:root{
  --bg:#0e1117; --bg2:#161b22; --card:#1b2230; --line:#273043;
  --fg:#e6edf3; --muted:#8b98ac; --accent:#ff8a3d; --accent2:#ffb066;
  --ok:#3fb950; --err:#f85149; --warn:#d29922; --info:#58a6ff;
  --radius:14px; --shadow:0 8px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:radial-gradient(1200px 600px at 80% -10%, #1d2634 0%, var(--bg) 55%) fixed;
  color:var(--fg); font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Arial,sans-serif;
  min-height:100vh; -webkit-font-smoothing:antialiased;
}
a{color:var(--accent2);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header.top{border-bottom:1px solid var(--line);background:rgba(14,17,23,.7);backdrop-filter:blur(10px);position:sticky;top:0;z-index:20}
header.top .bar{display:flex;align-items:center;gap:16px;height:64px}
.logo{font-weight:800;font-size:18px;display:flex;align-items:center;gap:8px;color:var(--fg)}
.logo .fox{filter:drop-shadow(0 0 8px rgba(255,138,61,.5))}
nav.links{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}
nav.links a{padding:8px 14px;border-radius:10px;color:var(--muted);font-weight:600;font-size:14px}
nav.links a:hover{background:var(--bg2);color:var(--fg);text-decoration:none}
nav.links a.active{background:var(--accent);color:#1a1205}
main{padding:34px 0 70px}
h1{font-size:28px;margin:0 0 6px}
h2{font-size:20px;margin:34px 0 12px}
h3{font-size:16px;margin:22px 0 8px;color:var(--accent2)}
p.lead{color:var(--muted);margin:0 0 26px;font-size:16px}
.card{background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:1fr 1fr}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:820px){.g2,.g3,.g4{grid-template-columns:1fr}}
label{display:block;font-size:13px;color:var(--muted);margin:0 0 6px;font-weight:600}
input,select,textarea{
  width:100%;background:#0c1017;border:1px solid var(--line);color:var(--fg);
  border-radius:10px;padding:11px 13px;font:inherit;outline:none;transition:border .15s
}
input:focus,select:focus,textarea:focus{border-color:var(--accent)}
textarea{resize:vertical;min-height:120px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13.5px}
button,.btn{
  background:var(--accent);color:#1a1205;border:0;border-radius:10px;padding:11px 18px;
  font-weight:700;font-size:14px;cursor:pointer;transition:transform .05s,filter .15s;display:inline-flex;align-items:center;gap:8px
}
button:hover,.btn:hover{filter:brightness(1.08);text-decoration:none}
button:active{transform:translateY(1px)}
button.ghost,.btn.ghost{background:var(--bg2);color:var(--fg);border:1px solid var(--line)}
button.danger{background:var(--err);color:#fff}
button.sm{padding:7px 12px;font-size:13px;border-radius:8px}
button:disabled{opacity:.5;cursor:not-allowed}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end}
.row>*{flex:1;min-width:140px}
.row.auto>*{flex:0 0 auto;min-width:0}
.pill{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:700}
.pill.ok{background:rgba(63,185,80,.15);color:var(--ok)}
.pill.off{background:rgba(248,81,73,.15);color:var(--err)}
.pill.info{background:rgba(88,166,255,.15);color:var(--info)}
.pill.en{background:rgba(88,166,255,.15);color:var(--info)}
.pill.vi{background:rgba(210,153,34,.18);color:var(--warn)}
code,kbd{background:#0c1017;border:1px solid var(--line);border-radius:6px;padding:2px 7px;font-family:ui-monospace,Menlo,monospace;font-size:13px}
pre{background:#0a0e14;border:1px solid var(--line);border-radius:12px;padding:16px;overflow:auto;font-size:13px;line-height:1.5}
pre code{background:none;border:0;padding:0}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-weight:600;font-size:12.5px;text-transform:uppercase;letter-spacing:.03em}
tr:hover td{background:rgba(255,255,255,.02)}
.muted{color:var(--muted)}
.small{font-size:13px}
.mono{font-family:ui-monospace,Menlo,monospace}
.stat{background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.stat .n{font-size:26px;font-weight:800}
.stat .l{color:var(--muted);font-size:13px;margin-top:2px}
.toast{position:fixed;right:20px;bottom:20px;background:var(--card);border:1px solid var(--line);
  border-left:4px solid var(--accent);border-radius:10px;padding:13px 18px;box-shadow:var(--shadow);
  opacity:0;transform:translateY(10px);transition:.25s;z-index:100;max-width:340px}
.toast.show{opacity:1;transform:none}
.toast.err{border-left-color:var(--err)}
.toast.ok{border-left-color:var(--ok)}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.6);display:none;align-items:center;justify-content:center;z-index:200;padding:20px}
.modal.show{display:flex}
.modal .box{background:var(--bg2);border:1px solid var(--line);border-radius:16px;padding:26px;max-width:520px;width:100%;box-shadow:var(--shadow)}
.tag{display:inline-block;background:var(--bg2);border:1px solid var(--line);border-radius:8px;padding:4px 9px;font-size:12.5px;margin:0 6px 6px 0;cursor:pointer}
.tag:hover{border-color:var(--accent);color:var(--accent2)}
audio{width:100%;margin-top:12px;filter:invert(.92) hue-rotate(180deg)}
.hint{font-size:12.5px;color:var(--muted);margin-top:6px}
.hr{height:1px;background:var(--line);margin:26px 0}
.center{text-align:center}
.hero{padding:56px 0 30px}
.hero h1{font-size:40px;line-height:1.12}
.hero .foxbig{font-size:52px}
.env{display:inline-flex;align-items:center;gap:8px;background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:8px 14px;font-size:13.5px}