/* LeWi project page. One light and one dark theme from the tokens below; the reader's system setting picks it. */

:root {
  --paper: #f7f8fa;
  --paper-2: #eff1f5;
  --panel: #ffffff;
  --ink: #1d222b;
  --ink-2: #474f5e;
  --muted: #707888;
  --faint: #9ba2ae;
  --hair: #e1e4ea;
  --hair-2: #eaedf1;
  --lewi: #f26b1d;
  --lewi-text: #b0500f;
  --lewi-wash: rgba(242, 107, 29, 0.15);
  --lewi-glow: rgba(242, 107, 29, 0.07);
  --blue-glow: rgba(0, 114, 178, 0.06);
  --sheet-alpha-w: 0.1;
  --sheet-alpha-c: 0.085;
  --on-lewi: #1f0d03;
  --dense: #23272f;
  --oracle: #1f7a45;
  --oracle-2: #3f9360;
  --oracle-1: #63ad7d;
  --base: #a7adb8;
  --leaf: #e2e0d9;
  --leaf-edge: #ffffff;
  --func: #2b5fac;
  --readout: #79a884;
  --gedge: #5a5955;
  --wm-mid: #f7f7f7;
  --wm-neg: #2166ac;
  --wm-pos: #b2182b;
  --dot: rgba(29, 34, 43, 0.075);
  --tip-bg: #1d222b;
  --tip-ink: #f2f4f7;
  --tip-dim: #a3abb8;
  --shadow: 0 1px 2px rgba(29, 34, 43, 0.05), 0 16px 36px -18px rgba(29, 34, 43, 0.22);
  /* the 3-D views and the target graphs (read by the script) */
  --v3-cube: rgba(29, 34, 43, 0.1);
  --v3-out: #1d222b;
  --v3-outline: rgba(255, 255, 255, 0.92);
  --v3-dim: #b9bec7;
  --v3-edge-dim: 125, 133, 147;
  --v3-gain: 1.25;
  --v3-track: rgba(29, 34, 43, 0.2);
  --tg-edge: rgba(29, 34, 43, 0.32);
  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: var(--serif);
  --mono: var(--serif);
  --wrap: 1180px;
  --pad: clamp(1rem, 4vw, 2.5rem);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #101318; --paper-2: #141820; --panel: #181d26;
    --ink: #e2e6ec; --ink-2: #b2bac7; --muted: #8a93a2; --faint: #636c7b; --hair: #283040; --hair-2: #1e2430;
    --lewi: #ff7a2e; --lewi-text: #ff9a5c; --lewi-wash: rgba(255, 122, 46, 0.2); --lewi-glow: rgba(255, 122, 46, 0.07);
    --blue-glow: rgba(64, 150, 220, 0.06); --on-lewi: #1f0d03;
    --sheet-alpha-w: 0.085; --sheet-alpha-c: 0.08;
    --dense: #e2e6ec; --oracle: #4cb57c; --oracle-2: #6cc292; --oracle-1: #8fd0aa; --base: #5f6878;
    --leaf: #3b4250; --leaf-edge: #181d26; --func: #4f82d0; --readout: #79a884; --gedge: #8b94a3;
    --wm-mid: #1c222c; --wm-neg: #3d8fd1; --wm-pos: #e0505e;
    --dot: rgba(226, 230, 236, 0.06); --tip-bg: #262d3a; --tip-ink: #eef1f5; --tip-dim: #9aa3b2;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 16px 36px -18px rgba(0, 0, 0, 0.6);
    --v3-cube: rgba(226, 230, 236, 0.08); --v3-out: #e2e6ec; --v3-outline: rgba(16, 19, 24, 0.85); --v3-dim: #586170;
    --v3-edge-dim: 150, 160, 176; --v3-gain: 1; --v3-track: rgba(226, 230, 236, 0.22); --tg-edge: rgba(226, 230, 236, 0.3);
    color-scheme: dark;
  }
}

/* ------------------------------------------------------------------ base */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 1.5rem; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; color: var(--ink);
  background-color: var(--paper);
  font: 400 1.1875rem/1.62 var(--serif); font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility;
  font-variant-numeric: lining-nums;
  transition: background-color 0.25s, color 0.25s;
}
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: linear-gradient(to bottom left, var(--sheet-w, rgba(242, 107, 29, 0.1)) 0%, transparent 48%, transparent 52%, var(--sheet-c, rgba(0, 114, 178, 0.085)) 100%);
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; }
p { margin: 0 0 1em; }
b, strong { font-weight: 600; }
sub, sup { line-height: 0; font-size: 0.72em; }
:focus-visible { outline: 2px solid var(--lewi); outline-offset: 3px; border-radius: 4px; }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -9999px; top: 0; }
.skip:focus { left: 1rem; top: 1rem; z-index: 100; background: var(--panel); color: var(--ink); padding: 0.5rem 0.9rem; font: 500 0.9rem var(--sans); }

.wrap { max-width: calc(var(--wrap) + 2 * var(--pad)); margin: 0 auto; padding: 0 var(--pad); }
.band { padding: clamp(4.5rem, 2.5rem + 6vw, 7.5rem) 0; position: relative; }
.band-alt { background: transparent; }

h2 { font: 400 clamp(2rem, 1.35rem + 2.1vw, 2.85rem)/1.1 var(--serif); font-variation-settings: "opsz" 72; letter-spacing: -0.02em; margin: 0 0 1.1rem; text-wrap: balance; color: var(--ink); }
h3 { text-wrap: balance; }
.sec-head { margin: 0 0 3.2rem; }
.sec-lede { max-width: 47rem; font-size: 1.22rem; line-height: 1.6; color: var(--ink-2); margin: 0; }
.sec-lede b { color: var(--ink); font-weight: 600; }

.katex { font-size: 1.06em; }
.katex-display { margin: 0.5rem 0 0.7rem; text-align: left; overflow-x: auto; overflow-y: hidden; padding: 0.15rem 0 0.3rem; }
.katex-display > .katex { text-align: left; }

/* ------------------------------------------------------------------ buttons */


.actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.62rem 0.95rem; border-radius: 9px;
  border: 1px solid var(--hair); background: var(--panel); color: var(--ink);
  font: 500 0.95rem/1 var(--sans); text-decoration: none;
  transition: background 0.16s, border-color 0.16s, transform 0.16s, box-shadow 0.16s;
}
.btn svg { width: 1.12em; height: 1.12em; }
button.btn { cursor: pointer; }
.btn:hover { border-color: var(--faint); box-shadow: 0 6px 16px -10px rgba(0, 0, 0, 0.35); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--lewi); border-color: var(--lewi); color: var(--on-lewi); }
.btn-primary:hover { background: #ff8340; border-color: #ff8340; }
.btn .meta { font: 400 0.74rem/1 var(--mono); opacity: 0.72; margin-left: 0.15rem; }
.btn-soon { cursor: default; color: var(--muted); }
.btn-soon:hover { border-color: var(--hair); box-shadow: none; }
.soon { font: 500 0.64rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; padding: 0.28rem 0.42rem; border-radius: 5px; background: var(--paper-2); color: var(--muted); border: 1px solid var(--hair); }


/* ------------------------------------------------------------------ hero */

.hero { position: relative; background: transparent; color: var(--ink); overflow: hidden; isolation: isolate; }
.hero-grid {
  max-width: 1340px; margin: 0 auto; padding: clamp(4rem, 2rem + 6vh, 6.5rem) var(--pad) clamp(3rem, 2rem + 4vh, 5rem);
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: clamp(2rem, 4.5vw, 5rem); align-items: center;
  min-height: min(100svh, 920px);
}
.title { font: 380 clamp(2.3rem, 1.25rem + 2.6vw, 3.6rem)/1.06 var(--serif); font-variation-settings: "opsz" 72; letter-spacing: -0.022em; margin: 0 0 1.4rem; text-wrap: balance; color: var(--ink); }
.tldr { font: 400 clamp(1.14rem, 1rem + 0.4vw, 1.32rem)/1.55 var(--serif); color: var(--ink-2); max-width: 33rem; margin: 0 0 2rem; }
.byline { margin: 0 0 1.9rem; font-family: var(--sans); }
.authors { font: 500 1.02rem/1.6 var(--sans); margin: 0 0 0.15rem; color: var(--ink); }
.authors a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--hair); }
.authors a:hover { border-bottom-color: var(--lewi); }
.authors .au { color: var(--ink); }
.authors sup, .affils sup { color: var(--muted); margin-left: 0.1em; }
.affils { font: 400 0.92rem/1.5 var(--sans); color: var(--muted); margin: 0; }

.hero-visual { position: relative; margin: 0; min-width: 0; }
.hero-visual canvas { display: block; width: 100%; aspect-ratio: 1 / 0.94; cursor: grab; touch-action: pan-y; }
.hero-visual canvas.dragging { cursor: grabbing; }
.hv-target { position: absolute; right: 0.85rem; top: 0.75rem; width: 132px; pointer-events: none; text-align: right; }
.hv-target-label { display: block; font: 500 0.64rem/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin: 0.2rem 0 0.35rem; }
.hv-target svg { width: 100%; height: auto; }
.hero-visual figcaption { font: 400 0.84rem/1.55 var(--sans); color: var(--muted); margin: 1rem 0 0; max-width: 42rem; }

.js .hero-copy > *, .js .hero-visual { animation: rise 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) both; }
.js .hero-copy > :nth-child(1) { animation-delay: 0.05s; }
.js .hero-copy > :nth-child(2) { animation-delay: 0.14s; }
.js .hero-copy > :nth-child(3) { animation-delay: 0.26s; }
.js .hero-copy > :nth-child(4) { animation-delay: 0.36s; }
.js .hero-copy > :nth-child(5) { animation-delay: 0.44s; }
.js .hero-visual { animation-delay: 0.3s; animation-duration: 1.2s; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }


.chip { font: 500 0.8rem/1 var(--sans); color: var(--ink); background: var(--panel); border: 1px solid var(--hair); border-radius: 999px; padding: 0.5rem 0.9rem; cursor: pointer; white-space: nowrap; transition: border-color 0.15s, background 0.15s; }
.chip:hover { border-color: var(--faint); }

/* ------------------------------------------------------------------ segmented switch */

.seg { display: inline-flex; gap: 0.2rem; padding: 0.2rem; border: 1px solid var(--hair); border-radius: 10px; background: var(--panel); margin: 0 0 1.4rem; }
.seg-b { font: 500 0.86rem/1 var(--sans); color: var(--muted); background: transparent; border: 0; border-radius: 7px; padding: 0.55rem 0.9rem; cursor: pointer; transition: color 0.15s, background 0.15s; }
.seg-b:hover { color: var(--ink); }
.seg-b[aria-selected="true"] { color: var(--ink); background: var(--paper-2); }

/* ------------------------------------------------------------------ motivation: one function, seven pieces */

.pieces-fig { margin: 0; max-width: 860px; }
#pieces-svg { width: 100%; height: auto; overflow: visible; }
.pc-in { fill: var(--leaf); stroke: var(--faint); stroke-width: 1; }
.pc-out { fill: var(--ink); }
.pc-lab { font: italic 400 15px var(--serif); fill: var(--ink-2); }
.pc-wire { stroke: var(--faint); stroke-width: 1.5; fill: none; }
.pc-box { fill: var(--paper-2); stroke: var(--hair); stroke-width: 1.3; }
.pc-f { font: italic 400 30px var(--serif); fill: var(--ink); }
.pc-frame { fill: none; stroke: var(--hair); stroke-width: 1.3; stroke-dasharray: 5 4; }
.pc-lvl { font: 400 12px var(--sans); fill: var(--muted); }
.pc-g { transition: opacity 0.6s ease; }
#pieces-svg .pc-pieces { opacity: 0; }
#pieces-svg.show-pieces .pc-pieces { opacity: 1; }
#pieces-svg.show-pieces .pc-whole { opacity: 0; }
.counts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem 2.5rem; max-width: 860px; margin: 1.8rem 0 0; }
.count { padding-top: 1rem; border-top: 2px solid var(--hair); transition: border-color 0.4s, opacity 0.4s; opacity: 0.55; }
.count.on { border-top-color: var(--lewi); opacity: 1; }
.count-n { display: block; font: 400 clamp(2.2rem, 1.6rem + 2vw, 3.2rem)/1 var(--serif); font-variation-settings: "opsz" 72; letter-spacing: -0.03em; color: var(--ink); font-variant-numeric: tabular-nums; }
.count-k { display: block; font: 400 0.92rem/1.45 var(--sans); color: var(--ink-2); margin-top: 0.5rem; }

/* ------------------------------------------------------------------ the gap */

.gap-fig { margin: 0; max-width: 860px; }
#gap-svg { width: 100%; height: auto; overflow: visible; }
.gp-t { font: 400 12px var(--mono); fill: var(--muted); }
.gp-axt { font: 500 13px var(--sans); fill: var(--ink-2); }
.gp-g { stroke: var(--hair-2); stroke-width: 1; }
.gp-a { stroke: var(--ink-2); stroke-width: 1.2; }
.gp-fill { fill: var(--oracle); opacity: 0.16; }
.gp-base { fill: none; stroke: var(--base); stroke-width: 1.4; }
.gp-dense { fill: none; stroke: var(--dense); stroke-width: 3.2; stroke-linejoin: round; }
.gp-oracle { fill: none; stroke: var(--oracle); stroke-width: 3; stroke-dasharray: 9 6; }
.gp-lewi { fill: none; stroke: var(--lewi); stroke-width: 3.4; stroke-linejoin: round; }
.gp-dot-d { fill: var(--dense); }
.gp-dot-o { fill: var(--oracle); }
.gp-dot-l { fill: var(--lewi); }
.gp-leg { font: 400 14px var(--sans); fill: var(--ink); }
.gp-leg-k { font: 400 12px var(--sans); fill: var(--muted); }
.gp-note { font: 600 17px var(--sans); fill: var(--lewi-text); }
.gp-note2 { font: 400 13px var(--sans); fill: var(--muted); }
.gp-lewi-g { transition: opacity 0.5s; }
#gap-svg:not(.with-lewi) .gp-lewi-g { opacity: 0; }

/* ------------------------------------------------------------------ how it works: four steps */

.st-track { position: relative; }
.st-head { margin-bottom: 1.5rem; }
.stepper { max-width: 1060px; position: sticky; top: 16px; }
.st-tabs { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0 0 1.2rem; }
.st-tab { position: relative; overflow: hidden; display: inline-flex; align-items: center; gap: 0.55rem; font: 500 0.9rem/1 var(--sans); color: var(--muted); background: var(--panel); border: 1px solid var(--hair); border-radius: 10px; padding: 0.6rem 0.9rem; cursor: pointer; }
.st-tab span:first-child { display: grid; place-items: center; width: 1.45rem; height: 1.45rem; border-radius: 50%; font: 500 0.74rem/1 var(--mono); border: 1px solid var(--hair); color: var(--muted); }
.st-tab[aria-selected="true"] { color: var(--ink); border-color: var(--faint); }
.st-tab[aria-selected="true"] span:first-child { background: var(--lewi); border-color: var(--lewi); color: var(--on-lewi); }
.st-tab .st-tl { white-space: nowrap; }
.st-body { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: clamp(1.5rem, 3vw, 3rem); align-items: start; }
.st-stage { margin: 0; background: var(--panel); border: 1px solid var(--hair); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; }
#stepper-svg { width: 100%; height: auto; touch-action: none; user-select: none; -webkit-user-select: none; }
.st-math { list-style: none; margin: 0; padding: 0.4rem 0 0; display: grid; gap: 1.1rem; }
.st-math li { transition: opacity 0.4s, transform 0.4s; }
.st-math li.later { opacity: 0; transform: translateY(6px); }
.st-math li.past { opacity: 0.42; }
.st-math li.key .katex-display { display: inline-block; border: 1px solid var(--hair); border-radius: 10px; padding: 0.35rem 0.7rem; background: var(--panel); }
.st-math .katex-display { margin: 0 0 0.25rem; padding: 0; overflow: visible; }
.st-math .katex { font-size: 1.32em; }
.st-math .cap { display: block; font: 400 1rem/1.45 var(--serif); color: var(--muted); }
.st-math .cap .katex { font-size: 1em; }
.sv-field { fill: var(--panel); }
.sv-n { fill: var(--faint); stroke: var(--panel); stroke-width: 2; }
.sv-o { fill: var(--hair); stroke: var(--panel); stroke-width: 2; }
.sv-e { fill: var(--ink); stroke: var(--panel); stroke-width: 2.5; }
.sv-ring { fill: none; stroke: var(--ink-2); stroke-width: 1.6; }
.sv-r { fill: url(#svShade); stroke: var(--ink-2); stroke-width: 1.6; stroke-dasharray: 7 6; }
.sv-rl { stroke: var(--ink); stroke-width: 1.4; }
.sv-link { stroke: var(--ink-2); stroke-linecap: round; }
.sv-gone { stroke: var(--faint); stroke-width: 1.6; stroke-dasharray: 2 5; }
.sv-lab { font: italic 400 22px var(--serif); fill: var(--ink); }
.sv-pull { stroke: var(--lewi); fill: none; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.sv-push { stroke: #3a7fd5; fill: none; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.sv-pull-t { font: 400 19px var(--serif); fill: var(--lewi-text); }
.sv-push-t { font: 400 19px var(--serif); fill: #3a7fd5; }
.sv-dense { stroke: var(--faint); stroke-width: 1.1; }

/* ------------------------------------------------------------------ results pattern */

.pattern-fig { margin: 0; max-width: 1000px; }
#pattern-svg { width: 100%; height: auto; overflow: visible; }
.pt-row { font: 400 17px var(--serif); fill: var(--ink); }
.pt-t { font: 400 13px var(--mono); fill: var(--muted); font-variant-numeric: tabular-nums; }
.pt-ax { font: 400 13px var(--sans); fill: var(--muted); }
.pt-g { stroke: var(--hair-2); stroke-width: 1; }
.pt-band { fill: var(--oracle); opacity: 0.12; }
.pt-pct { font: 600 19px var(--sans); fill: var(--lewi-text); }
.pt-vs { font: 400 14px var(--sans); fill: var(--muted); }
.pt-note { font: 400 15px var(--sans); fill: var(--ink-2); }
.pt-leg { font: 400 14px var(--sans); fill: var(--ink); }
.pt-ic-e { stroke: var(--gedge); stroke-width: 0.9; }
.pt-ic-in { fill: var(--leaf); }
.pt-ic-fn { fill: var(--ink-2); }
.pt-ic-out { fill: var(--ink); }

/* ------------------------------------------------------------------ world-model tasks */

.tip-clip { display: block; width: 168px; height: 168px; border-radius: 6px; margin: 0.4rem 0 0.2rem; }

/* ------------------------------------------------------------------ CSFRBench */

.bench-flow { display: grid; grid-template-columns: minmax(0, 1fr) 56px minmax(0, 1fr) 56px minmax(0, 1fr); align-items: stretch; }
.bf-card { margin: 0; background: var(--panel); border: 1px solid var(--hair); border-radius: 16px; box-shadow: var(--shadow); padding: 1.2rem 1.3rem 1.1rem; display: flex; flex-direction: column; gap: 1rem; }
.bf-card svg { width: 100%; height: 190px; }
.bf-card figcaption b { display: block; font: 500 1.15rem/1.3 var(--serif); color: var(--ink); }
.bf-card figcaption span { display: block; font: 400 0.98rem/1.45 var(--serif); color: var(--muted); }
.bf-hidden { border-style: dashed; border-color: var(--faint); background: color-mix(in srgb, var(--panel) 70%, var(--paper-2)); }
.bf-arrow { display: grid; place-items: center; }
.bf-arrow svg { width: 40px; height: 16px; }
.bf-arrow path { fill: none; stroke: var(--faint); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.bx-h { font: italic 400 15px var(--serif); fill: var(--muted); }
.bx-in { fill: var(--ink); }
.bx-out { fill: var(--ink); stroke: var(--ink); stroke-width: 1.2; }
.bx-arrow { fill: none; stroke: var(--faint); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.bl-e line { stroke: var(--faint); stroke-width: 0.6; stroke-opacity: 0.55; }
.bl-n { fill: var(--base); stroke: var(--panel); stroke-width: 1.5; }
.bl-out { fill: var(--ink); stroke: var(--panel); stroke-width: 1.5; }
.bench-graphs { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 0.8rem; margin-top: 1.6rem; }
.bg-card { margin: 0; text-align: center; }
.bg-card svg { width: 100%; height: auto; display: block; margin: 0 auto 0.5rem; max-width: 170px; }
.bg-card b { display: block; font: 500 1rem/1.3 var(--serif); color: var(--ink); }
.bg-card span { display: block; font: 400 0.9rem/1.35 var(--serif); color: var(--muted); }
.bg-e line { stroke: var(--gedge); stroke-width: 1; stroke-opacity: 0.7; }
.bg-input { fill: var(--leaf); stroke: var(--gedge); stroke-width: 0.8; }
.bg-function { fill: var(--func); }
.bg-readout { fill: var(--readout); }
@media (max-width: 860px) {
  .bench-flow { grid-template-columns: minmax(0, 1fr); gap: 0.2rem; }
  .bf-arrow { height: 40px; }
  .bf-arrow svg { transform: rotate(90deg); }
  .bench-graphs { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 1.4rem; }
}

/* ------------------------------------------------------------------ alignment results */

.align-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 1.25rem; }
.align-card { margin: 0; background: var(--panel); border: 1px solid var(--hair); border-radius: 14px; padding: 1rem 1.15rem 0.7rem; box-shadow: var(--shadow); }
.align-card figcaption { margin: 0 0 0.75rem; }
.align-card figcaption b { display: block; font: 500 1.12rem/1.3 var(--serif); color: var(--ink); }
.align-card figcaption span { display: block; font: 400 0.9rem/1.4 var(--serif); color: var(--muted); }
.align-card svg { width: 100%; height: auto; }
.al-row { font: 400 15px var(--serif); fill: var(--ink); }
.al-leg { font: 400 13.5px var(--serif); fill: var(--ink-2); }
@media (max-width: 980px) { .align-row { grid-template-columns: minmax(0, 1fr); } }

/* ------------------------------------------------------------------ gallery */

.gallery { background: var(--panel); color: var(--ink); border-radius: 18px; overflow: hidden; border: 1px solid var(--hair); box-shadow: var(--shadow); }
.gallery-tabs { display: flex; flex-wrap: wrap; gap: 0.35rem; padding: 0.75rem; border-bottom: 1px solid var(--hair); }
.tab { font: 500 0.88rem/1 var(--sans); color: var(--muted); background: transparent; border: 1px solid transparent; padding: 0.55rem 0.9rem; border-radius: 9px; cursor: pointer; transition: color 0.15s, background 0.15s; }
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { color: var(--ink); background: var(--paper-2); border-color: var(--hair); }
.gallery-body { display: grid; grid-template-columns: minmax(0, 1fr) 300px; }
.gallery-stage { position: relative; min-height: 420px; aspect-ratio: 16 / 10.5; background: var(--panel); }
.gallery-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; cursor: grab; touch-action: pan-y; }
.gallery-hint { top: 0.85rem; bottom: auto; }
.gallery-layers { position: absolute; left: 0.75rem; right: 0.75rem; bottom: 0.7rem; display: flex; gap: 0.3rem; overflow-x: auto; scrollbar-width: none; padding: 0.1rem; }
.gallery-layers::-webkit-scrollbar { display: none; }
.gallery-layers .lay { flex: none; font: 500 0.72rem/1 var(--mono); color: var(--muted); background: color-mix(in srgb, var(--panel) 85%, transparent); border: 1px solid var(--hair); border-radius: 7px; padding: 0.42rem 0.6rem; cursor: pointer; -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.gallery-layers .lay:hover { color: var(--ink); }
.gallery-layers .lay[aria-pressed="true"] { color: var(--on-lewi); background: var(--lewi); border-color: var(--lewi); }
.gallery-side { padding: 1.3rem 1.4rem 1.5rem; border-left: 1px solid var(--hair); font: 400 0.88rem/1.55 var(--sans); color: var(--muted); display: flex; flex-direction: column; background: color-mix(in srgb, var(--paper-2) 55%, var(--panel)); }
.side-k { font: 500 0.66rem/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin: 0 0 0.7rem; }
#gallery-target { width: 100%; height: auto; margin: 0 0 1.4rem; }
.gallery-note { color: var(--ink-2); margin: 0 0 1rem; }
.gallery-side .btn-demo { margin-top: auto; align-self: flex-start; }
.tg-e { stroke: var(--tg-edge); }
.tg-n { stroke: var(--panel); stroke-width: 1.2; }
.tg-out { fill: var(--v3-out); stroke: var(--panel); stroke-width: 1.2; }

/* ------------------------------------------------------------------ world models */

.wm-scroll { overflow-x: auto; margin: 0 calc(-1 * var(--pad)); padding: 0 var(--pad); }
.wm svg { width: 100%; min-width: 780px; height: auto; overflow: visible; }
.wm-row { font: 500 12.5px var(--sans); fill: var(--ink); }
.wm-task { font: 400 11.5px var(--sans); fill: var(--ink-2); cursor: default; }
.wm-task:hover { fill: var(--lewi-text); }
.wm-group { font: 500 10.5px var(--mono); letter-spacing: 0.1em; fill: var(--muted); }
.wm-cell { stroke: var(--paper-2); stroke-width: 1.5; cursor: default; }
.wm-cell:hover { stroke: var(--ink); stroke-width: 1.5; }
.wm-tie { fill: none; stroke: var(--ink); stroke-width: 1.1; pointer-events: none; }
.wm-scale-t { font: 400 11.5px var(--mono); fill: var(--muted); font-variant-numeric: tabular-nums; }
.wm-scale-tick { stroke: var(--faint); stroke-width: 1; }
.wm-scale-k { font: 400 10.5px var(--sans); fill: var(--muted); }


/* ------------------------------------------------------------------ the BibTeX dialog */

.bib-dlg { width: min(680px, calc(100vw - 2rem)); max-width: none; padding: 0; border: 1px solid var(--hair); border-radius: 14px; background: var(--panel); color: var(--ink); box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.55); }
.bib-dlg::backdrop { background: rgba(12, 15, 20, 0.42); -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px); }
.bib-dlg-head { display: flex; align-items: center; gap: 0.6rem; padding: 0.7rem 0.7rem 0.7rem 1.3rem; border-bottom: 1px solid var(--hair); }
.bib-dlg-h { flex: 1; margin: 0; font: 600 0.95rem/1 var(--sans); color: var(--ink); }
.bib-x { display: grid; place-items: center; width: 2.1rem; height: 2.1rem; padding: 0; border-radius: 8px; border: 1px solid transparent; background: transparent; color: var(--muted); cursor: pointer; }
.bib-x:hover { color: var(--ink); border-color: var(--hair); }
.bib-x svg { width: 1.1rem; height: 1.1rem; }
.bib-dlg pre { font: 400 0.8rem/1.7 var(--mono); color: var(--ink-2); margin: 0; padding: 1.1rem 1.3rem 1.3rem; overflow-x: auto; white-space: pre; }
.chip-copy.done { border-color: var(--oracle); color: var(--oracle); }

/* ------------------------------------------------------------------ tooltip */

.tip { position: fixed; left: 0; top: 0; z-index: 70; pointer-events: none; max-width: 270px; background: var(--tip-bg); color: var(--tip-ink); font: 400 0.78rem/1.45 var(--sans); padding: 0.6rem 0.75rem; border-radius: 9px; box-shadow: 0 14px 34px -12px rgba(0, 0, 0, 0.45); opacity: 0; transform: translateY(4px); transition: opacity 0.12s, transform 0.12s; }
.tip.on { opacity: 1; transform: none; }
.tip b { font-weight: 600; }
.tip .tt-h { font: 600 0.8rem/1.3 var(--sans); margin-bottom: 0.3rem; }
.tip .tt-r { display: flex; justify-content: space-between; gap: 1rem; font-variant-numeric: tabular-nums; }
.tip .tt-r span:last-child { font-family: var(--mono); font-size: 0.74rem; }
.tip .sw { display: inline-block; width: 8px; height: 8px; border-radius: 2px; margin-right: 0.4rem; }
.tip .tt-dim { color: var(--tip-dim); }
.tip .tt-loss span:last-child { color: #ff8f8f; }

/* ------------------------------------------------------------------ responsive */

@media (max-width: 980px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); min-height: 0; padding-top: 4.2rem; }
  .st-body { grid-template-columns: minmax(0, 1fr); }
  .gallery-body { grid-template-columns: minmax(0, 1fr); }
  .gallery-side { border-left: 0; border-top: 1px solid var(--hair); }
}
@media (max-width: 720px) {
  body { font-size: 1.125rem; }
  .gallery-stage { min-height: 320px; aspect-ratio: 1 / 1; }
  .hv-target { width: 104px; }
  .btn { padding: 0.6rem 0.85rem; font-size: 0.9rem; }
}
@media (max-width: 760px) {
  .st-tabs { flex-wrap: nowrap; }
  .st-tab { padding: 0.5rem 0.65rem; font-size: 0.84rem; }
  .st-tab:not([aria-selected="true"]) .st-tl { display: none; }
  .st-math li.past, .st-math li.later { display: none; }
  .st-math { padding-top: 0; }
}
@media (max-width: 600px) {
  .bib-dlg pre { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 0.74rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body { transition: none; }
  .js .hero-copy > *, .js .hero-visual { animation: none; }
}
@media print { .actions, .chip { display: none; } }