* {
            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: #f8f9fa;
            padding: 0;
            margin: 0;
        }
        a {
            text-decoration: none;
            color: #0077cc;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #005fa3;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: white;
            padding: 15px 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: white;
            display: flex;
            align-items: center;
        }
        .logo .my-logo {
            background: #ff9800;
            padding: 8px 15px;
            border-radius: 8px;
            margin-right: 10px;
            transition: transform 0.3s ease;
        }
        .logo .my-logo:hover {
            transform: scale(1.05);
        }
        .logo a {
            color: white;
        }
        .main-nav {
            display: flex;
            align-items: center;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        .nav-list a {
            color: white;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 5px;
            transition: background 0.3s ease;
        }
        .nav-list a:hover {
            background: rgba(255,255,255,0.2);
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 15px 0;
            background: #e3f2fd;
            margin-bottom: 20px;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            gap: 10px;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 10px;
            color: #666;
        }
        .search-form {
            display: flex;
            margin-left: 20px;
        }
        .search-form input {
            padding: 10px 15px;
            border: none;
            border-radius: 5px 0 0 5px;
            width: 200px;
            outline: none;
        }
        .search-form button {
            background: #ff9800;
            color: white;
            border: none;
            padding: 10px 15px;
            border-radius: 0 5px 5px 0;
            cursor: pointer;
            transition: background 0.3s ease;
        }
        .search-form button:hover {
            background: #e68900;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 30px 0;
        }
        @media (max-width: 768px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
        }
        .sidebar {
            background: white;
            padding: 25px;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            height: fit-content;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 25px;
            line-height: 1.2;
            border-bottom: 3px solid #ff9800;
            padding-bottom: 15px;
        }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin: 35px 0 20px;
            padding-top: 10px;
        }
        h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 25px 0 15px;
        }
        h4 {
            font-size: 1.3rem;
            color: #5c6bc0;
            margin: 20px 0 10px;
        }
        p {
            margin-bottom: 20px;
            font-size: 1.1rem;
            line-height: 1.8;
            text-align: justify;
        }
        .highlight {
            background: #e8f4fd;
            padding: 20px;
            border-left: 5px solid #0077cc;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        b, strong {
            color: #1a237e;
        }
        .btn {
            display: inline-block;
            background: #0077cc;
            color: white;
            padding: 12px 25px;
            border-radius: 8px;
            font-weight: bold;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
            text-align: center;
        }
        .btn:hover {
            background: #005fa3;
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0,119,204,0.3);
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: #333;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 12px;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: #0077cc;
            outline: none;
        }
        .rating {
            display: flex;
            gap: 10px;
            flex-direction: row-reverse;
            justify-content: flex-end;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s;
        }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label {
            color: #ff9800;
        }
        .site-footer {
            background: #1a237e;
            color: white;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-section h3 {
            color: #ff9800;
            margin-bottom: 20px;
            font-size: 1.4rem;
        }
        .friend-links {
            list-style: none;
        }
        .friend-links li {
            margin-bottom: 10px;
        }
        .friend-links a {
            color: #bbdefb;
            padding: 5px 0;
            display: inline-block;
            transition: color 0.3s;
        }
        .friend-links a:hover {
            color: white;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #bbdefb;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.4rem; }
            .nav-list { gap: 15px; }
        }
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                align-items: flex-start;
            }
            .main-nav {
                width: 100%;
                margin-top: 15px;
                justify-content: space-between;
            }
            .nav-list {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #283593;
                padding: 20px;
                border-radius: 10px;
                margin-top: 15px;
            }
            .nav-list.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .search-form {
                margin: 15px 0 0;
                width: 100%;
            }
            .search-form input {
                width: 100%;
            }
            .breadcrumb ul {
                font-size: 0.9rem;
            }
        }
        @media (max-width: 480px) {
            .article-content, .sidebar {
                padding: 20px;
            }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            p { font-size: 1rem; }
        }