:root {
    --purple: #7c3aed;
    --purple-dark: #6d28d9;
    --purple-light: #faf5ff;
    --border: #ddd6fe;
    --green: #16a34a;
    --green-bright: #22c55e;
    --rose: #e11d48;
    --ink: #111827;
    --muted: #64748b;
    --blog-ink: #111827;
    --blog-muted: #64748b;
    --blog-line: #e5e7eb;
    --blog-purple: var(--purple-dark, #6d28d9);
    --blog-purple-soft: var(--purple-light, #faf5ff);
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    color: var(--blog-ink);
    background: linear-gradient(180deg, var(--blog-purple-soft), #ffffff 34%);
}

.blog-main {
    width: min(1600px, calc(100vw - 32px));
    margin: 0 auto;
    padding: 54px 0 24px;
}

.blog-hero {
    max-width: 800px;
    margin: 0 auto 42px;
    text-align: center;
}

.blog-hero h1 {
    color: var(--blog-purple);
    font-size: clamp(36px, 6vw, 56px);
    line-height: 1.05;
    margin: 0 0 16px;
}

.blog-subtitle {
    color: var(--blog-muted);
    font-size: 20px;
    line-height: 1.6;
    margin: 0;
}

.article-level-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    max-width: 1240px;
    margin: 0 auto;
}

.article-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);
}

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

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

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

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

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

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

.blog-horizontal-ad {
    position: relative;
    display: grid;
    grid-column: 1 / -1;
    place-items: center;
    min-height: 110px;
    border: 1px dashed #c4b5fd;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #faf5ff);
    color: var(--blog-muted);
    font-size: 11px;
    font-weight: 900;
    text-align: center;
    text-transform: uppercase;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.78);
}

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

.article-level-badge,
.article-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;
}

.article-total {
    flex: 0 0 auto;
    color: #475569;
}

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

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

.article-title-list {
    display: grid;
    gap: 8px;
    margin-top: 2px;
}

.article-title-link {
    position: relative;
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr) 70px;
    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) scale(1);
    transition:
        transform 0.16s cubic-bezier(.2, .8, .2, 1),
        border-color 0.14s ease,
        background 0.14s ease,
        box-shadow 0.14s ease;
}

.article-title-link:hover,
.article-title-link:focus-visible {
    border-color: #7c3aed;
    box-shadow: 0 8px 18px rgba(88, 28, 135, 0.14);
    transform: translateY(-2px) scale(1.005);
    outline: none;
}

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

.article-index {
    display: inline-grid;
    place-items: center;
    width: 30px;
    height: 30px;
    border-radius: 8px;
    background: linear-gradient(135deg, #7c3aed, #a855f7);
    color: #ffffff;
    font-size: 12px;
    font-weight: 900;
}

.article-title-text {
    display: grid;
    gap: 3px;
    min-width: 0;
}

.article-title-text strong {
    color: #111827;
    font-size: 14px;
    line-height: 1.25;
}

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

.article-cta {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 34px;
    padding: 6px 8px;
    border: 1px solid #9ca3af;
    border-radius: 8px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: #111827;
    font-size: 12px;
    font-weight: 900;
    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;
}

.article-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;
}

.article-title-link:hover .article-cta,
.article-title-link:focus-visible .article-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);
}

.article-title-link:hover .article-cta::after,
.article-title-link:focus-visible .article-cta::after {
    left: 140%;
}

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

.blog-article-shell {
    max-width: none;
}

.blog-article-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-bottom: 22px;
}

.blog-back-link,
.blog-install-extension-button {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 10px 14px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 13px;
    font-weight: 900;
    line-height: 1;
    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;
}

.blog-back-link::after,
.blog-install-extension-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;
}

.blog-back-link {
    min-width: 92px;
    border: 1px solid #15803d;
    background: linear-gradient(180deg, #22c55e, #16a34a);
    color: #ffffff;
}

.blog-back-link:hover,
.blog-back-link: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);
}

.blog-back-link:hover::after,
.blog-back-link:focus-visible::after,
.blog-install-extension-button:hover::after,
.blog-install-extension-button:focus-visible::after {
    left: 140%;
}

.blog-back-link:active,
.blog-install-extension-button:active {
    box-shadow: 0 4px 12px rgba(88, 28, 135, 0.12);
    opacity: 0.9;
    transform: translateY(0) scale(0.985);
}

.blog-install-extension-button {
    gap: 8px;
    width: auto;
    max-width: max-content;
    border: 1px solid #9ca3af;
    border-radius: 13px;
    background: linear-gradient(180deg, #e5e7eb, #cbd5e1);
    color: #111827;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    animation: installExtensionIdleBump 2s ease-in-out infinite;
}

.blog-install-extension-button:hover,
.blog-install-extension-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);
}

.blog-article-meta {
    justify-content: flex-start;
    margin-bottom: 14px;
}

.blog-article-shell h1 {
    color: var(--blog-purple);
    font-size: clamp(34px, 6vw, 54px);
    line-height: 1.05;
    margin: 0 0 10px;
}

.blog-article-chinese-title {
    color: var(--blog-muted);
    font-size: 24px;
    font-weight: 900;
    line-height: 1.35;
    margin: 0 0 28px;
}

.blog-article-reading-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 28px;
    align-items: start;
}

.blog-article-columns {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 20px;
    align-items: stretch;
    min-width: 0;
}

.blog-article-side-ad {
    position: sticky;
    top: 96px;
    display: grid;
    place-items: center;
    min-height: 600px;
    border: 1px dashed #c4b5fd;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #faf5ff);
    color: var(--blog-muted);
    font-size: 11px;
    font-weight: 900;
    text-align: center;
    text-transform: uppercase;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.78);
}

.blog-article-side-ad span {
    writing-mode: vertical-rl;
    letter-spacing: 0.08em;
}

.blog-article-panel {
    min-width: 0;
    padding: 22px;
    border: 3px solid #94a3b8;
    border-radius: 12px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.1);
}

.blog-article-chinese {
    border-color: #22c55e;
    background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

.blog-article-english {
    border-color: #3b82f6;
    background: linear-gradient(180deg, #ffffff, #eff6ff);
}

.blog-article-panel h2 {
    color: #111827;
    font-size: 24px;
    line-height: 1.2;
    margin: 0 0 14px;
}

.blog-article-panel p {
    color: #374151;
    font-size: 18px;
    line-height: 1.75;
    margin: 0;
}

.blog-article-panel p + p {
    margin-top: 16px;
}

.blog-article-chinese p {
    color: #111827;
    font-size: 22px;
    line-height: 2;
}

.article-map-term {
    border-radius: 6px;
    padding: 1px 3px;
    cursor: pointer;
    transition: background 0.12s ease, color 0.12s ease, box-shadow 0.12s ease;
}

.article-map-block {
    display: inline;
}

.blog-article-english .article-map-term {
    cursor: default;
}

.blog-article-chinese .article-map-term:hover,
.article-map-term.is-highlighted {
    background: #fef3c7;
    color: #111827;
    box-shadow: inset 0 0 0 1px rgba(245, 158, 11, 0.36);
}

.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;
}

.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 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 installExtensionIdleBump {
    0%, 74%, 100% {
        transform: scale(1);
    }
    82% {
        transform: scale(1.045);
    }
    90% {
        transform: scale(0.985);
    }
}

@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);
    }
}

@media (max-width: 820px) {
    .article-level-grid {
        grid-template-columns: 1fr;
    }

    .blog-article-columns {
        grid-template-columns: 1fr;
    }

    .article-title-link {
        grid-template-columns: 34px minmax(0, 1fr);
    }

    .article-cta {
        grid-column: 2;
        justify-self: start;
    }
}

@media (max-width: 1180px) {
    .blog-article-reading-layout {
        grid-template-columns: 1fr;
    }

    .blog-article-side-ad {
        position: static;
        min-height: 120px;
    }

    .blog-article-side-ad span {
        writing-mode: horizontal-tb;
        letter-spacing: 0;
    }
}

@media (min-width: 821px) and (max-width: 1100px) {
    .article-level-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}