/* AI School — giao diện navy & vàng sang trọng */
:root{
  --ink:#6B0F1A;--navy:#8E1B24;--navy2:#A52A35;--gold:#C9A227;--gold2:#E2C25B;--gold-soft:#FBF4E2;
  --ivory:#FBF7F1;--paper:#FFFFFF;--line:#ECE2D6;--txt:#2B2320;--mut:#6B5F58;--ok:#1C7C4F;--warn:#A86A00;--bad:#B3261E;
  --r:18px;--shadow:0 10px 30px rgba(94,15,23,.08);--shadow2:0 24px 60px rgba(94,15,23,.18);
  --serif:"Lora",Georgia,serif;--sans:"Be Vietnam Pro",system-ui,Segoe UI,Roboto,sans-serif
}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;font-family:var(--sans);color:var(--txt);background:var(--ivory);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--navy2)}img{max-width:100%}
h1,h2,h3{font-family:var(--serif);color:var(--ink);line-height:1.2;letter-spacing:-.01em}
.wrap{max-width:1200px;margin:0 auto;padding:0 22px}
.muted{color:var(--mut)}.muted2{color:#9C8D86}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--gold)}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor}

/* ---- Nút ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:11px 24px;border-radius:999px;border:1.5px solid var(--navy);background:var(--navy);color:#fff;font:600 15px var(--sans);text-decoration:none;cursor:pointer;transition:.2s;white-space:nowrap}
.btn:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(142,27,36,.25)}
.btn.gold{background:linear-gradient(135deg,var(--gold2),var(--gold));border-color:transparent;color:#1A1405}
.btn.ghost{background:transparent;color:var(--navy)}
.btn.light{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.35);color:#fff}
.btn.zalo{background:#0068FF;border-color:#0068FF}
.btn.sm{min-height:38px;padding:7px 16px;font-size:14px}.btn.block{width:100%}
.mini{font:600 13px var(--sans);padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--navy);cursor:pointer}
.mini.pri{background:var(--navy);color:#fff;border-color:var(--navy)}.mini.danger{color:var(--bad);border-color:#efc9c6}

/* ---- Thanh điều hướng ---- */
.nav,.appbar{position:sticky;top:0;z-index:50;background:rgba(94,15,23,.86);backdrop-filter:saturate(160%) blur(14px);-webkit-backdrop-filter:saturate(160%) blur(14px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav .wrap,.appbar .wrap{display:flex;align-items:center;gap:22px;min-height:70px}
.logo{display:flex;align-items:center;gap:11px;text-decoration:none;color:#fff;font-family:var(--serif);font-weight:700;font-size:20px;line-height:1.05}
.logo i{font-style:normal;display:grid;place-items:center;width:42px;height:42px;border-radius:13px;background:linear-gradient(140deg,var(--gold2),var(--gold));color:var(--ink);font-family:var(--serif);font-size:17px;box-shadow:0 6px 16px rgba(201,162,77,.35)}
.logo small{display:block;font:500 11.5px var(--sans);letter-spacing:.14em;text-transform:uppercase;color:var(--gold2);margin-top:3px}
footer .logo{color:var(--ink)}
.nav .links{display:flex;gap:4px;margin-left:auto}
.nav .links a,.appbar nav a{color:#F3DFE1;text-decoration:none;font-size:14.5px;font-weight:500;padding:8px 12px;border-radius:999px;transition:.15s}
.nav .links a:hover,.appbar nav a:hover{color:#fff;background:rgba(255,255,255,.08)}
.nav .acts{display:flex;gap:8px}.nav .btn.ghost{color:#fff;border-color:rgba(255,255,255,.4)}
.appbar nav{display:flex;flex-wrap:wrap;gap:4px;margin-left:auto}.appbar nav a.on{background:rgba(201,162,77,.18);color:var(--gold2)}
.burger{display:none;margin-left:auto;width:44px;height:44px;border-radius:12px;border:1px solid rgba(255,255,255,.3);background:transparent;color:#fff;font-size:20px}
@media(max-width:980px){.nav .links,.nav .acts{display:none}.burger{display:block}
 .nav.open .wrap{flex-wrap:wrap;padding-bottom:14px}.nav.open .links,.nav.open .acts{display:flex;flex-direction:column;width:100%;margin:0}.nav.open .acts{flex-direction:row}
 .appbar .wrap{flex-wrap:wrap;padding:8px 22px}.appbar nav{margin:0;width:100%}}

/* ---- Hero ---- */
.hero{position:relative;overflow:hidden;color:#fff;background:radial-gradient(900px 500px at 85% 0%,rgba(201,162,77,.28),transparent 60%),radial-gradient(700px 500px at 0% 100%,rgba(142,27,36,.55),transparent 60%),linear-gradient(160deg,#2A060B,#4A0C14 45%,#6B0F1A);padding:90px 0 110px}
.hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:56px 56px;mask-image:radial-gradient(ellipse at 60% 40%,#000 30%,transparent 75%);pointer-events:none}
.hero .wrap{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.hero h1{color:#fff;font-size:clamp(36px,5.2vw,62px);margin:18px 0 18px;font-weight:700}
.hero h1 em{font-style:italic;background:linear-gradient(120deg,var(--gold2),var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{font-size:18.5px;color:#F1DADC;max-width:600px;margin:0 0 30px;font-weight:300}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px}
.hero .chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:34px}
.hero .chips span{font-size:13.5px;color:#F6E6E8;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.05);padding:6px 14px;border-radius:999px}
.mock{position:relative;background:linear-gradient(180deg,rgba(255,255,255,.1),rgba(255,255,255,.04));border:1px solid rgba(255,255,255,.16);border-radius:26px;padding:22px;box-shadow:var(--shadow2);backdrop-filter:blur(10px)}
.mock .bar{display:flex;gap:6px;margin-bottom:16px}.mock .bar i{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.25)}
.mock .row{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 14px;border-radius:14px;background:rgba(255,255,255,.06);margin-bottom:10px;font-size:14.5px;color:#e7ecf6}
.mock .row b{color:#fff;font-weight:600}.mock .ok{color:#7BE0A8;font-weight:600;font-size:13px}
.mock .meter{height:8px;border-radius:99px;background:rgba(255,255,255,.12);overflow:hidden;margin-top:8px}.mock .meter i{display:block;height:100%;background:linear-gradient(90deg,var(--gold2),var(--gold))}
.mock .float{position:absolute;right:-18px;bottom:-26px;background:#fff;color:var(--ink);border-radius:18px;padding:14px 18px;box-shadow:var(--shadow2);display:flex;gap:12px;align-items:center}
.mock .float .av{width:46px;height:46px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(140deg,var(--navy),var(--navy2));color:var(--gold2);font-family:var(--serif);font-weight:700}
.mock .float small{display:block;color:var(--mut);font-size:12px}
@media(max-width:980px){.hero{padding:60px 0 90px}.hero .wrap{grid-template-columns:1fr}.mock .float{right:10px}}

/* ---- Khối nội dung ---- */
.sec{padding:96px 0}.sec.alt{background:#fff}.sec.dark{background:linear-gradient(160deg,#4A0C14,#6B0F1A);color:#F6E6E8}
.sec.dark h2,.sec.dark h3{color:#fff}
.sec-h{max-width:760px;margin:0 auto 52px;text-align:center}.sec-h h2{font-size:clamp(30px,3.8vw,44px);margin:12px 0 14px}.sec-h p{color:var(--mut);font-size:17px;margin:0}
.sec.dark .sec-h p{color:#E8C9CC}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:-60px;position:relative;z-index:2}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px;text-align:center;box-shadow:var(--shadow)}
.stat b{display:block;font-family:var(--serif);font-size:36px;color:var(--navy)}.stat span{color:var(--mut);font-size:14px}
@media(max-width:760px){.stats{grid-template-columns:repeat(2,1fr)}}
.vals{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.val{padding:28px;border-radius:var(--r);background:var(--ivory);border:1px solid var(--line)}
.val .ic{font-size:30px}.val h3{font-size:22px;margin:12px 0 8px}.val p{margin:0;color:var(--mut)}
.feats{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feat{position:relative;padding:30px;border-radius:22px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);transition:.25s;overflow:hidden}
.feat::before{content:"";position:absolute;inset:0 0 auto;height:4px;background:linear-gradient(90deg,var(--navy),var(--gold))}
.feat:hover{transform:translateY(-4px);box-shadow:var(--shadow2)}
.feat .ic{width:54px;height:54px;border-radius:16px;display:grid;place-items:center;font-size:26px;background:var(--gold-soft);border:1px solid #F0E2BC}
.feat h3{font-size:21px;margin:18px 0 8px}.feat p{margin:0 0 12px;color:var(--mut)}
.feat ul{margin:0;padding-left:18px;color:var(--txt);font-size:14.5px}.feat li{margin:3px 0}
.feat .num{position:absolute;right:22px;top:18px;font-family:var(--serif);font-size:44px;color:#F1EBDD;font-weight:800}
@media(max-width:980px){.vals,.feats{grid-template-columns:1fr 1fr}}@media(max-width:640px){.vals,.feats{grid-template-columns:1fr}}
.integ{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:34px}
.integ span{padding:9px 18px;border-radius:999px;background:#fff;border:1px solid var(--line);font-weight:500;font-size:14.5px;box-shadow:0 2px 8px rgba(0,0,0,.03)}
.showcase{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.showcase h2{font-size:clamp(28px,3.4vw,40px);margin:12px 0}.showcase ul{padding-left:0;list-style:none}.showcase li{padding:8px 0 8px 34px;position:relative}
.showcase li::before{content:"✓";position:absolute;left:0;top:8px;width:22px;height:22px;border-radius:50%;background:var(--gold);color:var(--ink);display:grid;place-items:center;font-size:13px;font-weight:700}
.struct{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:24px;padding:26px}
.struct .seg{display:flex;height:58px;border-radius:14px;overflow:hidden;margin:10px 0 22px;font-weight:600;font-size:14px}
.struct .seg div{display:grid;place-items:center;color:#4A0C14}
.struct .lbl{display:flex;justify-content:space-between;font-size:13.5px;color:#E8C9CC}
@media(max-width:900px){.showcase{grid-template-columns:1fr}}
.steps3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;counter-reset:s}
.step{padding:30px;border-radius:22px;background:#fff;border:1px solid var(--line);position:relative}
.step::before{counter-increment:s;content:"0" counter(s);font-family:var(--serif);font-size:48px;font-weight:800;background:linear-gradient(135deg,var(--gold2),var(--gold));-webkit-background-clip:text;background-clip:text;color:transparent}
.step h3{font-size:21px;margin:6px 0 8px}.step p{margin:0;color:var(--mut)}
@media(max-width:860px){.steps3{grid-template-columns:1fr}}
.prices{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;align-items:stretch}
.price{position:relative;display:flex;flex-direction:column;padding:26px 20px;border-radius:22px;background:#fff;border:1px solid var(--line);text-align:center}
.price h3{font-size:19px;margin:0 0 10px;color:var(--ink)}.price .amt{font-family:var(--serif);font-size:32px;color:var(--navy);font-weight:700}
.price .per{color:var(--mut);font-size:13.5px;margin-bottom:18px}.price .btn{margin-top:auto}
.price.hot{background:#fff;border:1.5px solid var(--navy);transform:translateY(-6px);box-shadow:0 16px 40px rgba(142,27,36,.14)}
.price.hot .btn{background:var(--navy);border-color:var(--navy);color:#fff}
.price .ribbon{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,var(--gold2),var(--gold));color:var(--ink);font-size:12px;font-weight:700;padding:4px 14px;border-radius:999px;letter-spacing:.06em;text-transform:uppercase}
@media(max-width:1060px){.prices{grid-template-columns:repeat(3,1fr)}}@media(max-width:640px){.prices{grid-template-columns:1fr 1fr}.price.hot{transform:none}}
.addon{margin-top:26px;display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;padding:24px 28px;border-radius:22px;background:var(--gold-soft);border:1px solid #EEDDB0}
.addon h3{margin:0;font-size:21px}
.people{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.person{padding:28px;border-radius:22px;background:#fff;border:1px solid var(--line);text-align:center}
.person .av{width:84px;height:84px;margin:0 auto 14px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(140deg,var(--navy),var(--navy2));color:var(--gold2);font-family:var(--serif);font-size:28px;font-weight:700;box-shadow:0 0 0 6px var(--gold-soft)}
.person small{display:block;color:var(--gold);font-weight:600;letter-spacing:.08em;text-transform:uppercase;font-size:12px}
.person h3{margin:6px 0 4px;font-size:21px}
@media(max-width:860px){.people{grid-template-columns:1fr}}
.faq{max-width:860px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:4px 22px;margin-bottom:12px}
.faq summary{cursor:pointer;font-weight:600;padding:16px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::after{content:"+";font-size:22px;color:var(--gold);line-height:1}.faq details[open] summary::after{content:"–"}
.faq details p{margin:0 0 16px;color:var(--mut)}
.cta-band{border-radius:30px;padding:56px;text-align:center;color:#fff;background:radial-gradient(600px 300px at 80% 0%,rgba(201,162,77,.35),transparent 60%),linear-gradient(140deg,#5E0F17,#8E1B24)}
.cta-band h2{color:#fff;font-size:clamp(28px,3.6vw,42px);margin:0 0 12px}.cta-band p{color:#F1DADC;margin:0 0 26px}

/* ---- Footer ---- */
footer.site{background:#fff;border-top:1px solid var(--line);padding:48px 0 60px;font-size:14.5px;color:var(--mut)}
footer.site .wrap{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:28px}footer.site b{color:var(--ink)}
@media(max-width:800px){footer.site .wrap{grid-template-columns:1fr}}
.zalo-fab{position:fixed;right:18px;bottom:18px;z-index:40;background:#0068FF;color:#fff;text-decoration:none;font-weight:600;font-size:14px;padding:12px 18px;border-radius:999px;box-shadow:0 10px 24px rgba(0,104,255,.35)}

/* ---- Form xác thực ---- */
.auth{min-height:calc(100vh - 70px);display:grid;place-items:center;padding:56px 18px;background:radial-gradient(700px 400px at 100% 0%,rgba(201,162,77,.16),transparent 60%),radial-gradient(600px 400px at 0% 100%,rgba(142,27,36,.12),transparent 60%),var(--ivory)}
.auth-card{width:100%;max-width:470px;background:#fff;border:1px solid var(--line);border-radius:26px;padding:38px;box-shadow:var(--shadow2)}
.auth-card.wide{max-width:780px}.auth-card h1{font-size:32px;margin:0 0 6px}.auth-card .sub{color:var(--mut);margin:0 0 22px}
.fg{margin-bottom:16px}.fg label{display:block;font-weight:600;font-size:14px;margin-bottom:6px;color:var(--ink)}
input[type=text],input[type=email],input[type=tel],input[type=password],input[type=search],input[type=number],select,textarea{width:100%;min-height:46px;padding:10px 14px;border:1.5px solid var(--line);border-radius:12px;font:15px var(--sans);background:#fff;color:var(--txt);transition:.15s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 4px rgba(201,162,77,.18)}
.hint{display:block;font-size:13px;color:var(--mut);margin-top:5px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}@media(max-width:600px){.row2{grid-template-columns:1fr}.auth-card{padding:26px}}
.planpick{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin-bottom:12px}
.planpick label{position:relative;display:flex;flex-direction:column;gap:2px;padding:14px;border:1.5px solid var(--line);border-radius:14px;cursor:pointer;font-weight:400;margin:0}
.planpick input{position:absolute;opacity:0}.planpick b{font-size:15px;color:var(--ink)}.planpick span{font-size:13.5px;color:var(--mut)}
.planpick label:has(input:checked){border-color:var(--gold);background:var(--gold-soft);box-shadow:0 0 0 3px rgba(201,162,77,.18)}
.check{display:flex;gap:12px;align-items:flex-start;padding:14px 16px;border-radius:14px;background:var(--gold-soft);border:1px solid #EEDDB0;margin-bottom:14px;font-size:14.5px;cursor:pointer}
.check input{width:20px;height:20px;margin-top:2px;accent-color:var(--navy);flex:none}
.links-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;margin-top:16px;font-size:14px}
.alert{padding:12px 16px;border-radius:14px;margin:0 0 14px;font-size:14.5px;border:1px solid}
.alert.ok{background:#EAF7F0;border-color:#BFE6CF;color:#145C3A}.alert.warn{background:#FFF6E2;border-color:#F1D9A2;color:#7A5200}
.alert.err,.alert.bad{background:#FDECEA;border-color:#F3C3BE;color:#8C1D16}

/* ---- Trang trong ---- */
.page{padding:36px 0 70px}
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:20px 0}
.kpi{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px 20px;box-shadow:var(--shadow)}
.kpi small{display:block;color:var(--mut);font-size:13px;margin-bottom:6px}.kpi b{font-family:var(--serif);font-size:26px;color:var(--ink)}
.kpi.hl{background:linear-gradient(150deg,#5E0F17,#8E1B24);border-color:transparent}.kpi.hl small{color:#E8C9CC}.kpi.hl b{color:#fff}
@media(max-width:860px){.kpis{grid-template-columns:1fr 1fr}}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}@media(max-width:860px){.grid2{grid-template-columns:1fr}}
.panel{background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px;margin-bottom:18px;box-shadow:var(--shadow)}
.tag{display:inline-block;font:600 12px var(--sans);padding:3px 10px;border-radius:999px;border:1px solid}
.tag.ok{background:#EAF7F0;border-color:#BFE6CF;color:var(--ok)}.tag.warn{background:#FFF6E2;border-color:#F1D9A2;color:var(--warn)}
.tag.bad{background:#FDECEA;border-color:#F3C3BE;color:var(--bad)}.tag.soon{background:#F1F2F6;border-color:#DDE0E8;color:var(--mut)}.tag.role{background:#FBEFF0;border-color:#F0CCD1;color:var(--navy2)}
.tw{overflow-x:auto}table.t{width:100%;border-collapse:collapse;font-size:14px}
table.t th{text-align:left;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--mut);background:var(--ivory);padding:10px 12px;border-bottom:1px solid var(--line)}
table.t td{padding:12px;border-bottom:1px solid var(--line);vertical-align:top}table.t .num{text-align:right;white-space:nowrap}
table.t tfoot td{font-weight:700;background:var(--ivory)}
.acts-cell{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.acts-cell form{display:flex;flex-wrap:wrap;gap:6px}
.tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:18px;border-bottom:1px solid var(--line)}
.tabs a{padding:10px 16px;text-decoration:none;color:var(--mut);font-weight:600;border-bottom:3px solid transparent;margin-bottom:-1px}
.tabs a.on{color:var(--navy);border-bottom-color:var(--gold)}.tabs .n{background:var(--bad);color:#fff;border-radius:999px;padding:1px 8px;font-size:12px;margin-left:6px}
.filters{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:14px}.filters input{flex:1 1 260px}.filters select{width:auto}

/* ---- Bảng điều khiển trợ lý ---- */
.welcome{border-radius:28px;padding:36px;color:#fff;background:radial-gradient(600px 300px at 90% 0%,rgba(201,162,77,.32),transparent 60%),linear-gradient(140deg,#5E0F17,#8E1B24);display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between}
.welcome h1{color:#fff;font-size:clamp(28px,3.6vw,40px);margin:8px 0}.welcome p{color:#F1DADC;margin:0}
.mods{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px;margin-top:24px}
.mod{display:flex;flex-direction:column;gap:6px;padding:24px;border-radius:20px;background:#fff;border:1px solid var(--line);text-decoration:none;color:var(--txt);box-shadow:var(--shadow);transition:.2s}
.mod:hover{transform:translateY(-3px);border-color:var(--gold)}.mod .ic{font-size:28px}.mod b{font-family:var(--serif);font-size:19px;color:var(--ink)}.mod span{color:var(--mut);font-size:14px}
.mod.lock{opacity:.6}
.viewer{display:flex;flex-direction:column;height:100dvh}
.vbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:10px 16px;background:#4A0C14;color:#fff}
.vbar b{font-weight:600}.vbar .btn.ghost{color:#fff;border-color:rgba(255,255,255,.35)}
.viewer iframe{flex:1;width:100%;border:0;background:#fff}
.reveal{opacity:0;transform:translateY(18px);transition:.7s ease}.reveal.in{opacity:1;transform:none}
.bankbox{margin-top:22px;padding:18px 22px;border-radius:18px;background:#FFFBEF;border:1.5px dashed #E2C77A;font-size:15.5px;line-height:1.8}
#phi-tham-gia .sec-h h2{text-transform:uppercase;color:var(--ink)}