/* ── Base Side Panel ─────────────────────────────────────────────────────── */
/*
 * Right-side slide-over panel with a dimmed full-viewport backdrop. The
 * content behind the backdrop stays mounted (not replaced) - this is
 * meant for detail views layered on top of a list (e.g. the feedback
 * board's item detail).
 *
 * Markup:
 *   <div class="base-side-panel-backdrop" data-action="...">
 *   <div class="base-side-panel">
 *     <div class="base-side-panel__header">...</div>
 *     <div class="base-side-panel__body">...</div>
 *     <div class="base-side-panel__footer">...</div>
 *   </div>
 *
 * JS: window.BaseSidePanel.open(panelEl, backdropEl, opts)
 *     window.BaseSidePanel.close(panelEl, backdropEl, opts)
 *     window.BaseSidePanel.create(options) / .show(options)
 */

.base-side-panel-backdrop {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, var(--text-color, #000000) 40%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s ease;
  z-index: 9990;
}
.base-side-panel-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

.base-side-panel {
  --side-panel-width: 520px;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(var(--side-panel-width), 100vw);
  background: var(--card-bg);
  background:
    linear-gradient(var(--card-bg), var(--card-bg)),
    var(--side-panel-base, var(--container-bg, var(--card-bg)));
  border-left: 1px solid var(--border-color);
  box-shadow: -18px 0 48px
    color-mix(in srgb, var(--text-color, #000000) 16%, transparent);
  transform: translateX(100%);
  transition: transform 0.34s cubic-bezier(0.22, 0.61, 0.36, 1);
  z-index: 9991;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.base-side-panel.is-open {
  transform: translateX(0);
}

.base-side-panel--left {
  right: auto;
  left: 0;
  border-right: 1px solid var(--border-color);
  border-left: 0;
  box-shadow: 18px 0 48px
    color-mix(in srgb, var(--text-color, #000000) 16%, transparent);
  transform: translateX(-100%);
}

.base-side-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.base-side-panel__body {
  flex: 1;
  overflow: auto;
  padding: 20px;
}

.base-side-panel__footer {
  flex-shrink: 0;
  padding: 14px 20px;
  border-top: 1px solid var(--border-color);
}

.base-side-panel--built {
  overflow: hidden;
  max-width: 100vw;
}

.base-side-panel--built[hidden] {
  display: none;
}

.base-side-panel--built .base-side-panel__header {
  position: relative;
  align-items: flex-start;
  justify-content: flex-start;
  padding: 18px 60px 18px 22px;
}

.base-side-panel__lead {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
}

.base-side-panel__lead[hidden],
.base-side-panel__subtitle[hidden],
.base-side-panel__footer[hidden] {
  display: none;
}

.base-side-panel__heading {
  flex: 1 1 auto;
  min-width: 0;
  align-self: center;
}

.base-side-panel__title {
  margin: 0 !important;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--heading-color, var(--text-color));
  overflow-wrap: anywhere;
}

.base-side-panel__subtitle {
  margin: 3px 0 0 !important;
  font-size: 13px;
  line-height: 1.45;
  color: var(--muted-text);
}

.base-side-panel button.base-side-panel__close {
  position: absolute;
  top: 12px;
  right: 14px;
  z-index: 1;
  width: 36px !important;
  min-width: 0 !important;
  height: 36px !important;
  margin: 0 !important;
  padding: 0 !important;
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  border: 0 !important;
  border-radius: 999px !important;
  background: transparent !important;
  box-shadow: none !important;
  color: var(--muted-text) !important;
  font-size: 24px !important;
  font-weight: 400 !important;
  line-height: 1 !important;
  letter-spacing: normal !important;
  text-transform: none !important;
  cursor: pointer;
  transition:
    background 0.15s ease,
    color 0.15s ease;
}

.base-side-panel button.base-side-panel__close:hover {
  background: var(--item-hover-bg, var(--container-bg)) !important;
  color: var(--text-color) !important;
}

.base-side-panel button.base-side-panel__close:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

.base-side-panel--built .base-side-panel__body {
  overscroll-behavior: contain;
  padding: 20px 22px;
}

.base-side-panel--built .base-side-panel__footer {
  padding: 14px 22px 18px;
}

@media (max-width: 720px) {
  .base-side-panel {
    width: 100vw;
  }

  .base-side-panel--sheet {
    top: auto;
    left: 0;
    right: 0;
    height: 88vh;
    height: 88dvh;
    border-top: 1px solid var(--border-color);
    border-left: 0;
    border-right: 0;
    border-radius: 18px 18px 0 0;
    box-shadow: 0 -18px 48px
      color-mix(in srgb, var(--text-color, #000000) 16%, transparent);
    transform: translateY(100%);
  }

  .base-side-panel--sheet.is-open {
    transform: translateY(0);
  }

  .base-side-panel--sheet .base-side-panel__footer {
    padding-bottom: calc(18px + env(safe-area-inset-bottom, 0px));
  }
}

@media (prefers-reduced-motion: reduce) {
  .base-side-panel,
  .base-side-panel-backdrop {
    transition: none;
  }
}