:root {
            --primary-color: #ff6b35;
            --secondary-color: #1a1a2e;
            --accent-color: #16213e;
            --text-light: #ffffff;
            --text-dark: #333333;
            --gradient-bg: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background: var(--gradient-bg);
            min-height: 100vh;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            background: linear-gradient(45deg, #ff6b35, #ff8e53);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }
        .hero-section {
            background: url('https://via.placeholder.com/1600x900') center/cover no-repeat;
            padding: 120px 0;
            position: relative;
            color: var(--text-light);
            text-align: center;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.6);
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            margin: -80px 0 40px;
            position: relative;
            z-index: 3;
        }
        h1, h2, h3 {
            color: var(--secondary-color);
            font-weight: 700;
            margin-bottom: 1.5rem;
        }
        h1 {
            font-size: 2.8rem;
            background: linear-gradient(45deg, #ff6b35, #ff8e53);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        h2 {
            border-left: 5px solid var(--primary-color);
            padding-left: 15px;
            margin-top: 2.5rem;
        }
        .highlight-text {
            background: linear-gradient(45deg, #ff6b35, #ff8e53);
            color: white;
            padding: 15px 20px;
            border-radius: 10px;
            margin: 25px 0;
            font-weight: 600;
            box-shadow: 0 5px 15px rgba(255,107,53,0.3);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .img-container {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            margin: 30px 0;
            transition: transform 0.3s ease;
        }
        .img-container:hover {
            transform: translateY(-5px);
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-light) !important;
            transition: color 0.3s ease;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .footer {
            background: var(--secondary-color);
            color: var(--text-light);
            padding: 40px 0 20px;
            margin-top: 60px;
        }
        .keyword-badge {
            background: var(--primary-color);
            color: white;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            margin: 0 5px 10px 0;
            display: inline-block;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
            }
            h1 {
                font-size: 2.2rem;
            }
            .content-section {
                margin: -50px 15px 40px;
            }
        }
        .content-paragraph {
            margin-bottom: 1.8rem;
            text-align: justify;
        }
        .toc-item {
            padding: 8px 15px;
            border-left: 3px solid transparent;
            transition: all 0.3s ease;
        }
        .toc-item:hover {
            border-left-color: var(--primary-color);
            background: rgba(255,107,53,0.1);
        }