/* Reset basique */
body, h1, h2, p { margin: 0; padding: 0; }
body { 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
    background-color: #f4f7f6; 
    color: #333; 
}

/* Barre de navigation */
.navbar { 
    background: #2b2b2b; 
    padding: 15px 30px; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
.navbar .logo { color: #fff; font-size: 20px; font-weight: bold; text-decoration: none; }
.navbar .menu a { color: #ddd; text-decoration: none; margin-left: 20px; transition: color 0.3s; }
.navbar .menu a:hover { color: #4CAF50; }

/* Conteneur principal */
.container { 
    max-width: 400px; 
    margin: 60px auto; 
    background: #fff; 
    padding: 30px; 
    border-radius: 8px; 
    box-shadow: 0 4px 15px rgba(0,0,0,0.05); 
}
.container h2 { text-align: center; margin-bottom: 25px; color: #2b2b2b; }

/* Formulaires */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: bold; font-size: 14px; }
.form-group input { 
    width: 100%; 
    padding: 10px; 
    border: 1px solid #ccc; 
    border-radius: 4px; 
    box-sizing: border-box; 
    font-size: 15px;
}
.form-group input:focus { border-color: #4CAF50; outline: none; }

/* Boutons et alertes */
.btn { 
    width: 100%; 
    background: #4CAF50; 
    color: white; 
    padding: 12px; 
    border: none; 
    border-radius: 4px; 
    font-size: 16px; 
    cursor: pointer; 
    font-weight: bold;
    transition: background 0.3s;
}
.btn:hover { background: #45a049; }
.alert { padding: 15px; margin-bottom: 20px; border-radius: 4px; text-align: center; font-size: 14px; }
.alert-error { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }