/* VQ-WM project page
   Layout: one centered column (72ch prose, 1120px figures), alternating bands,
   figures sit on a light "plate" in both themes because they come from the paper. */
:root {
  --bg: #f6f7fa;
  --surface: #ffffff;
  --band: #eef1f6;
  --fg: #151b26;
  --muted: #5b6676;
  --line: #d9dfe8;
  --plate: #ffffff;
  --raster-bg: transparent;
  --raster-pad: 0px;
  --accent: #2457b5;      /* controller / feedback blue from the figures */
  --accent-ink: #ffffff;
  --accent-2: #d97a12;    /* planning orange from the figures */
  --accent-soft: #e4ecfa;
  --ok: #1b8a5a;
  --font-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", sans-serif;
  --font-body: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f141b; --surface: #161d27; --band: #131a23; --fg: #e9edf3; --muted: #9ba7b8;
    --line: #28323f; --plate: #f3f5f8; --raster-bg: #eef1f5; --raster-pad: 14px; --accent: #7aa6ff; --accent-ink: #0b1220;
    --accent-2: #f0a24a; --accent-soft: #1b2a45; --ok: #4cc48c; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f141b; --surface: #161d27; --band: #131a23; --fg: #e9edf3; --muted: #9ba7b8;
  --line: #28323f; --plate: #f3f5f8; --raster-bg: #eef1f5; --raster-pad: 14px; --accent: #7aa6ff; --accent-ink: #0b1220;
  --accent-2: #f0a24a; --accent-soft: #1b2a45; --ok: #4cc48c; color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: var(--font-body); font-size: 17px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--surface); }
img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:focus-visible, .btn:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; }

.wrap {
  max-width: 1120px; margin-inline: auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

/* top bar */
.topbar { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 9; background: color-mix(in srgb, var(--surface) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 10px; }
.brand { white-space: nowrap; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; letter-spacing: 0.01em; color: var(--fg); text-decoration: none; }
.topbar nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 0.92rem; }
.topbar nav a { color: var(--muted); text-decoration: none; }
.topbar nav a:hover { color: var(--fg); }

/* hero */
.hero-text { text-align: center; display: flex; flex-direction: column; align-items: center; }
.hero { padding-block: 56px 40px; background: var(--surface); border-bottom: 1px solid var(--line); }
.badge { display: inline-block; font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); background: var(--accent-soft); border-radius: 999px; padding: 4px 12px; margin: 0 0 18px; }
.hero h1 { font-family: var(--font-display); font-weight: 800; font-size: clamp(2.6rem, 7vw, 4.6rem); line-height: 1; letter-spacing: -0.02em; margin: 0 0 10px; text-wrap: balance; }
.subtitle { font-family: var(--font-display); font-weight: 500; font-size: clamp(1.2rem, 2.6vw, 1.7rem); line-height: 1.25; margin: 0 0 20px; max-width: 60ch; text-wrap: balance; }
.t-vq { color: var(--accent); }
.t-wm { color: var(--accent-2); }
/* art title: gradient letters, tight tracking, and a row of discrete "codebook" steps underneath */
:root { --vq-a: #1d4ed8; --vq-b: #3b82f6; --wm-a: #c2410c; --wm-b: #f59e0b; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --vq-a: #93b4ff; --vq-b: #4f86ee; --wm-a: #fbbf24; --wm-b: #ea8a2a; } }
:root[data-theme="dark"] { --vq-a: #93b4ff; --vq-b: #4f86ee; --wm-a: #fbbf24; --wm-b: #ea8a2a; }
h1.art { display: inline-block; margin-bottom: 14px; letter-spacing: -0.045em; font-size: clamp(3rem, 9vw, 5.6rem); font-weight: 800; font-variation-settings: "opsz" 96; line-height: 0.95; }
h1.art .t-vq, h1.art .t-wm { background-clip: text; -webkit-background-clip: text; color: transparent; -webkit-text-fill-color: transparent; }
h1.art .t-vq { background-image: linear-gradient(135deg, var(--vq-a), var(--vq-b)); }
h1.art .t-wm { background-image: linear-gradient(135deg, var(--wm-a), var(--wm-b)); }
h1.art .t-dash { display: inline-block; transform: translateY(-0.06em) scaleX(0.7); margin: 0 -0.03em; opacity: 0.55; }
@supports not (background-clip: text) { h1.art .t-vq { color: var(--accent); } h1.art .t-wm { color: var(--accent-2); } }
.t-dash { color: var(--muted); font-weight: 500; }
.hl { color: var(--accent); }
.authors { margin: 0 0 6px; font-size: 1.05rem; }
.authors a { color: var(--fg); text-decoration: none; border-bottom: 1px solid var(--line); }
.authors sup { font-size: 0.7em; color: var(--muted); }
.affils { margin: 0 0 6px; color: var(--muted); font-size: 0.95rem; }
.affils-note { margin-bottom: 22px; font-size: 0.88rem; }
.abstract { max-width: 76ch; margin: 0 0 32px; text-align: left; }
.abstract .eyebrow { text-align: center; margin-bottom: 10px; }
.abstract p:not(.eyebrow) { margin: 0; font-size: 1.02rem; line-height: 1.65; }
.btn-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 32px; }
.btn-arxiv { border-color: var(--accent); color: var(--accent); cursor: default; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: 8px; font-weight: 600; font-size: 0.95rem; text-decoration: none; border: 1px solid var(--line); color: var(--fg); background: var(--surface); }
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-disabled { color: var(--muted); cursor: default; border-style: dashed; }

.video-frame { width: 100%; max-width: 960px; margin: 0 auto 40px; }
.video-frame video { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; max-width: 100%; border-radius: 12px; background: #000; }

.hero-fig { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 28px; align-items: center; }
.hero-fig .plate { background: var(--raster-bg); border-radius: 12px; padding: var(--raster-pad); }
.hero-fig figcaption { font-size: 0.98rem; color: var(--muted); }
.hero-fig figcaption strong { color: var(--fg); }
.legend { list-style: none; padding: 0; margin: 14px 0 0; display: grid; gap: 8px; font-size: 0.93rem; }
.legend li { display: flex; gap: 10px; align-items: baseline; }
.legend i { flex: none; width: 12px; height: 12px; border-radius: 50%; transform: translateY(1px); }
@media (max-width: 820px) { .hero-fig { grid-template-columns: 1fr; } }

/* headline results band */
.results-band { background: var(--band); border-bottom: 1px solid var(--line); padding-block: 36px 40px; }
.results-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.result { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px 20px; min-width: 0; }
.result h3 { margin: 0 0 6px; font-size: 1.02rem; font-weight: 600; color: var(--muted); }
.result-big { margin: 0 0 14px; font-family: var(--font-display); font-weight: 700; font-size: 2.6rem; line-height: 1; letter-spacing: -0.02em; color: var(--accent); }
.result-big small { font-size: 0.5em; font-weight: 600; color: var(--muted); }
.result-metric { display: block; margin-top: 6px; font-family: var(--font-body); font-weight: 400; font-size: 0.85rem; letter-spacing: 0; color: var(--muted); }
.mini-chart { width: 100%; height: auto; display: block; margin-top: 4px; }
.mc-grid { stroke: var(--chart-grid); stroke-width: 1; }
.mc-base { stroke: var(--line); }
.mc-tick { fill: var(--muted); font-size: 10px; font-variant-numeric: tabular-nums; }
.mc-cat { fill: var(--muted); font-size: 11px; }
.mc-cat.ours { fill: var(--fg); font-weight: 600; }
.mc-bar { fill: var(--chart-base); }
.mc-bar.ours { fill: var(--chart-ours); }
.mc-val { fill: var(--fg); font-size: 12px; font-weight: 600; font-variant-numeric: tabular-nums; transition: opacity 0.2s; }
@media (max-width: 900px) { .results-grid { grid-template-columns: 1fr; } }

/* sections */
.section { padding-block: 52px; }
.section-alt { background: var(--surface); border-block: 1px solid var(--line); }
.eyebrow { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent-2); margin: 0 0 10px; }
h2 { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.5rem, 3vw, 2.1rem); line-height: 1.15; letter-spacing: -0.015em; margin: 0 0 20px; max-width: 34ch; text-wrap: balance; }
h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.25rem; margin: 30px 0 10px; }
.prose { max-width: 72ch; }
.prose p { margin: 0 0 16px; }
.prose ul { padding-left: 1.2em; margin: 0 0 16px; }
.prose li { margin-bottom: 10px; }
.prose li::marker { color: var(--accent-2); }
.q { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent); margin-right: 6px; }
.math { font-family: "Times New Roman", Times, serif; font-style: italic; }

figure { margin: 28px 0 0; }
figure .plate { background: var(--raster-bg); border-radius: 12px; padding: var(--raster-pad); overflow-x: auto; }
figure .plate-photo, figure .plate-chart { background: transparent; padding: 0; }
figure .plate-photo img { border-radius: 10px; }
figure .plate img { margin-inline: auto; }
figure .plate-wide img { min-width: 760px; }
figcaption { margin-top: 12px; font-size: 0.95rem; color: var(--muted); max-width: 90ch; }
figcaption strong { color: var(--fg); }
.fig-narrow { max-width: 620px; }

/* two-column method cards */
.cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-top: 28px; }
.card { border: 1px solid var(--line); border-radius: 12px; padding: 22px 24px; background: var(--surface); min-width: 0; }
.section-alt .card { background: var(--bg); }
.card h3 { margin-top: 0; }
.card p, .card ol { margin: 0 0 10px; font-size: 0.98rem; }
.card ol { padding-left: 1.2em; }
.card li { margin-bottom: 6px; }
.rate { display: inline-block; font-family: var(--font-mono); font-size: 0.75rem; letter-spacing: 0.06em; text-transform: uppercase; padding: 2px 8px; border-radius: 4px; margin-left: 8px; vertical-align: middle; }
.rate-slow { color: #7c3aed; background: color-mix(in srgb, #7c3aed 14%, var(--surface)); }
.rate-fast { color: var(--accent); background: var(--accent-soft); }
@media (max-width: 760px) { .cols { grid-template-columns: 1fr; } }

/* training steps */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 20px 0 0; max-width: 80ch; display: grid; gap: 14px; }
.steps li { counter-increment: step; display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 14px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg); }
.steps li::before { content: counter(step); font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); }
.steps h4 { grid-column: 2; margin: 4px 0 6px; font-family: var(--font-display); font-weight: 600; font-size: 1.08rem; }
.steps p { grid-column: 2; margin: 0; font-size: 0.97rem; }
@media (max-width: 520px) { .steps li { grid-template-columns: 1fr; } .steps li::before { grid-row: 1; } .steps h4, .steps p { grid-column: 1; } }

.steps-row { grid-template-columns: repeat(4, minmax(0, 1fr)); max-width: none; }
.steps-row li { grid-template-columns: 1fr; gap: 8px; padding: 16px; }
.steps-row li::before { grid-row: 1; }
.steps-row h4, .steps-row p { grid-column: 1; }
.steps-row h4 { margin: 0; font-size: 1rem; }
.steps-row p { font-size: 0.92rem; color: var(--muted); }
@media (max-width: 900px) { .steps-row { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 520px) { .steps-row { grid-template-columns: 1fr; } }
.lead { font-size: 1.05rem; margin: 0 0 8px; max-width: 60ch; }

/* definition block */
.defn { border-left: 3px solid var(--accent-2); padding: 6px 0 6px 18px; margin: 22px 0; max-width: 72ch; }
.defn p { margin: 0; }
.defn .term { font-family: var(--font-display); font-weight: 600; }

/* results tables */
.tablewrap { overflow-x: auto; margin-top: 20px; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; font-variant-numeric: tabular-nums; }
caption { text-align: left; font-size: 0.92rem; color: var(--muted); padding-bottom: 8px; caption-side: top; }
th, td { text-align: right; padding: 9px 12px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
thead th { font-weight: 600; color: var(--muted); font-size: 0.85rem; letter-spacing: 0.03em; text-transform: uppercase; border-bottom: 2px solid var(--line); }
tr.ours td { font-weight: 700; background: var(--accent-soft); }
tr.ours td:first-child { color: var(--accent); }
td .pm { color: var(--muted); font-weight: 400; font-size: 0.85em; }
.table-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 28px; align-items: start; }
@media (max-width: 820px) { .table-grid { grid-template-columns: 1fr; } }

:root { --chart-ours: #2457b5; --chart-base: #74839a; --chart-grid: #e3e8ef; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { --chart-ours: #5b8ef0; --chart-base: #7a8aa0; --chart-grid: #26303d; } }
:root[data-theme="dark"] { --chart-ours: #5b8ef0; --chart-base: #7a8aa0; --chart-grid: #26303d; }

/* ablation chart (drawn, not an image) */
.abl-chart { width: 100%; height: auto; display: block; }
.ab-grid { stroke: var(--chart-grid); stroke-width: 1; }
.ab-base { stroke: var(--line); }
.ab-tick { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.ab-axis { fill: var(--muted); font-size: 12px; }
.ab-line { fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.ab-line.ab-fpt { stroke: var(--chart-ours); }
.ab-line.ab-euc { stroke: var(--chart-base); }
.ab-pt line { stroke: var(--fg); stroke-opacity: 0.55; stroke-width: 1.2; }
.ab-pt circle, .ab-pt rect, .ab-legend circle, .ab-legend rect { stroke: var(--surface); stroke-width: 2; }
.ab-pt.ab-fpt circle, .ab-legend .ab-fpt { fill: var(--chart-ours); }
.ab-pt.ab-euc rect, .ab-legend .ab-euc { fill: var(--chart-base); }
.ab-legend text { fill: var(--fg); font-size: 12px; }

.tablewrap-center { display: flex; justify-content: center; }
.table-auto { width: auto; min-width: min(100%, 24rem); }

/* side by side figure + prose */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 32px; align-items: start; margin-top: 8px; }
.split figure { margin: 0; }
.split-top { align-items: start; }
.split-top h2 { max-width: none; }
.split-top .abl-chart { margin-top: -6px; }
@media (max-width: 820px) { .split { grid-template-columns: 1fr; } }

/* bibtex */
.bibtex-note { color: var(--muted); margin: 0; max-width: 72ch; }
.bibtex { font-family: var(--font-mono); font-size: 0.85rem; line-height: 1.55; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 18px 20px; overflow-x: auto; margin: 0; max-width: 72ch; }
.copy-row { display: flex; gap: 12px; align-items: center; margin-top: 12px; }
.copy-btn { font: inherit; font-size: 0.9rem; font-weight: 600; padding: 8px 14px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--fg); cursor: pointer; }
.copy-btn:hover { border-color: var(--accent); }
.copy-status { font-size: 0.9rem; color: var(--ok); }

footer { border-top: 1px solid var(--line); padding-block: 32px; color: var(--muted); font-size: 0.92rem; }
footer p { margin: 0 0 6px; max-width: 80ch; }