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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

header {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.summary {
    background-color: white;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.summary h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #3498db;
}

#news-container {
    display: grid;
    gap: 1.5rem;
}

.news-item {
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1.5rem;
    background-color: #fafafa;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.news-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.news-item h3 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.news-item p {
    margin-bottom: 1rem;
    color: #555;
}

.news-item .category {
    display: inline-block;
    background-color: #3498db;
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
}

.news-item .date {
    color: #7f8c8d;
    font-size: 0.9rem;
}

.categories {
    background-color: white;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.categories h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #3498db;
}

.category-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.category-btn {
    background-color: #ecf0f1;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.category-btn:hover {
    background-color: #bdc3c7;
}

.category-btn.active {
    background-color: #3498db;
    color: white;
}

footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .summary, .categories {
        padding: 1rem;
    }
    
    .category-buttons {
        justify-content: center;
    }
}