:root {
            --primary-blue: #1e88e5;
            --deep-blue: #0d47a1;
            --water-blue: #4fc3f7;
            --accent-gold: #ffd54f;
            --text-dark: #2c3e50;
            --light-bg: #f8f9fa;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background: linear-gradient(135deg, #e3f2fd 0%, #f8f9fa 100%);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--deep-blue);
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }
        .nav-link {
            font-weight: 500;
            transition: all 0.3s ease;
        }
        .nav-link:hover {
            color: var(--primary-blue) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(30, 136, 229, 0.9), rgba(13, 71, 161, 0.8)), url('https://via.placeholder.com/1200x600') center/cover no-repeat;
            color: white;
            padding: 100px 0;
            text-align: center;
        }
        .section-title {
            color: var(--deep-blue);
            border-left: 5px solid var(--accent-gold);
            padding-left: 15px;
            margin: 40px 0 25px;
        }
        .content-card {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            padding: 30px;
            margin-bottom: 30px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
        }
        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-blue);
            margin-bottom: 15px;
        }
        .image-container {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            margin: 25px 0;
        }
        .image-container img {
            width: 100%;
            height: auto;
            transition: transform 0.5s ease;
        }
        .image-container:hover img {
            transform: scale(1.03);
        }
        .highlight-text {
            background: linear-gradient(120deg, #e3f2fd 0%, #bbdefb 100%);
            border-left: 4px solid var(--primary-blue);
            padding: 20px;
            border-radius: 0 10px 10px 0;
            margin: 25px 0;
        }
        .key-point {
            background: white;
            padding: 15px;
            border-radius: 10px;
            margin: 15px 0;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
            border-left: 3px solid var(--accent-gold);
        }
        footer {
            background: var(--deep-blue);
            color: white;
            padding: 40px 0 20px;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary-blue);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            box-shadow: 0 4px 10px rgba(0,0,0,0.2);
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top:hover {
            background: var(--deep-blue);
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 60px 0;
            }
            .content-card {
                padding: 20px;
            }
        }