/* ============================================================
   STEAM — project site
   Theme: Ember (warm orange on white). Signature: the advantage curve.
   ============================================================ */

:root{
  --bg:#ffffff;
  --bg-tint:#fbf7f2;
  --ink:#1a1714;
  --ink-soft:#4a443d;
  --muted-text:#897f73;
  --rule:#ece6dd;
  --rule-strong:#ddd4c8;
  --ember:#ea580c;
  --ember-dark:#c2410c;
  --ember-soft:#fff3ea;
  --ember-soft2:#ffe6d3;
  --warm-dark:#1b1410;

  --font-display:'Space Grotesk',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --font-body:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --font-mono:'Space Mono',ui-monospace,SFMono-Regular,Menlo,monospace;

  --maxw:1140px;
  --nav-h:62px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--nav-h)}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--font-body);font-size:17px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img,video{max-width:100%;display:block}
a{color:var(--ember);text-decoration:none}
em{font-style:italic;color:inherit}
::selection{background:var(--ember-soft2);color:var(--ink)}

/* ---------- shared layout ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
.wrap.narrow{max-width:820px}
.section{padding:104px 0}
.section-tint{background:var(--bg-tint);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}

.eyebrow{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ember-dark);margin:0 0 18px;font-weight:700;
}
.eyebrow.light{color:#ffb98a}
.section-title{
  font-family:var(--font-display);font-weight:600;letter-spacing:-.015em;
  font-size:clamp(28px,4.4vw,46px);line-height:1.08;margin:0 0 22px;
}
.section-title .hl{color:var(--ember)}
.lede{font-size:clamp(17px,1.6vw,20px);color:var(--ink-soft);max-width:none;margin:0 0 40px}
.muted{color:var(--muted-text)}
.mono{font-family:var(--font-mono)}

/* ============================================================
   NAV
   ============================================================ */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:60;height:var(--nav-h);
  display:flex;align-items:center;transition:background .3s,box-shadow .3s,border-color .3s;
  border-bottom:1px solid transparent;
}
.topbar.scrolled{
  background:rgba(255,255,255,.82);backdrop-filter:blur(12px) saturate(1.4);
  border-bottom-color:var(--rule);box-shadow:0 1px 20px rgba(27,20,16,.05);
}
.bar-inner{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 28px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--font-display);font-weight:700;font-size:20px;letter-spacing:.02em;color:var(--ink);flex-shrink:0}
.brand-logo{width:30px;height:30px;object-fit:contain;display:block}
.foot-brand .brand-logo{width:34px;height:34px}
.topbar:not(.scrolled) .brand{color:#fff}
.nav-links{display:flex;gap:22px}
.nav-links a{font-size:14.5px;font-weight:500;color:var(--ink-soft);transition:color .2s;white-space:nowrap}
.nav-links a:hover{color:var(--ember)}
.topbar:not(.scrolled) .nav-links a{color:rgba(255,255,255,.86)}
.topbar:not(.scrolled) .nav-links a:hover{color:#fff}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:34px;height:30px;padding:5px}
.nav-toggle span{display:block;height:2px;background:var(--ink);margin:5px 0;border-radius:2px;transition:.25s}
.topbar:not(.scrolled) .nav-toggle span{background:#fff}

/* ============================================================
   HERO
   ============================================================ */
.hero{position:relative;min-height:100svh;display:flex;align-items:center;overflow:hidden;background:var(--warm-dark)}
.hero-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.hero-scrim{
  position:absolute;inset:0;z-index:1;
  background:
    linear-gradient(105deg, rgba(20,14,10,.92) 0%, rgba(20,14,10,.7) 38%, rgba(20,14,10,.28) 70%, rgba(20,14,10,.5) 100%),
    linear-gradient(0deg, rgba(20,14,10,.7), rgba(20,14,10,0) 30%);
}
.hero-inner{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;padding:96px 28px 120px;width:100%;color:#fff}
.hero-h1{font-family:var(--font-display);font-weight:600;font-size:clamp(23px,3.3vw,40px);line-height:1.16;letter-spacing:-.01em;color:#fff;max-width:21ch;margin:.12em 0 .34em}
.hm-mark{font-family:"Chalkboard SE","Chalkboard","Comic Sans MS",var(--font-display);font-weight:700;font-size:1.5em;letter-spacing:0;margin-right:.04em;background:linear-gradient(180deg,#ffb487,#ea580c 90%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hm-colon{font-family:"Chalkboard SE","Chalkboard","Comic Sans MS",var(--font-display);font-weight:700;font-size:1.5em;color:#ff8a4c}
.hm-rest{color:rgba(255,255,255,.94);font-weight:500}
.hero-title{font-size:clamp(16px,1.85vw,21px);line-height:1.45;max-width:52ch;color:rgba(255,255,255,.9);font-weight:400;margin:0 0 30px}
.hero-title em{color:#ffb98a;font-style:normal;font-weight:600}

.authors{display:flex;flex-wrap:wrap;gap:6px 20px;margin:0 0 8px;font-size:15.5px;color:rgba(255,255,255,.92);font-weight:500}
.authors sup{color:#ff8a4c;font-size:.7em}
.affils{display:flex;flex-wrap:wrap;gap:4px 18px;margin:0 0 34px;font-size:13.5px;color:rgba(255,255,255,.6)}
.affils sup{color:#ff8a4c}
.affils .legend{color:rgba(255,255,255,.5)}

.hero-links{display:flex;flex-wrap:wrap;gap:12px}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;border-radius:999px;font-weight:600;font-size:15px;
  background:var(--ember);color:#fff;border:1px solid var(--ember);
  transition:transform .18s var(--ease),background .2s,box-shadow .2s;
}
.btn:hover{transform:translateY(-2px);background:var(--ember-dark);box-shadow:0 8px 22px rgba(234,88,12,.34)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.4)}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff;box-shadow:none}
.btn-disabled{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.22);color:rgba(255,255,255,.62);cursor:not-allowed}
.btn-disabled:hover{transform:none;background:rgba(255,255,255,.08);box-shadow:none}
.btn .soon{font-family:var(--font-mono);font-style:normal;font-size:10px;letter-spacing:.08em;text-transform:uppercase;opacity:.7;border:1px solid currentColor;border-radius:4px;padding:1px 5px}

.scroll-cue{position:absolute;z-index:3;left:50%;bottom:26px;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:6px;color:rgba(255,255,255,.7);font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase}
.scroll-cue svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;animation:bob 1.8s var(--ease) infinite}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(6px)}}

/* ============================================================
   OVERVIEW
   ============================================================ */
.ov-fig{margin:0 0 56px;background:#fff;border:1px solid var(--rule);border-radius:24px;padding:18px 24px;box-shadow:0 18px 50px rgba(27,20,16,.06)}
.ov-fig svg{width:100%;height:auto;display:block}
.contrib-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:8px}
.card{
  background:var(--bg);border:1px solid var(--rule);border-radius:16px;padding:30px 26px;
  transition:transform .25s var(--ease),box-shadow .25s,border-color .25s;
}
.card:hover{transform:translateY(-4px);box-shadow:0 16px 40px rgba(27,20,16,.08);border-color:var(--rule-strong)}
.card-mark{height:30px;margin-bottom:18px;display:flex;align-items:center}
.card-mark svg{width:60px;height:24px;overflow:visible}
.card-mark svg path{fill:none;stroke:#e7c4ad;stroke-width:1.6;stroke-linecap:round}
.card-mark svg path.thick{stroke:var(--ember);stroke-width:2.6}
.card-mark.big{font-family:var(--font-display);font-weight:700;font-size:34px;color:var(--ember);height:auto;margin-bottom:14px}
.card h3{font-family:var(--font-display);font-weight:600;font-size:20px;margin:0 0 10px;letter-spacing:-.01em}
.card p{margin:0;font-size:15.5px;color:var(--ink-soft);line-height:1.6}

.teaser-fig{margin:0 0 40px;text-align:center}
.teaser-fig img{margin:0 auto;border:1px solid var(--rule);border-radius:14px;box-shadow:0 18px 50px rgba(27,20,16,.07)}
figcaption{font-size:14px;color:var(--muted-text);margin-top:16px;max-width:68ch;margin-left:auto;margin-right:auto;line-height:1.55}

/* ============================================================
   METHOD
   ============================================================ */
.method-fig{margin:0 0 48px;text-align:center}
.method-fig img{margin:0 auto;border:1px solid var(--rule);border-radius:14px;background:#fff;box-shadow:0 18px 50px rgba(27,20,16,.07)}

.steps{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:0;padding:0}
.step{position:relative;background:#fff;border:1px solid var(--rule);border-radius:16px;padding:28px 24px 24px;display:flex;flex-direction:column}
.step-no{font-family:var(--font-mono);font-size:13px;font-weight:700;color:var(--ember);letter-spacing:.1em;display:block;margin-bottom:12px}
.step h3{font-family:var(--font-display);font-weight:600;font-size:19px;margin:0 0 10px;letter-spacing:-.01em}
.step p{margin:0 0 16px;font-size:14.5px;color:var(--ink-soft);line-height:1.55}
.eq{font-size:13px;background:var(--ember-soft);border:1px solid var(--ember-soft2);border-radius:10px;padding:12px 14px;overflow-x:auto;margin-top:auto}
.eq .katex{color:var(--ember-dark);font-size:1.02em;white-space:nowrap}
.eq-stack{margin-top:auto;display:flex;flex-direction:column;gap:9px}
.eq-stack .eq{margin-top:0}

/* ---- frame-pair → bin diagram (Step 02): select → scale → predict ---- */
.binfig-wrap{margin:42px 0 0}
.binfig3{background:#fff;border:1px solid var(--rule);border-radius:18px;padding:30px 30px 34px;box-shadow:0 12px 38px rgba(27,20,16,.05)}
.pl-lanehead{display:flex;max-width:780px;margin:0 auto 12px;padding:0 18px;gap:16px}
.pl-lanehead .pl-step:first-child{flex:0 0 186px}
.pl-lanehead .pl-step:last-child{flex:1}
.pl-step{display:flex;align-items:center;gap:9px;font-family:var(--font-mono);font-size:12px;color:var(--muted-text)}
.pl-step b,.pl-plabel b{display:inline-block;font-family:var(--font-mono);font-size:11px;font-weight:700;letter-spacing:.04em;color:#fff;background:var(--ember);padding:3px 9px;border-radius:6px;white-space:nowrap}
.bf2-pill{font-family:var(--font-mono);font-size:13px;color:var(--ember-dark);background:var(--ember-soft);border:1px solid var(--ember-soft2);padding:9px 16px;border-radius:999px;white-space:nowrap}

.pl-lanes{display:flex;flex-direction:column;gap:12px;max-width:780px;margin:0 auto}
.pl-lane{display:flex;align-items:center;gap:16px;padding:11px 18px;border:1px solid var(--rule);border-left:4px solid var(--accent,#ddd);border-radius:13px;background:var(--bg-tint);cursor:pointer;transition:opacity .35s,box-shadow .2s,transform .2s,background .2s}
.pl-lane:hover{transform:translateX(2px);box-shadow:0 4px 16px rgba(27,20,16,.08)}
.pl-lane.is-sel{background:#fff;box-shadow:0 0 0 2px var(--accent,#ea580c) inset,0 6px 18px rgba(27,20,16,.07)}
.pl-lane:focus-visible{outline:2px solid var(--ember);outline-offset:2px}
.pl-hint{text-align:center;font-family:var(--font-mono);font-size:11.5px;color:var(--muted-text);margin:16px 0 0}
.pl-sel{display:flex;align-items:center;gap:9px;flex-shrink:0}
.pl-sel img{width:80px;height:60px;object-fit:cover;border-radius:8px;border:1px solid var(--rule-strong)}
.pl-sel .a{font-family:var(--font-mono);color:var(--muted-text);font-size:14px}
.pl-raw{font-family:var(--font-mono);font-size:13px;color:var(--muted-text);min-width:58px;text-align:center;flex-shrink:0}
.pl-op{font-family:var(--font-mono);font-size:12px;color:var(--ember-dark);background:#fff;border:1px solid var(--ember-soft2);border-radius:999px;padding:6px 11px;white-space:nowrap;flex-shrink:0}
.pl-scaled{display:flex;flex-direction:column;gap:6px;flex:1;min-width:130px}
.pl-bars{display:flex;flex-direction:column;gap:4px}
.pl-bar{height:8px;border-radius:999px;transition:width .5s var(--ease)}
.pl-bar.raw{background:var(--rule-strong)}
.pl-bar.sc{background:var(--accent,#ea580c)}
.pl-scaled b{font-family:var(--font-mono);font-size:13.5px;font-weight:700;color:var(--accent,#333)}

.pl-predict{display:flex;justify-content:center;margin:24px 0 0}
.pl-down{display:block;margin:0 auto;width:16px;height:32px;fill:none;stroke:var(--ember);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.pl-down-c{margin:6px auto 4px}

.pl-panel{background:var(--bg-tint);border:1px solid var(--rule);border-radius:14px;padding:18px 20px 16px}
.pl-single{max-width:680px;margin:0 auto}
.pl-plabel{display:flex;align-items:center;gap:9px;font-family:var(--font-mono);font-size:12.5px;font-weight:700;letter-spacing:.02em;color:var(--ink-soft);margin-bottom:12px}
.pl-chart{width:100%;height:auto;display:block}
.pl-chart rect{transition:opacity .4s}
.pl-chart .ktick{transition:opacity .4s}
.pl-legend{display:flex;align-items:center;justify-content:center;gap:6px;flex-wrap:wrap;margin:10px 0 0;font-family:var(--font-mono);font-size:11px;color:var(--muted-text)}
.pl-legend .lg-bar{display:inline-block;width:16px;height:10px;border-radius:2px;background:var(--ember);opacity:.85}
.pl-legend .lg-tri{color:var(--ember-dark)}
@media(max-width:760px){
  .pl-lanehead{display:none}
  .pl-lane{flex-wrap:wrap;gap:10px}
}

/* ============================================================
   ADVANTAGE VISUALIZATION
   ============================================================ */
.adv-task-tabs{margin-bottom:28px}
.adv-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.adv-placeholder{aspect-ratio:5/4;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:repeating-linear-gradient(45deg,#fbf7f2,#fbf7f2 12px,#f6f0e7 12px,#f6f0e7 24px);color:var(--muted-text)}
.adv-placeholder .ph-ico{width:40px;height:40px;border-radius:50%;border:2px dashed var(--rule-strong);display:flex;align-items:center;justify-content:center;color:var(--ember);font-size:16px}
.adv-placeholder span{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;text-align:center;padding:0 12px}
.adv-cell{background:#fff;border:1px solid var(--rule);border-radius:14px;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 6px 20px rgba(27,20,16,.05)}
.adv-cell .vid-box{position:relative;background:#0b0b0b;display:flex;align-items:center;justify-content:center}
.adv-marker{position:absolute;top:12px;left:50%;transform:translateX(-50%) translateY(-6px);display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.02em;color:#fff;background:var(--ember);padding:7px 14px;border-radius:999px;box-shadow:0 6px 18px rgba(234,88,12,.45);opacity:0;pointer-events:none;transition:opacity .35s,transform .35s;white-space:nowrap;z-index:2}
.adv-marker.show{opacity:1;transform:translateX(-50%) translateY(0)}
.adv-marker .dot{width:7px;height:7px;border-radius:50%;background:#fff;animation:mkpulse 1.4s ease-in-out infinite}
@keyframes mkpulse{0%,100%{box-shadow:0 0 0 2px rgba(255,255,255,.45)}50%{box-shadow:0 0 0 6px rgba(255,255,255,.08)}}
.adv-cell video{width:100%;max-height:62vh;display:block;background:#0b0b0b}
.adv-meta{padding:16px 18px}
.adv-meta .tag{display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;padding:5px 10px;border-radius:6px;margin-bottom:10px;font-weight:700}
.tag-good{background:var(--ember-soft);color:var(--ember-dark)}
.tag-warn{background:#fde9e0;color:#b1400f}
.tag-bad{background:#efeae3;color:#6b6258}
.adv-meta p{margin:0;font-size:14.5px;color:var(--ink-soft);line-height:1.55}

/* ============================================================
   DEMOS
   ============================================================ */
.task-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.task-tab{font-family:var(--font-body);font-weight:600;font-size:14.5px;cursor:pointer;padding:9px 16px;border-radius:999px;border:1px solid var(--rule-strong);background:#fff;color:var(--ink-soft);transition:.2s}
.task-tab:hover{border-color:var(--ember);color:var(--ember)}
.task-tab.is-active{background:var(--ember);color:#fff;border-color:var(--ember)}
.task-blurb{font-size:15.5px;color:var(--muted-text);margin:0 0 26px;min-height:1.4em}

.demo-grid{display:grid;gap:20px}
.demo-grid.cols-2{grid-template-columns:repeat(2,1fr)}
.demo-grid.cols-3{grid-template-columns:repeat(3,1fr)}
.demo-cell{display:flex;flex-direction:column;border-radius:13px;overflow:hidden;border:1px solid var(--rule);background:#fff;box-shadow:0 6px 20px rgba(27,20,16,.05)}
.section-tint .demo-cell{border-color:var(--rule-strong)}
.demo-cell .vid-box{position:relative;background:#000}
.demo-cell video{width:100%;aspect-ratio:16/10;object-fit:cover;background:#000;display:block}
.demo-cell.ours{border-color:var(--ember-soft2)}
.cell-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 12px;border-top:1px solid var(--rule)}
.cell-label{display:inline-flex;align-items:center;font-family:var(--font-mono);font-size:12.5px;font-weight:700;letter-spacing:.02em;color:var(--ink-soft)}
.cell-label.is-ours{color:var(--ember)}
.cell-right{display:flex;align-items:center;gap:8px}
.cell-speed{display:inline-flex;border:1px solid var(--rule-strong);border-radius:999px;overflow:hidden}
.cell-speed button{font-family:var(--font-mono);font-size:11px;border:0;background:none;color:var(--ink-soft);padding:5px 9px;cursor:pointer;transition:.15s}
.cell-speed button:hover{color:var(--ember)}
.cell-speed button.is-active{background:var(--ink);color:#fff}
.cell-expand{width:30px;height:28px;border:1px solid var(--rule-strong);background:#fff;border-radius:8px;cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--ink-soft);transition:.2s}
.cell-expand:hover{border-color:var(--ember);color:var(--ember)}
.cell-expand svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}

/* ============================================================
   RESULTS
   ============================================================ */
.chart-card{background:#fff;border:1px solid var(--rule);border-radius:18px;padding:24px 26px 22px;box-shadow:0 10px 36px rgba(27,20,16,.05)}
.chart-toolbar{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;margin-bottom:18px}
.chart-title{font-family:var(--font-display);font-weight:600;font-size:20px;margin:0;letter-spacing:-.01em}
.toolbar-segs{display:flex;flex-wrap:wrap;gap:12px}
.seg{display:inline-flex;border:1px solid var(--rule-strong);border-radius:999px;overflow:hidden;background:var(--bg-tint)}
.seg-btn,.metric-btn{font-family:var(--font-body);font-weight:600;font-size:13.5px;border:0;background:none;color:var(--ink-soft);padding:9px 16px;cursor:pointer;transition:.18s;white-space:nowrap}
.seg-btn:hover,.metric-btn:hover{color:var(--ember)}
.seg-btn.is-active,.metric-btn.is-active{background:var(--ember);color:#fff}
.seg-metric.is-hidden{opacity:.35;pointer-events:none}
#resultChart{width:100%;height:auto;display:block}
.chart-legend{display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:center;margin-top:8px}
.chart-legend .lg{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;color:var(--ink-soft);font-weight:500}
.chart-legend .sw{width:13px;height:13px;border-radius:3px}
.chart-note{font-size:13.5px;color:var(--muted-text);text-align:center;margin:10px 0 0}

.table-wrap{margin-top:46px;overflow-x:auto}
.results-table{width:100%;border-collapse:collapse;font-size:14.5px;min-width:760px}
.results-table th,.results-table td{padding:11px 9px;text-align:center;border-bottom:1px solid var(--rule)}
.results-table thead th{font-family:var(--font-display);font-weight:600;color:var(--ink);border-bottom:1px solid var(--rule-strong)}
.results-table thead .sub th{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;color:var(--muted-text);font-weight:400;text-transform:uppercase;padding-top:4px}
.results-table .left{text-align:left;font-weight:600;white-space:nowrap}
.results-table td.na{color:#c8bfb4}
.results-table tbody tr:hover{background:var(--bg-tint)}
.steam-row{background:var(--ember-soft)!important}
.steam-row td{border-bottom-color:var(--ember-soft2)}
.steam-row .left{color:var(--ember-dark)}
.steam-row b{color:var(--ink)}
.up{display:inline-block;font-family:var(--font-mono);font-style:normal;font-size:10.5px;font-weight:700;color:#0a8f3c;margin-left:5px;vertical-align:middle}
.table-cap{font-size:13px;color:var(--muted-text);margin:16px 0 0;line-height:1.5}

.ablation{margin-top:56px}
.abl-intro{font-size:16.5px;color:var(--ink-soft);margin:0 0 24px;max-width:none}
.abl-intro strong{color:var(--ink)}
.abl-note{font-size:13px;color:var(--muted-text);line-height:1.6;margin:14px 0 0}
.abl-note strong{font-family:var(--font-mono);font-weight:700;color:var(--ember-dark)}
.abl-note em{font-style:italic;color:var(--ink-soft)}
.abl-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:start}
.abl{background:#fff;border:1px solid var(--rule);border-radius:14px;padding:24px}
.abl h4{font-family:var(--font-display);font-weight:600;font-size:16.5px;margin:0 0 16px}
.abl h4 em{color:var(--ember);font-style:italic}
.mini-title{font-family:var(--font-display);font-weight:600;font-size:21px;margin:0 0 22px;letter-spacing:-.01em}
.mini-table{width:100%;border-collapse:collapse;font-size:14.5px}
.mini-table th{font-family:var(--font-mono);font-size:11.5px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted-text);font-weight:400;text-align:right;padding:6px 8px;border-bottom:1px solid var(--rule-strong)}
.mini-table th:first-child{text-align:left}
.mini-table td{padding:9px 8px;text-align:right;border-bottom:1px solid var(--rule)}
.mini-table td:first-child{text-align:left;font-family:var(--font-mono);font-size:13px}
.mini-table tr.best{background:var(--ember-soft)}
.mini-table tr.best td{font-weight:700;color:var(--ember-dark)}

/* ============================================================
   PAPER / ABSTRACT / BIBTEX
   ============================================================ */
.abstract{font-size:18px;line-height:1.72;color:var(--ink-soft);margin:0 0 44px}
.abstract strong{color:var(--ink)}
.bibtex{background:#fff;border:1px solid var(--rule);border-radius:14px;overflow:hidden}
.bibtex-head{display:flex;justify-content:space-between;align-items:center;padding:13px 18px;border-bottom:1px solid var(--rule);background:var(--bg-tint)}
.bibtex-head .eyebrow{margin:0}
.copy-btn{font-family:var(--font-body);font-weight:600;font-size:13px;border:1px solid var(--rule-strong);background:#fff;color:var(--ink-soft);border-radius:8px;padding:7px 14px;cursor:pointer;transition:.2s}
.copy-btn:hover{border-color:var(--ember);color:var(--ember)}
.copy-btn.copied{background:var(--ember);color:#fff;border-color:var(--ember)}
.bibtex pre{margin:0;padding:20px 18px;font-family:var(--font-mono);font-size:13px;line-height:1.65;color:var(--ink);white-space:pre-wrap;overflow-wrap:break-word}

/* ============================================================
   FOOTER + LIGHTBOX + TO-TOP
   ============================================================ */
.footer{background:var(--warm-dark);color:rgba(255,255,255,.7);padding:54px 0}
.foot-brand{color:#fff;font-size:22px;margin-bottom:14px}
.foot-brand .brand-curve path{stroke:#ff8a4c}
.foot-note{font-size:14px;line-height:1.7;margin:0;max-width:60ch}

.lightbox{position:fixed;inset:0;z-index:120;background:rgba(15,10,7,.92);display:none;align-items:center;justify-content:center;padding:40px;opacity:0;transition:opacity .25s}
.lightbox.is-open{display:flex;opacity:1}
.lb-stage{max-width:1000px;width:100%;text-align:center}
.lb-stage video{width:100%;max-height:82vh;border-radius:12px;background:#000}
.lb-cap{color:rgba(255,255,255,.82);font-family:var(--font-mono);font-size:13px;margin-top:14px;letter-spacing:.03em}
.lb-close{position:absolute;top:20px;right:26px;width:46px;height:46px;border-radius:50%;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.3);color:#fff;font-size:26px;line-height:1;cursor:pointer;transition:.2s}
.lb-close:hover{background:rgba(255,255,255,.24)}

.to-top{position:fixed;right:24px;bottom:24px;z-index:50;width:46px;height:46px;border-radius:50%;background:var(--ember);color:#fff;border:0;font-size:20px;cursor:pointer;opacity:0;transform:translateY(12px) scale(.9);pointer-events:none;transition:.3s var(--ease);box-shadow:0 8px 24px rgba(234,88,12,.4)}
.to-top.show{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{background:var(--ember-dark)}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media(max-width:880px){
  .steps{grid-template-columns:1fr}
}
@media(max-width:980px){
  .nav-links{gap:16px}
  .nav-links a{font-size:14px}
}
@media(max-width:900px){
  .section{padding:78px 0}
  .nav-links{position:fixed;top:var(--nav-h);left:0;right:0;flex-direction:column;gap:0;background:#fff;border-bottom:1px solid var(--rule);padding:8px 28px 18px;transform:translateY(-130%);transition:transform .3s var(--ease);box-shadow:0 14px 30px rgba(27,20,16,.1)}
  .nav-links.open{transform:none}
  .nav-links a{padding:13px 0;border-bottom:1px solid var(--rule);color:var(--ink-soft)!important;font-size:15px}
  .topbar:not(.scrolled){background:rgba(255,255,255,.82);backdrop-filter:blur(12px);border-bottom-color:var(--rule)}
  .topbar:not(.scrolled) .brand{color:var(--ink)}
  .topbar:not(.scrolled) .brand-curve path{stroke:var(--ember)}
  .topbar:not(.scrolled) .nav-toggle span{background:var(--ink)}
  .nav-toggle{display:block}
  .contrib-grid,.abl-grid{grid-template-columns:1fr;gap:16px}
  .adv-grid{grid-template-columns:1fr}
  .demo-grid.cols-3,.demo-grid.cols-2{grid-template-columns:1fr 1fr}
  .binfig{gap:18px}
}
@media(max-width:560px){
  body{font-size:16px}
  .hero-inner{padding:90px 22px 110px}
  .wrap{padding:0 20px}
  .demo-grid.cols-3,.demo-grid.cols-2{grid-template-columns:1fr}
  .chart-toolbar{flex-direction:column;align-items:stretch}
  .toolbar-segs{justify-content:center}
}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none;transition:none}
}