* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f9f9f9;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: #0066cc;
        }
        a:hover {
            color: #004499;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        header {
            background: linear-gradient(135deg, #1a237e, #283593);
            color: white;
            padding: 1rem 2rem;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
        }
        .logo a {
            font-size: 2.5rem;
            font-weight: bold;
            color: white;
            font-family: 'Courier New', monospace;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }
        .logo a:hover {
            color: #ffcc00;
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-links a {
            color: white;
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            transition: background 0.3s;
        }
        .nav-links a:hover {
            background: rgba(255, 255, 255, 0.2);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            padding: 1rem 2rem;
            background: #e3f2fd;
            font-size: 0.9rem;
            max-width: 1200px;
            margin: 0 auto;
        }
        .breadcrumb a {
            color: #555;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .container {
            display: grid;
            grid-template-columns: 3fr 1fr;
            gap: 2rem;
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 2rem;
        }
        main {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
        }
        aside {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            border-bottom: 3px solid #ffcc00;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2.2rem;
            color: #283593;
            margin: 2rem 0 1rem;
            padding-left: 0.5rem;
            border-left: 5px solid #0066cc;
        }
        h3 {
            font-size: 1.8rem;
            color: #3949ab;
            margin: 1.5rem 0 0.8rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #5c6bc0;
            margin: 1.2rem 0 0.6rem;
        }
        p {
            margin-bottom: 1.2rem;
            font-size: 1.1rem;
            line-height: 1.8;
        }
        .highlight {
            background: #fff9c4;
            padding: 1rem;
            border-left: 4px solid #ffcc00;
            margin: 1.5rem 0;
            font-style: italic;
        }
        .keyword {
            font-weight: bold;
            color: #d32f2f;
        }
        .featured-image {
            margin: 2rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }
        .featured-image img {
            transition: transform 0.5s;
        }
        .featured-image img:hover {
            transform: scale(1.03);
        }
        .content-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin: 2rem 0;
            padding: 1rem;
            background: #f5f5f5;
            border-radius: 8px;
        }
        .content-links a {
            padding: 0.5rem 1rem;
            background: #0066cc;
            color: white;
            border-radius: 5px;
            transition: background 0.3s;
        }
        .content-links a:hover {
            background: #004499;
        }
        .sidebar-form {
            margin-bottom: 2rem;
            padding: 1.5rem;
            background: #f0f7ff;
            border-radius: 8px;
        }
        .sidebar-form h3 {
            margin-top: 0;
            color: #1a237e;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            margin: 0.5rem 0 1rem;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 1rem;
        }
        button {
            background: #0066cc;
            color: white;
            padding: 0.8rem 1.5rem;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.3s;
        }
        button:hover {
            background: #004499;
        }
        footer {
            background: #1a237e;
            color: white;
            padding: 2rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            max-width: 1200px;
            margin: 0 auto;
        }
        .footer-links, .copyright {
            flex: 1;
            min-width: 300px;
            margin: 1rem;
        }
        friend-link {
            display: block;
            margin: 0.5rem 0;
            padding: 0.5rem;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 5px;
            transition: background 0.3s;
        }
        friend-link a {
            color: #ffcc00;
        }
        friend-link:hover {
            background: rgba(255, 255, 255, 0.2);
        }
        .copyright {
            text-align: center;
            font-size: 0.9rem;
            color: #ccc;
            margin-top: 2rem;
            border-top: 1px solid #3949ab;
            padding-top: 1rem;
        }
        @media (max-width: 768px) {
            .container {
                grid-template-columns: 1fr;
                padding: 0 1rem;
            }
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                gap: 0;
                margin-top: 1rem;
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links li {
                width: 100%;
                text-align: center;
                padding: 0.5rem 0;
                border-bottom: 1px solid rgba(255, 255, 255, 0.2);
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 2rem;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .footer-container {
                flex-direction: column;
                align-items: center;
            }
        }