/* ========================================
   我的书架 — 暗色主题样式
   ======================================== */

:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d2e;
    --bg-card: #222639;
    --bg-card-hover: #2a2f48;
    --text-primary: #e8eaf0;
    --text-secondary: #9ca3b8;
    --text-muted: #6b7394;
    --accent: #7c6aef;
    --accent-glow: rgba(124, 106, 239, 0.3);
    --accent-light: #a78bfa;
    --reading: #34d399;
    --read: #60a5fa;
    --to-read: #fbbf24;
    --paper: #f97316;
    --ebook: #06b6d4;
    --border: rgba(255, 255, 255, 0.06);
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 40%, #4c1d95 100%);
    padding: 3rem 1.5rem 2.5rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 50%, rgba(124, 106, 239, 0.15) 0%, transparent 60%),
                radial-gradient(circle at 80% 30%, rgba(167, 139, 250, 0.1) 0%, transparent 50%);
}

.hero-inner {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.4rem;
    background: linear-gradient(to right, #e0e7ff, #c4b5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    color: rgba(255,255,255,0.5);
    font-size: 1rem;
    font-weight: 300;
}

/* Stats Bar */
.stats-bar {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.2rem 1rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    min-width: 80px;
    transition: transform var(--transition);
}

.stat:hover {
    transform: translateY(-2px);
}

.stat-num {
    font-size: 1.6rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat--reading .stat-num { color: var(--reading); }
.stat--read .stat-num { color: var(--read); }
.stat--to-read .stat-num { color: var(--to-read); }
.stat--paper .stat-num { color: var(--paper); }
.stat--ebook .stat-num { color: var(--ebook); }

/* Navigation */
.view-nav {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--bg-primary);
}

.view-btn, .filter-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.5rem 1.2rem;
    border-radius: 999px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

.view-btn:hover, .filter-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.view-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    box-shadow: 0 0 16px var(--accent-glow);
}

.filter-btn.active {
    background: rgba(124, 106, 239, 0.15);
    border-color: var(--accent);
    color: var(--accent-light);
}

.filter-nav {
    display: flex;
    justify-content: center;
    gap: 0.4rem;
    padding: 0 1rem 1rem;
    flex-wrap: wrap;
}

.filter-nav.hidden {
    display: none;
}

/* Book Grid */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.2rem;
    padding: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* Book Card (Book Wall Style) */
.book-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.3);
    border-color: var(--accent);
}

.card-cover-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1.43; /* Standard book proportion */
    background: var(--bg-secondary);
    overflow: hidden;
}

.card-cover {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.card-scores-container {
    padding: 0.6rem;
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    background: var(--bg-card);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 2;
}

.card-hover-details {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: rgba(15, 15, 20, 0.92);
    backdrop-filter: blur(8px);
    color: #eee;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 3;
    overflow-y: auto;
    box-sizing: border-box;
}

.book-card:hover .card-hover-details {
    opacity: 1;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
}

.card-priority {
    color: #fbbf24;
    font-size: 0.9rem;
    margin-left: 0.4rem;
    vertical-align: middle;
}

.card-group {
    font-size: 0.72rem;
    color: var(--accent-light);
    background: rgba(124, 106, 239, 0.15);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    align-self: flex-start;
    margin-bottom: 0.2rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.card-meta {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.card-rating.personal {
    font-size: 0.95rem;
    color: var(--to-read);
    letter-spacing: 0.08em;
}

.card-scores {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.score {
    font-size: 0.78rem;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition);
    background: var(--bg-secondary) !important;
    border: 1px solid var(--border) !important;
    color: var(--text-primary) !important;
}

a.score:hover {
    filter: brightness(1.2);
    transform: translateY(-1px);
}

.score.douban {
    color: #4ade80 !important;
}

.score.goodreads {
    color: #60a5fa !important;
}

.card-title-en {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: serif;
    margin-top: -0.2rem;
    line-height: 1.3;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
}

.tag {
    font-size: 0.72rem;
    padding: 0.15rem 0.5rem;
    background: rgba(124, 106, 239, 0.1);
    color: var(--accent-light);
    border-radius: 999px;
    border: 1px solid rgba(124, 106, 239, 0.15);
}

.card-notes {
    font-size: 0.82rem;
    color: var(--text-muted);
    font-style: italic;
    border-left: 2px solid var(--accent);
    padding-left: 0.6rem;
}

.card-dates {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.card-format {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: auto;
    padding-top: 0.4rem;
    border-top: 1px solid var(--border);
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}

/* Group Overview */
#group-overview {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

.group-section {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.group-section-title {
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border);
    padding-bottom: 0.5rem;
}

.group-count {
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: normal;
}

.group-covers {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tiny-cover {
    height: 110px;
    border-radius: 4px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: transform var(--transition);
    object-fit: contain;
    background: var(--bg-secondary);
    padding: 2px;
    box-sizing: border-box;
}

.tiny-cover:hover {
    transform: scale(1.15);
    z-index: 10;
}


/* Responsive */
@media (max-width: 640px) {
    .hero h1 { font-size: 1.8rem; }
    .stats-bar { gap: 0.3rem; padding: 0.8rem 0.5rem; }
    .stat { min-width: 60px; padding: 0.4rem 0.6rem; }
    .stat-num { font-size: 1.2rem; }
    .book-grid { grid-template-columns: 1fr; padding: 1rem; }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.book-card {
    animation: fadeIn 0.4s ease both;
}

.book-card:nth-child(2) { animation-delay: 0.05s; }
.book-card:nth-child(3) { animation-delay: 0.1s; }
.book-card:nth-child(4) { animation-delay: 0.15s; }
.book-card:nth-child(5) { animation-delay: 0.2s; }
.book-card:nth-child(6) { animation-delay: 0.25s; }