/* OpenLiDARViewer — openlidarviewer.org
   One design system for the landing page, the guide and the science page.
   Tokens follow the viewer's own 01-tokens.css so site and app read as one product. */

@font-face { font-family: "Manrope"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/manrope-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Manrope"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/manrope-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "Manrope"; font-style: normal; font-weight: 700; font-display: swap; src: url("../fonts/manrope-latin-700-normal.woff2") format("woff2"); }
@font-face { font-family: "Manrope"; font-style: normal; font-weight: 800; font-display: swap; src: url("../fonts/manrope-latin-800-normal.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/jetbrains-mono-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/jetbrains-mono-latin-600-normal.woff2") format("woff2"); }

:root {
  color-scheme: dark;
  --font: "Manrope", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --bg-deep: #03060d;
  --bg: #060b17;
  --bg-raise: #0a1222;
  --panel: rgba(10, 20, 40, .62);
  --panel-strong: rgba(9, 18, 36, .92);
  --line: rgba(146, 176, 214, .13);
  --line-strong: rgba(146, 176, 214, .28);

  --ink: #eaf2fc;
  --ink-2: #c3d2e6;
  --muted: #8ea0b8;
  --dim: #5c6f89;

  --cyan: #1fe4ff;
  --cyan-2: #74f0ff;
  --teal: #4fe8b3;
  --blue: #3f8dff;
  --electric: #0060ff;
  --amber: #f6bb4f;
  --red: #ff6b7a;
  --good: var(--teal);

  --glow-cyan: 0 0 24px rgba(31, 228, 255, .35);
  --shadow-1: 0 10px 30px rgba(0, 0, 0, .35);
  --shadow-2: 0 30px 90px rgba(0, 0, 0, .55);

  --r-xs: 4px;
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 18px;
  --r-xl: 26px;

  --ease: cubic-bezier(.2, .8, .2, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);

  --header-h: 68px;
  --rail-w: 236px;
  --content-max: 1360px;
  --gutter: clamp(20px, 4vw, 56px);
  --anchor-offset: calc(var(--header-h) + 34px);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: auto; scroll-padding-top: var(--anchor-offset); background: var(--bg-deep); -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh;
  font: 400 17px/1.65 var(--font); color: var(--ink-2);
  background: var(--bg-deep);
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  touch-action: manipulation; -webkit-tap-highlight-color: transparent;
}
img, svg, video, canvas { display: block; max-width: 100%; }
img.framed, .console-viewport img, .gallery-stage img { outline: 1px solid rgba(255,255,255,.1); outline-offset: -1px; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }
::selection { background: rgba(31, 228, 255, .28); color: #fff; }
h1, h2, h3, h4 { margin: 0; color: var(--ink); font-weight: 800; letter-spacing: -.035em; line-height: 1.02; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
.mono { font-family: var(--mono); }
.num { font-variant-numeric: tabular-nums; }
kbd, .kbd { font: 600 11px/1 var(--mono); padding: 5px 7px 4px; border: 1px solid var(--line-strong); border-bottom-width: 2px; border-radius: 6px; background: rgba(255,255,255,.04); color: var(--ink-2); white-space: nowrap; }

.skip-link { position: fixed; left: 16px; top: -60px; z-index: 300; padding: 10px 14px; border-radius: 8px; background: var(--cyan); color: #04121a; font-weight: 700; transition: top .2s; }
.skip-link:focus { top: 14px; }

/* ---------- atmosphere ---------- */
.point-field { position: fixed; inset: 0; z-index: -3; width: 100%; height: 100%; opacity: .55; pointer-events: none; }
.aurora { position: fixed; z-index: -4; width: 56vw; height: 56vw; max-width: 900px; max-height: 900px; border-radius: 50%; filter: blur(110px); opacity: .13; pointer-events: none; }
.aurora-a { top: -22vw; right: -12vw; background: radial-gradient(circle, var(--electric), transparent 68%); }
.aurora-b { bottom: -30vw; left: -18vw; background: radial-gradient(circle, rgba(31,228,255,.9), transparent 66%); }
.grain { position: fixed; inset: 0; z-index: 60; pointer-events: none; opacity: .032; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.95' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.8'/%3E%3C/svg%3E"); }
.scroll-progress { position: fixed; z-index: 120; top: 0; left: 0; height: 2px; width: 100%; transform: scaleX(0); transform-origin: left; background: linear-gradient(90deg, var(--blue), var(--cyan), var(--teal)); box-shadow: 0 0 16px var(--cyan); }

/* ---------- top bar ---------- */
.topbar {
  position: fixed; z-index: 100; inset: 0 0 auto 0; height: var(--header-h);
  display: flex; align-items: center; gap: 18px; padding: 0 max(var(--gutter), env(safe-area-inset-right)) 0 max(var(--gutter), env(safe-area-inset-left));
  border-bottom: 1px solid transparent; background: linear-gradient(180deg, rgba(3,6,13,.85), rgba(3,6,13,.55));
  backdrop-filter: blur(18px) saturate(1.3); -webkit-backdrop-filter: blur(18px) saturate(1.3);
  transition: border-color .3s, background .3s;
}
.topbar.scrolled { border-color: var(--line); background: rgba(3,6,13,.9); }
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; min-height: 44px; }
.brand img { width: 40px; height: 40px; filter: drop-shadow(0 0 10px rgba(31,228,255,.35)); }
.brand-copy { display: grid; line-height: 1.05; }
.brand-copy strong { color: var(--ink); font-size: 15.5px; font-weight: 800; letter-spacing: -.02em; }
.brand-copy small { font: 600 9.5px/1 var(--mono); letter-spacing: .16em; color: var(--cyan); margin-top: 4px; }
.topnav { display: flex; gap: 2px; margin-left: 14px; }
.topnav a { position: relative; padding: 9px 13px; border-radius: 8px; color: var(--ink-2); font-size: 14px; font-weight: 600; transition: color .2s, background .2s; }
.topnav a:hover, .topnav a[aria-current="page"] { color: var(--ink); background: rgba(255,255,255,.05); }
.topnav a[aria-current="page"]::after { content: ""; position: absolute; left: 13px; right: 13px; bottom: 4px; height: 1px; background: var(--cyan); box-shadow: 0 0 8px var(--cyan); }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.icon-button { display: inline-flex; align-items: center; gap: 8px; height: 38px; padding: 0 12px; border: 1px solid var(--line); border-radius: 9px; background: rgba(255,255,255,.03); color: var(--ink-2); font-size: 13.5px; font-weight: 600; transition: border-color .2s, background .2s, color .2s; }
.icon-button:hover { border-color: var(--line-strong); background: rgba(255,255,255,.06); color: var(--ink); }
.icon-button svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 2; }
.icon-button kbd { margin-left: 2px; }
.menu-button { display: none; width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 9px; background: transparent; padding: 11px 10px; }
.menu-button span { display: block; height: 1.5px; background: var(--ink-2); margin: 4px 0; transition: transform .25s, opacity .25s; }
.menu-button[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.menu-button[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-button[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }
.mobile-nav { position: fixed; z-index: 96; top: var(--header-h); inset-inline: 0; display: grid; padding: 12px max(var(--gutter), env(safe-area-inset-right)) calc(26px + env(safe-area-inset-bottom)) max(var(--gutter), env(safe-area-inset-left)); background: rgba(3,6,13,.97); border-bottom: 1px solid var(--line); backdrop-filter: blur(20px); max-height: calc(100vh - var(--header-h)); overflow-y: auto; overscroll-behavior: contain; }
.mobile-nav[hidden] { display: none; }
.mobile-nav a { padding: 13px 4px; border-bottom: 1px solid var(--line); color: var(--ink); font-weight: 600; }
.mobile-nav a:last-child { border-bottom: 0; }

/* ---------- buttons ---------- */
.btn {
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 50px; padding: 0 22px; border: 1px solid var(--line-strong); border-radius: 11px;
  font-size: 14px; font-weight: 700; letter-spacing: -.01em; color: var(--ink); background: rgba(255,255,255,.035);
  overflow: hidden; isolation: isolate;
  transition: transform .3s var(--ease), border-color .25s, box-shadow .3s, background .25s;
}
.btn:hover { transform: translateY(-2px); border-color: var(--cyan); box-shadow: 0 10px 30px rgba(0,0,0,.3), 0 0 0 1px rgba(31,228,255,.15) inset; }
.btn:active { transform: scale(.96); transition-duration: .08s; }
.btn-primary { border-color: transparent; color: #031018; background: linear-gradient(120deg, var(--cyan-2), var(--cyan) 45%, var(--teal)); }
.btn-primary:hover { box-shadow: var(--glow-cyan), 0 14px 34px rgba(31,228,255,.22); }
.btn-primary::after { content: ""; position: absolute; inset: 0; background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,.5) 50%, transparent 70%); transform: translateX(-120%); transition: transform .7s var(--ease); }
.btn-primary:hover::after { transform: translateX(120%); }
.btn-ghost { background: transparent; }
.btn svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.btn-sm { min-height: 40px; padding: 0 14px; font-size: 13px; border-radius: 9px; }
.text-link { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; margin: -10px 0; color: var(--cyan); font-weight: 700; font-size: 14px; }
.text-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.micro-ripple { position: absolute; z-index: 0; border-radius: 50%; background: rgba(255,255,255,.25); transform: translate(-50%,-50%) scale(0); animation: ripple .55s var(--ease) forwards; pointer-events: none; }
@keyframes ripple { to { transform: translate(-50%,-50%) scale(1); opacity: 0; } }

/* ---------- layout primitives ---------- */
.wrap { width: min(100% - var(--gutter) * 2, var(--content-max)); margin-inline: auto; min-width: 0; }
main { padding-left: env(safe-area-inset-left); padding-right: env(safe-area-inset-right); }
.section { position: relative; padding: clamp(88px, 10vw, 160px) 0; }
.section + .section::before { content: ""; position: absolute; top: 0; left: 50%; width: min(100%, 1200px); height: 1px; transform: translateX(-50%); background: linear-gradient(90deg, transparent, var(--line-strong), transparent); }
.section-head { display: grid; gap: 18px; max-width: 820px; margin-bottom: clamp(44px, 6vw, 80px); }
.section-head.split { max-width: none; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); align-items: end; gap: 40px; }
.section-head h2 { font-size: clamp(34px, 4.2vw, 58px); }
.section-head p { font-size: 17px; line-height: 1.7; color: var(--muted); max-width: 640px; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; font: 600 10.5px/1 var(--mono); letter-spacing: .2em; color: var(--cyan); text-transform: uppercase; }
.eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--cyan); box-shadow: 0 0 8px var(--cyan); transform-origin: left; }
@supports (animation-timeline: view()) {
  .eyebrow::before { animation: ruleDraw linear both; animation-timeline: view(); animation-range: entry 0% entry 45%; }
  @keyframes ruleDraw { from { transform: scaleX(0); } to { transform: scaleX(1); } }
}
.eyebrow .idx { color: var(--dim); letter-spacing: .1em; }
.grid { display: grid; gap: 14px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  position: relative; padding: 32px 30px; border: 1px solid var(--line); border-radius: var(--r-lg);
  background: linear-gradient(150deg, rgba(14, 26, 52, .66), rgba(6, 12, 26, .7));
  overflow: hidden; isolation: isolate;
  transition: transform .4s var(--ease), border-color .3s, box-shadow .4s;
}
.card:hover { transform: translateY(-4px); border-color: rgba(31,228,255,.3); box-shadow: var(--shadow-1); }
.card::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: linear-gradient(90deg, transparent, var(--cyan), transparent); transform: scaleX(0); transition: transform .4s var(--ease); }
.card:hover::after { transform: scaleX(1); }
.card h3 { font-size: 19px; letter-spacing: -.02em; margin: 14px 0 10px; }
.card p { color: var(--muted); font-size: 14.5px; line-height: 1.65; }
.card .idx { position: absolute; top: 20px; right: 20px; font: 600 10px/1 var(--mono); letter-spacing: .14em; color: var(--dim); }
.card-icon { width: 44px; height: 44px; display: grid; place-items: center; border: 1px solid rgba(31,228,255,.2); border-radius: 12px; background: rgba(31,228,255,.06); color: var(--cyan); }
.card-icon svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.micro-glow { position: absolute; z-index: -1; left: var(--glow-x, 50%); top: var(--glow-y, 50%); width: 320px; height: 320px; transform: translate(-50%,-50%); border-radius: 50%; background: radial-gradient(circle, rgba(31,228,255,.14), transparent 62%); opacity: 0; transition: opacity .35s; pointer-events: none; }
.card:hover .micro-glow, [data-glow]:hover .micro-glow { opacity: 1; }

.glass { border: 1px solid var(--line); border-radius: var(--r-lg); background: rgba(8, 15, 30, .55); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }

.chip { display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; border: 1px solid var(--line); border-radius: 6px; background: rgba(255,255,255,.03); font: 600 11.5px/1 var(--mono); letter-spacing: .04em; color: var(--ink-2); white-space: nowrap; }
.chip.cyan { color: var(--cyan); border-color: rgba(31,228,255,.3); background: rgba(31,228,255,.06); }
.chip.teal { color: var(--teal); border-color: rgba(79,232,179,.3); background: rgba(79,232,179,.06); }
.chip.amber { color: var(--amber); border-color: rgba(246,187,79,.3); background: rgba(246,187,79,.06); }
.chip.red { color: var(--red); border-color: rgba(255,107,122,.3); background: rgba(255,107,122,.06); }
.chip.new { color: #04121a; border-color: transparent; background: linear-gradient(120deg, var(--cyan-2), var(--cyan) 60%, var(--teal)); font-weight: 700; }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }

.stat { display: grid; gap: 6px; }
.stat strong { font-size: clamp(38px, 4.4vw, 60px); font-weight: 800; letter-spacing: -.05em; line-height: 1; color: var(--ink); font-variant-numeric: tabular-nums; }
.stat strong em { font-style: normal; font-size: .5em; color: var(--cyan); letter-spacing: -.02em; vertical-align: .3em; margin-left: 4px; }
.stat strong span { font: inherit; letter-spacing: inherit; color: inherit; text-transform: none; }
.stat > span { font: 600 10.5px/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--dim); }
.stat small { font-size: 13px; color: var(--muted); }

.table { width: 100%; border-collapse: collapse; font-size: 15px; }
.table th, .table td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table tbody tr { transition: background-color .15s; }
.table tbody tr:hover { background: rgba(31,228,255,.05); }
.table tbody tr:hover td:nth-child(2) { color: var(--cyan); }
.table th { font: 600 10.5px/1.2 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--dim); }
.table td:first-child { color: var(--ink); font-weight: 600; white-space: nowrap; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; min-width: 0; border: 1px solid var(--line); border-radius: var(--r-md); background: rgba(6,12,26,.5); }
.table-wrap .table { min-width: 720px; }

.callout { display: grid; grid-template-columns: auto 1fr; gap: 14px; padding: 18px 20px; border: 1px solid rgba(246,187,79,.28); border-left-width: 3px; border-radius: 10px; background: rgba(246,187,79,.06); color: var(--ink-2); font-size: 14.5px; line-height: 1.6; }
.callout.cyan { border-color: rgba(31,228,255,.3); background: rgba(31,228,255,.05); }
.callout.red { border-color: rgba(255,107,122,.3); background: rgba(255,107,122,.05); }
.callout b { color: var(--ink); }
.callout svg { width: 18px; height: 18px; margin-top: 3px; stroke: currentColor; fill: none; stroke-width: 2; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .8s var(--ease-out), transform .8s var(--ease-out); transition-delay: var(--delay, 0ms); }
.reveal.visible { opacity: 1; transform: none; }
.reveal-scale { opacity: 0; transform: scale(.96) translateY(14px); transition: opacity .9s var(--ease-out), transform .9s var(--ease-out); transition-delay: var(--delay, 0ms); }
.reveal-scale.visible { opacity: 1; transform: none; }

/* split-text headline entrance */
.split-words .w { display: inline-block; overflow: hidden; vertical-align: bottom; }
.split-words .w > span { display: inline-block; transform: translateY(110%); transition: transform .9s var(--ease-out); transition-delay: calc(var(--i) * 55ms); }
.split-words.visible .w > span { transform: none; }

/* ---------- footer ---------- */
.footer { position: relative; padding: 96px 0 56px; border-top: 1px solid var(--line); background: linear-gradient(180deg, transparent, rgba(3,6,13,.8)); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 32px; }
.footer h4 { font: 600 10.5px/1 var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--dim); margin-bottom: 16px; }
.footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer li a { display: inline-block; padding: 12px 0; margin: -9px 0; color: var(--ink-2); font-size: 14px; background: linear-gradient(currentColor, currentColor) no-repeat 0 calc(100% - 11px) / 0 1px; transition: background-size .2s var(--ease-out), color .2s; }
.footer li a:hover { background-size: 100% 1px; }
.footer li a:hover { color: var(--cyan); }
.footer-brand p { margin-top: 14px; color: var(--muted); font-size: 14px; max-width: 360px; }
.colophon { margin-top: 40px; color: var(--dim); font: 500 12px/1.7 var(--mono); max-width: 720px; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 14px 28px; justify-content: space-between; align-items: center; margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--dim); font: 500 12px/1.5 var(--mono); }
.footer-bottom a { color: var(--muted); }
.footer-bottom a:hover { color: var(--cyan); }

/* ---------- command palette ---------- */
.command-palette { position: fixed; inset: 0; z-index: 400; width: min(92vw, 640px); margin: 12vh auto auto; padding: 0; border: 1px solid var(--line-strong); border-radius: 18px; background: var(--panel-strong); color: var(--ink); box-shadow: var(--shadow-2); backdrop-filter: blur(24px); overflow: hidden; }
.command-palette::backdrop { background: rgba(2,4,10,.7); backdrop-filter: blur(6px); }
.command-head { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 12px; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.command-head svg { width: 18px; height: 18px; stroke: var(--dim); fill: none; stroke-width: 2; }
.command-head:focus-within { box-shadow: inset 0 -1px 0 var(--cyan); }
.command-head input { min-width: 0; border: 0; background: transparent; color: var(--ink); font: 500 16px var(--font); outline: none; }
.command-head input::placeholder { color: var(--dim); }
.command-head button { position: relative; padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px; background: transparent; font: 600 10.5px var(--mono); color: var(--dim); }
.command-results { max-height: 52vh; overflow-y: auto; overscroll-behavior: contain; padding: 8px; }
.command-item { display: grid; grid-template-columns: 38px 1fr auto; align-items: center; gap: 12px; width: 100%; padding: 10px 12px; border: 0; border-radius: 10px; background: transparent; text-align: left; }
.command-item b { font: 600 10.5px var(--mono); letter-spacing: .1em; color: var(--dim); }
.command-item strong { display: block; color: var(--ink); font-size: 14.5px; font-weight: 700; }
.command-item small { display: block; color: var(--muted); font-size: 12.5px; }
.command-item > span:last-child { color: var(--dim); font-family: var(--mono); font-size: 12px; }
.command-item.selected, .command-item:hover { background: rgba(31,228,255,.08); }
.command-item.selected b { color: var(--cyan); }
.command-empty { padding: 26px 14px; text-align: center; color: var(--dim); font-size: 14px; }
.command-head button::after { content: ""; position: absolute; inset: -8px; }
.runtime-toggle { min-width: 44px; }
.command-foot { display: flex; gap: 16px; padding: 10px 14px; border-top: 1px solid var(--line); color: var(--dim); font: 500 11px var(--mono); }

/* ---------- tooltip ---------- */
.tooltip { position: fixed; z-index: 500; max-width: 280px; padding: 8px 11px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--panel-strong); color: var(--ink-2); font-size: 12.5px; line-height: 1.5; box-shadow: var(--shadow-1); pointer-events: none; }

/* ---------- section rail (guide / science) ---------- */
.section-rail { position: fixed; z-index: 40; left: 0; top: var(--header-h); bottom: 0; width: var(--rail-w); padding: 34px 22px 26px; border-right: 1px solid var(--line); background: linear-gradient(180deg, rgba(4,8,18,.7), rgba(3,6,13,.9)); overflow-y: auto; overscroll-behavior: contain; }
.rail-label { font: 600 10px/1 var(--mono); letter-spacing: .22em; color: var(--cyan); margin-bottom: 20px; }
.section-rail nav { display: grid; gap: 2px; }
.section-rail nav a { display: grid; grid-template-columns: 26px 1fr; align-items: center; gap: 8px; padding: 9px 10px; border-radius: 8px; color: var(--muted); font-size: 13.5px; font-weight: 600; transition: color .2s, background .2s; }
.section-rail nav a span { font: 600 10px var(--mono); color: var(--dim); letter-spacing: .06em; }
.section-rail nav a:hover { color: var(--ink); background: rgba(255,255,255,.04); }
.section-rail nav a.active { color: var(--ink); background: rgba(31,228,255,.08); box-shadow: inset 2px 0 0 var(--cyan); }
.section-rail nav a.active span { color: var(--cyan); }
.rail-status { display: grid; grid-template-columns: auto 1fr; gap: 10px; margin-top: 26px; padding: 14px; border: 1px solid var(--line); border-radius: 10px; background: rgba(255,255,255,.02); }
.rail-status strong { display: block; font: 600 10.5px/1.2 var(--mono); letter-spacing: .12em; color: var(--ink); }
.rail-status small { color: var(--dim); font-size: 11.5px; }
.status-dot { width: 7px; height: 7px; margin-top: 4px; border-radius: 50%; background: var(--good); box-shadow: 0 0 10px var(--good); animation: pulse 2.2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
.has-rail main { padding-left: var(--rail-w); }
.has-rail .wrap { width: min(100% - var(--gutter) * 2, 1180px); }
.section-anchor { scroll-margin-top: 0; }
.section-anchor[tabindex="-1"]:focus { outline: none; }

/* ---------- runtime HUD ---------- */
.runtime-hud { position: fixed; z-index: 45; right: 20px; bottom: 20px; display: flex; align-items: stretch; border: 1px solid var(--line); border-radius: 10px; background: rgba(6,12,26,.86); backdrop-filter: blur(12px); box-shadow: var(--shadow-1); overflow: hidden; }
.runtime-toggle { padding: 0 14px; border: 0; border-right: 1px solid var(--line); background: rgba(31,228,255,.06); color: var(--cyan); font: 600 10.5px var(--mono); letter-spacing: .14em; }
.runtime-grid { display: flex; }
.runtime-grid > span { display: grid; gap: 3px; padding: 9px 14px; border-right: 1px solid var(--line); }
.runtime-grid > span:last-child { border-right: 0; }
.runtime-grid small { font: 500 8.5px/1 var(--mono); letter-spacing: .14em; color: var(--dim); }
.runtime-grid strong { font: 600 11px/1 var(--mono); color: var(--ink); white-space: nowrap; }
.runtime-hud.collapsed .runtime-grid { display: none; }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .section-rail { display: none; }
  .has-rail main { padding-left: 0; }
}
@media (max-width: 900px) {
  .topnav { display: none; }
  .menu-button { display: block; }
  .grid-3 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .section-head.split { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .runtime-hud { display: none; }
}
@media (max-width: 1100px) {
  .btn-sm { min-height: 44px; }
}
@media (max-width: 900px) {
  .icon-button, .menu-button { width: 44px; height: 44px; }
  .icon-button { padding: 0; justify-content: center; }
  .icon-button span, .icon-button kbd { display: none; }
}
@media (max-width: 640px) {
  :root { --header-h: 62px; --anchor-offset: calc(var(--header-h) + 24px); }
  .eyebrow { font-size: 11px; }
  .chip { font-size: 12px; }
  .stat > span, .table th, .rail-label { font-size: 11px; }
  .footer-bottom { font-size: 12.5px; }
  .brand-copy small { display: none; }
  .top-actions .btn { display: none; }
  .icon-button span, .icon-button kbd { display: none; }
  .icon-button { width: 44px; padding: 0; justify-content: center; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .section { padding: 64px 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
  .reveal, .reveal-scale, .split-words .w > span { opacity: 1; transform: none; }
  .point-field { display: none; }
}