:root {
            --primary-color: #0081b4;
            --primary-light: #4da6d4;
            --primary-dark: #005a82;
            --secondary-color: #f8f9fa;
            --accent-color: #e3f2fd;
            --text-dark: #2c3e50;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --danger-color: #dc3545;
        }

        * {
            font-family: 'Inter', sans-serif;
        }

        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            color: var(--text-dark);
            line-height: 1.6;
        }

        .navbar {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            box-shadow: 0 4px 20px rgba(0, 129, 180, 0.3);
        }

        .borda-logo {
                filter: drop-shadow(1px 0 0 white) drop-shadow(0 1px 0 white)
                drop-shadow(-1px 0 0 white) drop-shadow(0 -1px 0 white);
                max-width: 30px;
            }

        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
            color: white;
            padding: 4rem 0;
            margin-bottom: 3rem;
        }

        .hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .hero-subtitle {
            font-size: 1.3rem;
            opacity: 0.9;
            font-weight: 300;
        }

        .toc-card {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 129, 180, 0.1);
            border-left: 5px solid var(--primary-color);
            position: sticky;
            top: 100px;
            max-height: 80vh;
            overflow-y: auto;
        }

        .toc-item {
            padding: 12px 20px;
            border-bottom: 1px solid #e9ecef;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            color: var(--text-dark);
            display: block;
        }

        .toc-item:hover {
            background: var(--accent-color);
            color: var(--primary-color);
            transform: translateX(5px);
            text-decoration: none;
        }

        .toc-item.active {
            background: var(--primary-color);
            color: white;
            font-weight: 600;
        }

        .content-section {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 129, 180, 0.1);
            margin-bottom: 2rem;
            padding: 2.5rem;
            border-left: 5px solid var(--primary-color);
        }

        .section-title {
            color: var(--primary-color);
            font-weight: 700;
            margin-bottom: 1.5rem;
            font-size: 2.2rem;
        }

        .subsection-title {
            color: var(--primary-dark);
            font-weight: 600;
            margin: 2rem 0 1rem 0;
            font-size: 1.5rem;
        }

        .highlight-box {
            background: linear-gradient(135deg, var(--accent-color) 0%, rgba(0, 129, 180, 0.1) 100%);
            border: 2px solid var(--primary-light);
            border-radius: 10px;
            padding: 1.5rem;
            margin: 1.5rem 0;
        }

        .important-box {
            background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
            border: 2px solid var(--warning-color);
            border-radius: 10px;
            padding: 1.5rem;
            margin: 1.5rem 0;
        }

        .timeline {
            position: relative;
            padding: 20px 0;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 50%;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--primary-color);
            transform: translateX(-50%);
        }

        .timeline-item {
            margin: 30px 0;
            position: relative;
        }

        .timeline-content {
            background: white;
            border-radius: 10px;
            padding: 20px;
            box-shadow: 0 5px 15px rgba(0, 129, 180, 0.1);
            width: 45%;
            position: relative;
        }

        .timeline-item:nth-child(odd) .timeline-content {
            margin-left: 55%;
        }

        .timeline-item:nth-child(even) .timeline-content {
            margin-right: 55%;
        }

        .timeline-year {
            background: var(--primary-color);
            color: white;
            padding: 10px 20px;
            border-radius: 20px;
            font-weight: 700;
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            z-index: 2;
        }

        .calculation-box {
            background: linear-gradient(135deg, #e8f5e8 0%, #d4edda 100%);
            border: 2px solid var(--success-color);
            border-radius: 10px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            min-height: 100px; ;
        }

        .tax-comparison {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin: 20px 0;
        }

        .tax-box {
            background: white;
            border-radius: 10px;
            padding: 20px;
            text-align: center;
            box-shadow: 0 5px 15px rgba(0, 129, 180, 0.1);
            border: 2px solid var(--primary-light);
        }

        .tax-rate {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary-color);
        }

        .image-placeholder {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border: 2px dashed var(--primary-light);
            border-radius: 10px;
            padding: 40px;
            text-align: center;
            margin: 20px 0;
            color: var(--primary-color);
        }

        .faq-item {
            background: white;
            border-radius: 10px;
            margin-bottom: 15px;
            box-shadow: 0 3px 10px rgba(0, 129, 180, 0.1);
            overflow: hidden;
        }

        .faq-question {
            background: var(--primary-color);
            color: white;
            padding: 15px 20px;
            cursor: pointer;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-answer {
            padding: 20px;
            display: none;
        }

        .faq-item.active .faq-answer {
            display: block;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
            border: none;
            border-radius: 25px;
            padding: 12px 30px;
            font-weight: 600;
            box-shadow: 0 5px 15px rgba(0, 129, 180, 0.3);
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 129, 180, 0.4);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }

        .stat-card {
            background: white;
            border-radius: 10px;
            padding: 20px;
            text-align: center;
            box-shadow: 0 5px 15px rgba(0, 129, 180, 0.1);
            border-top: 4px solid var(--primary-color);
        }

        .stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
        }

        .stat-label {
            color: var(--text-dark);
            font-weight: 500;
            margin-top: 10px;
        }

        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            
            .timeline::before {
                left: 20px;
            }
            
            .timeline-content {
                width: calc(100% - 60px);
                margin-left: 60px !important;
                margin-right: 0 !important;
            }
            
            .timeline-year {
                left: 20px;
                transform: translateX(-50%);
            }
            
            .tax-comparison {
                grid-template-columns: 1fr;
            }
        }

        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary-color);
            color: white;
            border: none;
            border-radius: 50%;
            width: 50px;
            height: 50px;
            display: none;
            box-shadow: 0 5px 15px rgba(0, 129, 180, 0.3);
            transition: all 0.3s ease;
            z-index: 1000;
        }

        .scroll-top:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(0, 129, 180, 0.4);
        }