/* Shared UI components: buttons, chips, badges, cards, tap feedback, back link.
   Colours, radii and shadows come from tokens.css. Safe to load next to shell.css:
   .btn here uses the same base look as the one in shell.css. */

/* Tap feedback: press scale on any control or linked card. */
.tap,
.btn,
.chip {
  -webkit-tap-highlight-color: transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease,
    box-shadow 0.15s ease, transform 0.12s ease, opacity 0.15s ease;
}

.tap:active,
.btn:active:not(:disabled),
.chip:active:not(:disabled) {
  transform: scale(0.97);
}

/* Buttons: a link or button that should read as a button. 44px tap target. */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  min-height: var(--tap);
  padding: 0.5em 1.1em;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 700;
  line-height: 1.25;
  color: var(--fg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
}

.btn:hover {
  background: var(--subtle);
  color: var(--fg);
  text-decoration: none;
  box-shadow: var(--shadow-card);
}

.btn:focus-visible,
.chip:focus-visible,
.card:focus-visible,
.back-link:focus-visible,
.tap:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: default;
  pointer-events: none;
}

.btn svg {
  flex: none;
}

/* Primary: foreground on background, inverted. */
.btn--primary {
  color: var(--bg);
  background: var(--fg);
  border-color: var(--fg);
}

.btn--primary:hover {
  color: var(--bg);
  background: var(--fg);
  opacity: 0.88;
}

/* Outline: transparent fill, visible border. */
.btn--outline {
  background: transparent;
  border-color: var(--fg);
}

.btn--outline:hover {
  background: var(--subtle);
  box-shadow: none;
}

/* Ghost: no fill or border until hovered. */
.btn--ghost {
  color: var(--muted);
  background: none;
  border-color: transparent;
}

.btn--ghost:hover {
  color: var(--fg);
  box-shadow: none;
}

/* Small: keeps the 44px tap height on touch screens. */
.btn--sm {
  padding: 0.3em 0.8em;
  font-size: var(--text-xs);
}

@media (pointer: fine) {
  .btn--sm {
    min-height: 2.25rem;
  }
}

/* Icon only: square 44px target. */
.btn--icon {
  width: var(--tap);
  padding: 0;
}

.btn--pill {
  border-radius: 9999px;
}

/* Chip: filter pill. Add .is-active (or aria-pressed="true") for the selected state.
   The default display sits in :where() so a utility such as Tailwind hidden wins. */
:where(.chip) {
  display: inline-flex;
}

.chip {
  align-items: center;
  gap: 0.4em;
  min-height: var(--tap);
  padding: 0.3em 0.9em;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 700;
  line-height: 1.25;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9999px;
  cursor: pointer;
}

.chip:hover {
  color: var(--fg);
  background: var(--subtle);
}

.chip.is-active,
.chip[aria-pressed="true"] {
  color: var(--bg);
  background: var(--fg);
  border-color: var(--fg);
}

/* Count shown inside a chip. */
.chip__count {
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  opacity: 0.7;
}

/* Badge: soft pill tinted from its own text colour. Tones set the colour. */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  padding: 0.15em 0.65em;
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 700;
  line-height: 1.4;
  white-space: nowrap;
  color: var(--muted);
  background: color-mix(in srgb, currentColor 13%, transparent);
  border-radius: 9999px;
}

.badge--accent { color: var(--accent); }
.badge--warn { color: var(--warn); }
.badge--muted { color: var(--muted); }
.badge--fg { color: var(--fg); }

/* Card: raised surface. Use on a link (a.card) for the hover lift.
   The default display sits in :where() so a utility such as Tailwind flex on the same
   element wins whatever the stylesheet order. */
:where(.card) {
  display: block;
}

.card {
  padding: var(--space-5);
  color: var(--fg);
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  text-decoration: none;
}

a.card,
button.card {
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}

a.card:hover,
button.card:hover {
  box-shadow: var(--shadow-lift);
  transform: translateY(-1px);
}

a.card:active,
button.card:active {
  transform: scale(0.98);
}

/* Back link: small muted link with an arrow, above a page title. */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  min-height: var(--tap);
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--muted);
  text-decoration: none;
}

.back-link:hover {
  color: var(--fg);
}

@media (prefers-reduced-motion: reduce) {
  .tap,
  .btn,
  .chip,
  a.card,
  button.card {
    transition: none;
  }

  .tap:active,
  .btn:active:not(:disabled),
  .chip:active:not(:disabled),
  a.card:active,
  button.card:active,
  a.card:hover,
  button.card:hover {
    transform: none;
  }
}

@media print {
  .btn,
  .chip,
  .back-link {
    display: none;
  }

  .card {
    box-shadow: none;
    border-color: #999999;
  }
}