/* Site layout. Colour, type, spacing and radii come from design system tokens only. */

html { scroll-padding-top: calc(var(--header-height) + var(--space-4)); }

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--surface-card);
}

main {
  flex: 1;
  width: 100%;
  padding: var(--space-8) var(--space-4) var(--space-12);
}

img { max-width: 100%; height: auto; }

[hidden] { display: none !important; }

:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 20;
  padding: var(--space-2) var(--space-4);
  background: var(--brand-navy);
  color: var(--text-on-brand);
  border-radius: var(--radius-sm);
}
.skip-link:focus { top: var(--space-2); color: var(--text-on-brand); }

/* ---- Header ------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header-height);
  background: var(--brand-navy);
  color: var(--text-on-brand);
}
.site-header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}
.site-brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  flex: none;
  font-size: var(--text-lg);
  color: var(--text-on-brand);
}
.site-brand:hover { color: var(--text-on-brand); }
.site-header .ef-wordmark { color: var(--text-on-brand); }
.site-brand-sub {
  font-size: 14px;
  font-weight: var(--fw-medium);
  text-transform: uppercase;
  letter-spacing: var(--tracking-tagline);
}
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex: 1;
  min-width: 0;
  justify-content: flex-end;
  overflow-x: auto;
  white-space: nowrap;
  font-size: 14px;
  font-weight: var(--fw-medium);
}
.site-nav a { color: var(--text-on-brand); padding: var(--space-2) 0; }
.site-nav a:hover { color: var(--text-on-brand); text-decoration: underline; }
.site-header :focus-visible { outline-color: var(--brand-gold); }

.theme-toggle {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  color: var(--text-on-brand);
  background: transparent;
  border: 1px solid var(--text-on-brand);
  border-radius: var(--radius-pill);
  cursor: pointer;
}
.theme-toggle-glyph {
  width: 14px;
  height: 14px;
  border-radius: var(--radius-pill);
  background: currentColor;
}
[data-theme="dark"] .theme-toggle-glyph {
  background: transparent;
  border: 2px solid currentColor;
}

/* ---- Footer ------------------------------------------------------------- */
.site-footer {
  background: var(--surface-card);
  border-top: 1px solid var(--border-default);
  padding: var(--space-6) var(--space-4);
}
.site-footer-inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  max-width: var(--container-max);
  margin: 0 auto;
}
.site-footer p { margin: 0; font-size: 14px; color: var(--text-secondary); }
.site-footer img { height: 28px; width: auto; }
.logo-dark { display: none; }
[data-theme="dark"] .logo-light { display: none; }
[data-theme="dark"] .logo-dark { display: inline; }

/* ---- Containers and grids ---------------------------------------------- */
.container-content { max-width: var(--container-content); margin: 0 auto; }
.container-max { max-width: var(--container-max); margin: 0 auto; }

.prose {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--text-body);
}

.grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.stack > * + * { margin-top: var(--space-4); }

/* ---- Tab strip ---------------------------------------------------------- */
.tabs {
  display: flex;
  gap: var(--space-1);
  overflow-x: auto;
  border-bottom: 1px solid var(--border-default);
}
.tab {
  flex: none;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: var(--fw-medium);
  color: var(--text-secondary);
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  cursor: pointer;
}
.tab:hover { color: var(--text-primary); }
.tab[aria-selected="true"] {
  color: var(--text-primary);
  border-bottom-color: var(--brand-gold);
}
.tab-panel { padding-top: var(--space-5); }
.tab-panel[hidden] { display: none; }

/* ---- Steps -------------------------------------------------------------- */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}
.steps > li {
  position: relative;
  counter-increment: step;
  padding: 0 0 var(--space-5) calc(var(--space-10) + var(--space-2));
}
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--space-8);
  height: var(--space-8);
  font-weight: var(--fw-semibold);
  color: var(--text-on-brand);
  background: var(--brand-navy);
  border-radius: var(--radius-pill);
}
.steps pre {
  margin: var(--space-2) 0 0;
  padding: var(--space-3) var(--space-4);
  overflow-x: auto;
  color: var(--text-body);
  background: var(--surface-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
}

/* ---- Board picker ------------------------------------------------------- */
.board-picker {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 200px), 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
}
.board-picker a { text-decoration: none; }
.board-name { margin: 0 0 var(--space-2); font-size: var(--text-lg); color: var(--text-primary); }
.board-meta { margin: 0; font-size: 14px; color: var(--text-secondary); }
.mono { font-family: var(--font-mono); }

/* ---- Pages -------------------------------------------------------------- */
h1 { margin: 0 0 var(--space-4); }
.hero { padding-bottom: var(--space-6); }
.page-section { margin-top: var(--space-10); }
.page-section > h2 { margin: 0 0 var(--space-5); }
.actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin: var(--space-4) 0 0; }
.chips { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: var(--space-3) 0 0; }
.note { margin: var(--space-3) 0 0; color: var(--text-secondary); }
.card-feature { border-color: var(--brand-navy); border-width: 2px; }
.card .board-name, .card .board-meta { display: block; }
.board-picker .card { height: 100%; }
.board-picker .badge { margin-top: var(--space-3); }

.cmd {
  margin: var(--space-3) 0 0;
  padding: var(--space-4);
  overflow-x: auto;
  color: var(--text-body);
  background: var(--surface-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
}
.js .panel-title { display: none; }
.install-tabs .tab-panel + .tab-panel { margin-top: var(--space-5); }
.js .install-tabs .tab-panel + .tab-panel { margin-top: 0; }

.board-panels { margin-top: var(--space-6); }
.board-panel + .board-panel { margin-top: var(--space-5); }
.board-panel .board-name { font-size: var(--text-h3); }
.board-section { margin-top: var(--space-5); }
.board-section > h4 { margin: 0 0 var(--space-3); }
.board-section p { margin: var(--space-2) 0 0; }
.checksum code { overflow-wrap: anywhere; }
.values {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: var(--space-2) var(--space-4);
  margin: var(--space-3) 0 0;
}
.values dt, .values dd { margin: 0; overflow-wrap: anywhere; }
.values dt { color: var(--text-secondary); }
.js .board-picker a[aria-current="true"] { border-color: var(--brand-navy); }

.scarf-pixel { position: absolute; width: 1px; height: 1px; border: 0; opacity: 0; pointer-events: none; }

@media (max-width: 560px) {
  .site-header-inner { gap: var(--space-3); }
  .site-nav { gap: var(--space-3); justify-content: flex-start; font-size: 13px; }
  .site-brand-sub { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}