/* ============================================================================
   Shared Life OS UI primitives.

   Neutral, view-agnostic components used by BOTH the Life OS surfaces (todo,
   dashboard, ...) and the Bigtion AX work surfaces (work board, operator,
   outbox, proposal review). Built on the shared design tokens. A surface
   should consume these instead of reinventing its own look — that is what
   keeps every screen one product, not parallel imitations.

   Currently defined here:
   - .ui-tabs / .ui-tab   segmented view-tab control
   - .ui-empty            rich "this whole view is empty" state
   ========================================================================= */

/* ===== Generic button base ===== */
/* Thin reset: appearance / layout / cursor / focus-visible / disabled / transition.
   Sizing, shape, and color are NOT declared here — those belong to each surface's
   modifier class (e.g. .ax-button, .todo-add-btn) so pill shapes and rect shapes
   can coexist without fighting the base. */
.ui-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font: inherit;
  transition: background 150ms ease, border-color 150ms ease, color 150ms ease,
              box-shadow 150ms ease, opacity 150ms ease;
}

.ui-btn:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

.ui-btn:disabled,
.ui-btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
}

.ui-btn[aria-disabled="true"] {
  pointer-events: none;
}

/* ===== Generic panel container ===== */
/* Box contract: border, radius, background, shadow, min-width reset.
   Layout inside the panel (display, flex-direction, gap, overflow) belongs to each
   surface's modifier or child class.
   .ax-panel / .dash-card / .note-card use their own sizing & shadow variants;
   only elements whose box style is identical to this contract should add .ui-panel. */
.ui-panel {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-panel);
  box-shadow: var(--shadow);
}

.ui-panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 20px 0;
}

.ui-panel-body {
  min-width: 0;
  padding: 20px;
}

/* ===== Segmented view tabs ===== */
.ui-tabs {
  display: flex;
  gap: 3px;
  background: var(--surface-control-track);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 3px;
  overflow-x: auto;
  scrollbar-width: none;
}

.ui-tabs::-webkit-scrollbar {
  display: none;
}

.ui-tab {
  flex: 1;
  min-width: max-content;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 7px 12px;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  font-family: var(--font-family);
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.15s;
}

.ui-tab:hover {
  color: var(--text-secondary);
}

.ui-tab.active {
  background: var(--surface-control-selected);
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.ui-tab-label {
  display: inline;
}

.ui-tab-badge {
  font-size: 11px;
  font-weight: 700;
  background: var(--accent);
  color: white;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  min-width: 18px;
  text-align: center;
  line-height: 16px;
}

.ui-tab-badge:empty {
  display: none;
}

@media (max-width: 767px) {
  .ui-tab {
    padding: 6px 10px;
    font-size: 11px;
  }
}

/* ===== Field primitives ===== */
/* Box/layout contract for information fields.
   Surface semantic markers (.ax-field, .ax-field-grid, .ax-field-card in
   ax-work-surface.css) stay empty so only these rules fire — no redundant
   redeclarations. */
.ui-field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.ui-field {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-content: start;
  min-height: 76px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-panel-soft);
}

.ui-field-card {
  min-width: 0;
  display: grid;
  gap: 6px;
  align-content: start;
  min-height: 76px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-panel-soft);
}

@media (max-width: 1080px) {
  .ui-field-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ===== Rich empty state (whole view / whole list is empty) ===== */
.ui-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
}

.ui-empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
  color: var(--accent);
  opacity: 0.5;
}

.ui-empty-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.ui-empty-sub {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}