/* Styles globaux */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background: linear-gradient(to right, #f0f2f5, #e2e8f0);
    color: #333;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

/* Header */
header {
    background-color: #2d3748; /* gris foncé plus doux */
    color: #fff;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    margin-bottom: 25px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

header h1 {
    margin: 0;
    font-size: 2rem;
    font-weight: 600;
}

header p {
    margin: 8px 0 0 0;
}

header a {
    color: #a0aec0;
    text-decoration: none;
    font-weight: 500;
}

header a:hover {
    color: #fff;
    text-decoration: underline;
}

/* Titres */
h1, h2, h3 {
    color: #1a202c;
    margin-top: 25px;
    font-weight: 600;
    text-align: center;
}

/* Formulaire de modification */
form {
    background-color: #fff;
    padding: 30px 25px;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
    max-width: 500px;
    width: 100%;
    box-sizing: border-box;
    margin-top: 20px;
}

/* Labels et inputs */
label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

input[type="text"],
textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #cbd5e0;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 1rem;
    margin-bottom: 15px;
}

/* Boutons */
button {
    width: 100%;
    background-color: #3182ce;
    color: #fff;
    padding: 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #2b6cb0;
}

/* Liens annuler */
a {
    display: block;
    text-align: center;
    margin-top: 15px;
    color: #3182ce;
    text-decoration: none;
    font-weight: 500;
}

a:hover {
    text-decoration: underline;
}

/* Messages d'erreur */
.error {
    color: #c53030;
    background-color: #fed7d7;
    border: 1px solid #f56565;
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 15px;
    text-align: center;
}

/* Séparateurs */
hr {
    border: 0;
    border-top: 1px solid #cbd5e0;
    margin: 25px 0;
}

/* Responsive */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    form {
        padding: 20px;
    }
}