* {
            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;
            overflow-x: hidden;
        }
        a {
            color: #007bff;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #0056b3;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2rem;
            font-weight: 700;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
        }
        .logo a:hover {
            color: #ffc107;
        }
        .logo i {
            margin-right: 10px;
            font-size: 2.2rem;
        }
        .nav-container {
            display: flex;
            align-items: center;
        }
        .main-nav {
            display: flex;
            list-style: none;
        }
        .main-nav li {
            margin-left: 1.5rem;
        }
        .main-nav a {
            color: white;
            font-weight: 500;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
            transition: background 0.3s;
        }
        .main-nav a:hover {
            background: rgba(255,255,255,0.2);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 1rem 0;
            background: #e9ecef;
            font-size: 0.9rem;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '>';
            margin: 0 10px;
            color: #6c757d;
        }
        .breadcrumb a {
            color: #495057;
        }
        .breadcrumb a:hover {
            color: #007bff;
        }
        main {
            padding: 2rem 0;
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            margin-bottom: 2rem;
        }
        article {
            padding: 0 2rem;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            border-bottom: 4px solid #ffc107;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2.2rem;
            color: #283593;
            margin: 2rem 0 1rem;
            padding-top: 1rem;
        }
        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;
            text-align: justify;
            font-size: 1.1rem;
        }
        .emphasis {
            font-weight: bold;
            color: #d32f2f;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .article-img {
            float: right;
            margin: 0 0 1.5rem 2rem;
            max-width: 450px;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        .article-img img {
            border-radius: 8px;
        }
        .feature-box {
            background: #f1f8ff;
            border-left: 5px solid #007bff;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-box h3 {
            margin-top: 0;
        }
        form {
            display: grid;
            gap: 1rem;
            margin-top: 1rem;
        }
        input, textarea, select {
            padding: 0.8rem;
            border: 1px solid #ced4da;
            border-radius: 4px;
            font-size: 1rem;
            width: 100%;
        }
        button {
            padding: 0.8rem 1.5rem;
            background: #007bff;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.3s;
        }
        button:hover {
            background: #0056b3;
        }
        .rating {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .rating input {
            width: auto;
        }
        footer {
            background: #1a237e;
            color: white;
            padding: 2rem 0;
            margin-top: 2rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .friend-link {
            background: #283593;
            padding: 1.5rem;
            border-radius: 8px;
        }
        .friend-link h3 {
            color: #ffc107;
            margin-top: 0;
        }
        .friend-link ul {
            list-style: none;
        }
        .friend-link li {
            margin-bottom: 0.8rem;
        }
        .friend-link a {
            color: #bbdefb;
        }
        .friend-link a:hover {
            color: white;
        }
        .copyright {
            text-align: center;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #bbdefb;
        }
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                align-items: flex-start;
            }
            .nav-container {
                width: 100%;
                justify-content: space-between;
                margin-top: 1rem;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #283593;
                padding: 1rem;
                border-radius: 8px;
            }
            .main-nav.active {
                display: flex;
            }
            .main-nav li {
                margin: 0.5rem 0;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .article-img {
                float: none;
                margin: 1.5rem auto;
                max-width: 100%;
            }
            article {
                padding: 0 1rem;
            }
        }
        .clearfix::after {
            content: "";
            display: table;
            clear: both;
        }
        .text-center {
            text-align: center;
        }