:root{
  --bg:#0d0d0f; --bg2:#16161a; --panel:#1c1c22; --line:#2a2a32;
  --ink:#ededf2; --muted:#9a9aa5; --faint:#6a6a75;
  --accent:#e8503a; --accent2:#f2b134; --teal:#4a9d9c; --violet:#7b6cf6;
  --maxw:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.75; -webkit-font-smoothing:antialiased;
}
a{color:inherit; text-decoration:none}
img{max-width:100%; height:auto; border-radius:6px}

/* nav */
.site-nav{
  position:sticky; top:0; z-index:50;
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 26px; background:rgba(13,13,15,.86); backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.brand{font-weight:800; font-size:21px; letter-spacing:1px}
.brand span{color:var(--accent)}
.site-nav nav{display:flex; gap:22px}
.site-nav nav a{color:var(--muted); font-size:15px; transition:color .2s}
.site-nav nav a:hover{color:var(--ink)}

.wrap{max-width:var(--maxw); margin:0 auto; padding:0 26px}
.site-foot{
  max-width:var(--maxw); margin:80px auto 40px; padding:24px 26px 0;
  border-top:1px solid var(--line); color:var(--muted); font-size:13px;
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:8px;
}
.muted{color:var(--muted)}
.faint{color:var(--faint)}

/* hero */
.hero{padding:80px 26px 50px; max-width:var(--maxw); margin:0 auto}
.hero h1{font-size:clamp(38px,6vw,68px); line-height:1.05; margin:0 0 18px; font-weight:900; letter-spacing:-1px}
.hero h1 em{font-style:normal; color:var(--accent)}
.hero .lead{font-size:19px; color:var(--muted); max-width:720px; margin:0 0 36px}
.hero .cta{display:flex; gap:14px; flex-wrap:wrap}
.btn{
  display:inline-block; padding:12px 24px; border-radius:8px; font-weight:600; font-size:15px;
  border:1px solid var(--line); transition:all .18s;
}
.btn.primary{background:var(--accent); border-color:var(--accent); color:#fff}
.btn.primary:hover{filter:brightness(1.1)}
.btn:hover{border-color:var(--muted)}

/* stats */
.stats{display:grid; grid-template-columns:repeat(3,1fr); gap:18px; max-width:var(--maxw); margin:30px auto; padding:0 26px}
.stat{background:var(--panel); border:1px solid var(--line); border-radius:14px; padding:26px}
.stat .num{font-size:46px; font-weight:900; line-height:1; background:linear-gradient(120deg,var(--accent),var(--accent2)); -webkit-background-clip:text; background-clip:text; color:transparent}
.stat .lbl{color:var(--muted); margin-top:10px; font-size:15px}

/* section */
.section{max-width:var(--maxw); margin:64px auto; padding:0 26px}
.section h2{font-size:28px; margin:0 0 8px; font-weight:800}
.section .sub{color:var(--muted); margin:0 0 28px}

/* feature cards */
.feat-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:18px}
.feat{background:var(--panel); border:1px solid var(--line); border-radius:14px; padding:26px; transition:transform .18s,border-color .18s; display:block}
.feat:hover{transform:translateY(-3px); border-color:var(--accent)}
.feat h3{margin:0 0 8px; font-size:20px}
.feat p{margin:0; color:var(--muted); font-size:15px}
.feat .tag{display:inline-block; font-size:12px; color:var(--accent2); margin-bottom:10px; letter-spacing:1px}

/* article list */
.toolbar{display:flex; gap:12px; flex-wrap:wrap; align-items:center; margin-bottom:24px}
.toolbar input[type=search]{
  flex:1; min-width:220px; background:var(--bg2); border:1px solid var(--line); color:var(--ink);
  padding:11px 16px; border-radius:9px; font-size:15px;
}
.toolbar input::placeholder{color:var(--faint)}
.chip{padding:8px 16px; border-radius:20px; border:1px solid var(--line); background:var(--bg2); color:var(--muted); cursor:pointer; font-size:14px; transition:all .15s}
.chip.active{background:var(--accent); border-color:var(--accent); color:#fff}
.count-note{color:var(--faint); font-size:13px; margin-bottom:14px}

.alist{display:flex; flex-direction:column; gap:2px}
.arow{
  display:grid; grid-template-columns:64px 1fr auto; gap:18px; align-items:center;
  padding:16px 14px; border-bottom:1px solid var(--line); transition:background .15s;
}
.arow:hover{background:var(--bg2)}
.arow .aid{color:var(--faint); font-variant-numeric:tabular-nums; font-size:14px}
.arow .atitle{font-size:17px; font-weight:600}
.arow .ameta{color:var(--muted); font-size:13px; white-space:nowrap; text-align:right}
.arow .author{display:inline-block; padding:2px 9px; border-radius:5px; background:var(--bg2); border:1px solid var(--line); font-size:12px; margin-left:8px}

/* article detail */
.article{max-width:760px; margin:48px auto; padding:0 26px}
.article .crumb{color:var(--faint); font-size:14px; margin-bottom:18px}
.article .crumb a:hover{color:var(--ink)}
.article h1.title{font-size:clamp(28px,4.5vw,42px); line-height:1.2; margin:0 0 14px; font-weight:900}
.article .meta{color:var(--muted); font-size:14px; margin-bottom:32px; padding-bottom:24px; border-bottom:1px solid var(--line)}
.article .meta .author{color:var(--accent2); font-weight:600}
.prose{font-size:17px; line-height:1.9}
.prose h1{font-size:30px; margin:38px 0 16px}
.prose h2{font-size:25px; margin:34px 0 14px; border-left:4px solid var(--accent); padding-left:14px}
.prose h3{font-size:21px; margin:28px 0 12px}
.prose p{margin:0 0 18px}
.prose blockquote{margin:22px 0; padding:14px 20px; border-left:3px solid var(--accent2); background:var(--bg2); border-radius:0 8px 8px 0; color:#d8d8e0}
.prose ul,.prose ol{margin:0 0 18px; padding-left:26px}
.prose li{margin:6px 0}
.prose code{background:var(--bg2); padding:2px 6px; border-radius:5px; font-size:.9em; color:var(--accent2)}
.prose pre{background:var(--bg2); border:1px solid var(--line); border-radius:10px; padding:16px; overflow:auto}
.prose pre code{background:none; color:var(--ink); padding:0}
.prose hr{border:none; border-top:1px solid var(--line); margin:32px 0}
.prose a{color:var(--teal); text-decoration:underline; text-underline-offset:3px}
.prose img{display:block; margin:20px auto}
.pager{display:flex; justify-content:space-between; margin-top:54px; padding-top:24px; border-top:1px solid var(--line); gap:14px}
.pager a{color:var(--muted); font-size:14px; max-width:46%}
.pager a:hover{color:var(--ink)}
.pager .nx{text-align:right; margin-left:auto}

/* graph page */
.graph-head{max-width:var(--maxw); margin:36px auto 0; padding:0 26px}
.graph-head h1{font-size:32px; margin:0 0 6px; font-weight:800}
.graph-head p{color:var(--muted); margin:0}
#graphStage{position:relative; max-width:var(--maxw); margin:24px auto; padding:0 26px}
#graphCanvas{width:100%; height:600px; background:radial-gradient(circle at 50% 40%, #15151b, #0d0d0f); border:1px solid var(--line); border-radius:14px; display:block; cursor:grab}
#graphCanvas:active{cursor:grabbing}
.legend{display:flex; gap:18px; flex-wrap:wrap; margin:14px 0; font-size:14px}
.legend span{display:inline-flex; align-items:center; gap:7px; color:var(--muted)}
.legend i{width:12px; height:12px; border-radius:50%; display:inline-block}
.gtip{position:absolute; pointer-events:none; background:#000; border:1px solid var(--line); border-radius:8px; padding:10px 13px; font-size:13px; max-width:280px; color:var(--ink); display:none; z-index:20; box-shadow:0 8px 24px rgba(0,0,0,.5)}
.gtip b{color:var(--accent2)}
.gtip .t{color:var(--faint); font-size:11px; text-transform:uppercase; letter-spacing:1px}
.ghint{color:var(--faint); font-size:13px; text-align:center; margin-top:-8px}

/* leaderboards */
.lb-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:22px}
.lb{background:var(--panel); border:1px solid var(--line); border-radius:14px; padding:22px; overflow:hidden}
.lb h3{margin:0 0 4px; font-size:19px; display:flex; align-items:center; gap:8px}
.lb h3 i{width:11px; height:11px; border-radius:3px; display:inline-block}
.lb .sub{color:var(--faint); font-size:12px; margin:0 0 14px}
.lb ol{margin:0; padding:0; list-style:none; counter-reset:r}
.lb li{display:grid; grid-template-columns:30px 1fr auto; gap:12px; align-items:baseline; padding:9px 0; border-top:1px solid var(--line)}
.lb li:first-of-type{border-top:none}
.lb .rk{color:var(--faint); font-weight:700; font-variant-numeric:tabular-nums}
.lb li.top1 .rk{color:var(--accent)}
.lb li.top2 .rk{color:var(--accent2)}
.lb li.top3 .rk{color:var(--teal)}
.lb .nm{font-weight:600}
.lb .ds{color:var(--muted); font-size:12.5px; display:block; margin-top:2px; line-height:1.5}
.lb .mt{color:var(--faint); font-size:12px; white-space:nowrap; font-variant-numeric:tabular-nums}

@media(max-width:820px){
  .stats{grid-template-columns:1fr}
  .feat-grid{grid-template-columns:1fr}
  .lb-grid{grid-template-columns:1fr}
  .arow{grid-template-columns:1fr; gap:4px}
  .arow .ameta{text-align:left}
  .site-nav{padding:12px 18px}
  .site-nav nav{gap:14px}
}