:root{
  --bg:#070b14; --bg-2:#0b1220; --card:rgba(17,26,45,.78); --line:rgba(148,163,184,.16);
  --ink:#e8eefc; --muted:#94a3b8; --accent:#22d3ee; --accent-2:#818cf8;
  --ok:#34d399; --warn:#fbbf24; --bad:#fb7185; --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:
    radial-gradient(900px 520px at 12% -8%,rgba(34,211,238,.16),transparent 60%),
    radial-gradient(760px 480px at 92% 4%,rgba(129,140,248,.18),transparent 60%),
    var(--bg);
  color:var(--ink);font:15px/1.6 'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;min-height:100vh;
}
a{color:#7dd3fc;text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(1160px,92vw);margin:0 auto}

/* header */
.site-head{position:sticky;top:0;z-index:50;background:rgba(7,11,20,.72);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.head-in{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 0}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;letter-spacing:-.02em}
.brand:hover{text-decoration:none}
.brand-mark{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;color:#04121c;background:linear-gradient(135deg,var(--accent),var(--accent-2));box-shadow:0 10px 24px -12px rgba(34,211,238,.8)}
.brand-text{font-size:18px}.brand-text span{color:var(--accent)}
.nav{display:flex;gap:6px;flex-wrap:wrap}
.nav a{color:var(--muted);font-size:13.5px;font-weight:600;padding:8px 12px;border-radius:10px}
.nav a:hover,.nav a.active{color:var(--ink);background:rgba(148,163,184,.12);text-decoration:none}

/* hero */
.hero{padding:64px 0 12px;text-align:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#a5b4fc;margin:0 0 18px}
.eyebrow .dot{width:7px;height:7px;border-radius:99px;background:var(--accent);box-shadow:0 0 0 4px rgba(34,211,238,.15)}
.hero h1{font-size:clamp(32px,5vw,54px);line-height:1.08;letter-spacing:-.03em;margin:0 0 14px;font-weight:800}
.hero h1 .grad{background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.lede{max-width:640px;margin:0 auto 28px;color:var(--muted);font-size:16px}

/* lookup card */
.lookup-card{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--line);border-radius:22px;padding:16px;box-shadow:0 40px 90px -50px rgba(0,0,0,.9);backdrop-filter:blur(10px)}
.you{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:4px 6px 12px;border-bottom:1px dashed var(--line);margin-bottom:12px}
.you-label{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.you-ip{font:inherit;font-weight:800;font-size:15px;color:var(--accent);background:rgba(34,211,238,.08);border:1px solid rgba(34,211,238,.25);padding:6px 12px;border-radius:99px;cursor:pointer}
.you-ip:hover{background:rgba(34,211,238,.14)}
.search{display:flex;gap:10px;flex-wrap:wrap}
.search input{flex:1 1 280px;height:52px;padding:0 18px;border-radius:14px;border:1px solid var(--line);background:rgba(2,6,23,.55);color:var(--ink);font:inherit;font-size:15px}
.search input::placeholder{color:#64748b}
.search input:focus{outline:none;border-color:rgba(34,211,238,.65);box-shadow:0 0 0 4px rgba(34,211,238,.12)}
.btn{height:52px;padding:0 22px;border-radius:14px;border:0;font:inherit;font-weight:700;cursor:pointer;white-space:nowrap;transition:transform .08s ease,filter .15s ease}
.btn:active{transform:translateY(1px)}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#04121c;box-shadow:0 16px 34px -18px rgba(34,211,238,.85)}
.btn-primary:hover{filter:brightness(1.06)}
.btn-ghost{background:rgba(148,163,184,.10);color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{background:rgba(148,163,184,.16)}
.btn[disabled]{opacity:.6;cursor:not-allowed}
.hint{margin:10px 6px 2px;font-size:12.5px;color:var(--muted)}
.hint.bad{color:var(--bad)}

/* results */
.results{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;padding:28px 0 10px;align-items:start}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 30px 70px -55px rgba(0,0,0,.95);overflow:hidden}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:16px 18px;border-bottom:1px solid var(--line)}
.card-head h2{font-size:14px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0;font-weight:800}
.badge{font-size:11.5px;font-weight:800;padding:4px 10px;border-radius:99px;background:rgba(34,211,238,.12);color:#67e8f9;border:1px solid rgba(34,211,238,.28)}
.badge-muted{background:rgba(148,163,184,.12);color:var(--muted);border-color:var(--line)}
.badge.ok{background:rgba(52,211,153,.12);color:#6ee7b7;border-color:rgba(52,211,153,.3)}
.badge.bad{background:rgba(251,113,133,.12);color:#fda4af;border-color:rgba(251,113,133,.3)}

.kv{margin:0;padding:6px 18px 14px}
.kv>div{display:grid;grid-template-columns:170px 1fr;gap:14px;padding:12px 0;border-bottom:1px solid rgba(148,163,184,.09)}
.kv>div:last-child{border-bottom:0}
.kv dt{color:var(--muted);font-size:12.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase}
.kv dd{margin:0;font-weight:600;word-break:break-word}
.flag{margin-right:6px}
.raw{border-top:1px solid var(--line);padding:12px 18px 16px}
.raw summary{cursor:pointer;color:var(--muted);font-size:12.5px;font-weight:700}
.raw summary:hover{color:var(--ink)}
.raw pre{margin:12px 0 0;background:rgba(2,6,23,.65);border:1px solid var(--line);border-radius:12px;padding:14px;overflow:auto;max-height:260px}
.raw code{font:12.5px/1.55 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:#bae6fd}

.map{height:392px;background:rgba(2,6,23,.5)}
.map-note{margin:0;padding:10px 18px 14px;color:var(--muted);font-size:12px}
.leaflet-container{font-family:inherit;background:#0b1220}
.leaflet-popup-content{color:#0f172a}

/* skeleton */
.skeleton{padding:18px}
.sk-line{height:14px;border-radius:8px;background:linear-gradient(90deg,rgba(148,163,184,.10),rgba(148,163,184,.22),rgba(148,163,184,.10));background-size:200% 100%;animation:sk 1.2s infinite;margin:10px 0}
.sk-line.w60{width:60%}.sk-line.w80{width:80%}.sk-line.w40{width:40%}
@keyframes sk{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* content */
.content{padding:34px 0 40px}
.prose{max-width:820px;margin:0 auto}
.prose h2{font-size:22px;letter-spacing:-.02em;margin:30px 0 10px}
.prose p,.prose li{color:#c3cede;font-size:15px}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin:6px 0}
.prose strong{color:var(--ink)}

/* footer */
.site-foot{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:13px}
.foot-in{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.foot-links{display:flex;gap:16px}

@media (max-width:900px){
  .results{grid-template-columns:1fr}
  .map{height:320px}
  .kv>div{grid-template-columns:1fr;gap:2px}
  .hero{padding:44px 0 8px}
  .head-in{padding:12px 0}
  .nav a{padding:6px 9px;font-size:12.5px}
}
@media (max-width:560px){
  .you{flex-direction:column;align-items:flex-start}
  .search input,.btn{height:48px}
  .btn{flex:1}
}

/* mobile fixes */
html,body{overflow-x:hidden}
@media (max-width:700px){
  .head-in{flex-wrap:wrap;justify-content:space-between;row-gap:8px}
  .nav{width:100%;justify-content:flex-start;overflow-x:auto;white-space:nowrap;padding-bottom:2px}
  .nav a{flex:none}
  .hero h1{font-size:clamp(28px,9vw,34px)}
  .lede{font-size:14.5px;padding:0 6px}
  .search{flex-direction:column}
  .search input{flex:none;width:100%}
  .search .btn{width:100%;flex:none}
  .you{flex-direction:column;align-items:flex-start;gap:8px}
  .you-ip{width:100%;text-align:center}
  .hero{padding:36px 0 6px}
}

/* long IPv6 in chip */
.you-ip{max-width:100%;white-space:normal;overflow-wrap:anywhere;word-break:break-all;text-align:left;line-height:1.35}
@media (max-width:700px){
  .you-ip{font-size:13px;padding:8px 12px}
  .hero h1{max-width:100%;overflow-wrap:break-word}
}

.hint{overflow-wrap:anywhere}
.kv dd{overflow-wrap:anywhere}

/* legal / child pages */
.page-head{padding:54px 0 10px}
.page-head h1{font-size:clamp(30px,5vw,46px);letter-spacing:-.03em;line-height:1.1;margin:0 0 10px;font-weight:800}
.page-head .lede{margin:0;max-width:680px}
.legal{max-width:850px;margin:0 auto;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:30px 34px;box-shadow:0 30px 70px -55px rgba(0,0,0,.95)}
.legal h2{font-size:20px;margin:26px 0 8px;letter-spacing:-.01em;color:var(--ink)}
.legal h3{font-size:16px;margin:22px 0 6px;color:var(--ink)}
.legal p,.legal li{color:#c3cede;font-size:14.8px}
.legal a{color:#7dd3fc}
.page-body{padding:14px 0 48px}
@media(max-width:700px){
  .page-head{padding:34px 0 6px}
  .legal{padding:22px 18px}
}

/* hai card cao bang nhau */
.results{align-items:stretch}
.results>.card{display:flex;flex-direction:column;height:100%}
.map-card .map{flex:1 1 auto;height:auto;min-height:392px}
@media(max-width:900px){
  .map-card .map{flex:none;height:320px;min-height:0}
}

.page-head h1 .grad{background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}