/* ============================================
   MD3 Alert Banner Component - Goldstandard
   ============================================
   Purpose: Error/warning/info/success alerts with icon, title, and message
   Dependencies: tokens.css, typography.css
   
   Components:
   - .md3-alert: Base alert container
   - .md3-alert--banner: Full-width banner for page/section alerts
   - .md3-alert--inline: Compact inline alerts for forms
   - .md3-field-support: Field supporting text
   - .md3-field-error: Field error messages
   
   Variants:
   - .md3-alert--error: Error state (red, uses error-container)
   - .md3-alert--warning: Warning state (amber)
   - .md3-alert--info: Info state (primary blue)
   - .md3-alert--success: Success state (green)
   ============================================ */

/* ============================================
   1. Alert Base Container
   ============================================ */
.md3-alert {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-4);
  border-radius: var(--radius-md);
  border-left: 4px solid transparent;
  align-items: flex-start;
  animation: alert-slide-down 300ms cubic-bezier(0.4, 0, 0.2, 1);
  /* Default: neutral surface */
  background-color: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
}

/* ============================================
   2. Alert Layout Variants
   ============================================ */

/* Banner variant: Full-width for page/section alerts */
.md3-alert--banner {
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-lg);
  border-left-width: 6px;
}

/* Inline variant: Compact for form contexts */
.md3-alert--inline {
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-4);
  border-radius: var(--radius-md);
  border-left-width: 4px;
}

/* ============================================
   3. Alert Icon
   ============================================ */
.md3-alert__icon {
  font-size: 1.5rem;
  width: 1.5rem;
  height: 1.5rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  /* Align with first line of text */
  margin-top: 1px;
}

.md3-alert--inline .md3-alert__icon {
  font-size: 1.25rem;
  width: 1.25rem;
  height: 1.25rem;
}

/* ============================================
   4. Alert Content
   ============================================ */
.md3-alert__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  flex-grow: 1;
  min-width: 0; /* Allow text wrapping */
}

/* Alert Title - md3-title-small */
.md3-alert__title {
  font-family: var(--md-sys-typescale-title-small-font-family, inherit);
  font-size: var(--md-sys-typescale-title-small-font-size, 0.875rem);
  font-weight: var(--md-sys-typescale-title-small-font-weight, 500);
  line-height: var(--md-sys-typescale-title-small-line-height, 1.25rem);
  letter-spacing: var(--md-sys-typescale-title-small-letter-spacing, 0.1px);
  margin: 0;
}

/* Alert Text - md3-body-medium */
.md3-alert__text {
  font-family: var(--md-sys-typescale-body-medium-font-family, inherit);
  font-size: var(--md-sys-typescale-body-medium-font-size, 0.875rem);
  font-weight: var(--md-sys-typescale-body-medium-font-weight, 400);
  line-height: var(--md-sys-typescale-body-medium-line-height, 1.25rem);
  letter-spacing: var(--md-sys-typescale-body-medium-letter-spacing, 0.25px);
  margin: 0;
}

/* Alert Message (legacy alias for text) */
.md3-alert__message {
  font-family: var(--md-sys-typescale-body-medium-font-family, inherit);
  font-size: var(--md-sys-typescale-body-medium-font-size, 0.875rem);
  font-weight: var(--md-sys-typescale-body-medium-font-weight, 400);
  line-height: var(--md-sys-typescale-body-medium-line-height, 1.25rem);
  letter-spacing: var(--md-sys-typescale-body-medium-letter-spacing, 0.25px);
  margin: 0;
}

/* Inline variant: tighter typography */
.md3-alert--inline .md3-alert__title {
  font-size: var(--md-sys-typescale-label-large-font-size, 0.875rem);
  font-weight: var(--md-sys-typescale-label-large-font-weight, 500);
  line-height: var(--md-sys-typescale-label-large-line-height, 1.25rem);
}

.md3-alert--inline .md3-alert__text,
.md3-alert--inline .md3-alert__message {
  font-size: var(--md-sys-typescale-body-small-font-size, 0.75rem);
  line-height: var(--md-sys-typescale-body-small-line-height, 1rem);
}

/* ============================================
   5. Color Variants - MD3 Container Colors
   ============================================ */

/* Error Variant - Uses error-container tokens */
.md3-alert--error {
  background-color: var(--md-sys-color-error-container, #fdecea);
  border-left-color: var(--md-sys-color-error, #b3261e);
  color: var(--md-sys-color-on-error-container, #410e0b);
}

.md3-alert--error .md3-alert__icon {
  color: var(--md-sys-color-error, #b3261e);
}

.md3-alert--error .md3-alert__title {
  color: var(--md-sys-color-on-error-container, #410e0b);
}

.md3-alert--error .md3-alert__text,
.md3-alert--error .md3-alert__message {
  color: var(--md-sys-color-on-error-container, #410e0b);
}

/* Warning Variant - Amber tones */
.md3-alert--warning {
  background-color: var(--md-sys-color-warning-container, #fff3e0);
  border-left-color: var(--md-sys-color-warning, #f9a825);
  color: var(--md-sys-color-on-warning-container, #4e2c00);
}

.md3-alert--warning .md3-alert__icon {
  color: var(--md-sys-color-warning, #f9a825);
}

.md3-alert--warning .md3-alert__title {
  color: var(--md-sys-color-on-warning-container, #4e2c00);
}

.md3-alert--warning .md3-alert__text,
.md3-alert--warning .md3-alert__message {
  color: var(--md-sys-color-on-warning-container, #4e2c00);
}

/* Info Variant - Primary container tones */
.md3-alert--info {
  background-color: var(--md-sys-color-primary-container, #e8f0fe);
  border-left-color: var(--md-sys-color-primary, #1a73e8);
  color: var(--md-sys-color-on-primary-container, #0d3c61);
}

.md3-alert--info .md3-alert__icon {
  color: var(--md-sys-color-primary, #1a73e8);
}

.md3-alert--info .md3-alert__title {
  color: var(--md-sys-color-on-primary-container, #0d3c61);
}

.md3-alert--info .md3-alert__text,
.md3-alert--info .md3-alert__message {
  color: var(--md-sys-color-on-primary-container, #0d3c61);
}

/* Success Variant - Muted green tones (less prominent than errors) */
.md3-alert--success {
  background-color: color-mix(in srgb,
    var(--md-sys-color-surface) 70%,
    var(--md-sys-color-success-container, #e6f4ea) 30%
  );
  border-left-color: color-mix(in srgb,
    var(--md-sys-color-outline) 40%,
    var(--md-sys-color-success, #34a853) 60%
  );
  color: var(--md-sys-color-on-surface);
}

.md3-alert--success .md3-alert__icon {
  color: color-mix(in srgb,
    var(--md-sys-color-on-surface-variant) 30%,
    var(--md-sys-color-success, #34a853) 70%
  );
}

.md3-alert--success .md3-alert__title {
  color: var(--md-sys-color-on-surface);
}

.md3-alert--success .md3-alert__text,
.md3-alert--success .md3-alert__message {
  color: var(--md-sys-color-on-surface-variant);
}

/* ============================================
   6. Field Support Text
   ============================================ */
.md3-field-support {
  margin-top: var(--space-1);
  padding-left: var(--space-4);
  color: var(--md-sys-color-on-surface-variant);
}

.md3-field-support p {
  margin: 0;
  font-size: var(--md-sys-typescale-body-small-font-size);
  font-weight: var(--md-sys-typescale-body-small-font-weight);
  line-height: var(--md-sys-typescale-body-small-line-height);
  letter-spacing: var(--md-sys-typescale-body-small-letter-spacing);
}

/* ============================================
   7. Field Error Messages
   ============================================ */
.md3-field-error {
  margin-top: var(--space-1);
  padding-left: var(--space-4);
  color: var(--md-sys-color-error);
  min-height: 0;
  overflow: hidden;
  transition: opacity 150ms ease-out, max-height 150ms ease-out;
}

.md3-field-error:empty {
  display: none;
}

.md3-field-error p {
  margin: 0;
  font-size: var(--md-sys-typescale-body-small-font-size);
  font-weight: var(--md-sys-typescale-body-small-font-weight);
  line-height: var(--md-sys-typescale-body-small-line-height);
  letter-spacing: var(--md-sys-typescale-body-small-letter-spacing);
}

/* Legacy compatibility: md3-error-text maps to field-error styling */
.md3-error-text {
  color: var(--md-sys-color-error);
  font-size: var(--md-sys-typescale-body-small-font-size);
  font-weight: var(--md-sys-typescale-body-small-font-weight);
  line-height: var(--md-sys-typescale-body-small-line-height);
  letter-spacing: var(--md-sys-typescale-body-small-letter-spacing);
}

/* ============================================
   8. Animation
   ============================================ */
@keyframes alert-slide-down {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   9. Responsive
   ============================================ */
@media (max-width: 480px) {
  .md3-alert {
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
  }

  .md3-alert--banner {
    padding: var(--space-3) var(--space-4);
    border-left-width: 4px;
  }

  .md3-alert--inline {
    padding: var(--space-2) var(--space-3);
  }

  .md3-alert__icon {
    font-size: 1.25rem;
    width: 1.25rem;
    height: 1.25rem;
  }

  .md3-alert__title {
    font-size: var(--md-sys-typescale-label-large-font-size);
    font-weight: var(--md-sys-typescale-label-large-font-weight);
    line-height: var(--md-sys-typescale-label-large-line-height);
  }

  .md3-alert__text,
  .md3-alert__message {
    font-size: var(--md-sys-typescale-body-small-font-size);
    line-height: var(--md-sys-typescale-body-small-line-height);
  }
  
  .md3-field-support,
  .md3-field-error {
    padding-left: var(--space-3);
  }
}

/* ============================================
   10. Form Status Container
   ============================================
   Used for JS-populated status messages in forms.
   When empty, hidden. When populated by JS with
   md3-alert content, displays properly.
   ============================================ */
.md3-form-status {
  margin-top: var(--space-3);
}

.md3-form-status:empty {
  display: none;
}

/* Ensure alerts inside status container have no extra margin */
.md3-form-status > .md3-alert:last-child {
  margin-bottom: 0;
}

/* ============================================
   11. Alert Positioning Utilities
   ============================================ */

/* Alert above form (default behavior) */
.md3-alert--above {
  margin-bottom: var(--space-4);
  margin-top: 0;
}

/* Alert below content */
.md3-alert--below {
  margin-top: var(--space-4);
  margin-bottom: 0;
}

/* Alert inside card (uses card's internal spacing) */
.md3-card__content > .md3-alert:first-child {
  margin-top: 0;
}

.md3-card__content > .md3-alert:last-child {
  margin-bottom: 0;
}

/* Dismissible alert (with close button) */
.md3-alert--dismissible {
  padding-right: var(--space-10);
  position: relative;
}

.md3-alert__close {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  padding: var(--space-2);
  border: none;
  background: transparent;
  color: inherit;
  cursor: pointer;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.7;
  transition: opacity 150ms ease, background-color 150ms ease;
}

.md3-alert__close:hover {
  opacity: 1;
  background: rgba(0, 0, 0, 0.08);
}

.md3-alert__close .material-symbols-rounded {
  font-size: 1.25rem;
}

/* ============================================
   12. Screen Reader Only Status
   ============================================ */
.md3-sr-status {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}