/* MassForge-PDF Web Edition - Design System */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Light Theme Color Palette */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --sidebar-bg: #1e293b;
  --sidebar-text: #e2e8f0;
  --sidebar-hover: #334155;
  --sidebar-active: #2563eb;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --accent-primary: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #dbeafe;
  --accent-text: #1e40af;
  
  --danger-color: #ef4444;
  --danger-hover: #dc2626;
  --success-color: #10b981;

  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --card-hover-bg: #f8fafc;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --card-hover-shadow: 0 10px 15px -3px rgba(37, 99, 235, 0.1), 0 4px 6px -2px rgba(37, 99, 235, 0.05);

  --modal-overlay: rgba(15, 23, 42, 0.6);
  --modal-bg: #ffffff;
  --input-bg: #f8fafc;
  --input-border: #cbd5e1;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

[data-theme="dark"] {
  /* Dark Theme Color Palette */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --sidebar-bg: #090d16;
  --sidebar-text: #cbd5e1;
  --sidebar-hover: #1e293b;
  --sidebar-active: #3b82f6;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;

  --accent-primary: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-light: rgba(59, 130, 246, 0.15);
  --accent-text: #93c5fd;

  --card-bg: #1e293b;
  --card-border: #334155;
  --card-hover-bg: #24334a;
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --card-hover-shadow: 0 10px 25px -3px rgba(59, 130, 246, 0.25);

  --modal-overlay: rgba(0, 0, 0, 0.75);
  --modal-bg: #1e293b;
  --input-bg: #0f172a;
  --input-border: #334155;
}

/* Reset & Global Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  overflow: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* App Container Layout */
#app {
  display: flex;
  width: 100vw;
  height: 100vh;
}

/* Sidebar Styling */
.sidebar {
  width: 260px;
  background-color: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  user-select: none;
  z-index: 10;
}

.sidebar-header {
  padding: 30px 24px 20px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.sidebar-logo {
  width: 80px;
  height: 80px;
  object-fit: contain;
  margin-bottom: 12px;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
}

.sidebar-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.02em;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px;
  flex-grow: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  color: var(--sidebar-text);
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-item:hover {
  background-color: var(--sidebar-hover);
  color: #ffffff;
}

.nav-item.active {
  background-color: var(--sidebar-active);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.nav-icon {
  font-size: 1.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.sidebar-footer {
  padding: 20px;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-footer a {
  color: #60a5fa;
  text-decoration: underline;
  cursor: pointer;
}

.sidebar-footer a:hover {
  color: #93c5fd;
}

/* Main Content Area */
.main-wrapper {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* Header Top Controls */
.top-header {
  height: 64px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  flex-shrink: 0;
}

.header-title-area h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.icon-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: var(--accent-light);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.lang-select {
  background: var(--bg-tertiary);
  border: 1px solid var(--card-border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  outline: none;
}

/* Views & Dashboard Tiles */
.content-scroll {
  flex-grow: 1;
  overflow-y: auto;
  padding: 32px;
}

.view-section {
  display: none;
  animation: fadeIn 0.25s ease-in-out;
}

.view-section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-header {
  margin-bottom: 24px;
}

.section-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

/* Tool Cards (CustomTkinter aesthetics) */
.tool-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  box-shadow: var(--card-shadow);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  box-shadow: var(--card-hover-shadow);
  background-color: var(--card-hover-bg);
}

.tool-card-icon {
  width: 90px;
  height: 90px;
  object-fit: contain;
  margin-bottom: 16px;
  transition: transform var(--transition-normal);
}

.tool-card:hover .tool-card-icon {
  transform: scale(1.08);
}

.tool-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.tool-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Modal Workspace Dialogs */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--modal-overlay);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

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

.modal-dialog {
  background-color: var(--modal-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 680px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
  transform: scale(0.95);
  transition: transform 0.25s ease;
  overflow: hidden;
}

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

.modal-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-secondary);
}

.modal-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--danger-color);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  background-color: var(--bg-secondary);
}

/* Input Components & Forms */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

.input-control {
  width: 100%;
  padding: 10px 14px;
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.input-control:focus {
  border-color: var(--accent-primary);
}

.input-control[readonly] {
  background-color: var(--bg-tertiary);
  cursor: not-allowed;
}

.input-file-group {
  display: flex;
  gap: 10px;
}

/* File Drop Zone */
.dropzone {
  border: 2px dashed var(--input-border);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  background-color: var(--bg-tertiary);
  transition: all var(--transition-fast);
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent-primary);
  background-color: var(--accent-light);
}

.dropzone-icon {
  font-size: 2rem;
  color: var(--accent-primary);
  margin-bottom: 8px;
}

.dropzone-text {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* Reorderable Item List (Merge & Images to PDF) */
.item-list-container {
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  background: var(--input-bg);
}

.item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-bottom: 1px solid var(--card-border);
  background: var(--bg-secondary);
}

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

.item-handle {
  cursor: grab;
  color: var(--text-muted);
  font-weight: bold;
  padding: 4px 8px;
}

.item-name {
  flex-grow: 1;
  font-size: 0.88rem;
  color: var(--accent-primary);
  text-decoration: underline;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 0 8px;
}

.item-actions {
  display: flex;
  gap: 4px;
}

.btn-small {
  padding: 4px 8px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--card-border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
}

.btn-small:hover {
  background: var(--accent-light);
  color: var(--accent-primary);
}

.btn-small.btn-danger {
  color: var(--danger-color);
}

.btn-small.btn-danger:hover {
  background: rgba(239, 68, 68, 0.15);
}

/* 3x3 Position Radio Grid (Add Page Numbers) */
.position-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  width: 140px;
  margin-top: 4px;
}

.position-radio {
  display: flex;
  align-items: center;
  justify-content: center;
}

.position-radio input[type="radio"] {
  appearance: none;
  width: 28px;
  height: 28px;
  border: 2px solid var(--input-border);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.position-radio input[type="radio"]:checked {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.position-radio input[type="radio"]:checked::after {
  content: '';
  width: 8px;
  height: 8px;
  background: #ffffff;
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* Thumbnail Boundary Preview Container */
.preview-boundary-panel {
  display: flex;
  align-items: center;
  gap: 12px;
  overflow-x: auto;
  padding: 12px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  min-height: 120px;
}

.thumb-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.thumb-card span {
  font-size: 0.75rem;
  font-style: italic;
  color: var(--text-secondary);
}

.thumb-card canvas, .thumb-card img {
  border: 1px solid var(--card-border);
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  cursor: pointer;
}

.thumb-dots {
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--text-muted);
}

/* Progress Bar & Status */
.progress-bar-container {
  width: 100%;
  height: 8px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  display: none;
}

.progress-bar-container.active {
  display: block;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-hover));
  transition: width 0.2s ease;
}

/* Buttons */
.btn {
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

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

.btn-secondary:hover {
  background-color: var(--card-border);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

/* Toast Notifications */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 200;
}

.toast {
  padding: 14px 20px;
  border-radius: var(--radius-md);
  background: var(--sidebar-bg);
  color: #ffffff;
  font-size: 0.88rem;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn 0.3s ease;
}

.toast.success { border-left: 4px solid var(--success-color); }
.toast.error { border-left: 4px solid var(--danger-color); }
.toast.warning { border-left: 4px solid #f59e0b; }

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

/* Full Preview Modal Image Container */
.full-preview-img {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}