/* Sample-session showcase — styled to the openrobot report-paper system:
   light surfaces, single cobalt accent, Inter Tight + JetBrains Mono,
   hairline dividers, sharp corners, flat. */
:root {
  --bg: oklch(98.5% 0.006 255);
  --bg-elevated: oklch(96.3% 0.009 255);
  --bg-elevated-2: oklch(93.8% 0.012 255);
  --fg: oklch(18% 0.018 255);
  --fg-secondary: oklch(39% 0.018 255);
  --fg-tertiary: oklch(55% 0.016 255);
  --fg-quaternary: oklch(72% 0.012 255);
  --border: oklch(87.5% 0.012 255);
  --border-bright: oklch(76% 0.02 255);
  --accent: oklch(55% 0.19 256);
  --accent-strong: oklch(49% 0.22 256);
  --accent-glow: rgba(106, 163, 255, 0.16);

  /* chart layer */
  --trace-x: oklch(26% 0.03 256);
  --trace-y: oklch(48% 0.04 256);
  --trace-z: oklch(66% 0.035 256);
  --chart-grid: oklch(91% 0.01 255);
  --chart-zero: oklch(82% 0.014 255);
  --chart-label: oklch(62% 0.014 255);

  --max-w: 1080px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
  --sans: "Inter Tight", "Inter", system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { background: var(--bg); color-scheme: light; }
body {
  background: var(--bg); color: var(--fg);
  font-family: var(--sans); line-height: 1.5;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--accent-strong); color: var(--bg); }
.serif {
  font-family: "Instrument Serif", "Newsreader", serif;
  font-style: italic; font-weight: 400; letter-spacing: -0.015em;
}

/* ---- nav ---- */
.nav {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; padding: 18px 24px;
  background: rgba(250, 251, 248, 0.88);
  backdrop-filter: blur(18px) saturate(120%);
  -webkit-backdrop-filter: blur(18px) saturate(120%);
  border-bottom: 1px solid var(--border);
}
.nav-brand {
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--fg); text-decoration: none;
  display: inline-flex; align-items: center;
}
.nav-brand .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  margin-right: 11px; box-shadow: 0 0 12px var(--accent-glow);
}
.nav-back {
  font-size: 14px; font-weight: 500;
  color: var(--fg-secondary); text-decoration: none;
  transition: color 200ms var(--ease-out);
}
.nav-back:hover { color: var(--accent); }
.nav-back:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---- layout ---- */
main { max-width: var(--max-w); margin: 0 auto; padding: 0 24px 96px; }
@media (min-width: 768px) { main { padding: 0 48px 112px; } }

/* ---- hero ---- */
.hero { padding: 72px 0 44px; max-width: 720px; }
.eyebrow {
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: 0.22em; text-transform: uppercase; color: var(--fg-secondary);
  margin: 0 0 28px; display: inline-flex; align-items: center; gap: 12px;
}
.eyebrow .pulse {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(106,163,255,0.5); }
  50% { box-shadow: 0 0 0 10px rgba(106,163,255,0); }
}
.hero h1 {
  font-family: var(--sans); font-size: clamp(34px, 5.4vw, 60px);
  font-weight: 500; letter-spacing: -0.035em; line-height: 1.02;
  color: var(--fg); margin: 0 0 22px;
}
.hero-sub {
  font-size: clamp(15px, 1.5vw, 17px); line-height: 1.6;
  color: var(--fg-secondary); max-width: 60ch; margin: 0;
}

/* ---- stage ---- */
.stage { display: flex; flex-direction: column; gap: 14px; }
.video-wrap {
  position: relative; background: #000; aspect-ratio: 16 / 9;
  border: 1px solid var(--border-bright); overflow: hidden;
}
.video-wrap video { width: 100%; height: 100%; display: block; }
.big-play {
  position: absolute; inset: 0; margin: auto;
  width: 76px; height: 76px; border-radius: 50%;
  background: rgba(20,24,30,0.5); border: 1px solid rgba(255,255,255,0.4);
  color: #fff; cursor: pointer; display: flex; align-items: center;
  justify-content: center; transition: 0.16s var(--ease-out);
  backdrop-filter: blur(4px);
}
.big-play svg { width: 30px; height: 30px; margin-left: 4px; }
.big-play:hover { background: var(--accent); transform: scale(1.05); }
.big-play.hidden { display: none; }

/* ---- telemetry panel ---- */
.telemetry { background: var(--bg-elevated); border: 1px solid var(--border-bright); }
.telemetry-head {
  display: flex; align-items: baseline; gap: 8px;
  padding: 13px 18px; border-bottom: 1px solid var(--border);
}
.telemetry-title {
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--fg);
}
.telemetry-sub { font-size: 12.5px; color: var(--fg-tertiary); }
.clock {
  margin-left: auto; font-family: var(--mono); font-size: 15px;
  font-weight: 500; color: var(--accent); font-variant-numeric: tabular-nums;
}
.clock i { font-style: normal; color: var(--fg-quaternary); font-size: 11px; }

.trace { padding: 12px 18px 6px; cursor: crosshair; touch-action: none; }
.trace:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.trace-label { display: flex; align-items: baseline; gap: 8px; margin-bottom: 4px; }
.trace-name {
  font-family: var(--mono); font-size: 11.5px; font-weight: 500;
  letter-spacing: 0.07em; text-transform: uppercase; color: var(--fg);
}
.trace-unit { font-family: var(--mono); font-size: 11px; color: var(--fg-tertiary); }
.readout { margin-left: auto; display: flex; gap: 14px; }
.readout .ax {
  font-family: var(--mono); font-size: 10.5px; color: var(--fg-tertiary);
  letter-spacing: 0.04em; display: inline-flex; align-items: center; gap: 5px;
}
.readout .ax::before { content: ""; width: 8px; height: 3px; display: inline-block; }
.ax-x::before { background: var(--trace-x); }
.ax-y::before { background: var(--trace-y); }
.ax-z::before { background: var(--trace-z); }
.readout .ax b {
  color: var(--fg); font-weight: 500; min-width: 50px; text-align: right;
  font-variant-numeric: tabular-nums;
}
.canvas-box { position: relative; width: 100%; height: 130px; }
#gyroTrace .canvas-box { height: 146px; }
.canvas-box canvas { width: 100%; height: 100%; display: block; cursor: inherit; }
.telemetry-foot {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--fg-quaternary);
  text-align: center; padding: 8px 0 13px;
}

/* ---- section label ---- */
.section-label {
  font-family: var(--mono); font-size: 11px; font-weight: 400;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--fg-secondary);
  margin: 0 0 18px;
}

/* ---- recordings reel ---- */
.reel { margin-top: 56px; }
.filmstrip { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
@media (max-width: 720px) { .filmstrip { grid-template-columns: repeat(3, 1fr); } }
.clip-thumb {
  position: relative; padding: 0; cursor: pointer; background: var(--bg-elevated);
  border: 1px solid var(--border-bright); overflow: hidden;
  font: inherit; color: var(--fg-tertiary);
  transition: border-color 180ms var(--ease-out);
}
.clip-thumb img {
  width: 100%; aspect-ratio: 16 / 9; object-fit: cover; display: block;
  filter: grayscale(0.4); opacity: 0.78; transition: 0.18s var(--ease-out);
}
.clip-thumb .thumb-label {
  display: block; padding: 7px 9px; font-family: var(--mono);
  font-size: 10.5px; font-weight: 500; letter-spacing: 0.08em;
  text-transform: uppercase; text-align: left;
}
.clip-thumb:hover { border-color: var(--accent); }
.clip-thumb:hover img { opacity: 0.95; filter: grayscale(0); }
.clip-thumb.active { border-color: var(--accent); color: var(--accent); }
.clip-thumb.active img { opacity: 1; filter: grayscale(0); }

/* ---- session parameters (spec table) ---- */
.spec-block { margin-top: 56px; }
.spec-table { border-left: 2px solid var(--accent); }
.spec-row {
  display: grid; grid-template-columns: 1fr 1fr;
  padding: 13px 16px; border-bottom: 1px solid var(--border);
  transition: background 0.1s ease;
}
.spec-row:last-child { border-bottom: none; }
.spec-row:hover { background: var(--bg-elevated); }
.spec-row .spec-label {
  font-family: var(--mono); font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.04em; color: var(--fg-tertiary);
}
.spec-row .spec-value {
  font-family: var(--mono); font-size: 12px; color: var(--fg);
  font-variant-numeric: tabular-nums;
}

/* ---- footer ---- */
.site-footer {
  max-width: var(--max-w); margin: 64px auto 0;
  padding: 26px 24px 56px; border-top: 1px solid var(--border);
  display: flex; gap: 14px; align-items: baseline; flex-wrap: wrap;
  font-size: 12.5px; color: var(--fg-tertiary);
}
@media (min-width: 768px) { .site-footer { padding-left: 48px; padding-right: 48px; } }
.site-footer .nav-brand { color: var(--fg-secondary); }