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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: #ffffff;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
} 

.container {
    max-width: 600px;
    width: 100%;
    background: white;
    border-radius: 20px;
    padding: 40px;
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    color: #333;
    font-size: 32px;
    margin-bottom: 10px;
}

.header p {
    color: #666;
    font-size: 16px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 600;
    font-size: 14px;
}

.form-group label.optional::after {
    content: " (facultatif)";
    color: #999;
    font-weight: 400;
    font-size: 12px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"] {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #154AA8;
}

.music-group {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.music-group h3 {
    color: #000000;
    font-size: 18px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.music-group h3::before {
    content: "";
    margin-right: 0;
    font-size: 0;
}

.music-fields {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5px;
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background: #154AA8;
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(21, 74, 168, 0.4);
}

.submit-btn:active {
    transform: translateY(0);
}

.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 25px;
    font-size: 14px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 24px;
    }
    
    .music-fields {
        grid-template-columns: 1fr;
    }
}