:root {
            --primary: #1a237e;
            --secondary: #c62828;
            --accent: #ffab00;
            --light: #f5f5f5;
            --dark: #121212;
            --text: #333333;
            --gray: #757575;
            --transition: all 0.3s ease;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --radius: 8px;
            --max-width: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text);
            background-color: #fff;
            overflow-x: hidden;
        }
        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: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .my-logo {
            font-family: 'Impact', 'Arial Black', sans-serif;
            font-size: 2.2rem;
            color: var(--primary);
            text-transform: uppercase;
            letter-spacing: 2px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--accent);
            font-size: 2rem;
        }
        .my-logo span {
            color: var(--secondary);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .main-nav a {
            font-weight: 600;
            font-size: 1.05rem;
            padding: 5px 0;
            position: relative;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--secondary);
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--primary);
        }
        .breadcrumb {
            background-color: var(--light);
            padding: 12px 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #ddd;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 10px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '>';
            margin-left: 10px;
            color: var(--gray);
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .hero {
            background: linear-gradient(135deg, var(--primary) 0%, #283593 100%);
            color: white;
            padding: 60px 0;
            text-align: center;
            margin-bottom: 40px;
        }
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .hero p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.95;
        }
        .search-box {
            max-width: 600px;
            margin: 30px auto 0;
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: 0 6px 20px rgba(0,0,0,0.2);
        }
        .search-box input {
            flex-grow: 1;
            padding: 18px 25px;
            border: none;
            font-size: 1.1rem;
        }
        .search-box button {
            background-color: var(--accent);
            color: var(--dark);
            border: none;
            padding: 0 35px;
            font-weight: bold;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-box button:hover {
            background-color: #ffb300;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin: 40px auto;
        }
        .main-content {
            background: white;
        }
        .sidebar {
            background: var(--light);
            padding: 25px;
            border-radius: var(--radius);
            align-self: start;
            position: sticky;
            top: 150px;
        }
        article {
            margin-bottom: 50px;
        }
        h1, h2, h3, h4 {
            color: var(--primary);
            margin-top: 1.8em;
            margin-bottom: 0.7em;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            border-bottom: 4px solid var(--accent);
            padding-bottom: 15px;
        }
        h2 {
            font-size: 2.2rem;
            padding-left: 15px;
            border-left: 5px solid var(--secondary);
        }
        h3 {
            font-size: 1.8rem;
            color: var(--secondary);
        }
        h4 {
            font-size: 1.4rem;
            color: var(--gray);
        }
        p {
            margin-bottom: 1.5em;
            font-size: 1.1rem;
        }
        strong {
            color: var(--secondary);
            font-weight: 700;
        }
        em {
            color: var(--primary);
            font-style: italic;
        }
        .info-box {
            background-color: #e8f4fd;
            border-left: 5px solid var(--primary);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .featured-image {
            width: 100%;
            border-radius: var(--radius);
            overflow: hidden;
            margin: 30px 0;
            box-shadow: var(--shadow);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 10px;
            font-size: 0.95rem;
        }
        .link-list {
            background: white;
            padding: 20px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 30px 0;
        }
        .link-list h3 {
            margin-top: 0;
        }
        .link-list ul {
            columns: 2;
            list-style: none;
        }
        .link-list li {
            margin-bottom: 10px;
            padding-left: 20px;
            position: relative;
        }
        .link-list li::before {
            content: '▶';
            color: var(--accent);
            position: absolute;
            left: 0;
            font-size: 0.8rem;
        }
        .interactive-module {
            background: linear-gradient(145deg, #ffffff, #f0f0f0);
            border-radius: var(--radius);
            padding: 30px;
            margin: 40px 0;
            box-shadow: var(--shadow);
            border: 1px solid #e0e0e0;
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 25px;
        }
        .module-title i {
            color: var(--secondary);
            font-size: 2rem;
        }
        .rating-stars {
            display: flex;
            gap: 10px;
            margin: 20px 0;
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
        }
        .rating-stars .star {
            transition: var(--transition);
        }
        .rating-stars .star:hover,
        .rating-stars .star.active {
            color: var(--accent);
            transform: scale(1.2);
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 15px;
            border: 1px solid #ccc;
            border-radius: var(--radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26, 35, 126, 0.1);
            outline: none;
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
            font-family: inherit;
        }
        .btn {
            background-color: var(--primary);
            color: white;
            padding: 15px 30px;
            border: none;
            border-radius: var(--radius);
            font-weight: bold;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        .btn:hover {
            background-color: var(--secondary);
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(198, 40, 40, 0.2);
        }
        .btn-secondary {
            background-color: var(--accent);
            color: var(--dark);
        }
        .btn-secondary:hover {
            background-color: #ffb300;
        }
        .site-footer {
            background-color: var(--dark);
            color: white;
            padding: 60px 0 30px;
            margin-top: 80px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-family: 'Impact', sans-serif;
            font-size: 2rem;
            color: white;
            margin-bottom: 20px;
            display: block;
        }
        .footer-logo span {
            color: var(--accent);
        }
        .footer-heading {
            color: var(--accent);
            font-size: 1.3rem;
            margin-bottom: 25px;
            padding-bottom: 10px;
            border-bottom: 2px solid rgba(255, 255, 255, 0.1);
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #ccc;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.05);
            padding: 15px;
            border-radius: var(--radius);
            margin-bottom: 15px;
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateX(5px);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        .update-time {
            background-color: var(--light);
            padding: 15px;
            border-radius: var(--radius);
            margin: 30px 0;
            display: flex;
            align-items: center;
            gap: 15px;
            font-size: 0.95rem;
            color: var(--gray);
        }
        .update-time i {
            color: var(--secondary);
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .sidebar {
                position: static;
            }
            .footer-container {
                grid-template-columns: repeat(2, 1fr);
            }
            h1 {
                font-size: 2.4rem;
            }
            h2 {
                font-size: 2rem;
            }
            .hero h1 {
                font-size: 2.6rem;
            }
        }
        @media (max-width: 768px) {
            .main-nav {
                position: fixed;
                top: 90px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 90px);
                background-color: white;
                transition: left 0.4s ease;
                padding: 30px;
                box-shadow: var(--shadow);
                z-index: 999;
            }
            .main-nav.active {
                left: 0;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 20px;
            }
            .main-nav a {
                font-size: 1.2rem;
                display: block;
                padding: 15px 0;
                border-bottom: 1px solid #eee;
            }
            .hamburger {
                display: block;
            }
            .link-list ul {
                columns: 1;
            }
            .footer-container {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .hero {
                padding: 40px 0;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .search-box {
                flex-direction: column;
                border-radius: var(--radius);
            }
            .search-box input,
            .search-box button {
                width: 100%;
                border-radius: 0;
                padding: 15px;
            }
        }
        @media (max-width: 480px) {
            .header-container {
                padding: 15px;
            }
            .my-logo {
                font-size: 1.8rem;
            }
            .container {
                padding: 0 15px;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .main-content > * {
            animation: fadeIn 0.8s ease forwards;
        }
        .pulse {
            animation: pulse 2s infinite;
        }
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }