* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #2a5caa; text-decoration: none; transition: all 0.3s ease; }
        a:hover { color: #e74c3c; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { padding-left: 1.5rem; margin: 1rem 0; }
        li { margin-bottom: 0.5rem; }
        h1 { font-size: 2.8rem; margin-bottom: 1.5rem; color: #1a3c6e; line-height: 1.2; }
        h2 { font-size: 2.2rem; margin: 2.5rem 0 1rem; color: #2a5caa; border-bottom: 2px solid #eaeaea; padding-bottom: 0.5rem; }
        h3 { font-size: 1.8rem; margin: 2rem 0 0.8rem; color: #3a7bd5; }
        h4 { font-size: 1.4rem; margin: 1.5rem 0 0.5rem; color: #555; }
        p { margin-bottom: 1.2rem; text-align: justify; }
        .intro { font-size: 1.2rem; font-weight: 500; color: #444; background: #e8f4fc; padding: 1.5rem; border-radius: 10px; border-left: 5px solid #2a5caa; margin-bottom: 2rem; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.4rem; border-radius: 3px; font-weight: 600; }
        .bold { font-weight: 700; color: #1a3c6e; }
        .updated { font-size: 0.9rem; color: #777; margin-top: 0.5rem; font-style: italic; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .main-content { flex: 1; padding: 2rem 0; }
        header { background: linear-gradient(to right, #1a3c6e, #2a5caa); color: white; box-shadow: 0 4px 12px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 1000; }
        .top-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1rem 0;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            color: #FFD700;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
            font-family: 'Arial Black', sans-serif;
            letter-spacing: 1px;
        }
        .logo a:hover { text-decoration: none; color: #fff; }
        nav ul { display: flex; list-style: none; }
        nav li { margin-left: 2rem; }
        nav a { color: white; font-weight: 600; padding: 0.5rem 0; }
        nav a:hover { color: #FFD700; text-decoration: none; border-bottom: 2px solid #FFD700; }
        .hamburger { display: none; font-size: 1.8rem; cursor: pointer; background: none; border: none; color: white; }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            nav ul {
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #1a3c6e;
                padding: 1rem;
                display: none;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
            }
            nav ul.active { display: flex; }
            nav li { margin: 0.8rem 0; margin-left: 0; }
        }
        .breadcrumb { padding: 1rem 0; font-size: 0.9rem; color: #666; }
        .breadcrumb a { color: #555; }
        .breadcrumb span { color: #2a5caa; font-weight: 600; }
        .search-box { margin: 2rem 0; background: white; padding: 1.5rem; border-radius: 10px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); }
        .search-box h3 { margin-top: 0; }
        .search-form { display: flex; }
        .search-form input {
            flex: 1;
            padding: 0.8rem 1rem;
            border: 2px solid #ddd;
            border-radius: 5px 0 0 5px;
            font-size: 1rem;
        }
        .search-form button {
            background: #2a5caa;
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 5px 5px 0;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-form button:hover { background: #1a3c6e; }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        @media (max-width: 992px) {
            .content-grid { grid-template-columns: 1fr; }
        }
        .article-content { background: white; padding: 2.5rem; border-radius: 15px; box-shadow: 0 8px 25px rgba(0,0,0,0.08); }
        .featured-img {
            width: 100%;
            border-radius: 10px;
            margin: 2rem auto;
            border: 5px solid #eaeaea;
        }
        .tip-box {
            background: #e8f7e8;
            border-left: 5px solid #27ae60;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 5px;
        }
        .warning-box {
            background: #fde8e8;
            border-left: 5px solid #e74c3c;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 5px;
        }
        .sidebar-widget {
            background: white;
            padding: 1.5rem;
            margin-bottom: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .sidebar-widget h3 { font-size: 1.4rem; margin-top: 0; }
        .rating-widget, .comment-widget {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin-top: 2rem;
        }
        .stars { display: flex; gap: 0.5rem; margin: 1rem 0; }
        .star { font-size: 1.8rem; color: #ddd; cursor: pointer; transition: color 0.2s; }
        .star.active, .star:hover { color: #FFD700; }
        .interaction-form { display: flex; flex-direction: column; gap: 1rem; }
        .interaction-form input, .interaction-form textarea, .interaction-form select {
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-family: inherit;
            font-size: 1rem;
        }
        .interaction-form button {
            background: #2a5caa;
            color: white;
            border: none;
            padding: 0.8rem;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .interaction-form button:hover { background: #1a3c6e; }
        footer {
            background: #1a3c6e;
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 { color: #FFD700; margin-bottom: 1.2rem; border-bottom: none; }
        .footer-links { list-style: none; padding-left: 0; }
        .footer-links li { margin-bottom: 0.7rem; }
        .footer-links a { color: #ccc; }
        .footer-links a:hover { color: #FFD700; }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 0.5rem 1rem;
            margin: 0.3rem;
            border-radius: 5px;
            font-size: 0.9rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .article-content { padding: 1.5rem; }
            .top-bar { flex-wrap: wrap; }
        }