* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, sans-serif;
        }
        :root {
            --primary: #1a73e8;
            --primary-dark: #0d47a1;
            --secondary: #ff5722;
            --dark: #202124;
            --light: #f8f9fa;
            --gray: #5f6368;
            --border: #dadce0;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f5f7fa;
            color: var(--dark);
            line-height: 1.7;
            font-size: 18px;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
            border-bottom: 1px solid var(--border);
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
        }
        .search-form {
            display: flex;
            flex: 0 1 400px;
        }
        .search-input {
            flex-grow: 1;
            padding: 12px 18px;
            border: 2px solid var(--border);
            border-radius: 30px 0 0 30px;
            font-size: 1rem;
            outline: none;
        }
        .search-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 30px 30px 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-btn:hover {
            background: var(--primary-dark);
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--dark);
        }
        nav {
            padding: 15px 0;
        }
        .nav-links {
            display: flex;
            list-style: none;
            justify-content: center;
            gap: 30px;
        }
        .nav-links a {
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 6px;
            color: var(--gray);
        }
        .nav-links a:hover, .nav-links a.active {
            color: var(--primary);
            background-color: rgba(26, 115, 232, 0.08);
        }
        .breadcrumb {
            padding: 12px 0;
            font-size: 0.9rem;
            color: var(--gray);
            background: #f1f3f4;
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb i {
            margin: 0 8px;
        }
        .hero {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: white;
            padding: 60px 0;
            text-align: center;
            margin-bottom: 40px;
            border-radius: 0 0 20px 20px;
        }
        .hero h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin: 40px 0;
        }
        .content-area {
            background: white;
            padding: 40px;
            border-radius: 16px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: white;
            padding: 25px;
            border-radius: 16px;
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 140px;
        }
        article h2, article h3 {
            color: var(--primary-dark);
            margin: 30px 0 15px;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--border);
        }
        article h2 {
            font-size: 1.8rem;
        }
        article h3 {
            font-size: 1.5rem;
        }
        article p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .highlight {
            background-color: #e8f0fe;
            border-left: 4px solid var(--primary);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-img {
            margin: 30px 0;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
        }
        .feature-img img {
            width: 100%;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            padding: 10px;
            font-size: 0.9rem;
        }
        .interactive-section {
            background: #f9f9f9;
            padding: 30px;
            border-radius: 12px;
            margin: 40px 0;
        }
        .rating, .comment-form {
            margin-bottom: 30px;
        }
        .rating h3, .comment-form h3 {
            margin-bottom: 15px;
        }
        .stars {
            display: flex;
            gap: 5px;
            margin-bottom: 15px;
        }
        .star {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover, .star.active {
            color: #ffc107;
        }
        .rating-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .rating-btn:hover {
            background: var(--primary-dark);
        }
        .comment-form input, .comment-form textarea {
            width: 100%;
            padding: 15px;
            margin-bottom: 15px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 1rem;
            resize: vertical;
        }
        .comment-form button {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .comment-form button:hover {
            background: #e64a19;
        }
        .long-tail-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
            margin: 40px 0;
        }
        .web-link {
            background: white;
            padding: 15px;
            border-radius: 8px;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .web-link:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow);
            transform: translateY(-3px);
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-col h4 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: #fff;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: #bdc1c6;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #3c4043;
            color: #9aa0a6;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            body {
                font-size: 16px;
            }
            .header-top {
                flex-wrap: wrap;
            }
            .search-form {
                order: 3;
                flex: 1 1 100%;
                margin-top: 15px;
            }
            .hamburger {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: white;
                box-shadow: var(--shadow);
                padding: 20px;
                z-index: 999;
            }
            .nav-links.active {
                display: flex;
            }
            .hero {
                padding: 40px 20px;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .content-area {
                padding: 25px;
            }
            .long-tail-links {
                grid-template-columns: 1fr;
            }
        }