*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#08060f;
  --card:#13101f;
  --card2:#17132a;
  --line:rgba(255,255,255,.08);
  --txt:#f0ecfa;
  --muted:#9c96b8;
  --c1:#a78bfa;
  --c2:#22d3ee;
  --grad:linear-gradient(115deg,#a78bfa,#22d3ee);
  --warn:#fbbf24;
  --ok:#34d399;
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);color:var(--txt);overflow-x:hidden;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.85;font-size:16px;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(700px 420px at 10% -5%,rgba(167,139,250,.13),transparent 62%),
    radial-gradient(760px 520px at 92% 6%,rgba(34,211,238,.13),transparent 62%),
    linear-gradient(180deg,#08060f 0%,#08060f 100%);
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul,ol{list-style:none}
.container{max-width:1180px;margin:0 auto;padding:0 22px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ============ 导航 ============ */
.topbar{
  position:sticky;top:0;z-index:80;
  background:rgba(8,6,15,.86);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.nav{position:relative;max-width:1180px;margin:0 auto;padding:0 22px;height:68px;display:flex;align-items:center;gap:16px}
.logo{display:flex;align-items:center;gap:9px;font-size:20px;font-weight:800;letter-spacing:.4px;color:#fff}
.logo img{border-radius:9px}
.nav-cb,.dd-cb{display:none}
.menu{display:flex;align-items:center;gap:4px;margin-left:auto}
.menu>li{position:relative}
.menu>li>a,.dd-label{
  display:block;padding:9px 14px;border-radius:10px;font-size:15px;color:var(--muted);
  cursor:pointer;transition:.22s;white-space:nowrap;
}
.menu>li>a:hover,.dd-label:hover{color:#fff;background:rgba(255,255,255,.06)}
.arr{font-size:11px;margin-left:4px;display:inline-block;transition:.22s}
.dd-cb:checked ~ .dd-label{color:#fff;background:rgba(255,255,255,.06)}
.dd-cb:checked ~ .dd-label .arr{transform:rotate(180deg)}
.sub{
  position:absolute;top:calc(100% + 8px);left:0;min-width:205px;
  background:#100d1e;border:1px solid var(--line);border-radius:14px;padding:8px;
  display:none;flex-direction:column;gap:2px;z-index:90;
  box-shadow:0 24px 56px -22px rgba(0,0,0,.9);
}
.dd-cb:checked ~ .sub{display:flex}
.sub a{display:block;padding:8px 12px;border-radius:9px;font-size:14px;color:var(--muted);transition:.2s}
.sub a:hover{color:#fff;background:rgba(167,139,250,.14)}
.btn-nav{
  display:inline-block;padding:10px 20px;border-radius:999px;font-size:14px;font-weight:700;
  background:var(--grad);color:#0a0618;white-space:nowrap;
  box-shadow:0 10px 26px -12px rgba(167,139,250,.9);transition:.25s;
}
.btn-nav:hover{transform:translateY(-2px)}
.burger{display:none;margin-left:auto;font-size:22px;color:#fff;cursor:pointer;padding:4px 10px;border-radius:10px;border:1px solid var(--line)}

/* ============ 通用 ============ */
.sec{padding:60px 0}
.sec-head{text-align:center;max-width:820px;margin:0 auto 40px}
.tag{
  display:inline-block;font-size:12.5px;letter-spacing:1.5px;padding:5px 14px;border-radius:999px;
  color:var(--c1);border:1px solid rgba(167,139,250,.38);background:rgba(167,139,250,.1);
}
.sec-head h2{font-size:clamp(23px,3vw,33px);font-weight:800;margin:16px 0 12px;line-height:1.35}
.sec-head p{color:var(--muted);font-size:15.5px}
.btn{
  display:inline-block;padding:14px 30px;border-radius:999px;font-weight:700;font-size:15px;
  background:var(--grad);color:#0a0618;transition:.25s;
  box-shadow:0 16px 34px -16px rgba(167,139,250,.95);
}
.btn:hover{transform:translateY(-2px);box-shadow:0 22px 44px -18px rgba(167,139,250,1)}
.btn-ghost{
  display:inline-block;padding:14px 28px;border-radius:999px;font-weight:600;font-size:15px;
  border:1px solid rgba(255,255,255,.2);color:#fff;transition:.25s;
}
.btn-ghost:hover{border-color:var(--c1);color:var(--c1);background:rgba(167,139,250,.1)}

/* ============ 页头 ============ */
.sm-hero{padding:56px 0 8px;text-align:center;position:relative;overflow:hidden}
.sm-hero::before{
  content:"";position:absolute;top:-160px;left:50%;transform:translateX(-50%);
  width:900px;height:420px;border-radius:50%;
  background:radial-gradient(closest-side,rgba(167,139,250,.16),transparent);
  pointer-events:none;
}
.sm-hero .container{position:relative;z-index:2}
.crumb{font-size:13px;color:var(--muted);margin-bottom:20px;display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:2px}
.crumb a:hover{color:var(--c1)}
.crumb i{margin:0 9px;opacity:.45;font-style:normal}
.sm-hero h1{font-size:clamp(28px,4vw,46px);font-weight:800;line-height:1.25;letter-spacing:-.4px}
.sm-hero .lead{margin:20px auto 0;max-width:820px;color:var(--muted);font-size:16.5px}
.sm-hero .lead strong{color:#d9d2f0;font-weight:600}
.sm-meta{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-top:28px}
.sm-meta span{
  font-size:13px;color:var(--muted);padding:5px 16px;border-radius:999px;
  border:1px solid var(--line);background:rgba(255,255,255,.03);
}
.sm-meta b{color:var(--c1);font-weight:700}

/* ============ 快速跳转胶囊 ============ */
.quick-jump{
  display:flex;flex-wrap:wrap;justify-content:center;gap:10px;
  max-width:960px;margin:36px auto 0;
}
.quick-jump a{
  font-size:13.5px;padding:8px 18px;border-radius:999px;border:1px solid var(--line);
  color:var(--muted);transition:.22s;
}
.quick-jump a:hover{color:#fff;border-color:rgba(167,139,250,.5);background:rgba(167,139,250,.08)}

/* ============ 站点地图网格 ============ */
.sm-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:22px;
}
.sm-card{
  background:var(--card);border:1px solid var(--line);border-radius:20px;
  padding:26px 26px 24px;transition:.28s;position:relative;
}
.sm-card:hover{border-color:rgba(167,139,250,.4);box-shadow:0 26px 60px -40px rgba(167,139,250,.6)}
.sm-card-head{
  display:flex;align-items:center;gap:14px;margin-bottom:18px;
  padding-bottom:16px;border-bottom:1px dashed rgba(255,255,255,.12);
}
.sm-ic{
  width:44px;height:44px;border-radius:13px;display:grid;place-items:center;font-size:20px;flex:0 0 auto;
  background:rgba(167,139,250,.12);border:1px solid rgba(167,139,250,.3);
}
.sm-card-head .sm-t{flex:1;min-width:0}
.sm-card-head h3{font-size:18px;font-weight:800;margin-bottom:3px;color:#fff}
.sm-card-head .sm-sub{font-size:12.5px;color:var(--muted);letter-spacing:.4px}
.sm-list{display:flex;flex-direction:column;gap:11px}
.sm-list li{
  display:flex;gap:13px;align-items:flex-start;
  padding:12px 14px;border-radius:12px;transition:.22s;
  border:1px solid transparent;
}
.sm-list li:hover{
  background:rgba(167,139,250,.07);border-color:rgba(167,139,250,.22);
}
.sm-list li .sm-arrow{
  color:var(--c1);font-weight:800;font-size:13px;flex:0 0 auto;
  margin-top:5px;transition:.22s;
}
.sm-list li:hover .sm-arrow{transform:translateX(3px)}
.sm-list li .sm-body{flex:1;min-width:0}
.sm-list li a.sm-link{
  font-size:15px;font-weight:700;color:#ece6fb;transition:.2s;
  display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap;
}
.sm-list li a.sm-link:hover{color:var(--c1)}
.sm-list li .sm-desc{
  display:block;font-size:13px;color:var(--muted);line-height:1.7;margin-top:3px;
}
.sm-badge{
  font-size:10.5px;padding:2px 8px;border-radius:999px;font-weight:700;
  background:rgba(34,211,238,.12);color:#67e8f9;border:1px solid rgba(34,211,238,.3);
}
.sm-badge.hot{background:rgba(244,114,182,.12);color:#f9a8d4;border-color:rgba(244,114,182,.3)}
.sm-badge.new{background:rgba(52,211,153,.12);color:#6ee7b7;border-color:rgba(52,211,153,.3)}

/* ============ 站点结构树 ============ */
.tree-box{
  background:linear-gradient(160deg,#151029,#0d0a18);
  border:1px solid var(--line);border-radius:22px;padding:32px 34px;
  margin-top:16px;
}
.tree-box h3{font-size:19px;margin-bottom:18px;font-weight:800;color:#fff}
.tree{
  font-family:-apple-system,BlinkMacSystemFont,"SF Mono","Consolas",monospace;
  font-size:13.5px;color:var(--muted);line-height:2;overflow-x:auto;
}
.tree-line{white-space:nowrap}
.tree-line .tree-1{color:var(--c1);font-weight:700}
.tree-line .tree-2{color:#cbc5de}
.tree-line .tree-c{color:#6f6a86;opacity:.7}

/* ============ 索引统计 ============ */
.stat-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
  max-width:960px;margin:0 auto;
}
.stat-c{
  background:var(--card);border:1px solid var(--line);border-radius:18px;
  padding:26px 20px;text-align:center;transition:.28s;
}
.stat-c:hover{transform:translateY(-4px);border-color:rgba(167,139,250,.38)}
.stat-c b{
  display:block;font-size:28px;font-weight:800;line-height:1.3;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.stat-c span{font-size:13px;color:var(--muted)}

/* ============ SEO / 爬虫友好说明 ============ */
.seo-box{
  background:var(--card);border:1px solid var(--line);border-radius:22px;
  padding:34px 34px;margin-top:16px;
}
.seo-box h3{font-size:19px;font-weight:800;margin-bottom:16px;color:#fff}
.seo-box p{font-size:14.5px;color:var(--muted);line-height:1.9;margin-bottom:12px}
.seo-box p:last-child{margin-bottom:0}
.seo-files{
  display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:22px;
}
.seo-file{
  background:var(--card2);border:1px solid var(--line);border-radius:14px;
  padding:18px 18px;transition:.25s;
}
.seo-file:hover{border-color:rgba(167,139,250,.42)}
.seo-file b{
  display:block;font-size:13.5px;color:#fff;margin-bottom:6px;
  font-family:-apple-system,BlinkMacSystemFont,"SF Mono","Consolas",monospace;
}
.seo-file span{font-size:12.5px;color:var(--muted);display:block;line-height:1.7}
.seo-file a{color:var(--c2);font-size:12.5px}
.seo-file a:hover{color:#67e8f9;text-decoration:underline}

/* ============ CTA ============ */
.cta{padding:20px 0 80px}
.cta-box{
  text-align:center;padding:60px 26px;border-radius:26px;
  background:
    radial-gradient(600px 300px at 50% 0%,rgba(167,139,250,.2),transparent 70%),
    linear-gradient(160deg,#151029,#0d0a18);
  border:1px solid var(--line);
}
.cta-box h2{font-size:clamp(23px,3vw,33px);font-weight:800;margin-bottom:12px}
.cta-box p{color:var(--muted);margin-bottom:26px}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}

/* ============ 页脚 ============ */
footer{background:#050409;border-top:1px solid var(--line);padding:52px 0 24px}
.foot{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
.fdesc{font-size:13.5px;color:var(--muted);margin-top:14px;max-width:340px}
footer h4{font-size:14.5px;margin-bottom:14px;color:#fff}
footer ul{display:flex;flex-direction:column;gap:9px}
footer ul a{font-size:13.5px;color:var(--muted);transition:.2s}
footer ul a:hover{color:var(--c1)}
.copy{
  margin-top:38px;padding-top:20px;border-top:1px solid var(--line);
  font-size:13px;color:#79738f;text-align:center;
}
.copy a{color:#9c96b4}
.copy a:hover{color:var(--c1)}

.totop{
  position:fixed;right:20px;bottom:24px;width:44px;height:44px;border-radius:50%;
  display:grid;place-items:center;font-size:18px;font-weight:700;
  background:var(--grad);color:#0a0618;box-shadow:0 14px 30px -14px rgba(167,139,250,.95);z-index:70;
}

/* 滚动动画 */
.js .reveal{opacity:0;transform:translateY(18px);transition:opacity .62s ease,transform .62s ease}
.js .reveal.in{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media(max-width:1000px){
  .sm-grid{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
  .seo-files{grid-template-columns:1fr}
  .foot{grid-template-columns:1fr 1fr}
}
@media(max-width:900px){
  .burger{display:block}
  .btn-nav{display:none}
  .menu{
    display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;
    background:#0d0a18;border-bottom:1px solid var(--line);padding:10px 18px 18px;gap:2px;margin-left:0;
  }
  .nav-cb:checked ~ .menu{display:flex}
  .menu>li>a,.dd-label{padding:11px 12px}
  .sub{position:static;display:none;box-shadow:none;background:transparent;border:none;padding:0 0 0 14px;min-width:0}
  .dd-cb:checked ~ .sub{display:flex}
}
@media(max-width:620px){
  body{font-size:15.5px}
  .sec{padding:46px 0}
  .sm-hero{padding:42px 0 6px}
  .stat-grid{grid-template-columns:1fr}
  .sm-card{padding:22px 20px}
  .tree-box,.seo-box{padding:24px 22px}
  .tree{font-size:12.5px}
  .sm-list li{padding:10px 12px}
  .foot{grid-template-columns:1fr}
  .cta-box{padding:44px 20px}
}