:root{
  --bg:#ffffff;
  --surface:#f5f5f7;
  --ink:#1d1d1f;
  --muted:#6e6e73;
  --line:#d2d2d7;
  --blue:#0066cc;
  --blue-hover:#0077ed;
  --hot:#bf2b27;
  --new:#1d8a4d;
  --top:#6d28d9;
  --radius:18px;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px;letter-spacing:-.01em}
a{color:inherit;text-decoration:none}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* ---------- Hero ---------- */
header.hero{background:var(--bg);text-align:center;padding:120px 0 72px}
.hero .badge{display:inline-block;font-size:14px;font-weight:600;color:var(--blue);letter-spacing:0;margin-bottom:18px}
.hero h1{font-size:clamp(40px,6vw,72px);line-height:1.05;font-weight:600;letter-spacing:-.02em;margin:0 auto 20px;max-width:18ch}
.hero h1 .grad{color:var(--blue)}
.hero p.sub{color:var(--muted);max-width:620px;margin:0 auto;font-size:clamp(17px,2.2vw,21px);line-height:1.45}
.hero .stats{display:flex;flex-wrap:wrap;justify-content:center;gap:56px;margin-top:44px}
.hero .stat b{font-size:32px;font-weight:600;display:block;letter-spacing:-.02em}
.hero .stat span{font-size:13px;color:var(--muted);margin-top:4px;display:block}

.searchbar{margin:40px auto 0;display:flex;gap:10px;max-width:560px;justify-content:center}
.searchbar input{flex:1;min-width:0;border:1px solid var(--line);background:var(--bg);outline:0;padding:13px 18px;font-size:16px;color:var(--ink);border-radius:980px;font-family:var(--font)}
.searchbar input:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(0,102,204,.12)}
.searchbar button{border:0;background:var(--blue);color:#fff;padding:0 26px;border-radius:980px;font-weight:500;cursor:pointer;font-size:16px;font-family:var(--font);transition:background .2s}
.searchbar button:hover{background:var(--blue-hover)}

/* ---------- Sticky nav ---------- */
nav.toc{position:sticky;top:40px;z-index:50;background:rgba(255,255,255,.72);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(0,0,0,.08)}
nav.toc .wrap{display:flex;gap:6px;overflow-x:auto;padding:0 24px;scrollbar-width:none;justify-content:center}
nav.toc .wrap::-webkit-scrollbar{display:none}
nav.toc a{white-space:nowrap;font-size:14px;padding:14px 12px;color:var(--muted);transition:color .2s}
nav.toc a:hover{color:var(--ink)}
nav.toc a.active{color:var(--blue);font-weight:500}

/* ---------- Sections ---------- */
section{padding:72px 0 8px}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:32px;flex-wrap:wrap}
.sec-head h2{font-size:clamp(28px,3.4vw,38px);letter-spacing:-.02em;font-weight:600;display:flex;align-items:center;gap:10px}
.sec-head h2 .ic{font-size:30px}
.sec-head .count{font-size:13px;color:var(--muted);background:var(--surface);padding:5px 13px;border-radius:980px}
.sec-head p.desc{color:var(--muted);font-size:15px;max-width:760px;margin-top:10px;line-height:1.6}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(248px,1fr));gap:18px}
.card{background:var(--surface);border-radius:var(--radius);padding:22px 20px;transition:transform .25s ease,box-shadow .25s ease}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(0,0,0,.08)}
.card .top{display:flex;align-items:center;gap:13px;margin-bottom:12px}
.card .logo{width:44px;height:44px;border-radius:11px;display:grid;place-items:center;font-size:22px;background:#fff;overflow:hidden;flex-shrink:0;box-shadow:0 1px 2px rgba(0,0,0,.06)}
.card .logo img.ico{width:44px;height:44px;border-radius:11px;object-fit:cover;display:block}
.card .name{font-weight:600;font-size:16px;letter-spacing:-.01em}
.card .desc{font-size:14px;color:var(--muted);min-height:42px;line-height:1.5}
.card .meta{display:flex;align-items:center;justify-content:space-between;margin-top:14px}
.tag{font-size:11px;font-weight:600;padding:3px 10px;border-radius:980px;background:rgba(0,102,204,.1);color:var(--blue);letter-spacing:.02em}
.tag.HOT{background:rgba(191,43,39,.1);color:var(--hot)}
.tag.NEW{background:rgba(29,138,77,.12);color:var(--new)}
.tag.top{background:rgba(109,40,217,.1);color:var(--top)}
.card .go{font-size:13px;color:var(--blue);font-weight:500}
.card .go::after{content:" ›"}

.subsection-title{font-size:15px;font-weight:600;color:var(--ink);margin:34px 0 16px;letter-spacing:-.01em}

/* ---------- Highlight (viral) cards ---------- */
.hl-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.hl-card{display:block;background:var(--surface);border-radius:20px;padding:26px;position:relative;overflow:hidden;transition:transform .25s ease,box-shadow .25s ease;text-decoration:none;color:inherit}
.hl-card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(0,0,0,.09)}
.hl-card .rank{position:absolute;top:18px;right:22px;font-size:40px;font-weight:600;color:rgba(0,0,0,.08);letter-spacing:-.03em}
.hl-card h3{font-size:21px;font-weight:600;display:flex;align-items:center;gap:9px;letter-spacing:-.01em}
.hl-card .why{font-size:14.5px;color:var(--muted);margin-top:12px;line-height:1.55}
.hl-card .chip{display:inline-block;margin-top:16px;font-size:12.5px;background:rgba(0,102,204,.1);color:var(--blue);padding:5px 12px;border-radius:980px;font-weight:500}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;border-radius:var(--radius);background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:720px;font-size:14px}
thead th{background:#fff;color:var(--ink);text-align:left;padding:14px 16px;font-weight:600;white-space:nowrap;font-size:13px;border-bottom:1px solid var(--line)}
tbody td{padding:13px 16px;border-top:1px solid rgba(0,0,0,.06);white-space:nowrap}
tbody tr:hover{background:rgba(0,0,0,.02)}
.num{font-weight:600;color:var(--ink)}
.lic{font-size:11px;padding:3px 10px;border-radius:980px;font-weight:500}
.lic.open{background:rgba(29,138,77,.12);color:var(--new)}
.lic.prop{background:rgba(191,43,39,.1);color:var(--hot)}
.pill{font-size:11px;padding:3px 10px;border-radius:980px;background:rgba(109,40,217,.1);color:var(--top);font-weight:500}

.two-col{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.infra-group{background:var(--surface);border-radius:var(--radius);padding:26px}
.infra-group h4{font-size:17px;margin-bottom:16px;display:flex;align-items:center;gap:8px;font-weight:600}
.infra-item{padding:13px 0;border-top:1px solid rgba(0,0,0,.06)}
.infra-item:first-of-type{border-top:0}
.infra-item .n{font-weight:600;font-size:15px}
.infra-item .d{font-size:13.5px;color:var(--muted);margin-top:3px;line-height:1.5}

footer{margin-top:80px;background:var(--surface);color:var(--muted);padding:40px 0;text-align:center;font-size:12.5px;border-top:1px solid rgba(0,0,0,.06)}
footer a{color:var(--muted);text-decoration:underline}
.contact{margin:10px 0;font-size:13px}
.disclaimer{font-size:11.5px;color:#86868b;max-width:820px;margin:14px auto 0;line-height:1.7}

/* ---------- 留言板 ---------- */
.gb-wrap{position:fixed;right:28px;top:80px;z-index:100}
.gb-btn{width:50px;height:50px;border-radius:50%;border:1px solid var(--line);background:var(--surface);font-size:22px;cursor:pointer;display:grid;place-items:center;box-shadow:0 2px 12px rgba(0,0,0,.1);transition:background .2s,transform .2s}
.gb-btn:hover{background:var(--blue);color:#fff;transform:scale(1.08)}
.gb-btn.active{background:var(--blue);color:#fff}
.gb-panel{position:absolute;top:60px;right:0;width:320px;background:#fff;border-radius:16px;box-shadow:0 8px 40px rgba(0,0,0,.12);border:1px solid var(--line);padding:0;overflow:hidden;opacity:0;transform:translateY(-8px);pointer-events:none;transition:opacity .25s,transform .25s}
.gb-panel.open{opacity:1;transform:translateY(0);pointer-events:auto}
.gb-head{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid rgba(0,0,0,.06)}
.gb-head h3{font-size:16px;font-weight:600}
.gb-head button{background:none;border:0;font-size:18px;cursor:pointer;color:var(--muted);padding:4px;line-height:1}
.gb-head button:hover{color:var(--ink)}
.gb-panel form{padding:16px 20px 20px;display:flex;flex-direction:column;gap:12px}
.gb-panel input,.gb-panel textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 14px;font-size:14px;font-family:var(--font);outline:0;background:var(--bg);color:var(--ink);transition:border-color .2s}
.gb-panel input:focus,.gb-panel textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(0,102,204,.1)}
.gb-panel textarea{resize:vertical;min-height:80px}
.gb-panel button[type=submit]{width:100%;padding:11px;border:0;border-radius:10px;background:var(--blue);color:#fff;font-size:15px;font-weight:500;cursor:pointer;font-family:var(--font);transition:background .2s}
.gb-panel button[type=submit]:hover{background:var(--blue-hover)}
.gb-panel button[type=submit]:disabled{opacity:.6;cursor:not-allowed}
.gb-ok{position:fixed;inset:0;background:rgba(0,0,0,.35);display:flex;align-items:center;justify-content:center;z-index:200;opacity:0;pointer-events:none;transition:opacity .3s}
.gb-ok.show{opacity:1;pointer-events:auto}
.gb-ok-box{background:#fff;border-radius:18px;padding:40px 36px;text-align:center;max-width:360px;width:90%;box-shadow:0 12px 48px rgba(0,0,0,.15);transform:scale(.9);transition:transform .3s}
.gb-ok.show .gb-ok-box{transform:scale(1)}
.gb-ok-icon{font-size:48px;margin-bottom:12px}
.gb-ok-box h3{font-size:20px;font-weight:600;margin-bottom:8px}
.gb-ok-box p{font-size:14.5px;color:var(--muted);line-height:1.55;margin-bottom:24px}
.gb-ok-box button{padding:10px 32px;border:0;border-radius:980px;background:var(--blue);color:#fff;font-size:15px;font-weight:500;cursor:pointer;font-family:var(--font);transition:background .2s}
.gb-ok-box button:hover{background:var(--blue-hover)}

.empty{padding:40px;text-align:center;color:var(--muted);display:none}
.back-top{position:fixed;right:28px;bottom:36px;width:44px;height:44px;border-radius:50%;background:var(--surface);color:var(--ink);display:flex;align-items:center;justify-content:center;box-shadow:0 2px 12px rgba(0,0,0,.1);opacity:0;pointer-events:none;transition:opacity .3s,transform .3s;z-index:999;border:1px solid var(--line)}
.back-top.show{opacity:1;pointer-events:auto}
.back-top:hover{background:var(--blue);color:#fff;transform:translateY(-3px)}

/* ---------- GitHub 项目精选 ---------- */
.github-card{background:var(--surface);border-radius:var(--radius);padding:22px 20px;transition:transform .25s ease,box-shadow .25s ease;position:relative;display:flex;flex-direction:column;justify-content:space-between}
.github-card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(0,0,0,.08)}
.github-card .top{display:flex;align-items:center;gap:13px;margin-bottom:12px}
.github-card .logo{width:48px;height:48px;border-radius:12px;overflow:hidden;flex-shrink:0;background:#fff;display:grid;place-items:center;box-shadow:0 1px 2px rgba(0,0,0,.06)}
.github-card .logo img{width:48px;height:48px;border-radius:12px;object-fit:cover}
.github-card .name{font-weight:600;font-size:16px;letter-spacing:-.01em}
.github-card .owner{font-size:13px;color:var(--muted);margin-top:2px}
.github-card .desc{font-size:14px;color:var(--muted);min-height:42px;line-height:1.5;margin-bottom:12px}
.github-card .meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.github-card .meta-item{display:flex;align-items:center;gap:4px;font-size:13px;color:var(--muted)}
.github-card .meta-item svg{width:14px;height:14px}
.github-card .tags{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}
.github-card .tag{font-size:11px;padding:3px 10px;border-radius:980px;background:rgba(0,102,204,.1);color:var(--blue);font-weight:500}
.github-card .tag.lang{background:rgba(109,40,217,.1);color:var(--top)}
.github-card .btn{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:var(--blue);font-weight:500;cursor:pointer;border:0;background:none;padding:0;font-family:var(--font)}
.github-card .btn:hover{text-decoration:underline}
.github-card .btn::after{content:"›"}

/* GitHub View All button */
.github-view-all-btn{display:inline-block;padding:12px 32px;border-radius:980px;background:var(--blue);color:#fff;font-size:15px;font-weight:500;font-family:var(--font);transition:background .2s,transform .25s}
.github-view-all-btn:hover{background:var(--blue-hover);transform:translateY(-2px);box-shadow:0 4px 16px rgba(0,102,204,.25)}

@media (max-width:720px){.two-col{grid-template-columns:1fr}.hero .stats{gap:32px}header.hero{padding:80px 0 48px}.back-top{right:14px;bottom:24px;width:40px;height:40px}.gb-wrap{right:14px;top:auto;bottom:90px}.gb-panel{width:calc(100vw - 28px);right:-14px}}