/* Hallmark · macrostructure: Workbench · F2 sticky-scroll knobs: pinned=right, content=trace-panel, steps=3
 * theme: custom · vibe: "industrial precision, cool, technical" · paper: oklch(13% 0.012 220) · accent: oklch(72% 0.16 220)
 * display: Geist Mono 500 · body: Geist · axes: dark / mono / cool
 * studied: no · context: explicit · v0.7.0
 */

:root {
  /* Custom palette — dark cool, sea-blue anchor */
  --color-paper: oklch(13% 0.012 220);
  --color-paper-2: oklch(17% 0.014 220);
  --color-paper-3: oklch(22% 0.014 220);
  --color-rule: oklch(30% 0.012 220);
  --color-rule-2: oklch(26% 0.012 220);
  --color-muted: oklch(58% 0.012 220);
  --color-neutral: oklch(50% 0.012 220);
  --color-ink: oklch(94% 0.010 220);
  --color-ink-2: oklch(72% 0.010 220);
  --color-accent: oklch(72% 0.16 220);
  --color-accent-ink: oklch(13% 0.012 220);
  --color-focus: oklch(78% 0.20 220);
  --color-warn: oklch(72% 0.16 70);
  --color-error: oklch(64% 0.18 28);

  /* Single-family pair: Geist Mono display + Geist body — same family, different widths */
  --font-display: "Geist Mono", "JetBrains Mono", ui-monospace, monospace;
  --font-body: "Geist", "Inter Tight", -apple-system, sans-serif;
  --font-mono: "Geist Mono", "JetBrains Mono", ui-monospace, monospace;

  --space-3xs: 0.25rem;
  --space-2xs: 0.5rem;
  --space-xs: 0.75rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4.5rem;
  --space-3xl: 6.5rem;

  --ease-out: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-micro: 100ms;
  --dur-short: 200ms;
}

* { box-sizing: border-box; }
html, body { overflow-x: clip; }

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.page { max-width: 80rem; margin: 0 auto; padding: 0 var(--space-lg); }

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
  border-block-end: 1px solid var(--color-rule);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--color-ink-2);
}

.masthead__brand { color: var(--color-ink); font-weight: 500; }
.masthead__brand .dot {
  display: inline-block;
  width: 0.55ch;
  height: 0.55ch;
  background: var(--color-accent);
  border-radius: 50%;
  margin-inline-end: 0.5ch;
  vertical-align: 0.1em;
}

.masthead__nav { display: flex; gap: var(--space-md); }
.masthead__nav a {
  color: var(--color-ink-2);
  text-decoration: none;
  transition: color var(--dur-micro) var(--ease-out);
}
.masthead__nav a:hover, .masthead__nav a:focus-visible { color: var(--color-ink); }
.masthead__nav a:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; }

/* Hero */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: var(--space-2xl);
  align-items: end;
  border-block-end: 1px solid var(--color-rule);
}

.hero__copy { max-width: 36rem; }

.hero__eyebrow {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 var(--space-md);
}

.hero__head {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0 0 var(--space-md);
  color: var(--color-ink);
}

.hero__head em { font-style: normal; color: var(--color-accent); }

.hero__sub {
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--color-ink-2);
  margin: 0 0 var(--space-lg);
  max-width: 56ch;
}

.hero__cta { display: flex; gap: var(--space-sm); flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5ch;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border: 1px solid var(--color-rule);
  background: transparent;
  color: var(--color-ink);
  cursor: pointer;
  line-height: 1;
  transition: background var(--dur-micro) var(--ease-out),
              border-color var(--dur-micro) var(--ease-out),
              color var(--dur-micro) var(--ease-out);
}

.btn--primary { background: var(--color-accent); color: var(--color-accent-ink); border-color: var(--color-accent); }
.btn--primary:hover, .btn--primary:focus-visible { background: var(--color-ink); border-color: var(--color-ink); }
.btn:hover, .btn:focus-visible { border-color: var(--color-accent); color: var(--color-accent); }
.btn:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; }

/* Hero panel — sample trace */
.hero__panel {
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: 4px;
  padding: var(--space-md);
  font-family: var(--font-display);
  font-size: 0.75rem;
}

.hero__panel-head {
  display: flex; justify-content: space-between;
  border-block-end: 1px solid var(--color-rule);
  padding-block-end: var(--space-2xs);
  margin-block-end: var(--space-sm);
  color: var(--color-ink-2);
}

.trace { display: grid; gap: 4px; }
.span {
  display: grid;
  grid-template-columns: 14ch 1fr 6ch;
  gap: var(--space-2xs);
  align-items: center;
}
.span__label { color: var(--color-ink); white-space: nowrap; }
.span__bar {
  position: relative;
  height: 8px;
  background: var(--color-paper-3);
  border-radius: 1px;
  overflow: hidden;
}
.span__bar > i {
  position: absolute;
  inset-block: 0;
  inset-inline-start: 0;
  background: var(--color-accent);
  border-radius: 1px;
}
.span--err .span__bar > i { background: var(--color-error); }
.span--warn .span__bar > i { background: var(--color-warn); }
.span__time { font-variant-numeric: tabular-nums; color: var(--color-ink-2); text-align: end; }

/* Walkthrough */
.workbench {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: var(--space-2xl);
  padding: var(--space-3xl) 0;
}

.steps { display: grid; gap: var(--space-3xl); }

.step {
  border-inline-start: 2px solid var(--color-rule);
  padding-inline-start: var(--space-lg);
  position: relative;
}
.step::before {
  content: "";
  position: absolute;
  inset-inline-start: -2px;
  inset-block-start: 0;
  width: 2px;
  height: 0;
  background: var(--color-accent);
  transition: height var(--dur-short) var(--ease-out);
}
.step:hover::before, .step:focus-within::before { height: 100%; }

.step__num {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-block-end: var(--space-sm);
}

.step__head {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.1;
  margin: 0 0 var(--space-md);
  color: var(--color-ink);
}

.step__body {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-ink-2);
  max-width: 48ch;
}
.step__body strong { color: var(--color-ink); font-weight: 500; }

.pinned {
  position: sticky;
  top: var(--space-xl);
  height: fit-content;
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  border-radius: 4px;
  padding: var(--space-lg);
}

.pinned__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--color-ink-2);
  border-block-end: 1px solid var(--color-rule);
  padding-block-end: var(--space-sm);
  margin-block-end: var(--space-md);
}

.pinned__chip {
  font-family: var(--font-display);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  padding: 2px 6px;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: 2px;
}

.pinned__why {
  margin-block-start: var(--space-md);
  padding-block-start: var(--space-md);
  border-block-start: 1px solid var(--color-rule);
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--color-ink-2);
  line-height: 1.5;
}

.pinned__why strong { color: var(--color-error); font-weight: 500; }

.colophon {
  padding: var(--space-md) 0;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--color-ink-2);
  border-block-start: 1px solid var(--color-rule);
}

.colophon a { color: var(--color-ink-2); text-decoration: none; transition: color var(--dur-micro) var(--ease-out); }
.colophon a:hover, .colophon a:focus-visible { color: var(--color-accent); }
.colophon a:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 3px; }

@media (max-width: 56rem) {
  .hero { grid-template-columns: 1fr; }
  .workbench { grid-template-columns: 1fr; }
  .pinned { position: static; }
}

@media (prefers-reduced-motion: reduce) {
  .step::before { transition: none; }
}