/* ── Unified base controls ────────────────────────────────────
   Shared control language. Additive: components migrate to these
   classes in later phases. Class prefix `ui-` to avoid clashes. */

:root {
  --focus-ring: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent);
}

/* Buttons */
.ui-btn {
  font: inherit;
  font-weight: 600;
  font-size: 13px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 9px 16px;
  border: 0;
  border-radius: var(--radius-control);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              filter var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.ui-btn:active { transform: scale(0.97); }
.ui-btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }

.ui-btn--primary { background: var(--accent); color: var(--on-accent); }
.ui-btn--primary:hover { filter: brightness(1.08); }

.ui-btn--secondary {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.06);
}
.ui-btn--secondary:hover { background: var(--hover-bg); }

.ui-btn--danger { background: var(--color-danger); color: var(--on-danger); }

/* Toggle (checkbox-driven) */
.ui-toggle { position: relative; display: inline-block; width: 42px; height: 24px; }
.ui-toggle input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.ui-toggle .ui-toggle-track {
  position: absolute; inset: 0; border-radius: 99px;
  background: rgba(255,255,255,0.16);
  transition: background var(--dur-fast) var(--ease-out);
}
.ui-toggle .ui-toggle-track::after {
  content: ""; position: absolute; top: 2px; left: 2px;
  width: 20px; height: 20px; border-radius: 50%; background: #fff;
  transition: transform var(--dur-fast) var(--ease-out);
}
.ui-toggle input:checked + .ui-toggle-track { background: var(--accent); }
.ui-toggle input:checked + .ui-toggle-track::after { transform: translateX(18px); }
.ui-toggle input:focus-visible + .ui-toggle-track { box-shadow: var(--focus-ring); }

/* Range slider */
.ui-slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 6px; border-radius: 6px;
  background: rgba(255,255,255,0.14);
  cursor: pointer;
}
.ui-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; box-shadow: var(--shadow-sm);
  border: 2px solid var(--accent);
}
.ui-slider::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 2px solid var(--accent);
}
.ui-slider::-moz-range-track {
  height: 6px; border-radius: 6px;
  background: rgba(255,255,255,0.14); border: 0;
}
.ui-slider:focus-visible { outline: none; box-shadow: var(--focus-ring); }

/* Segmented control */
.ui-segmented { display: inline-flex; gap: 2px; padding: 3px; border-radius: var(--radius-control); background: rgba(255,255,255,0.06); }
.ui-segmented button {
  font: inherit; font-size: 12px; font-weight: 600;
  padding: 6px 12px; border: 0; border-radius: 8px;
  background: transparent; color: var(--muted-text); cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.ui-segmented button[aria-selected="true"],
.ui-segmented button.active {
  background: rgba(255,255,255,0.12);
  color: var(--text);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.08), 0 1px 2px rgba(0,0,0,0.25);
}
.ui-segmented button:focus-visible { outline: none; box-shadow: var(--focus-ring); }

/* Chip */
.ui-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px; border-radius: 999px;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.12);
  font-size: 11.5px; font-weight: 600; color: var(--text); cursor: pointer;
}
.ui-chip.active { background: rgba(var(--accent-rgb),0.14); border-color: rgba(var(--accent-rgb),0.4); color: var(--accent); }

/* Respect reduced motion for all base controls */
@media (prefers-reduced-motion: reduce) {
  .ui-btn, .ui-toggle .ui-toggle-track, .ui-toggle .ui-toggle-track::after,
  .ui-segmented button { transition: none; }
}