/**
 * SaniForm Builder Styles
 *
 * Layout:
 * - Header with export button
 * - Sidebar with configuration panels
 * - Preview iframe
 */

/* ========================================
   CSS Variables
   ======================================== */
:root {
  /* Colors */
  --builder-primary: #003366;
  --builder-secondary: #0066cc;
  --builder-background: #f5f5f5;
  --builder-surface: #ffffff;
  --builder-text: #1a1a1a;
  --builder-text-muted: #666666;
  --builder-border: #e0e0e0;
  --builder-success: #28a745;
  --builder-warning: #ffc107;
  --builder-error: #dc3545;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;

  /* Layout */
  --header-height: 60px;
  --sidebar-width: 340px;
  --status-bar-height: 32px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--builder-text);
  background-color: var(--builder-background);
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 600;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ========================================
   NoScript Warning
   ======================================== */
.noscript-warning {
  padding: var(--spacing-xl);
  text-align: center;
  background: var(--builder-warning);
  color: var(--builder-text);
}

/* ========================================
   App Container - CSS Grid Layout
   ======================================== */
.app-container {
  display: grid;
  grid-template-areas:
    "header header"
    "sidebar preview"
    "status status";
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--header-height) 1fr var(--status-bar-height);
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ========================================
   Header
   ======================================== */
.header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
  background: linear-gradient(to right, var(--builder-primary) 0%, #004d99 100%);
  border-bottom: none;
  box-shadow: var(--shadow-md);
  z-index: 100;
}

/* Logo Area */
.header-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  color: white;
  transition: background var(--transition-fast);
}

.logo-icon:hover {
  background: rgba(255, 255, 255, 0.25);
}

.logo-icon svg {
  width: 24px;
  height: 24px;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-text h1 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: white;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.logo-tagline {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.75);
  font-weight: 400;
  letter-spacing: 0.5px;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Header-specific button overrides */
.header .btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.9);
  border-color: rgba(255, 255, 255, 0.2);
}

.header .btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border-color: rgba(255, 255, 255, 0.3);
}

.header .btn-secondary:focus {
  outline-color: rgba(255, 255, 255, 0.5);
}

/* Export button - prominent styling */
.header .btn-primary {
  background: white;
  color: var(--builder-primary);
  border-color: white;
  font-weight: 600;
  padding: var(--spacing-sm) var(--spacing-lg);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.header .btn-primary:hover:not(:disabled) {
  background: #f0f0f0;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.header .btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.header .btn-primary:focus {
  outline-color: rgba(255, 255, 255, 0.8);
}

/* Export button loading state */
.header .btn-primary.loading {
  background: rgba(255, 255, 255, 0.9);
  cursor: wait;
}

/* Separator between secondary and primary actions */
.header-actions::before {
  content: '';
  display: block;
  width: 1px;
  height: 24px;
  background: rgba(255, 255, 255, 0.2);
  margin-right: var(--spacing-sm);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: 4px;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:focus {
  outline: 2px solid var(--builder-secondary);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--builder-primary);
  color: white;
  border-color: var(--builder-primary);
}

.btn-primary:hover:not(:disabled) {
  background: #002244;
}

.btn-secondary {
  background: var(--builder-surface);
  color: var(--builder-text);
  border-color: var(--builder-border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--builder-background);
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.btn-icon {
  font-size: 1em;
}

.btn-loading {
  display: none;
}

.btn.loading .btn-text,
.btn.loading .btn-icon {
  display: none;
}

.btn.loading .btn-loading {
  display: inline;
}

/* ========================================
   Main Content Layout
   ======================================== */
.main-content {
  display: contents; /* Children participate in parent grid */
}

/* ========================================
   Sidebar
   ======================================== */
.sidebar {
  grid-area: sidebar;
  display: flex;
  flex-direction: column;
  background: var(--builder-surface);
  border-right: 1px solid var(--builder-border);
  overflow-y: auto;
  overflow-x: hidden;
}

/* ========================================
   Panels (Collapsible Sections)
   ======================================== */
.panel {
  border-bottom: 1px solid var(--builder-border);
}

.panel:last-child {
  border-bottom: none;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--spacing-md);
  background: transparent;
  border: none;
  text-align: left;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--builder-text);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.panel-header:hover {
  background: var(--builder-background);
}

.panel-header:focus {
  outline: none;
  background: var(--builder-background);
}

.panel-header:focus-visible {
  outline: 2px solid var(--builder-secondary);
  outline-offset: -2px;
}

.panel-header:active {
  background: #e8e8e8;
}

/* Panel title with left border accent when expanded */
.panel-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.panel-header[aria-expanded="true"] .panel-title {
  color: var(--builder-primary);
}

/* Toggle icon with rotation animation */
.panel-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  font-size: 10px;
  color: var(--builder-text-muted);
  transition: transform var(--transition-normal), color var(--transition-fast);
}

.panel-header:hover .panel-toggle {
  color: var(--builder-text);
}

.panel-header[aria-expanded="false"] .panel-toggle {
  transform: rotate(-90deg);
}

.panel-header[aria-expanded="true"] .panel-toggle {
  transform: rotate(0deg);
}

/* Panel content with smooth collapse animation */
.panel-content {
  overflow: hidden;
  padding: 0 var(--spacing-md) var(--spacing-md);
  transition: max-height var(--transition-normal), padding var(--transition-normal), opacity var(--transition-fast);
  max-height: 1000px; /* Large enough for content */
  opacity: 1;
}

.panel-content.collapsed {
  max-height: 0;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
  visibility: hidden;
}

/* Panel content inner wrapper for better animations */
.panel-content-inner {
  padding-top: var(--spacing-sm);
}

/* Panel with accent indicator */
.panel.is-expanded {
  background: linear-gradient(to right, var(--builder-primary) 3px, transparent 3px);
}

/* Panel section count badge */
.panel-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  margin-left: var(--spacing-sm);
  background: var(--builder-background);
  color: var(--builder-text-muted);
  font-size: 11px;
  font-weight: 500;
  border-radius: 10px;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.panel-header:hover .panel-badge {
  background: var(--builder-border);
}

.panel-header[aria-expanded="true"] .panel-badge {
  background: var(--builder-primary);
  color: white;
}

/* ========================================
   Forms
   ======================================== */
.form-group {
  margin-bottom: var(--spacing-md);
}

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--builder-text-muted);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-sm);
  font-size: var(--font-size-base);
  border: 1px solid var(--builder-border);
  border-radius: 4px;
  background: var(--builder-surface);
  color: var(--builder-text);
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--builder-secondary);
  box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.2);
}

.form-input-small {
  width: 80px;
}

.form-hint {
  margin: var(--spacing-xs) 0 0;
  font-size: var(--font-size-sm);
  color: var(--builder-text-muted);
}

/* Color Input */
.color-input-wrapper {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.form-color {
  width: 40px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--builder-border);
  border-radius: 4px;
  cursor: pointer;
}

.form-color::-webkit-color-swatch-wrapper {
  padding: 2px;
}

.form-color::-webkit-color-swatch {
  border: none;
  border-radius: 2px;
}

.color-grid {
  display: grid;
  gap: var(--spacing-md);
}

/* ========================================
   Section List
   ======================================== */
.section-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.section-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: 4px;
  transition: background var(--transition-fast);
}

.section-item:hover {
  background: var(--builder-background);
}

.section-item.loading {
  color: var(--builder-text-muted);
  font-style: italic;
}

.section-item.disabled {
  opacity: 0.6;
}

.section-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin: 0;
  cursor: pointer;
}

.section-item-label {
  flex: 1;
  font-size: var(--font-size-sm);
}

.section-item-drag {
  cursor: grab;
  color: var(--builder-text-muted);
  opacity: 0.5;
  transition: opacity var(--transition-fast);
}

.section-item:hover .section-item-drag {
  opacity: 1;
}

/* Section item checkbox container */
.section-item-checkbox {
  flex-shrink: 0;
}

.section-checkbox {
  width: 18px;
  height: 18px;
  margin: 0;
  cursor: pointer;
  accent-color: var(--builder-primary);
}

/* Section item content area */
.section-item-content {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  min-width: 0; /* Allow text truncation */
}

.section-item-label {
  flex: 1;
  font-size: var(--font-size-sm);
  cursor: pointer;
  padding: var(--spacing-xs) 0;
  border-radius: 2px;
  transition: background var(--transition-fast);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.section-item-label:hover {
  background: rgba(0, 0, 0, 0.05);
}

.section-item-label.custom-title {
  color: var(--builder-primary);
  font-weight: 500;
}

/* Custom title indicator (pencil icon) */
.section-title-indicator {
  margin-left: var(--spacing-xs);
  font-size: 10px;
  opacity: 0.6;
}

/* Title editing input */
.section-title-input {
  flex: 1;
  min-width: 0;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  border: 1px solid var(--builder-secondary);
  border-radius: 4px;
  background: var(--builder-surface);
  color: var(--builder-text);
  outline: none;
  box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.2);
}

.section-title-input:focus {
  border-color: var(--builder-primary);
}

/* Title editing action buttons */
.section-title-actions {
  display: flex;
  gap: 2px;
}

.section-title-save,
.section-title-cancel {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.section-title-save {
  background: var(--builder-success);
  color: white;
}

.section-title-save:hover {
  background: #1ea83a;
}

.section-title-cancel {
  background: var(--builder-border);
  color: var(--builder-text);
}

.section-title-cancel:hover {
  background: #ccc;
}

/* Reset title button */
.section-title-reset {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 4px;
  color: var(--builder-text-muted);
  font-size: 12px;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

.section-item:hover .section-title-reset {
  opacity: 1;
}

.section-title-reset:hover {
  color: var(--builder-warning);
  background: rgba(255, 159, 7, 0.1);
}

/* Disabled section visual indicator */
.section-item.disabled {
  opacity: 0.5;
  background: rgba(0, 0, 0, 0.02);
}

.section-item.disabled .section-item-label {
  text-decoration: line-through;
  color: var(--builder-text-muted);
}

.section-item.disabled:hover {
  opacity: 0.7;
}

/* Error state for section list */
.section-item.error {
  color: var(--builder-error);
  font-style: italic;
  opacity: 0.8;
}

/* ========================================
   Field Editor
   ======================================== */
.field-editor {
  max-height: 500px;
  overflow-y: auto;
}

/* Section group - expandable container */
.field-section {
  border: 1px solid var(--builder-border);
  border-radius: 4px;
  margin-bottom: var(--spacing-sm);
  background: var(--builder-surface);
  overflow: hidden;
}

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

.field-section.expanded {
  border-color: var(--builder-primary);
}

/* Section header - clickable toggle */
.field-section-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-sm);
  background: var(--builder-background);
  border: none;
  text-align: left;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--builder-text);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.field-section-header:hover {
  background: var(--builder-border);
}

.field-section-header:focus {
  outline: none;
  background: var(--builder-border);
}

.field-section-header:focus-visible {
  outline: 2px solid var(--builder-secondary);
  outline-offset: -2px;
}

.field-section.expanded .field-section-header {
  background: var(--builder-primary);
  color: white;
}

.field-section-toggle {
  font-size: 10px;
  transition: transform var(--transition-fast);
}

.field-section-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.field-section-count {
  font-size: 11px;
  font-weight: 400;
  color: var(--builder-text-muted);
  padding: 2px 6px;
  background: var(--builder-surface);
  border-radius: 10px;
}

.field-section.expanded .field-section-count {
  background: rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.9);
}

.field-section-count .custom-count {
  color: var(--builder-primary);
  font-weight: 600;
}

.field-section.expanded .field-section-count .custom-count {
  color: white;
}

/* Section content - field list */
.field-section-content {
  max-height: 1000px;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
}

.field-section-content.collapsed {
  max-height: 0;
  padding: 0;
}

/* Individual field item */
.field-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-bottom: 1px solid var(--builder-border);
  transition: background var(--transition-fast);
}

.field-item:last-child {
  border-bottom: none;
}

.field-item:hover {
  background: var(--builder-background);
}

.field-item.has-custom-label {
  background: rgba(0, 51, 102, 0.03);
}

.field-item.has-custom-label:hover {
  background: rgba(0, 51, 102, 0.06);
}

/* Field type icon */
.field-type-icon {
  flex-shrink: 0;
  width: 20px;
  font-size: 12px;
  text-align: center;
  color: var(--builder-text-muted);
}

/* Field label (display mode) */
.field-label {
  flex: 1;
  font-size: var(--font-size-sm);
  color: var(--builder-text);
  padding: var(--spacing-xs) 0;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-radius: 2px;
  transition: background var(--transition-fast);
}

.field-label:hover {
  background: rgba(0, 0, 0, 0.05);
}

.field-label.custom {
  color: var(--builder-primary);
  font-weight: 500;
}

/* Field edit wrapper (edit mode) */
.field-edit-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.field-label-input {
  flex: 1;
  min-width: 0;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
  border: 1px solid var(--builder-secondary);
  border-radius: 4px;
  background: var(--builder-surface);
  color: var(--builder-text);
  outline: none;
  box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.2);
}

.field-label-input:focus {
  border-color: var(--builder-primary);
}

/* Field edit action buttons */
.field-edit-actions {
  display: flex;
  gap: 2px;
}

.field-save-btn,
.field-cancel-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  border-radius: 4px;
  font-size: 12px;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.field-save-btn {
  background: var(--builder-success);
  color: white;
}

.field-save-btn:hover {
  background: #1ea83a;
}

.field-cancel-btn {
  background: var(--builder-border);
  color: var(--builder-text);
}

.field-cancel-btn:hover {
  background: #ccc;
}

/* Reset button */
.field-reset-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 4px;
  color: var(--builder-text-muted);
  font-size: 12px;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.field-item:hover .field-reset-btn {
  opacity: 1;
}

.field-reset-btn:hover {
  color: var(--builder-warning);
  background: rgba(255, 193, 7, 0.1);
}

/* Error state for field editor */
.field-editor .form-hint.error {
  color: var(--builder-error);
}

/* ========================================
   Preview Container
   ======================================== */
.preview-container {
  grid-area: preview;
  display: flex;
  flex-direction: column;
  background: var(--builder-background);
  overflow: hidden;
}

/* Preview Header - Toolbar Style */
.preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--builder-surface);
  border-bottom: 1px solid var(--builder-border);
  min-height: 44px;
}

.preview-header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.preview-header h2 {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--builder-text);
  margin: 0;
}

.preview-header h2::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--builder-success);
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

/* Live indicator when preview is synced */
.preview-container.synced .preview-header h2::before {
  opacity: 1;
}

.preview-container.loading .preview-header h2::before {
  background: var(--builder-warning);
  opacity: 1;
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* Viewport controls */
.preview-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.preview-viewport-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 4px;
  color: var(--builder-text-muted);
  font-size: 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preview-viewport-btn:hover {
  background: var(--builder-background);
  color: var(--builder-text);
}

.preview-viewport-btn:focus {
  outline: none;
  border-color: var(--builder-secondary);
}

.preview-viewport-btn.active {
  background: var(--builder-primary);
  color: white;
  border-color: var(--builder-primary);
}

.preview-viewport-btn.active:hover {
  background: #002244;
}

/* Zoom control */
.preview-zoom {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-left: var(--spacing-sm);
  padding-left: var(--spacing-sm);
  border-left: 1px solid var(--builder-border);
}

.preview-zoom-label {
  font-size: var(--font-size-sm);
  color: var(--builder-text-muted);
  min-width: 40px;
  text-align: center;
}

.preview-zoom-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  background: var(--builder-background);
  border: 1px solid var(--builder-border);
  border-radius: 4px;
  color: var(--builder-text);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preview-zoom-btn:hover {
  background: var(--builder-border);
}

.preview-zoom-btn:focus {
  outline: none;
  border-color: var(--builder-secondary);
}

.preview-zoom-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Refresh button */
.preview-header .btn-refresh {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: transparent;
  border: 1px solid var(--builder-border);
  border-radius: 4px;
  color: var(--builder-text-muted);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preview-header .btn-refresh:hover {
  background: var(--builder-background);
  color: var(--builder-text);
  border-color: var(--builder-text-muted);
}

.preview-header .btn-refresh:focus {
  outline: none;
  border-color: var(--builder-secondary);
}

.preview-header .btn-refresh .icon {
  display: inline-block;
  transition: transform var(--transition-normal);
}

.preview-header .btn-refresh:hover .icon {
  transform: rotate(180deg);
}

.preview-container.loading .btn-refresh .icon {
  animation: spin 1s linear infinite;
}

/* Preview Wrapper - Document Container */
.preview-wrapper {
  flex: 1;
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: var(--spacing-lg);
  overflow: auto;
  /* Subtle grid pattern background */
  background-color: var(--builder-background);
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
  background-size: 20px 20px;
}

/* Iframe container with document-like appearance */
.preview-frame-container {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--builder-surface);
  border-radius: 8px;
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.08),
    0 8px 24px rgba(0, 0, 0, 0.12);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  /* Default desktop viewport */
  width: 100%;
  max-width: 1200px;
  height: 100%;
}

/* Viewport size variations */
.preview-frame-container.viewport-desktop {
  max-width: 1200px;
}

.preview-frame-container.viewport-tablet {
  max-width: 768px;
}

.preview-frame-container.viewport-mobile {
  max-width: 375px;
}

/* URL bar decoration (optional chrome) */
.preview-url-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: linear-gradient(to bottom, #f8f8f8 0%, #f0f0f0 100%);
  border-bottom: 1px solid var(--builder-border);
}

.preview-url-bar-dots {
  display: flex;
  gap: 6px;
}

.preview-url-bar-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--builder-border);
}

.preview-url-bar-dot.red { background: #ff5f57; }
.preview-url-bar-dot.yellow { background: #febc2e; }
.preview-url-bar-dot.green { background: #28c840; }

.preview-url-bar-address {
  flex: 1;
  padding: 4px var(--spacing-sm);
  background: white;
  border: 1px solid var(--builder-border);
  border-radius: 4px;
  font-size: var(--font-size-sm);
  color: var(--builder-text-muted);
  font-family: monospace;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.preview-url-bar-address::before {
  content: '🔒 ';
}

/* The actual iframe */
.preview-frame {
  flex: 1;
  width: 100%;
  height: 100%;
  min-height: 400px;
  border: none;
  background: white;
}

/* Iframe loading state - subtle overlay */
.preview-frame-container.loading .preview-frame {
  opacity: 0.6;
}

/* Preview States - Centered Overlays */
.preview-loading,
.preview-error,
.preview-empty {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-xl);
  background: var(--builder-surface);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  z-index: 10;
  min-width: 280px;
}

/* Loading state */
.preview-loading {
  gap: var(--spacing-md);
}

.preview-loading .spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--builder-border);
  border-top-color: var(--builder-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.preview-loading p {
  margin: 0;
  color: var(--builder-text-muted);
  font-size: var(--font-size-base);
}

.preview-loading-progress {
  width: 200px;
  height: 4px;
  background: var(--builder-border);
  border-radius: 2px;
  overflow: hidden;
}

.preview-loading-progress-bar {
  height: 100%;
  background: var(--builder-primary);
  border-radius: 2px;
  animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
  0% { width: 0%; margin-left: 0; }
  50% { width: 60%; margin-left: 20%; }
  100% { width: 0%; margin-left: 100%; }
}

/* Error state */
.preview-error {
  background: #fff5f5;
  border: 1px solid #fecaca;
  gap: var(--spacing-md);
}

.preview-error-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fee2e2;
  border-radius: 50%;
  font-size: 24px;
}

.preview-error .error-title {
  margin: 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--builder-error);
}

.preview-error .error-message {
  margin: 0;
  color: #991b1b;
  font-size: var(--font-size-sm);
  max-width: 300px;
}

.preview-error .btn {
  margin-top: var(--spacing-sm);
}

/* Empty state - initial view before first load */
.preview-empty {
  background: transparent;
  box-shadow: none;
  gap: var(--spacing-md);
  color: var(--builder-text-muted);
}

.preview-empty-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--builder-surface);
  border: 2px dashed var(--builder-border);
  border-radius: 12px;
  font-size: 32px;
  opacity: 0.6;
}

.preview-empty p {
  margin: 0;
  font-size: var(--font-size-base);
}

.preview-empty-hint {
  font-size: var(--font-size-sm);
  color: var(--builder-text-muted);
  opacity: 0.8;
}

/* ========================================
   Status Bar
   ======================================== */
.status-bar {
  grid-area: status;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-md);
  background: var(--builder-surface);
  border-top: 1px solid var(--builder-border);
  font-size: var(--font-size-sm);
  color: var(--builder-text-muted);
}

.status-size {
  font-family: monospace;
}

/* ========================================
   Toast Notifications
   ======================================== */
.toast-container {
  position: fixed;
  bottom: calc(var(--status-bar-height) + var(--spacing-md));
  right: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  z-index: 1000;
}

.toast {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--builder-text);
  color: white;
  border-radius: 4px;
  box-shadow: var(--shadow-md);
  animation: slideIn var(--transition-normal);
}

.toast.success {
  background: var(--builder-success);
}

.toast.error {
  background: var(--builder-error);
}

.toast.warning {
  background: var(--builder-warning);
  color: var(--builder-text);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ========================================
   Utility Classes
   ======================================== */
.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================
   Responsive (Tablet)
   ======================================== */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 280px;
  }

  /* Keep export button text visible, hide others */
  .header .btn-secondary .btn-text {
    display: none;
  }

  .header .btn-secondary {
    padding: var(--spacing-sm);
  }

  /* Keep export button prominent */
  .header .btn-primary .btn-text {
    display: inline;
  }

  /* Smaller logo on tablet */
  .logo-icon {
    width: 36px;
    height: 36px;
  }

  .logo-icon svg {
    width: 20px;
    height: 20px;
  }

  .logo-tagline {
    display: none;
  }

  /* Preview area tablet adjustments */
  .preview-header {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

  .preview-header-left {
    flex-wrap: wrap;
  }

  .preview-zoom {
    display: none;
  }

  .preview-wrapper {
    padding: var(--spacing-md);
  }

  /* Smaller URL bar on tablet */
  .preview-url-bar {
    padding: var(--spacing-xs) var(--spacing-sm);
  }

  .preview-url-bar-dots {
    gap: 4px;
  }

  .preview-url-bar-dot {
    width: 10px;
    height: 10px;
  }
}

/* ========================================
   Responsive (Mobile - Stacked Layout)
   ======================================== */
@media (max-width: 768px) {
  .app-container {
    grid-template-areas:
      "header"
      "sidebar"
      "preview"
      "status";
    grid-template-columns: 1fr;
    grid-template-rows: var(--header-height) auto 1fr var(--status-bar-height);
  }

  .sidebar {
    max-height: 40vh;
    border-right: none;
    border-bottom: 1px solid var(--builder-border);
  }

  .preview-container {
    min-height: 300px;
  }

  /* Mobile header adjustments */
  .header {
    padding: 0 var(--spacing-md);
  }

  .header-logo {
    gap: var(--spacing-sm);
  }

  .logo-icon {
    width: 32px;
    height: 32px;
  }

  .logo-icon svg {
    width: 18px;
    height: 18px;
  }

  .logo-text h1 {
    font-size: var(--font-size-lg);
  }

  /* Hide template buttons on mobile, keep export */
  .header #btn-save-template,
  .header #btn-load-template {
    display: none;
  }

  .header-actions::before {
    display: none;
  }

  .header .btn-primary {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  /* Preview area mobile adjustments */
  .preview-header {
    padding: var(--spacing-xs) var(--spacing-sm);
    min-height: 40px;
  }

  .preview-header-left {
    gap: var(--spacing-sm);
  }

  .preview-header h2 {
    font-size: var(--font-size-sm);
  }

  /* Hide viewport controls on mobile - always mobile view */
  .preview-controls {
    display: none;
  }

  .preview-zoom {
    display: none;
  }

  /* Simplify refresh button */
  .preview-header .btn-refresh span:not(.icon) {
    display: none;
  }

  .preview-header .btn-refresh {
    padding: var(--spacing-xs);
    min-width: 32px;
    justify-content: center;
  }

  /* Preview wrapper mobile */
  .preview-wrapper {
    padding: var(--spacing-sm);
    background-image: none;
  }

  /* Force mobile viewport on mobile */
  .preview-frame-container {
    max-width: 100%;
    border-radius: 0;
  }

  /* Simplify URL bar on mobile */
  .preview-url-bar {
    display: none;
  }

  .preview-frame {
    min-height: 300px;
    border-radius: 0;
  }

  /* Smaller loading/error overlays on mobile */
  .preview-loading,
  .preview-error,
  .preview-empty {
    min-width: auto;
    width: 90%;
    max-width: 280px;
    padding: var(--spacing-lg);
  }

  .preview-loading .spinner {
    width: 40px;
    height: 40px;
  }

  .preview-error-icon {
    width: 40px;
    height: 40px;
    font-size: 20px;
  }

  .preview-empty-icon {
    width: 60px;
    height: 60px;
    font-size: 24px;
  }
}

/* ========================================
   Modal / Dialog Overlay
   ======================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: var(--spacing-md);
  animation: fadeIn var(--transition-fast);
}

.modal-overlay.hidden {
  display: none !important;
}

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

.modal-content {
  background: var(--builder-surface);
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  max-width: 480px;
  width: 100%;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  animation: modalSlideIn var(--transition-normal);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--builder-border);
}

.modal-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 24px;
  flex-shrink: 0;
}

.modal-icon.error {
  background: rgba(220, 53, 69, 0.1);
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--builder-text);
  margin: 0;
}

.modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-top: 1px solid var(--builder-border);
  background: var(--builder-background);
  border-radius: 0 0 8px 8px;
}

/* Error Dialog Specific Styles */
.error-dialog-message {
  margin: 0 0 var(--spacing-md) 0;
  color: var(--builder-text-muted);
  font-size: var(--font-size-base);
}

.error-dialog-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.error-dialog-list li {
  position: relative;
  padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) var(--spacing-lg);
  margin-bottom: var(--spacing-xs);
  background: rgba(220, 53, 69, 0.05);
  border-left: 3px solid var(--builder-error);
  border-radius: 0 4px 4px 0;
  font-size: var(--font-size-sm);
  color: var(--builder-text);
  word-break: break-word;
}

.error-dialog-list li::before {
  content: "×";
  position: absolute;
  left: var(--spacing-xs);
  color: var(--builder-error);
  font-weight: bold;
}

/* Mobile modal adjustments */
@media (max-width: 768px) {
  .modal-content {
    max-width: 100%;
    max-height: 90vh;
    margin: var(--spacing-sm);
  }

  .modal-header {
    padding: var(--spacing-md);
  }

  .modal-icon {
    width: 40px;
    height: 40px;
    font-size: 20px;
  }

  .modal-title {
    font-size: var(--font-size-base);
  }

  .modal-body {
    padding: var(--spacing-md);
  }

  .modal-footer {
    padding: var(--spacing-sm) var(--spacing-md);
  }
}