/* Layout: CITARES program page — dark hero + meta strip, sticky anchor nav, content sections alternating white / soft blue, sidebar "at a glance" card */
:root{
  color-scheme:light;
  --blue:#0B4DB5; --blue-dark:#062E7A; --navy:#061A40; --sky:#1EA7E8; --ai:#5CC8FF;
  --ink:#0F1B2D; --muted:#5A6B82; --line:#E3E9F2; --bg:#FFFFFF; --soft:#F3F7FC; --on-dark:#D6E4FA; --on-dark-2:#9FB6DA;
  --radius:16px; --wrap:1200px;
  --font:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:140px}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
:where(img[width][height]){height:auto}
a{color:inherit;text-decoration:none}
:focus-visible{outline:3px solid var(--sky);outline-offset:3px;border-radius:6px}
.wrap{max-width:var(--wrap);margin:0 auto;padding-left:max(24px,env(safe-area-inset-left,0px));padding-right:max(24px,env(safe-area-inset-right,0px))}
section{padding-block:88px}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--blue)}
.eyebrow::before{content:"";display:inline-block;width:24px;height:2px;background:currentColor;vertical-align:middle;margin-right:10px}
h1,h2,h3{line-height:1.15;letter-spacing:-.01em;text-wrap:balance}
h2{font-size:clamp(28px,3.4vw,42px);font-weight:800;margin:14px 0 16px}
h3{font-size:19px;font-weight:700}
.lead{font-size:18px;color:var(--muted);max-width:720px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 26px;border-radius:999px;font-weight:700;font-size:15px;transition:.2s;border:2px solid transparent}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark)}
.btn-ghost{border-color:currentColor}
.btn-ghost:hover{background:rgba(255,255,255,.1)}
.btn-white{background:#fff;color:var(--blue)}

/* Header */
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:60;background:#fff}
header{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:rgba(255,255,255,.97);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px;gap:24px}
.nav .logo{flex:none;display:block;line-height:0}
.nav .logo img{width:136px;height:40px;max-width:none;flex:none}
.menu{display:flex;gap:28px;font-weight:600;font-size:15px}
.menu a{position:relative;padding:6px 0;color:#2A3A52}
.menu a:hover{color:var(--blue)}
.nav-right{display:flex;align-items:center;gap:16px}
.lang{font-weight:700;font-size:14px;color:var(--muted)}
.burger{display:none;background:none;border:0;font-size:26px;cursor:pointer;color:var(--ink)}

.menu a,.dd-btn,.nav-right .btn{white-space:nowrap}
@media (max-width:1180px) and (min-width:901px){
  .menu{gap:18px;font-size:14.5px}
  .dd-btn{font-size:14.5px}
  .nav-right .lang{display:none}
  .nav-right .btn{padding:10px 16px;font-size:14px}
}
/* Dropdown "Chương trình" */
.dd{position:relative;display:flex;align-items:center}
.dd-btn{display:inline-flex;align-items:center;gap:6px;background:none;border:0;font:inherit;font-weight:600;font-size:15px;color:#2A3A52;cursor:pointer;padding:6px 0}
.dd-btn:hover,.dd.open .dd-btn,.dd-btn.on{color:var(--blue)}
.dd-btn .car{width:7px;height:7px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-2px);transition:transform .2s}
.dd.open .dd-btn .car{transform:rotate(225deg) translateY(-2px)}
.dd-panel{position:absolute;top:100%;left:-20px;padding-top:14px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s;z-index:70}
.dd-inner{background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 18px 40px rgba(6,26,64,.14);padding:20px;min-width:320px}
.dd:hover .dd-panel,.dd.open .dd-panel{opacity:1;visibility:visible;transform:none}
.dd-group h6{font-size:12px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--blue);margin:0 0 10px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.dd-group a{display:block;padding:10px 12px;margin:0 -12px;border-radius:10px;color:var(--ink)}
.dd-group a:hover,.dd-group a.cur{background:var(--soft)}
.dd-group a b{display:block;font-size:15px;font-weight:700}
.dd-group a span{display:block;font-size:13px;color:var(--muted);font-weight:500}
.dd-group a.cur b{color:var(--blue)}

.brand{display:flex;align-items:center;gap:16px;min-width:0}
.brand img{height:38px;width:auto}
.brand .x{color:var(--muted);font-weight:600}
.brand .school{font-size:13px;font-weight:700;line-height:1.3;color:var(--blue-dark);text-transform:uppercase;letter-spacing:.02em}
.brand .school small{display:block;font-size:11px;font-weight:500;color:var(--muted);letter-spacing:.04em}
.nav .btn{padding:10px 20px;flex:none}

/* Hero */
.hero{position:relative;color:#fff;background:var(--navy);overflow:hidden;padding-block:96px 0}
.hero::before{content:"";position:absolute;inset:0;
  background:
    radial-gradient(circle at 82% 30%,rgba(92,200,255,.28),transparent 42%),
    linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px) 0 0/44px 44px,
    linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px) 0 0/44px 44px,
    linear-gradient(110deg,var(--navy) 0%,var(--blue-dark) 55%,var(--blue) 100%)}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.35fr 1fr;gap:48px;align-items:center}
.hero .eyebrow{color:#7FD3FF}
.hero h1{font-size:clamp(36px,5.6vw,68px);font-weight:800;text-transform:uppercase;margin:18px 0 18px}
.hero h1 em{font-style:italic;color:var(--ai)}
.tagline{font-size:20px;font-weight:700;color:#fff;margin-bottom:10px}
.hero p.sub{font-size:18px;max-width:600px;color:var(--on-dark);margin-bottom:32px}
.ctas{display:flex;gap:14px;flex-wrap:wrap}
.chip-ai{position:relative;justify-self:center;width:min(100%,360px);aspect-ratio:1;max-width:100%}
.chip-ai .core{position:absolute;inset:22%;border-radius:28px;background:linear-gradient(145deg,#1257C9,#0A3A8F);border:2px solid rgba(127,211,255,.6);display:grid;place-items:center;box-shadow:0 0 60px rgba(92,200,255,.35)}
.chip-ai .core b{font-size:clamp(56px,9vw,96px);font-weight:800;font-style:italic;letter-spacing:-.04em;background:linear-gradient(180deg,#fff,#7FD3FF);-webkit-background-clip:text;background-clip:text;color:transparent}
.chip-ai .pins{position:absolute;inset:8%;
  background:
   repeating-linear-gradient(90deg,transparent 0 18px,rgba(127,211,255,.55) 18px 22px) top/100% 14% no-repeat,
   repeating-linear-gradient(90deg,transparent 0 18px,rgba(127,211,255,.55) 18px 22px) bottom/100% 14% no-repeat,
   repeating-linear-gradient(0deg,transparent 0 18px,rgba(127,211,255,.55) 18px 22px) left/14% 100% no-repeat,
   repeating-linear-gradient(0deg,transparent 0 18px,rgba(127,211,255,.55) 18px 22px) right/14% 100% no-repeat;
  -webkit-mask:linear-gradient(#000,#000) top/72% 14% no-repeat,linear-gradient(#000,#000) bottom/72% 14% no-repeat,linear-gradient(#000,#000) left/14% 72% no-repeat,linear-gradient(#000,#000) right/14% 72% no-repeat;
          mask:linear-gradient(#000,#000) top/72% 14% no-repeat,linear-gradient(#000,#000) bottom/72% 14% no-repeat,linear-gradient(#000,#000) left/14% 72% no-repeat,linear-gradient(#000,#000) right/14% 72% no-repeat}
.meta{position:relative;margin-top:72px;border-top:1px solid rgba(255,255,255,.18)}
.meta .wrap{display:grid;grid-template-columns:repeat(5,1fr);gap:0}
.meta div.m{padding:24px 20px 28px 0;min-width:0}
.meta div.m+div.m{padding-left:20px;border-left:1px solid rgba(255,255,255,.18)}
.meta span{display:block;font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:#7FD3FF}
.meta b{display:block;margin-top:6px;font-size:16px;line-height:1.35}
.meta small{display:block;color:var(--on-dark-2);font-size:13px;margin-top:2px}

/* Anchor nav */
.subnav{position:sticky;top:calc(env(safe-area-inset-top,0px) + 76px);z-index:40;background:#fff;border-bottom:1px solid var(--line)}
.subnav .wrap{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none}
.subnav .wrap::-webkit-scrollbar{display:none}
.subnav a{flex:none;padding:16px 14px;font-size:14px;font-weight:600;color:#3A4B63;border-bottom:3px solid transparent}
.subnav a:hover,.subnav a.on{color:var(--blue);border-bottom-color:var(--blue)}
.subnav a.cta{margin-left:auto;color:var(--blue);font-weight:800}

/* Overview */
.ov{display:grid;grid-template-columns:1.5fr 1fr;gap:48px;align-items:start}
.ov p{color:#33445C;margin-bottom:14px;max-width:680px}
.feats{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:28px}
.feat{display:flex;gap:14px;align-items:flex-start;padding:18px;border:1px solid var(--line);border-radius:14px}
.feat i{flex:none;width:12px;height:12px;margin-top:7px;background:var(--blue);transform:rotate(45deg);border-radius:2px}
.feat b{display:block}
.feat span{font-size:14px;color:var(--muted)}
.glance{background:var(--navy);color:#fff;border-radius:20px;padding:28px;position:sticky;top:156px}
.glance h3{font-size:18px;margin-bottom:16px}
.glance dl{display:grid;gap:0;margin-bottom:22px}
.glance dl div{display:grid;grid-template-columns:110px 1fr;gap:12px;padding:12px 0;border-top:1px solid rgba(255,255,255,.14)}
.glance dt{color:#7FD3FF;font-size:13px;font-weight:700}
.glance dd{font-size:15px;color:var(--on-dark)}
.glance .btn{width:100%;justify-content:center}

/* Learn cards */
.soft{background:var(--soft)}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:40px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;display:flex;flex-direction:column;gap:10px;transition:.2s}
.card:hover{border-color:var(--blue);box-shadow:0 12px 30px rgba(11,77,181,.10)}
.card .ic{width:40px;height:40px;border-radius:50%;border:2px solid var(--blue);display:grid;place-items:center}
.card .ic::after{content:"";width:12px;height:12px;border-radius:50%;background:var(--blue)}
.card p{color:var(--muted);font-size:15px}
.card .tag{align-self:flex-start;font-size:12px;font-weight:700;letter-spacing:.06em;color:var(--blue);background:#E8F0FC;border-radius:999px;padding:4px 12px}

/* Curriculum timeline */
.tl{margin-top:44px;display:grid;gap:12px;counter-reset:p}
.step{display:grid;grid-template-columns:96px 1fr auto;gap:20px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px}
.step .dur{font-size:26px;font-weight:800;color:var(--blue);font-variant-numeric:tabular-nums;line-height:1}
.step .dur small{font-size:13px;font-weight:600;color:var(--muted);margin-left:2px}
.step h3{font-size:17px}
.step .k{font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.step .lbl{font-size:12px;font-weight:700;padding:5px 12px;border-radius:999px;background:var(--soft);color:var(--blue-dark);white-space:nowrap}
.step.part{border-left:4px solid var(--blue)}
.step.ws{border-left:4px solid var(--sky)}
.step.ws .lbl{background:var(--sky);color:#fff}
.step.brk{background:transparent;border-style:dashed}
.step.brk h3{color:var(--muted);font-weight:600}
.tl-note{margin-top:18px;color:var(--muted);font-size:14px}

/* Tools */
.tools{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:40px}
.tool{border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;gap:8px}
.tool .grid{width:40px;height:40px;border-radius:10px;background:
  linear-gradient(var(--blue),var(--blue)) 0 0/18px 18px no-repeat,
  linear-gradient(var(--sky),var(--sky)) 22px 0/18px 18px no-repeat,
  linear-gradient(var(--sky),var(--sky)) 0 22px/18px 18px no-repeat,
  linear-gradient(var(--blue-dark),var(--blue-dark)) 22px 22px/18px 18px no-repeat}
.tool small{font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.tool p{color:var(--muted);font-size:15px}

/* Workshops */
.ws-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:40px}
.wsc{border-radius:20px;overflow:hidden;background:#fff;border:1px solid var(--line);display:flex;flex-direction:column}
.wsc .top{background:linear-gradient(120deg,var(--blue-dark),var(--blue));color:#fff;padding:26px 28px;position:relative}
.wsc .top small{font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:#9ED9FF}
.wsc .top h3{font-size:24px;margin-top:6px}
.wsc .top .t{position:absolute;right:24px;top:24px;font-weight:800;font-size:15px;background:rgba(255,255,255,.15);border-radius:999px;padding:6px 14px}
.wsc .body{padding:24px 28px;display:grid;gap:10px}
.wsc .body p{color:#33445C}
.wsc .chips{display:flex;flex-wrap:wrap;gap:8px}
.wsc .chips span{font-size:13px;font-weight:600;background:var(--soft);border-radius:999px;padding:5px 12px;color:var(--blue-dark)}

/* People */
.people{display:grid;grid-template-columns:1.2fr 1fr;gap:20px;margin-top:40px}
.expert{background:var(--navy);color:#fff;border-radius:20px;padding:32px;display:flex;gap:24px;align-items:center}
.avatar{flex:none;width:96px;height:96px;border-radius:50%;background:linear-gradient(145deg,var(--sky),var(--blue));display:grid;place-items:center;font-size:32px;font-weight:800}
.expert small{color:#7FD3FF;font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase}
.expert h3{font-size:26px;margin:4px 0 6px}
.expert p{color:var(--on-dark)}
.hosts{border:1px solid var(--line);border-radius:20px;padding:24px 28px;display:grid;gap:0}
.hosts h4{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.host{padding:12px 0;border-top:1px solid var(--line)}
.host b{display:block}
.host span{font-size:14px;color:var(--muted)}

/* Agenda */
.agenda-wrap{margin-top:40px;overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table{width:100%;border-collapse:collapse;min-width:640px}
th{background:var(--blue);color:#fff;text-align:left;font-size:13px;letter-spacing:.08em;text-transform:uppercase;padding:14px 20px}
td{padding:16px 20px;border-top:1px solid var(--line);vertical-align:top}
td.time{font-weight:800;color:var(--blue);white-space:nowrap;font-variant-numeric:tabular-nums}
td ul{padding-left:18px}
td em{color:var(--muted);font-style:normal;font-size:14px}
tr.main td{background:#F5F9FF}

/* FAQ */
.faq{margin-top:36px;display:grid;gap:12px;max-width:860px}
details{border:1px solid var(--line);border-radius:14px;background:#fff}
summary{cursor:pointer;list-style:none;padding:20px 24px;font-weight:700;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:22px;line-height:1;color:var(--blue);flex:none}
details[open] summary::after{content:"–"}
details p{padding:0 24px 20px;color:#33445C}

/* CTA */
.cta-band{background:linear-gradient(110deg,var(--blue-dark),var(--blue) 60%,var(--sky));color:#fff;text-align:center}
.cta-band .eyebrow{color:#CDEBFF}
.cta-band p{color:#DCEBFF;max-width:680px;margin:0 auto 30px;font-size:18px}
.cta-band .ctas{justify-content:center}
.pillars{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;max-width:900px;margin:40px auto 0}
.pillars span{border:1px solid rgba(255,255,255,.35);border-radius:12px;padding:14px 10px;font-weight:700;font-size:14px}

/* Footer */
footer{background:var(--navy);color:#B9CCEA;padding-block:64px 28px;font-size:15px}
.fgrid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:40px}
footer .flogo{background:#fff;display:inline-block;padding:10px 14px;border-radius:10px;margin-bottom:16px}
footer .flogo img{width:115px;height:34px;max-width:none}
footer h5{color:#fff;font-size:15px;margin-bottom:12px}
footer ul{list-style:none;display:grid;gap:8px}
footer a:hover{color:#fff}
.fbottom{margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:14px}

@media (max-width:900px){
  .menu{display:none;position:absolute;top:76px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:8px max(24px,env(safe-area-inset-right,0px)) 18px max(24px,env(safe-area-inset-left,0px));border-bottom:1px solid var(--line);box-shadow:0 16px 30px rgba(6,26,64,.08)}
  .menu.open{display:flex}
  .menu a{padding:12px 0;border-bottom:1px solid var(--line)}
  .dd{display:block;border-bottom:1px solid var(--line)}
  .dd-btn{width:100%;justify-content:space-between;padding:12px 0}
  .dd-panel{position:static;opacity:1;visibility:visible;transform:none;padding:0 0 10px;display:none}
  .dd.open .dd-panel{display:block}
  .dd-inner{border:0;box-shadow:none;padding:0 0 0 12px;min-width:0;background:transparent}
  .dd-group h6{border:0;padding:4px 0;margin:0 0 2px}
  .dd-group a{margin:0;padding:8px 10px;border-bottom:0!important}
  .burger{display:block}
  .nav-right .lang{display:none}
}
@media (max-width:1024px){
  .hero .wrap{grid-template-columns:1fr}
  .chip-ai{display:none}
  .meta .wrap{grid-template-columns:repeat(3,1fr)}
  .meta div.m:nth-child(4){padding-left:0;border-left:0}
  .ov,.people{grid-template-columns:1fr}
  .glance{position:static}
  .grid3,.tools{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  section{padding-block:64px}
  .brand .x,.brand .school{display:none}
  .meta .wrap{grid-template-columns:1fr 1fr}
  .meta div.m{padding-left:0!important;border-left:0!important;border-bottom:1px solid rgba(255,255,255,.12)}
  .grid3,.tools,.ws-grid,.feats,.fgrid{grid-template-columns:1fr}
  .pillars{grid-template-columns:1fr 1fr}
  .step{grid-template-columns:72px 1fr;gap:14px}
  .step .lbl{grid-column:2;justify-self:start}
  .expert{flex-direction:column;align-items:flex-start}
  .glance dl div{grid-template-columns:1fr;gap:2px}
}
@media (max-width:420px){
  .nav .btn{padding:9px 14px;font-size:14px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}