/* ========== Reset & Base ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
    --primary: #ff6b35;
    --primary-dark: #e55a2b;
    --bg: #0f0f0f;
    --bg-card: #1a1a2e;
    --bg-dark: #0a0a1a;
    --text: #e8e8e8;
    --text-dim: #999;
    --border: #2a2a3e;
    --accent: #ffd166;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0,0,0,0.3);
}
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--accent); }
.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }

/* ========== Navbar ========== */
.navbar {
    position: sticky; top: 0; z-index: 100;
    background: rgba(15,15,15,0.92); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.logo { font-size: 22px; font-weight: 800; color: var(--text); }
.logo .dot { color: var(--primary); }
.nav-links { display: flex; gap: 24px; }
.nav-links a { color: var(--text-dim); font-size: 14px; transition: color 0.2s; }
.nav-links a:hover { color: var(--primary); }
.mobile-menu-btn { display: none; background: none; border: none; color: var(--text); font-size: 24px; cursor: pointer; }

/* ========== Hero ========== */
.hero {
    padding: 80px 0 60px;
    text-align: center;
    background: linear-gradient(180deg, var(--bg) 0%, #1a1a2e 100%);
}
.hero h1 {
    font-size: 42px; font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p { color: var(--text-dim); font-size: 18px; margin-top: 12px; }

/* ========== Section ========== */
.section { padding: 60px 0; }
.section-dark { background: var(--bg-dark); }
.section-title {
    font-size: 24px; font-weight: 700; margin-bottom: 32px;
    padding-left: 12px; border-left: 4px solid var(--primary);
}

/* ========== Book Card ========== */
.book-grid { display: grid; gap: 24px; }
.book-card {
    display: flex; gap: 24px;
    background: var(--bg-card); border-radius: var(--radius);
    padding: 24px; border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
}
.book-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.book-cover {
    width: 140px; min-width: 140px; height: 190px;
    border-radius: 8px; overflow: hidden;
    background: linear-gradient(135deg, #2d1b69, #1a3a5c);
    display: flex; align-items: center; justify-content: center;
}
.cover-inner {
    display: flex; flex-direction: column; align-items: center;
    gap: 8px; color: #fff;
}
.cover-title { font-size: 22px; font-weight: 800; }
.cover-author { font-size: 13px; color: rgba(255,255,255,0.7); }
.book-info { flex: 1; display: flex; flex-direction: column; gap: 8px; }
.book-info h3 { font-size: 20px; font-weight: 700; }
.book-info .author { color: var(--primary); font-size: 14px; }
.book-info .desc { color: var(--text-dim); font-size: 14px; line-height: 1.7; }
.book-meta { display: flex; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--text-dim); }

/* ========== Tags ========== */
.tag {
    display: inline-block; padding: 2px 10px; border-radius: 20px;
    font-size: 12px; font-weight: 600;
}
.tag-hot { background: rgba(255,107,53,0.2); color: var(--primary); }
.tag-ongoing { background: rgba(255,209,102,0.2); color: var(--accent); }
.tag-complete { background: rgba(76,175,80,0.2); color: #4caf50; }

/* ========== Button ========== */
.btn {
    display: inline-block; padding: 8px 24px; margin-top: 4px;
    background: var(--primary); color: #fff; border-radius: 8px;
    font-size: 14px; font-weight: 600; text-align: center;
    transition: background 0.2s; align-self: flex-start;
}
.btn:hover { background: var(--primary-dark); color: #fff; }

/* ========== Author ========== */
.author-card {
    display: flex; gap: 32px;
    background: var(--bg-card); border-radius: var(--radius);
    padding: 32px; border: 1px solid var(--border);
}
.author-avatar {
    width: 80px; height: 80px; min-width: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex; align-items: center; justify-content: center;
    font-size: 32px; font-weight: 900; color: #fff;
}
.author-detail h3 { font-size: 22px; font-weight: 700; }
.author-bio { color: var(--text-dim); font-size: 14px; margin-top: 8px; }
.author-works { margin-top: 24px; }
.work-item {
    display: flex; gap: 16px; padding: 16px 0;
    border-top: 1px solid var(--border);
}
.work-cover-small {
    width: 80px; min-width: 80px; height: 110px;
    border-radius: 6px;
    background: linear-gradient(135deg, #2d1b69, #1a3a5c);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 14px; font-weight: 700;
    writing-mode: vertical-rl;
}
.work-info h4 { font-size: 16px; font-weight: 600; }
.work-info p { font-size: 13px; color: var(--text-dim); margin-top: 4px; }
.work-desc { font-size: 13px; color: var(--text-dim); margin-top: 6px; line-height: 1.6; }

/* ========== Category Tabs ========== */
.category-tabs { display: flex; gap: 12px; margin-bottom: 24px; flex-wrap: wrap; }
.tab {
    padding: 8px 20px; border-radius: 20px; border: 1px solid var(--border);
    background: transparent; color: var(--text-dim); cursor: pointer;
    font-size: 14px; transition: all 0.2s;
}
.tab.active, .tab:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ========== Book List ========== */
.book-list { display: grid; gap: 12px; }
.book-item {
    display: flex; align-items: center; gap: 16px;
    background: var(--bg-card); border-radius: var(--radius);
    padding: 16px 20px; border: 1px solid var(--border);
    transition: transform 0.15s;
}
.book-item:hover { transform: translateX(4px); }
.book-item-rank {
    font-size: 20px; font-weight: 900; min-width: 32px;
    color: var(--text-dim);
}
.book-item-rank.top3 { color: var(--primary); }
.book-item-info { flex: 1; }
.book-item-info h4 { font-size: 15px; font-weight: 600; }
.book-item-info p { font-size: 13px; color: var(--text-dim); }
.book-item-score { font-size: 18px; font-weight: 800; color: var(--accent); }

/* ========== Footer ========== */
.footer { background: var(--bg-dark); border-top: 1px solid var(--border); padding: 40px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-brand p { color: var(--text-dim); font-size: 13px; margin-top: 4px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-dim); font-size: 13px; }
.footer-copy { font-size: 12px; color: var(--text-dim); }

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 56px; left: 0; right: 0; background: var(--bg); padding: 16px 20px; border-bottom: 1px solid var(--border); }
    .mobile-menu-btn { display: block; }
    .hero h1 { font-size: 28px; }
    .hero p { font-size: 15px; }
    .book-card { flex-direction: column; }
    .book-cover { width: 100%; height: 160px; }
    .author-card { flex-direction: column; align-items: center; text-align: center; }
    .work-item { flex-direction: column; align-items: center; text-align: center; }
    .footer-inner { flex-direction: column; text-align: center; }
}