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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --background: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 3px solid var(--primary-color);
}

h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.form-section {
    margin-bottom: 40px;
    padding: 30px;
    background: var(--background);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.form-section h2 {
    color: var(--text-primary);
    font-size: 1.5rem;
    margin-bottom: 20px;
    font-weight: 600;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group select {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group small {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 4px;
}

.score-display {
    background: white;
    padding: 15px 20px;
    border-radius: 6px;
    border: 2px solid var(--primary-color);
    margin-top: 15px;
}

.score-display span {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.score-display strong {
    color: var(--primary-color);
    font-size: 1.3rem;
}

.results-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-left: none;
    color: white;
}

.results-section h2 {
    color: white;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.result-card {
    background: rgba(255, 255, 255, 0.15);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.result-card.highlight {
    background: rgba(255, 255, 255, 0.25);
    border: 2px solid rgba(255, 255, 255, 0.4);
}

.result-label {
    font-size: 0.9rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.result-value {
    font-size: 1.8rem;
    font-weight: 700;
}

.button-group {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 30px;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 32px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #475569;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-success:hover:not(:disabled) {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-section {
    animation: fadeIn 0.5s ease-out;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 2rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }
}

/* Messages d'erreur */
.error-message {
    background: #fee2e2;
    color: #991b1b;
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    border-left: 4px solid #dc2626;
}

.success-message {
    background: #d1fae5;
    color: #065f46;
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    border-left: 4px solid #10b981;
}

/* Loading spinner */
.spinner {
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-left: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Améliorations pour tablettes */
@media (min-width: 768px) and (max-width: 1024px) {
    .form-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Impression */
@media print {
    body {
        background: white;
    }

    .container {
        box-shadow: none;
    }

    .button-group {
        display: none;
    }
}