/* ═══════════════════════════════════════════════════════════════════
   AURALIS · BottomSheet framework (Task T)
   ───────────────────────────────────────────────────────────────────
   Reusable slide-up bottom sheet: backdrop, grip, title, content,
   actions footer. Swipe-down close. Focus trap. Stack support.
   ═══════════════════════════════════════════════════════════════════ */

.bs-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  background: rgba(8, 9, 13, 0.55);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity 0.25s var(--ease);
  pointer-events: none;
}
[data-theme="light"] .bs-overlay,
:root:not([data-theme]) .bs-overlay {
  background: rgba(60, 70, 100, 0.35);
}
.bs-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}
.bs-overlay.is-closing {
  opacity: 0;
  pointer-events: none;
}

.bs-sheet {
  width: 100%;
  max-width: 480px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  border-top-left-radius: var(--radius);
  border-top-right-radius: var(--radius);
  overflow: hidden;
  padding-bottom: env(safe-area-inset-bottom, 0);
  transform: translateY(100%);
  transition: transform 0.32s var(--ease-spring);
}
.bs-overlay.is-open .bs-sheet {
  transform: translateY(0);
}
.bs-overlay.is-closing .bs-sheet {
  transform: translateY(100%);
  transition-duration: 0.2s;
}

[data-theme="light"] .bs-sheet,
:root:not([data-theme]) .bs-sheet {
  background: var(--bg-main);
  box-shadow: 0 -16px 40px rgba(60, 70, 100, 0.35);
}
[data-theme="dark"] .bs-sheet {
  background: linear-gradient(180deg, hsl(220 25% 7%) 0%, hsl(220 25% 5%) 100%);
  border-top: 1px solid var(--border-color);
}

/* ═══ GRIP ═══ */
.bs-grip {
  width: 40px;
  height: 4px;
  background: var(--text-faint);
  border-radius: 999px;
  margin: 10px auto 0;
  opacity: 0.5;
  cursor: grab;
}

/* ═══ HEADER ═══ */
.bs-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px 8px;
  flex-shrink: 0;
}
.bs-title {
  flex: 1;
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  margin: 0;
}
.bs-close {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border: none;
  border-radius: var(--radius-icon);
  display: grid;
  place-items: center;
  color: var(--text-muted);
  cursor: pointer;
  background: transparent;
  transition: background var(--dur) var(--ease);
}
[data-theme="light"] .bs-close,
:root:not([data-theme]) .bs-close {
  background: var(--surface);
  box-shadow: var(--shadow-card-sm);
}
[data-theme="dark"] .bs-close {
  background: hsl(220 25% 8% / 0.7);
}
.bs-close:hover,
.bs-close:focus-visible {
  color: var(--text);
  outline: none;
}
.bs-close svg { width: 18px; height: 18px; }

/* ═══ CONTENT ═══ */
.bs-content {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 8px 16px 16px;
}

/* ═══ FOOTER (actions) ═══ */
.bs-footer {
  flex-shrink: 0;
  padding: 8px 16px 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
[data-theme="light"] .bs-footer,
:root:not([data-theme]) .bs-footer {
  border-top-color: hsl(220 18% 88%);
}
[data-theme="dark"] .bs-footer {
  border-top-color: hsl(220 20% 14%);
}

.bs-action {
  width: 100%;
  min-height: 48px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease);
}
.bs-action:active { transform: scale(0.98); }

.bs-action--primary {
  background: linear-gradient(135deg, hsl(var(--hue1) 70% 55%), hsl(var(--hue2) 65% 55%));
  color: white;
  box-shadow: 0 6px 18px hsl(var(--hue1) 60% 45% / 0.4),
    inset 0 1px 0 hsl(0 0% 100% / 0.2);
}
.bs-action--secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-color);
}
[data-theme="light"] .bs-action--secondary,
:root:not([data-theme]) .bs-action--secondary {
  background: var(--surface);
  box-shadow: var(--shadow-card-sm);
}
.bs-action--danger {
  background: linear-gradient(135deg, hsl(355 75% 50%), hsl(345 70% 45%));
  color: white;
}

@media (prefers-reduced-motion: reduce) {
  .bs-overlay { transition: none; }
  .bs-sheet { transition: none; }
}