* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --bg-color: #f5f6fa;
    --card-bg: #ffffff;
    --text-color: #2c3e50;
    --text-muted: #7f8c8d;
    --border-color: #dcdde1;
}

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

a {
    color: var(--secondary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.logo {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

.logo:hover {
    text-decoration: none;
}

.nav {
    display: flex;
    gap: 1rem;
}

.nav a {
    color: rgba(255, 255, 255, 0.8);
}

.nav a:hover {
    color: white;
}

.search-form {
    display: flex;
    gap: 0.5rem;
    margin-left: auto;
}

.search-form input {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    width: 200px;
}

.search-form button {
    padding: 0.5rem 1rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.search-form button:hover {
    background-color: #2980b9;
}

.main {
    min-height: calc(100vh - 160px);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.footer {
    background-color: var(--primary-color);
    color: rgba(255, 255, 255, 0.7);
    text-align: center;
    padding: 1rem;
}

h1, h2, h3 {
    margin-bottom: 1rem;
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.stat {
    background-color: var(--card-bg);
    padding: 1.5rem 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: var(--secondary-color);
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.category-tree {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.category-item {
    background-color: var(--card-bg);
    border-radius: 8px;
    padding: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.category-item.level-1 {
    margin-left: 1.5rem;
    background-color: #fafafa;
}

.category-item.level-2 {
    margin-left: 3rem;
    background-color: #f5f5f5;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.category-name {
    font-weight: 500;
    font-size: 1.1rem;
}

.category-count {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-left: auto;
}

.subcategories {
    margin-top: 0.5rem;
}

.breadcrumb {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    font-size: 0.9rem;
}

.breadcrumb .separator {
    margin: 0 0.5rem;
    color: var(--text-muted);
}

.breadcrumb .current {
    color: var(--text-muted);
}

.subcategories-section {
    margin-bottom: 2rem;
}

.subcategory-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}

.subcategory-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.subcategory-card:hover {
    text-decoration: none;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.subcategory-count {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.topic-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.topic-card {
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.topic-card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.topic-title {
    font-size: 1.1rem;
    font-weight: 500;
    display: block;
    margin-bottom: 0.5rem;
}

.topic-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    margin-right: 0.5rem;
}

.badge.pinned {
    background-color: #27ae60;
    color: white;
}

.badge.locked {
    background-color: #95a5a6;
    color: white;
}

.topic-rating {
    color: #27ae60;
    font-weight: 500;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
    padding: 1rem;
}

.page-link {
    padding: 0.5rem 1rem;
    background-color: var(--secondary-color);
    color: white;
    border-radius: 4px;
}

.page-link:hover {
    background-color: #2980b9;
    text-decoration: none;
}

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

.no-topics, .no-results {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    background-color: var(--card-bg);
    border-radius: 8px;
}

.topic-detail {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.topic-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.topic-header h1 {
    margin-bottom: 0.75rem;
}

.topic-info {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.topic-tags {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--bg-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.topic-content {
    padding: 1.5rem;
    line-height: 1.8;
}

.topic-content h1,
.topic-content h2,
.topic-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.topic-content p {
    margin-bottom: 1rem;
}

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

.topic-content li {
    margin-bottom: 0.5rem;
}

.topic-content pre {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    margin-bottom: 1rem;
}

.topic-content code {
    font-family: 'Fira Code', 'Monaco', monospace;
    font-size: 0.9rem;
}

.topic-content blockquote {
    border-left: 4px solid var(--secondary-color);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-muted);
    font-style: italic;
}

.topic-content img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    margin: 1rem 0;
}

.topic-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

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

.topic-content th {
    background-color: var(--bg-color);
    font-weight: 600;
}

.topic-content hr {
    border: none;
    border-top: 2px solid var(--border-color);
    margin: 2rem 0;
}

.topic-actions {
    margin-top: 1.5rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--secondary-color);
    color: white;
    border-radius: 4px;
    font-weight: 500;
}

.btn:hover {
    background-color: #2980b9;
    text-decoration: none;
}

.search-box {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.search-box input {
    flex: 1;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1.1rem;
}

.search-box input:focus {
    outline: none;
    border-color: var(--secondary-color);
}

.search-box button {
    padding: 1rem 2rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    cursor: pointer;
}

.search-box button:hover {
    background-color: #2980b9;
}

.search-results h2 {
    margin-bottom: 1.5rem;
}

/* Page d'erreur 404 */
.error-page {
    text-align: center;
    padding: 4rem 2rem;
}

.error-page h1 {
    font-size: 6rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.error-page .error-message {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.error-page .error-description {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .search-form {
        margin-left: 0;
        width: 100%;
    }

    .search-form input {
        flex: 1;
    }

    .stats {
        gap: 1rem;
    }

    .stat {
        padding: 1rem;
        flex: 1;
        min-width: 140px;
    }

    .topic-info {
        flex-direction: column;
        gap: 0.5rem;
    }

    .search-box {
        flex-direction: column;
    }

    .error-page h1 {
        font-size: 4rem;
    }
}