/**
 * Modern Lesson Edit Modal Styles
 * Design: Facebook-style Two-Column Layout (2024-2025)
 * Based on design screenshot analysis
 */

/* ============================================
   CSS Variables - Design Tokens
   ============================================ */
:root {
  /* Primary Colors */
  --lm-primary: #0066CC;
  --lm-primary-hover: #0052a3;
  --lm-primary-light: #e6f0fa;

  /* Text Colors */
  --lm-text-primary: #1f2937;
  --lm-text-secondary: #374151;
  --lm-text-muted: #6b7280;
  --lm-text-placeholder: #9ca3af;

  /* Backgrounds */
  --lm-bg-white: #ffffff;
  --lm-bg-secondary: #f9fafb;
  --lm-bg-tertiary: #f3f4f6;
  --lm-bg-hover: #e5e7eb;

  /* Borders */
  --lm-border: #d1d5db;
  --lm-border-light: #e5e7eb;

  /* Semantic Colors */
  --lm-success: #22c55e;
  --lm-error: #ef4444;
  --lm-warning: #f59e0b;

  /* Shadows */
  --lm-shadow-modal: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --lm-shadow-card: 0 1px 3px rgba(0, 0, 0, 0.1);
  --lm-shadow-focus: 0 0 0 3px rgba(0, 102, 204, 0.15);

  /* Spacing Scale */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 20px;
  --spacing-2xl: 24px;
  --spacing-3xl: 32px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 16px;

  /* Legacy aliases */
  --modal-text-primary: var(--lm-text-primary);
  --modal-text-secondary: var(--lm-text-secondary);
  --modal-text-tertiary: var(--lm-text-muted);
  --modal-bg-white: var(--lm-bg-white);
  --modal-bg-light: var(--lm-bg-tertiary);
  --modal-bg-hover: var(--lm-bg-hover);
  --modal-border: var(--lm-border-light);
  --modal-border-input: var(--lm-border);
  --modal-accent: var(--lm-primary);
  --modal-accent-hover: var(--lm-primary-hover);
  --modal-accent-light: var(--lm-primary-light);
  --modal-success: var(--lm-success);
  --modal-error: var(--lm-error);
}

/* ============================================
   Modal Container - Two Column Layout
   ============================================ */
.modal.modern-lesson-modal .modal-dialog {
  max-width: 1200px;
  margin: 1.75rem auto;
}

.modal.modern-lesson-modal .modal-content {
  background: var(--lm-bg-white);
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--lm-shadow-modal);
  overflow: hidden;
}

/* Two Column Grid Layout */
.lm-two-column {
  display: grid;
  grid-template-columns: 1fr 450px;
  gap: var(--spacing-3xl);
  align-items: stretch;
}

.lm-form-column {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.lm-sidebar-column {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  height: 100%;
}

/* Section Title in Sidebar */
.lm-section-title {
  font-family: 'Nunito', sans-serif;
  font-size: 14px;
  font-weight: 500;
  color: var(--lm-text-secondary);
  margin-bottom: var(--spacing-md);
}

.lm-section-title .required-star {
  color: var(--lm-error);
  margin-left: 2px;
}

/* Sidebar Section Container */
.lm-sidebar-section {
  margin-bottom: 0;
}

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

/* Sidebar section that should grow to fill space */
.lm-sidebar-section--grow {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.lm-sidebar-section--grow .file-upload-zone {
  flex: 1;
  min-height: 280px;
}

/* Smaller File Upload Zone for Caption */
.file-upload-zone--small {
  padding: 24px 20px;
}

@media (max-width: 1024px) {
  .modal.modern-lesson-modal .modal-dialog {
    max-width: 700px;
  }

  .lm-two-column {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .file-upload-zone {
    min-height: 200px;
    padding: 40px 24px;
  }
}

/* Modal Header */
.modal.modern-lesson-modal .modal-header {
  background: var(--lm-bg-white);
  border-bottom: 1px solid var(--lm-border-light);
  padding: 20px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
}

.modal.modern-lesson-modal .modal-title {
  margin: 0;
  font-family: 'Nunito', sans-serif;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--lm-text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.modal.modern-lesson-modal .modal-title i {
  color: var(--lm-text-secondary);
  font-size: 18px;
}

.modal.modern-lesson-modal .modal-header .close,
.modal.modern-lesson-modal .modal-header .btn-close {
  background: none;
  border: none;
  font-size: 20px;
  color: var(--lm-text-muted);
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.15s ease;
}

.modal.modern-lesson-modal .modal-header .close:hover,
.modal.modern-lesson-modal .modal-header .btn-close:hover {
  color: var(--lm-text-primary);
  background: var(--lm-bg-tertiary);
}

.modal.modern-lesson-modal .modal-header .close:focus,
.modal.modern-lesson-modal .modal-header .btn-close:focus {
  outline: 2px solid var(--lm-primary);
  outline-offset: 2px;
}

/* ============================================
   Action Buttons (Top of Form)
   ============================================ */
.lm-action-buttons {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.lm-btn-primary {
  background: var(--lm-primary);
  color: #fff;
  border: none;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-family: 'Nunito', sans-serif;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.lm-btn-primary:hover {
  background: var(--lm-primary-hover);
}

.lm-btn-primary:focus {
  box-shadow: var(--lm-shadow-focus);
}

.lm-btn-secondary {
  background: var(--lm-bg-white);
  color: var(--lm-text-secondary);
  border: 1px solid var(--lm-border);
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-family: 'Nunito', sans-serif;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.lm-btn-secondary:hover {
  background: var(--lm-bg-tertiary);
}

/* Modal Body */
.modal.modern-lesson-modal .modal-body {
  padding: 24px 32px;
  max-height: 85vh;
  min-height: 500px;
  overflow-y: auto;
  font-size: 14px;
  line-height: 1.6;
  color: var(--lm-text-primary);
  font-family: 'Nunito', sans-serif;
}

/* ============================================
   Inline Form Row (Section + Duration)
   ============================================ */
.lm-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

@media (max-width: 600px) {
  .lm-form-row {
    grid-template-columns: 1fr;
  }
}

/* Scrollbar - Minimal */
.modal.modern-lesson-modal .modal-body::-webkit-scrollbar {
  width: 6px;
}

.modal.modern-lesson-modal .modal-body::-webkit-scrollbar-track {
  background: transparent;
}

.modal.modern-lesson-modal .modal-body::-webkit-scrollbar-thumb {
  background: var(--modal-border);
  border-radius: 3px;
}

.modal.modern-lesson-modal .modal-body::-webkit-scrollbar-thumb:hover {
  background: var(--modal-text-tertiary);
}

/* ============================================
   Lesson Type Badge - Simple Tag (code.html style)
   ============================================ */
.lesson-type-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 6px 12px;
  background: var(--lm-bg-tertiary);
  border: 1px solid var(--lm-border-light);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--lm-text-muted);
  margin-bottom: var(--spacing-md);
}

.lesson-type-badge i {
  font-size: 14px;
  color: var(--lm-text-muted);
}

.lesson-type-badge .badge-text {
  font-weight: 700;
  color: var(--lm-text-primary);
  margin-left: 4px;
}

.lesson-type-badge .change-type-link {
  margin-left: auto;
  color: var(--lm-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
}

.lesson-type-badge .change-type-link:hover {
  color: var(--lm-primary-hover);
  text-decoration: underline;
}

/* ============================================
   Form Groups
   ============================================ */
.modern-form-group {
  margin-bottom: var(--spacing-lg);
}

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

.modern-form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--modal-text-primary);
  margin-bottom: var(--spacing-sm);
}

.modern-form-label i {
  display: none;
}

.modern-form-label .required-star {
  color: var(--modal-error);
  margin-left: 2px;
}

/* ============================================
   Input Fields
   ============================================ */
.modern-input {
  width: 100%;
  padding: 10px 14px;
  font-size: 15px;
  font-family: 'Nunito', sans-serif;
  color: var(--lm-text-primary);
  background: var(--lm-bg-white);
  border: 1px solid var(--lm-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all 0.15s ease;
  min-height: 42px;
}

.modern-input::placeholder {
  color: var(--lm-text-placeholder);
}

.modern-input:hover {
  border-color: #9ca3af;
}

.modern-input:focus {
  border-color: var(--lm-primary);
  box-shadow: var(--lm-shadow-focus);
}

.modern-input:disabled {
  background: var(--lm-bg-tertiary);
  color: var(--lm-text-muted);
  cursor: not-allowed;
  opacity: 0.7;
}

/* Select Dropdown */
.modern-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 40px;
  cursor: pointer;
}

/* Textarea */
.modern-textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.6;
}

/* ============================================
   File Upload Zone
   ============================================ */
.modern-file-upload {
  position: relative;
}

.file-upload-zone {
  border: 2px dashed var(--lm-border);
  border-radius: var(--radius-md);
  padding: 60px 32px;
  text-align: center;
  cursor: pointer;
  background: var(--lm-bg-white);
  transition: all 0.15s ease;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.file-upload-zone:hover {
  border-color: var(--lm-primary);
  background: var(--lm-primary-light);
}

.file-upload-zone.dragover {
  border-color: var(--lm-primary);
  background: var(--lm-primary-light);
}

.file-upload-zone input[type="file"] {
  display: none;
}

.file-upload-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-md);
  color: var(--lm-text-muted);
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--lm-bg-hover);
  border-radius: var(--radius-lg);
  transition: transform 0.15s ease;
}

.file-upload-zone:hover .file-upload-icon {
  transform: scale(1.1);
}

.file-upload-text {
  font-size: 14px;
  color: var(--lm-text-muted);
  margin-bottom: var(--spacing-sm);
}

.file-upload-text span {
  color: var(--lm-primary);
  font-weight: 500;
  cursor: pointer;
}

.file-upload-text span:hover {
  text-decoration: underline;
}

.file-upload-hint {
  font-size: 12px;
  color: var(--lm-text-muted);
  margin-bottom: var(--spacing-md);
}

/* File Size Badges */
.file-size-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  justify-content: center;
}

.size-badge {
  padding: 4px 10px;
  font-size: 11px;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--lm-bg-tertiary);
  border: 1px solid var(--lm-border-light);
  color: var(--lm-text-muted);
}

.size-badge.primary {
  background: var(--lm-bg-tertiary);
  color: var(--lm-text-muted);
}

/* Current Video Display Card */
.current-video-display {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--lm-bg-secondary);
  border: 1px solid var(--lm-border-light);
  border-radius: var(--radius-lg);
}

.current-video-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  flex: 1;
  min-width: 0;
}

.video-icon-wrapper {
  width: 48px;
  height: 48px;
  background: var(--lm-bg-hover);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--lm-text-muted);
  font-size: 24px;
  flex-shrink: 0;
}

.video-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.video-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--lm-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.video-status {
  font-size: 12px;
  color: var(--lm-success);
  display: flex;
  align-items: center;
  gap: 4px;
}

.video-status i {
  font-size: 14px;
}

.download-btn {
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--lm-primary);
  border-radius: var(--radius-sm);
  color: var(--lm-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  white-space: nowrap;
}

.download-btn:hover {
  background: rgba(0, 102, 204, 0.05);
}

.download-btn:focus {
  outline: 2px solid var(--lm-primary);
  outline-offset: 2px;
}

.download-btn i {
  font-size: 14px;
}

/* ============================================
   Duration Picker
   ============================================ */
.duration-input-wrapper {
  position: relative;
}

.duration-input-wrapper .modern-input {
  padding-left: 36px;
}

.duration-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--modal-text-tertiary);
  font-size: 16px;
  pointer-events: none;
}

/* ============================================
   Checkbox Options - Card Style (code.html)
   ============================================ */
.checkbox-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  padding-top: var(--spacing-lg);
}

@media (max-width: 600px) {
  .checkbox-options {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
}

.modern-checkbox {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  padding: 12px;
  background: var(--lm-bg-secondary);
  border: 1px solid var(--lm-border-light);
  border-radius: var(--radius-md);
  transition: all 0.15s ease;
}

.modern-checkbox:hover {
  background: var(--lm-bg-tertiary);
}

.modern-checkbox:hover .checkbox-custom {
  border-color: var(--lm-primary);
}

.modern-checkbox input[type="checkbox"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.checkbox-custom {
  width: 20px;
  height: 20px;
  border: 2px solid var(--lm-border);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: var(--lm-bg-white);
  transition: all 0.15s ease;
}

.checkbox-custom i {
  font-size: 12px;
  color: #fff;
  opacity: 0;
  transform: scale(0.5);
  transition: all 0.15s ease;
}

.modern-checkbox.checked .checkbox-custom {
  background: var(--lm-primary);
  border-color: var(--lm-primary);
}

.modern-checkbox.checked .checkbox-custom i {
  opacity: 1;
  transform: scale(1);
}

.checkbox-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--lm-text-secondary);
}

/* ============================================
   Submit Button - Clean Primary Button
   ============================================ */
.modern-submit-btn {
  width: 100%;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--modal-bg-white);
  background: var(--modal-accent);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.modern-submit-btn:hover {
  background: var(--modal-accent-hover);
}

.modern-submit-btn:focus {
  outline: 2px solid var(--modal-accent);
  outline-offset: 2px;
}

.modern-submit-btn:active {
  background: #003d7a;
}

.modern-submit-btn:disabled {
  background: var(--modal-border-input);
  cursor: not-allowed;
}

.modern-submit-btn i {
  font-size: 16px;
}

/* Upload Progress */
.upload-progress {
  display: none;
  align-items: center;
  gap: var(--spacing-sm);
}

.upload-progress.active {
  display: flex;
}

.progress-bar-wrapper {
  flex: 1;
  height: 4px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--modal-bg-white);
  border-radius: 2px;
  width: 0%;
  transition: width 0.2s ease;
}

.progress-text {
  font-size: 12px;
  font-weight: 500;
  color: var(--modal-bg-white);
  min-width: 40px;
  text-align: right;
}

/* ============================================
   Summernote Editor Override
   ============================================ */
.modern-lesson-modal .note-editor.note-frame,
.lm-editor-container .note-editor.note-frame {
  border: 1px solid var(--lm-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.modern-lesson-modal .note-editor.note-frame:focus-within,
.lm-editor-container .note-editor.note-frame:focus-within {
  border-color: var(--lm-primary);
  box-shadow: var(--lm-shadow-focus);
}

.modern-lesson-modal .note-toolbar,
.lm-editor-container .note-toolbar {
  background: var(--lm-bg-secondary);
  border-bottom: 1px solid var(--lm-border-light);
  padding: var(--spacing-sm) var(--spacing-md);
}

.modern-lesson-modal .note-btn,
.lm-editor-container .note-btn {
  background: transparent !important;
  border: none !important;
  color: var(--lm-text-muted) !important;
  border-radius: 4px !important;
  padding: 6px !important;
  transition: all 0.15s ease !important;
}

.modern-lesson-modal .note-btn:hover,
.lm-editor-container .note-btn:hover {
  background: var(--lm-bg-hover) !important;
  color: var(--lm-text-primary) !important;
}

.modern-lesson-modal .note-btn.active,
.lm-editor-container .note-btn.active {
  background: var(--lm-bg-tertiary) !important;
  color: var(--lm-primary) !important;
}

.modern-lesson-modal .note-editing-area,
.lm-editor-container .note-editing-area {
  background: var(--lm-bg-white);
}

.modern-lesson-modal .note-editable,
.lm-editor-container .note-editable {
  padding: var(--spacing-lg);
  min-height: 150px;
  font-family: 'Nunito', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--lm-text-primary);
}

.modern-lesson-modal .note-editable[data-placeholder]:empty::before,
.lm-editor-container .note-editable[data-placeholder]:empty::before {
  color: var(--lm-text-placeholder);
  font-style: italic;
}

/* ============================================
   Select2 Override
   ============================================ */
.modern-lesson-modal .select2-container--default .select2-selection--single {
  height: 40px;
  border: 1px solid var(--modal-border-input);
  border-radius: var(--radius-sm);
  background: var(--modal-bg-white);
  transition: border-color 0.2s ease;
}

.modern-lesson-modal .select2-container--default .select2-selection--single:hover {
  border-color: #999999;
}

.modern-lesson-modal .select2-container--default.select2-container--focus .select2-selection--single,
.modern-lesson-modal .select2-container--default.select2-container--open .select2-selection--single {
  border-color: var(--modal-accent);
  box-shadow: 0 0 0 3px var(--modal-accent-light);
}

.modern-lesson-modal .select2-container--default .select2-selection--single .select2-selection__rendered {
  line-height: 38px;
  padding-left: 12px;
  color: var(--modal-text-primary);
}

.modern-lesson-modal .select2-container--default .select2-selection--single .select2-selection__arrow {
  height: 38px;
  right: 8px;
}

/* ============================================
   Animation Classes - Removed for Minimal
   ============================================ */
.fade-in-up {
  /* No animation - clean and functional */
}

.stagger-1, .stagger-2, .stagger-3,
.stagger-4, .stagger-5, .stagger-6, .stagger-7 {
  /* No stagger delays */
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 600px) {
  .modal.modern-lesson-modal .modal-dialog {
    margin: 0.5rem;
    width: calc(100% - 1rem);
  }

  .modal.modern-lesson-modal .modal-header,
  .modal.modern-lesson-modal .modal-body {
    padding: var(--spacing-lg);
  }

  .file-upload-zone {
    padding: var(--spacing-lg);
  }

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

  .current-video-display {
    flex-direction: column;
    text-align: center;
  }

  .download-btn {
    width: 100%;
    justify-content: center;
  }

  /* Touch target minimum 44px */
  .modern-submit-btn,
  .download-btn {
    min-height: 44px;
  }

  /* Prevent zoom on iOS */
  .modern-input,
  .modern-textarea,
  .modern-select {
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .modal.modern-lesson-modal .modal-content {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }

  .modal.modern-lesson-modal .modal-dialog {
    margin: 0;
    width: 100%;
    max-width: 100%;
    position: fixed;
    bottom: 0;
    top: auto;
  }
}