:root{
  --blue:#2563eb;
  --blue-d:#1d4ed8;
  --ink:#0f172a;
  --text:#334155;
  --muted:#94a3b8;
  --line:#e2e8f0;
  --bg:#f4f7fc;
  --card:#ffffff;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;
}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-d)}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:20;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  max-width:1200px;margin:0 auto;padding:12px 20px;
  display:flex;align-items:center;gap:18px;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:9px;flex:none}
.brand-mark{
  width:32px;height:32px;border-radius:9px;
  background:linear-gradient(135deg,#3b82f6,#1d4ed8);
  color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;
  font-size:15px;letter-spacing:1px;
}
.brand-name{font-size:18px;font-weight:700;color:var(--ink);letter-spacing:.3px}

.search{flex:1;min-width:220px;max-width:520px;display:flex;margin-left:auto}
.search input{
  flex:1;min-width:0;padding:10px 14px;font-size:14px;
  border:1px solid var(--line);border-right:0;border-radius:10px 0 0 10px;
  background:#fff;outline:none;transition:.15s;
}
.search input:focus{border-color:#bfdbfe;box-shadow:inset 0 0 0 2px rgba(37,99,235,.1)}
.search button{
  padding:0 20px;border:0;border-radius:0 10px 10px 0;
  background:var(--blue);color:#fff;font-size:14px;cursor:pointer;
}
.search button:hover{background:var(--blue-d)}
.topnav{display:flex;gap:14px;font-size:14px;flex:none}
.topnav a{color:#64748b}
.topnav a:hover{color:var(--blue)}

/* ---------- 容器 ---------- */
.container{max-width:1200px;margin:0 auto;padding:24px 20px 10px}
.notice{
  background:#eff6ff;border:1px solid #bfdbfe;color:#1e40af;
  border-radius:10px;padding:10px 16px;margin-bottom:18px;font-size:14px;
}

/* ---------- 首屏搜索 ---------- */
.hero{
  background:linear-gradient(135deg,#1e40af 0%,#2563eb 55%,#3b82f6 100%);
  border-radius:18px;padding:38px 32px 30px;margin-bottom:26px;
  color:#fff;box-shadow:0 16px 36px -18px rgba(37,99,235,.55);
  position:relative;overflow:hidden;
}
.hero::after{
  content:"";position:absolute;right:-90px;top:-90px;
  width:280px;height:280px;border-radius:50%;
  background:rgba(255,255,255,.08);
}
.hero-title{margin:0 0 4px;font-size:26px;font-weight:700;letter-spacing:.5px}
.hero-sub{margin:0 0 18px;color:#dbeafe;font-size:14px}
.hero-search{position:relative;z-index:2;max-width:640px}
.hero-tabs{display:flex;gap:6px;margin-bottom:10px}
.hero-tab{
  border:0;background:rgba(255,255,255,.14);color:#e0ecff;
  padding:5px 14px;border-radius:20px;font-size:13px;cursor:pointer;transition:.15s;
}
.hero-tab.active{background:#fff;color:var(--blue-d);font-weight:600}
.hero-form{display:flex;background:#fff;border-radius:12px;padding:5px;box-shadow:0 8px 20px -10px rgba(15,23,42,.4)}
.hero-form input{
  flex:1;min-width:0;border:0;outline:none;padding:11px 14px;font-size:15px;
  background:transparent;color:var(--ink);
}
.hero-form button{
  border:0;border-radius:8px;padding:0 24px;background:var(--blue);color:#fff;
  font-size:14px;cursor:pointer;white-space:nowrap;
}
.hero-form button:hover{background:var(--blue-d)}
.hero-tip{margin:12px 0 0;font-size:12.5px;color:#c7dcff}
.hero-tip b{color:#fff}

/* ---------- 分类区块 ---------- */
.block{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:18px 20px 20px;margin-bottom:18px;
}
.block-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.block-head h2{
  display:flex;align-items:center;gap:8px;margin:0;
  font-size:16px;font-weight:700;color:var(--ink);
}
.bar{display:inline-block;width:4px;height:16px;border-radius:2px;background:var(--blue)}
.hot-dot{
  width:8px;height:8px;border-radius:50%;background:#ef4444;
  box-shadow:0 0 0 4px rgba(239,68,68,.15);
}
.muted{color:var(--muted);font-size:12.5px}

/* ---------- 网址卡片 ---------- */
.site-grid{
  display:grid;gap:10px;
  grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
}
.site-card{
  display:flex;align-items:center;gap:11px;
  padding:10px 12px;border:1px solid transparent;border-radius:11px;
  background:#f8fafc;transition:transform .12s,box-shadow .16s,border-color .16s,background .16s;
  color:inherit;min-width:0;
}
.site-card:hover{
  background:#fff;border-color:#bfdbfe;
  box-shadow:0 6px 18px -8px rgba(37,99,235,.35);
  transform:translateY(-2px);
  color:inherit;
}
.site-ico{flex:none;display:flex;align-items:center;justify-content:center}
.nav-ico{border-radius:9px;object-fit:cover;background:#fff}
.nav-ico-text{
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:600;border-radius:9px;letter-spacing:0;
}
.site-main{display:flex;flex-direction:column;min-width:0;line-height:1.35}
.site-name{
  font-size:14.5px;font-weight:600;color:#1e293b;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.site-desc{
  font-size:12px;color:var(--muted);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.site-card:hover .site-name{color:var(--blue-d)}

.empty{color:var(--muted);font-size:13.5px;margin:6px 0 2px}

/* ---------- 页脚 ---------- */
.footer{
  max-width:1200px;margin:12px auto 0;padding:22px 20px 34px;
  text-align:center;color:#94a3b8;font-size:12.5px;line-height:1.9;
}
.footer a{color:#94a3b8}
.footer a:hover{color:var(--blue)}

/* ---------- 移动端 ---------- */
@media (max-width:640px){
  .topbar-inner{padding:10px 14px;gap:10px}
  .search{order:3;flex-basis:100%;max-width:none;margin-left:0}
  .brand-name{font-size:16px}
  .container{padding:16px 14px 6px}
  .hero{padding:26px 20px 22px;border-radius:14px}
  .hero-title{font-size:20px}
  .hero-form button{padding:0 16px;font-size:13px}
  .block{padding:16px;border-radius:12px}
  .site-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px}
  .site-card{padding:8px 10px;gap:9px}
}