:root {
    --primary-blue: #1e3c72;
    --secondary-blue: #2a5298;
    --light-blue: #e8f0fe;
    --accent-blue: #4a90e2;
    --white: #ffffff;
    --gray-light: #f5f7fa;
    --gray-medium: #cbd5e0;
    --text-dark: #2d3748;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--gray-light) 0%, var(--light-blue) 100%);
    color: var(--text-dark);
    line-height: 1.6;
}

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

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    padding: 20px 0;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

.header h1 {
    font-size: 1.8rem;
    margin-bottom: 5px;
}

.header p {
    opacity: 0.9;
}

/* Navigation */
.nav {
    background: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    gap: 30px;
}

.nav-link {
    display: inline-block;
    padding: 15px 0;
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    border-bottom: 2px solid transparent;
}

.nav-link:hover, .nav-link.active {
    color: var(--accent-blue);
    border-bottom-color: var(--accent-blue);
}

/* Formulaires */
.form-card {
    background: var(--white);
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    padding: 30px;
    margin-bottom: 30px;
}

.form-section {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--gray-medium);
}

.form-section h2 {
    color: var(--primary-blue);
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.form-section h3 {
    color: var(--secondary-blue);
    margin: 20px 0 15px;
    font-size: 1.2rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
}

.form-group select, 
.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--gray-medium);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group select:focus,
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.radio-group, .checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 10px;
}

.radio-group label, .checkbox-group label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: normal;
    cursor: pointer;
}

.btn-submit {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    border: none;
    padding: 15px 40px;
    font-size: 1.1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    font-weight: 600;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(30,60,114,0.3);
}

/* Dashboard */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--white);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    border-left: 4px solid var(--accent-blue);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-blue);
}

.stat-label {
    color: var(--text-dark);
    margin-top: 5px;
}

.comparison-table {
    width: 100%;
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.comparison-table th {
    background: var(--primary-blue);
    color: var(--white);
    padding: 12px;
    text-align: left;
}

.comparison-table td {
    padding: 12px;
    border-bottom: 1px solid var(--gray-medium);
}

.comparison-table tr:hover {
    background: var(--light-blue);
}

/* Alertes */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

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

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

/* Responsive */
@media (max-width: 768px) {
    .nav-content {
        flex-direction: column;
        gap: 0;
    }
    
    .nav-link {
        padding: 10px 0;
    }
    
    .form-card {
        padding: 20px;
    }
    
    .radio-group, .checkbox-group {
        flex-direction: column;
        gap: 10px;
    }
}