/**
 * MDB Shared Dialog Component Styles
 *
 * Reusable dialog/modal classes for all MDB applications.
 * Requires mdb-tokens.css to be loaded first for CSS variable definitions.
 *
 * Visual language — double-layer frosted glass (see shared-ui-patterns.md):
 *   - Layer 1 (backdrop): saturated blur over full viewport
 *   - Layer 2 (card): higher blur + opacity, semi-transparent glass surface
 *   - Header bar using --mdb-header-bg with primary icon + white title
 *   - System sans-serif typography throughout
 *   - Scale-in entrance animation
 *   - @supports fallback for browsers without backdrop-filter
 *   - prefers-reduced-transparency media query for accessibility
 *
 * Classes: .dialog-backdrop, .dialog, .dialog-header, .dialog-close,
 *          .dialog-body, .dialog-error, .dialog-success, .dialog-footer,
 *          .dialog-message, .form-field, .form-hint,
 *          .btn-primary, .btn-secondary, .btn-danger
 */

/* ============================================================
   BACKDROP — frosted glass overlay (Layer 1)
   Saturated blur keeps colours vibrant through the frost.
   See shared-ui-patterns.md §1 for rationale.
   ============================================================ */
.dialog-backdrop {
  position: fixed;
  inset: 0;
  /* Solid fallback for browsers without backdrop-filter */
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--mdb-z-modal, 1000);
  animation: dialogFadeIn 0.2s ease-out;
}

@supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)) {
  .dialog-backdrop {
    background: var(--mdb-glass-overlay-tint);
    backdrop-filter:
      blur(var(--mdb-glass-overlay-blur))
      saturate(var(--mdb-glass-overlay-saturate))
      brightness(var(--mdb-glass-overlay-brightness));
    -webkit-backdrop-filter:
      blur(var(--mdb-glass-overlay-blur))
      saturate(var(--mdb-glass-overlay-saturate))
      brightness(var(--mdb-glass-overlay-brightness));
  }
}

/* Reduced transparency: fully opaque for accessibility */
@media (prefers-reduced-transparency: reduce) {
  .dialog-backdrop {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: var(--mdb-color-bg-overlay, rgba(0, 0, 0, 0.6));
  }
}

@keyframes dialogFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ============================================================
   DIALOG PANEL — frosted glass card (Layer 2)
   Higher blur radius + opacity creates a second depth plane.
   ============================================================ */
.dialog {
  background: var(--mdb-glass-card-bg);
  backdrop-filter:
    blur(var(--mdb-glass-card-blur))
    saturate(var(--mdb-glass-card-saturate));
  -webkit-backdrop-filter:
    blur(var(--mdb-glass-card-blur))
    saturate(var(--mdb-glass-card-saturate));
  border: 1px solid var(--mdb-glass-card-border);
  border-radius: var(--mdb-radius-xl);
  width: 90%;
  max-width: 480px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--mdb-glass-card-shadow);
  font-family: var(--mdb-font-sans);
  animation: dialogScaleIn 0.2s ease-out;
}

/* Reduced transparency: opaque card */
@media (prefers-reduced-transparency: reduce) {
  .dialog {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: var(--mdb-color-bg-secondary);
    border-color: var(--mdb-color-border);
    box-shadow: var(--mdb-shadow-xl);
  }
}

@keyframes dialogScaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============================================================
   HEADER — dark bar with primary-coloured icon + white title
   ============================================================ */
.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px 6px;
  background: rgba(0, 0, 0, 0.72);
  border-bottom: 1px solid var(--mdb-glass-card-border);
}

.dialog-header h2 {
  margin: 0;
  font-size: var(--mdb-text-md);
  font-weight: var(--mdb-font-semibold);
  color: var(--mdb-header-text, #ffffff);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Icon slot in header — primary colour accent */
.dialog-header h2 .material-symbols-outlined {
  font-size: 22px;
  color: var(--mdb-color-primary);
}

.dialog-close {
  background: none;
  border: none;
  padding: 6px;
  cursor: pointer;
  color: rgba(255, 255, 255, 0.6);
  font-family: var(--mdb-font-sans);
  border-radius: var(--mdb-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.15s ease;
}

.dialog-close:hover {
  color: rgba(255, 255, 255, 0.95);
}

.dialog-close .material-symbols-outlined {
  font-size: 20px;
}

/* ============================================================
   BODY
   ============================================================ */
.dialog-body {
  padding: var(--mdb-space-5);
  overflow-y: auto;
  flex: 1;
  /* Firefox scrollbar */
  scrollbar-width: thin;
  scrollbar-color: var(--mdb-color-border) transparent;
}

/* Webkit scrollbar — floating style matching MDPA sidebars */
.dialog-body::-webkit-scrollbar {
  width: 12px;
}

.dialog-body::-webkit-scrollbar-track {
  background: transparent;
  margin: 8px 0;
}

.dialog-body::-webkit-scrollbar-thumb {
  background: var(--mdb-color-border);
  border-radius: var(--mdb-radius-md);
  border: 3px solid transparent;
  border-right-width: 4px;
  background-clip: padding-box;
  min-height: 48px;
}

.dialog-body::-webkit-scrollbar-thumb:hover {
  background: var(--mdb-color-text-muted);
  border: 3px solid transparent;
  border-right-width: 4px;
  background-clip: padding-box;
}

.dialog-body::-webkit-scrollbar-corner {
  background: transparent;
}

/* ============================================================
   ERROR / SUCCESS BANNERS
   ============================================================ */
.dialog-error {
  display: flex;
  align-items: center;
  gap: var(--mdb-space-2);
  padding: var(--mdb-space-3);
  background: var(--mdb-color-error-subtle);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--mdb-radius-md);
  color: var(--mdb-color-error);
  margin-bottom: var(--mdb-space-4);
  font-size: var(--mdb-text-sm);
  font-family: var(--mdb-font-sans);
}

.dialog-error .material-symbols-outlined {
  font-size: 18px;
  flex-shrink: 0;
}

.dialog-error.dialog-success {
  color: var(--mdb-color-success);
  background: var(--mdb-color-success-subtle);
  border-color: rgba(34, 197, 94, 0.3);
}

/* ============================================================
   FOOTER
   ============================================================ */
.dialog-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--mdb-space-3);
  padding: 8px 20px;
  border-top: 1px solid var(--mdb-glass-card-border);
  background: rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] .dialog-footer,
:root:has([data-theme="dark"]) .dialog-footer {
  background: rgba(255, 255, 255, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .dialog-footer {
    background: rgba(255, 255, 255, 0.12);
  }
}

/* ============================================================
   FORM FIELDS
   ============================================================ */
.form-field {
  margin-bottom: var(--mdb-space-3);
}

.form-field:last-child {
  margin-bottom: 0;
}

.form-field label {
  display: block;
  margin-bottom: 6px;
  font-size: var(--mdb-text-sm);
  font-weight: var(--mdb-font-medium);
  color: var(--mdb-color-text);
  font-family: var(--mdb-font-sans);
}

.form-field input,
.form-field textarea,
.form-field select {
  width: 100%;
  padding: 8px 12px;
  background: var(--mdb-color-bg);
  border: 1px solid var(--mdb-color-border);
  border-radius: var(--mdb-radius-xs);
  color: var(--mdb-color-text);
  font-size: var(--mdb-text-sm);
  font-family: var(--mdb-font-sans);
  transition: border-color 0.15s ease;
  box-sizing: border-box;
}

.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--mdb-color-primary);
  box-shadow: 0 0 0 2px var(--mdb-color-primary-subtle);
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--mdb-color-text-muted);
}

.form-field textarea {
  resize: vertical;
  min-height: 80px;
}

.form-field select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

.form-hint {
  display: block;
  margin-top: var(--mdb-space-1);
  margin-bottom: var(--mdb-space-1);
  font-size: var(--mdb-text-xs);
  color: var(--mdb-color-text-muted);
  font-family: var(--mdb-font-sans);
}

/* Hint that appears after input (default) */
.form-field input + .form-hint,
.form-field textarea + .form-hint,
.form-field select + .form-hint {
  margin-top: var(--mdb-space-1);
  margin-bottom: 0;
}

/* Disabled inputs */
.form-field input:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  background: var(--mdb-color-bg-tertiary);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary,
.btn-secondary {
  padding: var(--mdb-space-2) var(--mdb-space-4);
  border-radius: var(--mdb-radius-sm);
  font-size: var(--mdb-text-sm);
  font-weight: var(--mdb-font-medium);
  font-family: var(--mdb-font-sans);
  cursor: pointer;
  transition: all 0.15s ease;
  border: none;
}

.btn-primary {
  background: var(--mdb-color-primary);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--mdb-color-primary-hover);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--mdb-color-bg-tertiary);
  color: var(--mdb-color-text);
  border: 1px solid var(--mdb-color-border);
}

.btn-secondary:hover:not(:disabled) {
  filter: brightness(1.1);
}

.btn-danger {
  padding: var(--mdb-space-2) var(--mdb-space-4);
  border-radius: var(--mdb-radius-sm);
  font-size: var(--mdb-text-sm);
  font-weight: var(--mdb-font-medium);
  font-family: var(--mdb-font-sans);
  cursor: pointer;
  transition: all 0.15s ease;
  background: var(--mdb-color-error);
  color: #fff;
  border: none;
}

.btn-danger:hover:not(:disabled) {
  filter: brightness(0.9);
}

.btn-danger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-danger .material-symbols-outlined {
  font-size: 16px;
  padding: 0px 6px 2px 0px;
}

/* ============================================================
   CONFIRMATION DIALOG
   ============================================================ */
.dialog-message {
  font-size: var(--mdb-text-sm);
  color: var(--mdb-color-text-muted);
  line-height: var(--mdb-leading-relaxed);
  font-family: var(--mdb-font-sans);
}

.dialog-message strong {
  color: var(--mdb-color-text);
}