@font-face{font-family:"Playfair";src:url(/assets/fonts/PlayfairDisplay-VF.ttf);font-weight:400 900;font-display:swap}
@font-face{font-family:"BVP";src:url(/assets/fonts/BeVietnamPro-Medium.ttf);font-weight:400 500;font-display:swap}
@font-face{font-family:"BVP";src:url(/assets/fonts/BeVietnamPro-Bold.ttf);font-weight:600 700;font-display:swap}
@font-face{font-family:"BVP";src:url(/assets/fonts/BeVietnamPro-ExtraBold.ttf);font-weight:800;font-display:swap}
:root{--bg:#f6f0e3;--paper:#fffdf8;--ink:#191714;--mut:#6a6356;--line:#e4dac4;--red:#c8102e;--navy:#14213d;--navy2:#22345f;--gold:#d8b25a;--gold2:#b58a2c;--ok:#1b7a43;--bad:#b3261e;--fs:19px;--sh:0 10px 30px rgba(20,33,61,.12)}
@media(prefers-color-scheme:dark){:root{--bg:#0f1220;--paper:#181c30;--ink:#f3eee2;--mut:#b2ab9a;--line:#2d3350;--sh:0 10px 30px rgba(0,0,0,.4)}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:500 var(--fs)/1.6 "BVP",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:"Playfair",Georgia,serif;line-height:1.15;margin:0}
button{font:inherit;font-weight:600;cursor:pointer;border:1.5px solid var(--line);background:var(--paper);color:var(--ink);border-radius:999px;padding:10px 20px;min-height:46px;transition:.18s}
button:hover{transform:translateY(-1px);box-shadow:var(--sh)}button:focus-visible,input:focus-visible,a:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
button.pri{background:var(--red);border-color:var(--red);color:#fff}
button.navy{background:var(--navy);border-color:var(--navy);color:#fff}
button[aria-pressed=true]{background:var(--navy);color:#fff;border-color:var(--navy)}
button:disabled{opacity:.4;pointer-events:none}
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:10px;padding:10px 18px;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top img{height:40px}.top .nm{font-weight:800;flex:1;min-width:0;font-size:.95em;letter-spacing:.2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}@media(max-width:560px){.top .nm{display:none}.top{justify-content:space-between}}.top button{padding:6px 14px;min-height:44px}
.wrap{max-width:1120px;margin:0 auto;padding:0 18px}
.hero{background:linear-gradient(135deg,var(--navy),var(--navy2));color:#f7f1e3;border-radius:0 0 40px 40px;padding:56px 0 64px;position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;background:radial-gradient(var(--gold) 0,transparent 65%);opacity:.22}
.hero .wrap{display:grid;gap:28px;grid-template-columns:1fr;align-items:center;position:relative}
@media(min-width:860px){.hero .wrap{grid-template-columns:1.1fr .9fr}}
.kick{color:var(--gold);font-weight:700;letter-spacing:.14em;text-transform:uppercase;font-size:.62em}
.hero h1{font-size:clamp(2rem,5.2vw,3.6rem);margin:.3em 0}.hero h1 em{color:var(--gold);font-style:normal}
.hero p{max-width:34em;opacity:.9}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.hero .cta button:not(.pri){background:transparent;color:#f7f1e3;border-color:rgba(255,255,255,.35)}
.hero .art svg{width:100%;height:auto;border-radius:24px;box-shadow:0 20px 50px rgba(0,0,0,.35)}
.chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}.chip{border:1px solid rgba(255,255,255,.25);border-radius:999px;padding:4px 14px;font-size:.66em}
section{padding:40px 0}
.sec-h{display:flex;justify-content:space-between;align-items:end;gap:14px;flex-wrap:wrap;margin-bottom:20px}.sec-h h2{font-size:clamp(1.5rem,3.6vw,2.3rem)}
.seg{display:flex;gap:8px;flex-wrap:wrap}
.grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.lc{background:var(--paper);border:1px solid var(--line);border-radius:26px;overflow:hidden;box-shadow:var(--sh);display:flex;flex-direction:column;transition:.2s}
.lc:hover{transform:translateY(-4px)}
.lc .im svg{display:block;width:100%;height:auto}
.lc .bd{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1}
.lc h3{font-size:1.35rem}.meta{font-size:.68em;color:var(--mut);display:flex;gap:8px;flex-wrap:wrap}
.lc ul{margin:0;padding-left:1.1em;font-size:.86em}.lc .go{margin-top:auto;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.badge{font-size:.66em;font-weight:700;border-radius:999px;padding:2px 12px;background:rgba(27,122,67,.14);color:var(--ok)}
.fam{background:linear-gradient(120deg,rgba(216,178,90,.22),transparent);border-left:4px solid var(--gold);padding:10px 14px;border-radius:12px;font-size:.82em}
.ask{background:var(--paper);border:1px solid var(--line);border-radius:26px;padding:24px;box-shadow:var(--sh)}
input[type=text]{font:inherit;padding:12px 18px;border:1.5px solid var(--line);border-radius:999px;width:100%;background:var(--bg);color:var(--ink)}
.res button{margin:6px 6px 0 0}
.cl{background:var(--paper);border:1px dashed var(--gold2);border-radius:22px;padding:18px;display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.cl .pl{width:58px;height:58px;border-radius:50%;background:var(--red);color:#fff;display:grid;place-items:center;font-size:1.4em;flex:none}
.foot{padding:30px 0 60px;color:var(--mut);font-size:.72em;border-top:1px solid var(--line)}
/* lớp học */
.room{padding:18px 0 60px}
.stage{position:relative;border-radius:28px;overflow:hidden;box-shadow:var(--sh);background:var(--navy)}
.stage .scene svg{display:block;width:100%;height:auto;max-height:62vh}
.stage .scene{animation:fade .6s}
@keyframes fade{from{opacity:0;transform:scale(1.02)}to{opacity:1;transform:none}}
.sub{padding:18px 22px;background:#0b1020;color:#fff;border-top:2px solid var(--gold)}
.sub b{color:var(--gold)}.sub .t{font-size:1.1em;line-height:1.55;min-height:3.1em}
.who{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 12px}
.av{background:var(--navy);color:#fff;border-radius:999px;padding:4px 12px 4px 6px;font-size:.66em;display:flex;align-items:center;gap:6px;opacity:.55;transition:.25s}
.av i{font-style:normal;font-size:1.5em}.av.on{opacity:1;background:var(--red);transform:scale(1.07)}
.tl{display:flex;gap:6px;margin:16px 0}.tl button{flex:1;padding:0;height:8px;min-height:0;border-radius:6px;border:0;background:var(--line)}.tl button.d{background:var(--gold)}.tl button.c{background:var(--red)}
.ctl{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.two{display:grid;gap:20px;grid-template-columns:1fr;margin-top:20px}@media(min-width:860px){.two{grid-template-columns:1.2fr 1fr}}
.card{background:var(--paper);border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--sh)}
.card h3{font-size:1.3rem;margin-bottom:10px}
.pts{list-style:none;margin:0;padding:0}.pts li{display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-bottom:1px solid var(--line);animation:fade .5s both}
.pts li:before{content:"";flex:none;width:12px;height:12px;border-radius:50%;background:var(--red);margin-top:.5em}
.chk label{display:flex;gap:12px;align-items:flex-start;padding:12px;border-radius:14px;cursor:pointer}.chk label:hover{background:var(--bg)}.chk input{width:26px;height:26px;accent-color:var(--ok);flex:none}
.qopt{display:block;width:100%;text-align:left;margin:10px 0;border-radius:18px;padding:14px 18px}
.qopt.ok{border-color:var(--ok);background:rgba(27,122,67,.14)}.qopt.bad{border-color:var(--bad);background:rgba(179,38,30,.12)}
.gt{margin:8px 0 14px;color:var(--mut)}
.score{font:800 4rem "Playfair";color:var(--red)}
.modal{position:fixed;inset:0;background:rgba(5,8,18,.82);display:none;place-items:center;z-index:50;padding:18px}.modal.on{display:grid}
.modal .box{width:min(900px,100%);background:#000;border-radius:18px;overflow:hidden}.modal iframe,.modal video{width:100%;aspect-ratio:16/9;border:0;display:block}
.modal .bar{padding:10px 14px;display:flex;justify-content:space-between;gap:10px;background:var(--paper);align-items:center}
/* hoạt hoạ SVG */
.shake{animation:sk 1.1s infinite}@keyframes sk{0%,100%{transform:rotate(0)}20%{transform:rotate(-4deg)}40%{transform:rotate(4deg)}60%{transform:rotate(-3deg)}}
.pulse{animation:pu 1.6s infinite}@keyframes pu{50%{transform:scale(1.08)}}
.pop{animation:po 1.8s infinite}@keyframes po{50%{transform:scale(1.07)}}
.float{animation:fl 3s ease-in-out infinite}@keyframes fl{50%{transform:translateY(-8px)}}
.slide-x{animation:sx 2.4s ease-in-out infinite alternate}@keyframes sx{to{transform:translateX(-90px)}}
@media(prefers-reduced-motion:reduce){*{animation:none!important}}
.gd{position:fixed;inset:0;z-index:90;background:rgba(8,12,28,.55);display:flex;align-items:center;justify-content:center;padding:16px}
.gb{background:#fff;color:#16203f;max-width:520px;width:100%;border-radius:20px;padding:22px 24px;box-shadow:0 20px 60px rgba(0,0,0,.35);font-size:max(16px,calc(var(--fs,19px)*.9))}
.gb h3{margin:0 0 8px}.gb p{margin:8px 0;line-height:1.6}.gb .meta{color:#55607a;font-size:.88em}.gb .ok{color:#15803d;font-weight:600}.gb .warn{color:#b45309}
.gb .bar{height:10px;border-radius:99px;background:#e2e8f0;overflow:hidden;margin:12px 0 4px}.gb .bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,#e31e24,#ff6d00);transition:width .2s}
.gbt{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap;margin-top:14px}.gbt button{min-height:44px;padding:0 18px;border-radius:12px;font:inherit;font-weight:700;cursor:pointer;border:1.5px solid #d5dce8;background:#fff;color:#16203f}
.gbt button.pri{background:#e31e24;border-color:#e31e24;color:#fff}.gbt button:disabled{opacity:.6}

.top .home{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:999px;border:1.5px solid var(--line);background:var(--paper);color:var(--ink);text-decoration:none;font-weight:800;font-size:1.15em;flex:none}
.top .home:hover{border-color:var(--ink)}
.top{flex-wrap:wrap}
.hero .art{overflow:hidden;border-radius:24px}