/* ============================================================
   3DSFLabelling — Cinematic Lab design system
   Two-layer tokens (primitive / semantic) + .theater context flip.
   See DESIGN.md.
   ============================================================ */
:root{
  /* primitive */
  --ink-900:#0a0b0d; --ink-800:#14161a; --ink-700:#1d2025;
  --paper:#ffffff; --paper-2:#f6f7f9; --line:#e9ebef; --gray-500:#5b626e;
  --emerald:#10b981; --emerald-ink:#059669; --emerald-bright:#34d399;
  --data-green:#2feb2f; --data-pink:#ffd9df;

  /* semantic — default = paper-white reading band */
  --bg:var(--paper); --surface:var(--paper-2); --surface-2:#fff;
  --text:var(--ink-900); --muted:var(--gray-500);
  --border:var(--line); --accent:var(--emerald); --accent-ink:var(--emerald-ink);

  --r-sm:12px; --r-md:16px; --r-lg:22px; --r-xl:30px; --r-pill:999px;
  --sh-sm:0 2px 8px rgba(10,11,13,.05);
  --sh-md:0 10px 30px rgba(10,11,13,.08);
  --sh-lg:0 30px 70px rgba(10,11,13,.16);
  --sans:"Inter",-apple-system,BlinkMacSystemFont,system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --ease:cubic-bezier(.22,.61,.36,1); --dur:.45s;
}
/* dark theater: flip semantics, components stay identical */
.theater{
  --bg:var(--ink-900); --surface:var(--ink-800); --surface-2:var(--ink-700);
  --text:#f3f5f7; --muted:#9aa3af; --border:rgba(255,255,255,.10);
  --accent-ink:var(--emerald-bright);
  background:var(--bg); color:var(--text);
}

/* ---------- base ---------- */
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:400 17px/1.65 var(--sans);color:var(--text);background:var(--bg);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
img,video,model-viewer{max-width:100%;display:block}
a{color:var(--accent-ink);text-decoration:none;transition:color var(--dur) var(--ease)}
a:hover{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.wrap{width:min(100% - 2.4rem,1080px);margin-inline:auto}
.wrap-wide{width:min(100% - 2.4rem,1280px);margin-inline:auto}
section{scroll-margin-top:84px}
.mono{font-family:var(--mono)}

/* ---------- nav + progress ---------- */
.progress{position:fixed;top:0;left:0;height:2px;width:var(--p,0%);
  background:var(--accent);z-index:60;transition:width .1s linear}
.nav{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:12px clamp(14px,4vw,40px);
  background:color-mix(in srgb,var(--bg) 70%,transparent);
  backdrop-filter:saturate(180%) blur(18px);-webkit-backdrop-filter:saturate(180%) blur(18px);
  border-bottom:1px solid var(--border)}
.nav-logo{font-weight:700;letter-spacing:-.02em;font-size:1.02rem;color:var(--text);white-space:nowrap}
.nav-logo span{color:var(--accent-ink)}
.nav-links{display:flex;gap:6px}
.nav-links a{color:var(--muted);font-size:.9rem;font-weight:500;padding:7px 12px;border-radius:var(--r-pill)}
.nav-links a:hover{color:var(--text);background:var(--surface)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:var(--r-pill);
  font:600 .95rem/1 var(--sans);cursor:pointer;border:1px solid transparent;white-space:nowrap;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease),color var(--dur) var(--ease)}
.btn svg{width:17px;height:17px}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--accent);color:#03130d;box-shadow:0 8px 24px rgba(16,185,129,.35)}
.btn-primary:hover{box-shadow:0 14px 34px rgba(16,185,129,.45);color:#03130d}
.btn-ghost{background:color-mix(in srgb,var(--text) 6%,transparent);color:var(--text);border-color:var(--border)}
.btn-ghost:hover{background:color-mix(in srgb,var(--text) 11%,transparent);color:var(--text)}
.btn-sm{padding:8px 14px;font-size:.82rem}

/* ---------- section headers ---------- */
.head{text-align:center;max-width:680px;margin:0 auto clamp(28px,5vw,52px)}
.eyebrow{display:inline-block;font:600 .72rem/1 var(--mono);letter-spacing:.18em;text-transform:uppercase;
  color:var(--accent-ink);margin-bottom:14px}
.head h2{font:300 clamp(1.9rem,4.2vw,3rem)/1.08 var(--sans);letter-spacing:-.025em;margin:0 0 14px}
.head h2 em{font-style:normal;font-weight:600;color:var(--accent-ink)}
.head p{color:var(--muted);font-size:1.05rem;margin:0}
.sec{padding:clamp(64px,9vw,120px) 0}

/* ---------- hero ---------- */
.hero{position:relative;min-height:92vh;display:grid;place-items:center;text-align:center;
  overflow:hidden;background:var(--ink-900);color:#fff}
.hero>video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.42;filter:saturate(1.1)}
.hero::after{content:"";position:absolute;inset:0;
  background:radial-gradient(120% 80% at 50% 0%,rgba(10,11,13,.25),rgba(10,11,13,.78) 55%,rgba(10,11,13,.96))}
.hero-in{position:relative;z-index:2;padding:96px 22px 76px;max-width:940px}
.hero .eyebrow{color:var(--emerald-bright)}
.chip{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border-radius:var(--r-pill);
  font:600 .74rem/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;
  color:#cfe9df;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);margin-bottom:26px}
.chip i{width:7px;height:7px;border-radius:50%;background:var(--emerald-bright);box-shadow:0 0 10px var(--emerald-bright)}
.hero h1{font:300 clamp(2.3rem,6.4vw,4.6rem)/1.04 var(--sans);letter-spacing:-.03em;margin:0 0 22px;color:#fff}
.hero h1 em{font-style:normal;font-weight:600;color:var(--emerald-bright);
  background:linear-gradient(120deg,var(--emerald-bright),#a7f3d0);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-lead{max-width:640px;margin:0 auto 30px;color:#c4cbd4;font-size:clamp(1rem,2.1vw,1.18rem);font-weight:300}
.authors{display:flex;flex-wrap:wrap;justify-content:center;gap:4px 18px;margin:0 auto 8px;max-width:780px;font-size:.96rem}
.authors a{color:#e7eaee;font-weight:400}
.authors a:hover{color:var(--emerald-bright)}
.authors sup{color:var(--emerald-bright);font-weight:600}
.affils{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 22px;color:#9aa3af;font-size:.86rem;margin-bottom:34px}
.affils a{color:#9aa3af}.affils a:hover{color:#fff}
.affils sup{color:var(--emerald-bright)}
.cta{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.hero .btn-ghost{background:rgba(255,255,255,.07);color:#fff;border-color:rgba(255,255,255,.22);backdrop-filter:blur(6px)}
.hero .btn-ghost:hover{background:rgba(255,255,255,.14);color:#fff}
.scroll-cue{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);z-index:2;color:rgba(255,255,255,.6);
  animation:bob 2.2s var(--ease) infinite}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}

/* ---------- abstract + stats ---------- */
.abstract{max-width:68ch;margin:0 auto;font-size:1.12rem;line-height:1.8;color:var(--text)}
.abstract b{color:var(--accent-ink);font-weight:600}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(12px,2vw,20px);margin-top:clamp(36px,5vw,56px)}
.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:clamp(22px,3vw,34px) 18px;text-align:center;box-shadow:var(--sh-sm)}
.stat b{display:flex;align-items:baseline;justify-content:center;gap:2px;
  font:600 clamp(2.1rem,5.4vw,3.3rem)/1 var(--sans);letter-spacing:-.04em;color:var(--accent-ink)}
.stat b i{font-style:normal;font-size:.42em;font-weight:600;color:var(--muted);margin-left:3px}
.stat span{display:block;margin-top:10px;color:var(--muted);font-size:.88rem;font-weight:500}

/* ---------- figure card + pipeline + lightbox ---------- */
.figure{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--r-xl);
  padding:clamp(16px,3vw,30px);box-shadow:var(--sh-md);overflow:hidden}
.figure img{width:100%;border-radius:var(--r-md);cursor:zoom-in;transition:transform var(--dur) var(--ease)}
.figure img:hover{transform:scale(1.01)}
.caption{margin:18px auto 0;max-width:80ch;color:var(--muted);font-size:.9rem;line-height:1.6;text-align:center}
.caption b{color:var(--text);font-weight:600}
.pipeline{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(12px,2vw,18px);margin-top:clamp(28px,4vw,44px)}
.step{position:relative;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--r-lg);
  padding:26px 22px;transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}
.step:hover{transform:translateY(-4px);border-color:color-mix(in srgb,var(--accent) 50%,var(--border));box-shadow:var(--sh-md)}
.step .n{font:600 .8rem/1 var(--mono);color:var(--accent-ink);letter-spacing:.1em}
.step h4{text-align:left;margin:14px 0 8px;font-size:1.08rem;font-weight:600;color:var(--text)}
.step p{margin:0;color:var(--muted);font-size:.92rem;line-height:1.55}
.lb{position:fixed;inset:0;z-index:99;display:grid;place-items:center;cursor:zoom-out;padding:24px;
  background:rgba(8,9,11,.94);backdrop-filter:blur(10px);animation:fade .35s var(--ease)}
.lb img{max-width:94vw;max-height:92vh;border-radius:var(--r-md);box-shadow:var(--sh-lg)}
.lb-hint{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);color:#9aa3af;
  font:500 .8rem/1 var(--mono);letter-spacing:.05em}
@keyframes fade{from{opacity:0}}

/* ---------- results theater ---------- */
.exhibit{background:#fff;border-radius:var(--r-xl);padding:clamp(12px,2vw,20px);box-shadow:var(--sh-lg);
  border:1px solid rgba(255,255,255,.08)}
.exhibit img{width:100%;border-radius:var(--r-lg);cursor:zoom-in}
.tabs{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:clamp(36px,5vw,56px) 0 22px}
.tab{padding:10px 20px;border-radius:var(--r-pill);font:600 .92rem/1 var(--sans);cursor:pointer;
  color:var(--muted);background:transparent;border:1px solid var(--border);
  transition:all var(--dur) var(--ease)}
.tab:hover{color:var(--text);border-color:color-mix(in srgb,var(--text) 30%,var(--border))}
.tab.on{color:#03130d;background:var(--accent);border-color:var(--accent);box-shadow:0 8px 22px rgba(16,185,129,.3)}
.panel{display:none}.panel.on{display:block;animation:fade .4s var(--ease)}
.seg{display:inline-flex;padding:5px;gap:4px;border-radius:var(--r-pill);background:var(--surface);
  border:1px solid var(--border);margin:0 auto 26px}
.seg-wrap{text-align:center}
.seg button{padding:8px 18px;border-radius:var(--r-pill);border:0;cursor:pointer;background:transparent;
  color:var(--muted);font:600 .85rem/1 var(--sans);transition:all var(--dur) var(--ease)}
.seg button.on{background:var(--surface-2);color:var(--text);box-shadow:var(--sh-sm)}
.sub{display:none}.sub.on{display:block;animation:fade .4s var(--ease)}

.cmp3d{display:grid;grid-template-columns:1fr 1fr;gap:clamp(12px,2vw,22px)}
.viewer{position:relative;border-radius:var(--r-lg);overflow:hidden;background:#0c0d10;
  border:1px solid var(--border);box-shadow:var(--sh-md)}
.viewer model-viewer{width:100%;height:clamp(280px,40vh,430px);background:#161719;
  --poster-color:transparent}
.viewer .label{position:absolute;left:14px;bottom:14px;display:inline-flex;align-items:center;gap:7px;
  padding:7px 14px;border-radius:var(--r-pill);font:600 .82rem/1 var(--sans);z-index:2;backdrop-filter:blur(8px)}
.label-ours{background:var(--accent);color:#03130d}
.label-base{background:rgba(255,255,255,.08);color:#e7eaee;border:1px solid rgba(255,255,255,.22)}
.label a{color:inherit}
.badge-link{position:absolute;right:14px;top:14px;z-index:2;font:600 .72rem/1 var(--mono);letter-spacing:.05em;
  color:#9aa3af;background:rgba(0,0,0,.35);padding:6px 10px;border-radius:var(--r-pill);backdrop-filter:blur(6px)}
.sync-hint{text-align:center;margin:16px 0 0;color:var(--muted);font:500 .82rem/1.4 var(--mono);letter-spacing:.03em}
.sync-hint svg{width:15px;height:15px;vertical-align:-3px;margin-right:5px}

.legend{display:flex;flex-wrap:wrap;gap:10px 26px;justify-content:center;margin:24px auto 0;max-width:760px;
  padding:14px 22px;border-radius:var(--r-lg);background:var(--surface);border:1px solid var(--border)}
.legend span{display:inline-flex;align-items:center;gap:9px;color:var(--muted);font-size:.88rem}
.legend i{width:13px;height:13px;border-radius:50%;flex:none}
.dot-g{background:var(--data-green);box-shadow:0 0 10px rgba(47,235,47,.6)}
.dot-p{background:var(--data-pink);box-shadow:0 0 10px rgba(255,217,223,.5)}
.colorbar{max-width:560px;margin:0 auto 24px;text-align:center}
.colorbar .bar{background:#fff;border-radius:var(--r-pill);padding:8px 12px;box-shadow:var(--sh-sm)}
.colorbar .bar img{width:100%;border-radius:6px}
.colorbar .scale{display:flex;justify-content:space-between;margin-top:8px;color:var(--muted);
  font:500 .76rem/1 var(--mono);letter-spacing:.05em;text-transform:uppercase}

/* ---------- videos ---------- */
.vid-hero{margin:0 auto clamp(28px,4vw,44px);max-width:920px}
.vid-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;
  box-shadow:var(--sh-md)}
.vid-card .vt{padding:14px 20px;font:600 .92rem/1.3 var(--sans);color:var(--text);
  border-bottom:1px solid var(--border)}
.vid-card video{width:100%;aspect-ratio:16/9;object-fit:cover;background:#000;display:block}
.vid-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(14px,2vw,22px)}
.vid-grid .vt{font-size:.85rem;text-align:center}

/* ---------- bibtex + footer ---------- */
.bib{position:relative;background:var(--ink-800);border:1px solid rgba(255,255,255,.08);
  border-radius:var(--r-lg);padding:26px clamp(18px,3vw,30px);overflow-x:auto;box-shadow:var(--sh-md)}
.bib pre{margin:0;color:#e6e8eb;font:.84rem/1.7 var(--mono);white-space:pre}
.bib .k{color:var(--emerald-bright)}
.copy{position:absolute;top:14px;right:14px}
.footer{padding:clamp(48px,7vw,80px) 0 40px;text-align:center}
.footer .links{display:flex;flex-wrap:wrap;gap:10px 26px;justify-content:center;margin-bottom:22px}
.footer a{color:var(--muted);font-size:.92rem;font-weight:500}.footer a:hover{color:var(--accent-ink)}
.footer .meta{color:var(--muted);font-size:.84rem;line-height:1.7}
.footer .brand{font-weight:700;color:var(--text);letter-spacing:-.02em}
.footer .brand span{color:var(--accent-ink)}

/* ---------- reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(18px);
  transition:opacity .7s var(--ease),transform .7s var(--ease);transition-delay:var(--d,0s)}
[data-reveal].in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media(max-width:820px){
  .nav-links{display:none}
  .stats,.pipeline,.vid-grid{grid-template-columns:1fr}
  .cmp3d{grid-template-columns:1fr}
  .abstract{font-size:1.04rem}
}
@media(max-width:560px){
  body{font-size:16px}
  .cta .btn{flex:1 1 auto;justify-content:center}
  .tabs{gap:6px}.tab{padding:9px 15px;font-size:.85rem}
}
@media(prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important}
  [data-reveal]{opacity:1!important;transform:none!important;transition:none!important}
  .scroll-cue,.hero h1 em{animation:none!important}
  .btn:hover,.step:hover,.figure img:hover{transform:none!important}
}