/* Material Design 3 Snackbar Component
 * ==========================================================================
 * MD3 Snackbars provide brief messages about app processes
 * Reference: https://m3.material.io/components/snackbar
 * Surface Level: Uses Level 2 (Container) with high elevation
 */

/* Snackbar Container
 * -------------------------------------------------------------------------- */

.snackbar-container {
  /* Structure */
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--layer-snackbar);
  pointer-events: none;

  /* Layout */
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;

  /* Mobile safe area */
  padding-bottom: calc(1rem + env(safe-area-inset-bottom));
}

/* Position variants */
.snackbar-container--top {
  top: 0;
  bottom: auto;
  padding-top: calc(1rem + env(safe-area-inset-top));
  padding-bottom: 1rem;
}

.snackbar-container--center {
  top: 50%;
  bottom: auto;
  transform: translateY(-50%);
}

/* Snackbar Item (Container surface - Level 2)
 * -------------------------------------------------------------------------- */

.snackbar {
  /* Structure */
  display: flex;
  align-items: center;
  gap: 1rem;
  position: relative;
  pointer-events: auto;

  /* Sizing */
  min-height: 48px;
  max-width: 672px;
  width: 100%;
  padding: 0.875rem 1rem;

  /* Appearance */
  background: var(--color-bg--container);
  color: var(--color-ink--container);
  border-radius: 4px;
  box-shadow:
    0 3px 5px -1px oklch(0 0 0 / 0.2),
    0 6px 10px 0 oklch(0 0 0 / 0.14),
    0 1px 18px 0 oklch(0 0 0 / 0.12);

  /* Animation */
  opacity: 0;
  transform: translateY(100%);
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Show state */
.snackbar--show {
  opacity: 1;
  transform: translateY(0);
}

/* For top position */
.snackbar-container--top .snackbar {
  transform: translateY(-100%);
}

.snackbar-container--top .snackbar--show {
  transform: translateY(0);
}

/* Snackbar Elements
 * -------------------------------------------------------------------------- */

/* Icon (optional) */
.snackbar__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  opacity: 0.9;
}

/* Message */
.snackbar__message {
  flex: 1;
  font-size: 0.875rem;
  line-height: 1.43;
  letter-spacing: 0.01em;
}

/* Action button */
.snackbar__action {
  flex-shrink: 0;
  margin: -0.5rem -0.5rem -0.5rem 0;
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: none;
  border-radius: 4px;
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background 200ms ease;
  outline: none;
}

.snackbar__action:hover {
  background: oklch(from var(--color-primary) l c h / 0.08);
}

.snackbar__action:active {
  background: oklch(from var(--color-primary) l c h / 0.12);
}

.snackbar__action:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Close button (optional) */
.snackbar__close {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  margin: -0.5rem -0.5rem -0.5rem 0;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 50%;
  color: var(--color-ink--container);
  opacity: 0.7;
  cursor: pointer;
  transition: all 200ms ease;
  outline: none;
}

.snackbar__close:hover {
  opacity: 1;
  background: oklch(0 0 0 / 0.08);
}

.snackbar__close:active {
  background: oklch(0 0 0 / 0.12);
}

.snackbar__close:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Snackbar Variants
 * -------------------------------------------------------------------------- */

/* Two-line snackbar */
.snackbar--two-line {
  min-height: 68px;
  align-items: flex-start;
}

.snackbar--two-line .snackbar__icon {
  margin-top: 0.125rem;
}

.snackbar--two-line .snackbar__action,
.snackbar--two-line .snackbar__close {
  align-self: center;
}

/* Longer action snackbar */
.snackbar--longer-action {
  flex-wrap: wrap;
  padding-bottom: 0.5rem;
}

.snackbar--longer-action .snackbar__message {
  width: 100%;
  margin-bottom: 0.5rem;
}

.snackbar--longer-action .snackbar__action {
  margin-left: auto;
}

/* Color variants */
.snackbar--error {
  background: var(--color-error);
  color: var(--color-ink--error);
}

.snackbar--error .snackbar__action {
  color: var(--color-ink--error);
}

.snackbar--success {
  background: var(--color-primary);
  color: var(--color-ink--primary);
}

.snackbar--success .snackbar__action {
  color: var(--color-ink--primary);
}

.snackbar--warning {
  background: var(--color-tertiary);
  color: var(--color-ink--tertiary);
}

.snackbar--warning .snackbar__action {
  color: var(--color-ink--tertiary);
}

/* Dark snackbar (always dark regardless of theme) */
.snackbar--dark {
  background: var(--color-stone-900);
  color: var(--color-stone-100);
}

.snackbar--dark .snackbar__action {
  color: var(--color-primary-300);
}

.snackbar--dark .snackbar__close {
  color: var(--color-stone-100);
}

/* Loading state */
.snackbar--loading .snackbar__icon {
  animation: rotate 1s linear infinite;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Stacked snackbars */
.snackbar-container .snackbar:not(:last-child) {
  opacity: 0.7;
  transform: scale(0.95) translateY(0);
  pointer-events: none;
}

/* Animation for exit */
.snackbar--hide {
  opacity: 0;
  transform: translateY(100%);
  transition: all 200ms cubic-bezier(0.4, 0, 1, 1);
}

.snackbar-container--top .snackbar--hide {
  transform: translateY(-100%);
}

/* Dark mode adjustments
 * -------------------------------------------------------------------------- */

[data-color-scheme="dark"] {
  .snackbar {
    box-shadow:
      0 3px 5px -1px oklch(0 0 0 / 0.3),
      0 6px 10px 0 oklch(0 0 0 / 0.2),
      0 1px 18px 0 oklch(0 0 0 / 0.15);
  }

  .snackbar__close:hover {
    background: oklch(1 0 0 / 0.08);
  }

  .snackbar__close:active {
    background: oklch(1 0 0 / 0.12);
  }
}

/* Responsive behavior
 * -------------------------------------------------------------------------- */

@media (max-width: 40em) {
  .snackbar-container {
    padding: 0;
    align-items: stretch;
  }

  .snackbar {
    max-width: 100%;
    border-radius: 0;
    min-height: 56px;
  }

  .snackbar--two-line {
    min-height: 80px;
  }

  /* Add safe area padding on mobile */
  .snackbar-container:not(.snackbar-container--top) .snackbar {
    padding-bottom: calc(0.875rem + env(safe-area-inset-bottom));
  }
}

/* Examples of usage:
 * -------------------------------------------------------------------------- *
 * Basic snackbar:
 * <%= snackbar "File saved successfully" %>
 *
 * With action:
 * <%= snackbar "Item deleted", action: { text: "Undo", url: "#" } %>
 *
 * With icon:
 * <%= snackbar "Network error", icon: :wifi_off, variant: :error %>
 *
 * Via JavaScript:
 * showSnackbar("Message", { duration: 5000, action: { text: "Retry" } })
 */