@layer components {
  /* ── Toast stack: fixed top-right overlay for all flash messages ────── */

  .app-toast-stack {
    position: fixed;
    top: calc(var(--app-spacing) * 1.5);
    right: calc(var(--app-spacing) * 1.5);
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: calc(var(--app-spacing) * 0.5);
    width: 400px;
    max-width: calc(100vw - var(--app-spacing) * 3);
    pointer-events: none;
  }

  .app-toast-stack:empty {
    display: none;
  }

  /* In admin layout: offset below topbar */
  .app-container ~ .app-toast-stack,
  body:has(.app-container) .app-toast-stack {
    top: calc(52px + var(--app-spacing));
  }

  @media (max-width: 576px) {
    .app-toast-stack {
      top: calc(var(--app-spacing) * 1);
      right: calc(var(--app-spacing) * 1);
      left: calc(var(--app-spacing) * 1);
      width: auto;
    }

    body:has(.app-container) .app-toast-stack {
      top: calc(52px + var(--app-spacing) * 0.5);
      right: calc(var(--app-spacing) * 0.5);
      left: calc(var(--app-spacing) * 0.5);
    }
  }

  /* ── Individual toast notice ─────────────────────────────────────────── */

  .app-toast-stack .notice {
    --app-notice-border-color: var(--app-muted-border-color);
    --app-notice-background-color: var(--app-background-color);
    --app-notice-accent-color: var(--app-color);
    --_toast-tint: transparent;
    background: linear-gradient(var(--_toast-tint), var(--_toast-tint)), var(--app-background-color);
    border: 1px solid color-mix(in srgb, var(--app-notice-border-color) 40%, transparent);
    border-left: 3px solid var(--app-notice-border-color);
    border-radius: var(--app-border-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15), 0 1px 3px rgba(0, 0, 0, 0.08);
    padding: calc(var(--app-spacing) * 0.625) calc(var(--app-spacing) * 0.875);
    padding-right: calc(var(--app-spacing) * 0.5);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: calc(var(--app-spacing) * 0.75);
    position: relative;
    overflow: hidden;
    color: var(--app-notice-border-color);
    font-size: 0.875rem;
    line-height: 1.4;
    pointer-events: auto;
    margin: 0;
    animation: toast-slide-in 250ms ease-out;
  }

  .app-toast-stack .notice.toast-dismissing {
    animation: toast-slide-out 200ms ease-in forwards;
  }

  @keyframes toast-slide-in {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
  }

  @keyframes toast-slide-out {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(20px); }
  }

  @media (prefers-reduced-motion: reduce) {
    .app-toast-stack .notice,
    .app-toast-stack .notice.toast-dismissing {
      animation: none;
    }
  }

  /* ── Variant colors ──────────────────────────────────────────────────── */

  .app-toast-stack .notice strong {
    color: var(--app-notice-accent-color);
  }

  .app-toast-stack .notice[data-variant=success] {
    --app-notice-border-color: var(--app-notice-success-border-color);
    --_toast-tint: var(--app-notice-success-background-color);
    --app-notice-accent-color: var(--app-notice-success-color);
  }

  .app-toast-stack .notice[data-variant=warning] {
    --app-notice-border-color: var(--app-notice-warning-border-color);
    --_toast-tint: var(--app-notice-warning-background-color);
    --app-notice-accent-color: var(--app-notice-warning-color);
  }

  .app-toast-stack .notice[data-variant=info] {
    --app-notice-border-color: var(--app-notice-info-border-color);
    --_toast-tint: var(--app-notice-info-background-color);
    --app-notice-accent-color: var(--app-notice-info-color);
  }

  .app-toast-stack .notice[data-variant=error] {
    --app-notice-border-color: var(--app-notice-error-border-color);
    --_toast-tint: var(--app-notice-error-background-color);
    --app-notice-accent-color: var(--app-notice-error-color);
  }

  /* ── Progress bar timer ──────────────────────────────────────────────── */

  .app-toast-stack .notice.flash-timed::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    height: 2px;
    width: 100%;
    background: var(--app-notice-border-color);
    transform-origin: left;
    transform: scaleX(0);
    animation: flash-progress var(--flash-timeout, 4000ms) linear forwards;
    opacity: 0.7;
  }

  .app-toast-stack .notice.flash-timed:hover::after {
    animation-play-state: paused;
  }

  @keyframes flash-progress {
    from { transform: scaleX(0); }
    to { transform: scaleX(1); }
  }

  @media (prefers-reduced-motion: reduce) {
    .app-toast-stack .notice.flash-timed::after {
      animation: none;
    }
  }

  /* ── Dismiss button ──────────────────────────────────────────────────── */

  .app-toast-stack .notice button[type=submit],
  .app-toast-stack .notice button[type=button] {
    border: none !important;
    background: transparent;
    color: var(--app-notice-border-color);
    opacity: 0.6;
    cursor: pointer;
    padding: 2px 4px;
    line-height: 1;
    flex-shrink: 0;
  }

  .app-toast-stack .notice button[type=submit]:hover,
  .app-toast-stack .notice button[type=button]:hover {
    opacity: 1;
  }

  /* ── List formatting inside notices ──────────────────────────────────── */

  .app-toast-stack .notice ul {
    margin: 0;
    padding-left: 0;
  }

  .app-toast-stack .notice li {
    list-style: none;
  }

  .app-toast-stack .notice li:last-child {
    margin: 0;
  }
}