/* ===========================================
   MontageFacile - Feuille de style principale
   Application de montage vidéo pour élèves
   =========================================== */

/* -----------------------------------------
   Variables CSS - Thème et couleurs
   ----------------------------------------- */
:root {
    /* Couleurs principales - Palette douce et pédagogique */
    --color-primary: #6366f1;           /* Indigo - Actions principales */
    --color-primary-hover: #4f46e5;
    --color-primary-light: #e0e7ff;
    --color-secondary: #64748b;         /* Gris bleu - Actions secondaires */
    --color-secondary-hover: #475569;
    
    /* Couleurs d'état */
    --color-success: #22c55e;           /* Vert - Succès */
    --color-success-light: #dcfce7;
    --color-warning: #f59e0b;           /* Orange - Attention */
    --color-warning-light: #fef3c7;
    --color-error: #ef4444;             /* Rouge - Erreur */
    --color-error-light: #fee2e2;
    --color-info: #3b82f6;              /* Bleu - Information */
    --color-info-light: #dbeafe;
    
    /* Couleurs de fond */
    --bg-primary: #f8fafc;              /* Fond principal */
    --bg-secondary: #ffffff;            /* Cartes et sections */
    --bg-tertiary: #f1f5f9;             /* Zones interactives */
    --bg-dark: #1e293b;                 /* Éléments sombres */
    
    /* Couleurs de texte */
    --text-primary: #1e293b;            /* Texte principal */
    --text-secondary: #64748b;          /* Texte secondaire */
    --text-muted: #94a3b8;              /* Texte discret */
    --text-inverse: #ffffff;            /* Texte sur fond sombre */
    
    /* Bordures */
    --border-color: #e2e8f0;
    --border-color-focus: #6366f1;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Rayons de bordure */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Espacement */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Typographie */
    --font-primary: 'Nunito', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Z-index */
    --z-dropdown: 100;
    --z-modal: 1000;
    --z-notification: 1100;
}

/* -----------------------------------------
   Reset et styles de base
   ----------------------------------------- */
*, *::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: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* Focus visible pour accessibilité */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Sélection de texte */
::selection {
    background: var(--color-primary-light);
    color: var(--text-primary);
}

/* -----------------------------------------
   Typographie
   ----------------------------------------- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.125rem; }

p {
    margin-bottom: var(--space-md);
}

p:last-child {
    margin-bottom: 0;
}

/* -----------------------------------------
   Boutons
   ----------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    font-weight: 600;
    line-height: 1.5;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.btn svg {
    flex-shrink: 0;
}

/* Bouton principal */
.btn-primary {
    background: var(--color-primary);
    color: var(--text-inverse);
    border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

/* Bouton secondaire */
.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--border-color);
    border-color: var(--text-secondary);
}

/* Bouton outline */
.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-outline:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

/* Bouton icône seule */
.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Bouton de contrôle vidéo */
.btn-control {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-inverse);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-control:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Bouton de fermeture */
.btn-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* -----------------------------------------
   Layout principal de l'application
   ----------------------------------------- */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--space-md);
}

/* En-tête */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
    box-shadow: var(--shadow-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    font-size: 2rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    gap: var(--space-sm);
}

/* Contenu principal */
.main-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--space-md);
    flex: 1;
}

/* Sections */
section {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.section-title svg {
    color: var(--color-primary);
}

/* -----------------------------------------
   Zone d'import (Zone 1)
   ----------------------------------------- */
.section-import {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.drop-zone {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    padding: var(--space-xl);
    background: var(--bg-tertiary);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.drop-zone.drag-over {
    transform: scale(1.02);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.drop-icon {
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
    transition: all var(--transition-normal);
}

.drop-zone:hover .drop-icon,
.drop-zone.drag-over .drop-icon {
    color: var(--color-primary);
    transform: translateY(-4px);
}

.drop-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.drop-subtext {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.drop-formats {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--space-sm);
}

.import-actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.import-actions .btn {
    width: 100%;
    justify-content: flex-start;
}

/* -----------------------------------------
   Zone éditeur (Zone 2 & 3)
   ----------------------------------------- */
.section-editor {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

/* Informations vidéo */
.video-info {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.info-item svg {
    color: var(--text-muted);
}

/* Conteneur vidéo */
.video-container {
    position: relative;
    background: var(--bg-dark);
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 16 / 9;
}

.video-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    color: var(--text-muted);
}

.video-placeholder svg {
    opacity: 0.3;
}

.video-placeholder p {
    font-size: 1rem;
    opacity: 0.7;
}

.preview-video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #000;
}

/* -----------------------------------------
   Modals
   ----------------------------------------- */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal:not(.hidden) {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.modal:not(.hidden) .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.modal-header h2 {
    font-size: 1.25rem;
}

/* Modal d'export */
.export-modal-content {
    text-align: center;
}

.export-modal-content h2 {
    margin-bottom: var(--space-lg);
}

.export-progress {
    margin-bottom: var(--space-lg);
}

.progress-bar {
    height: 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: var(--space-md);
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-primary), #8b5cf6);
    border-radius: 6px;
    transition: width var(--transition-normal);
}

#export-status {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--space-xs);
}

#export-percent {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

/* Liste des raccourcis */
.shortcuts-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.shortcut-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.shortcut-item span {
    color: var(--text-secondary);
}

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 28px;
    padding: 0 var(--space-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 0 var(--border-color);
}

/* -----------------------------------------
   Tutorial / Onboarding
   ----------------------------------------- */
.tutorial-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: var(--z-modal);
}

.tutorial-modal {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    max-width: 600px;
    width: 90%;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.4s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tutorial-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.tutorial-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--space-md);
}

.tutorial-header h1 {
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--color-primary), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tutorial-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.tutorial-step {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.step-number {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: var(--text-inverse);
    font-weight: 700;
    border-radius: 50%;
}

.step-content h3 {
    font-size: 1rem;
    margin-bottom: var(--space-xs);
}

.step-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.tutorial-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.tutorial-checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.tutorial-checkbox input {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
}

/* -----------------------------------------
   Notifications
   ----------------------------------------- */
.notifications {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    z-index: var(--z-notification);
    pointer-events: none;
}

.notification {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    pointer-events: auto;
    max-width: 400px;
}

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

.notification.fade-out {
    animation: slideOut 0.3s ease forwards;
}

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

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

.notification.success .notification-icon {
    background: var(--color-success-light);
    color: var(--color-success);
}

.notification.error .notification-icon {
    background: var(--color-error-light);
    color: var(--color-error);
}

.notification.warning .notification-icon {
    background: var(--color-warning-light);
    color: var(--color-warning);
}

.notification.info .notification-icon {
    background: var(--color-info-light);
    color: var(--color-info);
}

.notification-content {
    flex: 1;
}

.notification-title {
    font-weight: 600;
    font-size: 0.875rem;
}

.notification-message {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

/* -----------------------------------------
   États et utilitaires
   ----------------------------------------- */
.hidden {
    display: none !important;
}

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

/* -----------------------------------------
   Responsive Design - Tablettes
   ----------------------------------------- */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .section-import {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .drop-zone {
        flex: 1;
        min-width: 250px;
        min-height: 150px;
    }
    
    .import-actions {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .import-actions .btn {
        width: auto;
        flex: 1;
        min-width: 120px;
    }
}

@media (max-width: 768px) {
    :root {
        --space-lg: 16px;
        --space-xl: 24px;
    }
    
    .app-container {
        padding: var(--space-sm);
    }
    
    .app-header {
        padding: var(--space-md);
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .section-import {
        flex-direction: column;
    }
    
    .import-actions {
        flex-direction: column;
    }
    
    .import-actions .btn {
        width: 100%;
    }
    
    .tutorial-modal {
        padding: var(--space-lg);
    }
    
    .notifications {
        left: var(--space-md);
        right: var(--space-md);
        bottom: var(--space-md);
    }
    
    .notification {
        max-width: none;
    }
}

/* -----------------------------------------
   Animations globales
   ----------------------------------------- */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Préférence pour les mouvements réduits */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* -----------------------------------------
   Bouton de prévisualisation du montage
   ----------------------------------------- */
.btn-preview-montage {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    background: var(--bg-secondary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-preview-montage:hover:not(:disabled) {
    background: var(--color-primary-light);
    transform: translateY(-2px);
}

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

.section-export {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* -----------------------------------------
   Modal de prévisualisation
   ----------------------------------------- */
.preview-modal-content {
    max-width: 900px;
    width: 95%;
    padding: 0;
    overflow: hidden;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.preview-header h2 {
    margin: 0;
    font-size: 1.25rem;
}

.preview-canvas-container {
    position: relative;
    width: 100%;
    background: #000;
    aspect-ratio: 16 / 9;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.preview-controls {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

.btn-play-preview {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-play-preview:hover {
    background: var(--color-primary-hover);
    transform: scale(1.05);
}

.preview-progress-bar {
    flex: 1;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    overflow: hidden;
}

.preview-progress-bar .progress-fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: 4px;
    transition: width 0.1s linear;
}

.preview-time {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.preview-time-separator {
    color: var(--text-muted);
}

/* -----------------------------------------
   Modal d'édition de texte
   ----------------------------------------- */
.text-overlay-modal-content {
    max-width: 600px;
    width: 95%;
}

.text-overlay-form {
    padding: var(--space-lg);
}

.form-row {
    margin-bottom: var(--space-lg);
}

.form-row label {
    display: block;
    margin-bottom: var(--space-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.form-row textarea,
.form-row input[type="text"],
.form-row input[type="number"],
.form-row select {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-size: 1rem;
    font-family: var(--font-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    transition: border-color var(--transition-fast);
}

.form-row textarea:focus,
.form-row input:focus,
.form-row select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-row textarea {
    resize: vertical;
    min-height: 60px;
}

.form-row input[type="color"] {
    width: 50px;
    height: 40px;
    padding: 2px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.form-row input[type="range"] {
    width: 100%;
    cursor: pointer;
}

.form-row-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 0.875rem;
}

.text-preview-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.text-preview-video-placeholder {
    position: absolute;
    inset: 0;
    background: 
        linear-gradient(45deg, #374151 25%, transparent 25%),
        linear-gradient(-45deg, #374151 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #374151 75%),
        linear-gradient(-45deg, transparent 75%, #374151 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    opacity: 0.3;
}

.text-overlay-preview-text {
    position: absolute;
    white-space: pre-wrap;
    word-break: break-word;
    max-width: 90%;
    z-index: 1;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

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

.btn-danger:hover {
    background: var(--color-error);
    color: white;
}

/* -----------------------------------------
   Modal de configuration des transitions
   ----------------------------------------- */
.transition-modal-content {
    max-width: 500px;
    width: 95%;
}

.transition-form {
    padding: var(--space-lg);
}

.transition-preview {
    width: 100%;
    padding: var(--space-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    text-align: center;
}

.transition-preview-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}

.transition-preview-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.transition-preview-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.transition-preview-animation {
    position: relative;
    width: 200px;
    height: 60px;
    margin: 0 auto;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: #1e293b;
}

.preview-clip {
    position: absolute;
    width: 50%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: white;
}

.preview-clip.clip-a {
    left: 0;
    background: var(--color-primary);
}

.preview-clip.clip-b {
    right: 0;
    background: var(--color-success);
}

/* Animations de prévisualisation des transitions */
.transition-preview-animation.playing .clip-a {
    animation: clipAOut 2s ease-in-out infinite;
}

.transition-preview-animation.playing .clip-b {
    animation: clipBIn 2s ease-in-out infinite;
}

.transition-preview-animation.fade.playing .clip-a {
    animation: fadeOut 2s ease-in-out infinite;
}

.transition-preview-animation.fade.playing .clip-b {
    animation: fadeIn 2s ease-in-out infinite;
}

.transition-preview-animation.crossfade.playing .clip-a {
    animation: crossfadeOut 2s ease-in-out infinite;
}

.transition-preview-animation.crossfade.playing .clip-b {
    animation: crossfadeIn 2s ease-in-out infinite;
}

.transition-preview-animation.wipe-left.playing .clip-b {
    animation: wipeLeft 2s ease-in-out infinite;
}

.transition-preview-animation.wipe-right.playing .clip-b {
    animation: wipeRight 2s ease-in-out infinite;
}

.transition-preview-animation.zoom-in.playing .clip-a {
    animation: zoomIn 2s ease-in-out infinite;
}

.transition-preview-animation.zoom-out.playing .clip-b {
    animation: zoomOut 2s ease-in-out infinite;
}

@keyframes fadeOut {
    0%, 40% { opacity: 1; }
    60%, 100% { opacity: 0; }
}

@keyframes fadeIn {
    0%, 40% { opacity: 0; }
    60%, 100% { opacity: 1; }
}

@keyframes crossfadeOut {
    0% { opacity: 1; z-index: 1; }
    100% { opacity: 0; z-index: 1; }
}

@keyframes crossfadeIn {
    0% { opacity: 0; z-index: 2; width: 100%; left: 0; }
    100% { opacity: 1; z-index: 2; width: 100%; left: 0; }
}

@keyframes wipeLeft {
    0% { width: 0; left: 0; }
    100% { width: 100%; left: 0; }
}

@keyframes wipeRight {
    0% { width: 0; right: 0; left: auto; }
    100% { width: 100%; right: 0; left: auto; }
}

@keyframes zoomIn {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(1.5); opacity: 0; }
}

@keyframes zoomOut {
    0% { transform: scale(0.5); opacity: 0; width: 100%; left: 0; }
    100% { transform: scale(1); opacity: 1; width: 100%; left: 0; }
}

@keyframes clipAOut {
    0%, 30% { transform: translateX(0); }
    70%, 100% { transform: translateX(-100%); }
}

@keyframes clipBIn {
    0%, 30% { transform: translateX(0); }
    70%, 100% { transform: translateX(-100%); }
}

/* -----------------------------------------
   Boutons sur les clips (texte, transition)
   ----------------------------------------- */
.clip-actions {
    position: absolute;
    top: var(--space-xs);
    right: var(--space-xs);
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.timeline-clip:hover .clip-actions {
    opacity: 1;
}

.clip-action-btn {
    width: 24px;
    height: 24px;
    padding: 0;
    border: none;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.clip-action-btn:hover {
    background: var(--color-primary);
    color: white;
}

.clip-action-btn svg {
    width: 14px;
    height: 14px;
}

/* Indicateur de transition entre clips */
.transition-indicator {
    position: absolute;
    right: -16px;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background: var(--bg-secondary);
    border: 2px solid var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.transition-indicator:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-50%) scale(1.1);
}

.transition-indicator.has-transition {
    background: var(--color-primary);
    color: white;
}

/* Indicateur de texte sur le clip */
.clip-text-indicator {
    position: absolute;
    bottom: var(--space-xs);
    left: var(--space-xs);
    padding: 2px 6px;
    background: rgba(99, 102, 241, 0.9);
    color: white;
    font-size: 10px;
    font-weight: 600;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.clip-text-indicator svg {
    width: 10px;
    height: 10px;
}

.clip-source-badge {
    position: absolute;
    top: var(--space-xs);
    left: var(--space-xs);
    padding: 2px 6px;
    background: rgba(0, 0, 0, 0.75);
    color: white;
    font-size: 9px;
    font-weight: 500;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 3px;
    max-width: calc(100% - 40px);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

.timeline-clip:hover .clip-source-badge {
    opacity: 1;
}

.clip-source-badge svg {
    flex-shrink: 0;
}

/* -----------------------------------------
   Responsive pour les nouvelles modales
   ----------------------------------------- */
@media (max-width: 768px) {
    .form-row-grid {
        grid-template-columns: 1fr;
    }
    
    .preview-modal-content {
        max-width: 100%;
        margin: var(--space-sm);
        border-radius: var(--radius-md);
    }
    
    .preview-controls {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .preview-progress-bar {
        order: -1;
        width: 100%;
        flex: none;
    }
    
    .section-export {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn-preview-montage,
    .btn-export {
        width: 100%;
        justify-content: center;
    }
}