:root{--ink:#1a1a2e;--ink-light:#475569;--bg:#fff;--accent:#3b82f6;--accent-dark:#1e40af;--surface:#f8fafc;--border:#e2e8f0;--radius:12px;--shadow-lg:0 10px 40px rgba(0,0,0,.08)}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:17px}
body{font-family:"PingFang SC","Microsoft YaHei",-apple-system,sans-serif;line-height:1.8;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
.progress-bar{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,var(--accent),#8b5cf6);z-index:999;transition:width .1s linear}
article{max-width:680px;margin:0 auto;padding:40px 24px 60px}
.hero{margin:-40px -24px 40px;overflow:hidden;border-radius:0 0 24px 24px}
.hero img{width:100%;display:block}
.hero-overlay{position:absolute;bottom:0;left:0;right:0;padding:60px 40px 30px;background:linear-gradient(transparent,rgba(0,0,0,.7))}
.hero-overlay .category{display:inline-block;background:rgba(255,255,255,.2);backdrop-filter:blur(8px);color:#fff;padding:4px 14px;border-radius:20px;font-size:.8em;margin-bottom:12px}
.hero-overlay h1{color:#fff!important;border:none!important;font-size:2em!important;margin:0!important;text-shadow:0 2px 8px rgba(0,0,0,.3)}
.meta-bar{display:flex;gap:16px;flex-wrap:wrap;align-items:center;padding:16px 0;border-bottom:1px solid var(--border);margin-bottom:32px;font-size:.9em;color:var(--ink-light)}
.toc{background:var(--surface);border-radius:var(--radius);padding:24px 28px;margin:32px 0;border:1px solid var(--border)}
.toc-title{font-weight:700;font-size:.85em;text-transform:uppercase;letter-spacing:.1em;color:var(--ink-light);margin-bottom:12px}
.toc ol{list-style:none;counter-reset:toc}
.toc li{counter-increment:toc;padding:4px 0}
.toc li::before{content:counter(toc,decimal-leading-zero);color:var(--accent);font-weight:700;font-size:.8em;margin-right:10px}
.toc a{color:var(--ink);text-decoration:none;font-size:.95em}
.toc a:hover{color:var(--accent)}
h1{font-size:1.8em;margin:48px 0 20px;border-bottom:2px solid var(--ink);padding-bottom:12px}
h2{font-size:1.35em;margin:40px 0 16px;color:var(--accent-dark);padding-left:16px;border-left:4px solid var(--accent)}
h3{font-size:1.1em;margin:28px 0 12px;color:#334155;font-weight:700}
p{margin:0 0 1.2em;text-align:justify}
strong{color:#0f172a;font-weight:700}
a{color:var(--accent);text-decoration:none;border-bottom:1px solid rgba(59,130,246,.3)}
a:hover{border-bottom-color:var(--accent)}
.card{background:linear-gradient(135deg,#f0f9ff,#e0f2fe);border-radius:var(--radius);padding:24px 28px;margin:28px 0;border:1px solid #bae6fd;overflow:hidden}
.card h3{margin-top:0;color:#0369a1}
blockquote{margin:28px 0;padding:24px 28px;background:#fffbeb;border-radius:var(--radius);border-left:4px solid #f59e0b}
blockquote p{font-style:italic;color:#92400e;margin:0}
.data-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin:28px 0}
.data-item{background:var(--surface);border-radius:var(--radius);padding:20px;text-align:center;border:1px solid var(--border);transition:transform .2s}
.data-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.data-item .num{font-size:2em;font-weight:800;background:linear-gradient(135deg,var(--accent),#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.data-item .label{font-size:.8em;color:var(--ink-light);margin-top:4px}
.checklist{list-style:none;padding:0}
.checklist li{padding:8px 0 8px 28px;position:relative;border-bottom:1px solid var(--border)}
.checklist li:last-child{border-bottom:none}
.checklist li::before{content:"✓";position:absolute;left:0;top:8px;width:18px;height:18px;background:#10b981;color:#fff;border-radius:50%;font-size:10px;display:flex;align-items:center;justify-content:center;font-weight:700}
hr{border:none;margin:48px 0;text-align:center}
hr::after{content:"◆ ◆ ◆";color:var(--border);font-size:.8em;letter-spacing:1em}
.author-card{display:flex;gap:16px;align-items:center;background:var(--surface);border-radius:var(--radius);padding:20px;margin:40px 0;border:1px solid var(--border)}
.author-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#8b5cf6);display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.2em;flex-shrink:0}
.share-bar{display:flex;gap:10px;margin:40px 0;padding:20px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.share-btn{flex:1;text-align:center;padding:10px;border-radius:8px;font-size:.85em;font-weight:600;cursor:pointer;border:1px solid var(--border);background:var(--surface);transition:all .2s;text-decoration:none;color:var(--ink)}
.share-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent)}
.related{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin:40px 0}
.related-card{background:var(--surface);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:transform .2s;text-decoration:none;color:var(--ink)}
.related-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.related-card img{width:100%;height:100px;object-fit:cover}
.related-card .rc-title{padding:10px;font-size:.85em;font-weight:600}
footer{margin-top:80px;padding:40px 24px;background:var(--surface);border-top:1px solid var(--border);text-align:center;color:var(--ink-light);font-size:.85em}
.footer-links{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;margin:12px 0}
.back-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;background:var(--accent);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.2em;cursor:pointer;box-shadow:0 4px 12px rgba(59,130,246,.3);opacity:0;transition:opacity .3s;z-index:99;border:none}
.back-top.visible{opacity:1}
@media(max-width:768px){html{font-size:15px}article{padding:16px 12px 40px}.hero{margin:-16px -12px 24px;border-radius:0}h1{font-size:1.5em}h2{font-size:1.2em}.data-grid{grid-template-columns:repeat(2,1fr)}}