:root {
            --primary: #4a6fa5;
            --primary-dark: #385d8a;
            --secondary: #e67e22;
            --accent: #16a085;
            --light: #f8f9fa;
            --dark: #2c3e50;
            --gray: #7f8c8d;
            --border: #e0e0e0;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --radius: 8px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #fff;
            max-width: 100vw;
            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: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--dark) 0%, #34495e 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-family: 'Trebuchet MS', sans-serif;
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(90deg, #1abc9c, #3498db);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        .my-logo:hover {
            transform: scale(1.02);
        }
        .breadcrumb {
            background: rgba(255,255,255,0.1);
            padding: 0.8rem 1.5rem;
            border-radius: var(--radius);
            margin-top: 1rem;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: #bdc3c7;
        }
        .breadcrumb a:hover {
            color: white;
        }
        .breadcrumb i {
            margin: 0 8px;
            font-size: 0.7rem;
        }
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 1rem;
        }
        .main-nav {
            display: flex;
            gap: 2rem;
        }
        .main-nav a {
            color: #ecf0f1;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--secondary);
            transition: var(--transition);
        }
        .main-nav a:hover:after {
            width: 100%;
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        .utility-nav {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }
        .search-form {
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            background: white;
            box-shadow: inset 0 2px 5px rgba(0,0,0,0.1);
        }
        .search-form input {
            border: none;
            padding: 0.6rem 1.2rem;
            width: 220px;
            font-size: 1rem;
            outline: none;
        }
        .search-form button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0.6rem 1.5rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-form button:hover {
            background: var(--primary-dark);
        }
        .hero {
            background: linear-gradient(rgba(44, 62, 80, 0.9), rgba(52, 73, 94, 0.9)), url('https://images.unsplash.com/photo-1635070041078-e363dbe005cb?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 4rem 2rem;
            text-align: center;
            border-radius: 0 0 var(--radius) var(--radius);
            margin-bottom: 3rem;
        }
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 1rem;
            line-height: 1.2;
            text-shadow: 0 2px 10px rgba(0,0,0,0.3);
        }
        .hero p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 2rem;
            opacity: 0.95;
        }
        .update-time {
            background: rgba(22, 160, 133, 0.9);
            display: inline-block;
            padding: 0.7rem 1.5rem;
            border-radius: 50px;
            font-size: 0.95rem;
            font-weight: 600;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 3rem;
            margin: 3rem 0;
        }
        .main-content {
            background: white;
            border-radius: var(--radius);
            padding: 2.5rem;
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: var(--light);
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        article h2 {
            color: var(--dark);
            border-left: 5px solid var(--secondary);
            padding-left: 1rem;
            margin: 3rem 0 1.5rem;
            font-size: 2.2rem;
        }
        article h3 {
            color: var(--primary-dark);
            margin: 2.5rem 0 1rem;
            font-size: 1.7rem;
        }
        article h4 {
            color: var(--accent);
            margin: 2rem 0 0.8rem;
            font-size: 1.4rem;
        }
        article p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.08rem;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: var(--dark);
            background: #f0f7ff;
            padding: 1.5rem;
            border-radius: var(--radius);
            border-left: 4px solid var(--primary);
            margin-bottom: 2.5rem;
        }
        .highlight {
            background: linear-gradient(120deg, #fffbcc 0%, #fffbcc 100%);
            padding: 0.2rem 0.4rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .feature-img {
            margin: 2.5rem auto;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
            max-width: 900px;
        }
        .feature-img img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .feature-img:hover img {
            transform: scale(1.03);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            padding: 0.8rem;
            font-size: 0.95rem;
        }
        blockquote {
            border-left: 4px solid var(--secondary);
            padding: 1.5rem 2rem;
            margin: 2.5rem 0;
            background: #fef9f3;
            border-radius: 0 var(--radius) var(--radius) 0;
            font-style: italic;
            color: #555;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .stat-card {
            background: white;
            padding: 1.8rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            text-align: center;
            border-top: 4px solid var(--accent);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 20px rgba(0,0,0,0.12);
        }
        .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 0.5rem;
        }
        .stat-label {
            color: var(--gray);
            font-weight: 600;
            font-size: 1rem;
        }
        .interactive-module {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            border-radius: var(--radius);
            padding: 2.5rem;
            margin: 3rem 0;
            border: 1px solid var(--border);
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 1rem;
            color: var(--dark);
            margin-bottom: 2rem;
        }
        .module-title i {
            color: var(--secondary);
            font-size: 1.8rem;
        }
        .rating-container {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            font-size: 2rem;
            color: #ddd;
            margin: 1rem 0;
        }
        .star-rating .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating .star:hover,
        .star-rating .star.active {
            color: #f1c40f;
            transform: scale(1.2);
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--dark);
        }
        .form-control {
            width: 100%;
            padding: 0.9rem 1.2rem;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.2);
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .btn {
            display: inline-block;
            background: var(--primary);
            color: white;
            padding: 0.9rem 2.2rem;
            border: none;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(0,0,0,0.15);
        }
        .btn-secondary {
            background: var(--secondary);
        }
        .btn-secondary:hover {
            background: #d35400;
        }
        .link-list {
            list-style: none;
            margin: 2rem 0;
        }
        .link-list li {
            margin-bottom: 1rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .link-list li:before {
            content: '➤';
            position: absolute;
            left: 0;
            color: var(--secondary);
            font-size: 0.9rem;
        }
        .site-footer {
            background: var(--dark);
            color: #ecf0f1;
            padding: 4rem 0 2rem;
            margin-top: 5rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 3rem;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 1.8rem;
            font-size: 1.4rem;
            position: relative;
            padding-bottom: 0.8rem;
        }
        .footer-section h3:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--secondary);
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 1rem 1.5rem;
            margin-bottom: 1rem;
            border-radius: var(--radius);
            border-left: 3px solid var(--accent);
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(255,255,255,0.1);
            transform: translateX(5px);
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #bdc3c7;
            font-size: 0.95rem;
        }
        @media (max-width: 1024px) {
            .content-wrapper {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .sidebar {
                position: static;
            }
            .hero h1 {
                font-size: 2.7rem;
            }
        }
        @media (max-width: 768px) {
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: var(--dark);
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1.5rem;
                box-shadow: 0 10px 15px rgba(0,0,0,0.2);
                border-top: 1px solid rgba(255,255,255,0.1);
            }
            .main-nav.active {
                display: flex;
            }
            .mobile-toggle {
                display: block;
            }
            .utility-nav {
                width: 100%;
                justify-content: center;
                margin-top: 1rem;
            }
            .search-form input {
                width: 100%;
            }
            .hero {
                padding: 3rem 1.5rem;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            .main-content {
                padding: 1.8rem;
            }
            article h2 {
                font-size: 1.9rem;
            }
            article h3 {
                font-size: 1.5rem;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 1.9rem;
            }
            .btn {
                width: 100%;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in {
            animation: fadeInUp 0.6s ease forwards;
        }
        .stagger > * {
            opacity: 0;
            animation: fadeInUp 0.5s ease forwards;
        }
        .stagger > *:nth-child(1) { animation-delay: 0.1s; }
        .stagger > *:nth-child(2) { animation-delay: 0.2s; }
        .stagger > *:nth-child(3) { animation-delay: 0.3s; }
        .stagger > *:nth-child(4) { animation-delay: 0.4s; }