:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --bg-hover: #1f2b47;
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --accent: #e74c3c;
  --accent-hover: #ff6b6b;
  --accent-blue: #4a9eff;
  --border: #2a2a4a;
  --success: #4ade80;
  --warning: #fbbf24;
  --tip-bg: #1a2f1a;
  --tip-border: #2d5a2d;
  --warning-bg: #2f2a1a;
  --warning-border: #5a502d;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg-primary); color: var(--text-primary); line-height: 1.6; }
.site-header { background: var(--bg-secondary); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.header-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text-primary); font-weight: 700; font-size: 1.3rem; }
.logo-icon { width: 36px; height: 36px; background: var(--accent); border-radius: 8px; display: flex; align-items: center; justify-content: center; }
.nav-links { display: flex; gap: 8px; list-style: none; }
.nav-links a { color: var(--text-secondary); text-decoration: none; padding: 8px 14px; border-radius: 6px; font-size: 0.9rem; font-weight: 500; transition: all 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); background: var(--bg-hover); }
.mobile-menu-btn { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.5rem; cursor: pointer; }
.hero { background: var(--bg-secondary); padding: 60px 20px; text-align: center; border-bottom: 1px solid var(--border); }
.hero-inner { max-width: 800px; margin: 0 auto; }
.hero h1 { font-size: 2.8rem; margin-bottom: 16px; background: linear-gradient(90deg, var(--accent), var(--accent-hover)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 1.2rem; color: var(--text-secondary); margin-bottom: 30px; }
.hero-meta { display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; font-size: 0.9rem; color: var(--text-secondary); }
.content { max-width: 1200px; margin: 0 auto; padding: 40px 20px; }
.guide-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; margin: 30px 0; }
.guide-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 24px; text-decoration: none; color: inherit; transition: all 0.2s; display: flex; flex-direction: column; }
.guide-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.15); }
.guide-card-icon { width: 48px; height: 48px; background: var(--bg-hover); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 16px; }
.guide-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.guide-card p { font-size: 0.9rem; color: var(--text-secondary); }
.guide-card-arrow { margin-top: auto; padding-top: 16px; color: var(--accent); font-size: 0.9rem; font-weight: 600; }
.page-layout { max-width: 1200px; margin: 0 auto; display: flex; gap: 30px; padding: 30px 20px; }
.sidebar { width: 260px; flex-shrink: 0; position: sticky; top: 80px; height: fit-content; }
.toc { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }
.toc h3 { font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-secondary); margin-bottom: 16px; }
.toc ul { list-style: none; }
.toc a { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; display: block; padding: 6px 10px; border-radius: 6px; transition: all 0.2s; }
.toc a:hover, .toc a.active { color: var(--accent); background: var(--bg-hover); }
.toc .toc-h3 { padding-left: 20px; font-size: 0.85rem; }
.main-content { flex: 1; min-width: 0; }
.article-header { margin-bottom: 30px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.breadcrumb { display: flex; gap: 8px; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 16px; }
.breadcrumb a { color: var(--accent); text-decoration: none; }
.article-header h1 { font-size: 2.2rem; margin-bottom: 12px; line-height: 1.2; }
.article-meta { display: flex; gap: 16px; font-size: 0.9rem; color: var(--text-secondary); flex-wrap: wrap; }
.article-content h2 { font-size: 1.6rem; margin: 40px 0 16px; color: var(--text-primary); }
.article-content h3 { font-size: 1.2rem; margin: 24px 0 12px; color: var(--text-secondary); }
.article-content p { margin-bottom: 16px; color: var(--text-secondary); }
.article-content ul, .article-content ol { margin: 16px 0; padding-left: 24px; color: var(--text-secondary); }
.article-content li { margin-bottom: 8px; }
.tip-box { background: var(--tip-bg); border: 1px solid var(--tip-border); border-radius: 10px; padding: 20px; margin: 20px 0; }
.tip-box-header { display: flex; align-items: center; gap: 8px; font-weight: 600; color: var(--success); margin-bottom: 10px; }
.warning-box { background: var(--warning-bg); border: 1px solid var(--warning-border); border-radius: 10px; padding: 20px; margin: 20px 0; }
.warning-box-header { display: flex; align-items: center; gap: 8px; font-weight: 600; color: var(--warning); margin-bottom: 10px; }
.data-table { width: 100%; border-collapse: collapse; margin: 20px 0; background: var(--bg-card); border-radius: 10px; overflow: hidden; }
.data-table th { background: var(--bg-hover); padding: 14px 16px; text-align: left; font-weight: 600; color: var(--text-primary); }
.data-table td { padding: 14px 16px; border-top: 1px solid var(--border); color: var(--text-secondary); }
.data-table tr:hover td { background: var(--bg-hover); }
.ad-banner { margin: 20px 0; min-height: 90px; background: var(--bg-card); border: 1px dashed var(--border); display: flex; align-items: center; justify-content: center; color: var(--text-secondary); font-size: 0.85rem; border-radius: 8px; }
.page-nav { display: flex; justify-content: space-between; margin-top: 50px; padding-top: 30px; border-top: 1px solid var(--border); }
.page-nav a { color: var(--text-secondary); text-decoration: none; padding: 12px 20px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; transition: all 0.2s; }
.page-nav a:hover { border-color: var(--accent); color: var(--text-primary); }
.site-footer { background: var(--bg-secondary); border-top: 1px solid var(--border); padding: 40px 20px; text-align: center; color: var(--text-secondary); font-size: 0.9rem; }
.footer-links { display: flex; justify-content: center; gap: 20px; margin-bottom: 16px; flex-wrap: wrap; }
.footer-links a { color: var(--text-secondary); text-decoration: none; }
.footer-links a:hover { color: var(--accent); }
.faq-section { margin-top: 40px; }
.faq-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 20px; margin-bottom: 16px; }
.faq-item h3 { font-size: 1.1rem; margin-bottom: 10px; color: var(--text-primary); }
.faq-item p { color: var(--text-secondary); }
.related-guides { margin-top: 40px; padding: 20px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; }
.related-guides h3 { margin-bottom: 12px; }
.related-guides a { color: var(--accent); text-decoration: none; display: block; margin-bottom: 8px; }
@media (max-width: 900px) { .sidebar { display: none; } .page-layout { flex-direction: column; } }
@media (max-width: 768px) { .nav-links { display: none; } .mobile-menu-btn { display: block; } .hero h1 { font-size: 1.8rem; } .hero-meta { flex-direction: column; gap: 8px; } .guide-grid { grid-template-columns: 1fr; } .article-header h1 { font-size: 1.6rem; } }