/* Duy Ta — portfolio
   Dark, monochrome stills, one accent. Fonts: Inter Tight (display), Inter (text),
   JetBrains Mono (data), Newsreader italic (accent). */

:root{
  --bg:#0B0B0B;
  --bg-2:#161616;
  --fg:#F2F2EF;
  --fg-2:#A3A39E;
  --fg-3:#6E6E6A;
  --line:rgba(242,242,239,.13);
  --accent:#FF4A1C;
  --radius:10px;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --display:"Inter Tight","Inter",system-ui,sans-serif;
  --serif:"Newsreader","Iowan Old Style","Times New Roman",serif;
  --mono:"JetBrains Mono","SF Mono",Menlo,Consolas,monospace;
  --gutter:clamp(16px,4vw,48px);
  --max:1400px;
  --grain:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='320' height='320'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:64px;overflow-x:clip}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
::selection{background:var(--accent);color:#fff}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3,p{margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.02em;color:var(--fg-3)}
.skip{position:absolute;left:-999px;top:8px;z-index:200;background:var(--fg);color:var(--bg);padding:8px 12px;border-radius:999px}
.skip:focus{left:12px}

/* ---------- header ---------- */
.hdr{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:20px;height:64px;padding:0 var(--gutter);color:#fff;transition:background .35s,color .35s}
.hdr::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--line);opacity:0;transition:opacity .35s}
.hdr.is-solid{color:var(--fg);background:rgba(11,11,11,.72);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.hdr.is-solid::after{opacity:1}
.brand{font-family:var(--display);font-weight:600;font-size:17px;letter-spacing:-.01em;display:flex;align-items:center;gap:10px}
.brand .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);animation:pulse 2.4s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(255,74,28,.45)}70%{box-shadow:0 0 0 8px rgba(255,74,28,0)}100%{box-shadow:0 0 0 0 rgba(255,74,28,0)}}
.nav{display:flex;align-items:center;gap:28px;font-size:14px;font-weight:500}
.nav a{position:relative;padding:6px 0}
.nav a::after{content:"";position:absolute;left:0;right:0;bottom:2px;height:1.5px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .25s}
.nav a:hover::after,.nav a.is-active::after{transform:scaleX(1)}
.hdr-right{display:flex;align-items:center;gap:14px}
.status{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;letter-spacing:.02em;opacity:.9}
.btn{display:inline-flex;align-items:center;gap:8px;height:38px;padding:0 16px;border-radius:999px;font-size:14px;font-weight:500;background:#fff;color:#0E0E0D;transition:transform .2s,background .3s,color .3s}
.btn:hover{transform:translateY(-1px)}
.hdr.is-solid .btn{background:var(--fg);color:var(--bg)}
.btn .arr{display:inline-block;transition:transform .25s}
.btn:hover .arr{transform:translate(2px,-2px)}
.menu-btn{display:none;font-size:14px;font-weight:500}

/* ---------- mobile menu ---------- */
.mmenu{position:fixed;inset:0;z-index:60;background:var(--bg);color:var(--fg);display:none;flex-direction:column;padding:16px var(--gutter) 32px}
.mmenu.is-open{display:flex}
.mmenu-top{display:flex;justify-content:space-between;align-items:center;height:48px;font-weight:500}
.mmenu nav{display:grid;padding-top:24px}
.mmenu nav a{font-family:var(--display);font-weight:600;font-size:44px;letter-spacing:-.03em;line-height:1.1;padding:12px 0;border-bottom:1px solid var(--line)}
.mmenu-foot{margin-top:auto;display:grid;gap:10px}

/* ---------- hero ---------- */
.hero{position:relative;height:100vh;height:100svh;min-height:560px;overflow:hidden;background:#1a1a19;color:#fff}
.hero-media{position:absolute;inset:0}
.hero-media img,.hero-media video{width:100%;height:100%;object-fit:cover;filter:grayscale(1) contrast(1.05) brightness(.8)}
.hero-media img{animation:kenburns 48s ease-in-out infinite alternate}
.hero-media video::-webkit-media-controls,.hero-media video::-webkit-media-controls-start-playback-button{display:none!important;-webkit-appearance:none}
.hero-media::after{content:"";position:absolute;inset:0;background:linear-gradient(to bottom,rgba(0,0,0,.45) 0%,rgba(0,0,0,0) 30%,rgba(0,0,0,0) 50%,rgba(0,0,0,.72) 100%)}
.grain{position:absolute;inset:-20%;background:var(--grain);background-size:320px 320px;opacity:.26;mix-blend-mode:soft-light;pointer-events:none;animation:grain 1.2s steps(3) infinite}
@keyframes kenburns{from{transform:scale(1)}to{transform:scale(1.07)}}
@keyframes grain{0%{transform:translate(0,0)}33%{transform:translate(-3%,2%)}66%{transform:translate(2%,-3%)}100%{transform:translate(0,0)}}
.hero-bottom{position:absolute;left:0;right:0;bottom:0;z-index:2;padding:0 var(--gutter) 40px;display:flex;align-items:flex-end;justify-content:space-between;gap:32px}
.hero-line{font-family:var(--serif);font-style:italic;font-weight:300;font-size:clamp(20px,2.2vw,30px);color:rgba(255,255,255,.85);margin-bottom:14px}
.hero h1{font-family:var(--display);font-weight:700;font-size:clamp(56px,11vw,180px);line-height:.92;letter-spacing:-.045em;text-wrap:balance}
.hero-sub{margin-top:18px;display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;font-size:16px;color:rgba(255,255,255,.85)}
.hero-sub .sep{width:4px;height:4px;border-radius:50%;background:rgba(255,255,255,.5)}
.play{display:inline-flex;align-items:center;gap:12px;height:52px;padding:0 20px 0 8px;border-radius:999px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.35);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);font-size:14px;font-weight:500;white-space:nowrap;transition:background .3s,transform .2s}
.play:hover{background:#fff;color:#0E0E0D;transform:translateY(-1px)}
.play .ring{width:36px;height:36px;border-radius:50%;background:#fff;color:#0E0E0D;display:grid;place-items:center}
.play .ring svg{width:12px;height:12px;margin-left:2px;fill:currentColor}
.play .mono{color:inherit;opacity:.7}

/* ---------- sections ---------- */
.sec{padding:clamp(80px,10vw,140px) var(--gutter) 0;max-width:calc(var(--max) + 2*var(--gutter));margin-left:auto;margin-right:auto}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:36px}
.sec-head h2{font-family:var(--display);font-weight:600;font-size:clamp(34px,4.6vw,56px);letter-spacing:-.035em;line-height:1}
.kicker{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.kicker .n{font-family:var(--mono);font-size:12px;color:var(--fg-3)}
.kicker .l{width:28px;height:1px;background:var(--fg-3)}
.kicker span:last-child{font-size:13px;font-weight:500;color:var(--fg-2)}
/* reveal on scroll */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* featured tiles */
.feat{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;margin-bottom:56px}
.feat:not(:has(.tile:not([hidden]))){display:none}
.tile{display:block}
.tile[hidden]{display:none}
.tile-media{position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:var(--radius);background:var(--bg-2)}
.tile-media::before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,var(--line) 0,var(--line) 1px,transparent 1px,transparent 14px);background-size:14px 14px}
.tile-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:grayscale(1) contrast(1.02) brightness(.92);transform:scale(1.001);transition:transform 1.2s cubic-bezier(.2,.7,.2,1),filter .6s}
.tile:hover .tile-media img{transform:scale(1.035);filter:grayscale(0)}
.tile-media .prev{position:absolute;right:14px;bottom:14px;z-index:2;display:inline-flex;align-items:center;gap:8px;height:34px;padding:0 12px 0 6px;border-radius:999px;background:#fff;color:#0E0E0D;font-size:13px;font-weight:500;opacity:0;transform:translateY(6px);transition:opacity .3s,transform .3s}
.tile-media .prev .ring{width:22px;height:22px;border-radius:50%;background:#0E0E0D;color:#fff;display:grid;place-items:center}
.tile-media .prev svg{width:9px;height:9px;margin-left:1px;fill:currentColor}
.tile:hover .tile-media .prev{opacity:1;transform:none}
.tile-cap{display:grid;gap:5px;padding-top:12px}
.tile-cap h3{font-family:var(--display);font-weight:600;font-size:21px;letter-spacing:-.02em;line-height:1.2;text-wrap:balance}
.tile-cap .mono{white-space:nowrap}

/* groups + archive */
.group{margin-bottom:56px}
.group-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap;padding-bottom:14px;margin-bottom:20px;border-bottom:1px solid var(--line)}
.group-name{font-size:14px;font-weight:500;display:inline-flex;align-items:center;gap:10px}
.group-name .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:pulse 2.4s infinite}
.feat{grid-template-columns:repeat(3,minmax(0,1fr));margin-bottom:0}
.tile-cap h3{font-size:18px}
.archive{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.archive summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:18px;padding:22px 0}
.archive summary::-webkit-details-marker{display:none}
.archive summary .mono{flex:1;min-width:0}
.archive summary .plus{width:34px;height:34px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;font-family:var(--mono);font-size:16px;color:var(--fg-2);transition:transform .3s,background .3s,color .3s}
.archive summary:hover .plus{background:var(--fg);color:var(--bg);border-color:var(--fg)}
.archive[open] summary .plus{transform:rotate(45deg)}
.arch{padding:6px 0 28px;display:grid;gap:6px}
.arch-row{display:grid;grid-template-columns:260px minmax(0,1fr);gap:16px 28px;padding:16px 0;border-top:1px solid var(--line);align-items:start}
.arch-k{display:grid;gap:3px}
.arch-name{font-family:var(--display);font-weight:600;font-size:16px;letter-spacing:-.01em}
.pills{display:flex;flex-wrap:wrap;gap:8px}
.pill{display:inline-flex;align-items:center;gap:8px;height:34px;padding:0 13px;border-radius:999px;border:1px solid var(--line);font-size:13px;font-weight:500;color:var(--fg);transition:background .25s,color .25s,border-color .25s;white-space:nowrap}
.pill .mono{font-size:11px;color:var(--fg-3);transition:color .25s}
a.pill:hover{background:var(--fg);color:var(--bg);border-color:var(--fg)}
a.pill:hover .mono{color:var(--bg);opacity:.7}
.pill.is-static{color:var(--fg-2);cursor:default}
.peek{position:fixed;z-index:40;width:300px;aspect-ratio:16/9;border-radius:8px;overflow:hidden;pointer-events:none;opacity:0;transform:translate(-50%,-50%) scale(.96) rotate(-1.5deg);transition:opacity .25s,transform .25s;box-shadow:0 20px 50px rgba(0,0,0,.45);background:var(--bg-2)}
.peek.on{opacity:1;transform:translate(-50%,-50%) scale(1) rotate(0deg)}
.peek img{width:100%;height:100%;object-fit:cover}
.index-foot{display:flex;justify-content:space-between;align-items:center;padding-top:16px}
.empty{padding:40px 0;color:var(--fg-3);font-size:14px;display:none}
.empty.show{display:block}

/* ticker */
.ticker{margin-top:clamp(80px,10vw,140px);border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden;padding:16px 0;-webkit-mask-image:linear-gradient(to right,transparent,#000 8%,#000 92%,transparent);mask-image:linear-gradient(to right,transparent,#000 8%,#000 92%,transparent)}
.ticker-track{display:flex;width:max-content;will-change:transform;animation:ticker var(--dur,40s) linear infinite}
.ticker:hover .ticker-track{animation-play-state:paused}
.ticker-track span{display:inline-flex;align-items:center;gap:22px;padding-right:22px;font-family:var(--mono);font-size:12px;letter-spacing:.04em;text-transform:uppercase;color:var(--fg-2);white-space:nowrap}
.ticker-track span i{font-style:normal;color:var(--accent)}
@keyframes ticker{from{transform:translateX(0)}to{transform:translateX(calc(-1 * var(--shift)))}}

/* about */
.about{display:grid;grid-template-columns:minmax(0,320px) minmax(0,1fr);gap:clamp(40px,5vw,80px);align-items:start}
.about-side{position:sticky;top:96px;display:grid;gap:16px}
.portrait{aspect-ratio:4/5;max-width:300px;border-radius:var(--radius);overflow:hidden;background:var(--bg-2);position:relative}
.portrait img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:grayscale(1)}
.card{max-width:300px;border-radius:14px;background:var(--bg-2);padding:18px;display:grid;gap:14px}
.card .k{font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--fg-3)}
.card .v{font-size:15px;font-weight:500;margin-top:3px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.card .v .dot{width:7px;height:7px;border-radius:50%;background:var(--accent)}
.card .v.soft{font-weight:400;color:var(--fg-2)}
.about-main .lead{font-family:var(--display);font-weight:600;font-size:clamp(28px,3.4vw,46px);letter-spacing:-.035em;line-height:1.08;text-wrap:balance}
.about-main .lead span{color:var(--fg-3)}
.about-body{margin-top:32px;max-width:72ch;display:grid;gap:18px;font-size:17px;line-height:1.6;color:var(--fg-2)}
.tags{margin-top:40px;display:flex;flex-wrap:wrap;gap:8px}
.tags span{height:32px;padding:0 12px;border-radius:999px;border:1px solid var(--line);font-size:13px;display:inline-flex;align-items:center;color:var(--fg-2)}

/* principles + timeline (inside About) */
.principles{margin-top:44px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px 32px;max-width:900px}
.pr h3{font-family:var(--display);font-weight:600;font-size:19px;letter-spacing:-.02em;line-height:1.2;margin-bottom:8px}
.pr p{font-size:14.5px;line-height:1.5;color:var(--fg-2)}
.timeline{margin-top:48px;border-top:1px solid var(--line);max-width:900px}
.tl{display:grid;grid-template-columns:120px 150px minmax(0,1fr);gap:14px;padding:13px 0;border-bottom:1px solid var(--line);align-items:baseline}
.tl-co{font-family:var(--display);font-weight:600;font-size:15px;letter-spacing:-.01em}
.tl-role{font-size:14px;color:var(--fg-2)}
/* behind the scenes: filmstrip of mixed formats, scroll sideways */
.bts{--edge:max(var(--gutter),calc((100vw - var(--max)) / 2));display:flex;align-items:flex-start;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;scroll-padding-left:var(--edge);scroll-padding-right:var(--edge);padding-bottom:12px;margin-left:calc(-1*var(--edge));margin-right:calc(-1*var(--edge));padding-left:var(--edge);padding-right:var(--edge);scrollbar-width:none}
.bts::-webkit-scrollbar{display:none}
.bts figure{flex:0 0 auto;margin:0;scroll-snap-align:start;max-width:min(560px,86vw)}
.bts img{height:clamp(240px,36vw,440px);width:auto;max-width:100%;object-fit:cover;border-radius:var(--radius);filter:grayscale(1) contrast(1.02);transition:filter .6s}
.bts figure:hover img{filter:grayscale(0)}
.bts figcaption{margin-top:10px;max-width:40ch}

/* contact */
.contact h2{font-family:var(--display);font-weight:700;font-size:clamp(40px,7.5vw,120px);letter-spacing:-.045em;line-height:.95;text-wrap:balance;max-width:14ch}
.contact h2 em{font-family:var(--serif);font-weight:300;font-style:italic;letter-spacing:0;color:var(--fg-2)}
.contact-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:20px 40px;margin-top:40px;padding-top:28px;border-top:1px solid var(--line)}
.mail{font-family:var(--display);font-weight:600;font-size:clamp(22px,3vw,34px);letter-spacing:-.025em;position:relative}
.mail::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;background:var(--accent);transform:scaleX(.18);transform-origin:left;transition:transform .35s}
.mail:hover::after{transform:scaleX(1)}
.links{display:flex;flex-wrap:wrap;gap:8px}
.links a{height:38px;padding:0 14px;border-radius:999px;border:1px solid var(--line);display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:500;transition:background .25s,color .25s,border-color .25s}
.links a:hover{background:var(--fg);color:var(--bg);border-color:var(--fg)}

/* footer */
.ftr{margin-top:clamp(80px,10vw,140px);padding:22px var(--gutter) 30px;max-width:calc(var(--max) + 2*var(--gutter));margin-left:auto;margin-right:auto;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-family:var(--mono);font-size:12px;color:var(--fg-3)}

/* modal / player */
.modal{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:var(--gutter)}
.modal[hidden]{display:none}
.modal-bg{position:absolute;inset:0;background:rgba(0,0,0,.92)}
.modal-box{position:relative;width:min(1100px,100%);color:#fff}
.modal-head{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:12px}
.modal-head .t{font-family:var(--display);font-weight:600;font-size:16px;letter-spacing:-.01em}
.modal-close{height:34px;padding:0 14px;border-radius:999px;border:1px solid rgba(255,255,255,.3);font-size:13px;font-weight:500;flex:none}
.modal-close:hover{background:#fff;color:#0E0E0D}
.player{aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#000}
.player iframe{width:100%;height:100%;border:0;display:block}
.modal-foot{margin-top:12px;display:flex;justify-content:space-between;gap:16px}
.modal-foot a{border-bottom:1px solid var(--line)}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .nav,.status{display:none}
  .menu-btn{display:block}
  .hdr .btn{display:none}
  .hero-bottom{flex-direction:column;align-items:flex-start;gap:22px;padding-bottom:28px}
  .hero-sub{flex-direction:column;align-items:flex-start;gap:4px}
  .hero-sub .sep{display:none}
  .feat{grid-template-columns:1fr;gap:28px}
  .arch-row{grid-template-columns:1fr;gap:10px}
  .pill{white-space:normal;height:auto;min-height:34px;padding:7px 13px}
  .sec-head>.mono{display:none}
  .peek{display:none}
  .about{grid-template-columns:1fr;gap:32px}
  .about-side{position:static;grid-template-columns:1fr 1fr;align-items:start}
  .portrait,.card{max-width:none}
  .principles{grid-template-columns:1fr;gap:18px}
  .tl{grid-template-columns:1fr;gap:3px}
  .contact-row{align-items:flex-start;flex-direction:column}
}
@media (max-width:520px){.about-side{grid-template-columns:1fr}}
@media (hover:none){.tile-media .prev{opacity:1;transform:none}.peek{display:none}}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .hero-media img,.grain,.ticker-track,.brand .dot{animation:none}
  .reveal{opacity:1;transform:none;transition:none}
  *{transition-duration:.01ms!important}
}