/*
 * 806ai.ai — UI Primitives (Slice 0: Foundation & Baseline)
 * ───────────────────────────────────────────────────────────
 * Opt-in component classes for Slice 1+, namespaced `.ui-*` so nothing
 * here collides with (or is picked up by) existing production classes
 * like `.btn`, `.card`, `.item`, `.chip`. Production's own components
 * are untouched — this is a second, deliberately separate system that
 * future slices adopt page by page, not a replacement forced on today's
 * markup.
 *
 * Every interactive primitive defines default / hover / focus-visible /
 * active / disabled where applicable, and respects the global
 * prefers-reduced-motion rule already set in index.html. Minimum
 * interactive target size is 44×44px per the Slice 0 spec.
 *
 * Depends on styles/tokens.css, styles/typography.css and styles/motion.css
 * being loaded first.
 */

/* ══════════ Button ══════════ */
.ui-btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2, 8px);
  min-height: 44px;
  padding: 0 var(--space-6, 24px);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-foreground);
  font-family: var(--font-sans);
  font-size: var(--text-body-small);
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: background var(--duration-micro) var(--ease-standard),
              border-color var(--duration-micro) var(--ease-standard),
              transform var(--duration-micro) var(--ease-standard),
              box-shadow var(--duration-micro) var(--ease-standard);
}
.ui-btn:hover{ border-color: var(--color-primary); }
.ui-btn:focus-visible{ outline: 2px solid var(--color-primary); outline-offset: 2px; }
.ui-btn:active{ transform: scale(.97); }
.ui-btn:disabled,
.ui-btn[aria-disabled="true"]{ opacity: .5; cursor: not-allowed; transform: none; }

.ui-btn--primary{
  background: linear-gradient(180deg, var(--color-accent), var(--color-primary));
  color: var(--color-primary-foreground);
  border-color: transparent;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.28);
}
.ui-btn--primary:hover{ filter: brightness(1.05); }

.ui-btn--ghost{
  background: none;
  border-color: transparent;
  color: var(--color-primary);
}
.ui-btn--ghost:hover{ background: var(--color-surface-subtle); }

.ui-btn--sm{ min-height: 36px; padding: 0 var(--space-4, 16px); font-size: var(--text-caption); }

/* ══════════ IconButton ══════════ */
.ui-icon-btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-foreground);
  cursor: pointer;
  transition: background var(--duration-micro) var(--ease-standard),
              border-color var(--duration-micro) var(--ease-standard),
              transform var(--duration-micro) var(--ease-standard);
}
.ui-icon-btn svg{ width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 1.8; }
.ui-icon-btn:hover{ border-color: var(--color-primary); color: var(--color-primary); }
.ui-icon-btn:focus-visible{ outline: 2px solid var(--color-primary); outline-offset: 2px; }
.ui-icon-btn:active{ transform: scale(.94); }
.ui-icon-btn:disabled{ opacity: .5; cursor: not-allowed; }

/* ══════════ Link ══════════ */
.ui-link{
  color: var(--color-primary);
  text-underline-offset: 3px;
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color var(--duration-micro) var(--ease-standard);
}
.ui-link:hover{ text-decoration-color: currentColor; }
.ui-link:focus-visible{ outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }

/* ══════════ Card ══════════ */
.ui-card{
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6, 24px);
  box-shadow: var(--shadow-md);
}
.ui-card--interactive{
  cursor: pointer;
  transition: transform var(--duration-micro) var(--ease-spring),
              border-color var(--duration-micro) var(--ease-standard),
              box-shadow var(--duration-micro) var(--ease-standard);
}
.ui-card--interactive:hover{ transform: translateY(-2px); border-color: var(--color-primary); }
.ui-card--interactive:focus-visible{ outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* ══════════ Badge ══════════ */
.ui-badge{
  display: inline-flex;
  align-items: center;
  gap: var(--space-1, 4px);
  padding: 2px var(--space-3, 12px);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  background: var(--color-surface-subtle);
  color: var(--color-muted-foreground);
  border: 1px solid var(--color-border);
}
.ui-badge--primary     { background: color-mix(in srgb, var(--color-primary) 12%, transparent);     color: var(--color-primary);     border-color: color-mix(in srgb, var(--color-primary) 35%, transparent); }
.ui-badge--success     { background: color-mix(in srgb, var(--color-success) 12%, transparent);     color: var(--color-success);     border-color: color-mix(in srgb, var(--color-success) 35%, transparent); }
.ui-badge--warning     { background: color-mix(in srgb, var(--color-warning) 12%, transparent);     color: var(--color-warning);     border-color: color-mix(in srgb, var(--color-warning) 35%, transparent); }
.ui-badge--destructive { background: color-mix(in srgb, var(--color-destructive) 12%, transparent); color: var(--color-destructive); border-color: color-mix(in srgb, var(--color-destructive) 35%, transparent); }
.ui-badge--info        { background: color-mix(in srgb, var(--color-info) 12%, transparent);        color: var(--color-info);        border-color: color-mix(in srgb, var(--color-info) 35%, transparent); }

/* ══════════ Form controls: Input / Textarea / Select ══════════ */
.ui-input, .ui-textarea, .ui-select{
  display: block;
  width: 100%;
  min-height: 44px;
  padding: 0 var(--space-4, 16px);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-foreground);
  font-family: var(--font-sans);
  font-size: var(--text-body-small);
  transition: border-color var(--duration-micro) var(--ease-standard),
              box-shadow var(--duration-micro) var(--ease-standard);
}
.ui-textarea{ min-height: 88px; padding-block: var(--space-3, 12px); resize: vertical; }
.ui-input:hover, .ui-textarea:hover, .ui-select:hover{ border-color: var(--color-border-strong); }
.ui-input:focus-visible, .ui-textarea:focus-visible, .ui-select:focus-visible{
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 20%, transparent);
}
.ui-input:disabled, .ui-textarea:disabled, .ui-select:disabled{
  opacity: .5; cursor: not-allowed; background: var(--color-surface-subtle);
}
.ui-input[aria-invalid="true"], .ui-textarea[aria-invalid="true"]{
  border-color: var(--color-destructive);
}
.ui-field-error{
  display: flex; align-items: center; gap: var(--space-1, 4px);
  color: var(--color-destructive);
  font-size: var(--text-caption);
  margin-top: var(--space-2, 8px);
}

/* ══════════ Checkbox ══════════ */
.ui-checkbox{
  display: inline-flex;
  align-items: center;
  gap: var(--space-3, 12px);
  min-height: 44px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: var(--text-body-small);
  color: var(--color-foreground);
}
.ui-checkbox input[type="checkbox"]{
  width: 20px; height: 20px;
  accent-color: var(--color-primary);
  cursor: pointer;
}
.ui-checkbox input[type="checkbox"]:focus-visible{ outline: 2px solid var(--color-primary); outline-offset: 2px; }
.ui-checkbox:has(input:disabled){ opacity: .5; cursor: not-allowed; }

/* ══════════ Divider ══════════ */
.ui-divider{
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: var(--space-6, 24px) 0;
}
.ui-divider--vertical{
  border-top: 0;
  border-left: 1px solid var(--color-border);
  width: 0;
  align-self: stretch;
  margin: 0 var(--space-4, 16px);
}

/* ══════════ Skeleton ══════════ */
.ui-skeleton{
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: linear-gradient(100deg, var(--color-border) 30%, var(--color-surface-subtle) 50%, var(--color-border) 70%);
  background-size: 200% 100%;
  animation: ui-shimmer 1.8s ease-in-out infinite;
}
@keyframes ui-shimmer{ 0%{ background-position: -200% 0; } 100%{ background-position: 200% 0; } }
@media (prefers-reduced-motion: reduce){
  .ui-skeleton{ animation: none; background: var(--color-surface-subtle); }
}

/* ══════════ Empty / Error / Loading states ══════════ */
.ui-empty-state, .ui-error-state, .ui-loading-state{
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-3, 12px);
  padding: var(--space-12, 48px) var(--space-6, 24px);
  color: var(--color-muted-foreground);
}
.ui-empty-state__icon, .ui-error-state__icon{
  width: 40px; height: 40px;
  color: var(--color-faint-foreground);
}
.ui-empty-state__title, .ui-error-state__title{
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: var(--text-heading-sm);
  color: var(--color-foreground);
}
.ui-empty-state__desc, .ui-error-state__desc{
  font-size: var(--text-body-small);
  max-width: 42ch;
}
.ui-error-state__icon{ color: var(--color-destructive); }
.ui-loading-state{ flex-direction: row; gap: var(--space-3, 12px); padding: var(--space-8, 32px); }
.ui-loading-state__spinner{
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  animation: ui-spin .7s linear infinite;
  flex-shrink: 0;
}
@keyframes ui-spin{ to{ transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce){
  .ui-loading-state__spinner{ animation: ui-spin 1.6s linear infinite; }
}

/* ══════════ Tabs ══════════ */
.ui-tabs{ display: flex; flex-direction: column; gap: var(--space-4, 16px); }
.ui-tablist{
  display: flex;
  gap: var(--space-1, 4px);
  border-bottom: 1px solid var(--color-border);
}
.ui-tab{
  min-height: 44px;
  padding: 0 var(--space-4, 16px);
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--color-muted-foreground);
  font-family: var(--font-mono);
  font-size: var(--text-label);
  letter-spacing: .06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--duration-micro) var(--ease-standard), border-color var(--duration-micro) var(--ease-standard);
}
.ui-tab:hover{ color: var(--color-foreground); }
.ui-tab:focus-visible{ outline: 2px solid var(--color-primary); outline-offset: -2px; }
.ui-tab[aria-selected="true"]{ color: var(--color-foreground); border-color: var(--color-primary); }
.ui-tabpanel{ outline: none; }
.ui-tabpanel:focus-visible{ outline: 2px solid var(--color-primary); outline-offset: 2px; }
.ui-tabpanel[hidden]{ display: none; }

/* ══════════ Accordion (built on native <details>/<summary>) ══════════ */
.ui-accordion{ border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden; background: var(--color-surface); }
.ui-accordion + .ui-accordion{ margin-top: var(--space-2, 8px); }
.ui-accordion > summary{
  min-height: 44px;
  padding: var(--space-4, 16px) var(--space-5, 20px);
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4, 16px);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--color-foreground);
}
.ui-accordion > summary::-webkit-details-marker{ display: none; }
.ui-accordion > summary:focus-visible{ outline: 2px solid var(--color-primary); outline-offset: -2px; }
.ui-accordion > summary::after{
  content: "+";
  font-family: var(--font-mono);
  color: var(--color-primary);
  transition: transform var(--duration-micro) var(--ease-spring);
}
.ui-accordion[open] > summary::after{ transform: rotate(45deg); }
.ui-accordion__body{ padding: 0 var(--space-5, 20px) var(--space-5, 20px); color: var(--color-muted-foreground); font-size: var(--text-body-small); }

/* ══════════ Dialog & Sheet (built on native <dialog>) ══════════
   Native <dialog>.showModal() gives us focus trapping, Escape-to-close
   and top-layer stacking for free — see js/ui-primitives.js for the
   open/close wiring. */
dialog.ui-dialog{
  border: 0;
  border-radius: var(--radius-lg);
  padding: var(--space-8, 32px);
  max-width: min(90vw, 480px);
  width: 100%;
  background: var(--color-surface);
  color: var(--color-foreground);
  box-shadow: var(--shadow-elevated);
}
dialog.ui-dialog::backdrop{ background: rgba(0,0,0,.55); backdrop-filter: blur(4px); }
dialog.ui-dialog[open]{ animation: ui-dialog-in var(--duration-normal) var(--ease-spring) both; }
@keyframes ui-dialog-in{ from{ opacity: 0; transform: scale(.97) translateY(8px); } to{ opacity: 1; transform: none; } }
.ui-dialog__title{ font-family: var(--font-sans); font-weight: 700; font-size: var(--text-heading-md); margin-bottom: var(--space-3, 12px); }
.ui-dialog__body{ font-size: var(--text-body-small); color: var(--color-muted-foreground); margin-bottom: var(--space-6, 24px); }
.ui-dialog__actions{ display: flex; justify-content: flex-end; gap: var(--space-3, 12px); }

dialog.ui-sheet{
  border: 0;
  margin: auto auto 0 auto;
  width: 100%;
  max-width: 560px;
  max-height: 85vh;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: var(--space-3, 12px) var(--space-5, 20px) calc(var(--space-6, 24px) + env(safe-area-inset-bottom));
  background: var(--color-surface);
  color: var(--color-foreground);
  box-shadow: var(--shadow-elevated);
}
dialog.ui-sheet::backdrop{ background: rgba(0,0,0,.55); backdrop-filter: blur(4px); }
dialog.ui-sheet[open]{ animation: ui-sheet-in var(--duration-transform) var(--ease-spring) both; }
@keyframes ui-sheet-in{ from{ opacity: 0; transform: translateY(48px); } to{ opacity: 1; transform: none; } }
.ui-sheet__grab{ width: 40px; height: 4px; border-radius: var(--radius-full); background: var(--color-border-strong); margin: 0 auto var(--space-3, 12px); }
@media (prefers-reduced-motion: reduce){
  dialog.ui-dialog[open], dialog.ui-sheet[open]{ animation: none; }
}

/* ══════════ Tooltip ══════════ */
[data-tooltip]{ position: relative; }
.ui-tooltip{
  position: absolute;
  z-index: var(--z-toast, 100);
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: var(--space-2, 8px) var(--space-3, 12px);
  border-radius: var(--radius-sm);
  background: var(--color-surface-inverse);
  color: var(--color-foreground-inverse);
  font-family: var(--font-sans);
  font-size: var(--text-caption);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--duration-micro) var(--ease-standard), transform var(--duration-micro) var(--ease-standard);
}
.ui-tooltip[data-open="true"]{ opacity: 1; transform: translateX(-50%) translateY(0); }