/* ============================================================
   CARVE — project page
   Design language matched to geyuyao.com:
   terracotta accent · Source Serif 4 / Space Mono · sharp corners
   · film-grain / scanline / vignette texture
   ============================================================ */

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;font-size:19px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

:root{
  --bg:#faf7f2; --bg2:#f3ece2; --card:#fdfbf7;
  --fg:#1c1a16; --muted:#6b6258; --line:rgba(28,26,22,.13);
  --accent:#B5613C; --accent2:#D6402A; --accent-soft:rgba(181,97,60,.11);
  --maxw:1180px;
  --ff-display:'Source Serif 4',Georgia,'Times New Roman',serif;
  --ff-mono:'Space Mono',ui-monospace,monospace;
  --ff-body:'Source Serif 4',Georgia,'Times New Roman',serif;
}
[data-theme="dark"]{
  --bg:#161310; --bg2:#1d1813; --card:#1f1a15;
  --fg:#ece6dd; --muted:#9b8f80; --line:rgba(236,230,221,.12);
  --accent:#D4845C; --accent2:#FF6B35; --accent-soft:rgba(212,132,92,.14);
}

body{
  margin:0; background:var(--bg); color:var(--fg);
  font-family:var(--ff-body); font-size:1rem; line-height:1.68;
  -webkit-font-smoothing:antialiased; overflow-x:hidden;
  transition:background .4s ease,color .4s ease;
}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none}
::selection{background:var(--accent-soft);color:inherit}

/* thin terracotta scrollbar (matches homepage) */
:root{scrollbar-width:thin;scrollbar-color:rgba(181,97,60,.4) transparent}
::-webkit-scrollbar{width:7px;height:7px}
::-webkit-scrollbar-thumb{background:rgba(181,97,60,.4)}
[data-theme="dark"] ::-webkit-scrollbar-thumb{background:rgba(212,132,92,.4)}

/* ---------- global texture overlays ---------- */
.grain,.scan{position:fixed;inset:0;pointer-events:none;z-index:9000}
.grain{
  opacity:.04;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size:170px 170px;
}
[data-theme="dark"] .grain{opacity:.05;mix-blend-mode:screen}
.scan{
  opacity:.025;
  background-image:repeating-linear-gradient(0deg,#000 0 1px,transparent 1px 4px);
}
[data-theme="dark"] .scan{opacity:.09}

/* ---------- scroll progress ---------- */
.progress{position:fixed;top:0;left:0;height:3px;width:100%;z-index:9500;background:transparent}
.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));box-shadow:0 0 12px var(--accent2)}

/* ---------- nav ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:8000;
  display:flex;align-items:center;justify-content:space-between;
  padding:16px clamp(18px,4vw,46px);
  transition:background .35s ease,backdrop-filter .35s ease,border-color .35s ease;
  border-bottom:1px solid transparent;
}
.nav.solid{background:var(--bg);background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(12px) saturate(1.2);border-bottom-color:var(--line)}
/* nav sits over the dark hero until scrolled -> force light ink */
.nav:not(.solid) .nav__brand,.nav:not(.solid) .nav__links a,.nav:not(.solid) .icon-btn{color:#f3ece2}
.nav:not(.solid) .icon-btn{border-color:rgba(255,255,255,.3)}
.nav:not(.solid) .nav__links a:hover,.nav:not(.solid) .nav__links a.active{color:var(--accent)}
.nav:not(.solid) .icon-btn:hover{border-color:var(--accent);color:var(--accent)}
.nav__brand{font-family:var(--ff-display);font-weight:700;letter-spacing:.02em;font-size:1.027rem;color:var(--fg);display:flex;align-items:center;gap:10px}
.nav__brand .dot{width:10px;height:10px;background:var(--accent2);border-radius:50%;box-shadow:0 0 10px var(--accent2)}
.nav__links{display:flex;gap:30px;align-items:center}
.nav__links a{font-family:var(--ff-mono);font-size:.842rem;letter-spacing:.11em;text-transform:uppercase;color:var(--muted);transition:color .2s}
.nav__links a:hover,.nav__links a.active{color:var(--accent)}
.nav__tools{display:flex;gap:10px;align-items:center}
.icon-btn{
  width:44px;height:44px;display:grid;place-items:center;cursor:pointer;
  background:transparent;border:1px solid var(--line);color:var(--fg);
  transition:all .2s ease;
}
.icon-btn:hover{border-color:var(--accent);color:var(--accent)}
.icon-btn svg{width:20px;height:20px}
@media(max-width:820px){.nav__links{display:none}}

/* ---------- hero (always deep/dark, cinematic) ---------- */
.hero{
  position:relative;min-height:100svh;display:flex;flex-direction:column;
  justify-content:center;align-items:center;text-align:center;
  padding:120px 20px 80px;overflow:hidden;
  background:radial-gradient(ellipse 80% 60% at 50% 18%,#241a13 0%,#120d09 60%,#0c0805 100%);
  color:#f3ece2;
}
#field{position:absolute;inset:0;width:100%;height:100%;z-index:0}
.hero__vign{position:absolute;inset:0;z-index:1;pointer-events:none;
  background:radial-gradient(ellipse at center,transparent 50%,rgba(0,0,0,.55) 100%)}
.hero__inner{position:relative;z-index:2;max-width:1000px;animation:rise .9s cubic-bezier(.2,.7,.2,1) both}
.eyebrow{
  font-family:var(--ff-mono);font-size:.842rem;letter-spacing:.3em;text-transform:uppercase;
  color:var(--accent);margin-bottom:26px;display:inline-flex;gap:14px;align-items:center;
}
.eyebrow::before,.eyebrow::after{content:"";width:34px;height:1px;background:currentColor;opacity:.5}
.hero h1{
  font-family:var(--ff-display);font-weight:700;letter-spacing:-.012em;line-height:1.06;
  font-size:clamp(1.684rem,4.8vw,3.116rem);margin:0 0 18px;color:#fff;
}
.hero h1 .hl{
  background-image:linear-gradient(90deg,var(--accent),var(--accent2));
  background-repeat:no-repeat;background-position:0 92%;background-size:0% .12em;
  padding-bottom:.04em;animation:wipe2 1s cubic-bezier(.6,0,.2,1) .55s forwards;
}
.hero__sub{font-size:clamp(1rem,2.1vw,1.196rem);color:#cbbfb1;max-width:700px;margin:0 auto 30px;font-weight:300}
.hero__authors{font-size:1rem;color:#e7ddd0;line-height:1.9;max-width:880px;margin:0 auto 8px}
.hero__authors a{color:#e7ddd0;border-bottom:1px solid transparent;transition:.2s}
.hero__authors a:hover{color:#fff;border-bottom-color:var(--accent)}
.hero__authors sup{color:var(--accent)}
.hero__authors .au{white-space:nowrap}
.hero__aff{font-size:.921rem;color:#a89b8c;max-width:880px;margin:8px auto 0;font-family:var(--ff-mono);letter-spacing:.02em}
.hero__corr{font-size:.842rem;color:#8b7f71;margin-top:6px;font-family:var(--ff-mono)}

.btns{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:40px}
.btn{
  /* Seven actions have to share one row inside the 1000px hero column, so the
     tracking and padding run tighter than the prose sets elsewhere. */
  display:inline-flex;align-items:center;gap:8px;padding:13px 16px;cursor:pointer;
  font-family:var(--ff-mono);font-size:.789rem;letter-spacing:.05em;text-transform:uppercase;
  border:1px solid rgba(255,255,255,.28);color:#f3ece2;background:rgba(255,255,255,.03);
  transition:all .22s ease;
}
.btn:hover{background:var(--accent);border-color:var(--accent);color:#1a120c;transform:translateY(-2px)}
.btn svg{width:18px;height:18px}
.btn--solid{background:var(--accent);border-color:var(--accent);color:#1a120c}
.btn--solid:hover{background:var(--accent2);border-color:var(--accent2)}

/* Below the width where all seven fit on one line, flex-wrap fills greedily and
   drops a lone button onto its own row. Fixing the track count splits them
   4+3 (and 2+2+2+1 on phones, where the last one takes the full row). */
@media(max-width:1023px){
  .btns .btn{flex:0 0 calc(25% - 8px);justify-content:center}
}
@media(max-width:640px){
  .btns .btn{flex:0 0 calc(50% - 5px)}
  .btns .btn:last-child{flex-basis:100%}
}

.scrollcue{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2;
  font-family:var(--ff-mono);font-size:.789rem;letter-spacing:.28em;text-transform:uppercase;color:#9c9082;
  display:flex;flex-direction:column;align-items:center;gap:10px;animation:rise 1s 1.1s both}
.scrollcue span{width:1px;height:42px;background:linear-gradient(var(--accent),transparent);animation:cue 1.8s ease-in-out infinite}

/* ---------- generic section ---------- */
.section{position:relative;padding:clamp(70px,11vw,140px) clamp(20px,5vw,40px);max-width:var(--maxw);margin:0 auto}
.section--alt{max-width:none;background:var(--bg2)}
.section--alt .inner{max-width:var(--maxw);margin:0 auto}
.eyebrow--sec{color:var(--accent);justify-content:flex-start;margin-bottom:14px}
.eyebrow--sec::before{display:none}
.h2{font-family:var(--ff-display);font-weight:700;letter-spacing:-.011em;line-height:1.14;
  font-size:clamp(1.474rem,4.1vw,2.526rem);margin:0 0 22px;max-width:20ch}
/* The negative right margin cancels the dot's inline advance so it can never be
   the thing that overflows `max-width` and gets pushed onto a line of its own;
   it trails the final character instead. */
.h2 .dot{display:inline-block;width:13px;height:13px;background:var(--accent2);border-radius:50%;margin-left:8px;margin-right:-21px;vertical-align:super}
.lead{font-size:clamp(1rem,1.7vw,1.145rem);color:var(--muted);max-width:62ch;line-height:1.75}

/* Opening paragraph of the page gets an editorial drop cap. `initial-letter`
   does the sinking natively in WebKit; the float rules are the fallback that
   every other engine still needs. */
.lead--drop::first-letter{
  float:left;
  font-family:var(--ff-display);
  font-weight:700;
  font-size:3.5em;
  line-height:.78;
  margin:.04em .1em 0 0;
  color:var(--accent2);
  -webkit-initial-letter:3 3;
  initial-letter:3 3;
}
@supports (initial-letter:3 3) or (-webkit-initial-letter:3 3){
  .lead--drop::first-letter{float:none;font-size:inherit;line-height:inherit;margin:0 .1em 0 0}
}
.muted{color:var(--muted)}
.kbd{font-family:var(--ff-mono);background:var(--accent-soft);color:var(--accent);padding:1px 7px;font-size:.85em;white-space:nowrap}

/* reveal-on-scroll */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .9s cubic-bezier(.2,.7,.2,1),transform .9s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.1s}.reveal[data-d="2"]{transition-delay:.2s}
.reveal[data-d="3"]{transition-delay:.3s}.reveal[data-d="4"]{transition-delay:.4s}

/* ---------- teaser mask slider ---------- */
.teaser{position:relative;background:#0c0805;color:#f3ece2;padding:clamp(60px,9vw,120px) 20px;text-align:center;overflow:hidden}
.teaser .eyebrow--sec{justify-content:center;color:var(--accent)}
.teaser h2{font-family:var(--ff-display);font-weight:700;font-size:clamp(1.347rem,3.6vw,2.189rem);margin:0 auto 14px;max-width:32ch}
.teaser p{color:#b6a99b;max-width:60ch;margin:0 auto 40px}
.compare{position:relative;max-width:760px;margin:0 auto;aspect-ratio:4/3;user-select:none;
  border:1px solid rgba(255,255,255,.12);box-shadow:0 30px 80px rgba(0,0,0,.5);overflow:hidden;touch-action:none;cursor:ew-resize}
.compare img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;pointer-events:none}
.compare__top{clip-path:inset(0 0 0 50%)}
.compare__div{position:absolute;top:0;bottom:0;left:50%;width:2px;background:var(--accent2);box-shadow:0 0 14px var(--accent2);z-index:3;transform:translateX(-1px)}
.compare__handle{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:4;width:44px;height:44px;
  background:var(--accent2);border-radius:50%;display:grid;place-items:center;color:#fff;box-shadow:0 4px 20px rgba(0,0,0,.5)}
.compare__lab{position:absolute;top:14px;z-index:3;font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.18em;
  text-transform:uppercase;padding:5px 10px;background:rgba(0,0,0,.55);color:#fff}
.compare__lab.l{left:14px}.compare__lab.r{right:14px;color:var(--accent2)}
/* teaser: three comparisons side by side */
.compare-row{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:1040px;margin:0 auto}
.compare-cell{margin:0;display:flex;flex-direction:column}
.compare-row .compare{max-width:none;margin:0}
.compare-row .compare__handle{width:34px;height:34px}
.compare-row .compare__lab{font-size:.632rem;top:10px;padding:4px 8px}
.compare-cap{margin-top:13px;font-family:var(--ff-mono);font-size:.789rem;color:#b6a99b;line-height:1.55;text-align:left}
.compare-cap .cq{display:block;color:#cbbfb1;margin-bottom:5px}
.compare-cap s{color:#d9534f;text-decoration-color:rgba(217,83,79,.6)}
.compare-cap b{color:var(--accent)}
@media(max-width:760px){.compare-row{grid-template-columns:1fr;max-width:460px}}

/* ---------- finding cards ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:46px}
.card{background:var(--card);border:1px solid var(--line);padding:30px 26px;position:relative;transition:border-color .3s,transform .3s}
.card:hover{border-color:var(--accent);transform:translateY(-4px)}
.card__n{font-family:var(--ff-mono);font-size:.789rem;letter-spacing:.2em;color:var(--accent);margin-bottom:16px}
.card h3{font-family:var(--ff-display);font-size:1rem;margin:0 0 10px;font-weight:600;letter-spacing:-.01em}
.card p{font-size:.921rem;color:var(--muted);margin:0;line-height:1.65}
@media(max-width:780px){.cards{grid-template-columns:1fr}}

/* ---------- scrollytelling ---------- */
.scrolly{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;margin-top:40px}
.scrolly__sticky{position:sticky;top:14vh;height:max-content}
.scrolly__media{border:1px solid var(--line);background:var(--card);overflow:hidden;position:relative}
.scrolly__media img{width:100%;display:block}
.scrolly__cap{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.06em;color:var(--muted);padding:12px 14px;border-top:1px solid var(--line)}
.steps{display:flex;flex-direction:column;gap:14vh;padding:8vh 0}
.step{border-left:2px solid var(--line);padding:4px 0 4px 26px;transition:border-color .4s}
.step.active{border-color:var(--accent)}
.step__k{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:10px;opacity:.5;transition:opacity .4s}
.step.active .step__k{opacity:1}
.step h3{font-family:var(--ff-display);font-size:1.095rem;margin:0 0 10px;font-weight:600}
.step p{color:var(--muted);font-size:.921rem;margin:0}
@media(max-width:860px){.scrolly{grid-template-columns:1fr}.scrolly__sticky{position:relative;top:0}.steps{gap:5vh;padding:5vh 0}}

/* ---------- figure block ---------- */
.figure{margin:42px 0 0;border:1px solid var(--line);background:var(--card)}
.figure img{width:100%;display:block}
.figure figcaption{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.04em;color:var(--muted);padding:14px 18px;border-top:1px solid var(--line);line-height:1.6}
.two{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:780px){.two{grid-template-columns:1fr}}

/* ---------- equation ---------- */
.eq{background:var(--card);border:1px solid var(--line);border-left:3px solid var(--accent);
  padding:24px 28px;margin:26px 0;overflow-x:auto}
.eq .katex{font-size:1.25em}
.eqlabel{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}

/* ---------- tau scrubber ---------- */
.tau{margin-top:46px;background:var(--card);border:1px solid var(--line);padding:clamp(20px,3vw,34px)}
.tau__grid{display:grid;grid-template-columns:1.1fr .9fr;gap:34px;align-items:center}
.tau__stage{position:relative;background:#0c0805;border:1px solid var(--line);aspect-ratio:4/3;display:grid;place-items:center;overflow:hidden}
.tau__stage img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;opacity:0;transition:opacity .12s linear}
.tau__stage img.on{opacity:1}
.tau__read{font-family:var(--ff-mono)}
.tau__big{font-family:var(--ff-display);font-weight:700;font-size:clamp(2.021rem,6vw,3.032rem);line-height:1;color:var(--accent)}
.tau__big span{color:var(--muted);font-size:.4em}
.tau__desc{color:var(--muted);font-size:.921rem;margin:14px 0 26px}
input[type=range].slider{-webkit-appearance:none;appearance:none;width:100%;height:3px;background:var(--line);outline:none;margin:8px 0}
input[type=range].slider::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;background:var(--accent2);cursor:pointer;border:3px solid var(--bg);box-shadow:0 0 0 1px var(--accent2)}
input[type=range].slider::-moz-range-thumb{width:20px;height:20px;background:var(--accent2);cursor:pointer;border:3px solid var(--bg)}
.tau__scale{display:flex;justify-content:space-between;font-family:var(--ff-mono);font-size:.737rem;color:var(--muted);letter-spacing:.1em;margin-top:6px}
@media(max-width:780px){.tau__grid{grid-template-columns:1fr}}

/* ---------- algorithm ---------- */
.algo{margin-top:30px;background:var(--card);border:1px solid var(--line);font-family:var(--ff-mono);font-size:.842rem}
.algo__h{padding:12px 18px;border-bottom:1px solid var(--line);color:var(--accent);letter-spacing:.1em;text-transform:uppercase;font-size:.737rem}
.algo ol{margin:0;padding:18px 18px 18px 44px;line-height:2}
.algo li{color:var(--fg)}.algo li::marker{color:var(--accent)}
.algo .c{color:var(--muted)}

/* ---------- results ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:40px 0}
.stat{border:1px solid var(--line);background:var(--card);padding:26px 22px;text-align:left}
.stat__v{font-family:var(--ff-display);font-weight:700;font-size:clamp(1.684rem,4.4vw,2.442rem);line-height:1;color:var(--accent);letter-spacing:-.02em}
.stat__l{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-top:12px;line-height:1.5}
@media(max-width:780px){.stats{grid-template-columns:1fr 1fr}}

.chart{margin-top:30px;background:var(--card);border:1px solid var(--line);padding:clamp(20px,3vw,34px)}
.chart__tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:30px}
.tab{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.08em;text-transform:uppercase;
  padding:8px 14px;border:1px solid var(--line);background:transparent;color:var(--muted);cursor:pointer;transition:all .2s}
.tab:hover{border-color:var(--accent);color:var(--accent)}
.tab.active{background:var(--accent);border-color:var(--accent);color:#fff}
[data-theme="dark"] .tab.active{color:#1a120c}
.bars{display:flex;flex-direction:column;gap:22px}
.barrow{display:grid;grid-template-columns:130px 1fr;gap:18px;align-items:center}
.barrow__m{font-family:var(--ff-mono);font-size:.789rem;color:var(--fg)}
.barrow{align-items:start}
.barpair{display:flex;flex-direction:column;gap:5px}
.bar{position:relative;height:21px;background:var(--bg2);overflow:hidden}
.bar i{position:absolute;left:0;top:0;bottom:0;width:0;transition:width .9s cubic-bezier(.2,.7,.2,1)}
.bar.van i{background:repeating-linear-gradient(45deg,var(--muted),var(--muted) 6px,transparent 6px,transparent 11px);opacity:.5}
.bar.base i{background:var(--muted);opacity:.38}
.bar.ours i{background:linear-gradient(90deg,var(--accent),var(--accent2))}
.bar.best{box-shadow:inset 0 0 0 1.5px var(--accent2)}
.bar b{position:absolute;right:8px;top:50%;transform:translateY(-50%);font-family:var(--ff-mono);font-size:.737rem;color:var(--fg);z-index:2;display:inline-flex;align-items:center;gap:6px}
.bar__win{font-size:.632rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent2)}
.bar__tag{position:absolute;left:8px;top:50%;transform:translateY(-50%);font-family:var(--ff-mono);font-size:.632rem;letter-spacing:.08em;text-transform:uppercase;color:var(--fg);opacity:.7;z-index:2}
.chart__legend{display:flex;flex-wrap:wrap;gap:20px;margin-top:26px;font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.chart__legend span{display:inline-flex;align-items:center;gap:8px}
.swatch{width:22px;height:11px;display:inline-block}
.swatch.van{background:repeating-linear-gradient(45deg,var(--muted),var(--muted) 5px,transparent 5px,transparent 9px);opacity:.6}
.swatch.base{background:var(--muted);opacity:.4}
.swatch.car{background:linear-gradient(90deg,var(--accent),var(--accent2))}
.swatch.best{background:transparent;box-shadow:inset 0 0 0 1.5px var(--accent2)}
@media(max-width:620px){.barrow{grid-template-columns:1fr}.barrow__m{margin-bottom:6px}}

/* ---------- bibtex ---------- */
.cite{position:relative;background:#0c0805;border:1px solid rgba(255,255,255,.1)}
[data-theme="light"] .cite{background:#1a140f}
.cite pre{margin:0;padding:26px 28px;overflow-x:auto;color:#d8cdbf;font-family:var(--ff-mono);font-size:.842rem;line-height:1.7}
.cite .copy{position:absolute;top:14px;right:14px}

/* ---------- footer ---------- */
.foot{border-top:1px solid var(--line);padding:60px clamp(20px,5vw,40px);max-width:var(--maxw);margin:0 auto;
  display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;align-items:center}
.foot__l{font-family:var(--ff-mono);font-size:.789rem;letter-spacing:.06em;color:var(--muted);line-height:1.8}
.foot a{color:var(--accent)}
.foot__links{display:flex;gap:18px;flex-wrap:wrap;font-family:var(--ff-mono);font-size:.789rem;letter-spacing:.1em;text-transform:uppercase}

/* ---------- keyframes ---------- */
@keyframes rise{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
@keyframes wipe2{to{background-size:100% .12em}}
@keyframes cue{0%,100%{opacity:.3;transform:scaleY(.6)}50%{opacity:1;transform:scaleY(1)}}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1!important;transform:none!important}
  .hero h1 .hl{animation:none;background-size:100% .12em}
  .scrollcue span{animation:none}
}

/* ---------- case explorer (editorial) ---------- */
.cx{position:relative;margin-top:44px;border:1px solid var(--line);background:var(--card)}
.cx::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent2));z-index:2}
.cx__head{padding:28px 32px 22px;border-bottom:1px solid var(--line)}
.cx__meta{display:flex;justify-content:space-between;align-items:center;gap:14px;font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}
.cx__no b{color:var(--accent)}
.cx__model{color:var(--accent)}
.cx__q{font-family:var(--ff-display);font-weight:600;font-size:clamp(1.011rem,2.4vw,1.432rem);line-height:1.32;margin:0;letter-spacing:-.01em}
.cx__q::before{content:"\201C"}.cx__q::after{content:"\201D"}
.cx__flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:center;padding:32px}
.cx__stage{margin:0;display:flex;flex-direction:column;gap:12px;min-width:0}
.cx__frame{position:relative;aspect-ratio:4/3;background:#0c0805;border:1px solid var(--line);overflow:hidden}
.cx__frame img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;transition:transform .55s cubic-bezier(.2,.7,.2,1),opacity .4s ease}
.cx__stage:hover .cx__frame img{transform:scale(1.05)}
.cx__frame--att .att-base{filter:brightness(.36) saturate(.65)}
.cx__frame--att .att{mix-blend-mode:screen}
.cx__badge{position:absolute;left:0;top:0;z-index:4;width:30px;height:30px;display:grid;place-items:center;background:var(--accent);color:#160f0a;font-family:var(--ff-mono);font-weight:700;font-size:.789rem}
.cx__cap{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);text-align:center}
.cx__arrow{display:grid;place-items:center;color:var(--accent);font-size:1.263rem;padding:0 16px;opacity:.65}
.cx__bbox{position:absolute;z-index:3;border:2px solid var(--accent2);
  box-shadow:0 0 0 9999px rgba(8,5,3,.5),0 0 18px rgba(255,107,53,.55);
  opacity:0;transition:opacity .55s ease .25s;pointer-events:none}
.cx__bbox.on{opacity:1}
.cx__bbox span{position:absolute;left:-2px;top:-18px;background:var(--accent2);color:#160f0a;font-family:var(--ff-mono);
  font-size:.632rem;letter-spacing:.12em;text-transform:uppercase;padding:2px 6px;white-space:nowrap}
.cx__verdict{display:flex;flex-wrap:wrap;align-items:stretch;justify-content:center;gap:16px;padding:0 32px 30px}
.ans{flex:1 1 240px;max-width:340px;border:1px solid var(--line);padding:18px 22px;display:flex;flex-direction:column;gap:7px}
.ans__k{font-family:var(--ff-mono);font-size:.632rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}
.ans__v{font-family:var(--ff-display);font-weight:700;font-size:1.221rem;line-height:1.15;word-break:break-word}
.ans__x{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.04em}
.ans--bad{border-color:rgba(217,83,79,.4)}
.ans--bad .ans__v{color:var(--muted);text-decoration:line-through;text-decoration-color:rgba(217,83,79,.55)}
.ans--bad .ans__x{color:#d9534f}
.ans--good{border-color:rgba(46,158,87,.45);background:var(--accent-soft)}
.ans--good .ans__v{color:var(--accent)}
.ans--good .ans__x{color:#2e9e57}
[data-theme="dark"] .ans--good .ans__x{color:#5fd08a}
.cx__to{display:grid;place-items:center;font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);padding:0 4px}
.cx__film{display:flex;gap:10px;overflow-x:auto;padding:0 32px 28px}
.cx__film .thumb{flex:0 0 auto;width:96px;height:72px;border:1px solid var(--line);overflow:hidden;cursor:pointer;opacity:.42;transition:all .25s;background:#0c0805}
.cx__film .thumb img{width:100%;height:100%;object-fit:cover}
.cx__film .thumb.active{opacity:1;border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.cx__film .thumb:hover{opacity:.8}
@media(max-width:820px){
  .cx__flow{grid-template-columns:1fr;gap:8px;padding:22px}
  .cx__arrow{transform:rotate(90deg);padding:6px 0;font-size:1.011rem}
  .cx__verdict{flex-direction:column;align-items:stretch;gap:10px}
  .ans{max-width:none}
}

/* ---------- layer convergence slider ---------- */
.layerbox{margin-top:40px;background:var(--card);border:1px solid var(--line);padding:clamp(18px,3vw,30px)}
.layerbox__grid{display:grid;grid-template-columns:1fr;gap:18px}
.layerbox__stage{position:relative;background:#0c0805;overflow:hidden;border:1px solid var(--line);aspect-ratio:16/10}
.layerbox__stage img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;opacity:0;transition:opacity .08s linear}
.layerbox__stage img.on{opacity:1}
.layerbox__bar{display:flex;align-items:center;gap:16px;margin-top:16px}
.layerbox__bar input{flex:1}
.layerbox__k{font-family:var(--ff-mono);font-size:.789rem;color:var(--accent);white-space:nowrap;min-width:118px}
.layerbox__k b{font-family:var(--ff-display);font-size:1rem}
.layerbox__zone{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);min-width:120px;text-align:right}

/* ---------- layer film strip ---------- */
.figure--wide{margin-top:36px}
.film-wrap{margin-top:48px}
.film{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;background:#0c0805;border:1px solid var(--line);padding:20px 18px;position:relative}
.film::before,.film::after{content:"";position:absolute;left:16px;right:16px;height:6px;pointer-events:none;
  background:repeating-linear-gradient(90deg,transparent 0 6px,rgba(245,240,235,.16) 6px 13px)}
.film::before{top:6px}
.film::after{bottom:6px}
.film__cell{position:relative;aspect-ratio:3/2;overflow:hidden;background:#000;border:1px solid rgba(255,255,255,.07);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease}
.film__cell img{width:100%;height:100%;object-fit:contain;display:block}
.film__cell b{position:absolute;left:0;bottom:0;z-index:2;font-family:var(--ff-mono);font-size:.632rem;font-weight:400;
  color:#fff;background:rgba(0,0,0,.55);padding:1px 5px}
.film__cell b{font-size:.632rem}
.film__cell:hover{transform:scale(1.4);z-index:6;box-shadow:0 10px 34px rgba(0,0,0,.7);border-color:var(--accent2)}
.film__axis{display:flex;justify-content:space-between;gap:10px;font-family:var(--ff-mono);font-size:.632rem;
  letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-top:12px}
@media(max-width:900px){.film{grid-template-columns:repeat(3,1fr)}}
@media(max-width:560px){.film{grid-template-columns:repeat(2,1fr)}.film__axis{font-size:.632rem}}

/* ============================================================
   Light mode: hero + teaser become warm light panels (matches the
   GraphDO page). Image/figure stages stay dark, like GraphDO's graph stages.
   ============================================================ */
[data-theme="light"] .hero{
  background:radial-gradient(ellipse 92% 72% at 50% 16%,#fdfaf5 0%,#f4ecdf 52%,#e8d8c2 100%);
  color:var(--fg);
}
[data-theme="light"] .hero__vign{background:radial-gradient(ellipse at center,transparent 56%,rgba(120,86,52,.10) 100%)}
[data-theme="light"] .hero h1{color:#1f1a14}
[data-theme="light"] .hero__sub{color:var(--muted)}
[data-theme="light"] .hero__authors{color:#4a4036}
[data-theme="light"] .hero__authors a{color:#4a4036}
[data-theme="light"] .hero__authors a:hover{color:var(--accent)}
[data-theme="light"] .hero__aff{color:#8a7d6c}
[data-theme="light"] .hero__corr{color:#9b8f80}
[data-theme="light"] .scrollcue{color:#8a7d6c}
[data-theme="light"] .btn{border-color:var(--line);color:var(--fg);background:color-mix(in srgb,var(--card) 55%,transparent)}
[data-theme="light"] .btn:hover{background:var(--accent);border-color:var(--accent);color:#fff}
[data-theme="light"] .btn--solid{background:var(--accent);border-color:var(--accent);color:#fff}
[data-theme="light"] .btn--solid:hover{background:var(--accent2);border-color:var(--accent2);color:#fff}
[data-theme="light"] .nav:not(.solid) .nav__brand,
[data-theme="light"] .nav:not(.solid) .nav__links a,
[data-theme="light"] .nav:not(.solid) .icon-btn{color:var(--fg)}
[data-theme="light"] .nav:not(.solid) .icon-btn{border-color:var(--line)}
[data-theme="light"] .nav:not(.solid) .nav__links a:hover,
[data-theme="light"] .nav:not(.solid) .nav__links a.active{color:var(--accent)}
[data-theme="light"] .nav:not(.solid) .icon-btn:hover{border-color:var(--accent);color:var(--accent)}
/* teaser band + compare captions */
[data-theme="light"] .teaser{background:radial-gradient(ellipse 110% 130% at 50% 0%,#f8f0e3 0%,#efe2cf 60%,#e7d9c2 100%);color:var(--fg)}
[data-theme="light"] .teaser p{color:var(--muted)}
[data-theme="light"] .teaser p strong{color:var(--accent)}
[data-theme="light"] .compare{border-color:var(--line)}
[data-theme="light"] .compare-cap{color:var(--muted)}
[data-theme="light"] .compare-cap .cq{color:var(--fg)}

/* ============================================================
   Prism-Δ additions
   ============================================================ */
.channels{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:44px}
.chan{border:1px solid var(--line);background:var(--card);padding:28px 26px;position:relative;overflow:hidden;transition:border-color .3s,transform .3s}
.chan:hover{border-color:var(--accent);transform:translateY(-4px)}
.chan::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent2))}
.chan--v::before{background:linear-gradient(90deg,#37c6e0,#0a84ff,#bf5af0)}
.chan .tagk{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.2em;text-transform:uppercase;color:var(--accent)}
.chan--v .tagk{color:#0a84ff}
[data-theme="dark"] .chan--v .tagk{color:#5ab0ff}
.chan h3{font-family:var(--ff-display);margin:10px 0 8px;font-size:1.011rem;font-weight:600;letter-spacing:-.01em}
.chan p{color:var(--muted);font-size:.921rem;margin:0;line-height:1.65}
@media(max-width:780px){.channels{grid-template-columns:1fr}}

.three{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:42px}
.three .figure{margin:0}
.three .figure img{background:#fff}
@media(max-width:780px){.three{grid-template-columns:1fr}}

/* keep result stat value on one line even with fraction/suffix */
.stat__v{display:flex;align-items:baseline;gap:2px;flex-wrap:wrap}

/* ============================================================
   Prism-Δ · native interactive visualizations
   ============================================================ */
.viz{border:1px solid var(--line);background:var(--card);padding:20px 20px 18px}
.viz--wide{margin-top:40px}
.viz__head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;flex-wrap:wrap}
.viz__t{font-family:var(--ff-display);font-weight:600;font-size:1rem;letter-spacing:-.01em}
.viz__hint{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);display:inline-flex;align-items:center;gap:5px}
.viz__cv{width:100%;display:block;cursor:crosshair}
.viz__cv--sq{width:360px;max-width:100%;height:360px;margin:0 auto;cursor:crosshair}
.viz__cap{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.02em;color:var(--muted);line-height:1.6;margin-top:12px;border-top:1px solid var(--line);padding-top:12px}
.viz__sub{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);text-align:center;margin-top:6px}
.viz__grad{display:flex;align-items:center;gap:8px;margin-top:8px;font-family:var(--ff-mono);font-size:.737rem;color:var(--muted)}
.viz__grad i{flex:1;height:8px;background:linear-gradient(90deg,#440154,#3b528b,#21918c,#5ec962,#fde725)}
.lg{width:11px;height:11px;display:inline-block;border-radius:2px;vertical-align:-1px}
.lg--k{background:#3E7CB1}.lg--v{background:#c9673d}.lg--pos{background:#d9534f}.lg--diff{background:#3E7CB1}
.viz__toggle{display:inline-flex;gap:6px}
.viz__toggle button{font-family:var(--ff-mono);font-size:.789rem;padding:5px 12px;border:1px solid var(--line);background:transparent;color:var(--muted);cursor:pointer;transition:all .2s}
.viz__toggle button:hover{border-color:var(--accent);color:var(--accent)}
.viz__toggle button.on{background:var(--accent);border-color:var(--accent);color:#fff}
[data-theme="dark"] .viz__toggle button.on{color:#1a120c}
.viz__projrow{display:grid;grid-template-columns:360px 1fr;gap:22px;align-items:center}
@media(max-width:700px){.viz__projrow{grid-template-columns:1fr}}
.viz__projinfo .pk{font-family:var(--ff-display);font-weight:600;font-size:1rem;margin-bottom:10px}
.viz__projinfo .pv{font-family:var(--ff-mono);font-size:.842rem;color:var(--muted);margin-bottom:4px}
.viz__projinfo .pv b{color:var(--accent)}
.viz__projinfo .pnote{font-size:.842rem;color:var(--muted);margin-top:12px;line-height:1.6}
.viz__legend{display:flex;flex-wrap:wrap;gap:16px;margin-top:12px;font-family:var(--ff-mono);font-size:.737rem;color:var(--muted)}
.viz__legend span{display:inline-flex;align-items:center;gap:6px}
.viz__legend i{width:14px;height:3px;display:inline-block}
.viz__tip{position:fixed;z-index:9999;pointer-events:none;opacity:0;transition:opacity .12s;
  background:#0c0805;color:#f3ece2;border:1px solid rgba(255,255,255,.16);padding:8px 11px;
  font-family:var(--ff-mono);font-size:.789rem;line-height:1.5;max-width:240px;box-shadow:0 8px 30px rgba(0,0,0,.4)}
.viz__tip b{color:#fff;display:block;margin-bottom:3px}

/* ---------- native pipeline (overview) ---------- */
.pipeline{margin-top:44px;border:1px solid var(--line);background:var(--card);padding:26px 24px 0;position:relative;overflow:hidden}
.pipeline__phase{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.2em;text-transform:uppercase;color:var(--accent);margin-bottom:18px}
.pipeline__flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:stretch;gap:8px}
.pnode{border:1px solid var(--line);background:var(--bg);padding:18px 18px 16px;display:flex;flex-direction:column}
.pnode--out{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent-soft)}
.pnode__k{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.pnode p{font-size:.842rem;color:var(--muted);margin:12px 0 0;line-height:1.55}
.pon{background:var(--accent);color:#fff;padding:1px 6px;font-size:.85em;margin-left:4px}
[data-theme="dark"] .pon{color:#1a120c}
.pchips{display:flex;gap:6px;flex-wrap:wrap}
.pchips span{font-family:var(--ff-mono);font-size:.842rem;padding:4px 10px;border:1px solid var(--line)}
.pchips .pl{color:#3aa76d;border-color:rgba(58,167,109,.5)}.pchips .mi{color:#d9534f;border-color:rgba(217,83,79,.5)}
.pform{font-family:var(--ff-mono);font-size:.921rem;color:var(--fg);background:var(--accent-soft);padding:8px 12px;margin-bottom:8px}
.pform--v{color:var(--accent)}
.psvd{font-size:.737rem;letter-spacing:.1em;background:var(--accent);color:#fff;padding:2px 7px;margin-left:6px;vertical-align:middle}
[data-theme="dark"] .psvd{color:#1a120c}
.parrow{display:grid;place-items:center;color:var(--accent);font-size:1.179rem;opacity:.7}
.pipeline__spectrum{height:5px;margin:24px -24px 0;background:linear-gradient(90deg,#ff2d55,#ff8f1f,#ffd60a,#30d158,#37c6e0,#0a84ff,#bf5af0)}
@media(max-width:820px){
  .pipeline__flow{grid-template-columns:1fr}
  .parrow{transform:rotate(90deg);padding:4px 0}
}

/* ---------- highlighting demo ---------- */
.demo{border:1px solid var(--line);background:var(--card);padding:24px}
.demo__bar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:20px}
.demo__nav{display:flex;gap:6px;flex-wrap:wrap}
.demo__nav button{width:28px;height:28px;border:1px solid var(--line);background:transparent;color:var(--muted);font-family:var(--ff-mono);font-size:.789rem;cursor:pointer;transition:all .2s}
.demo__nav button:hover{border-color:var(--accent);color:var(--accent)}
.demo__nav button.on{background:var(--accent);border-color:var(--accent);color:#fff}
[data-theme="dark"] .demo__nav button.on{color:#1a120c}
.demo__about{font-family:var(--ff-mono);font-size:.789rem;letter-spacing:.02em;color:var(--muted);line-height:1.6;margin-bottom:18px;padding-bottom:16px;border-bottom:1px dashed var(--line)}
.demo__lab{font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.demo__ctx{font-family:var(--ff-display);font-size:clamp(1rem,2.5vw,1.432rem);line-height:1.95;letter-spacing:-.01em}
.tok{padding:1px 3px;border-radius:3px;transition:opacity .35s ease,background .35s ease,box-shadow .35s ease,color .35s ease}
.demo.on .tok:not(.hl){opacity:.42}
.tok.hl{position:relative}
.demo.on .tok.hl{
  background:linear-gradient(90deg,rgba(255,45,85,.24),rgba(255,143,31,.24),rgba(255,214,10,.24),rgba(48,209,88,.24),rgba(55,198,224,.24),rgba(10,132,255,.24),rgba(191,90,240,.24));
  box-shadow:inset 0 -3px 0 var(--accent);color:var(--fg)}
.demo__note{font-family:var(--ff-mono);font-size:.789rem;color:var(--muted);margin-top:22px;border-top:1px solid var(--line);padding-top:16px;line-height:1.6}
.demo__note b{color:var(--accent)}

/* ---------- case-explorer verdict ---------- */
.demo__verdict{display:flex;flex-wrap:wrap;align-items:stretch;gap:14px;margin-top:24px}
.demo__verdict .ans{flex:1 1 220px;max-width:none}
.demo__to{display:grid;place-items:center;font-family:var(--ff-mono);font-size:.737rem;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);padding:0 4px}
.demo.off #demoGoodBox{opacity:.32;filter:grayscale(.5);transition:opacity .3s,filter .3s}
.demo__tabs button{text-transform:none;letter-spacing:.02em}
#demoTabs{flex-wrap:wrap}
@media(max-width:640px){.demo__verdict{flex-direction:column}.demo__to{transform:rotate(90deg);padding:2px 0}}