/* TransPub — Book Reading Styles */
@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display&family=DM+Sans:opsz,wght@9..40,300;9..40,400;9..40,500;9..40,600;9..40,700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --forest: #174a44;
    --forest-light: #1c5c54;
    --coral: #d83c51;
    --coral-light: #fdf0f1;
    --green: #1f855c;
    --green-light: #eef7f3;
    --teal: #1990a7;
    --teal-light: #eef5f7;
    --sky: #58b2b9;
    --gold: #fec103;
    --blush: #f3bdc3;
    --bg: #fafaf8;
    --bg-card: #ffffff;
    --text: #1a1a2e;
    --text-secondary: #3d3d52;
    --text-muted: #7a7a90;
    --text-light: #a0a0b0;
    --rule: #e8e6e0;
    --font-display: 'DM Serif Display', Georgia, serif;
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-body);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

/* === LAYOUT === */
.container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 28px;
}

/* === HEADER (Book Index) === */
header {
    padding: 56px 0 40px;
    border-bottom: 1.5px solid var(--rule);
    margin-bottom: 36px;
}

header h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 400;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    color: var(--text);
}

.subtitle {
    font-size: 0.88rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* === CHAPTER LIST (Book Index) === */
.chapters-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.chapter-card {
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: 10px;
    padding: 22px 26px;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
    display: grid;
    grid-template-columns: 56px 1fr;
    grid-template-rows: auto auto auto;
    gap: 0 18px;
}

.chapter-card:hover {
    border-color: var(--teal);
    box-shadow: 0 2px 12px rgba(25,144,167,0.08);
    transform: translateY(-1px);
}

.chapter-number {
    grid-row: 1 / 3;
    grid-column: 1;
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--teal);
    padding-top: 2px;
}

.chapter-title {
    grid-column: 2;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
    line-height: 1.4;
}

.chapter-summary {
    grid-column: 2;
    font-size: 0.82rem;
    font-weight: 400;
    color: var(--text-muted);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 10px;
}

.chapter-meta {
    grid-column: 2;
    font-size: 0.76rem;
    color: var(--text-light);
    display: flex;
    gap: 14px;
    align-items: center;
}

.audio-badge {
    color: var(--coral);
    font-weight: 500;
}

/* === CHAPTER DETAIL PAGE === */
.chapter-detail {
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: 12px;
    padding: 40px 44px 48px;
    margin: 32px auto;
    max-width: 780px;
}

.back-link {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--teal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 28px;
    transition: color 0.15s;
}

.back-link:hover {
    color: var(--forest);
}

.chapter-header h1 {
    font-family: var(--font-display);
    font-size: 1.65rem;
    font-weight: 400;
    letter-spacing: -0.015em;
    line-height: 1.3;
    color: var(--text);
    margin-bottom: 24px;
}

/* Summary Box */
.chapter-summary-box {
    background: var(--teal-light);
    padding: 22px 26px;
    border-radius: 10px;
    margin: 0 0 32px;
    border-left: 4px solid var(--teal);
}

.chapter-summary-box h3 {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--teal);
    margin: 0 0 12px;
}

.chapter-summary-box p {
    font-size: 0.9rem;
    line-height: 1.85;
    color: var(--text-secondary);
    white-space: pre-wrap;
}

/* Audio Player */
.audio-player {
    background: var(--forest);
    padding: 20px 24px;
    border-radius: 10px;
    margin: 0 0 32px;
    color: #fff;
}

.audio-player h3 {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--sky);
    margin: 0 0 12px;
}

.audio-player audio {
    width: 100%;
    height: 40px;
    border-radius: 6px;
}

/* Chapter Content — Reading Area */
.chapter-content {
    margin-top: 8px;
    font-size: 1.02rem;
    line-height: 1.9;
    color: var(--text-secondary);
}

.chapter-content h1 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text);
    margin-top: 48px;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--coral);
}

.chapter-content h2 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--text);
    margin-top: 40px;
    margin-bottom: 12px;
}

.chapter-content h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-top: 32px;
    margin-bottom: 10px;
}

.chapter-content p {
    margin: 16px 0;
    text-align: justify;
}

.chapter-content blockquote {
    border-left: 3px solid var(--coral);
    padding: 2px 0 2px 20px;
    margin: 20px 0;
    color: var(--text-muted);
    font-style: italic;
}

.chapter-content ul,
.chapter-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.chapter-content li {
    margin: 6px 0;
}

.chapter-content strong {
    font-weight: 600;
    color: var(--text);
}

.chapter-content em {
    font-style: italic;
}

.chapter-content code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: var(--teal-light);
    padding: 2px 6px;
    border-radius: 4px;
}

/* Bottom navigation */
.chapter-bottom-nav {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1.5px solid var(--rule);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* === BOOKS LIST (Main Index) === */
.books-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.book-card {
    background: var(--bg-card);
    border: 1px solid var(--rule);
    border-radius: 10px;
    padding: 28px 30px;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
    border-left: 4px solid var(--coral);
}

.book-card:hover {
    border-color: var(--teal);
    border-left-color: var(--coral);
    box-shadow: 0 4px 16px rgba(25,144,167,0.08);
    transform: translateY(-2px);
}

.book-title {
    font-family: var(--font-display);
    font-size: 1.35rem;
    font-weight: 400;
    margin-bottom: 12px;
    color: var(--text);
    letter-spacing: -0.01em;
}

.book-meta {
    font-size: 0.82rem;
    color: var(--text-muted);
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

/* === FOOTER === */
footer {
    text-align: center;
    margin-top: 56px;
    padding: 24px 0 32px;
    border-top: 1.5px solid var(--rule);
    font-size: 0.82rem;
    color: var(--text-light);
}

footer a {
    color: var(--teal);
    text-decoration: none;
    font-weight: 500;
}

footer a:hover {
    color: var(--forest);
}

/* === RESPONSIVE === */
@media (max-width: 640px) {
    .container { padding: 0 18px; }

    header { padding: 36px 0 28px; }
    header h1 { font-size: 1.5rem; }

    .chapter-card {
        grid-template-columns: 1fr;
        gap: 4px;
        padding: 18px 20px;
    }

    .chapter-number {
        grid-row: auto;
        grid-column: 1;
        font-size: 0.82rem;
        margin-bottom: 2px;
    }

    .chapter-title { grid-column: 1; }
    .chapter-summary { grid-column: 1; }
    .chapter-meta { grid-column: 1; }

    .chapter-detail {
        padding: 24px 20px 32px;
        margin: 16px auto;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }

    .chapter-header h1 { font-size: 1.3rem; }

    .chapter-content { font-size: 0.95rem; }
}