/* ------------------------------------------------------------------
   Same Scene, Different Task — project page
   ------------------------------------------------------------------ */

:root {
  color-scheme: light;

  --bg: #ffffff;
  --bg-alt: #f6f7f4;
  --surface: #ffffff;

  --ink: #16181b;
  --ink-2: #474c53;
  --ink-3: #767c85;
  --line: #e3e5e0;
  --line-strong: #cdd1ca;

  --accent: #2a7a3b;        /* CRAFT green, text-safe on white */
  --accent-ink: #1e5c2b;
  --accent-soft: #eaf5e7;
  --ft: #6b717a;            /* standard fine-tuning gray */
  --marker: #ffe27a;        /* instruction highlighter, as in the paper figures */

  --ent-red: #d8453a;
  --ent-blue: #2f68d0;
  --ent-green: #2f9a52;
  --ent-yellow: #e8b418;

  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1040px;
  --maxw-narrow: 760px;
  --gutter: 24px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --video-ratio: 4 / 3;     /* explorer rollout videos (640x480) */
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 64px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, video { display: block; max-width: 100%; height: auto; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-ink); }
sub { font-size: 0.72em; line-height: 0; }
h1, h2, h3 { color: var(--ink); line-height: 1.2; }
h2 { font-size: clamp(1.5rem, 1.1rem + 1.4vw, 2rem); font-weight: 750; letter-spacing: -0.015em; margin: 0 0 0.6em; }
h3 { font-size: 1.2rem; font-weight: 700; letter-spacing: -0.005em; margin: 0 0 0.4em; }
p { margin: 0 0 1em; }

.container { max-width: calc(var(--maxw) + 2 * var(--gutter)); margin: 0 auto; padding: 0 var(--gutter); }

.section { padding: 88px 0; }
.section.alt { background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
/* one content column: prose is justified (no hyphenation) so its edges line up with figures and tables */
.nw { white-space: nowrap; }
@media (min-width: 641px) {
  #abstract p, .lede, .block-text, .split-text p { text-align: justify; text-wrap: pretty; }
  .ls { letter-spacing: var(--ls, 0); } /* per-paragraph tracking (set inline as --ls) that evens out the justified lines */
}
.eyebrow { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.09em; text-transform: uppercase; color: var(--accent); margin: 0 0 0.7em; }
.lede { font-size: 1.08rem; color: var(--ink-2); }
.math { font-family: "STIX Two Math", "Cambria Math", "Latin Modern Math", "Times New Roman", serif; font-style: normal; font-synthesis: none; white-space: nowrap; }
.math sub { font-family: var(--font); font-size: 0.68em; }

/* ---------- top nav ---------- */
.topnav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.topnav-inner { max-width: calc(var(--maxw) + 2 * var(--gutter)); margin: 0 auto; padding: 0 var(--gutter); height: 52px; display: flex; align-items: center; gap: 24px; }
.brand { position: relative; display: inline-flex; align-items: center; padding-left: 13px; line-height: 1; font-weight: 800; letter-spacing: 0.02em; color: var(--ink); text-decoration: none; flex: none; }
.brand:hover { color: var(--ink); }

/* hammer striking the wordmark: pivots at the grip, which sits beside the C at its mid-height */
.brand-word { display: inline-block; transform-origin: 50% 100%; }
.brand-hammer { position: absolute; left: 1.7px; top: 2.2px; width: 26px; height: 13px; overflow: visible; transform-origin: 6.9% 48.75%; transform: rotate(-57deg); }
.brand-spark { position: absolute; left: 14px; top: -3.5px; width: 12px; height: 6px; opacity: 0; }
@media (prefers-reduced-motion: no-preference) {
  .brand-hammer { animation: hammer-strike 1.6s infinite; }
  .brand-word { animation: word-struck 1.6s infinite; }
  .brand-spark { animation: spark 1.6s infinite; }
}
@keyframes hammer-strike {
  0% { transform: rotate(-40deg); animation-timing-function: cubic-bezier(0.2, 0.7, 0.3, 1); }
  42% { transform: rotate(-66deg); animation-timing-function: cubic-bezier(0.6, 0, 1, 0.6); }
  52% { transform: rotate(-38deg); animation-timing-function: ease-out; }
  58% { transform: rotate(-46deg); animation-timing-function: ease-in; }
  64%, 100% { transform: rotate(-40deg); }
}
@keyframes word-struck {
  0%, 51% { transform: none; }
  53% { transform: translateY(1.5px) scale(1.04, 0.86); }
  60%, 100% { transform: none; }
}
@keyframes spark {
  0%, 51% { opacity: 0; transform: scale(0.6); }
  53% { opacity: 1; transform: scale(1); }
  62%, 100% { opacity: 0; transform: scale(1.25); }
}
.topnav-links { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; margin-left: auto; }
.topnav-links::-webkit-scrollbar { display: none; }
.topnav-links.is-overflowing { -webkit-mask-image: linear-gradient(90deg, #000 82%, transparent); mask-image: linear-gradient(90deg, #000 82%, transparent); padding-right: 28px; }
.topnav-links a { flex: none; font-size: 0.9rem; color: var(--ink-2); text-decoration: none; padding: 6px 10px; border-radius: 8px; }
.topnav-links a:hover { background: var(--bg-alt); color: var(--ink); }
.topnav-links a.is-active { color: var(--ink); background: var(--bg-alt); font-weight: 600; }

/* ---------- hero ---------- */
.hero { padding: 72px 0 24px; }
.hero-inner { text-align: center; }
.venue { display: inline-block; font-size: 0.82rem; font-weight: 600; color: var(--ink-2); border: 1px solid var(--line-strong); border-radius: 999px; padding: 3px 12px; margin-bottom: 26px; }
.title { margin: 0 0 26px; }
.title-main { display: block; text-wrap: balance; font-size: clamp(2.3rem, 1.3rem + 4.4vw, 4rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.05; }
.title-sub { display: block; text-wrap: balance; margin-top: 14px; font-size: clamp(1.15rem, 0.95rem + 1vw, 1.6rem); font-weight: 500; color: var(--ink-2); letter-spacing: -0.01em; line-height: 1.3; }
.marker { color: inherit; background: linear-gradient(transparent 58%, var(--marker) 58%, var(--marker) 92%, transparent 92%); padding: 0 0.06em; }

.authors { font-size: 1.12rem; margin: 0 0 4px; }
.authors a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--line-strong); }
.authors a:hover { border-bottom-color: var(--ink); }
.authors .sep { margin-right: 0.45em; color: var(--ink-3); }
.affil { color: var(--ink-2); margin: 0 0 28px; }

.links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 48px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  height: 42px; padding: 0 18px; border-radius: 999px;
  background: var(--ink); color: #fff; text-decoration: none;
  font-weight: 600; font-size: 0.95rem; border: 1px solid var(--ink);
  transition: transform 0.15s ease, background 0.15s ease;
}
.btn:hover { color: #fff; background: #2b2f34; transform: translateY(-1px); }
.btn svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.btn svg.fill { fill: currentColor; stroke: none; }
.btn.is-soon { background: var(--surface); color: var(--ink-3); border-color: var(--line-strong); cursor: default; }
.btn.is-soon:hover { transform: none; color: var(--ink-3); }
.soon { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; background: var(--bg-alt); border-radius: 999px; padding: 1px 7px; }


/* ---------- figures ---------- */
.fig { margin: 32px 0; }
.fig img { width: 100%; border-radius: var(--radius-sm); background: #fff; }
.fig figcaption { margin: 12px auto 0; font-size: 0.93rem; color: var(--ink-2); line-height: 1.55; text-align: center; }
/* captions are written as short logical lines; each wraps evenly on narrow screens */
.cl { display: block; text-wrap: balance; }
.teaser { margin-top: 0; }
.fig-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; max-width: 1000px; margin: 32px auto 0; align-items: start; }
.fig-pair .fig { margin: 0; }
.section.alt .fig img { box-shadow: 0 0 0 1px var(--line); }


/* ---------- layout helpers ---------- */
.split { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: 40px; align-items: center; }
.split.reverse > .split-text { order: 2; }
.split .fig { margin: 0; }
/* text-column share tuned per row so justified lines have even word spacing (see --tw in index.html) */
.split.tuned { grid-template-columns: minmax(0, var(--tw)) minmax(0, 1fr); }
.split.tuned.reverse { grid-template-columns: minmax(0, 1fr) minmax(0, var(--tw)); }
.split + .split { margin-top: 40px; }

/* object-target combination matrix (paper Table A.1) */
.matrix-wrap { overflow-x: auto; }
.combo-matrix { width: 100%; border-collapse: separate; border-spacing: 4px; font-size: 0.9rem; }
.combo-matrix th { font-weight: 500; color: var(--ink-2); font-size: 0.82rem; line-height: 1.25; }
.combo-matrix thead th { padding: 0 2px 4px; text-align: center; }
.combo-matrix tbody th { text-align: right; padding-right: 8px; white-space: nowrap; }
.combo-matrix td { height: 50px; min-width: 56px; text-align: center; border-radius: 8px; line-height: 1.15; font-size: 1.05rem; }
.combo-matrix td.demo, .combo-matrix td.undemo { background: var(--bg-alt); box-shadow: inset 0 0 0 1px var(--line); }
.combo-matrix td.undemo { color: var(--ink-3); }
.combo-matrix .idx { font-size: 0.72rem; color: var(--ink-3); margin-left: 3px; font-variant-numeric: tabular-nums; }
.combo-matrix .cell-tag { display: block; font-size: 0.68rem; font-weight: 700; letter-spacing: 0.03em; margin-top: 2px; }
.combo-matrix td.is-instructed { background: #fff3c4; box-shadow: inset 0 0 0 1.5px #d9ae1f; color: #7a5c00; }
.combo-matrix td.is-executed { background: #fdeceb; box-shadow: inset 0 0 0 1.5px #df7b72; color: #b42318; }
.combo-matrix td.is-executed .idx { color: #b42318; }
.hl-instructed { background: #fff3c4; box-shadow: inset 0 0 0 1.5px #d9ae1f; color: #7a5c00; border-radius: 6px; padding: 0 5px; font-weight: 600; white-space: nowrap; } /* same as the table's instructed cell */
.matrix-legend { font-size: 0.8rem; color: var(--ink-3); margin: 8px 0 0; text-align: center; }

/* action predictions under a fixed observation (paper Fig. D.3) */
.pred { display: grid; gap: 22px; }
.pred-head { text-align: center; margin: 0 0 8px; font-size: 0.84rem; color: var(--ink-2); line-height: 1.7; }
.pred-tag { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; color: var(--accent); margin-right: 8px; }
.pred-instr { display: block; font-size: 0.95rem; color: var(--ink); }
.pred-head .ent-s { display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; font-weight: 600; color: var(--ink); }
.pred-head .sep { color: var(--ink-3); margin: 0 5px; }
.pred-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.pred-panel { margin: 0; }
.pred-panel .vlabel { justify-content: center; margin-bottom: 2px; font-size: 0.76rem; }
.pred-img { position: relative; }
.pred-img img { width: 100%; height: auto; }
.zoom-box { position: absolute; border: 1px dashed rgba(22, 24, 27, 0.75); border-radius: 2px; pointer-events: none; }
.zoom-inset { position: absolute; top: 1%; width: 38%; aspect-ratio: 4 / 3; border-radius: 5px; background-color: #fff; background-repeat: no-repeat; box-shadow: 0 0 0 1px rgba(22, 24, 27, 0.7), 0 4px 10px rgba(0, 0, 0, 0.12); }
.zoom-inset.left { left: 1%; }
.zoom-inset.right { right: 1%; }
.pred-legend { text-align: center; font-size: 0.78rem; color: var(--ink-3); margin: 0; }

/* instructed vs executed notes under a rollout figure */
.fig figcaption.io { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 6px 12px; text-align: left; font-size: 0.92rem; color: var(--ink); margin-top: 12px; }
.io-k { font-size: 0.7rem; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; color: var(--ink-3); padding-top: 4px; }
.io-v { line-height: 1.55; }
.io-empty { color: var(--ink-3); }
.pill { display: inline-block; font-size: 0.74rem; font-weight: 650; border-radius: 999px; padding: 1px 8px; margin-left: 2px; white-space: nowrap; vertical-align: 1px; }
.pill-instructed { background: #fff3c4; color: #7a5c00; box-shadow: inset 0 0 0 1px #e8c95a; }
.pill-executed { background: #fdeceb; color: #b42318; box-shadow: inset 0 0 0 1px #f1b3ad; }
.fig-note { font-size: 0.85rem; color: var(--ink-3); text-align: center; margin: 18px 0 0; }
.block { margin: 56px 0; }
.block:first-of-type { margin-top: 24px; }
.block-text { color: var(--ink-2); }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 8px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.card.pad { padding: 22px 22px 8px; }
.card h3 { font-size: 1.08rem; }
.card p { color: var(--ink-2); font-size: 0.96rem; }
.card-kicker { font-size: 0.8rem; font-weight: 700; color: var(--accent); letter-spacing: 0.04em; margin-bottom: 8px; }
.card-kicker .math { font-size: 1.05rem; color: var(--accent-ink); }

.objective { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: center; gap: 6px 16px; margin: 28px 0; padding: 16px; border-radius: var(--radius); background: var(--surface); border: 1px dashed var(--line-strong); }
.objective .math { font-size: 1.3rem; }
.objective-note { font-size: 0.9rem; color: var(--ink-3); }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 24px 0 12px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
table.data { width: 100%; border-collapse: collapse; font-size: 0.95rem; font-variant-numeric: tabular-nums; }
.table-cap { font-size: 0.88rem; color: var(--ink-3); margin: 24px 0 8px; }
.table-cap + .table-wrap { margin-top: 0; }
table.data th, table.data td { padding: 9px 12px; text-align: center; white-space: nowrap; border-bottom: 1px solid var(--line); }
table.data thead th { font-weight: 650; color: var(--ink-2); font-size: 0.88rem; background: var(--bg-alt); }
table.data tbody tr:last-child td { border-bottom: 0; }
table.data .left { text-align: left; }
table.data .th-sub { font-weight: 500; color: var(--ink-3); font-size: 0.8rem; }
table.data .sd { font-size: 0.75em; color: var(--ink-3); margin-left: 1px; }
table.data .emph { background: rgba(42, 122, 59, 0.035); }
table.data thead .emph { background: #eef3ec; color: var(--ink); }
table.data tr.group th { text-align: left; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; color: var(--ink-3); background: var(--surface); padding-top: 16px; }
table.data tr.ours td { background: var(--accent-soft); font-weight: 700; color: var(--accent-ink); }
table.data tr.ours .sd { color: var(--accent); font-weight: 500; }
table.compact { font-size: 0.93rem; }
.split-aside .table-wrap { margin: 0; }
.split-aside .table-cap { margin-top: 0; }

.notes { margin: 16px 0 0; padding-left: 1.1em; color: var(--ink-2); font-size: 0.9rem; }
.notes li { margin-bottom: 4px; }

/* ---------- entity swatches ---------- */
.sw { display: inline-block; flex: none; width: 12px; height: 12px; vertical-align: -1px; }
.sw.cube { border-radius: 3px; }
.sw.plate { width: 15px; height: 10px; border-radius: 50%; vertical-align: 0; }
.sw.button { border-radius: 50%; box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.55); }
.sw.red { background: var(--ent-red); }
.sw.blue { background: var(--ent-blue); }
.sw.green { background: var(--ent-green); }
.sw.yellow { background: var(--ent-yellow); }

/* ---------- explorer ---------- */
.explorer { margin-top: 28px; padding: 20px; box-shadow: 0 1px 2px rgba(20, 24, 20, 0.04), 0 8px 28px rgba(20, 24, 20, 0.05); }
.explorer-controls { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 20px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.seg { display: inline-flex; background: var(--bg-alt); border: 1px solid var(--line); border-radius: 10px; padding: 3px; gap: 2px; }
.seg button { font: inherit; font-size: 0.9rem; font-weight: 600; color: var(--ink-2); background: transparent; border: 0; border-radius: 7px; padding: 6px 12px; cursor: pointer; }
.seg button:hover { color: var(--ink); }
.seg button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08), 0 0 0 1px var(--line); }
.seg button:focus-visible, .cell:focus-visible, .copy:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.seg-wrap { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.seg-label { font-size: 0.85rem; color: var(--ink-3); }

.explorer-body { display: grid; grid-template-columns: minmax(300px, 380px) 1fr; gap: 32px; padding-top: 22px; align-items: start; }

.matrix { display: flex; flex-wrap: wrap; gap: 22px 28px; }
.mx { --cell: 62px; --rowhead: 64px; display: grid; grid-template-columns: auto var(--rowhead) repeat(var(--n), var(--cell)); gap: 2px; align-items: center; }
.mx-title { justify-self: center; white-space: nowrap; font-size: 0.85rem; font-weight: 650; color: var(--ink-2); margin-bottom: 6px; display: flex; align-items: center; gap: 7px; }
.mx-axis-x { justify-self: center; white-space: nowrap; font-size: 0.78rem; color: var(--ink-3); margin-bottom: 2px; }
.mx-axis-y { justify-self: center; align-self: center; writing-mode: vertical-rl; transform: rotate(180deg); font-size: 0.78rem; color: var(--ink-3); margin-right: 4px; }
.mx-colhead, .mx-rowhead { font-size: 0.78rem; color: var(--ink-2); display: flex; align-items: center; gap: 5px; }
.mx-colhead { flex-direction: column; justify-content: flex-end; gap: 3px; padding-bottom: 5px; line-height: 1.1; }
.mx-rowhead { justify-content: flex-end; padding-right: 6px; height: var(--cell); }

.cell {
  width: var(--cell); height: var(--cell);
  border: 0; border-radius: 6px; padding: 0; cursor: pointer;
  font: inherit; font-size: 0.9rem; font-weight: 650; font-variant-numeric: tabular-nums;
  display: grid; place-items: center; position: relative;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.cell:hover { transform: translateY(-1px); box-shadow: 0 0 0 2px var(--ink-3); }
.cell[aria-pressed="true"] { box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--ink); z-index: 1; }
.cell.is-demo {
  color: var(--ink-3); font-weight: 600; font-size: 0.78rem;
  background: repeating-linear-gradient(45deg, #ececea 0 3px, #f8f8f6 3px 7px);
}

.scale { margin-top: 18px; max-width: 320px; }
.scale-row { display: flex; justify-content: space-between; align-items: center; font-size: 0.78rem; color: var(--ink-3); margin-bottom: 6px; }
.scale-demo { display: inline-flex; align-items: center; gap: 6px; }
.demo-swatch { width: 14px; height: 14px; border-radius: 3px; background: repeating-linear-gradient(45deg, #dcdcd9 0 2px, #f3f3f1 2px 4px); display: inline-block; }
.scale-bar { height: 8px; border-radius: 4px; background: var(--scale-gradient, linear-gradient(90deg, #f1f8ee, #1d6a34)); }
.scale-ticks { display: flex; justify-content: space-between; font-size: 0.72rem; color: var(--ink-3); margin-top: 3px; font-variant-numeric: tabular-nums; }

.combo-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-bottom: 10px; }
.combo-tag { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; border-radius: 999px; padding: 3px 10px; background: var(--accent-soft); color: var(--accent-ink); }
.combo-tag.is-demo { background: var(--bg-alt); color: var(--ink-2); border: 1px solid var(--line); }
.combo-stats { font-size: 0.86rem; color: var(--ink-3); }
.combo-stats b { color: var(--ink); font-weight: 650; }

.instr { font-size: 1.2rem; line-height: 1.5; margin: 0 0 18px; color: var(--ink); }
.instr .q { color: var(--ink-3); }
.ent { display: inline-flex; align-items: center; gap: 6px; padding: 0 3px; margin: 0 1px; border-radius: 5px; background: linear-gradient(transparent 55%, var(--marker) 55%, var(--marker) 95%, transparent 95%); background-repeat: no-repeat; background-size: 100% 100%; font-weight: 600; white-space: nowrap; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.vslot { min-width: 0; }
.vlabel { font-size: 0.82rem; font-weight: 700; margin-bottom: 6px; display: flex; align-items: center; gap: 7px; }
.vlabel::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
.vlabel.is-ft { color: var(--ft); }
.vlabel.is-craft { color: var(--accent); }
.vbox { position: relative; aspect-ratio: var(--video-ratio); border-radius: var(--radius-sm); overflow: hidden; background: #eef0ec; }
.vbox video { width: 100%; height: 100%; object-fit: cover; }
.ph {
  position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  padding: 16px; text-align: center; border: 1.5px dashed var(--line-strong); border-radius: var(--radius-sm);
  background: repeating-linear-gradient(135deg, #f4f5f2 0 10px, #eff1ed 10px 20px);
}
.ph::before { content: ""; width: 34px; height: 34px; border-radius: 50%; background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M9 7l8 5-8 5z' fill='%23767c85'/%3E%3C/svg%3E") center/18px no-repeat; box-shadow: 0 0 0 1px var(--line); }
.ph-title { font-size: 0.85rem; font-weight: 600; color: var(--ink-2); }
.ph-path { display: none; font-family: var(--mono); font-size: 0.7rem; color: var(--ink-3); word-break: break-all; background: rgba(255, 255, 255, 0.7); padding: 2px 6px; border-radius: 4px; }
.ph { display: none; }
.vslot.missing .ph { display: flex; }
.vslot.solo { max-width: 720px; margin: -8px auto 0; }
.vslot.solo .vbox { aspect-ratio: 16 / 9; }
.vslot.alpha .vbox { aspect-ratio: 4 / 3; background: transparent; border-radius: 0; }
.vslot.alpha .vbox video { object-fit: contain; }
.explorer .vbox { background: transparent; border-radius: 0; }
.explorer .vbox video { object-fit: contain; }
.compare-note { margin: 8px 0 0; font-size: 0.8rem; color: var(--ink-3); text-align: center; }
.live-instr { display: flex; flex-wrap: wrap; justify-content: center; align-items: baseline; gap: 4px 12px; margin: 10px auto 0; min-height: 2.3em; font-size: 1.12rem; text-align: center; }
.live-label { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.ent.no-mark { background-image: none; }
.ent.is-changed { animation: ent-pop 0.45s ease-out; }
.ent.mark-in { animation: mark-in 0.35s ease-out; }
@keyframes ent-pop { 0% { transform: scale(1); } 35% { transform: scale(1.14); } 100% { transform: scale(1); } }
@keyframes mark-in { from { background-size: 0% 100%; } to { background-size: 100% 100%; } }
@media (prefers-reduced-motion: reduce) { .ent.is-changed, .ent.mark-in { animation: none; } }

.video-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; margin-top: 8px; }
.combo-label { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 4px 5px; font-size: 0.78rem; font-weight: 600; color: var(--ink-2); margin-bottom: 6px; line-height: 1.3; }
.combo-label .sw { width: 10px; height: 10px; }
.combo-label .sw.plate { width: 13px; height: 9px; }
.combo-label .arrow { color: var(--ink-3); font-weight: 500; margin: 0 1px; }
.combo-label .ent-s { display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; }
.video-grid .vbox { aspect-ratio: 4 / 3; }

/* ---------- bibtex ---------- */
.bibtex { position: relative; }
.bibtex pre { margin: 0; overflow-x: auto; background: #f4f5f2; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px 22px; font-family: var(--mono); font-size: 0.86rem; line-height: 1.6; color: var(--ink); }
.copy { position: absolute; top: 10px; right: 10px; font: inherit; font-size: 0.8rem; font-weight: 600; color: var(--ink-2); background: var(--surface); border: 1px solid var(--line-strong); border-radius: 8px; padding: 4px 10px; cursor: pointer; }
.copy:hover { color: var(--ink); border-color: var(--ink-3); }

.footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--ink-3); font-size: 0.88rem; text-align: center; }
.footer p { margin: 0; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .explorer-body { grid-template-columns: 1fr; }
  .scale { max-width: none; }
  .cards { grid-template-columns: 1fr; }
  .split { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .split.tuned, .split.tuned.reverse { grid-template-columns: minmax(0, 1fr); }
  .split.reverse > .split-text { order: 0; }
  .video-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  body { font-size: 16px; }
  .section { padding: 60px 0; }
  .hero { padding-top: 48px; }
  .fig-pair { grid-template-columns: 1fr; gap: 24px; }
  .zoom-inset { width: 42%; }
  .video-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .video-grid > .vslot:last-child:nth-child(odd) { grid-column: 1 / -1; justify-self: center; width: calc(50% - 6px); }
  .combo-matrix { border-spacing: 3px; }
  .combo-matrix td { min-width: 0; height: 46px; font-size: 0.95rem; }
  .combo-matrix thead th { font-size: 0.72rem; }
  .combo-matrix tbody th { white-space: normal; font-size: 0.76rem; padding-right: 4px; }
  .combo-matrix .cell-tag { font-size: 0.6rem; letter-spacing: 0; }
  .explorer { padding: 14px; }
  .mx { --cell: 52px; }
  .mx { --rowhead: 58px; }
  .instr { font-size: 1.05rem; }
  .compare { gap: 10px; }
  .topnav-links a { padding: 6px 8px; font-size: 0.85rem; }
}
@media (max-width: 400px) {
  .mx { --cell: 46px; }
  .mx { --rowhead: 54px; }
}