/* ============================================================================
   MD3 Forms - Corpus-specific layouts (From Legacy md3-components.css)
   ============================================================================
   TRANSFERRED FROM: static/css/md3-components.css (Lines 1471-1732)
  STATUS: ⚠️ Uses some legacy MD3 tokens (--md3-*) in older rules; these
  should be migrated. NOTE: This file also contains a custom checkbox
  implementation which is NOT MD3-canonical. See the TODO below.
   CUSTOM: Corpus search form, filter grid, regional filter section
   ============================================================================ */

/* Form Container */
.md3-corpus-form {
  display: grid;
  gap: var(--space-6);
  padding: var(--space-6);
  background: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-8);
}

/* Search Row (Query + Mode Select) */
.md3-corpus-search-row {
  display: flex;
  gap: var(--space-3);
  align-items: start;
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

/* Desktop: Search + Mode nebeneinander */
.md3-corpus-search-row .md3-outlined-textfield {
  flex: 0 0 auto;
  min-width: 120px;
}

.md3-corpus-search-row .md3-outlined-textfield--flex {
  flex: 1 1 auto;
  min-width: 200px;
}

/* Modo/Search-Mode Select - Optimiert */
#search_mode {
  appearance: none;
}

/* Filter Grid (5 columns on desktop) */
.md3-corpus-filter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-3);
  align-items: start;
}

/* Regional filter section (below grid) */
.md3-regional-filter-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

/* Regional select field - match grid column width */
.md3-regional-select {
  margin-top: var(--space-1);
  width: 200px;
  min-width: 200px;
}

/* Ensure Select2 inside regional filter takes full width */
.md3-regional-select .select2-container {
  width: 200px !important;
}

/* ============================================================================
  Material Design 3 Checkbox (Custom Implementation)

  STATUS: ⚠️ Custom implementation, NOT canonical MD3
  @deprecated: this custom checkbox is a legacy implementation. It is
  kept to preserve current UI behavior, but the long-term plan is to
  replace it with a canonical `.md3-checkbox` implementation that
  matches the MD3 spec (focus ring, correct ripple behaviour, aria states).
  TODO: Provide a canonical `.md3-checkbox` implementation in a later
  change and migrate templates to `.md3-checkbox-legacy` when necessary.
  ============================================================================ */

.md3-checkbox-container {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  padding: 8px 0;
  position: relative;
}

.md3-checkbox-container input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  margin: 0;
}

.md3-checkbox {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border: 2px solid var(--md-sys-color-outline-variant);
  border-radius: 2px;
  background-color: transparent;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  flex-shrink: 0;
}

/* Hover state */
.md3-checkbox-container:hover .md3-checkbox {
  border-color: var(--md-sys-color-on-surface);
}

/* Checked state */
.md3-checkbox-container input[type="checkbox"]:checked + .md3-checkbox {
  background-color: var(--md-sys-color-primary);
  border-color: var(--md-sys-color-primary);
}

/* Checkmark */
.md3-checkbox__checkmark {
  width: 12px;
  height: 12px;
  opacity: 0;
  transition: opacity 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

.md3-checkbox-container
  input[type="checkbox"]:checked
  + .md3-checkbox
  .md3-checkbox__checkmark {
  opacity: 1;
}

.md3-checkbox__checkmark-path {
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 22;
  stroke-dashoffset: 22;
  transition: stroke-dashoffset 0.2s cubic-bezier(0.4, 0, 0.2, 1) 0.1s;
}

.md3-checkbox-container
  input[type="checkbox"]:checked
  + .md3-checkbox
  .md3-checkbox__checkmark-path {
  stroke-dashoffset: 0;
}

/* Focus state */
.md3-checkbox-container input[type="checkbox"]:focus + .md3-checkbox {
  outline: 2px solid var(--md-sys-color-primary);
  outline-offset: 2px;
}

/* Label */
.md3-checkbox__label {
  /* font-family inherited from typography.css */
  font-size: 14px;
  line-height: 1.4;
  /* Use on-surface for better readability (not on-surface-variant) */
  color: var(--md-sys-color-on-surface);
  cursor: pointer;
}

/* Disabled state */
.md3-checkbox-container input[type="checkbox"]:disabled + .md3-checkbox {
  border-color: var(--md-sys-color-outline-variant);
  opacity: 0.38;
}

.md3-checkbox-container input[type="checkbox"]:disabled ~ .md3-checkbox__label {
  color: var(--md-sys-color-on-surface);
  opacity: 0.38;
}

/* Ripple effect (optional, simple version) */
.md3-checkbox::before {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  background-color: currentColor;
  opacity: 0;
  transition: opacity 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

.md3-checkbox-container:active .md3-checkbox::before {
  opacity: 0.12;
}

/* Region field transition */
.md3-region-field {
  transition:
    opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1),
    max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

/* Actions Row (Buttons Container) */
.md3-corpus-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ============================================================================
   Responsive Overrides (from corpus responsive section)
   ============================================================================ */

/* MD3 Compact (0-599px) */
@media (max-width: 599px) {
  .md3-corpus-search-row .md3-outlined-textfield {
    flex: 1 1 100%;
    min-width: 0;
    max-width: 100%;
  }

  #search_mode {
    font-size: 12px;
    padding: var(--space-2) var(--space-3);
    min-height: 40px;
  }

  #search_mode::after {
    display: none;
  }
}

@media (max-width: 400px) {
  #search_mode {
    font-size: 0.875rem;
    padding: var(--space-1) var(--space-2);
    min-height: 36px;
  }
}

/* TABLET: 601px - 1120px (accounting for 280px drawer) */
@media (max-width: 1120px) {
  .md3-corpus-form {
    gap: var(--space-5);
    padding: var(--space-5);
  }

  .md3-corpus-search-row {
    gap: var(--space-2);
    margin-bottom: var(--space-5);
  }

  .md3-corpus-filter-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
  }
}

/* MOBILE STANDARD: MD3 Compact (0-599px) */
@media (max-width: 599px) {
  .md3-corpus-form {
    gap: var(--space-5);
    padding: var(--space-4) var(--space-3);
    margin-bottom: var(--space-6);
  }

  .md3-corpus-search-row {
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
  }

  /* Suchfeld volle Breite */
  .md3-corpus-search-row .md3-outlined-textfield--flex {
    flex: 1 1 100%;
    min-width: 0;
  }

  /* Mode-Select auch volle Breite */
  .md3-corpus-search-row .md3-outlined-textfield {
    flex: 1 1 100%;
    min-width: 0;
  }

  .md3-corpus-filter-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .md3-regional-select {
    width: 100%;
    min-width: auto;
  }

  .md3-regional-select .select2-container {
    width: 100% !important;
  }
}

/* MOBILE SMALL: ≤ 400px */
@media (max-width: 400px) {
  .md3-corpus-form {
    gap: var(--space-4);
    padding: var(--space-3) var(--space-2);
    margin-bottom: var(--space-4);
  }
}