/* =================================================================
   BeyondCSe — project page
   Editorial layout, light/dark tokens, video-first demo section
   ================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400;1,500;1,600;1,700;1,800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ---- Tokens : LIGHT ---- */
:root{
  --bg:#ffffff;
  --bg-2:#f5f6f8;
  --surface:#ffffff;
  --surface-2:#fafbfc;
  --ink:#14171c;
  --ink-2:#464b54;
  --muted:#737a86;
  --faint:#a5abb6;
  --line:#e3e6eb;
  --line-2:#cbd0d8;
  --accent:#76b900;          /* NVIDIA green: fills, marks */
  --accent-d:#5f9a00;
  --accent-ink:#76b900;      /* same green as text in both themes */
  --accent-wash:rgba(118,185,0,0.12);
  --accent-mark:rgba(118,185,0,0.28);
  --on-accent:#0d1a00;       /* text on green fills */
  --event:#e0842a;           /* amber: "event history" highlights */
  --event-ink:#b5621a;
  --event-wash:rgba(224,132,42,0.13);
  --ok:#2a9d8f; --ok-ink:#1e7a6f;
  --bad:#c0392b;
  --cat-real:#76b900; --cat-sim:#7c3aed; --cat-occ:#b5621a; --cat-vis:#1e7a6f;
  --code-bg:#0d1117;
  --shadow:0 1px 2px rgba(0,0,0,0.05);
  --shadow-lg:0 18px 48px -28px rgba(20,30,10,0.45);
  --font-sans:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,monospace;
  --maxw:1180px;
  color-scheme:light;
}

/* ---- Tokens : DARK ---- */
:root[data-theme="dark"]{
  --bg:#0b0d11;
  --bg-2:#111419;
  --surface:#161a21;
  --surface-2:#1b2028;
  --ink:#f2f4f7;
  --ink-2:#c3c8d1;
  --muted:#8b929e;
  --faint:#646b77;
  --line:#272c35;
  --line-2:#3a404b;
  --accent:#76b900;
  --accent-d:#8ed100;
  --accent-ink:#76b900;
  --accent-wash:rgba(118,185,0,0.15);
  --accent-mark:rgba(133,200,20,0.30);
  --on-accent:#0d1a00;
  --event:#f0a052;
  --event-ink:#f5b675;
  --event-wash:rgba(240,160,82,0.16);
  --ok:#4fc7b7; --ok-ink:#6fd6c8;
  --bad:#f0716a;
  --cat-real:#76b900; --cat-sim:#b794ff; --cat-occ:#f5b675; --cat-vis:#6fd6c8;
  --code-bg:#070910;
  --shadow:0 1px 2px rgba(0,0,0,0.4);
  --shadow-lg:0 18px 48px -28px rgba(0,0,0,0.8);
  color-scheme:dark;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-sans);
  background:var(--bg);
  color:var(--ink);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background .4s ease,color .4s ease;
}
img,video{max-width:100%;}
a{color:inherit;}
::selection{background:var(--accent-mark);color:var(--ink);}

/* =================================================================
   Layout primitives
   ================================================================= */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(1rem,4vw,3rem);}
.section{padding:clamp(4rem,8vw,7rem) 0;border-top:1px solid var(--line);}
.section.bg{background:var(--bg-2);}

.kicker{
  display:flex;align-items:center;gap:.7rem;
  font-family:var(--font-mono);font-weight:600;font-size:.78rem;
  letter-spacing:.16em;text-transform:uppercase;color:var(--muted);
  margin-bottom:1.6rem;
}
.kicker .kn{color:var(--accent-ink);}
.kicker::after{content:"";flex:0 0 auto;width:34px;height:1px;background:var(--line-2);}
.sec-head{display:grid;grid-template-columns:1fr;gap:1.2rem;margin-bottom:clamp(2.4rem,5vw,3.6rem);}
@media(min-width:900px){
  .sec-head.split{grid-template-columns:1.35fr 1fr;align-items:start;gap:2.6rem;}
}
.sec-title{
  font-weight:800;font-size:clamp(1.9rem,4.4vw,3.2rem);line-height:1.06;
  letter-spacing:-0.03em;margin:0;text-wrap:balance;
}
.sec-title em{font-style:italic;color:var(--accent-ink);}
.sec-lede{font-size:clamp(1.02rem,1.5vw,1.2rem);color:var(--ink-2);line-height:1.55;margin:0;}
.sec-lede strong{color:var(--ink);font-weight:600;}

.mark{background:linear-gradient(180deg,transparent 58%,var(--accent-mark) 58%);font-weight:600;padding:0 1px;}
.ev{color:var(--event-ink);font-weight:700;}
code:not(pre code){font-family:var(--font-mono);font-size:.85em;background:var(--accent-wash);color:var(--accent-ink);padding:.08em .4em;border-radius:4px;}
.sc{font-variant:small-caps;letter-spacing:.04em;font-weight:600;}

/* =================================================================
   Theme toggle
   ================================================================= */
.theme-toggle{
  position:fixed;top:1.1rem;right:1.1rem;z-index:90;
  display:inline-flex;align-items:center;gap:.5rem;
  background:var(--surface);border:1px solid var(--line);color:var(--ink);
  border-radius:999px;padding:.5rem .6rem;cursor:pointer;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;
  box-shadow:var(--shadow);transition:border-color .2s,transform .15s,background .4s;
}
.theme-toggle:hover{border-color:var(--accent);transform:translateY(-1px);}
.theme-toggle .ico{width:18px;height:18px;display:grid;place-items:center;color:var(--accent-ink);}
.theme-toggle .lbl{padding-right:.25rem;}
@media(max-width:600px){.theme-toggle .lbl{display:none;}}

/* =================================================================
   HERO
   ================================================================= */
.hero{position:relative;padding:clamp(1.8rem,3.5vw,3.2rem) 0 clamp(2.6rem,5vw,4rem);overflow:hidden;}
.hero::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(900px 520px at 88% -8%,var(--accent-wash),transparent 60%),
    radial-gradient(600px 400px at -5% 30%,var(--event-wash),transparent 65%);
}
.hero .wrap{position:relative;z-index:1;}
.hero-top{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:clamp(2.2rem,5vw,3.6rem);}
.hero-brand{display:flex;align-items:center;gap:.6rem;font-weight:700;letter-spacing:-0.01em;}
.hero-brand .logo{width:34px;height:34px;}
.hero-meta{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);text-align:right;}

.hero-eyebrow{
  font-family:var(--font-mono);font-weight:600;font-size:.8rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--accent-ink);margin-bottom:1.4rem;
  display:flex;align-items:center;gap:.7rem;
}
.hero-eyebrow::before{content:"";width:30px;height:2px;background:var(--accent);}
.hero-title{
  font-weight:800;font-size:clamp(2.8rem,8vw,6rem);line-height:0.95;
  letter-spacing:-0.045em;margin:0 0 1.4rem;
}
.hero-title .nm{color:var(--accent-ink);}
.hero-title .nm small{font-size:.5em;font-weight:600;letter-spacing:-0.02em;color:var(--muted);vertical-align:.35em;margin-left:.15em;}
.hero-title .rest{display:block;color:var(--ink);font-size:clamp(1.35rem,3.6vw,2.6rem);line-height:1.08;letter-spacing:-0.03em;margin-top:.7rem;font-weight:700;}
.hero-thesis{font-size:clamp(1.08rem,1.8vw,1.4rem);line-height:1.5;color:var(--ink-2);margin:1.4rem 0 0;}
.hero-thesis strong{color:var(--ink);font-weight:600;}

.hero-grid{display:grid;grid-template-columns:1fr;gap:clamp(1.6rem,3vw,2.6rem);margin-top:clamp(1rem,2.4vw,1.8rem);}
@media(min-width:960px){.hero-grid{grid-template-columns:minmax(0,1fr) 480px;align-items:start;}}
.hero-left{min-width:0;}

/* authors */
.authors{margin:1.6rem 0 0;font-size:1rem;color:var(--ink-2);line-height:1.9;}
.authors a{color:var(--ink);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .2s;}
.authors a:hover{border-color:var(--accent);}
.authors sup{color:var(--accent-ink);font-weight:700;}
.affil-note{font-size:.86rem;color:var(--muted);margin:.2rem 0 0;max-width:60ch;}

/* link buttons */
.links{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.6rem;}
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  background:var(--ink);color:var(--bg);border:1px solid var(--ink);
  padding:.62rem 1.15rem;border-radius:999px;text-decoration:none;
  font-weight:500;font-size:.95rem;transition:all .18s ease;cursor:pointer;
}
.btn:hover{background:var(--accent);border-color:var(--accent);color:var(--on-accent);transform:translateY(-1px);}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line-2);}
.btn.ghost:hover{background:transparent;border-color:var(--accent);color:var(--accent-ink);transform:translateY(-1px);}
.btn[aria-disabled="true"]{opacity:.5;pointer-events:none;}
.btn .i{font-size:.95em;color:inherit;}

/* hero video + stats */
.hero-right{display:flex;flex-direction:column;gap:1rem;}
@media(min-width:960px){.hero-right{margin-top:calc(2.4rem + clamp(.4rem,1.2vw,1rem));}}
.hero-video{
  position:relative;border-radius:14px;overflow:hidden;background:#000;
  border:1px solid var(--line);box-shadow:var(--shadow-lg);aspect-ratio:16/9;
}
.hero-video video{display:block;width:100%;height:100%;object-fit:cover;}
.hero-video .tag{
  position:absolute;right:.8rem;top:.8rem;
  display:inline-flex;align-items:center;gap:.45rem;
  background:rgba(0,0,0,.55);color:#fff;backdrop-filter:blur(6px);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;
  padding:.32rem .6rem;border-radius:999px;
}
.hero-video .tag .dot{width:7px;height:7px;border-radius:50%;background:#ff4d4d;box-shadow:0 0 0 3px rgba(255,77,77,.3);}
.hero-cap{font-size:.92rem;color:var(--ink-2);line-height:1.5;margin:1rem 0 0;padding:0 .2rem;}
.hero-cap .q{display:block;color:var(--ink);font-weight:600;}
.hero-cap .d{display:block;margin-top:.15rem;color:var(--muted);}
.hero-cap b{color:var(--event-ink);}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--surface);}
.hstat{padding:1rem .95rem;border-right:1px solid var(--line);}
.hstat:last-child{border-right:none;}
.hstat .v{font-weight:800;font-size:clamp(1.5rem,2.6vw,2rem);line-height:1;color:var(--accent-ink);letter-spacing:-0.03em;font-variant-numeric:tabular-nums;}
.hstat .v small{font-size:.5em;font-weight:600;color:var(--muted);margin-left:.1em;}
.hstat .l{font-size:.82rem;color:var(--ink-2);line-height:1.35;margin-top:.4rem;}
.hstat .l b{color:var(--ink);font-weight:600;}
@media(max-width:420px){.hero-stats{grid-template-columns:1fr;}.hstat{border-right:none;border-bottom:1px solid var(--line);}.hstat:last-child{border-bottom:none;}}

/* =================================================================
   Lede / thesis band
   ================================================================= */
.lede-band{padding:clamp(3rem,6vw,5rem) 0;}
.lede-statement{
  font-weight:800;font-size:clamp(1.6rem,3.4vw,2.7rem);line-height:1.18;
  letter-spacing:-0.025em;max-width:22ch;margin:0;
}
.lede-statement .g{color:var(--accent-ink);}
.lede-body{font-size:clamp(1.02rem,1.5vw,1.2rem);color:var(--ink-2);line-height:1.65;margin:0;}
.lede-body strong{color:var(--ink);font-weight:600;}
.lede-grid{display:grid;grid-template-columns:1fr;gap:2rem;}
@media(min-width:900px){.lede-grid{grid-template-columns:1fr 1fr;gap:clamp(2.5rem,6vw,5rem);align-items:start;}}
.lede-quote{
  margin:1.4rem 0 0;padding:1rem 1.2rem;border-left:3px solid var(--event);
  background:var(--event-wash);border-radius:0 10px 10px 0;
  font-size:1.05rem;color:var(--ink);font-style:italic;
}
.lede-quote b{font-style:normal;color:var(--event-ink);}

/* =================================================================
   Figures
   ================================================================= */
.figure{background:#ffffff;border:1px solid var(--line);border-radius:12px;padding:clamp(.8rem,2vw,1.4rem);}
.figure img{display:block;margin:0 auto;border-radius:4px;}
.figure.plain{background:transparent;border:none;padding:0;}
.figure.lit{background:#ffffff;}
.figcap{font-size:.92rem;color:var(--muted);line-height:1.5;margin:1rem 0 0;}
.figcap strong{color:var(--ink);font-weight:600;}

/* comparison cards */
.iface-grid{display:grid;grid-template-columns:1fr;gap:1rem;margin-top:2.4rem;}
@media(min-width:760px){.iface-grid{grid-template-columns:repeat(3,1fr);}}
.iface{border:1px solid var(--line);border-radius:10px;padding:1.5rem;background:var(--surface);position:relative;transition:border-color .2s;}
.iface .tag{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:.7rem;}
.iface h3{font-weight:700;font-size:1.12rem;margin:0 0 .5rem;letter-spacing:-0.01em;}
.iface p{margin:0;font-size:.96rem;color:var(--ink-2);line-height:1.55;}
.iface.ours{border-color:var(--accent);background:linear-gradient(180deg,var(--accent-wash),transparent);}
.iface.ours .tag{color:var(--accent-ink);}
.iface.ours::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent);border-radius:10px 0 0 10px;}

/* =================================================================
   Supplementary video
   ================================================================= */
.suppl-frame{
  background:var(--surface);border:1px solid var(--line);border-radius:14px;
  overflow:hidden;box-shadow:var(--shadow-lg);
}
.suppl-bar{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.6rem .8rem .6rem 1.1rem;border-bottom:1px solid var(--line);background:var(--surface-2);
}
.suppl-eyebrow{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);}
.suppl-eyebrow .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--accent-wash);}
.suppl-act{
  display:inline-flex;align-items:center;gap:.42rem;font-size:.8rem;font-weight:500;color:var(--ink-2);
  background:transparent;border:1px solid var(--line-2);border-radius:999px;padding:.36rem .8rem;text-decoration:none;transition:all .18s;
}
.suppl-act:hover{border-color:var(--accent);color:var(--accent-ink);}
.suppl-stage{position:relative;aspect-ratio:16/9;background:#000;}
.suppl-stage video{position:absolute;inset:0;width:100%;height:100%;display:block;}
.chapters{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.1rem;}
.chapter{
  display:inline-flex;align-items:center;gap:.5rem;font-size:.85rem;color:var(--ink-2);
  border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:.35rem .8rem .35rem .55rem;cursor:pointer;transition:all .18s;
}
.chapter:hover{border-color:var(--accent);color:var(--accent-ink);}
.chapter .t{font-family:var(--font-mono);font-size:.72rem;color:var(--accent-ink);background:var(--accent-wash);border-radius:999px;padding:.1rem .45rem;}

/* =================================================================
   Method
   ================================================================= */
.method-block{margin-top:clamp(2.6rem,5vw,4rem);}
.method-head{display:flex;align-items:baseline;gap:.9rem;flex-wrap:wrap;margin-bottom:1rem;}
.method-n{font-family:var(--font-mono);font-weight:700;font-size:.85rem;letter-spacing:.08em;color:var(--accent-ink);}
.method-title{font-weight:700;font-size:clamp(1.25rem,2.2vw,1.65rem);line-height:1.25;letter-spacing:-0.015em;margin:0;}
.method-title em{font-style:italic;color:var(--accent-ink);}
.method-cols{display:grid;grid-template-columns:1fr;gap:2rem;align-items:start;margin-top:1rem;}
@media(min-width:900px){.method-cols{grid-template-columns:1.05fr .95fr;}.method-cols.rev{grid-template-columns:.95fr 1.05fr;}}
.method-cols p{font-size:1.02rem;color:var(--ink-2);line-height:1.65;margin:.8rem 0 0;}
.method-cols p strong{color:var(--ink);font-weight:600;}

.prim-grid{display:grid;grid-template-columns:1fr;gap:0;margin-top:1.6rem;border-top:1px solid var(--line);}
@media(min-width:640px){.prim-grid{grid-template-columns:1fr 1fr;}}
@media(min-width:980px){.prim-grid.c4{grid-template-columns:repeat(4,1fr);}}
.prim{padding:1.3rem 1.3rem 1.3rem 0;border-bottom:1px solid var(--line);position:relative;}
@media(min-width:640px){.prim{padding-right:1.4rem;}.prim:nth-child(even){padding-left:1.4rem;border-left:1px solid var(--line);}}
@media(min-width:980px){
  .prim-grid.c4 .prim{padding-left:1.4rem;border-left:1px solid var(--line);}
  .prim-grid.c4 .prim:nth-child(4n+1){padding-left:0;border-left:none;}
}
.prim .pn{font-family:var(--font-mono);font-size:.78rem;color:var(--accent-ink);font-weight:600;}
.prim h4{font-weight:700;font-size:1.05rem;margin:.5rem 0 .4rem;letter-spacing:-0.01em;}
.prim p{margin:0;font-size:.93rem;color:var(--ink-2);line-height:1.55;}

.eqbox{
  margin-top:1.4rem;border:1px solid var(--line);border-radius:12px;background:var(--surface);
  padding:1.1rem 1.3rem;overflow-x:auto;
}
.eqbox .eq{font-size:1.05rem;margin:.2rem 0 .6rem;}
.eqbox .eqnote{font-size:.9rem;color:var(--muted);line-height:1.55;margin:0;}
.eqbox .eqnote b{color:var(--ink-2);font-weight:600;}

.takeaway{margin-top:clamp(2.4rem,5vw,3.4rem);border:1px solid var(--accent);border-radius:12px;padding:clamp(1.6rem,3vw,2.4rem);background:linear-gradient(135deg,var(--accent-wash),transparent);}
.takeaway .lab{font-family:var(--font-mono);font-weight:600;font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-ink);margin-bottom:.7rem;}
.takeaway p{font-size:clamp(1.08rem,1.8vw,1.35rem);line-height:1.45;margin:0;color:var(--ink);font-weight:500;letter-spacing:-0.01em;}
.takeaway p strong{font-weight:700;}

/* =================================================================
   Demos
   ================================================================= */
.demo-tabs{display:inline-flex;gap:.3rem;padding:.3rem;border:1px solid var(--line);border-radius:999px;background:var(--surface);margin-bottom:2rem;}
.demo-tab{
  display:inline-flex;align-items:center;gap:.5rem;border:none;background:transparent;color:var(--ink-2);
  font-family:var(--font-sans);font-weight:600;font-size:.92rem;padding:.55rem 1.1rem;border-radius:999px;cursor:pointer;transition:all .18s;
}
.demo-tab .n{font-family:var(--font-mono);font-size:.72rem;color:var(--muted);}
.demo-tab:hover{color:var(--ink);}
.demo-tab.active{background:var(--ink);color:var(--bg);}
.demo-tab.active .n{color:var(--bg);opacity:.7;}
.demo-panel{display:none;}
.demo-panel.active{display:block;animation:fadeUp .4s cubic-bezier(.2,.6,.2,1) both;}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:none;}}

.case{border:1px solid var(--line);border-radius:14px;background:var(--surface);padding:clamp(1.1rem,2.4vw,1.8rem);margin-top:1.4rem;}
.case:first-child{margin-top:0;}
.case-head{display:grid;grid-template-columns:1fr;gap:.6rem 2rem;margin-bottom:1.2rem;}
@media(min-width:900px){.case-head{grid-template-columns:1fr 1.2fr;align-items:start;}}
.case-head h3{margin:.4rem 0 0;font-weight:700;font-size:clamp(1.15rem,2vw,1.45rem);letter-spacing:-0.015em;line-height:1.25;}
.case-head p{margin:0;font-size:.95rem;color:var(--ink-2);line-height:1.55;}
.pill{font-family:var(--font-mono);font-weight:600;font-size:.66rem;letter-spacing:.05em;text-transform:uppercase;padding:.2rem .6rem;border-radius:999px;display:inline-block;}
.pill.occ{background:var(--event-wash);color:var(--cat-occ);}
.pill.vis{background:rgba(42,157,143,.14);color:var(--cat-vis);}
.pill.sim{background:rgba(124,58,237,.12);color:var(--cat-sim);}
.pill.real{background:var(--accent-wash);color:var(--cat-real);}

.case-grid{display:grid;grid-template-columns:1fr;gap:1rem;}
@media(min-width:820px){.case-grid{grid-template-columns:1fr 1fr;}}
.vid{margin:0;min-width:0;}
.vid-label{
  display:flex;align-items:center;justify-content:space-between;gap:.6rem;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:.5rem;
}
.vid-label .who{display:inline-flex;align-items:center;gap:.45rem;}
.vid-label .who::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--faint);}
.vid-label.hist .who::before{background:var(--event);}
.vid-label.exec .who::before{background:var(--accent);}
.vid-label .speed{color:var(--faint);}
.vid-box{position:relative;border-radius:10px;overflow:hidden;background:#000;border:1px solid var(--line);aspect-ratio:16/9;}
.vid-box video{position:absolute;inset:0;width:100%;height:100%;display:block;object-fit:cover;}
.vid-box .sub{
  position:absolute;left:3.4rem;top:.7rem;right:.7rem;pointer-events:none;
  display:flex;justify-content:flex-end;
}
.vid-box .sub span{
  background:rgba(0,0,0,.6);color:#fff;backdrop-filter:blur(6px);
  font-size:.82rem;padding:.3rem .65rem;border-radius:8px;line-height:1.35;max-width:100%;
}
.vid-box .sub b{color:#ffd28a;}
.vid-box.done::after{content:"";}
.chips{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.8rem;}
.chip{
  display:inline-flex;align-items:center;gap:.5rem;
  border:1px solid var(--line-2);background:transparent;color:var(--ink-2);
  font-family:var(--font-sans);font-size:.88rem;padding:.42rem .9rem;border-radius:999px;cursor:pointer;transition:all .18s;
}
.chip .k{font-family:var(--font-mono);font-size:.68rem;color:var(--muted);letter-spacing:.06em;}
.chip b{color:var(--ink);font-weight:600;}
.chip:hover{border-color:var(--accent);color:var(--accent-ink);}
.chip.active{background:var(--accent);border-color:var(--accent);color:var(--on-accent);}
.chip.active b,.chip.active .k{color:var(--on-accent);}
.chip-hint{font-size:.82rem;color:var(--muted);margin:.5rem 0 0;}

.sim-compare{display:grid;grid-template-columns:repeat(3,1fr);gap:.6rem;margin-top:.7rem;}
.sim-compare .cmp{font-size:.8rem;text-align:center;color:var(--ink-2);padding:.4rem .5rem;border:1px solid var(--line);border-radius:8px;background:var(--surface-2);}
.sim-compare .cmp.ours{border-color:var(--accent);color:var(--accent-ink);font-weight:600;background:var(--accent-wash);}
.sim-compare .cmp small{display:block;color:var(--muted);font-weight:400;font-size:.72rem;}

/* =================================================================
   Results
   ================================================================= */
.checks{list-style:none;padding:0;margin:0 0 1.4rem;display:flex;flex-direction:column;gap:.7rem;}
.checks li{display:flex;gap:.7rem;align-items:baseline;font-size:1.02rem;color:var(--ink);line-height:1.45;}
.checks .ck{color:var(--accent);font-weight:700;flex:0 0 auto;}
.checks b{color:var(--accent-ink);font-weight:700;}
.results-checks{flex-direction:row;flex-wrap:wrap;gap:.8rem 2.2rem;margin-bottom:clamp(2.4rem,5vw,3.4rem);}

.tbl-title{font-weight:700;font-size:1.15rem;letter-spacing:-0.01em;margin:0 0 .4rem;display:flex;align-items:center;gap:.6rem;}
.tbl-title .i{color:var(--accent-ink);font-size:.95em;}
.tbl-note{color:var(--muted);font-size:.93rem;line-height:1.55;margin:0 0 1.1rem;}
.tbl-note strong{color:var(--ink-2);font-weight:600;}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;}
table.tbl{width:100%;border-collapse:collapse;font-size:.93rem;background:var(--surface);}
table.tbl th,table.tbl td{padding:.7rem .95rem;text-align:center;border-bottom:1px solid var(--line);white-space:nowrap;}
table.tbl thead th{background:var(--bg-2);font-weight:600;color:var(--ink);font-size:.86rem;letter-spacing:.01em;}
table.tbl th.l,table.tbl td.l{text-align:left;}
table.tbl tbody tr:last-child td{border-bottom:none;}
table.tbl td.num{font-variant-numeric:tabular-nums;font-family:var(--font-mono);font-size:.88rem;}
table.tbl tr.ours td{background:var(--accent-wash);font-weight:600;}
table.tbl tr.base td{color:var(--muted);}
.pos{color:var(--accent-ink);font-weight:700;}
.neg{color:var(--bad);font-weight:600;}
.tbl-foot{font-size:.85rem;color:var(--muted);margin:.8rem 0 0;line-height:1.5;}
.tbl-foot strong{color:var(--ink-2);}
.two-tbl{display:grid;grid-template-columns:1fr;gap:2.4rem;margin-top:3rem;}
.two-tbl>div{min-width:0;}
@media(min-width:1100px){.two-tbl{grid-template-columns:.9fr 1.1fr;gap:2.6rem;align-items:start;}}
table.tbl.compact th,table.tbl.compact td{padding:.6rem .55rem;font-size:.86rem;}
table.tbl.compact td.num{font-size:.82rem;}

/* findings accordion */
details.finding{border-top:1px solid var(--line);padding:0;}
details.finding:last-of-type{border-bottom:1px solid var(--line);}
summary.finding-head{
  display:flex;align-items:flex-start;gap:1rem .9rem;margin:0;padding:clamp(1.2rem,3vw,1.7rem) 0;
  list-style:none;cursor:pointer;user-select:none;-webkit-tap-highlight-color:transparent;
}
summary.finding-head::-webkit-details-marker{display:none;}
summary.finding-head::marker{content:"";}
.finding-n{font-family:var(--font-mono);font-weight:700;font-size:.82rem;letter-spacing:.08em;color:var(--accent-ink);flex:0 0 auto;padding-top:.34em;}
.finding-title{flex:1 1 auto;font-weight:600;font-size:clamp(1.1rem,2vw,1.45rem);line-height:1.3;letter-spacing:-0.015em;margin:0;transition:color .2s;}
.finding-title em{font-style:italic;color:var(--accent-ink);}
summary.finding-head:hover .finding-title,details.finding[open]>summary.finding-head .finding-title{color:var(--accent-ink);}
summary.finding-head::after{
  content:"\f078";font-family:"Font Awesome 5 Free";font-weight:900;
  flex:0 0 auto;margin-left:auto;align-self:center;display:grid;place-items:center;
  width:2.1rem;height:2.1rem;border-radius:50%;border:1px solid var(--line-2);font-size:.72rem;color:var(--muted);
  transition:transform .35s cubic-bezier(.4,0,.2,1),color .2s,background .2s,border-color .2s;
}
summary.finding-head:hover::after{color:var(--accent-ink);border-color:var(--accent);background:var(--accent-wash);}
details.finding[open]>summary.finding-head::after{transform:rotate(180deg);color:var(--on-accent);background:var(--accent);border-color:var(--accent);}
.finding-body{padding-bottom:clamp(1.6rem,3.4vw,2.4rem);}
details.finding[open] .finding-body{animation:fadeUp .42s cubic-bezier(.2,.6,.2,1) both;}
.finding p{font-size:1.02rem;color:var(--ink-2);line-height:1.65;margin:.6rem 0 0;}
.finding p strong{color:var(--ink);font-weight:600;}
.finding ul{margin:.8rem 0 0;padding-left:1.3rem;color:var(--ink-2);font-size:1rem;line-height:1.6;}
.finding ul strong{color:var(--ink);}
.finding-cols{display:grid;grid-template-columns:1fr;gap:2rem;align-items:start;margin-top:.4rem;}
@media(min-width:840px){.finding-cols.v{grid-template-columns:.8fr 1.2fr;}.finding-cols.w{grid-template-columns:1.2fr .8fr;}}

/* =================================================================
   References
   ================================================================= */
.refs-grid{display:grid;grid-template-columns:1fr;gap:2.2rem;margin-top:1rem;}
@media(min-width:780px){.refs-grid{grid-template-columns:repeat(3,1fr);align-items:start;}}
.refs-h{font-family:var(--font-mono);font-weight:600;font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-ink);margin:0 0 1rem;padding-bottom:.6rem;border-bottom:1px solid var(--line);}
.refs-list{list-style:none;padding:0;margin:0;}
.refs-list li{padding:.85rem 0;border-bottom:1px solid var(--line);font-size:.93rem;line-height:1.5;}
.refs-list li:last-child{border-bottom:none;}
.refs-name{font-weight:600;color:var(--ink);}
.refs-meta{color:var(--ink-2);display:block;margin-top:.15rem;}
.refs-meta em{color:var(--muted);}
.refs-links{font-size:.85em;margin-top:.3rem;display:block;}
.refs-links a{color:var(--accent-ink);text-decoration:none;border-bottom:1px dotted var(--accent-wash);}
.refs-links a:hover{color:var(--accent);}

/* =================================================================
   BibTeX
   ================================================================= */
.bibtex{position:relative;background:var(--code-bg);color:#cdd6e0;border-radius:12px;padding:1.6rem;font-family:var(--font-mono);font-size:.86rem;line-height:1.6;overflow-x:auto;margin-top:1.6rem;border:1px solid var(--line);}
.bibtex pre{margin:0;background:none;color:inherit;}
.copy-btn{position:absolute;top:.8rem;right:.8rem;background:rgba(255,255,255,.07);color:#cdd6e0;border:1px solid rgba(255,255,255,.16);border-radius:6px;padding:.35rem .75rem;font-size:.78rem;cursor:pointer;font-family:var(--font-mono);transition:all .2s;}
.copy-btn:hover{background:var(--accent);color:var(--on-accent);border-color:var(--accent);}

/* =================================================================
   Footer
   ================================================================= */
footer{border-top:1px solid var(--line);padding:3rem 0;color:var(--muted);font-size:.9rem;}
footer .wrap{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;align-items:center;}
footer a{color:var(--accent-ink);text-decoration:none;}
footer a:hover{color:var(--accent);}
footer .brand{display:inline-flex;align-items:center;gap:.5rem;font-weight:700;color:var(--ink);}
footer .brand .logo{width:26px;height:26px;}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;}
  html{scroll-behavior:auto;}
}

/* ---- overflow guards: grid children must be allowed to shrink ---- */
.hero-grid>*,.lede-grid>*,.method-cols>*,.case-grid>*,.finding-cols>*,.refs-grid>*,.two-tbl>*{min-width:0;}
.eqbox{min-width:0;}
.katex-display{overflow-x:auto;overflow-y:hidden;margin:.4rem 0;padding:.2rem 0;}
.katex-display>.katex{white-space:nowrap;}
.demo-tabs{max-width:100%;flex-wrap:wrap;}
@media(max-width:480px){.demo-tab .n{display:none;}.demo-tab{padding:.5rem .9rem;}}

@media(max-width:600px){.hero-meta{display:none;}}
.chapter{white-space:nowrap;}
@media(max-width:480px){.chapter{white-space:normal;}}

/* ---- Hero v2: full-width title, media below ---- */
.hero-head{max-width:980px;}
.hero-head .authors{margin-top:1.4rem;max-width:none;}
.hero-media{display:grid;grid-template-columns:1fr;gap:clamp(1.4rem,3vw,2.4rem);margin-top:clamp(2.2rem,4vw,3.2rem);align-items:start;}
@media(min-width:960px){.hero-media{grid-template-columns:minmax(0,1.6fr) minmax(300px,1fr);}}
.hero-media>*{min-width:0;}
.hero-side{display:flex;flex-direction:column;gap:1.2rem;}
.hero-side .hero-thesis{margin:0;max-width:none;font-size:clamp(1rem,1.4vw,1.15rem);}
.hero-stats.v{grid-template-columns:1fr;}
.hero-stats.v .hstat{border-right:none;border-bottom:1px solid var(--line);display:flex;align-items:baseline;gap:.9rem;padding:.85rem 1rem;}
.hero-stats.v .hstat:last-child{border-bottom:none;}
.hero-stats.v .hstat .v{flex:0 0 4.2ch;}
.hero-stats.v .hstat .l{margin-top:0;}
.method-lede{font-size:1.02rem;color:var(--ink-2);line-height:1.6;margin:1.2rem 0 0;}
.prim-grid.c2{grid-template-columns:1fr 1fr;margin-top:1.4rem;}
.prim-grid.c2 .prim{padding:1rem 1rem 1rem 0;}
.prim-grid.c2 .prim:nth-child(even){padding-left:1rem;border-left:1px solid var(--line);}
@media(max-width:480px){.prim-grid.c2{grid-template-columns:1fr;}.prim-grid.c2 .prim:nth-child(even){padding-left:0;border-left:none;}}
.authors span{color:var(--ink);}
/* title: one line on desktop */
.hero-title{font-size:clamp(2.2rem,6.4vw,4.8rem);line-height:1.02;}
.hero-title .rest{font-size:clamp(1.2rem,2.6vw,1.9rem);margin-top:.55rem;}


/* hero top: fixed top padding so the meta label sits below the theme toggle and stays right-aligned */
.hero{padding-top:3.6rem;}
.hero-title .rest{font-size:clamp(1.45rem,3.2vw,2.35rem);margin-top:.6rem;}
/* affiliations with logos */
.affils{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem 1.8rem;margin-top:.7rem;font-size:.92rem;color:var(--ink-2);}
.affil{display:inline-flex;align-items:center;gap:.55rem;}
.affil sup{color:var(--accent-ink);font-weight:700;margin-right:.1rem;}
.affil-logo{display:block;width:auto;}
.affil-logo.snu{height:40px;}
.affil-logo.nv{height:22px;}
.affil-logo.nv-dark{display:none;}
:root[data-theme="dark"] .affil-logo.nv-light{display:none;}
:root[data-theme="dark"] .affil-logo.nv-dark{display:block;}
.affil-logo.snu-dark{display:none;}
:root[data-theme="dark"] .affil-logo.snu-light{display:none;}
:root[data-theme="dark"] .affil-logo.snu-dark{display:block;}

/* top-align every two-column block: text starts on the same line as the heading */
.sec-head.split,.lede-grid,.case-head,.method-cols,.finding-cols,.hero-media{align-items:start;}
.sec-head.split .sec-lede,.lede-grid .lede-body:first-child{margin-top:.35em;}
.case-head p{margin-top:.2rem;}
.finding-cols>div>p:first-child{margin-top:0;}
.hero-top{justify-content:space-between;margin-bottom:clamp(1.2rem,3vw,2rem);}
.affil.eq{color:var(--muted);font-size:.86rem;}
.affil.eq sup{margin-right:.15rem;}
/* case header: pill + title on the left, description on the right, both bottom-aligned */
@media(min-width:900px){.case-head{align-items:end;}.case-head p{margin-top:0;margin-bottom:.15rem;}}
/* affiliation markers in text color rather than accent */
.authors sup,.affil sup,.affil.eq sup{color:var(--ink);font-weight:600;}
.eq-note{margin:.35rem 0 0;font-size:.86rem;color:var(--muted);}
.eq-note sup{color:var(--ink);font-weight:600;margin-right:.15rem;}
.affils{margin-top:.55rem;}

/* hero demo reel */
.hero-nav{
  position:absolute;top:50%;transform:translateY(-50%);z-index:2;
  width:2.4rem;height:2.4rem;border-radius:50%;border:1px solid rgba(255,255,255,.25);
  background:rgba(0,0,0,.45);color:#fff;backdrop-filter:blur(6px);cursor:pointer;
  display:grid;place-items:center;font-size:.8rem;opacity:0;transition:opacity .2s,background .2s,border-color .2s;
}
.hero-nav.prev{left:.7rem;}.hero-nav.next{right:.7rem;}
.hero-video:hover .hero-nav,.hero-nav:focus-visible{opacity:1;}
.hero-nav:hover{background:var(--accent);border-color:var(--accent);color:var(--on-accent);}
@media(hover:none){.hero-nav{opacity:1;}}
.hero-dots{position:absolute;right:.9rem;bottom:.7rem;display:flex;justify-content:flex-end;gap:.35rem;z-index:2;pointer-events:none;background:rgba(0,0,0,.35);padding:.3rem .45rem;border-radius:999px;backdrop-filter:blur(6px);}
.hero-dots span{width:6px;height:6px;border-radius:50%;background:rgba(255,255,255,.4);transition:background .2s,width .2s;}
.hero-dots span.on{background:var(--accent);width:18px;border-radius:3px;}
.hero-cap .n{font-family:var(--font-mono);font-size:.72rem;color:var(--accent-ink);margin-right:.5rem;}

/* simulation card: small history clip, large baseline comparison (letterbox bars cropped) */
@media(min-width:820px){.case.sim .case-grid{grid-template-columns:1fr 1.8fr;align-items:start;}}
.vid-box.wide{aspect-ratio:1920/709;}
.vid-box.wide video{object-fit:cover;object-position:center;}
/* case header: stack pill + title above the description at every width */
.case-head{display:block;}
.case-head h3{margin:.45rem 0 0;}
.case-head p{margin:.6rem 0 0;max-width:none;}
@media(min-width:900px){.case-head{grid-template-columns:1fr;align-items:start;}.case-head p{margin-top:.6rem;margin-bottom:0;}}
/* 01 The idea: statement above, body below */
.lede-grid{display:block;}
@media(min-width:900px){.lede-grid{grid-template-columns:1fr;}}
.lede-statement{max-width:none;}
.lede-body{margin-top:1.4rem;}
.lede-grid .lede-body:first-child{margin-top:0;}
.lede-quote{max-width:none;}
.lede-statement{margin-bottom:clamp(1.6rem,3vw,2.4rem);}
/* Results header: title and lede share the same baseline */
@media(min-width:900px){#results .sec-head.split{align-items:end;}#results .sec-head.split .sec-lede{margin-top:0;margin-bottom:.3em;}}
/* brand wordmark: bold green */
.hero-brand span,footer .brand{color:var(--accent-ink);font-weight:800;letter-spacing:-0.02em;}

/* all split section headers: title and lede share the bottom baseline */
@media(min-width:900px){.sec-head.split{align-items:end;}.sec-head.split .sec-lede{margin-top:0;margin-bottom:.3em;}}
/* captions inside white figure panels stay dark in both themes */
.figure.lit .figcap{color:#555b64;}
.figure.lit .figcap strong,.figure.lit .figcap .sc{color:#1c1f24;}
.brand-name{color:var(--accent-ink);font-weight:700;}
/* Method header: top-aligned (its lede is longer than the title) */
@media(min-width:900px){#method .sec-head.split{align-items:start;}#method .sec-head.split .sec-lede{margin-top:.35em;margin-bottom:0;}}

/* =================================================================
   Scroll polish
   ================================================================= */
.scroll-progress{
  position:fixed;left:0;top:0;height:3px;width:100%;z-index:100;pointer-events:none;
  background:linear-gradient(90deg,var(--accent),var(--accent-d));
  transform-origin:0 50%;transform:scaleX(0);
  box-shadow:0 0 12px var(--accent-wash);
}
.reveal{opacity:0;transform:translateY(22px);
  transition:opacity .75s cubic-bezier(.2,.6,.2,1) var(--d,0ms),transform .75s cubic-bezier(.2,.6,.2,1) var(--d,0ms);
  will-change:opacity,transform;}
.reveal.in{opacity:1;transform:none;}
/* the figure frames get a soft lift as they land */
.figure.reveal{transform:translateY(22px) scale(.985);}
.figure.reveal.in{transform:none;}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none;}.scroll-progress{display:none;}}
/* hide the native page scrollbar; the top progress bar shows position instead (scrolling still works) */
html{scrollbar-width:none;-ms-overflow-style:none;}
html::-webkit-scrollbar{display:none;}

/* =================================================================
   Feedback round: stacked section headers, side nav, hero chart, modules
   ================================================================= */
/* section header: lede sits under the title, never beside it */
.sec-head,.sec-head.split{grid-template-columns:1fr !important;align-items:start !important;gap:1rem;}
.sec-head .sec-lede,.sec-head.split .sec-lede{margin:0 !important;max-width:none;}
.sec-head .lede-quote{margin-top:.4rem;}

/* hero caption: instruction in a prominent box */
.hero-cap{margin-top:.9rem;padding:0;}
.hero-cap .q{display:flex;align-items:baseline;gap:.6rem;flex-wrap:wrap;font-size:clamp(1.05rem,1.5vw,1.25rem);font-weight:700;color:var(--ink);
  border:1px solid var(--line);border-left:4px solid var(--accent);background:var(--surface);border-radius:10px;padding:.7rem .95rem;}
.hero-cap .q .n{font-size:.72rem;color:var(--muted);background:var(--bg-2);border-radius:999px;padding:.15rem .5rem;margin:0;}
.hero-cap .q b{color:var(--accent-ink);}
.hero-cap .d{margin-top:.55rem;padding:0 .2rem;font-size:.92rem;}

/* hero chart (replaces the stat tiles) */
.hero-chart{margin:0;border:1px solid var(--line);border-radius:12px;background:var(--surface);padding:1rem 1rem .85rem;
  --hc-base:var(--bg-2);--hc-base-line:var(--line-2);}
.hc-title{font-weight:700;font-size:.98rem;color:var(--ink);display:flex;align-items:baseline;gap:.6rem;flex-wrap:wrap;margin-bottom:.4rem;}
.hc-sub{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:500;}
.hc-svg{width:100%;height:auto;display:block;}
.hc-axis{stroke:var(--line-2);stroke-width:1;}
.hc-ours{fill:var(--accent);}
.hc-val{font-family:var(--font-mono);font-size:12px;font-weight:600;fill:var(--ink-2);text-anchor:middle;}
.hc-val.ours{fill:var(--ink);}
.hc-cat{font-size:12px;fill:var(--muted);text-anchor:middle;}
.hc-bar{cursor:default;}
.hc-bar:hover rect{filter:brightness(1.08);}
.hc-legend{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;margin-top:.5rem;font-size:.8rem;color:var(--ink-2);}
.hc-legend .sw{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:.4rem;vertical-align:-2px;border:1px solid var(--line-2);}
.hc-legend .sw.base{background:repeating-linear-gradient(45deg,var(--line-2) 0 2px,var(--bg-2) 2px 5px);}
.hc-legend .sw.ours{background:var(--accent);border-color:var(--accent);}
.hc-legend b{color:var(--ink);}
.hc-more{margin-left:auto;color:var(--accent-ink);text-decoration:none;font-weight:600;}
.hc-more:hover{text-decoration:underline;}

/* collapsible method modules */
details.module{border:1px solid var(--line);border-radius:12px;background:var(--surface);margin-top:1.2rem;overflow:hidden;}
details.module:first-of-type{margin-top:clamp(1.8rem,3vw,2.4rem);}
summary.module-head{display:flex;align-items:center;gap:1rem;padding:1.1rem 1.3rem;cursor:pointer;list-style:none;user-select:none;}
summary.module-head::-webkit-details-marker{display:none;}
summary.module-head .method-title{flex:1 1 auto;font-size:clamp(1.1rem,1.8vw,1.35rem);}
summary.module-head::after{content:"\f078";font-family:"Font Awesome 5 Free";font-weight:900;flex:0 0 auto;display:grid;place-items:center;width:2rem;height:2rem;border-radius:50%;border:1px solid var(--line-2);font-size:.7rem;color:var(--muted);transition:transform .3s,background .2s,color .2s,border-color .2s;}
summary.module-head:hover::after{border-color:var(--accent);color:var(--accent-ink);background:var(--accent-wash);}
details.module[open]>summary.module-head{border-bottom:1px solid var(--line);}
details.module[open]>summary.module-head::after{transform:rotate(180deg);background:var(--accent);border-color:var(--accent);color:var(--on-accent);}
.module-body{padding:1.2rem 1.3rem 1.4rem;animation:fadeUp .4s cubic-bezier(.2,.6,.2,1) both;}
.module-body .method-cols{margin-top:0;}
.module-body .method-cols p:first-child{margin-top:0;}
.module-body .prim-grid{margin-top:1.2rem;}

/* side navigator (desktop only) */
.side-nav{position:fixed;left:1.2rem;top:50%;transform:translateY(-50%);z-index:80;display:none;flex-direction:column;gap:.15rem;}
@media(min-width:1440px){.side-nav{display:flex;}}
.side-nav a{display:flex;align-items:center;gap:.6rem;padding:.4rem .6rem;border-radius:8px;text-decoration:none;color:var(--muted);font-size:.82rem;font-weight:500;transition:color .2s,background .2s;}
.side-nav a .dot{width:7px;height:7px;border-radius:50%;background:var(--line-2);flex:0 0 auto;transition:background .2s,transform .2s;}
.side-nav a .lbl{opacity:0;transform:translateX(-4px);transition:opacity .2s,transform .2s;}
.side-nav a kbd{opacity:0;font-family:var(--font-mono);font-size:.62rem;border:1px solid var(--line-2);border-radius:4px;padding:.05rem .3rem;color:var(--muted);transition:opacity .2s;}
.side-nav:hover a .lbl,.side-nav:hover a kbd,.side-nav a:focus-visible .lbl{opacity:1;transform:none;}
.side-nav a:hover{color:var(--ink);background:var(--surface);}
.side-nav a.active{color:var(--accent-ink);}
.side-nav a.active .dot{background:var(--accent);transform:scale(1.35);box-shadow:0 0 0 4px var(--accent-wash);}

/* hero instruction box: keep the sentence on one line */
.hero-cap .q{flex-wrap:nowrap;font-size:clamp(.92rem,1.1vw,1.05rem);white-space:nowrap;overflow:hidden;}
.hero-cap .q .n{flex:0 0 auto;}
.hero-cap .q b{white-space:nowrap;}
@media(max-width:560px){.hero-cap .q{white-space:normal;flex-wrap:wrap;}}
.hero-cap .q .txt{min-width:0;overflow:hidden;text-overflow:ellipsis;}

/* theme-aware paper figures: transparent PNG pairs, panel follows the surface color */
.figure.lit{background:var(--surface);}
.figure.lit .figcap{color:var(--muted);}
.figure.lit .figcap strong,.figure.lit .figcap .sc{color:var(--ink);}
.figure img.fig-dark,img.fig-dark{display:none;}
:root[data-theme="dark"] .figure img.fig-light,:root[data-theme="dark"] img.fig-light{display:none;}
:root[data-theme="dark"] .figure img.fig-dark,:root[data-theme="dark"] img.fig-dark{display:block;}
/* figures that only have a light-ink version stay on a white panel in dark mode */
:root[data-theme="dark"] .figure.lit.light-only{background:#ffffff;border-color:#ffffff;}
:root[data-theme="dark"] .figure.lit.light-only .figcap{color:#555b64;}
:root[data-theme="dark"] .figure.lit.light-only .figcap strong,:root[data-theme="dark"] .figure.lit.light-only .figcap .sc{color:#1c1f24;}
:root[data-theme="dark"] .figure.light-only img.fig-light{display:block;}
/* Module A: figure column stretches to the text column; caption small and pinned to the bottom */
.module-body .method-cols{align-items:stretch;}
.module-body .method-cols>.figure{display:flex;flex-direction:column;}
.module-body .method-cols>.figure img{flex:0 0 auto;}
.module-body .method-cols>.figure .figcap{margin-top:auto !important;padding-top:.6rem;font-size:.8rem;line-height:1.4;}
.btn .arxiv-mark{width:1.05em;height:1.05em;fill:currentColor;display:block;}
/* colored icons only; the buttons themselves stay neutral */
.btn.paper .i{color:#d64541;}
.btn.ghost.arxiv .i{color:#b31b1b;}
:root[data-theme="dark"] .btn.ghost.arxiv .i{color:#f07a72;}
.btn:hover .i{color:inherit;}
/* BibTeX block follows the theme (light: paper-like card, dark: code-dark) */
.bibtex{background:var(--bg-2);color:var(--ink);border-color:var(--line);}
.copy-btn{background:var(--surface);color:var(--ink-2);border-color:var(--line-2);}
.copy-btn:hover{background:var(--accent);color:var(--on-accent);border-color:var(--accent);}
:root[data-theme="dark"] .bibtex{background:var(--code-bg);color:#cdd6e0;}
:root[data-theme="dark"] .copy-btn{background:rgba(255,255,255,.07);color:#cdd6e0;border-color:rgba(255,255,255,.16);}
/* hero chart: baseline bars readable in both themes */
.hero-chart{--hc-base:rgba(120,128,140,.28);--hc-base-line:#7a828e;}
:root[data-theme="dark"] .hero-chart{--hc-base:rgba(160,168,180,.22);--hc-base-line:#aab2be;}
.hc-base-bar{stroke:var(--hc-base-line);stroke-width:1.2;}
.hc-legend .sw.base{background:repeating-linear-gradient(45deg,var(--hc-base-line) 0 2px,var(--hc-base) 2px 5px);border-color:var(--hc-base-line);}
/* demo videos: "wrist camera only" badge (bottom-left, clear of the burned-in 2x mark) */
.vid-box .cam-badge{position:absolute;left:.7rem;bottom:.7rem;z-index:2;display:inline-flex;align-items:center;gap:.4rem;
  background:rgba(0,0,0,.62);color:#fff;backdrop-filter:blur(6px);font-family:var(--font-mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;padding:.3rem .6rem;border-radius:999px;pointer-events:none;}
.vid-box .cam-badge i{color:var(--accent);font-size:.75rem;}
/* info bar under execution videos: instruction on the left, robot-input badge on the right */
.vid-meta{display:flex;align-items:center;justify-content:space-between;gap:.8rem;margin-top:.6rem;padding:.55rem .8rem;
  border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:10px;background:var(--surface-2);}
.vm-q{display:inline-flex;align-items:baseline;gap:.5rem;font-size:.92rem;font-weight:600;color:var(--ink);min-width:0;}
.vm-q i{color:var(--accent-ink);font-size:.7rem;flex:0 0 auto;position:relative;top:-1px;}
.vm-q b{color:var(--accent-ink);}
.vm-badge{flex:0 0 auto;display:inline-flex;align-items:center;gap:.4rem;font-family:var(--font-mono);font-size:.64rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);
  border:1px solid var(--line-2);border-radius:999px;padding:.25rem .6rem;white-space:nowrap;}
.vm-badge i{color:var(--accent-ink);font-size:.7rem;}
@media(max-width:560px){.vid-meta{flex-direction:column;align-items:flex-start;}}
.chips{margin-top:.7rem;}
/* camera badge back inside the video, top-right (clear of the burned-in 2x mark at top-left) */
.vid-box .cam-badge{left:auto;right:.7rem;top:.7rem;bottom:auto;}
.vid-meta{justify-content:flex-start;}
.hero-video .tag i{color:var(--accent);font-size:.8rem;}
/* history videos: recorded by the robot's wrist camera */
.cam-badge.rec .dot{width:7px;height:7px;border-radius:50%;background:#ff4d4d;box-shadow:0 0 0 3px rgba(255,77,77,.3);animation:recblink 1.6s ease-in-out infinite;}
@keyframes recblink{0%,100%{opacity:1;}50%{opacity:.35;}}
@media (prefers-reduced-motion:reduce){.cam-badge.rec .dot{animation:none;}}
/* instruction bar: the whole sentence is one inline run, so the bold word gets no extra gaps */
.vm-q{display:block;font-size:.92rem;font-weight:600;color:var(--ink);}
.vm-q i{margin-right:.45rem;}
.vm-q [data-role="sub"]{display:inline;}
/* simulation card: larger history clip (1 : 1.35) and the query bar at the bottom */
@media(min-width:820px){.case.sim .case-grid{grid-template-columns:1fr 1.35fr;}}
.case.sim .vid-meta{margin-top:.8rem;}
.vid-box .cam-badge{max-width:calc(100% - 4.2rem);white-space:normal;text-align:right;line-height:1.3;}