* {
            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: #f5f7fa;
        }
        a {
            text-decoration: none;
            color: #007bff;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #0056b3;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        header {
            background: linear-gradient(135deg, #1a237e 0%, #4a148c 100%);
            color: white;
            padding: 1rem 2rem;
            box-shadow: 0 4px 12px 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: 1.8rem;
            font-weight: bold;
            color: white;
            text-transform: uppercase;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
        }
        .logo i {
            margin-right: 10px;
            color: #ff9800;
        }
        .breadcrumb {
            margin-top: 0.5rem;
            font-size: 0.9rem;
            color: #ddd;
        }
        .breadcrumb a {
            color: #ffcc80;
        }
        .breadcrumb a:hover {
            color: #ff9800;
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .nav-links a {
            color: white;
            font-weight: 500;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .nav-links a:hover {
            background-color: rgba(255,255,255,0.15);
            color: #ffcc80;
        }
        .nav-links a i {
            font-size: 1rem;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: white;
            background: none;
            border: none;
        }
        main {
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
        }
        article {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
        }
        aside {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            align-self: start;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #ff9800;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #4a148c;
            margin: 2rem 0 1rem;
            padding-left: 0.5rem;
            border-left: 5px solid #007bff;
        }
        h3 {
            font-size: 1.5rem;
            color: #333;
            margin: 1.5rem 0 0.8rem;
        }
        h4 {
            font-size: 1.2rem;
            color: #555;
            margin: 1rem 0 0.5rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
            hyphens: auto;
        }
        .highlight {
            background-color: #fff9c4;
            padding: 1rem;
            border-left: 4px solid #ffd600;
            margin: 1.5rem 0;
            font-weight: bold;
            color: #5d4037;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .image-container {
            margin: 2rem auto;
            text-align: center;
        }
        .image-container img {
            border-radius: 10px;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            margin-bottom: 0.5rem;
        }
        .image-container figcaption {
            font-style: italic;
            color: #666;
            font-size: 0.9rem;
        }
        .link-list {
            list-style: none;
            padding: 1rem;
            background: #e3f2fd;
            border-radius: 8px;
            margin: 1.5rem 0;
        }
        .link-list li {
            margin-bottom: 0.8rem;
            display: flex;
            align-items: center;
        }
        .link-list i {
            color: #007bff;
            margin-right: 10px;
        }
        .form-section {
            background: #f8f9fa;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
            border: 1px solid #dee2e6;
        }
        .form-section h3 {
            color: #1a237e;
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid #ced4da;
            border-radius: 6px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            border-color: #007bff;
            outline: none;
            box-shadow: 0 0 0 3px rgba(0,123,255,0.25);
        }
        button {
            background: linear-gradient(to right, #007bff, #1a237e);
            color: white;
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: 6px;
            cursor: pointer;
            font-weight: bold;
            transition: background 0.3s, transform 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        button:hover {
            background: linear-gradient(to right, #0056b3, #4a148c);
            transform: translateY(-2px);
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s;
        }
        .star:hover,
        .star.active {
            color: #ffc107;
        }
        aside h3 {
            color: #4a148c;
            margin-top: 0;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #ff9800;
        }
        .sidebar-links {
            list-style: none;
            margin-top: 1rem;
        }
        .sidebar-links li {
            margin-bottom: 0.8rem;
            padding: 0.8rem;
            background: #f8f9fa;
            border-radius: 6px;
            transition: background 0.3s;
        }
        .sidebar-links li:hover {
            background: #e9ecef;
        }
        .sidebar-links a {
            color: #333;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .sidebar-links a:hover {
            color: #007bff;
        }
        footer {
            background: #1a237e;
            color: white;
            padding: 2rem;
            margin-top: 3rem;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h4 {
            color: #ffcc80;
            margin-bottom: 1rem;
            font-size: 1.2rem;
        }
        friend-link {
            display: block;
            margin-top: 1rem;
        }
        .friend-links {
            list-style: none;
        }
        .friend-links li {
            margin-bottom: 0.5rem;
        }
        .friend-links a {
            color: #bbdefb;
        }
        .friend-links a:hover {
            color: white;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #ccc;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
            .nav-links {
                gap: 1rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #1a237e;
                padding: 1rem;
                z-index: 1000;
                box-shadow: 0 4px 8px rgba(0,0,0,0.2);
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links li {
                width: 100%;
            }
            .nav-links a {
                padding: 1rem;
                justify-content: center;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            article, aside {
                padding: 1.5rem;
            }
        }
        @media (max-width: 480px) {
            header, main, footer {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
        }
        .text-center {
            text-align: center;
        }
        .mb-3 {
            margin-bottom: 1.5rem;
        }
        .mt-3 {
            margin-top: 1.5rem;
        }
        .flex {
            display: flex;
            align-items: center;
        }
        .gap-1 {
            gap: 1rem;
        }