/* Amélioration visuelle avec votre structure originale */
        :root {
            --primary-color: #2563eb;
            --primary-dark: #1d4ed8;
            --secondary-color: #64748b;
            --accent-color: #0ea5e9;
            --success-color: #059669;
            --background-color: #f8fafc;
            --surface-color: #ffffff;
            --text-primary: #1e293b;
            --text-secondary: #475569;
            --text-muted: #64748b;
            --border-color: #e2e8f0;
            --border-hover: #cbd5e1;
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
        }

        .logo h1 {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary-color);
            font-family: 'JetBrains Mono', monospace;
        }

        .logo span {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: 500;
            background: var(--background-color);
            padding: 4px 8px;
            border-radius: var(--radius-sm);
        }

       

        /* Section principale */
        .hero-section {
            background: linear-gradient(135deg, var(--surface-color) 0%, var(--background-color) 100%);
            padding: 48px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .hero-content {
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }

        .hero-content h1 {
            font-size: 48px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            line-height: 1.2;
        }

        .hero-subtitle {
            font-size: 20px;
            color: var(--text-secondary);
            margin-bottom: 32px;
            font-weight: 400;
        }

        .hero-description {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 40px;
            line-height: 1.7;
        }

        /* Grille des calculateurs - structure originale améliorée */
        .calculators-section {
            padding: 64px 0;
            background: var(--surface-color);
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-title {
            font-size: 36px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .section-subtitle {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        /* Grille des calculateurs */
        .calculators-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 24px;
            margin-top: 40px;
        }

        .calculator-category {
            background: var(--surface-color);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 32px;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
        }

        .calculator-category:hover {
            border-color: var(--border-hover);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .category-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 24px;
        }

        .category-icon {
            font-size: 24px;
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-md);
            font-weight: 600;
        }

        .category-title {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .calculator-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .calculator-item {
            display: block;
            text-decoration: none;
            color: inherit;
            padding: 16px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            transition: all 0.2s ease;
            background: var(--background-color);
        }

        .calculator-item:hover {
            text-decoration: none;
            border-color: var(--primary-color);
            background: var(--surface-color);
            box-shadow: var(--shadow-sm);
        }

        .calculator-name {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
            display: block;
        }

        .calculator-description {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* Section d'information enrichie */
        .info-section {
            padding: 64px 0;
            background: var(--background-color);
        }

        .info-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 32px;
            margin-top: 40px;
        }

        .info-card {
            background: var(--surface-color);
            padding: 32px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .info-card-header {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 20px;
        }

        .info-icon {
            font-size: 20px;
            width: 40px;
            height: 40px;
            background: var(--accent-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-md);
        }

        .info-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .info-card p, .info-card li {
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 8px;
        }

        .info-card ul {
            padding-left: 20px;
        }

        .feature-list {
            list-style: none;
            padding: 0;
        }

        .feature-list li {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 8px;
        }

        .feature-list li::before {
            content: "✓";
            color: var(--success-color);
            font-weight: bold;
            font-size: 16px;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }

            .header-content {
                flex-direction: column;
                gap: 16px;
            }

            nav {
                gap: 16px;
            }

            .hero-content h1 {
                font-size: 36px;
            }

            .hero-subtitle {
                font-size: 18px;
            }

            .calculators-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .calculator-category {
                padding: 24px;
            }

            .info-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

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

        .calculator-category {
            animation: fadeInUp 0.6s ease forwards;
        }

        .calculator-category:nth-child(2) {
            animation-delay: 0.1s;
        }

        .calculator-category:nth-child(3) {
            animation-delay: 0.2s;
        }

        .calculator-category:nth-child(4) {
            animation-delay: 0.3s;
        }