/* Reset et base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --primary-dark: #5a6fd8;
    --secondary-color: #764ba2;
    --accent-color: #28a745;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-color);
}

/* Layout principal */
#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    margin: 0;
}

.tagline {
    font-size: 0.9rem;
    opacity: 0.9;
    display: block;
    margin-top: 0.25rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-input {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--border-radius);
    background: rgba(255,255,255,0.2);
    color: white;
    placeholder-color: rgba(255,255,255,0.7);
    transition: var(--transition);
    width: 250px;
}

.search-input:focus {
    outline: none;
    background: rgba(255,255,255,0.3);
}

.search-input::placeholder {
    color: rgba(255,255,255,0.7);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* Layout principal */
.main-layout {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Sidebar */
.sidebar {
    background: var(--bg-light);
    border-right: 1px solid var(--border-color);
    transition: var(--transition);
}

.sidebar-content {
    padding: 1.5rem;
    height: 100%;
}

/* Navigation */
.nav-section {
    margin-bottom: 2rem;
}

.nav-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.back-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--primary-dark);
}

.nav-section h3 {
    color: var(--text-color);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

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

.nav-item {
    margin-bottom: 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    color: var(--text-light);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-size: 0.95rem;
}

.nav-link:hover {
    background: var(--bg-color);
    color: var(--text-color);
}

.nav-link.active {
    background: var(--primary-color);
    color: white;
}

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

.nav-link.disabled:hover {
    background: none;
    color: var(--text-light);
}

.course-number {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    min-width: 2rem;
    text-align: center;
    margin-right: 0.75rem;
}

.course-count,
.course-duration {
    font-size: 0.8rem;
    color: var(--text-light);
    background: var(--bg-color);
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
}

/* Contenu principal */
.content {
    position: relative;
    padding: 2rem;
    overflow-y: auto;
}

/* Markdown viewer */
.markdown-viewer {
    max-width: 900px;
    margin: 4rem auto 0 auto;
}

.markdown-viewer h1 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.markdown-viewer h2 {
    color: var(--text-color);
    margin: 2rem 0 1rem 0;
}

.markdown-viewer h3 {
    color: var(--text-color);
    margin: 1.5rem 0 0.75rem 0;
}

.markdown-viewer p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.markdown-viewer ul, .markdown-viewer ol {
    margin-bottom: 1rem;
    padding-left: 2rem;
}

.markdown-viewer li {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

.markdown-viewer blockquote {
    background: var(--bg-light);
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin: 1rem 0;
    border-radius: var(--border-radius);
}

.markdown-viewer code {
    background: var(--bg-light);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.9em;
}

.markdown-viewer pre {
    background: #2d3748;
    color: #e2e8f0;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 1rem 0;
}

.markdown-viewer pre code {
    background: none;
    padding: 0;
    color: inherit;
}

.markdown-viewer table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.markdown-viewer th,
.markdown-viewer td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.markdown-viewer th {
    background: var(--bg-light);
    font-weight: 600;
}

/* Écran d'accueil */
.welcome-screen {
    text-align: center;
    padding: 3rem 1rem;
}

.formations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.formation-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.formation-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

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

.formation-card.disabled:hover {
    transform: none;
    box-shadow: var(--shadow);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.formation-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.formation-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.card-stats {
    display: flex;
    justify-content: center;
    gap: 1rem;
    font-size: 0.9rem;
}

.card-stats span {
    background: var(--bg-light);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    color: var(--text-light);
}

/* Loading */
.loading {
    text-align: center;
    padding: 3rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Footer */
.footer {
    background: var(--bg-light);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    margin-top: auto;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-light);
}

.footer-links {
    display: flex;
    gap: 1rem;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* Formation Overview */
.formation-overview {
    max-width: 900px;
    margin: 0 auto;
}

.formation-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: linear-gradient(135deg, var(--bg-light) 0%, white 100%);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.formation-header h1 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 2.5rem;
}

.formation-description {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.formation-stats {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.formation-stats .stat {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 500;
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.course-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
    position: relative;
}

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

.course-card .course-number {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--primary-color);
    color: white;
    padding: 0.5rem;
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.course-card h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    padding-right: 3rem;
}

.course-card .course-duration {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: block;
}

.btn-primary {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    border: none;
    cursor: pointer;
}

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

.no-courses {
    text-align: center;
    color: var(--text-light);
    font-style: italic;
    padding: 3rem;
    background: var(--bg-light);
    border-radius: var(--border-radius);
}

/* Course Navigation */
.course-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    gap: 1rem;
}

.nav-btn {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
    flex: 1;
    max-width: 45%;
}

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

.nav-btn.prev {
    justify-content: flex-start;
}

.nav-btn.next {
    justify-content: flex-end;
    margin-left: auto;
}

/* Error and Search Pages */
.error-page,
.search-results {
    text-align: center;
    padding: 3rem 1rem;
}

.error-page h1,
.search-results h1 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.error-page p,
.search-results p {
    color: var(--text-light);
    margin-bottom: 2rem;
}

/* Table des matières fixe */
.table-of-contents {
    position: fixed;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    z-index: 100;
    max-height: calc(100vh - 100px);
    overflow: hidden;
}

.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--secondary-color);
    border-bottom: 1px solid var(--border-color);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    cursor: pointer;
}

.toc-header h3 {
    margin: 0;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.toggle-toc {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.toggle-toc:hover {
    background: var(--primary-dark, #005a9c);
}

.toc-content {
    padding: 1rem;
    max-height: 400px;
    overflow-y: auto;
    transition: all 0.3s ease;
}

.toc-content.collapsed {
    max-height: 0;
    padding: 0 1rem;
    overflow: hidden;
}

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

.toc-list li {
    margin: 0.25rem 0;
}

.toc-link {
    display: block;
    color: var(--text-light);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    transition: var(--transition);
    font-size: 0.9rem;
    border-left: 3px solid transparent;
}

.toc-link:hover {
    background: var(--secondary-color);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.toc-link.active {
    background: var(--primary-color);
    color: white;
    border-left-color: white;
}

.toc-level-1 { 
    font-weight: bold; 
    margin-left: 0; 
    font-size: 1rem;
}
.toc-level-2 { 
    margin-left: 1rem; 
    font-size: 0.9rem;
}
.toc-level-3 { 
    margin-left: 2rem; 
    font-size: 0.85rem; 
    color: var(--text-light);
}
.toc-level-4 { 
    margin-left: 3rem; 
    font-size: 0.8rem; 
    color: var(--text-light);
}
.toc-level-5 { 
    margin-left: 4rem; 
    font-size: 0.8rem; 
    color: var(--text-light);
}
.toc-level-6 { 
    margin-left: 5rem; 
    font-size: 0.8rem; 
    color: var(--text-light);
}

/* Responsive */
@media (min-width: 768px) {
    .main-layout {
        grid-template-columns: 320px 1fr;
    }
    
    .sidebar {
        position: sticky;
        top: 73px; /* Hauteur du header */
        height: calc(100vh - 73px);
        overflow-y: auto;
    }
}

@media (max-width: 767px) {
    .menu-toggle {
        display: block;
    }
    
    .search-input {
        width: 200px;
    }
    
    .sidebar {
        position: fixed;
        top: 73px;
        left: -100%;
        width: 280px;
        height: calc(100vh - 73px);
        z-index: 90;
        background: white;
        box-shadow: var(--shadow);
        transition: left 0.3s ease;
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .content {
        padding: 1rem;
    }
    
    .formations-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .header-content {
        flex-wrap: wrap;
        gap: 1rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .search-input {
        width: 150px;
    }
    
    .formation-card {
        padding: 1.5rem;
    }
    
    .card-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
}

/* Responsive pour la table des matières */
@media (max-width: 768px) {
    .table-of-contents {
        position: relative;
        top: auto;
        margin-bottom: 1rem;
        max-height: none;
    }
    
    .toc-content {
        max-height: 200px;
    }
    
    .toc-header {
        padding: 0.75rem;
    }
    
    .toc-header h3 {
        font-size: 1rem;
    }
    
    .toggle-toc {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .toc-link {
        padding: 0.4rem 0.6rem;
        font-size: 0.85rem;
    }
    
    .toc-level-1 { font-size: 0.9rem; }
    .toc-level-2 { 
        margin-left: 0.8rem; 
        font-size: 0.85rem;
    }
    .toc-level-3 { 
        margin-left: 1.6rem; 
        font-size: 0.8rem;
    }
}