:root{
  --ink:#172231; --ink2:#2A3646; --muted:#4A5565; --line:#DADDE2; --line2:#E6E8EC;
  --bg:#F3F4F1; --card:#FFFFFF; --navy:#13233A; --navy-line:#3E5371; --navy-sub:#B9C6D8; --navy-text:#D3DCE8;
  --cta:#E06A2E; --cta-ink:#1A0A02; --link:#A8401A; --link-h:#7E2F12;
  --xanh-bg:#E3ECF8; --xanh-fg:#163E73; --cam-bg:#FAE6D6; --cam-fg:#7E310D;
  --luc-bg:#DDEFE5; --luc-fg:#1A553B; --tim-bg:#ECE4F5; --tim-fg:#4B2A78; --xam-bg:#E8EAEE; --xam-fg:#2A3646;
  --r:8px; --font:'Be Vietnam Pro',system-ui,-apple-system,'Segoe UI',sans-serif; --mono:'JetBrains Mono',ui-monospace,Consolas,monospace;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.5}
a{color:var(--link)}a:hover{color:var(--link-h)}
:focus-visible{outline:3px solid #3B82C4;outline-offset:2px}
h1,h2,h3,h4{margin:0}
.wrap{max-width:1240px;margin:0 auto;padding-left:24px;padding-right:24px}
.muted{color:var(--muted);margin:0}
.small{font-size:14px}
.muted-inv{color:var(--navy-text)}
.prewrap{white-space:pre-line;margin:0;color:var(--muted)}
.skip{position:absolute;left:-999px;top:0;background:#fff;padding:8px 12px;z-index:10}.skip:focus{left:8px}
.notice{background:#FFF4D6;color:#5A4200;font-size:14px;text-align:center;padding:8px 16px}

.top{background:#fff;border-bottom:1px solid var(--line)}
.top-in{display:flex;flex-wrap:wrap;align-items:center;gap:8px 32px;padding-top:12px;padding-bottom:12px}
.brand{display:flex;align-items:baseline;gap:8px;text-decoration:none;color:var(--ink)}
.brand b{font-size:22px;letter-spacing:-.02em}.brand span{font-weight:500;font-size:15px;color:var(--muted)}
.nav{display:flex;flex-wrap:wrap;gap:0 22px;font-size:15px}
.nav a{color:var(--ink2);text-decoration:none;padding:10px 0;display:inline-block}.nav a:hover{color:var(--ink)}

.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;border-radius:var(--r);font:inherit;font-size:15px;font-weight:500;cursor:pointer;text-decoration:none;border:1px solid transparent}
.btn.ghost{background:#fff;border-color:#C5CAD2;color:var(--ink)}.btn.ghost.strong{font-weight:600}
.btn.primary{background:var(--cta);color:var(--cta-ink);font-weight:700;min-height:48px;padding:0 24px}
.btn.dark{background:var(--ink);color:#fff;font-weight:600}
.btn.outline-inv{border-color:#5A6E8B;color:#fff;background:transparent}
.btn[disabled]{opacity:.6;cursor:progress}
.btn-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}

/* hero */
.hero{background:var(--navy);color:#fff}
.hero .wrap{padding-top:36px;padding-bottom:20px}
.hero-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}
.hero-eyebrow{margin:0;font-size:14px;color:var(--navy-sub)}
.hero-ctl{display:flex;gap:8px}
.icon-btn{width:44px;height:44px;border-radius:var(--r);border:1px solid var(--navy-line);background:transparent;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center}
.icon-btn:hover{background:#1C3150}
.slide{display:flex;flex-wrap:wrap;gap:28px 48px;align-items:stretch;min-height:250px}
.slide-main{flex:999 1 520px;min-width:0;display:flex;flex-direction:column;gap:14px}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{font-size:13px;font-weight:600;padding:5px 10px;border-radius:999px;background:#F2B48F;color:#3B1607}
.tag.line{background:transparent;border:1px solid var(--navy-line);color:var(--navy-text);font-weight:500}
.slide h1{font-size:clamp(26px,3.2vw,38px);line-height:1.2;letter-spacing:-.015em;max-width:760px}
.slide p{margin:0}
.slide .desc{font-size:17px;line-height:1.6;color:var(--navy-text);max-width:680px}
.slide .when{font-size:15px;color:var(--navy-sub)}
.datebox{flex:1 1 220px;max-width:320px;border:1px solid var(--navy-line);border-radius:14px;padding:22px 26px;display:flex;flex-direction:column;justify-content:center;gap:4px}
.datebox .wd{font-size:15px;color:var(--navy-sub)}
.datebox .d{font-size:88px;line-height:1;font-weight:700;letter-spacing:-.04em}
.datebox .m{font-size:19px;font-weight:500}
.dots{display:flex;gap:4px;margin-top:20px}
.dot{width:44px;height:44px;padding:0;border:0;background:transparent;cursor:pointer;display:flex;align-items:center;justify-content:center}
.dot span{display:block;height:4px;width:32px;border-radius:2px;background:var(--navy-line)}
.dot[aria-current="true"] span{background:#F2B48F}

/* sections */
.sec{padding-top:40px;padding-bottom:8px}
.sec h2{font-size:28px;font-weight:700;letter-spacing:-.01em;margin-bottom:6px}
.sec-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:16px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.chip{min-height:40px;padding:0 14px;border-radius:999px;border:1px solid #C5CAD2;background:#fff;color:var(--ink);font:inherit;font-size:14px;font-weight:500;cursor:pointer}
.chip[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:#fff}

/* schedule grid */
.sched-box{background:#fff;border:1px solid var(--line);border-radius:12px;overflow-x:auto}
.sched{min-width:1000px;display:grid;grid-template-columns:96px repeat(7,minmax(0,1fr))}
.sh{padding:10px 12px;border-bottom:1px solid var(--line);border-left:1px solid var(--line2)}
.sh:first-child{border-left:0;font-size:13px;color:var(--muted)}
.sh b{display:block;font-size:14px}.sh span{font-size:13px;color:var(--muted)}
.sh.today{background:var(--ink);color:#fff}.sh.today span{color:var(--navy-text)}
.sr{padding:12px;border-bottom:1px solid var(--line2)}
.sr b{display:block;font-size:14px}.sr span{font-size:12px;color:var(--muted)}
.sc{padding:8px;border-bottom:1px solid var(--line2);border-left:1px solid var(--line2);min-height:96px;display:flex;flex-direction:column;gap:6px}
.sc.today{background:#F6F7FA}
.cls{border-radius:var(--r);padding:8px 10px;display:flex;flex-direction:column;gap:2px;font-size:12px}
.cls .code{font-family:var(--mono);font-weight:500}
.cls .nm{font-size:13px;font-weight:600;line-height:1.35}
.sched-empty{margin:0;padding:14px 16px;border-top:1px solid var(--line2);color:var(--muted);font-size:14px}
.agenda{display:none}
.c-xanh{background:var(--xanh-bg);color:var(--xanh-fg)}.c-cam{background:var(--cam-bg);color:var(--cam-fg)}
.c-luc{background:var(--luc-bg);color:var(--luc-fg)}.c-tim{background:var(--tim-bg);color:var(--tim-fg)}.c-xam{background:var(--xam-bg);color:var(--xam-fg)}
.t-xanh{color:var(--xanh-fg)}.t-cam{color:var(--cam-fg)}.t-luc{color:var(--luc-fg)}.t-tim{color:var(--tim-fg)}.t-xam{color:var(--xam-fg)}

@media (max-width:760px){
  .sched-box{display:none}
  .agenda{display:flex;flex-direction:column;gap:10px}
  .ag-day{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 14px;display:flex;flex-direction:column;gap:8px}
  .ag-day.today{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}
  .ag-day h3{font-size:15px}
  .ag-day h3 small{font-weight:400;color:var(--muted)}
  .ag-none{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;color:var(--muted);font-size:14px;margin:0}
}

/* join */
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:28px}
.join{display:flex;flex-direction:column;gap:20px}
.join h2{font-size:24px}
.tiles{display:flex;flex-wrap:wrap;gap:12px}
.tile{flex:1 1 260px;min-height:96px;text-align:left;padding:18px 20px;border-radius:12px;border:1px solid #C5CAD2;background:#fff;color:var(--ink);font:inherit;cursor:pointer;display:flex;flex-direction:column;gap:6px}
.tile b{font-size:18px}.tile span{font-size:14px;color:var(--muted)}
.tile.primary{background:#FCE3D3;border-color:#E9B999}
.tile[aria-expanded="true"]{background:var(--ink);border-color:var(--ink);color:#fff}.tile[aria-expanded="true"] span{color:var(--navy-text)}
.panel{border-top:1px solid var(--line2);padding-top:22px}
.panel h3{font-size:18px;margin:0 0 4px}
form{display:flex;flex-direction:column;gap:16px}
.fields{display:flex;flex-wrap:wrap;gap:16px}
.fields label{flex:1 1 280px;display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:500}
.fields label.wide{flex:999 1 420px}
input,select,textarea{font:inherit;font-size:15px;color:var(--ink);background:#fff;border:1px solid #A9B1BC;border-radius:var(--r);padding:10px 12px;min-height:44px;width:100%}
textarea{resize:vertical;min-height:88px}
.hint{font-size:12px;font-weight:400;color:var(--muted)}
.hp{position:absolute!important;left:-5000px!important;width:1px;height:1px;opacity:0}
.groups{display:flex;flex-wrap:wrap;gap:16px}
fieldset{flex:1 1 320px;min-width:0;margin:0;border:1px solid #E1E4E8;border-radius:12px;padding:12px 16px;display:flex;flex-direction:column;gap:2px}
legend{padding:0 6px;font-size:14px;font-weight:700}
.opt{display:flex;align-items:flex-start;gap:10px;min-height:44px;padding:6px 0;font-size:14px;cursor:pointer}
.opt input{width:18px;height:18px;min-height:0;margin:2px 0 0;padding:0;accent-color:var(--ink);flex:none}
.opt .code{font-family:var(--mono);font-size:12px}
.opt small{display:block;font-size:12px;color:var(--muted)}
.alert{margin:0;padding:10px 14px;border-radius:var(--r);background:#FBE4DA;color:#7A2A0B;font-size:14px}
.ok{margin:0;padding:10px 14px;border-radius:var(--r);background:var(--luc-bg);color:var(--luc-fg);font-size:14px}
.done{display:flex;flex-direction:column;gap:10px}
.done p{margin:0;color:var(--muted);line-height:1.6}
.split{display:flex;flex-wrap:wrap;gap:28px}
.contact{flex:1 1 260px;display:flex;flex-direction:column;gap:8px;font-size:15px}
.contact p{margin:0}
#fLh{flex:999 1 420px}

/* programs */
.programs{display:flex;flex-direction:column;gap:24px;margin-top:22px;padding-bottom:48px}
.prog{background:#fff;border:1px solid var(--line);border-radius:16px;padding:28px;display:flex;flex-direction:column;gap:20px}
.prog-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px}
.prog-head>div{flex:999 1 480px;min-width:0}
.pcode{display:inline-block;font-family:var(--mono);font-size:12px;font-weight:500;padding:4px 8px;border-radius:6px;margin-bottom:10px}
.prog h3{font-size:22px;margin-bottom:8px}
.prog-head p{margin:0;color:var(--muted);font-size:15px;line-height:1.6;max-width:760px}
.courses{display:flex;flex-wrap:wrap;gap:14px}
.course{flex:1 1 240px;min-width:0;border:1px solid #E1E4E8;border-radius:12px;padding:16px;display:flex;flex-direction:column;gap:8px;background:#FAFAF8}
.course .code{font-family:var(--mono);font-size:12px;font-weight:500}
.course h4{font-size:16px;font-weight:600;line-height:1.4}
.course p{margin:0;font-size:14px;color:var(--muted);flex-grow:1}
.course-meta{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.status{font-size:12px;font-weight:600;padding:4px 8px;border-radius:999px}
.s-open{background:#FCE3D3;color:#7E310D}.s-run{background:var(--luc-bg);color:var(--luc-fg)}.s-soon{background:var(--xam-bg);color:var(--xam-fg)}.s-req{background:var(--xanh-bg);color:var(--xanh-fg)}
.course .btn{min-height:40px;font-size:14px;align-self:flex-start;margin-top:4px}

.foot{border-top:1px solid var(--line);background:#fff}
.foot-in{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;padding-top:22px;padding-bottom:22px;font-size:14px;color:var(--muted)}

@media (max-width:760px){
  .hero .wrap{padding-top:22px;padding-bottom:10px}
  .hero-bar{margin-bottom:14px}
  .slide{min-height:0;gap:16px}
  .datebox{order:-1;max-width:none;flex:1 1 100%;flex-direction:row;align-items:baseline;flex-wrap:wrap;gap:4px 10px;padding:10px 14px;border-radius:10px}
  .datebox .d{font-size:34px}
  .datebox .m{font-size:16px}
  .dots{margin-top:10px}
  .sec{padding-top:28px}
  .sec h2{font-size:24px}
  .sec-head .btn-row{width:100%;flex-wrap:nowrap}
  .sec-head .btn-row .btn{flex:1 1 0;padding:0 6px;font-size:14px}
  .card,.prog{padding:18px}
}