* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            color: #1a73e8;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #0d47a1;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .site-header {
            background: linear-gradient(135deg, #0d47a1, #42a5f5);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: 1px;
            color: white;
            display: flex;
            align-items: center;
        }
        .my-logo i {
            margin-right: 10px;
            color: #ffeb3b;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }
        .main-nav {
            display: flex;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-list a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
        }
        .nav-list a:hover,
        .nav-list a.active {
            color: #ffeb3b;
            border-bottom-color: #ffeb3b;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            max-width: 1200px;
            margin: 1rem auto;
            padding: 0 20px;
            font-size: 0.9rem;
            color: #666;
        }
        .breadcrumb a {
            color: #666;
        }
        .breadcrumb a:hover {
            color: #1a73e8;
        }
        .main-container {
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            flex: 1;
        }
        @media (max-width: 992px) {
            .main-container {
                grid-template-columns: 1fr;
            }
        }
        .content-area {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .sidebar {
            background: white;
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        h1 {
            font-size: 2.8rem;
            color: #0d47a1;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 6px solid #42a5f5;
            padding-left: 1rem;
        }
        h2 {
            font-size: 2rem;
            color: #1565c0;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e3f2fd;
        }
        h3 {
            font-size: 1.5rem;
            color: #1976d2;
            margin: 1.8rem 0 0.8rem;
        }
        h4 {
            font-size: 1.2rem;
            color: #2196f3;
            margin: 1.5rem 0 0.6rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: #555;
            background: #e3f2fd;
            padding: 1.2rem;
            border-radius: 8px;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fff9c4;
            padding: 0.2rem 0.4rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .updated-time {
            font-style: italic;
            color: #777;
            font-size: 0.9rem;
            margin-bottom: 2rem;
            display: block;
        }
        .featured-image {
            margin: 2rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        }
        .featured-image figcaption {
            text-align: center;
            font-size: 0.9rem;
            color: #666;
            padding: 0.5rem;
            background: #f5f5f5;
        }
        ul, ol {
            margin-left: 1.5rem;
            margin-bottom: 1.2rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .interactive-module {
            background: #f1f8ff;
            border: 1px solid #bbdefb;
            border-radius: 10px;
            padding: 1.8rem;
            margin: 2.5rem 0;
        }
        .module-title {
            color: #0d47a1;
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .module-title i {
            color: #ff9800;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        input, textarea, select {
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 1rem;
        }
        button {
            background: linear-gradient(to right, #0d47a1, #42a5f5);
            color: white;
            border: none;
            padding: 0.9rem 1.5rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(66, 165, 245, 0.4);
        }
        .rating-stars {
            display: flex;
            gap: 5px;
            margin: 0.5rem 0;
            font-size: 1.5rem;
            color: #ffc107;
        }
        .sidebar h3 {
            font-size: 1.3rem;
            color: #333;
            margin-top: 0;
        }
        .related-links {
            list-style: none;
            margin-left: 0;
        }
        .related-links li {
            margin-bottom: 0.8rem;
            padding-left: 1rem;
            border-left: 3px solid #42a5f5;
        }
        .site-footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 200px;
        }
        .footer-section h4 {
            color: #42a5f5;
            margin-bottom: 1rem;
            font-size: 1.2rem;
        }
        .footer-links-list {
            list-style: none;
            margin-left: 0;
        }
        .footer-links-list li {
            margin-bottom: 0.6rem;
        }
        .footer-links-list a {
            color: #bdc3c7;
        }
        .footer-links-list a:hover {
            color: white;
        }
        friend-link {
            display: block;
            background: #34495e;
            padding: 1rem;
            border-radius: 8px;
            margin: 1rem 0;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #34495e;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                width: 100%;
                display: none;
                margin-top: 1rem;
            }
            .main-nav.active {
                display: block;
            }
            .nav-list {
                flex-direction: column;
                gap: 0;
            }
            .nav-list li {
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .nav-list a {
                display: block;
                padding: 0.8rem 0;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .content-area {
                padding: 1.5rem;
            }
        }