/* ==========================================================================
   Panel Base
   Shared slide-up drawer behavior for settings, lyrics, and about panels.
   Component files keep only their overrides.
   ========================================================================== */

.settings-drawer,
.lyrics-panel,
.about-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  flex-direction: column;
  background: var(--surface-glass);
  backdrop-filter: blur(var(--blur-medium));
  -webkit-backdrop-filter: blur(var(--blur-medium));
  border-top: 1px solid var(--color-border);
  padding: var(--space-4);
  transform: translateY(100%);
  transition: transform var(--duration-slow) var(--ease-in-out),
              visibility 0s var(--duration-slow);
  visibility: hidden;
}

/* Fallback for browsers without backdrop-filter */
@supports not (backdrop-filter: blur(1px)) {
  .settings-drawer,
  .lyrics-panel,
  .about-panel {
    background: var(--color-surface);
  }
}

/* Override hidden attribute to allow animation */
.settings-drawer[hidden],
.about-panel[hidden] {
  display: block !important;
}

.lyrics-panel[hidden] {
  display: flex !important;
}

.settings-drawer:not([hidden]),
.lyrics-panel:not([hidden]),
.about-panel:not([hidden]) {
  transform: translateY(0);
  visibility: visible;
  transition: transform var(--duration-slow) var(--ease-in-out),
              visibility 0s 0s;
}

/* --------------------------------------------------------------------------
   Drag Handle
   -------------------------------------------------------------------------- */

.settings-drawer__handle,
.about-panel__handle {
  width: 36px;
  height: 4px;
  background: var(--color-text-muted);
  border-radius: 2px;
  margin: 0 auto var(--space-3);
  opacity: 0.4;
  touch-action: none;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.settings-drawer__header,
.lyrics-panel__header,
.about-panel__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

/* Lyrics header doubles as swipe-dismiss handle */
.lyrics-panel__header {
  touch-action: none;
}

.settings-drawer__header,
.about-panel__header {
  margin-bottom: var(--space-4);
}

/* --------------------------------------------------------------------------
   Title
   -------------------------------------------------------------------------- */

.settings-drawer__title,
.lyrics-panel__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Close Button
   -------------------------------------------------------------------------- */

.settings-drawer__close,
.lyrics-panel__close,
.about-panel__close {
  width: var(--touch-target);
  height: var(--touch-target);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  margin-right: calc(-1 * var(--space-2));
  transition: color var(--duration-fast) var(--ease-out),
              background var(--duration-fast) var(--ease-out);
}

.settings-drawer__close:hover,
.settings-drawer__close:focus-visible,
.lyrics-panel__close:hover,
.lyrics-panel__close:focus-visible,
.about-panel__close:hover,
.about-panel__close:focus-visible {
  color: var(--color-text);
  background: var(--color-surface-elevated);
}

.settings-drawer__close .icon,
.lyrics-panel__close .icon,
.about-panel__close .icon {
  width: 20px;
  height: 20px;
}

/* --------------------------------------------------------------------------
   Content Area
   -------------------------------------------------------------------------- */

.settings-drawer__content,
.lyrics-panel__content {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  width: 100%;
  /* Scrollbar styling (about-panel scrolls on __body, styled in about.css) */
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.settings-drawer__content::-webkit-scrollbar,
.lyrics-panel__content::-webkit-scrollbar {
  width: 4px;
}

.settings-drawer__content::-webkit-scrollbar-track,
.lyrics-panel__content::-webkit-scrollbar-track {
  background: transparent;
}

.settings-drawer__content::-webkit-scrollbar-thumb,
.lyrics-panel__content::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

/* --------------------------------------------------------------------------
   Responsive — Tablet+
   -------------------------------------------------------------------------- */

@media (min-width: 768px) {
  .settings-drawer,
  .about-panel {
    padding: var(--space-6);
  }

  .settings-drawer__header,
  .settings-drawer__content,
  .about-panel__header,
  .about-panel__body {
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* --------------------------------------------------------------------------
   Safe Area — bottom inset for panels that sit at viewport bottom
   -------------------------------------------------------------------------- */

.about-panel__body,
.lyrics-panel__content {
  padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0));
}

/* --------------------------------------------------------------------------
   Panel Scrim
   -------------------------------------------------------------------------- */

.panel-scrim {
  position: fixed;
  inset: 0;
  background: var(--surface-scrim);
  z-index: calc(var(--z-panel) - 1);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.panel-scrim:not([hidden]) {
  opacity: 1;
}

.panel-scrim[hidden] {
  display: block !important;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   Reduced Motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .settings-drawer,
  .lyrics-panel,
  .about-panel {
    transition: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: var(--color-surface);
  }

  .panel-scrim {
    transition: none;
  }
}