/* Layout: letterboxed hero frame (2.39:1) + timecode labels; sections are data-driven so new categories (sự kiện, mảng mới) slot in as tabs/sections. */
:root{
  --bg:#F1F2F0; --fg:#111418; --muted:#5B636B; --line:#D3D6D8; --card:#E7E9E7;
  --accent:#D93A2B; --on-accent:#FFFFFF; --frame:#14181D; --frame-fg:#F2F3F2;
  --logo:url(logo.png);
  --f-display:"Archivo","Arial Narrow",Arial,sans-serif;
  --f-body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0F1215; --fg:#ECEEEF; --muted:#9AA2AA; --line:#2A3037; --card:#171B20;
  --accent:#FF5A47; --on-accent:#14181D; --frame:#1B2027; --frame-fg:#F2F3F2; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0F1215; --fg:#ECEEEF; --muted:#9AA2AA; --line:#2A3037; --card:#171B20;
  --accent:#FF5A47; --on-accent:#14181D; --frame:#1B2027; --frame-fg:#F2F3F2; color-scheme:dark}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--fg);font:400 16px/1.65 var(--f-body);
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:0}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--bg)}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.wrap{max-width:1200px;margin:0 auto}
h1,h2,h3{font-family:var(--f-display);margin:0;text-wrap:balance;line-height:1}
.mono{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.muted{color:var(--muted)}

/* header */
header{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--bg);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:20px;padding-block:14px;flex-wrap:wrap}
.logo{font:800 20px/1 var(--f-display);font-stretch:112%;letter-spacing:.02em;text-decoration:none;display:flex;align-items:center;gap:10px;white-space:nowrap}
.mark{display:block;width:48px;height:48px;flex:none;background:var(--logo) center/contain no-repeat}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .mark{filter:invert(1)}}
:root[data-theme="dark"] .mark{filter:invert(1)}
.bar{position:relative}
.menu{margin-left:auto;position:relative}
.menu-btn{display:flex;align-items:center;gap:10px;font:600 14px/1 var(--f-body);color:var(--fg);background:transparent;border:1px solid var(--line);border-radius:2px;padding:13px 18px;cursor:pointer}
.menu-btn:hover,.menu.open .menu-btn{border-color:var(--fg)}
.burger{width:18px;height:10px;position:relative;display:block}
.burger::before,.burger::after{content:"";position:absolute;left:0;right:0;height:1.5px;background:currentColor;transition:transform .2s ease,top .2s ease}
.burger::before{top:0}.burger::after{top:8.5px}
.menu.open .burger::before{top:4px;transform:rotate(45deg)}
.menu.open .burger::after{top:4px;transform:rotate(-45deg)}
.menu-panel{position:absolute;right:0;top:100%;padding-top:12px;width:min(340px,calc(100vw - 32px));z-index:40;
  opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .18s ease,transform .18s ease,visibility 0s .18s}
.menu.open .menu-panel{opacity:1;visibility:visible;transform:none;transition:opacity .18s ease,transform .18s ease}
@media (hover:hover){.menu:not(.shut):hover .menu-panel{opacity:1;visibility:visible;transform:none;transition:opacity .18s ease,transform .18s ease}.menu:not(.shut):hover .burger::before{top:4px;transform:rotate(45deg)}.menu:not(.shut):hover .burger::after{top:4px;transform:rotate(-45deg)}.menu:not(.shut):hover .menu-btn{border-color:var(--fg)}}
.menu-list{background:var(--bg);border:1px solid var(--fg);padding:8px 0;box-shadow:0 18px 40px rgba(0,0,0,.18)}
.menu-list a{display:flex;align-items:baseline;gap:16px;padding:14px 22px;text-decoration:none;font:700 22px/1.1 var(--f-display);text-transform:uppercase;letter-spacing:-.005em}
.menu-list a:hover,.menu-list a:focus-visible{background:var(--fg);color:var(--bg);outline-offset:-2px}
.bar>.btn{white-space:nowrap}
@media (max-width:480px){.bar{gap:10px}.logo{font-size:16px;gap:8px}.bar>.btn{display:none}}
.btn{display:inline-block;background:var(--accent);color:var(--on-accent);font:600 14px/1 var(--f-body);padding:13px 20px;border:0;border-radius:2px;text-decoration:none;cursor:pointer}
.btn:hover{filter:brightness(1.08)}
.btn.ghost{background:transparent;color:var(--fg);border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--fg)}

/* hero */
.hero{padding-block:clamp(32px,6vw,72px) 40px}
.hero h1{font-size:clamp(40px,9.2vw,128px);font-weight:900;font-stretch:100%;letter-spacing:-.02em;text-transform:uppercase;line-height:.92}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero-sub{display:flex;gap:24px 48px;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;margin-top:28px}
.hero-sub p{max-width:46ch;margin:0;color:var(--muted);font-size:17px;min-width:0}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.reel{position:relative;margin-top:40px;aspect-ratio:2.39/1;width:100%;max-width:100%;overflow:hidden;background:
  radial-gradient(120% 140% at 78% 30%,#3B4A5A 0%,rgba(20,24,29,0) 55%),
  linear-gradient(115deg,#0E1217 0%,#1D2630 55%,#2B3744 100%);color:var(--frame-fg);min-height:150px}
.reel::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(0deg,rgba(255,255,255,.03) 0 1px,transparent 1px 3px);pointer-events:none}
.reel .tl,.reel .tr,.reel .bl,.reel .br{position:absolute;z-index:2}
.reel .tl{top:14px;left:16px;display:flex;align-items:center;gap:8px}
.reel .tr{top:14px;right:16px}
.reel .bl{bottom:14px;left:16px}
.reel .br{bottom:14px;right:16px}
.rec{width:9px;height:9px;border-radius:50%;background:#FF5A47;animation:blink 1.6s steps(2,jump-none) infinite}
@keyframes blink{50%{opacity:.25}}
.reel .mid{position:absolute;inset:0;display:grid;place-items:center;z-index:1}
.play{width:72px;height:72px;border-radius:50%;border:1.5px solid rgba(255,255,255,.7);display:grid;place-items:center}
.play::before{content:"";border-left:18px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:5px}
.corner{position:absolute;width:22px;height:22px;border:1.5px solid rgba(255,255,255,.5);z-index:2}
.c1{top:44px;left:16px;border-right:0;border-bottom:0}.c2{top:44px;right:16px;border-left:0;border-bottom:0}
.c3{bottom:44px;left:16px;border-right:0;border-top:0}.c4{bottom:44px;right:16px;border-left:0;border-top:0}
@media (max-width:560px){.corner{display:none}.play{width:52px;height:52px}.play::before{border-left-width:13px;border-top-width:8px;border-bottom-width:8px}}

/* sections */
section{padding-block:clamp(48px,8vw,96px);border-top:1px solid var(--line)}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px 32px;flex-wrap:wrap;margin-bottom:32px}
.sec-head h2{font-size:clamp(32px,5.5vw,64px);font-weight:800;text-transform:uppercase;letter-spacing:-.01em}
.sec-head p{margin:0;max-width:44ch;color:var(--muted);min-width:0}
.eyebrow{display:block;color:var(--accent);margin-bottom:12px}

.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:28px}
.tab{font:500 13px/1 var(--f-body);padding:10px 16px;border:1px solid var(--line);background:transparent;color:var(--fg);border-radius:999px;cursor:pointer}
.tab[aria-pressed="true"]{background:var(--fg);color:var(--bg);border-color:var(--fg)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,340px),1fr));gap:28px 20px}
.work{display:flex;flex-direction:column;gap:12px;min-width:0}
.thumb{position:relative;aspect-ratio:16/9;max-width:100%;overflow:hidden;color:var(--frame-fg);display:flex;flex-direction:column;justify-content:space-between;padding:12px 14px}
.thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.05),rgba(0,0,0,.45))}
.thumb>*{position:relative;z-index:1}
.thumb .dur{align-self:flex-end;background:rgba(0,0,0,.55);padding:3px 7px}
.thumb .big{font:800 clamp(22px,3vw,30px)/1 var(--f-display);text-transform:uppercase;letter-spacing:-.01em;max-width:14ch}
.work h3{font-size:20px;font-weight:700;line-height:1.2;font-stretch:100%}
.meta{display:flex;justify-content:space-between;gap:12px;color:var(--muted);flex-wrap:wrap}
.note{margin-top:28px;color:var(--muted);font-size:14px}
/* video thật: ảnh bìa YouTube, chỉ tải trình phát khi bấm */
.vthumb{position:relative;display:block;width:100%;padding:0;border:0;background:#000;aspect-ratio:16/9;overflow:hidden;cursor:pointer;color:#fff}
.vthumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block;transition:transform .4s ease,opacity .3s ease}
.vthumb:hover img{transform:scale(1.04);opacity:.85}
.vthumb .play{position:absolute;inset:0;margin:auto;background:rgba(0,0,0,.45)}
.vthumb iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* process */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:0;border-top:1px solid var(--line)}
.step{padding:24px 20px 8px 0;min-width:0}
.step .mono{color:var(--accent)}
.step h3{font-size:24px;font-weight:700;margin:12px 0 8px;text-transform:uppercase;font-stretch:100%}
.step p{margin:0;color:var(--muted);font-size:15px}

/* events */
.events{border-top:1px solid var(--fg)}
.ev{display:grid;grid-template-columns:110px minmax(0,1fr) auto;gap:8px 24px;align-items:baseline;padding:20px 0;border-bottom:1px solid var(--line)}
.ev h3{font-size:clamp(20px,2.6vw,28px);font-weight:700;font-stretch:100%;text-transform:uppercase;line-height:1.1}
.ev p{margin:6px 0 0;color:var(--muted);font-size:15px}
.tag{border:1px solid var(--line);padding:5px 10px;border-radius:999px;white-space:nowrap;font-size:11px}
@media (max-width:640px){.ev{grid-template-columns:minmax(0,1fr)}.ev .tag{justify-self:start}}

/* about */
.about{max-width:760px}
.page-hero{padding-block:clamp(32px,6vw,72px) 24px}
.page-hero h1{font-size:clamp(40px,8vw,104px);font-weight:900;font-stretch:100%;letter-spacing:-.02em;text-transform:uppercase;line-height:.95}
.page-body{padding-block:24px clamp(48px,8vw,96px)}
.page-body p{margin:0 0 16px;font-size:18px;max-width:62ch}
@media (max-width:820px){.about{grid-template-columns:minmax(0,1fr)}}
.about p{margin:0 0 16px;font-size:18px;max-width:58ch}

/* contact */
.contact{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:40px 64px}
@media (max-width:820px){.contact{grid-template-columns:minmax(0,1fr)}}
.contact h2{font-size:clamp(36px,6vw,72px);font-weight:900;text-transform:uppercase;letter-spacing:-.01em}
.info{margin-top:24px;display:grid;gap:14px}
.info div span{display:block;color:var(--muted)}
form{display:grid;gap:16px}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));gap:16px}
label{display:grid;gap:6px;font-size:13px;color:var(--muted)}
input,select,textarea{font:400 16px/1.4 var(--f-body);color:var(--fg);background:transparent;border:0;border-bottom:1.5px solid var(--line);padding:10px 0;border-radius:0;width:100%;min-width:0}
select option{background:var(--bg);color:var(--fg)}
input:focus,select:focus,textarea:focus{outline:none;border-bottom-color:var(--accent)}
textarea{min-height:110px;resize:vertical}
#msg{min-height:22px;font-size:14px;color:var(--muted)}

footer{border-top:1px solid var(--line);padding-block:28px 40px;display:flex;justify-content:space-between;gap:12px 24px;flex-wrap:wrap;color:var(--muted);font-size:13px}
/* zalo */
.zalo-btn{position:fixed;right:max(16px,env(safe-area-inset-right,0px));bottom:max(16px,env(safe-area-inset-bottom,0px));z-index:35;width:58px;height:58px;border-radius:50%;background:#0068FF;color:#fff;font:800 15px/1 var(--f-body);text-decoration:none;display:grid;place-items:center;box-shadow:0 8px 24px rgba(0,104,255,.4)}
.zalo-btn:hover{filter:brightness(1.1)}
/* xem tất cả (hộp thoại) */
.more{margin-top:32px;display:flex;align-items:center;gap:16px 24px;flex-wrap:wrap}
.more span{color:var(--muted);font-size:14px}
dialog.all{width:min(1200px,100vw);max-width:100vw;height:100dvh;max-height:100dvh;margin:0 auto;padding:0;border:0;background:var(--bg);color:var(--fg)}
dialog.all::backdrop{background:rgba(0,0,0,.6)}
.all-bar{position:sticky;top:0;z-index:2;background:var(--bg);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:16px;padding:16px max(16px,env(safe-area-inset-left,0px))}
.all-bar h2{font-size:clamp(22px,3.4vw,36px);font-weight:800;text-transform:uppercase}
.all-body{padding:28px max(16px,env(safe-area-inset-left,0px)) 56px}
body.lock{overflow:hidden}
@media (prefers-reduced-motion:reduce){.rec{animation:none}html{scroll-behavior:auto}.menu-panel,.burger::before,.burger::after{transition:none}}
.form-title{margin:0;font:700 20px/1.2 var(--f-display);text-transform:uppercase;font-stretch:100%}
section[id]{scroll-margin-top:84px}
footer{padding-right:84px}

/* gọn hơn: sự kiện */
#su-kien{padding-block:clamp(32px,5vw,56px)}
#su-kien .sec-head{margin-bottom:20px}
#su-kien .ev{padding:14px 0}
#su-kien .ev p{margin-top:4px}