/* Grid-Bench project site: tokens, shared components, navigation, hero, footer.
   Section-specific styles live in the other files in this folder. */

:root {
  color-scheme: dark;
  --bg: #06080e;
  --bg-soft: #0a0e18;
  --surface: #0d1120;
  --surface-2: #121829;
  --surface-3: #1a2236;
  --line: rgba(160, 180, 220, 0.1);
  --line-strong: rgba(160, 180, 220, 0.2);
  --text: #eef2fa;
  --text-2: #a9b5c9;
  --muted: #7f8ca3;
  --accent: #35d0f0;
  --accent-2: #8b7cf6;
  --accent-3: #e35d9f;
  --accent-ink: #04141c;
  --accent-soft: rgba(53, 208, 240, 0.12);
  --grad: linear-gradient(100deg, #35d0f0 0%, #8b7cf6 52%, #e35d9f 100%);
  --good: #34c88a;
  --bad: #f06a7a;
  --warn: #f2b84b;
  --cell-empty: #121a2c;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 18px 40px -22px rgba(0, 0, 0, 0.85);
  --shadow-lg: 0 2px 6px rgba(0, 0, 0, 0.3), 0 34px 70px -30px rgba(139, 124, 246, 0.5);
  --glow: 0 0 0 1px rgba(53, 208, 240, 0.25), 0 0 30px -6px rgba(53, 208, 240, 0.35);
  --code-bg: #080c17;
  --radius: 18px;
  --radius-sm: 12px;
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Space Grotesk", "Inter", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --wrap: 1180px;
  --gutter: 24px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; -webkit-text-size-adjust: 100%; background: var(--bg); }
body {
  margin: 0;
  color: var(--text);
  font: 400 16px/1.65 var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; color: inherit; }
::selection { background: rgba(139, 124, 246, 0.35); color: var(--text); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.wrap { width: min(var(--wrap), 100% - 2 * var(--gutter)); margin-inline: auto; }
.mono { font-family: var(--font-mono); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.tabnum { font-variant-numeric: tabular-nums; }

/* ---------- Backdrop and scroll progress ---------- */
.backdrop { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: -1; pointer-events: none; }
.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 70; pointer-events: none;
  background: var(--grad); transform-origin: 0 50%; transform: scaleX(0);
}

/* ---------- Navigation: floating pill ---------- */
.nav {
  position: fixed; top: 14px; left: 50%; transform: translateX(-50%); z-index: 60;
  display: flex; align-items: center; gap: 4px; padding: 6px;
  border-radius: 999px; border: 1px solid var(--line-strong);
  background: rgba(13, 17, 32, 0.72);
  backdrop-filter: saturate(160%) blur(16px); -webkit-backdrop-filter: saturate(160%) blur(16px);
  box-shadow: 0 10px 30px -12px rgba(0, 0, 0, 0.7);
  white-space: nowrap;
}
.brand { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; font: 600 15.5px/1 var(--font-display); letter-spacing: -0.01em; padding: 0 12px 0 8px; }
.brand-mark { width: 22px; height: 22px; flex: none; max-width: none; }
.nav-links { display: flex; gap: 2px; }
.nav-links a {
  text-decoration: none; color: var(--text-2); font-size: 14px; font-weight: 500; padding: 8px 14px; border-radius: 999px;
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--text); background: rgba(255, 255, 255, 0.06); }
.nav-links a.is-active { color: var(--bg); background: var(--text); }
.nav-toggle {
  display: none; width: 38px; height: 38px; place-items: center; border-radius: 999px; border: 0; cursor: pointer;
  background: rgba(255, 255, 255, 0.06); color: var(--text);
}
.nav-toggle svg { width: 18px; height: 18px; }
.nav-toggle[aria-expanded="true"] .i-menu, .nav-toggle:not([aria-expanded="true"]) .i-close { display: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; height: 42px; padding: 0 18px;
  border-radius: 999px; border: 1px solid var(--line-strong); background: var(--surface);
  color: var(--text); text-decoration: none; font-size: 14.5px; font-weight: 500; cursor: pointer;
  transition: transform .2s, border-color .2s, background .2s, box-shadow .2s;
  white-space: nowrap;
}
.btn svg { width: 17px; height: 17px; flex: none; }
.btn:hover { border-color: color-mix(in srgb, var(--accent-2) 70%, transparent); transform: translateY(-2px); }
.btn-primary { background: var(--text); color: var(--bg); border-color: transparent; font-weight: 600; }
.btn-primary:hover { box-shadow: var(--shadow-lg); border-color: transparent; }
.btn-sm { height: 34px; padding: 0 14px; font-size: 13.5px; }
.btn-ghost { background: transparent; }
.soon {
  font: 500 10.5px/1 var(--font-mono); text-transform: uppercase; letter-spacing: .06em;
  padding: 4px 7px; border-radius: 999px; background: var(--surface-3); color: var(--muted);
}

/* ---------- Hero ---------- */
.hero { position: relative; padding: 132px 0 28px; overflow-x: clip; }
.hero::before {
  content: ""; position: absolute; z-index: -1; pointer-events: none; inset: -10% -10% auto; height: 820px;
  background:
    radial-gradient(36% 46% at 74% 40%, rgba(53, 208, 240, .13), transparent 70%),
    radial-gradient(30% 40% at 90% 18%, rgba(139, 124, 246, .16), transparent 70%),
    radial-gradient(26% 34% at 60% 70%, rgba(227, 93, 159, .08), transparent 70%);
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.hero h1 { margin: 26px 0 0; font: 700 clamp(58px, 8.4vw, 108px)/0.92 var(--font-display); letter-spacing: -0.045em; color: var(--text); }
.hero .subtitle { margin: 18px 0 0; font: 500 clamp(21px, 2.3vw, 28px)/1.25 var(--font-display); letter-spacing: -0.015em; color: var(--text); max-width: 21em; text-wrap: balance; }
.typed { margin: 12px 0 0; font: 500 clamp(20px, 2.1vw, 26px)/1.3 var(--font-display); letter-spacing: -0.01em; color: var(--text-2); min-height: 1.3em; }
.typed-verb { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.caret { display: inline-block; width: 2px; height: 1.05em; margin-left: 3px; vertical-align: -0.15em; background: var(--accent-3); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.hero .lead { margin: 20px 0 0; font-size: 17.5px; color: var(--text-2); max-width: 31em; }
.hero-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 30px; }
.hero-cta .btn { height: 46px; padding: 0 22px; }
.res {
  display: inline-flex; align-items: center; gap: 2px; height: 46px; padding: 0 6px 0 4px; border-radius: 999px;
  border: 1px solid var(--line-strong); background: color-mix(in srgb, var(--surface) 80%, transparent);
}
.res-item { display: inline-flex; align-items: center; gap: 7px; padding: 0 12px; height: 34px; font-size: 14px; color: var(--text-2); cursor: default; }
.res-item + .res-item { border-left: 1px solid var(--line); }
.res-item[href] { cursor: pointer; text-decoration: none; }
.res-item[href]:hover { color: var(--text); }
.res-item[href]:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.res-item svg { width: 16px; height: 16px; }
.res .soon { margin-left: 4px; }

.hero-visual { position: relative; }
.hero-visual::before {
  content: ""; position: absolute; inset: 8% 6% 14%; z-index: -1; border-radius: 40px; filter: blur(60px); opacity: .45;
  background: var(--grad);
}
.window {
  position: relative; border-radius: 20px; overflow: hidden; border: 1px solid var(--line-strong);
  background: linear-gradient(180deg, #0f1426, #0a0e1a);
  box-shadow: var(--shadow-lg);
  transition: transform .5s cubic-bezier(.2, .7, .2, 1);
  will-change: transform;
}
.win-bar {
  display: flex; align-items: center; gap: 12px; height: 42px; padding: 0 10px 0 14px;
  border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, 0.02);
}
.win-dots { display: flex; gap: 7px; }
.win-dots i { width: 11px; height: 11px; border-radius: 50%; background: #ff5f57; }
.win-dots i:nth-child(2) { background: #febc2e; }
.win-dots i:nth-child(3) { background: #28c840; }
.win-title { flex: 1; min-width: 0; font: 500 12px/1 var(--font-mono); color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.win-tools { display: flex; align-items: center; gap: 6px; }
.win-t { font: 500 12px/1 var(--font-mono); color: var(--muted); margin-right: 4px; }
.win-t b { color: var(--text); font-weight: 600; }
.win-tools button {
  width: 28px; height: 28px; border-radius: 8px; border: 1px solid var(--line); cursor: pointer;
  background: transparent; display: grid; place-items: center; color: var(--text-2);
}
.win-tools button:hover { color: var(--text); border-color: var(--line-strong); }
.win-tools svg { width: 13px; height: 13px; }
.win-stage { position: relative; aspect-ratio: 1 / 0.8; }
.win-stage canvas { width: 100%; height: 100%; cursor: grab; touch-action: pan-y; }
.win-stage canvas:active { cursor: grabbing; }
.win-progress { position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--line); }
.win-progress span { display: block; height: 100%; width: 0; background: var(--grad); transition: width .3s; }
.win-log {
  height: 80px; padding: 10px 14px; display: flex; flex-direction: column; justify-content: flex-end; gap: 3px;
  font: 400 12px/1.5 var(--font-mono); color: var(--muted); background: rgba(3, 5, 10, 0.4); overflow: hidden;
  -webkit-mask-image: linear-gradient(180deg, transparent 0, #000 45%); mask-image: linear-gradient(180deg, transparent 0, #000 45%);
}
.win-log .ln { flex: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.win-log .ln .t { color: #6b7a92; margin-right: 10px; }
.win-log .ln .op { color: var(--accent); }
.win-log .ln.set .op { color: var(--accent-3); }
.win-log .ln.cmt { color: #6b7a92; }
.win-log .ln:last-child { color: var(--text-2); }
.win-log .ln:last-child::after { content: ""; display: inline-block; width: 7px; height: 13px; margin-left: 2px; vertical-align: -2px; background: var(--accent); animation: blink 1s steps(1) infinite; }
.world-caption { margin-top: 14px; font-size: 12.5px; color: var(--muted); text-align: center; }
@media (hover: none), (pointer: coarse) { .drag-hint { display: none; } }

/* Affiliations: full-colour logos on light tiles (each brand's light-background version),
   in the paper's order, drifting left in a loop. main.js clones the list to fill the strip;
   hover pauses it, and reduced motion shows one static, wrapping row. */
.affil { margin-top: 64px; padding-top: 26px; border-top: 1px solid var(--line); display: flex; align-items: center; gap: 18px 32px; }
.affil-label { margin: 0; flex: none; font-size: 13px; color: var(--muted); }
.affil-marquee {
  flex: 1; min-width: 0; overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 7%, #000 93%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 7%, #000 93%, transparent);
}
.affil-track { display: flex; width: max-content; animation: affil-drift var(--dur, 30s) linear infinite; }
.affil-marquee:hover .affil-track, .affil-marquee.is-off .affil-track { animation-play-state: paused; }
@keyframes affil-drift { to { transform: translateX(var(--shift, -50%)); } }
.affil-logos { list-style: none; margin: 0; padding: 0 14px 0 0; display: flex; align-items: center; gap: 14px; }
.affil-logos li {
  flex: none; height: 64px; padding: 0 28px; border-radius: 14px; background: #eef1f5;
  display: flex; align-items: center; box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .6);
}
.affil-logos img { display: block; height: var(--h, 26px); width: auto; }
@media (prefers-reduced-motion: reduce) {
  .affil-marquee { -webkit-mask-image: none; mask-image: none; }
  .affil-track { width: auto; }
  .affil-logos { flex-wrap: wrap; padding: 0; }
}

/* ---------- Sections ---------- */
section.block { padding: 120px 0 0; }
.sec-head { display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: 20px; align-items: start; max-width: 900px; margin-bottom: 44px; }
.sec-num {
  width: 40px; height: 40px; margin-top: 10px; border-radius: 50%; display: grid; place-items: center;
  font: 500 13px/1 var(--font-mono); color: var(--accent);
  border: 1.5px solid color-mix(in srgb, var(--accent) 55%, transparent);
  box-shadow: 0 0 22px -6px color-mix(in srgb, var(--accent) 60%, transparent);
}
.sec-head h2 { margin: 0; font: 700 clamp(38px, 5.2vw, 62px)/1.02 var(--font-display); letter-spacing: -0.035em; text-wrap: balance; }
.sec-head h2 em { font-style: normal; color: var(--text-2); }
/* The gradient stays on the hero's typed verb and the closing call to action only. */
#use .sec-head h2 em { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sec-head p { grid-column: 2; margin: 16px 0 0; color: var(--text-2); font-size: 18px; max-width: 38em; }

.card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.025), rgba(255, 255, 255, 0)) var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.caption { font-size: 13px; color: var(--muted); line-height: 1.55; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; height: 24px; padding: 0 9px; border-radius: 999px;
  font: 500 11.5px/1 var(--font-mono); color: var(--text-2); background: var(--surface-2); border: 1px solid var(--line);
  white-space: nowrap;
}
.label-tag {
  display: inline-flex; align-items: center; gap: 6px; font: 500 11px/1 var(--font-mono); letter-spacing: .04em;
  padding: 6px 9px; border-radius: 999px; border: 1px solid var(--line); color: var(--text-2);
}
.label-tag.ref { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); background: var(--accent-soft); }
.label-tag.err { color: var(--bad); border-color: color-mix(in srgb, var(--bad) 35%, transparent); background: color-mix(in srgb, var(--bad) 10%, transparent); }

/* Segmented control (also used as tabs) */
.seg { display: inline-flex; padding: 3px; gap: 2px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--line); flex-wrap: wrap; }
.seg button {
  border: 0; background: transparent; cursor: pointer; padding: 7px 14px; border-radius: 999px;
  font-size: 13.5px; color: var(--text-2); transition: background .2s, color .2s;
}
.seg button:hover { color: var(--text); }
.seg button[aria-pressed="true"], .seg button[aria-selected="true"] { background: var(--text); color: var(--bg); font-weight: 500; }

/* Disclosure for exact rule and prompt text, collapsed by default. */
details.disclosure { border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--bg-soft); }
details.disclosure > summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; gap: 8px; padding: 10px 14px;
  font-size: 13.5px; color: var(--text-2); user-select: none;
}
details.disclosure > summary::-webkit-details-marker { display: none; }
details.disclosure > summary::before {
  content: ""; width: 7px; height: 7px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg); transition: transform .2s; margin-right: 2px;
}
details.disclosure[open] > summary::before { transform: rotate(45deg); }
details.disclosure > summary:hover { color: var(--text); }
details.disclosure > :not(summary) { margin: 0 14px 14px; }
.rule-text {
  margin: 0; padding: 12px 14px; border-radius: 10px; background: var(--code-bg); color: #c6d3e6;
  font: 400 12.5px/1.65 var(--font-mono); white-space: pre-wrap; word-break: break-word; border: 1px solid var(--line);
}

/* Code blocks */
.code, .rule-text, pre { font-variant-ligatures: none; }
.code {
  position: relative; margin: 0; padding: 14px; border-radius: 12px; background: var(--code-bg); color: #c6d3e6;
  font: 400 12.5px/1.65 var(--font-mono); overflow-x: auto; border: 1px solid var(--line); white-space: pre;
}
.code .k { color: #7dd3fc; }
.code .s { color: #a7f3d0; }
.code:has(.copy) { padding-top: 42px; }
.copy {
  position: absolute; top: 8px; right: 8px; height: 26px; padding: 0 10px; border-radius: 999px; border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.05); color: #a9b8cc; font: 500 11px/1 var(--font-mono); cursor: pointer;
}
.copy:hover { color: #fff; border-color: rgba(255,255,255,.3); }

/* SVG grid cells shared by figures */
.gcell { transition: fill .35s ease; }
.gtext { font-family: var(--font-mono); font-weight: 600; pointer-events: none; }
.gaxis { font-family: var(--font-mono); fill: var(--muted); }

/* Toggle switch */
.toggle { display: inline-flex; align-items: center; gap: 9px; font-size: 13.5px; color: var(--text-2); cursor: pointer; user-select: none; }
.toggle input { appearance: none; width: 34px; height: 20px; border-radius: 20px; background: var(--surface-3); position: relative; cursor: pointer; transition: background .2s; margin: 0; border: 1px solid var(--line); }
.toggle input::after { content: ""; position: absolute; top: 2px; left: 2px; width: 14px; height: 14px; border-radius: 50%; background: var(--text-2); transition: transform .2s, background .2s; }
.toggle input:checked { background: color-mix(in srgb, var(--bad) 55%, transparent); }
.toggle input:checked::after { transform: translateX(14px); background: #fff; }

/* Tooltip singleton */
.tooltip {
  position: fixed; z-index: 80; pointer-events: none; min-width: 170px; max-width: 300px; padding: 10px 12px; border-radius: 12px;
  background: rgba(18, 24, 41, 0.94); border: 1px solid var(--line-strong); box-shadow: var(--shadow);
  font-size: 12.5px; color: var(--text-2); opacity: 0; transform: translateY(4px); transition: opacity .12s, transform .12s;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.tooltip.is-on { opacity: 1; transform: none; }
.tooltip .tt-title { font: 600 12px/1.3 var(--font-mono); color: var(--text); margin-bottom: 6px; }
.tooltip .tt-row { display: grid; grid-template-columns: 14px minmax(0, 1fr) auto; align-items: center; gap: 8px; line-height: 1.75; }
.tooltip .tt-row b { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
.tooltip .tt-key { width: 12px; height: 2px; border-radius: 2px; }
.tooltip .tt-sub { margin-top: 6px; color: var(--muted); font-size: 11.5px; }

/* Info hint: a small (i) that shows method notes in the tooltip. */
.info {
  display: inline-grid; place-items: center; width: 18px; height: 18px; border-radius: 50%; border: 1px solid var(--line-strong);
  font: 600 11px/1 var(--font-mono); color: var(--muted); cursor: help; vertical-align: 1px; background: transparent; padding: 0;
}
.info { position: relative; }
.info::after { content: ""; position: absolute; inset: -9px; border-radius: 50%; } /* 36px hit area */
.info:hover, .info:focus-visible { color: var(--text); border-color: var(--text-2); }

/* ---------- Footer ---------- */
body > footer { margin-top: 140px; border-top: 1px solid var(--line); padding: 30px 0 44px; color: var(--muted); font-size: 13px; background: rgba(6, 8, 14, 0.6); }
.foot { display: flex; justify-content: space-between; gap: 10px 16px; flex-wrap: wrap; align-items: center; }
.foot .brand { font-size: 15px; color: var(--text); padding: 0; }
.foot-note { flex-basis: 100%; margin: 4px 0 0; font-size: 12.5px; color: var(--muted); }

/* ---------- Motion ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.2,1); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation: none !important; }
}

/* ---------- Responsive ---------- */
/* Phones: the moving strip runs edge to edge (the static, reduced-motion row stays in the gutter). */
@media (max-width: 640px) and (prefers-reduced-motion: no-preference) {
  .affil-marquee { margin: 0 calc(-1 * var(--gutter)); }
}
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .hero { padding-top: 112px; }
}
@media (max-width: 940px) {
  .nav { left: 12px; right: 12px; transform: none; justify-content: space-between; padding: 6px 6px 6px 4px; border-radius: 24px; flex-wrap: wrap; }
  .nav-toggle { display: inline-grid; order: 2; }
  .nav-links { display: none; order: 3; flex-basis: 100%; flex-direction: column; gap: 2px; padding: 6px 2px 4px; }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 11px 14px; font-size: 15px; }
  section.block { padding-top: 96px; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .hero { padding-top: 96px; }
  .sec-head { grid-template-columns: minmax(0, 1fr); }
  .sec-num { margin: 0 0 14px; }
  .sec-head p { grid-column: 1; font-size: 16.5px; }
  .hero-cta .btn { flex: 1 1 100%; justify-content: center; }
  .res { width: 100%; justify-content: center; }
  .res-item { padding: 0 9px; }
  .affil { margin-top: 44px; gap: 14px; flex-direction: column; align-items: stretch; }
  .affil-logos { gap: 10px; padding-right: 10px; }
  .affil-logos li { height: 54px; padding: 0 20px; border-radius: 12px; }
  .affil-logos img { height: calc(var(--h, 26px) * 0.84); }
  .win-log { height: 76px; font-size: 11px; }
  .win-src { display: none; }
  .win-tools button { width: 36px; height: 36px; }
}