:root{
  --bg:#f7f8f6;--surface:#fff;--ink:#1c2420;--muted:#5d6b64;--line:#e3e8e4;
  --brand:#0f766e;--brand-ink:#fff;--brand-soft:#e3f3f0;--warn:#b45309;--warn-soft:#fef3e2;--bad:#b42318;--bad-soft:#fdecea;--ok:#157f3b;--ok-soft:#e5f6ea;
  --radius:14px;--shadow:0 1px 2px rgba(20,40,30,.06),0 8px 24px rgba(20,40,30,.06);
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0f1512;--surface:#18201c;--ink:#e8efea;--muted:#9fb0a7;--line:#2a352f;--brand:#2dd4bf;--brand-ink:#04211d;--brand-soft:#12312d;
  --warn:#f5b04c;--warn-soft:#33260f;--bad:#ff8a7a;--bad-soft:#3a1814;--ok:#5fd488;--ok-soft:#12301d;--shadow:0 1px 2px rgba(0,0,0,.4);}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--brand)}
img{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header.top{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;gap:12px}
.logo{font-weight:800;font-size:19px;letter-spacing:-.2px;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:8px}
.logo i{width:26px;height:26px;border-radius:8px;background:var(--brand);display:inline-block;position:relative}
.logo i::after{content:"";position:absolute;left:7px;top:8px;width:12px;height:8px;border:2px solid var(--brand-ink);border-radius:4px}
nav.links{display:flex;gap:18px;align-items:center}
nav.links a.l{color:var(--muted);text-decoration:none;font-size:15px}
nav.links a.l:hover{color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--brand);background:var(--brand);color:var(--brand-ink);padding:10px 18px;border-radius:999px;font:inherit;font-weight:600;cursor:pointer;text-decoration:none;min-height:44px}
.btn:hover{filter:brightness(1.06)}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn.ghost{background:transparent;color:var(--brand)}
.btn.small{padding:6px 14px;min-height:36px;font-size:14px}
.hero{padding:64px 0 40px}
.hero h1{font-size:clamp(30px,5vw,50px);line-height:1.12;margin:0 0 16px;letter-spacing:-1px}
.hero p.lead{font-size:clamp(17px,2.2vw,20px);color:var(--muted);max-width:640px;margin:0 0 26px}
.grid2{display:grid;grid-template-columns:1.05fr .95fr;gap:32px;align-items:start}
@media(max-width:860px){.grid2{grid-template-columns:1fr}}
section{padding:44px 0}
section h2{font-size:clamp(24px,3.4vw,34px);margin:0 0 8px;letter-spacing:-.5px}
section p.sub{color:var(--muted);margin:0 0 24px;max-width:640px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:760px){.steps{grid-template-columns:1fr}}
.step b.n{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--brand-soft);color:var(--brand);font-weight:800;margin-bottom:10px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1px solid var(--line);background:var(--surface);padding:6px 12px;border-radius:999px;font-size:14px}
.chip.vn{border-color:var(--brand);color:var(--brand)}
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:860px){.plans{grid-template-columns:1fr}}
.plan.hot{border-color:var(--brand);box-shadow:0 0 0 2px var(--brand-soft),var(--shadow)}
.plan h3{margin:0 0 4px}
.price{font-size:30px;font-weight:800;letter-spacing:-1px}
.price small{font-size:14px;font-weight:500;color:var(--muted)}
.plan ul{padding-left:18px;color:var(--muted);margin:12px 0 16px}
details{border-bottom:1px solid var(--line);padding:14px 0}
details summary{cursor:pointer;font-weight:600}
details p{color:var(--muted);margin:8px 0 0}
footer{border-top:1px solid var(--line);padding:28px 0;color:var(--muted);font-size:14px}
label{display:block;font-weight:600;margin:14px 0 6px;font-size:14px}
input[type=text],input[type=email],select,textarea{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink);font:inherit}
input:focus,select:focus,textarea:focus{outline:2px solid var(--brand);outline-offset:1px}
textarea{min-height:160px;resize:vertical}
.hint{color:var(--muted);font-size:13px;margin-top:4px}
.chat{display:flex;flex-direction:column;height:430px}
.chat .msgs{flex:1;overflow-y:auto;padding:4px 2px;display:flex;flex-direction:column;gap:10px}
.bub{max-width:86%;padding:10px 14px;border-radius:16px;white-space:pre-wrap;word-wrap:break-word;line-height:1.5}
.bub.u{align-self:flex-end;background:var(--brand);color:var(--brand-ink);border-bottom-right-radius:4px}
.bub.a{align-self:flex-start;background:var(--brand-soft);border-bottom-left-radius:4px}
.bub.e{align-self:center;background:var(--warn-soft);color:var(--warn);font-size:14px}
.chat form{display:flex;gap:8px;margin-top:10px}
.chat form input{flex:1}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.sugg{display:flex;gap:6px;flex-wrap:wrap;margin:8px 0}
.sugg button{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:5px 11px;cursor:pointer;font:inherit;font-size:13px}
.sugg button:hover{border-color:var(--brand);color:var(--brand)}
.tabs{display:flex;gap:6px;flex-wrap:wrap;border-bottom:1px solid var(--line);margin:18px 0}
.tabs button{border:0;background:none;padding:10px 14px;cursor:pointer;color:var(--muted);font:inherit;font-weight:600;border-bottom:3px solid transparent;margin-bottom:-1px}
.tabs button[aria-selected=true]{color:var(--brand);border-bottom-color:var(--brand)}
.bar{height:10px;background:var(--line);border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--brand);border-radius:99px}
.bar.hot i{background:var(--warn)}
.kpi{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
@media(max-width:700px){.kpi{grid-template-columns:1fr}}
.kpi .card b{display:block;font-size:26px;letter-spacing:-.5px}
.pill{display:inline-block;padding:2px 10px;border-radius:99px;font-size:13px;font-weight:600;background:var(--brand-soft);color:var(--brand)}
.pill.warn{background:var(--warn-soft);color:var(--warn)}
.pill.bad{background:var(--bad-soft);color:var(--bad)}
.pill.ok{background:var(--ok-soft);color:var(--ok)}
pre.code{background:#0f1a16;color:#d6f5ec;padding:14px;border-radius:10px;overflow:auto;font-size:13px;white-space:pre-wrap;word-break:break-all}
.notice{padding:12px 14px;border-radius:10px;background:var(--warn-soft);color:var(--warn);font-size:14px;margin:12px 0}
.notice.ok{background:var(--ok-soft);color:var(--ok)}
.notice.bad{background:var(--bad-soft);color:var(--bad)}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.55);display:grid;place-items:center;padding:16px;z-index:50}
.modal[hidden]{display:none}
.modal .card{max-width:520px;width:100%}
.keybox{font-family:ui-monospace,Consolas,monospace;background:var(--bg);border:1px dashed var(--brand);padding:10px;border-radius:8px;word-break:break-all;margin:8px 0}
.qr{display:grid;place-items:center;gap:10px;text-align:center}
.qr img{width:280px;height:auto;border-radius:12px;border:1px solid var(--line);background:#fff}
.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:10px 18px;border-radius:999px;font-size:14px;z-index:60}
.toast[hidden]{display:none}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}