/* ============================================================
   番茄风向标 — Editorial Luxury Theme
   Direction: Warm literary magazine meets premium dashboard
   Fonts: Playfair Display (display) + Plus Jakarta Sans (UI)
   Palette: Deep warm blacks + amber gold accents
   ============================================================ */

:root {
    /* — Warm Dark Palette — */
    --bg-deep: #0c0a09;
    --bg-surface: #1c1917;
    --bg-elevated: #292524;
    --glass-bg: rgba(28, 25, 23, 0.7);
    --glass-border: rgba(245, 158, 11, 0.08);
    --glass-hover: rgba(245, 158, 11, 0.06);

    /* — Typography Colors — */
    --text-primary: #faf5ef;
    --text-secondary: #a8a29e;
    --text-muted: #78716c;

    /* — Accent: Amber Gold — */
    --accent: #f59e0b;
    --accent-dim: #d97706;
    --accent-glow: rgba(245, 158, 11, 0.2);
    --accent-soft: rgba(245, 158, 11, 0.08);

    /* — Semantic — */
    --green: #4ade80;
    --red: #ef4444;
    --amber: #fbbf24;

    /* — Spacing & Radius — */
    --radius-xl: 20px;
    --radius-lg: 14px;
    --radius-md: 8px;
    --radius-sm: 5px;

    --sidebar-w: 260px;

    /* — Fonts — */
    --font-display: 'Playfair Display', 'Noto Serif SC', Georgia, serif;
    --font-body: 'Plus Jakarta Sans', 'Noto Sans SC', -apple-system, sans-serif;
    --font-serif: 'Noto Serif SC', 'Playfair Display', Georgia, serif;
}

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

body {
    font-family: var(--font-body);
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
    /* Subtle noise texture via SVG */
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.015'/%3E%3C/svg%3E");
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: rgba(245, 158, 11, 0.2);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(245, 158, 11, 0.35);
}

/* ===== Layout ===== */
.app-container { display: flex; min-height: 100vh; }

/* ===== Sidebar ===== */
.sidebar {
    width: var(--sidebar-w);
    flex-shrink: 0;
    background: var(--bg-surface);
    border-right: 1px solid rgba(245, 158, 11, 0.06);
    padding: 32px 0;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 0 24px;
    margin-bottom: 28px;
}

.sidebar-header h1 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: -0.02em;
    margin-bottom: 6px;
}

.update-date {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.sidebar-subtitle {
    font-size: 0.78rem;
    color: var(--accent-dim);
    font-weight: 600;
    margin-bottom: 4px;
    letter-spacing: 0.5px;
}

.category-nav ul { list-style: none; padding: 0 10px; }

.category-nav li {
    padding: 11px 16px;
    margin-bottom: 2px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.88rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    position: relative;
}

.category-nav li:hover {
    background: var(--glass-hover);
    color: var(--text-primary);
    transform: translateX(4px);
}

.category-nav li.active {
    background: var(--accent-soft);
    color: var(--accent);
    font-weight: 600;
}

.category-nav li.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 25%;
    bottom: 25%;
    width: 3px;
    background: var(--accent);
    border-radius: 0 2px 2px 0;
}

.cat-badge {
    font-size: 0.65rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 700;
    flex-shrink: 0;
    letter-spacing: 0.3px;
}

.cat-badge.new {
    background: rgba(74, 222, 128, 0.1);
    color: var(--green);
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    min-width: 0;
    padding: 32px 36px;
}

.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
}

.main-header h2 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

/* ===== Date Presets ===== */
.date-presets {
    display: inline-flex;
    gap: 4px;
    background: var(--bg-elevated);
    border-radius: 100px;
    padding: 3px;
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.preset-btn {
    padding: 5px 14px;
    border-radius: 100px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
    white-space: nowrap;
}

.preset-btn:hover {
    color: var(--text-secondary);
}

.preset-btn.active {
    background: var(--accent);
    color: #0c0a09;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.25);
}

/* ===== Date Picker ===== */
.header-left { flex-shrink: 0; }
.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.date-picker-wrap {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    position: relative;
}

.date-picker-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border-radius: 100px;
    font-size: 0.82rem;
    font-weight: 600;
    background: var(--bg-elevated);
    border: 1px solid rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
    font-family: var(--font-body);
    white-space: nowrap;
}

.date-picker-btn:hover {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: rgba(245, 158, 11, 0.2);
    transform: translateY(-1px);
}

.date-picker-btn .date-icon {
    font-size: 0.9rem;
}

.date-nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.06);
    background: var(--bg-elevated);
    color: var(--text-muted);
    font-size: 0.65rem;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: var(--font-body);
}

.date-nav-btn:hover:not(:disabled) {
    background: var(--accent-soft);
    color: var(--accent);
    border-color: rgba(245, 158, 11, 0.2);
}

.date-nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.date-input-hidden {
    position: absolute;
    top: 100%;
    right: 0;
    opacity: 0;
    width: 0;
    height: 0;
    border: none;
    pointer-events: none;
}

/* Active date indicator when viewing historical data */
.date-picker-btn.is-historical {
    background: rgba(245, 158, 11, 0.12);
    color: var(--accent);
    border-color: rgba(245, 158, 11, 0.25);
}

.mobile-menu-btn {
    display: none;
    background: var(--bg-elevated);
    border: 1px solid var(--glass-border);
    color: var(--accent);
    font-size: 1.2rem;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background 0.2s;
}

.mobile-menu-btn:hover {
    background: var(--accent-soft);
}

/* ===== Trend Panel ===== */
.trend-panel {
    margin-bottom: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.trend-stats {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.stat-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--bg-elevated);
    border: 1px solid rgba(255, 255, 255, 0.04);
    white-space: nowrap;
    transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
    letter-spacing: 0.2px;
}

.stat-chip:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.stat-chip.up { color: var(--green); border-color: rgba(74, 222, 128, 0.15); }
.stat-chip.down { color: var(--red); border-color: rgba(239, 68, 68, 0.15); }
.stat-chip.new-entry { color: var(--amber); border-color: rgba(251, 191, 36, 0.15); }

/* ===== AI Summary — Editorial Card ===== */
.trend-ai {
    position: relative;
    background: var(--bg-surface);
    border: 1px solid rgba(245, 158, 11, 0.1);
    border-radius: var(--radius-xl);
    padding: 28px 32px;
    min-height: 60px;
    overflow: hidden;
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.03) inset,
        0 8px 32px rgba(0, 0, 0, 0.2);
}

/* Gold accent line — top edge */
.trend-ai::before {
    content: '';
    position: absolute;
    top: 0;
    left: 32px;
    right: 32px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-dim), transparent);
    opacity: 0.5;
}

/* Decorative corner flourish */
.trend-ai::after {
    content: '✦';
    position: absolute;
    top: 14px;
    right: 20px;
    font-size: 0.7rem;
    color: var(--accent);
    opacity: 0.3;
}

.ai-label {
    font-family: var(--font-body);
    font-size: 0.7rem;
    color: var(--accent-dim);
    margin-bottom: 16px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.ai-content {
    font-size: 0.9rem;
    line-height: 2;
    color: var(--text-secondary);
    font-family: var(--font-serif);
    white-space: pre-wrap;
    user-select: text;
}

/* Markdown: bold keywords */
.ai-content strong {
    color: #0c0a09;
    font-weight: 700;
    background: var(--accent);
    padding: 2px 6px;
    border-radius: 3px;
    box-shadow: 0 1px 4px rgba(245, 158, 11, 0.3);
}

/* Markdown: italic emphasis */
.ai-content em {
    color: var(--green);
    font-style: italic;
    font-weight: 500;
}

.ai-content .cursor {
    display: inline-block;
    width: 2px;
    height: 1.1em;
    background: var(--accent);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: blink 0.8s steps(1) infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.ai-loading {
    color: var(--text-muted);
    font-style: italic;
}

/* ===== Books Grid ===== */
.books-waterfall {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 22px;
    align-items: start;
}

/* ===== Book Card ===== */
.book-card {
    background: var(--bg-surface);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
    position: relative;
    display: block;
    text-decoration: none;
    color: inherit;
    user-select: text;
    -webkit-user-select: text;
}

.book-card:hover {
    transform: translateY(-6px);
    box-shadow:
        0 12px 40px rgba(0, 0, 0, 0.4),
        0 0 0 1px rgba(245, 158, 11, 0.12);
    border-color: rgba(245, 158, 11, 0.1);
}

.book-cover {
    width: 100%;
    overflow: hidden;
    position: relative;
    background: var(--bg-elevated);
}

.book-cover img {
    width: 100%;
    display: block;
    transition: transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.book-card:hover .book-cover img {
    transform: scale(1.04);
}

/* Cover gradient overlay for readability */
.book-cover::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(to top, var(--bg-surface), transparent);
    pointer-events: none;
}

.no-cover {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 180px;
    color: var(--text-muted);
    font-size: 0.82rem;
    font-family: var(--font-serif);
    font-style: italic;
}

.book-info {
    padding: 18px 18px 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.book-title {
    font-family: var(--font-serif);
    font-size: 1.02rem;
    font-weight: 700;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
    user-select: text;
    letter-spacing: 0.02em;
}

.book-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.book-author {
    font-weight: 600;
    color: var(--accent-dim);
    user-select: text;
}

.book-reads {
    background: var(--bg-elevated);
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 0.72rem;
    white-space: nowrap;
    color: var(--text-muted);
    font-weight: 500;
}

.book-intro {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.7;
    user-select: text;
}

/* ===== Rank Badge ===== */
.book-rank {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(12, 10, 9, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: var(--text-secondary);
    font-weight: 800;
    padding: 4px 12px;
    border-radius: var(--radius-md);
    font-size: 0.78rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    z-index: 10;
    font-family: var(--font-body);
    letter-spacing: 0.5px;
}

/* Gold, Silver, Bronze — editorial tones */
.rank-1 {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #0c0a09;
    border: none;
    box-shadow: 0 2px 12px rgba(245, 158, 11, 0.3);
}

.rank-2 {
    background: linear-gradient(135deg, #d6d3d1, #a8a29e);
    color: #0c0a09;
    border: none;
}

.rank-3 {
    background: linear-gradient(135deg, #c2956a, #92643a);
    color: #faf5ef;
    border: none;
}

/* ===== Change Indicator ===== */
.book-change {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 10px;
    border-radius: var(--radius-md);
    font-size: 0.7rem;
    font-weight: 700;
    z-index: 10;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.3px;
}

.book-change.up {
    background: rgba(4, 30, 15, 0.8);
    color: var(--green);
    border-color: rgba(74, 222, 128, 0.15);
}

.book-change.down {
    background: rgba(40, 8, 8, 0.8);
    color: var(--red);
    border-color: rgba(239, 68, 68, 0.15);
}

.book-change.new {
    background: rgba(40, 30, 5, 0.8);
    color: var(--amber);
    border-color: rgba(251, 191, 36, 0.15);
}

/* ===== Copy Button ===== */
.book-copy-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(245, 158, 11, 0.3);
    background: rgba(245, 158, 11, 0.08);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
    user-select: none;
}

.book-copy-btn:hover {
    background: var(--accent);
    color: #0c0a09;
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.25);
}

.book-copy-btn.copied {
    background: rgba(74, 222, 128, 0.1);
    color: var(--green);
    border-color: rgba(74, 222, 128, 0.2);
}

/* ===== Empty State ===== */
.empty-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    background: var(--bg-surface);
    border: 1px dashed rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    text-align: center;
}

.empty-state p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
}

.empty-state .empty-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== Toast ===== */
.copy-toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    color: var(--green);
    padding: 12px 28px;
    border-radius: 100px;
    font-size: 0.82rem;
    font-weight: 600;
    border: 1px solid rgba(74, 222, 128, 0.15);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
    z-index: 9999;
    letter-spacing: 0.3px;
}

.copy-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .books-waterfall { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0; top: 0;
        transform: translateX(-100%);
        width: 280px;
        height: 100vh;
        z-index: 1000;
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.5);
    }

    .sidebar.open { transform: translateX(0); }

    .sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(12, 10, 9, 0.6);
        backdrop-filter: blur(4px);
        z-index: 999;
        display: none;
    }

    .sidebar-overlay.show { display: block; }

    .mobile-menu-btn { display: block; }

    .main-content { padding: 20px 16px; }

    .books-waterfall { grid-template-columns: 1fr; }

    .trend-stats { gap: 8px; }

    .main-header h2 { font-size: 1.4rem; }

    .main-header {
        flex-wrap: wrap;
        gap: 12px;
    }

    .header-right {
        width: 100%;
        justify-content: space-between;
    }

    .date-picker-btn {
        font-size: 0.78rem;
        padding: 6px 12px;
    }

    .trend-ai { padding: 20px; border-radius: var(--radius-lg); }

    .trend-ai::before { left: 20px; right: 20px; }
}

@media (max-width: 480px) {
    .main-header h2 { font-size: 1.2rem; }
    .trend-ai { padding: 16px 18px; }
    .stat-chip { font-size: 0.75rem; padding: 5px 12px; }
    .date-nav-btn { width: 26px; height: 26px; font-size: 0.6rem; }
    .date-picker-btn { font-size: 0.72rem; padding: 5px 10px; }
}