        radial-gradient(circle, #06b6d4 0 2px, transparent 3px) 0 50% / 8px 8px no-repeat,
        radial-gradient(circle, #16a34a 0 2px, transparent 3px) 86% 14% / 8px 8px no-repeat,
        radial-gradient(circle, #7c3aed 0 2px, transparent 3px) 14% 86% / 8px 8px no-repeat;
    animation: lettersFirework 680ms ease-out forwards;
}

.letters-firework::after {
    inset: -28px;
    opacity: 0.75;
    transform: rotate(24deg);
    animation-delay: 70ms;
}

@keyframes lettersActionBump {
    0%, 74%, 100% {
        transform: scale(1);
    }
    82% {
        transform: scale(1.045);
    }
    90% {
        transform: scale(0.985);
    }
}

@keyframes lettersRaySwipe {
    0%, 48%, 100% {
        left: -120%;
    }
    62%, 76% {
        left: 140%;
    }
}

@keyframes lettersFirework {
    0% {
        opacity: 0;
        transform: scale(0.2) rotate(0deg);
    }
    18% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: scale(1.35) rotate(28deg);
    }
}

@keyframes learningChoiceCorrectLift {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    34% {
        transform: translateY(-8px) scale(1.025);
    }
    66% {
        transform: translateY(-3px) scale(1.01);
    }
}

@keyframes learningChoiceWrongShake {
    0%, 100% {
        transform: translateX(0);
    }
    15% {
        transform: translateX(-8px);
    }
    30% {
        transform: translateX(7px);
    }
    45% {
        transform: translateX(-5px);
    }
    60% {
        transform: translateX(4px);
    }
    75% {
        transform: translateX(-2px);
    }
}

@keyframes learningChoiceButtonFirework {
    0% {
        opacity: 0;
        transform: scale(0.18) rotate(0deg);
    }
    18% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: scale(1.32) rotate(26deg);
    }
}

.letters-pronunciation-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    justify-content: center;
    padding: 12px;
    border: 2px solid #94a3b8;
    border-radius: 12px;
    background: #f8fafc;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
}

.letters-pronunciation-panel .speech-wave-field {
    flex: 1 1 260px;
    min-width: 220px;
}

.letters-speech-result {
    width: 100%;
    min-height: 20px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
    text-align: center;
}

.letters-speech-result.is-pass,
.practice-speech-result.is-pass {
    color: #166534;
}

.letters-speech-result.is-low,
.practice-speech-result.is-low {
    color: #991b1b;
}

.speech-wave-field {
    position: relative;
    display: grid;
    align-items: center;
    width: 100%;
    min-height: 96px;
    margin-top: 2px;
    padding: 28px 14px 12px;
    border: 1px solid rgba(124, 58, 237, 0.28);
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    overflow: hidden;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.68);
}

.speech-wave-field.is-listening {
    border-color: var(--purple);
    background: linear-gradient(180deg, #ffffff, #f3e8ff);
    box-shadow: 0 10px 24px rgba(124, 58, 237, 0.12);
}

.speech-wave-canvas {
    position: absolute;
    inset: 0;
    z-index: 1;
    width: 100%;
    height: 100%;
}

.speech-wave-label {
    position: absolute;
    top: 9px;
    left: 12px;
    z-index: 3;
    color: var(--muted);
    font-size: 11px;
    font-weight: 900;
    text-transform: uppercase;
}

.speech-wave-field.is-listening .speech-wave-label {
    color: var(--purple-dark);
}

.letters-feedback {
    min-height: 24px;
    color: var(--muted);
    font-size: 15px;
    font-weight: 800;
    text-align: center;
}

.letters-feedback.is-good {
    color: #166534;
}

.letters-feedback.is-bad {
    color: #991b1b;
}

.practice-listening-shell {
    display: grid;
    gap: 16px;
    margin-top: 22px;
    position: relative;
    overflow: hidden;
    padding: 14px;
    border: 2px solid #cbd5e1;
    border-radius: 16px;
    background: #eef2f7;
    box-shadow: inset 0 0 0 1px #ffffff;
}

.practice-drill-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(240px, 320px);
    gap: 14px;
    align-items: start;
}

.practice-header-controls {
    display: grid;
    gap: 10px;
    align-content: start;
}

.practice-mode-tabs,
.practice-hsk-tabs {
    display: grid;
    gap: 8px;
}

.practice-mode-tabs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.practice-hsk-tabs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.practice-hsk-button,
.practice-mode-button,
.practice-audio-button,
.practice-play-word,
.practice-primary-button,
.practice-choice {
    min-height: 44px;
    border-radius: 8px;
    font-family: inherit;
    font-weight: 900;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transform: translateY(0) scale(1);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        background 0.16s ease,
        border-color 0.16s ease,
        color 0.16s ease,
        opacity 0.16s ease;
}

.practice-hsk-button::after,
.practice-mode-button::after,
.practice-audio-button::after,
.practice-primary-button::after,
.practice-choice::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
    pointer-events: none;
    transition: left 0.4s ease;
}

.practice-hsk-button:hover:not(:disabled),
.practice-hsk-button:focus-visible:not(:disabled),
.practice-mode-button:hover:not(:disabled),
.practice-mode-button:focus-visible:not(:disabled),
.practice-audio-button:hover:not(:disabled),
.practice-audio-button:focus-visible:not(:disabled),
.practice-primary-button:hover:not(:disabled),
.practice-primary-button:focus-visible:not(:disabled),
.practice-choice:hover:not(:disabled),
.practice-choice:focus-visible:not(:disabled) {
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 10px 24px rgba(88, 28, 135, 0.16);
    outline: none;
}

.practice-primary-button:hover:not(:disabled),
.practice-primary-button:focus-visible:not(:disabled),
#practiceNextButton:hover:not(:disabled),
#practiceNextButton:focus-visible:not(:disabled) {
    box-shadow: 0 10px 24px rgba(22, 163, 74, 0.22);
}

.practice-hsk-button:hover:not(:disabled)::after,
.practice-hsk-button:focus-visible:not(:disabled)::after,
.practice-mode-button:hover:not(:disabled)::after,
.practice-mode-button:focus-visible:not(:disabled)::after,
.practice-audio-button:hover:not(:disabled)::after,
.practice-audio-button:focus-visible:not(:disabled)::after,
.practice-primary-button:hover:not(:disabled)::after,
.practice-primary-button:focus-visible:not(:disabled)::after,
.practice-choice:hover:not(:disabled)::after,
.practice-choice:focus-visible:not(:disabled)::after {
    left: 140%;
}

.practice-hsk-button:active:not(:disabled),
.practice-mode-button:active:not(:disabled),
.practice-audio-button:active:not(:disabled),
.practice-primary-button:active:not(:disabled),
.practice-choice:active:not(:disabled) {
    transform: translateY(0) scale(0.985);
    box-shadow: 0 4px 12px rgba(88, 28, 135, 0.12);
}

.practice-hsk-button,
.practice-mode-button {
    border: 1px solid #cbd5e1;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    color: #374151;
    font-size: 13px;
}

.practice-hsk-button {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
}

.practice-hsk-button.is-active {
    border-color: #64748b;
    background: linear-gradient(180deg, #d1d5db, #94a3b8);
    color: #0f172a;
    box-shadow:
        inset 0 0 0 1px rgba(255, 255, 255, 0.44),
        0 8px 18px rgba(15, 23, 42, 0.10);
}

.practice-mode-button[data-category="sentences"].is-active {
    border-color: var(--purple);
    background: linear-gradient(135deg, var(--purple), #a855f7);
    color: #ffffff;
}

.practice-mode-button[data-category="numbers"].is-active {
    border-color: #d97706;
    background: linear-gradient(135deg, var(--amber), #fbbf24);
    color: #111827;
}

.practice-mode-button[data-category="introduction"].is-active {
    border-color: var(--green);
    background: linear-gradient(135deg, var(--green), var(--green-bright));
    color: #ffffff;
}

.practice-mode-button[data-category="dates"].is-active {
    border-color: var(--rose);
    background: linear-gradient(135deg, var(--rose), #fb7185);
    color: #ffffff;
}

.practice-mode-button.is-active {
    box-shadow: 0 8px 18px rgba(124, 58, 237, 0.16);
}

.practice-lesson-progress {
    display: grid;
    gap: 8px;
    padding: 10px 12px;
    min-height: 54px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.72);
}

.practice-lesson-progress-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    color: #475569;
    font-size: 12px;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
}

.practice-lesson-progress-header strong {
    color: #0f172a;
    font-size: 12px;
    white-space: nowrap;
}

.practice-lesson-progress-track {
    position: relative;
    height: 10px;
    border: 1px solid #c4b5fd;
    border-radius: 999px;
    background: #eef2f7;
    overflow: visible;
}

.practice-lesson-progress-fill {
    position: relative;
    z-index: 1;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #16a34a, #22c55e);
    transition: width 0.28s ease;
}

.practice-lesson-progress-thumb {
    position: absolute;
    z-index: 2;
    top: 50%;
    left: 0;
    width: 18px;
    height: 18px;
    border: 2px solid #ffffff;
    border-radius: 999px;
    background: #16a34a;
    box-shadow: 0 4px 10px rgba(22, 163, 74, 0.24);
    transform: translate(-50%, -50%);
    transition: left 0.28s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.practice-lesson-progress-track.is-moving .practice-lesson-progress-thumb {
    box-shadow:
        0 0 0 5px rgba(34, 197, 94, 0.16),
        0 6px 14px rgba(22, 163, 74, 0.28);
}

.practice-lesson-progress-particle {
    position: absolute;
    z-index: 3;
    top: 50%;
    width: 6px;
    height: 6px;
    border-radius: 999px;
    background: var(--particle-color, #22c55e);
    box-shadow: 0 0 8px var(--particle-color, #22c55e);
    pointer-events: none;
    transform: translate(-50%, -50%);
    animation: practiceLessonProgressParticle 760ms ease-out forwards;
}

.practice-lesson-progress.is-complete {
    border-color: #86efac;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.practice-lesson-progress.is-complete .practice-lesson-progress-header strong {
    color: #166534;
}

.practice-lesson-progress.is-complete .practice-lesson-progress-thumb {
    background: #22c55e;
    box-shadow: 0 0 0 5px rgba(34, 197, 94, 0.16);
}

@keyframes practiceLessonProgressParticle {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.35);
    }
    20% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform:
            translate(calc(-50% + var(--particle-x, 0px)), calc(-50% + var(--particle-y, -22px)))
            scale(1.2);
    }
}

.practice-score-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.practice-score-panel {
    border: 2px solid var(--purple);
    border-radius: 12px;
    padding: 10px;
    background: #ffffff;
    box-shadow: 0 0 0 1px rgba(124, 58, 237, 0.18);
}

.practice-score-panel .practice-score-grid {
    gap: 10px;
}

.practice-stat-tile {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 2px;
    padding: 44px 8px 10px;
    min-height: 96px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: #ffffff;
    text-align: center;
}

.practice-stat-icon {
    display: inline-grid;
    place-items: center;
    width: 28px;
    height: 28px;
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    border: 0;
    border-radius: 0;
    background: transparent;
    font-size: 16.5px;
    line-height: 1;
    pointer-events: none;
}

.practice-stat-correct .practice-stat-icon,
.practice-stat-streak .practice-stat-icon,
.practice-stat-question .practice-stat-icon {
    color: #111827;
}

.practice-stat-tile strong {
    display: block;
    color: #0f172a;
    font-size: 26px;
}

.practice-stat-tile > span:not(.practice-stat-icon) {
    display: block;
    margin-top: 3px;
    color: var(--muted);
    font-size: 11px;
    font-weight: 900;
    text-transform: uppercase;
}

.practice-prompt-card {
    display: grid;
    min-height: 150px;
    padding: clamp(16px, 3vw, 24px);
    border: 2px solid transparent;
    border-radius: 16px;
    background:
        linear-gradient(180deg, #f8fafc, #eef2f7) padding-box,
        linear-gradient(135deg, #22c55e, #06b6d4 34%, #7c3aed 68%, #f59e0b) border-box;
    text-align: center;
    backface-visibility: hidden;
    transform-style: preserve-3d;
}

.practice-prompt-card.is-flipping-out {
    animation: hskFlashcardFlipOut 260ms cubic-bezier(.4, 0, .2, 1) forwards;
}

.practice-prompt-card.is-flipping-in {
    animation: hskFlashcardFlipIn 360ms cubic-bezier(.2, .8, .2, 1) both;
}

.practice-prompt-listen-content {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(150px, auto);
    gap: 16px;
    align-items: center;
    width: 100%;
}

.practice-prompt-listen-text {
    display: grid;
    gap: 10px;
    justify-items: center;
    min-width: 0;
    width: 100%;
}

.practice-prompt-label {
    color: var(--muted);
    font-size: 13px;
    font-weight: 900;
    text-transform: uppercase;
}

.practice-audio-row,
.practice-next-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    justify-content: center;
}

.practice-prompt-card .practice-audio-row {
    display: grid;
    grid-template-columns: 1fr;
    justify-self: end;
    align-self: center;
    width: min(180px, 100%);
}

.practice-prompt-card .practice-play-word,
.practice-prompt-card .practice-audio-button {
    width: 100%;
    min-width: 0;
}

.practice-prompt-card .speech-wave-field {
    width: 100%;
    min-height: 118px;
    margin-top: 0;
}

.practice-prompt-card .practice-speech-result {
    width: 100%;
}

.practice-play-word {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    line-height: 1.12;
    min-width: 132px;
    min-height: 44px;
    padding: 9px 13px;
    border: 1px solid #9ca3af;
    border-radius: 8px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.1);
    animation: none;
}

.practice-play-word:hover:not(:disabled),
.practice-play-word:focus-visible:not(:disabled) {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.14);
    outline: none;
}

.practice-play-word:active:not(:disabled) {
    transform: translateY(0) scale(0.985);
    box-shadow: 0 4px 12px rgba(88, 28, 135, 0.12);
}

.practice-play-word.is-playing {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.1);
}

.practice-play-word:disabled {
    cursor: default;
    opacity: 0.94;
}

.practice-play-word::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.55), transparent);
    pointer-events: none;
    animation: none;
    transition: left 0.4s ease;
}

.practice-play-word:hover:not(:disabled)::after,
.practice-play-word:focus-visible:not(:disabled)::after {
    left: 140%;
}

.practice-play-text {
    display: grid;
    gap: 1px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.practice-play-main {
    display: block;
    font-size: 13px;
    line-height: 1.1;
}

.practice-audio-button {
    border: 1px solid #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    padding: 10px 14px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.practice-prompt-card .practice-play-word,
.practice-prompt-card .practice-audio-button {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.1);
}

.practice-prompt-card .practice-play-word:hover:not(:disabled),
.practice-prompt-card .practice-play-word:focus-visible:not(:disabled),
.practice-prompt-card .practice-audio-button:hover:not(:disabled),
.practice-prompt-card .practice-audio-button:focus-visible:not(:disabled) {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.14);
    outline: none;
}

.practice-prompt-card .practice-play-word:active:not(:disabled),
.practice-prompt-card .practice-audio-button:active:not(:disabled) {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #d1d5db, #cbd5e1);
    color: var(--ink);
    transform: translateY(0) scale(0.985);
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.12);
}

.practice-prompt-card .practice-play-word.is-attention,
.practice-prompt-card .practice-audio-button.is-attention {
    animation: lettersActionBump 2s ease-in-out infinite;
}

.practice-prompt-card .practice-play-word.is-attention::after,
.practice-prompt-card .practice-audio-button.is-attention::after {
    animation: lettersRaySwipe 2.25s ease-in-out infinite;
}

.practice-primary-button {
    border: 1px solid var(--green);
    background: linear-gradient(135deg, var(--green), var(--green-bright));
    color: #ffffff;
    padding: 10px 16px;
    box-shadow: 0 8px 18px rgba(22, 163, 74, 0.18);
    animation: lettersActionBump 2s ease-in-out infinite;
}

#practiceNextButton {
    width: min(380px, 100%);
    min-height: 46px;
    border-color: #16a34a;
    background: #16a34a;
    color: #ffffff;
}

#practiceNextButton:disabled {
    animation: none;
    box-shadow: none;
}

#practiceNextButton:disabled::after {
    display: none;
}

.practice-primary-button:disabled,
.practice-audio-button:disabled,
.practice-choice:disabled {
    cursor: not-allowed;
    opacity: 0.66;
}

.practice-prompt-card .practice-audio-button.is-playing,
.practice-prompt-card .practice-audio-button:disabled {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    opacity: 0.94;
    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.1);
}

.practice-prompt-card .practice-play-word.is-hidden,
.practice-prompt-card .practice-audio-button.is-hidden {
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    animation: none;
}

.practice-choice-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    justify-self: center;
    width: min(520px, 92%);
    gap: 8px;
}

.practice-choice {
    display: grid;
    gap: 3px;
    align-content: center;
    min-height: 66px;
    padding: 10px 12px;
    border: 2px solid #22c55e;
    background: #f8fafc;
    color: var(--ink);
    font-size: 16px;
    text-align: center;
}

.practice-choice small {
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
}

.practice-choice:hover:not(:disabled),
.practice-choice:focus-visible:not(:disabled) {
    border-color: #22c55e;
    background: #f8fafc;
    color: var(--ink);
    opacity: 1;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.14);
    outline: none;
}

.practice-choice:active:not(:disabled) {
    border-color: #22c55e;
    background: #f8fafc;
    color: var(--ink);
    opacity: 1;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.12);
}

body[data-learning-page="listen"] button.practice-choice:hover:not(:disabled),
body[data-learning-page="listen"] button.practice-choice:focus-visible:not(:disabled),
body[data-learning-page="listen"] button.practice-choice:active:not(:disabled) {
    border-color: #22c55e;
    background: #f8fafc;
    color: var(--ink);
    opacity: 1;
}

.practice-choice.is-selected,
.practice-choice.is-selected:disabled,
.practice-choice.is-selected:hover,
.practice-choice.is-selected:focus-visible,
body[data-learning-page="listen"] button.practice-choice.is-selected,
body[data-learning-page="listen"] button.practice-choice.is-selected:disabled,
body[data-learning-page="listen"] button.practice-choice.is-selected:hover,
body[data-learning-page="listen"] button.practice-choice.is-selected:focus-visible,
body[data-learning-page="listen"] button.practice-choice.is-selected:active {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
    opacity: 1;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.12);
    transition: none;
}

.practice-choice.is-correct {
    border-color: #16a34a;
    background: #dcfce7;
    color: #166534;
    opacity: 1;
}

.practice-choice.is-correct:hover,
.practice-choice.is-correct:focus-visible,
body[data-learning-page="listen"] button.practice-choice.is-correct,
body[data-learning-page="listen"] button.practice-choice.is-correct:hover,
body[data-learning-page="listen"] button.practice-choice.is-correct:focus-visible,
body[data-learning-page="listen"] button.practice-choice.is-correct:active {
    border-color: #16a34a;
    background: #dcfce7;
    color: #166534;
    opacity: 1;
}

.practice-choice.is-wrong,
.practice-choice.is-wrong:hover,
.practice-choice.is-wrong:focus-visible,
body[data-learning-page="listen"] button.practice-choice.is-wrong,
body[data-learning-page="listen"] button.practice-choice.is-wrong:hover,
body[data-learning-page="listen"] button.practice-choice.is-wrong:focus-visible,
body[data-learning-page="listen"] button.practice-choice.is-wrong:active {
    border-color: #dc2626;
    background: #fee2e2;
    color: #991b1b;
    opacity: 1;
    animation: learningChoiceWrongShake 360ms ease;
}

.practice-choice.is-selected-correct {
    overflow: visible;
    animation: learningChoiceCorrectLift 920ms cubic-bezier(.2, .8, .2, 1) both;
}

.practice-choice.is-selected-correct::before {
    content: "";
    position: absolute;
    inset: -18px;
    z-index: 2;
    border-radius: 14px;
    background:
        radial-gradient(circle, #22c55e 0 2px, transparent 3px) 50% 0 / 8px 8px no-repeat,
        radial-gradient(circle, #86efac 0 2px, transparent 3px) 100% 50% / 8px 8px no-repeat,
        radial-gradient(circle, #f59e0b 0 2px, transparent 3px) 50% 100% / 8px 8px no-repeat,
        radial-gradient(circle, #06b6d4 0 2px, transparent 3px) 0 50% / 8px 8px no-repeat,
        radial-gradient(circle, #16a34a 0 2px, transparent 3px) 86% 14% / 8px 8px no-repeat,
        radial-gradient(circle, #a855f7 0 2px, transparent 3px) 14% 86% / 8px 8px no-repeat;
    pointer-events: none;
    animation: learningChoiceButtonFirework 760ms ease-out both;
}

.practice-firework {
    position: absolute;
    z-index: 3;
    width: 12px;
    height: 12px;
    pointer-events: none;
    transform: translate(-50%, -50%);
}

.practice-firework::before,
.practice-firework::after {
    content: "";
    position: absolute;
    inset: -18px;
    border-radius: 50%;
    background:
        radial-gradient(circle, #22c55e 0 2px, transparent 3px) 50% 0 / 8px 8px no-repeat,
        radial-gradient(circle, #a855f7 0 2px, transparent 3px) 100% 50% / 8px 8px no-repeat,
        radial-gradient(circle, #f59e0b 0 2px, transparent 3px) 50% 100% / 8px 8px no-repeat,
        radial-gradient(circle, #06b6d4 0 2px, transparent 3px) 0 50% / 8px 8px no-repeat,
        radial-gradient(circle, #16a34a 0 2px, transparent 3px) 86% 14% / 8px 8px no-repeat,
        radial-gradient(circle, #e11d48 0 2px, transparent 3px) 14% 86% / 8px 8px no-repeat;
    animation: lettersFirework 680ms ease-out forwards;
}

.practice-firework::after {
    inset: -28px;
    opacity: 0.75;
    transform: rotate(24deg);
    animation-delay: 70ms;
}

.practice-speech-result {
    grid-column: 1 / -1;
    min-height: 20px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
    text-align: center;
}

.practice-feedback {
    min-height: 24px;
    color: var(--muted);
    font-size: 15px;
    font-weight: 800;
    text-align: center;
}

.practice-feedback.is-good {
    color: #166534;
}

.practice-feedback.is-bad {
    color: #991b1b;
}

.write-drill-shell {
    display: grid;
    gap: 16px;
    margin-top: 22px;
    position: relative;
    overflow: hidden;
    padding: 14px;
    border: 2px solid #cbd5e1;
    border-radius: 16px;
    background: #eef2f7;
    box-shadow: inset 0 0 0 1px #ffffff;
}

.write-drill-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(240px, 320px);
    gap: 14px;
    align-items: start;
}

.write-header-controls {
    display: grid;
    gap: 10px;
    align-content: start;
}

.write-workspace {
    position: relative;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    align-items: start;
    --write-board-size: min(440px, 100%);
}

.write-workspace::before {
    content: "";
    position: absolute;
    top: 4px;
    bottom: 4px;
    left: 50%;
    width: 1px;
    background: #cbd5e1;
    transform: translateX(-50%);
    pointer-events: none;
}

.write-workspace > .write-prompt-card,
.write-workspace > .write-canvas-shell {
    width: var(--write-board-size);
    max-width: var(--write-board-size);
    justify-self: center;
}

.write-hsk-tabs,
.write-mode-tabs {
    display: grid;
    gap: 8px;
}

.write-hsk-tabs {
    grid-template-columns: repeat(6, minmax(0, 1fr));
}

.write-hsk-section {
    padding: 10px 12px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.72);
}

.write-mode-tabs {
    grid-template-columns: minmax(0, 1fr);
}

.write-hsk-button,
.write-mode-button,
.write-primary-button,
.write-secondary-button {
    min-height: 44px;
    border-radius: 8px;
    font-family: inherit;
    font-weight: 900;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transform: translateY(0) scale(1);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        background 0.16s ease,
        border-color 0.16s ease,
        color 0.16s ease,
        opacity 0.16s ease;
}

.write-hsk-button::after,
.write-mode-button::after,
.write-primary-button::after,
.write-secondary-button::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.35), transparent);
    pointer-events: none;
    transition: left 0.4s ease;
}

.write-hsk-button:hover:not(:disabled),
.write-hsk-button:focus-visible:not(:disabled),
.write-mode-button:hover:not(:disabled),
.write-mode-button:focus-visible:not(:disabled),
.write-primary-button:hover:not(:disabled),
.write-primary-button:focus-visible:not(:disabled),
.write-secondary-button:hover:not(:disabled),
.write-secondary-button:focus-visible:not(:disabled) {
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 10px 24px rgba(88, 28, 135, 0.16);
    outline: none;
}

.write-hsk-button:hover:not(:disabled)::after,
.write-hsk-button:focus-visible:not(:disabled)::after,
.write-mode-button:hover:not(:disabled)::after,
.write-primary-button:hover:not(:disabled)::after,
.write-primary-button:focus-visible:not(:disabled)::after,
.write-secondary-button:hover:not(:disabled)::after,
.write-secondary-button:focus-visible:not(:disabled)::after {
    left: 140%;
}

.write-hsk-button:active:not(:disabled),
.write-mode-button:active:not(:disabled),
.write-primary-button:active:not(:disabled),
.write-secondary-button:active:not(:disabled) {
    transform: translateY(0) scale(0.985);
    box-shadow: 0 4px 12px rgba(88, 28, 135, 0.12);
}

.write-hsk-button,
.write-mode-button {
    border: 1px solid #cbd5e1;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    color: #374151;
    font-size: 13px;
}

.write-hsk-section .write-hsk-button::after {
    left: 0;
    transform: translateX(-180%);
    transition: transform 0.4s ease !important;
}

.write-hsk-section .write-hsk-button:hover:not(:disabled)::after,
.write-hsk-section .write-hsk-button:focus-visible:not(:disabled)::after {
    left: 0;
    transform: translateX(240%);
}

.write-hsk-button {
    border-color: #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
}

.write-hsk-button.is-active {
    border-color: #64748b;
    background: linear-gradient(180deg, #d1d5db, #94a3b8);
    color: #0f172a;
    box-shadow:
        inset 0 0 0 1px rgba(255, 255, 255, 0.44),
        0 8px 18px rgba(15, 23, 42, 0.10);
}

.write-mode-button[data-mode="trace"].is-active {
    border-color: var(--green);
    background: linear-gradient(135deg, var(--green), var(--green-bright));
    color: #ffffff;
}

.write-exercise-progress {
    display: grid;
    gap: 8px;
    padding: 10px 12px;
    min-height: 54px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.72);
}

.write-exercise-progress-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    color: #475569;
    font-size: 12px;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
}

.write-exercise-progress-header strong {
    color: #0f172a;
    font-size: 12px;
    white-space: nowrap;
}

.write-exercise-progress-track {
    position: relative;
    height: 10px;
    border: 1px solid #c4b5fd;
    border-radius: 999px;
    background: #eef2f7;
    overflow: visible;
}

.write-exercise-progress-fill {
    position: relative;
    z-index: 1;
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #16a34a, #22c55e);
    transition: width 0.28s ease;
}

.write-exercise-progress-thumb {
    position: absolute;
    z-index: 2;
    top: 50%;
    left: 0;
    width: 18px;
    height: 18px;
    border: 2px solid #ffffff;
    border-radius: 999px;
    background: #16a34a;
    box-shadow: 0 4px 10px rgba(22, 163, 74, 0.24);
    transform: translate(-50%, -50%);
    transition: left 0.28s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.write-exercise-progress-track.is-moving .write-exercise-progress-thumb {
    box-shadow:
        0 0 0 5px rgba(34, 197, 94, 0.16),
        0 6px 14px rgba(22, 163, 74, 0.28);
}

.write-exercise-progress-particle {
    position: absolute;
    z-index: 3;
    top: 50%;
    width: 6px;
    height: 6px;
    border-radius: 999px;
    background: var(--particle-color, #22c55e);
    box-shadow: 0 0 8px var(--particle-color, #22c55e);
    pointer-events: none;
    transform: translate(-50%, -50%);
    animation: writeExerciseProgressParticle 760ms ease-out forwards;
}

.write-exercise-progress.is-complete {
    border-color: #86efac;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.write-exercise-progress.is-complete .write-exercise-progress-header strong {
    color: #166534;
}

.write-exercise-progress.is-complete .write-exercise-progress-thumb {
    background: #22c55e;
    box-shadow: 0 0 0 5px rgba(34, 197, 94, 0.16);
}

@keyframes writeExerciseProgressParticle {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.35);
    }
    20% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform:
            translate(calc(-50% + var(--particle-x, 0px)), calc(-50% + var(--particle-y, -22px)))
            scale(1.2);
    }
}

.write-score-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.write-score-panel {
    border: 2px solid var(--purple);
    border-radius: 12px;
    padding: 10px;
    background: #ffffff;
    box-shadow: 0 0 0 1px rgba(124, 58, 237, 0.18);
}

.write-score-panel .write-score-grid {
    gap: 10px;
}

.write-stat-tile {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 2px;
    padding: 44px 8px 10px;
    min-height: 96px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    text-align: center;
    background: #ffffff;
}

.write-stat-icon {
    display: inline-grid;
    place-items: center;
    width:120px;
    height: 120px;
    margin: 0;
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    border: 0;
    border-radius: 0;
    background: transparent;
    font-size: 240px;
    line-height: 2;
    pointer-events: none;
}

.write-stat-correct .write-stat-icon {
    color: #111827;
}

.write-stat-streak .write-stat-icon {
    color: #111827;
}

.write-stat-question .write-stat-icon {
    color: #111827;
}

.write-stat-tile strong {
    display: block;
    color: #0f172a;
    font-size: 26px;
}

.write-stat-tile span {
    display: block;
    margin-top: 3px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 900;
    text-transform: uppercase;
}

.write-prompt-card {
    position: relative;
    display: grid;
    gap: 12px;
    justify-items: center;
    align-content: center;
    aspect-ratio: 1 / 1;
    min-height: 300px;
    padding: clamp(14px, 3vw, 22px);
    border: 2px solid #9ca3af;
    border-radius: 16px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    text-align: center;
    width: 100%;
}

.write-prompt-card > button.write-audio-button.hsk-flashcard-audio {
    position: absolute;
    top: 14px;
    right: 14px;
    inset-block-start: 14px;
    inset-inline-end: 14px;
    margin: 0;
    z-index: 2;
}

.write-prompt-label {
    color: var(--muted);
    font-size: 13px;
    font-weight: 900;
    text-transform: uppercase;
}

.write-prompt-main {
    width: min(248px, 100%);
    min-height: clamp(124px, calc(8vw + 46px), 152px);
    padding: 12px 14px;
    border-radius: 12px;
    display: grid;
    place-items: center;
    font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", serif;
    background: #f8fafc;
    color: #0f172a;
    font-size: clamp(76px, 8vw, 104px);
    font-weight: 900;
    line-height: 1;
    border: 1px solid transparent;
}

.write-prompt-sub {
    min-height: 24px;
    color: #374151;
    font-size: 18px;
    font-weight: 800;
}

.write-prompt-help {
    min-height: 20px;
    margin-top: 6px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
    text-align: center;
}

.write-canvas-shell {
    position: relative;
    display: grid;
    grid-template-rows: minmax(0, 1fr) auto;
    align-content: center;
    gap: 8px;
    isolation: isolate;
    overflow: visible;
    width: var(--write-board-size);
    max-width: var(--write-board-size);
    aspect-ratio: 1 / 1;
    min-height: 300px;
    padding: clamp(14px, 3vw, 22px);
    border: 2px solid #9ca3af;
    border-radius: 16px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    box-shadow: none;
    transform: translateY(0) scale(1);
    transition:
        border-color 0.18s ease,
        box-shadow 0.18s ease,
        transform 0.18s cubic-bezier(.2, .8, .2, 1);
}

.write-canvas-wrap {
    position: relative;
    width: auto;
    height: 100%;
    max-width: 100%;
    aspect-ratio: 1 / 1;
    justify-self: center;
    align-self: center;
    border-radius: 12px;
    border: 1px solid #cbd5e1;
    background: #ffffff;
    box-shadow:
        inset 0 0 0 2px rgba(255, 255, 255, 0.72),
        inset 0 0 0 3px rgba(148, 163, 184, 0.18);
    overflow: hidden;
}

.write-canvas-shell.is-passed {
    border-color: #16a34a;
    box-shadow:
        0 0 0 3px rgba(34, 197, 94, 0.16),
        0 10px 22px rgba(15, 23, 42, 0.10);
    animation: writeCanvasLift 1000ms cubic-bezier(.2, .8, .2, 1) both;
}

.write-canvas-shell.is-passed .write-canvas-wrap {
    border-color: #16a34a;
}

.write-corner-firework {
    position: absolute;
    z-index: 4;
    width: 78px;
    height: 78px;
    opacity: 0;
    pointer-events: none;
    background:
        radial-gradient(circle, #22c55e 0 3px, transparent 4px) 50% 0 / 8px 8px no-repeat,
        radial-gradient(circle, #f59e0b 0 3px, transparent 4px) 88% 22% / 8px 8px no-repeat,
        radial-gradient(circle, #2563eb 0 3px, transparent 4px) 100% 58% / 8px 8px no-repeat,
        radial-gradient(circle, #a855f7 0 3px, transparent 4px) 66% 94% / 8px 8px no-repeat,
        radial-gradient(circle, #16a34a 0 3px, transparent 4px) 22% 88% / 8px 8px no-repeat,
        radial-gradient(circle, #ef4444 0 3px, transparent 4px) 0 44% / 8px 8px no-repeat;
    transform: translate(var(--firework-x, 0), var(--firework-y, 0)) scale(0.2);
    transform-origin: center;
}

.write-corner-firework::before,
.write-corner-firework::after {
    content: "";
    position: absolute;
    inset: 35px;
    border-radius: 999px;
    background: currentColor;
    color: #22c55e;
    box-shadow:
        0 -24px 0 #22c55e,
        18px -18px 0 #f59e0b,
        26px 0 0 #2563eb,
        18px 18px 0 #a855f7,
        0 26px 0 #16a34a,
        -18px 18px 0 #ef4444,
        -26px 0 0 #06b6d4,
        -18px -18px 0 #84cc16;
}

.write-corner-firework::after {
    transform: rotate(22deg) scale(0.72);
    opacity: 0.8;
}

.write-corner-firework-tl {
    top: -28px;
    left: -28px;
    --firework-x: -18px;
    --firework-y: -18px;
}

.write-corner-firework-tr {
    top: -28px;
    right: -28px;
    --firework-x: 18px;
    --firework-y: -18px;
}

.write-corner-firework-br {
    right: -28px;
    bottom: -28px;
    --firework-x: 18px;
    --firework-y: 18px;
}

.write-corner-firework-bl {
    bottom: -28px;
    left: -28px;
    --firework-x: -18px;
    --firework-y: 18px;
}

.write-canvas-shell.is-passed .write-corner-firework {
    animation: writeCornerFirework 980ms ease-out both;
}

.write-canvas-shell.is-passed .write-corner-firework-tr {
    animation-delay: 70ms;
}

.write-canvas-shell.is-passed .write-corner-firework-br {
    animation-delay: 140ms;
}

.write-canvas-shell.is-passed .write-corner-firework-bl {
    animation-delay: 210ms;
}

.write-canvas-shell.is-failed {
    border-color: #dc2626;
    box-shadow:
        0 0 0 3px rgba(220, 38, 38, 0.14),
        0 12px 24px rgba(15, 23, 42, 0.12);
}

@keyframes writeCanvasLift {
    0% {
        transform: translateY(0) scale(1);
    }
    36% {
        transform: translateY(-8px) scale(1.018);
    }
    64% {
        transform: translateY(-3px) scale(1.006);
    }
    100% {
        transform: translateY(0) scale(1);
    }
}

@keyframes writeCornerFirework {
    0% {
        opacity: 0;
        transform: translate(0, 0) scale(0.15) rotate(0deg);
    }
    18% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translate(var(--firework-x, 0), var(--firework-y, 0)) scale(1.18) rotate(26deg);
    }
}

@media (prefers-reduced-motion: reduce) {
    .write-canvas-shell.is-passed {
        animation: none;
        transform: none;
    }

    .write-canvas-shell.is-passed .write-corner-firework {
        animation: none;
    }
}

.write-canvas {
    position: relative;
    z-index: 3;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    touch-action: none;
}

.write-guide-glyph {
    position: absolute;
    inset: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", serif;
    text-align: center;
    pointer-events: none;
    color: #9ca3af;
    font-size: clamp(72px, 18vw, 150px);
    font-weight: 900;
    line-height: 1;
    opacity: 0;
    transform: translateY(-0.05em);
    transition: opacity 0.2s ease;
}

.write-guide-glyph.is-visible {
    opacity: 1;
}

.write-direction-overlay {
    position: absolute;
    inset: 0;
    z-index: 4;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.write-direction-overlay.is-visible {
    opacity: 1;
}

.write-direction-arrow {
    position: absolute;
    display: none;
    pointer-events: none;
    --arrow-left: 0px;
    --arrow-top: 0px;
    --arrow-angle: 0deg;
    --arrow-tail: 0px;
    top: var(--arrow-top);
    left: var(--arrow-left);
    width: 0;
    height: 0;
    margin: 0;
    color: rgba(22, 163, 74, 0.9);
    transform-origin: 0 50%;
    transform: rotate(var(--arrow-angle));
    opacity: 0;
    filter: drop-shadow(0 1px 1px rgba(15, 23, 42, 0.3));
}

.write-direction-arrow::before,
.write-direction-arrow::after {
    position: absolute;
    pointer-events: none;
}

.write-direction-arrow::before {
    content: "";
    left: 0;
    top: 50%;
    width: 0;
    height: 0;
    transform: translate(-25%, -50%);
    border-top: 18px solid transparent;
    border-bottom: 18px solid transparent;
    border-left: 14px solid currentColor;
    opacity: 0.95;
}

.write-direction-arrow.is-current {
    display: none;
    opacity: 1;
}

.write-direction-arrow::after {
    content: "";
    top: 50%;
    left: calc(-1 * var(--arrow-tail));
    width: var(--arrow-tail);
    transform: translateY(-50%);
    height: 9px;
    opacity: 0.45;
    border-radius: 999px;
    background: currentColor;
}

.write-direction-overlay.is-visible .write-direction-arrow.is-current {
    opacity: 1;
}

.write-direction-overlay:not(.is-visible) .write-direction-arrow.is-current {
    opacity: 0;
}

.write-toolbar {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
}

.write-primary-button {
    border: 1px solid var(--green);
    background: linear-gradient(135deg, var(--green), var(--green-bright));
    color: #ffffff;
    box-shadow: 0 8px 18px rgba(22, 163, 74, 0.18);
}

.write-secondary-button {
    border: 1px solid #9ca3af;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: var(--ink);
}

.write-primary-button:disabled,
.write-secondary-button:disabled {
    cursor: not-allowed;
    opacity: 0.66;
}

.write-feedback {
    min-height: 24px;
    color: var(--muted);
    font-size: 15px;
    font-weight: 800;
    text-align: center;
}

.write-feedback.is-good {
    color: #166534;
}

.write-feedback.is-bad {
    color: #991b1b;
}

.forum-app {
    display: grid;
    gap: 18px;
    margin-top: 22px;
}

.forum-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.forum-status-chip {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 7px 12px;
    border: 1px solid rgba(22, 163, 74, 0.34);
    border-radius: 999px;
    background: #ecfdf5;
    color: #166534;
    font-size: 12px;
    font-weight: 900;
    text-transform: uppercase;
}

.forum-status-chip.is-local {
    border-color: rgba(245, 158, 11, 0.42);
    background: #fffbeb;
    color: #92400e;
}

.forum-refresh-button,
.forum-submit-button,
.forum-admin-button,
.forum-admin-inline-button {
    min-height: 44px;
    border-radius: 8px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 900;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transform: translateY(0) scale(1);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        box-shadow 0.16s ease,
        border-color 0.16s ease,
        opacity 0.16s ease;
}

.forum-refresh-button::after,
.forum-submit-button::after,
.forum-admin-button::after,
.forum-admin-inline-button::after {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.36), transparent);
    pointer-events: none;
    transition: left 0.4s ease;
}

.forum-refresh-button:hover:not(:disabled),
.forum-refresh-button:focus-visible:not(:disabled),
.forum-submit-button:hover:not(:disabled),
.forum-submit-button:focus-visible:not(:disabled),
.forum-admin-button:hover:not(:disabled),
.forum-admin-button:focus-visible:not(:disabled),
.forum-admin-inline-button:hover:not(:disabled),
.forum-admin-inline-button:focus-visible:not(:disabled) {
    transform: translateY(-2px) scale(1.01);
    outline: none;
}

.forum-refresh-button:hover:not(:disabled)::after,
.forum-refresh-button:focus-visible:not(:disabled)::after,
.forum-submit-button:hover:not(:disabled)::after,
.forum-submit-button:focus-visible:not(:disabled)::after,
.forum-admin-button:hover:not(:disabled)::after,
.forum-admin-button:focus-visible:not(:disabled)::after,
.forum-admin-inline-button:hover:not(:disabled)::after,
.forum-admin-inline-button:focus-visible:not(:disabled)::after {
    left: 140%;
}

.forum-refresh-button:active:not(:disabled),
.forum-submit-button:active:not(:disabled),
.forum-admin-button:active:not(:disabled),
.forum-admin-inline-button:active:not(:disabled) {
    transform: translateY(0) scale(0.985);
}

.forum-refresh-button {
    min-width: 110px;
    border: 1px solid #9ca3af;
    background: linear-gradient(180deg, #f8fafc, #e5e7eb);
    color: var(--ink);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
}

.forum-submit-button {
    min-width: 150px;
    border: 1px solid var(--green);
    background: linear-gradient(135deg, var(--green), var(--green-bright));
    color: #ffffff;
    box-shadow: 0 8px 18px rgba(22, 163, 74, 0.18);
}

.forum-refresh-button:disabled,
.forum-submit-button:disabled,
.forum-admin-button:disabled,
.forum-admin-inline-button:disabled {
    cursor: not-allowed;
    opacity: 0.62;
}

.forum-admin-button,
.forum-admin-inline-button {
    border: 1px solid #9ca3af;
    background: linear-gradient(180deg, #f8fafc, #e5e7eb);
    color: var(--ink);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.08);
}

.forum-admin-button {
    min-width: 82px;
    min-height: 36px;
    padding: 7px 10px;
    font-size: 12px;
}

.forum-admin-button--danger,
.forum-admin-inline-button {
    border-color: rgba(225, 29, 72, 0.34);
    background: #fff1f2;
    color: #be123c;
}

.forum-admin-inline-button {
    min-height: 28px;
    padding: 4px 8px;
    font-size: 11px;
    box-shadow: none;
}

.forum-composer,
.forum-thread-list-shell,
.forum-thread-panel {
    border: 2px solid #cbd5e1;
    border-radius: 14px;
    background: #ffffff;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
}

.forum-composer {
    display: grid;
    grid-template-columns: minmax(190px, 0.34fr) minmax(0, 0.66fr);
    gap: 18px;
    padding: clamp(16px, 2vw, 22px);
    border-color: rgba(37, 99, 235, 0.38);
}

.forum-composer h2,
.forum-section-heading h2,
.forum-thread-detail-header h2 {
    margin: 0;
    color: var(--purple-dark);
}

.forum-composer h2,
.forum-section-heading h2 {
    font-size: 22px;
}

.forum-composer p {
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 15px;
    line-height: 1.5;
}

.forum-form,
.forum-reply-form {
    display: grid;
    gap: 12px;
}

.forum-form label,
.forum-reply-form label {
    display: grid;
    gap: 7px;
}

.forum-honeypot {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.forum-form span,
.forum-reply-form span {
    color: #334155;
    font-size: 13px;
    font-weight: 900;
}

.forum-form input,
.forum-form textarea,
.forum-reply-form input,
.forum-reply-form textarea {
    width: 100%;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    background: #f8fafc;
    color: var(--ink);
    font: inherit;
    font-size: 15px;
    line-height: 1.45;
    padding: 12px 13px;
    resize: vertical;
    transition: border-color 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}

.forum-form input:focus,
.forum-form textarea:focus,
.forum-reply-form input:focus,
.forum-reply-form textarea:focus {
    border-color: rgba(124, 58, 237, 0.52);
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.12);
    outline: none;
}

.forum-form input:disabled,
.forum-form textarea:disabled,
.forum-reply-form input:disabled,
.forum-reply-form textarea:disabled {
    cursor: not-allowed;
    opacity: 0.68;
}

.forum-captcha input {
    max-width: 180px;
}

.forum-form-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.forum-form-footer > span {
    min-width: 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.35;
}

.forum-layout {
    display: grid;
    grid-template-columns: minmax(260px, 0.38fr) minmax(0, 0.62fr);
    gap: 18px;
    align-items: start;
}

.forum-thread-list-shell,
.forum-thread-panel {
    min-height: 420px;
    padding: 16px;
}

.forum-thread-list-shell {
    min-height: 0;
    border-color: rgba(245, 158, 11, 0.42);
}

.forum-thread-panel {
    border-color: rgba(22, 163, 74, 0.40);
}

.forum-thread-panel--featured {
    min-height: 0;
}

.forum-section-heading,
.forum-thread-detail-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.forum-section-heading {
    margin-bottom: 12px;
}

.forum-section-heading span,
.forum-thread-lock,
.forum-thread-pin,
.forum-thread-pending,
.forum-post-pending {
    display: inline-flex;
    align-items: center;
    min-height: 26px;
    padding: 5px 9px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 900;
    text-transform: uppercase;
}

.forum-thread-badges {
    display: inline-flex;
    flex: 0 0 auto;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 6px;
}

.forum-section-heading span {
    border: 1px solid rgba(22, 163, 74, 0.28);
    background: #ecfdf5;
    color: #166534;
}

.forum-thread-list {
    display: grid;
    gap: 10px;
}

.forum-thread-button {
    display: grid;
    gap: 8px;
    width: 100%;
    min-height: 104px;
    padding: 13px;
    border: 2px solid #bbf7d0;
    border-radius: 12px;
    background: #ffffff;
    color: var(--ink);
    font-family: inherit;
    text-align: left;
    cursor: pointer;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.05);
    transform: translateY(0) scale(1);
    transition: transform 0.16s cubic-bezier(.2, .8, .2, 1), box-shadow 0.16s ease, border-color 0.16s ease;
}

.forum-thread-button:nth-child(3n + 1) {
    border-color: #bbf7d0;
}

.forum-thread-button:nth-child(3n + 2) {
    border-color: #bfdbfe;
}

.forum-thread-button:nth-child(3n) {
    border-color: #fed7aa;
}

.forum-thread-button:hover,
.forum-thread-button:focus-visible {
    transform: translateY(-2px) scale(1.005);
    box-shadow: 0 12px 26px rgba(15, 23, 42, 0.10);
    outline: none;
}

.forum-thread-button.is-active {
    border-color: var(--green);
    box-shadow:
        0 0 0 3px rgba(34, 197, 94, 0.14),
        0 12px 26px rgba(22, 163, 74, 0.16);
}

.forum-thread-title-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 10px;
    min-width: 0;
}

.forum-thread-title-row strong {
    min-width: 0;
    color: var(--ink);
    font-size: 15px;
    line-height: 1.25;
    overflow-wrap: anywhere;
}

.forum-thread-pin {
    flex: 0 0 auto;
    border: 1px solid rgba(245, 158, 11, 0.38);
    background: #fffbeb;
    color: #92400e;
}

.forum-thread-pending,
.forum-post-pending {
    border: 1px solid rgba(37, 99, 235, 0.34);
    background: #eff6ff;
    color: #1d4ed8;
}

.forum-thread-excerpt {
    color: var(--muted);
    font-size: 13px;
    line-height: 1.35;
}

.forum-thread-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 10px;
    color: #475569;
    font-size: 12px;
    font-weight: 800;
}

.forum-thread-detail {
    display: grid;
    gap: 14px;
}

.forum-thread-detail-header {
    padding-bottom: 12px;
    border-bottom: 1px solid #e2e8f0;
}

.forum-thread-detail-header h2 {
    font-size: clamp(22px, 3vw, 30px);
    line-height: 1.1;
    overflow-wrap: anywhere;
}

.forum-thread-detail-header p {
    margin: 7px 0 0;
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
}

.forum-thread-header-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
}

.forum-admin-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
}

.forum-thread-lock {
    border: 1px solid rgba(225, 29, 72, 0.32);
    background: #fff1f2;
    color: #be123c;
}

.forum-post {
    display: grid;
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 12px;
    padding: 14px 0;
    border-top: 1px solid #e2e8f0;
}

.forum-thread-detail .forum-post {
    border-top: 0;
    padding-top: 2px;
}

.forum-post-avatar {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border: 1px solid rgba(124, 58, 237, 0.22);
    border-radius: 12px;
    background: var(--purple-light);
    color: var(--purple-dark);
    font-size: 13px;
    font-weight: 900;
}

.forum-post-body {
    min-width: 0;
}

.forum-post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
    align-items: center;
    margin-bottom: 7px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
}

.forum-post-meta strong {
    color: var(--ink);
    font-size: 13px;
}

.forum-post-body p {
    margin: 0;
    color: #1f2937;
    font-size: 15px;
    line-height: 1.55;
    overflow-wrap: anywhere;
}

.forum-replies {
    display: grid;
    gap: 0;
    margin-top: 6px;
}

.forum-reply-form {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid #e2e8f0;
}

.forum-empty-state {
    display: grid;
    place-items: center;
    min-height: 160px;
    padding: 18px;
    border: 1px dashed #cbd5e1;
    border-radius: 12px;
    background: #f8fafc;
    text-align: center;
}

.forum-empty-state--small {
    min-height: 118px;
}

.forum-empty-state strong {
    color: var(--purple-dark);
    font-size: 16px;
}

.forum-empty-state p {
    max-width: 360px;
    margin: 8px 0 0;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.45;
}

.forum-status {
    min-height: 20px;
    color: #475569;
    font-size: 13px;
    font-weight: 800;
}

.forum-status.is-error {
    color: #b91c1c;
}

.hidden {
    display: none !important;
}

footer {
    border-top: 1px solid var(--border);
    margin-top: 40px;
    padding: 28px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    font-size: 14px;
    text-align: center;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px 16px;
    width: 100%;
}

.footer-copy {
    width: 100%;
}

footer a {
    color: var(--purple-dark);
    text-decoration: none;
    font-weight: 700;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.social-icon {
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--purple-light);
    color: var(--purple-dark);
    font-size: 13px;
    font-weight: 900;
    text-decoration: none;
}

@media (max-width: 820px) {
    header,
    .learning-page-main,
    .learning-nav-column,
    .learning-page-content,
    .learning-side-rail,
    .learning-side-panel {
        width: 100%;
        max-width: 100%;
    }

    header {
        align-items: flex-start;
        gap: 12px;
        flex-direction: column;
    }

    nav a {
        margin-left: 0;
        margin-right: 14px;
    }

    .learning-page-main {
        grid-template-columns: minmax(0, 1fr);
        padding-top: 24px;
    }

    .learning-nav-column {
        position: static;
        order: 1;
    }

    .learning-page-content {
        order: 2;
    }

    .learning-side-rail {
        position: static;
        order: 3;
    }

    .learning-dashboard-top {
        grid-template-columns: 1fr;
    }

    .forum-composer,
    .forum-layout {
        grid-template-columns: 1fr;
    }

    .forum-toolbar,
    .forum-form-footer,
    .forum-section-heading,
    .forum-thread-detail-header {
        align-items: stretch;
        flex-direction: column;
    }

    .forum-refresh-button,
    .forum-submit-button {
        width: 100%;
    }

    .forum-thread-header-actions,
    .forum-admin-actions {
        justify-content: flex-start;
    }

    .forum-thread-list-shell,
    .forum-thread-panel {
        min-height: 0;
    }

    .write-dashboard-header {
        grid-template-columns: 1fr;
    }

    .write-development-chip {
        justify-self: start;
        margin-top: 0;
    }

    .learning-rail {
        position: static;
        max-height: 280px;
    }

    .letters-drill-header,
    .letters-mode-tabs,
    .letters-score-grid,
    .letters-choice-grid,
    .practice-drill-header,
    .practice-mode-tabs,
    .practice-score-grid,
    .practice-choice-grid,
    .write-drill-header,
    .write-mode-tabs,
    .write-score-grid,
    .write-toolbar,
    .write-workspace,
    .sprint-progress-grid {
        grid-template-columns: 1fr;
    }

    .write-workspace::before {
        display: none;
    }

    .write-hsk-tabs {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .practice-hsk-tabs {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .letters-prompt-card {
        grid-template-columns: minmax(0, 1fr) minmax(112px, 128px);
        min-height: 210px;
        column-gap: 10px;
        padding-right: 52px;
    }

    .letters-prompt-main {
        width: min(190px, 100%);
        font-size: clamp(34px, 9vw, 52px);
    }

    .practice-prompt-card {
        min-height: 180px;
    }

    .practice-prompt-listen-content {
        grid-template-columns: minmax(0, 1fr) minmax(120px, 130px);
        gap: 10px;
    }

    .practice-prompt-card .practice-audio-row {
        justify-self: end;
        width: 100%;
        grid-template-columns: 1fr;
    }

    .letters-prompt-sub,
    .letters-feedback {
        display: flex;
        align-items: center;
        justify-content: center;
        line-height: 1.25;
    }

    .letters-prompt-sub {
        min-height: 28px;
    }

    .letters-feedback {
        min-height: 38px;
    }

    .letters-response-slot {
        min-height: 358px;
    }

    .letters-pronunciation-panel .speech-wave-field {
        flex-basis: 100%;
        min-width: 0;
    }

    .hsk-flashcard-grid,
    .hsk-flashcard-choice-grid,
    .hsk-reading-level-grid {
        grid-template-columns: 1fr;
    }

    .hsk-reading-story-link {
        grid-template-columns: 34px minmax(0, 1fr);
    }

    .hsk-reading-story-cta {
        grid-column: 2;
        justify-self: start;
        min-width: 108px;
    }

    .story-reader-page-header {
        grid-template-columns: 1fr;
    }

    .story-reader-back {
        justify-self: start;
    }

    .story-line {
        font-size: 19px;
        padding: 10px 12px;
    }
}