/**
 * 05-utilities.css
 * Utility patterns (layout helpers, text modifiers, responsive utilities)
 * Part of: Agentic Semantic Web
 */

@layer utilities {

/* ══════════════════════════════════════════════════════════════════════════
   Text utilities
   ══════════════════════════════════════════════════════════════════════════ */

[data-text~="mono"] {
  font-family: var(--font-mono);
}

[data-text~="dim"] {
  color: var(--text-3);
}

[data-text~="accent"] {
  color: var(--accent);
}

[data-text~="small"] {
  font-size: var(--text-xs);
}

/* Eyebrow — small monospace uppercase accent label above a heading */
[data-text~="eyebrow"] {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

/* ══════════════════════════════════════════════════════════════════════════
   Layout utilities
   ══════════════════════════════════════════════════════════════════════════ */

/* Max-width content column — constrains fluid sections to readable width */
[data-wrap] {
  max-width: var(--width-content);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

/* Grid layout with responsive stacking */
[data-layout="grid-2"] {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (--md-n-below) {
  [data-layout="grid-2"] {
    grid-template-columns: 1fr;
  }
}

/* Card grid — responsive wrap for article cards */
[data-layout="card-grid"] {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

[data-layout="card-grid"] > * {
  flex: 1 1 calc(50% - 0.75rem);
  min-width: var(--size-px-13);
}

@media (--md-n-below) {
  [data-layout="card-grid"] > * {
    flex-basis: 100%;
  }
}

/* Stats bar — horizontal row of key-value metrics */
[data-layout="stats"] {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

[data-layout="stats"] > * {
  flex: 1 1 0;
  min-width: 5rem;
  padding: 0.75rem 0;
  text-align: center;
  border-right: 1px solid var(--border-subtle);
}

[data-layout="stats"] > *:last-child {
  border-right: none;
}

[data-layout="stats"] .value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.2;
}

[data-layout="stats"] .label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-top: 0.2rem;
}

@media (--sm-n-below) {
  [data-layout="stats"] > * {
    flex-basis: 33%;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }
}

/* Inline definition lists */
dl[data-layout="inline"] {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.15rem 1rem;
  align-items: baseline;
}

dl[data-layout="inline"] dt,
dl[data-layout="inline"] dd {
  margin: 0;
  padding: 0;
  margin-inline-start: 0;
}

/* ══════════════════════════════════════════════════════════════════════════
   Responsive visibility
   ══════════════════════════════════════════════════════════════════════════ */

/* Hide on mobile */
[data-visible="desktop"] {
  display: none;
}

@media (--md-n-above) {
  [data-visible="desktop"] {
    display: initial;
  }
}

/* Hide on desktop */
[data-visible="mobile"] {
  display: initial;
}

@media (--md-n-above) {
  [data-visible="mobile"] {
    display: none;
  }
}

/* ══════════════════════════════════════════════════════════════════════════
   Loading indicator — aria-busy
   Usage: <button aria-busy="true">Loading…</button>
          <section aria-busy="true">Content loading…</section>
   ══════════════════════════════════════════════════════════════════════════ */

@keyframes spin {
  to { transform: rotate(360deg); }
}

[aria-busy="true"] {
  cursor: progress;
}

/* Inline spinner before text in buttons and interactive elements */
:is(button, [role="button"], a)[aria-busy="true"]::before {
  content: "";
  display: inline-block;
  width: 1em;
  height: 1em;
  margin-right: 0.5em;
  vertical-align: -0.125em;
  border: var(--border-size-2) solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
}

/* Disable interaction on busy buttons */
:is(button, [role="button"])[aria-busy="true"] {
  pointer-events: none;
  opacity: 0.7;
}

/* Block-level busy: overlay spinner centered */
:is(section, article, main, div)[aria-busy="true"] {
  position: relative;
  min-height: 3rem;
}

:is(section, article, main, div)[aria-busy="true"]::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1.5rem;
  height: 1.5rem;
  margin: -0.75rem 0 0 -0.75rem;
  border: 2px solid var(--text-3);
  border-top-color: transparent;
  border-radius: 50%;
}

/* Spinner rotation — guarded: skip for users who prefer reduced motion */
@media (--motionOK) {
  :is(button, [role="button"], a)[aria-busy="true"]::before {
    animation: spin var(--spinner-duration) linear infinite;
  }

  :is(section, article, main, div)[aria-busy="true"]::after {
    animation: spin var(--spinner-duration) linear infinite;
  }
}

/* ══════════════════════════════════════════════════════════════════════════
   Accessibility enhancements
   ══════════════════════════════════════════════════════════════════════════ */

/* Disable all transitions and animations for reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Increase contrast for high-contrast preference */
@media (prefers-contrast: more) {
  :root {
    --border-color: var(--gray-10);
    --border-color-subtle: var(--gray-12);
    --text-primary: var(--gray-0);
    --text-secondary: var(--gray-3);
    --border-width: var(--border-size-2);
  }
  
  /* Thicker borders on interactive elements */
  a,
  button,
  input,
  select,
  textarea,
  [data-wikilink] {
    border-width: var(--border-size-2);
  }
  
  /* Stronger focus indicators */
  :focus-visible {
    outline-width: var(--border-size-3);
    outline-offset: var(--border-size-3);
  }
}

} /* end @layer utilities */