/* iOS-style CSS for PDF2EPUB Web Interface */

/* ===== CSS Variables ===== */
:root {
  /* Colors - iOS System Colors */
  --ios-blue: #007AFF;
  --ios-green: #34C759;
  --ios-orange: #FF9500;
  --ios-red: #FF3B30;
  --ios-yellow: #FFCC00;
  --ios-purple: #AF52DE;
  --ios-pink: #FF2D55;
  --ios-teal: #5AC8FA;

  /* Grays */
  --ios-gray-1: #8E8E93;
  --ios-gray-2: #AEAEB2;
  --ios-gray-3: #C7C7CC;
  --ios-gray-4: #D1D1D6;
  --ios-gray-5: #E5E5EA;
  --ios-gray-6: #F2F2F7;

  /* Backgrounds */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F2F2F7;
  --bg-tertiary: #FFFFFF;
  --bg-grouped: #F2F2F7;

  /* Text */
  --text-primary: #000000;
  --text-secondary: #3C3C43;
  --text-tertiary: #3C3C4399;
  --text-quaternary: #3C3C434D;

  /* Separators */
  --separator: rgba(60, 60, 67, 0.29);
  --separator-opaque: #C6C6C8;

  /* Fills */
  --fill-primary: rgba(120, 120, 128, 0.2);
  --fill-secondary: rgba(120, 120, 128, 0.16);
  --fill-tertiary: rgba(118, 118, 128, 0.12);

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

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.35s ease;
}

/* ===== Base Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text',
    'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

/* ===== Layout ===== */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Navigation Bar */
.nav-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 0.5px solid var(--separator);
  padding: var(--spacing-sm) var(--spacing-md);
}

.nav-bar-inner {
  width: 100%;
  max-width: none;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 44px;
}

.nav-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
}

.nav-actions {
  display: flex;
  gap: var(--spacing-sm);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  max-width: 100%;
  margin: 0;
  width: 100%;
  padding: var(--spacing-md);
  gap: var(--spacing-md);
}

/* Sidebar */
.sidebar {
  width: 320px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.sidebar-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}

/* Content Area */
.content-area {
  flex: 1;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  padding: var(--spacing-md);
}

/* ===== Cards ===== */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: var(--spacing-md);
  border-bottom: 0.5px solid var(--separator);
}

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

/* Task Card */
.task-card {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.task-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.task-card:active {
  transform: scale(0.98);
}

.task-card.selected {
  border: 2px solid var(--ios-blue);
}

.task-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.task-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
}

.task-status {
  font-size: 12px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.task-status.pending {
  background: var(--ios-gray-5);
  color: var(--ios-gray-1);
}

.task-status.processing {
  background: rgba(0, 122, 255, 0.12);
  color: var(--ios-blue);
}

.task-status.completed {
  background: rgba(52, 199, 89, 0.12);
  color: var(--ios-green);
}

.task-status.failed {
  background: rgba(255, 59, 48, 0.12);
  color: var(--ios-red);
}

.task-status.cancelled {
  background: var(--ios-gray-5);
  color: var(--text-secondary);
}

.task-status.structure_ready {
  background: rgba(52, 199, 89, 0.12);
  color: var(--ios-green);
}

.task-progress {
  margin: var(--spacing-sm) 0;
}

.progress-bar {
  height: 4px;
  background: var(--ios-gray-5);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--ios-blue);
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.progress-fill.completed {
  background: var(--ios-green);
}

.progress-fill.failed {
  background: var(--ios-red);
}

.progress-fill.cancelled {
  background: var(--ios-gray-4);
}

.task-meta {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-tertiary);
}

/* Steps Indicator */
.steps-indicator {
  display: flex;
  gap: var(--spacing-xs);
  margin: var(--spacing-sm) 0;
}

.step-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ios-gray-5);
  transition: all var(--transition-fast);
}

.step-dot.completed {
  background: var(--ios-green);
}

.step-dot.processing {
  background: var(--ios-blue);
  animation: pulse 1.5s infinite;
}

.step-dot.failed {
  background: var(--ios-red);
}

.step-dot.cancelled {
  background: var(--ios-gray-4);
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.2); opacity: 0.7; }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.btn-primary {
  background: var(--ios-blue);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: #0066d6;
}

.btn-primary:active:not(:disabled) {
  background: #0055b3;
}

.btn-secondary {
  background: var(--fill-secondary);
  color: var(--ios-blue);
}

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

.btn-danger {
  background: rgba(255, 59, 48, 0.12);
  color: var(--ios-red);
}

.btn-danger:hover:not(:disabled) {
  background: rgba(255, 59, 48, 0.2);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 50%;
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 17px;
  border-radius: var(--radius-md);
}

/* ===== Upload Zone ===== */
.upload-zone {
  border: 2px dashed var(--ios-gray-4);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--ios-blue);
  background: rgba(0, 122, 255, 0.05);
}

.upload-icon {
  font-size: 48px;
  color: var(--ios-gray-2);
  margin-bottom: var(--spacing-md);
}

.upload-text {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.upload-hint {
  font-size: 13px;
  color: var(--text-tertiary);
}

/* ===== Proofreader ===== */
.proofreader {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: var(--spacing-md);
  height: calc(100vh - 120px);
  width: 100%;
}

.proofreader-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.proofreader-left {
  max-width: 520px;
  min-width: 360px;
  border-right: 0.5px solid var(--separator);
}

.proofreader-right {
  border-left: none;
  min-width: 0;
}

.proofreader.hide-preview {
  grid-template-columns: 1fr;
}

.proofreader.hide-preview .proofreader-left {
  display: none;
}

.panel-header {
  padding: var(--spacing-md);
  border-bottom: 0.5px solid var(--separator);
  background: var(--bg-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.panel-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.panel-body {
  flex: 1;
  overflow: auto;
  padding: var(--spacing-md);
}

/* Image Viewer */
.image-viewer {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  background: var(--ios-gray-6);
  min-height: 100%;
}

.page-image {
  max-width: 100%;
  box-shadow: var(--shadow-lg);
}

/* Content Editor */
.content-editor {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.element-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: var(--spacing-md);
}

.image-element {
  border: 1px solid var(--ios-gray-5);
  background: white;
  box-shadow: var(--shadow-sm);
}

.image-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 999px;
  background: var(--ios-blue);
  color: white;
}

.badge.muted {
  background: var(--ios-gray-4);
  color: var(--text-secondary);
}

.image-preview {
  position: relative;
  background: var(--ios-gray-6);
  border: 1px solid var(--ios-gray-5);
  border-radius: 10px;
  padding: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  overflow: hidden;
}

.image-preview img {
  max-width: 100%;
  max-height: 320px;
  object-fit: contain;
  border-radius: 6px;
  box-shadow: var(--shadow-sm);
}

.image-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.caption-input {
  width: 100%;
  margin-top: 10px;
}

.element-type {
  font-size: 12px;
  font-weight: 500;
  color: var(--ios-blue);
  text-transform: uppercase;
  margin-bottom: var(--spacing-xs);
}

.element-content {
  width: 100%;
  min-height: 80px;
  padding: var(--spacing-sm);
  border: 1px solid var(--ios-gray-4);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
  transition: border-color var(--transition-fast);
}

.element-content:focus {
  outline: none;
  border-color: var(--ios-blue);
}

.panel-tabs {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-md);
  border-bottom: 0.5px solid var(--separator);
  background: var(--bg-secondary);
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.editor-tabs {
  display: inline-flex;
  gap: 8px;
}

.editor-tab {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--ios-gray-5);
  background: var(--bg-primary);
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.editor-tab.active {
  background: var(--ios-blue);
  color: white;
  border-color: var(--ios-blue);
  box-shadow: var(--shadow-sm);
}

.tab-actions {
  display: inline-flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-compact {
  padding: 6px 10px;
  font-size: 13px;
}

.markdown-preview-pane {
  margin-top: var(--spacing-md);
  border: 1px solid var(--ios-gray-5);
  border-radius: var(--radius-sm);
  background: #fff;
  min-height: 200px;
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.markdown-preview-content {
  font-family: Menlo, monospace;
  font-size: 13px;
  white-space: pre-wrap;
  color: var(--text-primary);
}

/* Page Navigation */
.page-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-top: 0.5px solid var(--separator);
  background: var(--bg-primary);
}

.page-indicator {
  font-size: 15px;
  color: var(--text-secondary);
}

/* Thumbnails */
.thumbnails {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  overflow-x: auto;
  background: var(--bg-secondary);
  border-bottom: 0.5px solid var(--separator);
}

.thumbnail {
  position: relative;
  width: 60px;
  height: 80px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.thumbnail:hover {
  border-color: var(--ios-gray-3);
}

.thumbnail.active {
  border-color: var(--ios-blue);
}

.thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.thumbnail-recognition-indicator {
  position: absolute;
  top: 4px;
  left: 4px;
  z-index: 2;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  color: white;
  background: var(--ios-gray-1);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
  user-select: none;
}

.thumbnail-recognition-indicator[data-level='simplified'] {
  background: var(--ios-blue);
}

.thumbnail-recognition-indicator[data-level='medium'] {
  background: var(--ios-purple);
}

.thumbnail-recognition-indicator[data-level='full'] {
  background: var(--ios-green);
}

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

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 15px;
  border: 1px solid var(--ios-gray-4);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--ios-blue);
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  padding: var(--spacing-md);
  border-bottom: 0.5px solid var(--separator);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: 17px;
  font-weight: 600;
}

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

.modal-footer {
  padding: var(--spacing-md);
  border-top: 0.5px solid var(--separator);
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
}

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: var(--spacing-xl);
}

.empty-icon {
  font-size: 64px;
  color: var(--ios-gray-3);
  margin-bottom: var(--spacing-md);
}

.empty-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.empty-text {
  font-size: 15px;
  color: var(--text-tertiary);
  margin-bottom: var(--spacing-lg);
}

/* ===== Loading ===== */
.loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--ios-gray-4);
  border-top-color: var(--ios-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== Toast Notifications ===== */
.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  z-index: 1100;
}

.toast {
  background: var(--text-primary);
  color: white;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  animation: slideIn 0.3s ease;
}

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

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

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

/* ===== Segmented Control ===== */
.segmented-control {
  display: flex;
  background: var(--fill-tertiary);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.segment {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  border-radius: calc(var(--radius-sm) - 2px);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.segment.active {
  background: var(--bg-primary);
  box-shadow: var(--shadow-sm);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .main-content {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
  }

  .proofreader {
    grid-template-columns: 1fr;
    height: auto;
  }

  .proofreader-left {
    max-width: none;
    min-width: 0;
    border-right: none;
    border-bottom: 0.5px solid var(--separator);
  }
}