/* Variables */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-gray: #f5f5f5;
    --border-color: #ddd;
    --success-color: #2ecc71;
    --error-color: #e74c3c;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

/* Reset et styles de base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-gray);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--primary-color);
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--secondary-color);
}

.menu-button {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Main Content */
main {
    padding: 2rem 0;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

/* Form Styles */
form {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    margin: 0 auto;
    transition: var(--transition);
}

.form-section {
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.form-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.form-section h2 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    font-size: 1.4rem;
    position: relative;
    padding-left: 1rem;
}

.form-section h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 1.4rem;
    background-color: var(--secondary-color);
    border-radius: 2px;
}

.form-group {
    margin-bottom: 1.8rem;
    position: relative;
}

label {
    display: block;
    margin-bottom: 0.8rem;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
}

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="password"],
input[type="number"],
textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--light-gray);
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
    background-color: white;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

input::placeholder,
textarea::placeholder {
    color: #999;
    font-size: 0.9rem;
}

textarea {
    min-height: 120px;
    resize: vertical;
    line-height: 1.5;
}

.btn-primary {
    background-color: var(--secondary-color);
    color: white;
    padding: 1.2rem 2.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: block;
    width: 100%;
    max-width: 300px;
    margin: 2.5rem auto 0;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

/* Footer */
footer {
    background-color: var(--primary-color);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 3rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--secondary-color);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    color: white;
    font-size: 1.5rem;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--secondary-color);
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .menu-button {
        display: block;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    form {
        padding: 1.5rem;
        margin: 0 1rem;
    }

    .form-section {
        margin-bottom: 2rem;
        padding-bottom: 2rem;
    }

    .form-section h2 {
        font-size: 1.2rem;
        margin-bottom: 1.5rem;
    }

    .btn-primary {
        padding: 1rem 2rem;
        font-size: 1rem;
    }
}

/* Alert Messages */
.alert {
    padding: 1.2rem;
    margin-bottom: 1.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
}

.alert::before {
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 1.2rem;
}

.alert-success {
    background-color: var(--success-color);
    color: white;
}

.alert-success::before {
    content: '\f058';
}

.alert-error {
    background-color: var(--error-color);
    color: white;
}

.alert-error::before {
    content: '\f057';
}

/* Form Validation */
input:invalid {
    border-color: var(--error-color);
    background-color: rgba(231, 76, 60, 0.05);
}

input:valid {
    border-color: var(--success-color);
    background-color: rgba(46, 204, 113, 0.05);
}

/* Password Requirements */
.password-requirements {
    font-size: 0.85rem;
    color: #666;
    margin-top: 0.8rem;
    padding: 1rem;
    background-color: var(--light-gray);
    border-radius: 6px;
    border-left: 4px solid var(--secondary-color);
}

.password-requirements ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.password-requirements li {
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.password-requirements li::before {
    content: '•';
    color: #999;
}

.password-requirements li.valid::before {
    content: '✓';
    color: var(--success-color);
}

.password-requirements li.invalid::before {
    content: '✗';
    color: var(--error-color);
}