:root{
  --bg:#ffffff; --bg2:#f6f7fb; --fg:#10131f; --muted:#5b6275; --line:#e4e7f0;
  --brand:#4f46e5; --brand-ink:#ffffff; --brand-soft:#eef0ff; --ok:#0f9d6b; --warn:#b45309; --warn-bg:#fff7e6;
  --shadow:0 1px 2px rgba(16,19,31,.06),0 12px 32px rgba(16,19,31,.10);
  --r:14px;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0d1020;--bg2:#141830;--fg:#eef0fa;--muted:#a3abc4;--line:#262c4b;--brand:#7c78ff;--brand-ink:#0d1020;--brand-soft:#1b2048;--warn-bg:#2a2210;--warn:#f3b95f;--shadow:0 1px 2px rgba(0,0,0,.4),0 12px 32px rgba(0,0,0,.45)}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand)}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
header.nav{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:20px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--fg);text-decoration:none}
.logo i{width:30px;height:30px;border-radius:8px;background:var(--brand);display:grid;place-items:center}
.logo svg{width:18px;height:18px}
.nav nav{margin-left:auto;display:flex;gap:22px;align-items:center}
.nav nav a{color:var(--muted);text-decoration:none;font-size:15px}
.nav nav a:hover{color:var(--fg)}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:10px;padding:11px 18px;font-weight:600;text-decoration:none;border:1px solid transparent;font-size:15px;cursor:pointer}
.btn.primary{background:var(--brand);color:var(--brand-ink)}
.btn.primary:hover{filter:brightness(1.08)}
.btn.ghost{border-color:var(--line);color:var(--fg);background:var(--bg)}
.btn.ghost:hover{background:var(--bg2)}
@media(max-width:820px){.nav nav a:not(.btn){display:none}}
.hero{padding:72px 0 40px;background:radial-gradient(900px 420px at 80% -10%,var(--brand-soft),transparent 70%)}
.hero .grid{display:grid;grid-template-columns:1.05fr 1fr;gap:44px;align-items:center}
@media(max-width:900px){.hero .grid{grid-template-columns:1fr}}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;color:var(--brand);background:var(--brand-soft);padding:5px 12px;border-radius:99px;margin-bottom:18px}
h1{font-size:clamp(34px,5vw,54px);line-height:1.12;margin:0 0 18px;letter-spacing:-.02em}
h1 em{font-style:normal;color:var(--brand)}
.lead{font-size:19px;color:var(--muted);margin:0 0 28px;max-width:34em}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.shot{border-radius:var(--r);border:1px solid var(--line);box-shadow:var(--shadow);overflow:hidden;background:var(--bg2)}
.shot figcaption{padding:10px 14px;font-size:13px;color:var(--muted);border-top:1px solid var(--line);background:var(--bg)}
figure{margin:0}
.facts{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:36px 0 0}
@media(max-width:760px){.facts{grid-template-columns:repeat(2,1fr)}}
.fact{padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--bg)}
.fact b{display:block;font-size:28px;letter-spacing:-.02em}
.fact span{color:var(--muted);font-size:14px}
section{padding:72px 0}
section.alt{background:var(--bg2)}
h2{font-size:clamp(26px,3.4vw,38px);line-height:1.2;margin:0 0 12px;letter-spacing:-.015em}
.sub{color:var(--muted);font-size:18px;margin:0 0 36px;max-width:42em}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:900px){.cards{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.cards{grid-template-columns:1fr}}
.card{border:1px solid var(--line);border-radius:var(--r);padding:22px;background:var(--bg)}
.card h3{margin:10px 0 6px;font-size:18px}
.card p{margin:0;color:var(--muted);font-size:15px}
.ic{width:40px;height:40px;border-radius:10px;background:var(--brand-soft);display:grid;place-items:center;font-size:20px}
.row{display:grid;grid-template-columns:1fr 1.15fr;gap:48px;align-items:center;margin:0 0 72px}
.row:last-child{margin-bottom:0}
.row.rev{grid-template-columns:1.15fr 1fr}
.row.rev .txt{order:2}
@media(max-width:900px){.row,.row.rev{grid-template-columns:1fr;gap:22px;margin-bottom:52px}.row.rev .txt{order:0}}
.txt h3{font-size:26px;margin:0 0 10px;letter-spacing:-.01em}
.txt p{color:var(--muted);margin:0 0 14px}
.txt ul{margin:0;padding-left:20px;color:var(--muted)}
.txt li{margin:6px 0}
.tag{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--brand);margin-bottom:8px}
.mods{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
@media(max-width:900px){.mods{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.mods{grid-template-columns:1fr}}
.mod{border:1px solid var(--line);border-radius:12px;padding:18px;background:var(--bg)}
.mod h4{margin:0 0 8px;font-size:15px;color:var(--brand)}
.mod p{margin:0;font-size:14px;color:var(--muted);line-height:1.55}
.phones{display:flex;gap:22px;justify-content:center}
.phones img{width:min(44%,230px);border-radius:26px;border:1px solid var(--line);box-shadow:var(--shadow)}
.honest{border:1px solid var(--line);border-left:4px solid var(--warn);background:var(--warn-bg);border-radius:12px;padding:20px 22px}
.honest h3{margin:0 0 8px;font-size:18px}
table{width:100%;border-collapse:collapse;font-size:15px;margin-top:20px;background:var(--bg);border:1px solid var(--line);border-radius:12px;overflow:hidden}
th,td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:var(--bg2);font-size:13px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
tr:last-child td{border-bottom:0}
.pill{display:inline-block;padding:2px 10px;border-radius:99px;font-size:12px;font-weight:700}
.pill.ok{background:color-mix(in srgb,var(--ok) 16%,transparent);color:var(--ok)}
.pill.mid{background:var(--brand-soft);color:var(--brand)}
.pill.no{background:var(--warn-bg);color:var(--warn)}
.scroll{overflow-x:auto}
details{border:1px solid var(--line);border-radius:12px;padding:14px 18px;background:var(--bg);margin:10px 0}
summary{cursor:pointer;font-weight:600}
details p{color:var(--muted);margin:10px 0 2px}
.banner{background:var(--brand);color:var(--brand-ink);border-radius:20px;padding:44px 32px;text-align:center}
.banner h2{margin-bottom:10px}
.banner p{margin:0 auto 22px;max-width:36em;opacity:.92}
.banner .btn.primary{background:var(--brand-ink);color:var(--brand)}
.banner .btn.ghost{background:transparent;color:var(--brand-ink);border-color:color-mix(in srgb,var(--brand-ink) 45%,transparent)}
footer{border-top:1px solid var(--line);padding:30px 0 44px;color:var(--muted);font-size:14px}
footer .wrap{display:flex;gap:20px;flex-wrap:wrap;justify-content:space-between}
footer a{color:var(--muted)}
.skip{position:absolute;left:-999px}
.skip:focus{left:10px;top:10px;background:var(--bg);padding:8px 12px;z-index:50}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
/* ===== trang tính năng ===== */
.crumbs{font-size:14px;color:var(--muted);margin:0 0 14px}
.crumbs a{color:var(--muted)}
.phero{padding:56px 0 28px;background:radial-gradient(900px 380px at 85% -20%,var(--brand-soft),transparent 70%)}
.phero h1{font-size:clamp(30px,4.4vw,46px)}
.phero .lead{max-width:44em}
.layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:48px;align-items:start;padding:36px 0 72px}
@media(max-width:960px){.layout{grid-template-columns:1fr;gap:20px}}
.toc{position:sticky;top:84px;font-size:14px;border-left:2px solid var(--line);padding-left:16px}
.toc b{display:block;margin-bottom:8px;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.05em}
.toc a{display:block;color:var(--muted);text-decoration:none;padding:5px 0}
.toc a:hover{color:var(--brand)}
@media(max-width:960px){.toc{position:static;border:1px solid var(--line);border-radius:12px;padding:14px 16px;background:var(--bg2)}}
.prose{max-width:760px}
.prose h2{font-size:28px;margin:52px 0 10px;scroll-margin-top:84px}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:19px;margin:26px 0 6px}
.prose p{margin:0 0 14px}
.prose ul,.prose ol{padding-left:22px;margin:0 0 16px}
.prose li{margin:6px 0}
.prose .shot{margin:22px 0}
.callout{border:1px solid var(--line);border-left:4px solid var(--brand);background:var(--brand-soft);border-radius:12px;padding:16px 18px;margin:20px 0}
.callout.warn{border-left-color:var(--warn);background:var(--warn-bg)}
.callout p{margin:0}
.callout strong:first-child{display:block;margin-bottom:4px}
.fgrid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:18px 0}
@media(max-width:640px){.fgrid{grid-template-columns:1fr}}
.fgrid .card{padding:18px}
.fgrid .card h3{margin:0 0 6px;font-size:16px}
.fgrid .card p{font-size:14.5px}
.qa{border:1px solid var(--line);border-radius:12px;padding:14px 18px;background:var(--bg);margin:10px 0}
.qa summary{cursor:pointer;font-weight:600}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:48px}
.pn a{display:block;border:1px solid var(--line);border-radius:12px;padding:14px 18px;text-decoration:none;color:var(--fg)}
.pn a small{display:block;color:var(--muted)}
.pn a:hover{background:var(--bg2)}
.pn a:last-child{text-align:right}
.gcards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:900px){.gcards{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.gcards{grid-template-columns:1fr}}
.gcard{display:block;border:1px solid var(--line);border-radius:var(--r);padding:22px;background:var(--bg);text-decoration:none;color:var(--fg);transition:transform .15s,box-shadow .15s}
.gcard:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.gcard .ic{margin-bottom:10px}
.gcard h3{margin:0 0 6px;font-size:18px}
.gcard p{margin:0 0 10px;color:var(--muted);font-size:14.5px}
.gcard span{color:var(--brand);font-size:14px;font-weight:600}