/* CryptoAI Việt – congnghe.nguyendaiha.com */
:root{
  --bg:#0a0f1e;--bg2:#0f1629;--card:#131b31;--card2:#18223d;--line:rgba(148,163,184,.16);
  --tx:#e7ecf5;--mut:#94a3b8;--btc:#f7931a;--ai:#8b5cf6;--cy:#22d3ee;--up:#22c55e;--dn:#ef4444;--gold:#fbbf24;
  --r:16px;--sh:0 10px 30px rgba(0,0,0,.35)
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Be Vietnam Pro",Inter,system-ui,sans-serif;background:
  radial-gradient(900px 500px at 0% -10%,rgba(247,147,26,.12),transparent 60%),
  radial-gradient(900px 600px at 100% 0%,rgba(139,92,246,.14),transparent 60%),var(--bg);
  color:var(--tx);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%;height:auto;display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:10px;top:10px;background:#fff;color:#000;padding:8px;z-index:99}

/* ticker */
.ticker{background:#060a15;border-bottom:1px solid var(--line);overflow:hidden;white-space:nowrap;font-size:13px}
.ticker .track{display:inline-flex;gap:28px;padding:8px 0;animation:tk 60s linear infinite}
.ticker:hover .track{animation-play-state:paused}
.ticker span b{color:#fff;margin-right:6px}
@keyframes tk{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.up{color:var(--up)}.dn{color:var(--dn)}

/* header */
header{position:sticky;top:0;z-index:30;background:rgba(10,15,30,.86);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.01em}
.logo i{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font-style:normal;font-weight:900;color:#0a0f1e;background:linear-gradient(135deg,var(--btc),var(--ai))}
.logo small{display:block;font-size:11px;font-weight:500;color:var(--mut);letter-spacing:.02em}
nav.main{display:flex;gap:4px}
nav.main a{padding:8px 12px;border-radius:10px;font-weight:600;font-size:15px;color:#cbd5e1}
nav.main a:hover,nav.main a.on{background:var(--card2);color:#fff}
.menu-btn{display:none;background:var(--card2);border:1px solid var(--line);color:#fff;border-radius:10px;padding:8px 12px;font:inherit;font-weight:700;cursor:pointer}
@media(max-width:980px){
  nav.main{display:none;position:absolute;left:0;right:0;top:64px;flex-direction:column;background:var(--bg2);padding:10px 20px 18px;border-bottom:1px solid var(--line)}
  nav.main.open{display:flex}.menu-btn{display:block}
}

/* buttons, tags */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:12px;font-weight:700;border:1px solid transparent;transition:transform .15s,box-shadow .15s;cursor:pointer;font-size:15px}
.btn:hover{transform:translateY(-2px)}
.btn-btc{background:linear-gradient(135deg,var(--btc),#ffb347);color:#1a1205;box-shadow:0 8px 24px rgba(247,147,26,.3)}
.btn-ai{background:linear-gradient(135deg,var(--ai),var(--cy));color:#fff;box-shadow:0 8px 24px rgba(139,92,246,.3)}
.btn-gh{background:var(--card2);border-color:var(--line);color:#fff}
.tag{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;padding:4px 10px;border-radius:99px}
.tag.bitcoin{background:rgba(247,147,26,.14);color:var(--btc)}
.tag.ai{background:rgba(139,92,246,.18);color:#c4b5fd}
.tag.chinh-sach{background:rgba(34,211,238,.14);color:var(--cy)}

/* layout */
main{min-height:60vh}
section{padding:46px 0}
.sec-h{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:20px;flex-wrap:wrap}
.sec-h h2{font-size:clamp(22px,3vw,30px);font-weight:800;letter-spacing:-.01em}
.sec-h p{color:var(--mut)}
.sec-h a{color:var(--cy);font-weight:700}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:980px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--sh)}

/* hero */
.hero{padding:44px 0 20px}
.hero .wrap{display:grid;grid-template-columns:1.25fr 1fr;gap:28px;align-items:center}
@media(max-width:900px){.hero .wrap{grid-template-columns:1fr}}
.hero h1{font-size:clamp(30px,4.6vw,50px);line-height:1.12;font-weight:900;letter-spacing:-.02em}
.grad{background:linear-gradient(90deg,var(--btc),var(--gold) 40%,var(--ai) 75%,var(--cy));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{color:#cbd5e1;font-size:18px;margin:16px 0 22px;max-width:620px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.stat small{color:var(--mut);font-size:13px;display:block}
.stat b{font-size:22px;display:block;margin-top:2px}
.stat em{font-style:normal;font-size:13px}
.live{display:inline-flex;align-items:center;gap:6px;color:var(--mut);font-size:13px;margin-top:10px}
.live:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--up);box-shadow:0 0 0 0 rgba(34,197,94,.6);animation:pulse 1.8s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 8px rgba(34,197,94,0)}100%{box-shadow:0 0 0 0 rgba(34,197,94,0)}}

/* market table */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--card)}
table.mk{width:100%;border-collapse:collapse;font-size:15px;min-width:640px}
.mk th,.mk td{padding:12px 14px;text-align:right;border-bottom:1px solid var(--line);white-space:nowrap}
.mk th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--mut);font-weight:700;background:var(--bg2);position:sticky;top:0}
.mk th:nth-child(-n+2),.mk td:nth-child(-n+2){text-align:left}
.mk tr:hover td{background:rgba(255,255,255,.02)}
.mk .coin{display:flex;align-items:center;gap:10px}
.mk .coin img{width:24px;height:24px;border-radius:50%}
.mk .coin small{color:var(--mut);text-transform:uppercase}
.mk tr.hl td{background:rgba(251,191,36,.07)}
.tools{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.tools input{flex:1;min-width:200px;background:var(--card);border:1px solid var(--line);color:#fff;border-radius:12px;padding:11px 14px;font:inherit}
.seg{display:inline-flex;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:3px}
.seg button{background:none;border:0;color:var(--mut);font:inherit;font-weight:700;padding:7px 12px;border-radius:9px;cursor:pointer}
.seg button.on{background:var(--card2);color:#fff}
.note{color:var(--mut);font-size:13px;margin-top:10px}

/* fear & greed */
.fg{display:flex;align-items:center;gap:16px}
.fg .dial{width:84px;height:84px;border-radius:50%;display:grid;place-items:center;font-size:26px;font-weight:900;background:conic-gradient(var(--c,#fbbf24) calc(var(--v,50)*1%),rgba(255,255,255,.08) 0)}
.fg .dial span{width:66px;height:66px;border-radius:50%;background:var(--card);display:grid;place-items:center}

/* post cards */
.pc{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:transform .2s,border-color .2s}
.pc:hover{transform:translateY(-4px);border-color:rgba(148,163,184,.35)}
.pc .th{aspect-ratio:16/9;background:var(--bg2);overflow:hidden}
.pc .th img{width:100%;height:100%;object-fit:cover}
.pc .bd{padding:16px 18px 18px;display:flex;flex-direction:column;gap:8px;flex:1}
.pc .tag{align-self:flex-start}
.pc h3{font-size:18px;line-height:1.35;font-weight:700}
.pc p{color:var(--mut);font-size:14.5px;flex:1}
.pc small{color:var(--mut);font-size:13px}
.pc.big{grid-column:span 2}.pc.big h3{font-size:24px}
@media(max-width:640px){.pc.big{grid-column:auto}.pc.big h3{font-size:20px}}

/* app promo */
.promo{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;padding:28px;border-radius:22px;border:1px solid rgba(251,191,36,.35);
  background:radial-gradient(600px 300px at 100% 0%,rgba(251,191,36,.18),transparent 60%),linear-gradient(135deg,#1a1730,#141c33)}
.promo h2,.promo h3{font-size:clamp(20px,2.6vw,28px);font-weight:800;line-height:1.25}
.promo p{color:#cbd5e1;margin:8px 0 16px}
.promo .ic{width:120px;height:120px}
@media(max-width:640px){.promo{grid-template-columns:1fr}.promo .ic{display:none}}
.badge-row{display:flex;gap:10px;flex-wrap:wrap}

/* article */
.crumb{color:var(--mut);font-size:14px;margin:26px 0 0}.crumb a{color:var(--cy)}
.art{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:36px;padding:20px 0 50px}
@media(max-width:1000px){.art{grid-template-columns:1fr}}
.art h1{font-size:clamp(28px,4.2vw,42px);line-height:1.18;font-weight:900;letter-spacing:-.015em;margin:12px 0}
.art .meta{color:var(--mut);font-size:14px}
.art .lead{font-size:19px;color:#dbe3ef;margin:18px 0}
.art figure{margin:22px 0;border-radius:18px;overflow:hidden;border:1px solid var(--line)}
.art figcaption{font-size:13px;color:var(--mut);padding:10px 14px;background:var(--bg2)}
.prose h2{font-size:25px;font-weight:800;margin:34px 0 10px;scroll-margin-top:84px}
.prose p{margin:12px 0;font-size:17.5px;color:#dbe3ef}
.prose ul{margin:12px 0 12px 22px;font-size:17.5px;color:#dbe3ef}.prose li{margin:6px 0}
.prose a{color:var(--cy);text-decoration:underline}
.key{background:linear-gradient(135deg,rgba(247,147,26,.1),rgba(139,92,246,.1));border:1px solid var(--line);border-left:4px solid var(--btc);border-radius:14px;padding:16px 18px;margin:22px 0}
.key b{display:block;margin-bottom:6px}
.key ul{margin-left:20px}
.src{font-size:14px;color:var(--mut);border-top:1px solid var(--line);margin-top:30px;padding-top:16px}
.src a{color:var(--cy)}
.src li{margin:4px 0}
aside .sticky{position:sticky;top:84px;display:flex;flex-direction:column;gap:16px}
.toc{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.toc b{display:block;margin-bottom:8px;font-size:14px;text-transform:uppercase;letter-spacing:.06em;color:var(--mut)}
.toc ol{margin-left:18px;font-size:14.5px}.toc li{margin:6px 0}.toc a:hover{color:var(--cy)}
.mini{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.mini h4{font-size:14px;text-transform:uppercase;letter-spacing:.06em;color:var(--mut);margin-bottom:8px}
.mini .row{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
.mini .row:last-child{border:0}
.disc{font-size:13px;color:var(--mut);background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-top:22px}

/* page content */
.page{max-width:860px;margin:0 auto;padding:36px 20px 60px}
.page h1{font-size:clamp(28px,4.2vw,42px);font-weight:900;line-height:1.18;margin:10px 0 14px;letter-spacing:-.015em}
.page h2{font-size:24px;font-weight:800;margin:32px 0 10px;scroll-margin-top:84px}
.page h3{font-size:19px;font-weight:700;margin:20px 0 6px}
.page p,.page li{color:#dbe3ef;font-size:17px}
.page p{margin:10px 0}.page ul,.page ol{margin:10px 0 10px 22px}.page li{margin:6px 0}
.page a{color:var(--cy)}
.timeline{border-left:2px solid var(--line);margin:16px 0 16px 8px;padding-left:20px}
.timeline .it{position:relative;margin:0 0 18px}
.timeline .it:before{content:"";position:absolute;left:-27px;top:7px;width:12px;height:12px;border-radius:50%;background:var(--cy);box-shadow:0 0 0 4px rgba(34,211,238,.15)}
.timeline .it b{color:#fff}.timeline .it small{display:block;color:var(--cy);font-weight:700}
.steps{counter-reset:s;list-style:none;margin-left:0!important}
.steps li{counter-increment:s;position:relative;padding-left:46px;margin:14px 0!important}
.steps li:before{content:counter(s);position:absolute;left:0;top:0;width:32px;height:32px;border-radius:10px;background:var(--card2);border:1px solid var(--line);display:grid;place-items:center;font-weight:800;color:var(--gold)}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:10px 0}
.faq summary{cursor:pointer;font-weight:700}
.faq details p{margin-top:8px}

/* footer */
footer{border-top:1px solid var(--line);background:#070b17;padding:40px 0 30px;margin-top:30px;font-size:14.5px;color:var(--mut)}
footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:24px}
@media(max-width:800px){footer .cols{grid-template-columns:1fr 1fr}}
footer h4{color:#fff;font-size:14px;text-transform:uppercase;letter-spacing:.06em;margin-bottom:10px}
footer a{display:block;padding:3px 0}footer a:hover{color:#fff}
footer .bottom{border-top:1px solid var(--line);margin-top:26px;padding-top:16px;font-size:13px}