/*
 * Thin semantic layer for Open Control Engine documentation.
 *
 * These neutral custom properties are the only design-value seam. A later,
 * separately licensed design-token pass can replace values without changing
 * the page structure or overriding mdBook's built-in theme files.
 */
:root {
  --oce-font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --oce-font-mono: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --oce-content-width: 72rem;
  --oce-reading-width: 52rem;
  --oce-space-1: 0.35rem;
  --oce-space-2: 0.75rem;
  --oce-space-3: 1.25rem;
  --oce-space-4: 2rem;
  --oce-space-5: 3.5rem;
  --oce-radius: 0.35rem;
  --oce-border-width: 1px;
  --oce-accent: #35635a;
  --oce-accent-strong: #244b44;
  --oce-accent-contrast: #ffffff;
  --oce-surface: rgba(127, 127, 127, 0.07);
  --oce-border: rgba(80, 80, 80, 0.3);
  --oce-focus: #2d6f9f;
}

html.coal,
html.navy,
html.ayu {
  --oce-accent: #8fc6b8;
  --oce-accent-strong: #b6ded4;
  --oce-accent-contrast: #10201c;
  --oce-surface: rgba(255, 255, 255, 0.06);
  --oce-border: rgba(255, 255, 255, 0.22);
  --oce-focus: #8fc8ee;
}

.content main {
  max-width: var(--oce-reading-width);
}

.content main:has(.oce-landing) {
  max-width: var(--oce-content-width);
}

.oce-landing {
  font-family: var(--oce-font-sans);
  padding-bottom: var(--oce-space-5);
}

.oce-hero {
  border-bottom: var(--oce-border-width) solid var(--oce-border);
  padding: var(--oce-space-4) 0 var(--oce-space-5);
}

.oce-eyebrow,
.oce-card-label {
  color: var(--oce-accent-strong);
  font-family: var(--oce-font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  margin: 0 0 var(--oce-space-2);
}

.oce-hero h1 {
  font-size: clamp(2.4rem, 7vw, 5.2rem);
  letter-spacing: -0.045em;
  line-height: 0.98;
  margin: 0;
  max-width: 12ch;
}

.oce-lede {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.55;
  margin: var(--oce-space-3) 0 0;
  max-width: 48rem;
}

.oce-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--oce-space-2);
  margin-top: var(--oce-space-4);
}

.oce-action {
  border: var(--oce-border-width) solid var(--oce-border);
  border-radius: var(--oce-radius);
  display: inline-block;
  font-weight: 700;
  padding: 0.7rem 1rem;
  text-decoration: none;
}

.oce-action-primary {
  background: var(--oce-accent);
  border-color: var(--oce-accent);
  color: var(--oce-accent-contrast) !important;
}

.oce-action:hover,
.oce-card a:hover,
.oce-evidence a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.oce-action:focus-visible,
.oce-card a:focus-visible,
.oce-evidence a:focus-visible {
  outline: 3px solid var(--oce-focus);
  outline-offset: 3px;
}

.oce-paths,
.oce-evidence {
  padding-top: var(--oce-space-5);
}

.oce-card-grid {
  display: grid;
  gap: var(--oce-space-3);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.oce-card {
  background: var(--oce-surface);
  border: var(--oce-border-width) solid var(--oce-border);
  border-radius: var(--oce-radius);
  padding: var(--oce-space-4);
}

.oce-card h3 {
  margin-top: 0;
}

.oce-card a,
.oce-evidence a {
  color: var(--oce-accent-strong);
  font-weight: 700;
}

.oce-evidence {
  max-width: 48rem;
}

@media (max-width: 48rem) {
  .oce-card-grid {
    grid-template-columns: 1fr;
  }

  .oce-hero {
    padding-top: var(--oce-space-3);
  }
}