/* Base et Couleurs */
:root {
    --bg-color: #f4f7f6;
    --text-color: #333333;
    --primary-color: #2c3e50;
    --accent-color: #3498db;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
}

/* En-tête */
header {
    background-color: var(--primary-color);
    color: white;
    padding: 4rem 2rem;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
}

header p {
    font-size: 1.2rem;
    opacity: 0.8;
    margin-top: 0.5rem;
}

/* Conteneur principal */
.container {
    max-width: 1100px;
    margin: 3rem auto;
    padding: 0 1rem;
}

.section-title {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
    color: var(--primary-color);
}

/* Grille des projets */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* Cartes Projets */
.card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.1);
}

.card h3 {
    margin-top: 0;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.card p {
    flex-grow: 1;
    font-size: 0.95rem;
    color: #555;
}

.tags {
    margin-top: 1rem;
    margin-bottom: 1rem;
}

.tag {
    display: inline-block;
    background: #e9ecef;
    color: #495057;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-right: 0.3rem;
    margin-bottom: 0.3rem;
}

.btn {
    text-align: center;
    display: block;
    padding: 0.6rem;
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
    transition: background 0.2s;
}

.btn:hover {
    background-color: #2980b9;
}

/* Pied de page */
footer {
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
    color: #777;
    font-size: 0.9rem;
}