* { 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;
        }
        a { color: #2c5aa0; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #e63946; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .highlight { background-color: #fffacd; padding: 2px 5px; border-radius: 3px; }
        .site-header {
            background: linear-gradient(90deg, #1e3c72 0%, #2a5298 100%);
            color: white;
            padding: 1.5rem 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;
        }
        .my-logo {
            font-family: 'Arial Black', sans-serif;
            font-size: 2.2rem;
            color: #ffde59;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
            letter-spacing: 1px;
        }
        .my-logo span { color: #4cc9f0; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .main-nav a:hover, .main-nav a.active {
            background-color: rgba(255, 255, 255, 0.15);
            color: #ffde59;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #f1f8ff;
            border-bottom: 1px solid #d1e3ff;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 0.5rem;
            color: #888;
        }
        .hero {
            background: linear-gradient(rgba(30, 60, 114, 0.85), rgba(42, 82, 152, 0.9)), url('https://images.unsplash.com/photo-1635070041078-e363dbe005cb?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 4rem 2rem;
            border-radius: 0 0 20px 20px;
            margin-bottom: 2rem;
            text-align: center;
        }
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 1rem;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.5);
        }
        .hero p { font-size: 1.2rem; max-width: 800px; margin: 0 auto; }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 3rem 0;
        }
        .article-content { background: white; padding: 2.5rem; border-radius: 15px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08); }
        h1, h2, h3, h4 { color: #1e3c72; margin-top: 2rem; margin-bottom: 1rem; line-height: 1.3; }
        h1 { font-size: 2.8rem; border-bottom: 3px solid #ffde59; padding-bottom: 0.5rem; }
        h2 { font-size: 2.2rem; padding-left: 1rem; border-left: 5px solid #4cc9f0; }
        h3 { font-size: 1.8rem; color: #2a5298; }
        h4 { font-size: 1.4rem; color: #e63946; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .intro { font-size: 1.2rem; color: #555; font-weight: 500; background: #f0f8ff; padding: 1.5rem; border-radius: 10px; border-left: 4px solid #2a5298; }
        .article-img {
            margin: 2rem auto;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
            max-width: 800px;
        }
        .article-img figcaption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 0.8rem;
            background: #f9f9f9;
            font-size: 0.95rem;
        }
        .interactive-box {
            background: #f8f9fa;
            border: 2px dashed #2c5aa0;
            border-radius: 12px;
            padding: 2rem;
            margin: 2.5rem 0;
        }
        .interactive-box h3 { margin-top: 0; }
        form { display: grid; gap: 1rem; }
        input, textarea, select {
            padding: 0.9rem;
            border: 1px solid #ccc;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #2c5aa0;
            box-shadow: 0 0 0 3px rgba(44, 90, 160, 0.2);
        }
        button, .btn {
            background: linear-gradient(to right, #2c5aa0, #e63946);
            color: white;
            border: none;
            padding: 1rem 1.8rem;
            border-radius: 8px;
            font-weight: 700;
            cursor: pointer;
            transition: transform 0.3s, box-shadow 0.3s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.7rem;
        }
        button:hover, .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(44, 90, 160, 0.3);
        }
        .rating { display: flex; gap: 0.5rem; justify-content: center; }
        .star { font-size: 2rem; color: #ddd; cursor: pointer; transition: color 0.2s; }
        .star:hover, .star.active { color: #ffde59; }
        .sidebar { padding: 1.5rem; }
        .sidebar-widget {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            margin-bottom: 2rem;
        }
        .sidebar-widget h3 { font-size: 1.4rem; margin-bottom: 1rem; color: #e63946; border-bottom: 2px solid #ffde59; padding-bottom: 0.5rem; }
        .related-links ul { list-style: none; }
        .related-links li { margin-bottom: 0.8rem; padding-left: 1.2rem; position: relative; }
        .related-links li::before { content: "🎯"; position: absolute; left: 0; }
        .site-footer {
            background: #1a1a2e;
            color: #ccc;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-bottom: 2rem; }
        .footer-section h4 { color: #ffde59; font-size: 1.3rem; margin-bottom: 1.2rem; }
        friend-link {
            display: block;
            padding: 0.8rem;
            background: #16213e;
            margin-bottom: 0.7rem;
            border-radius: 6px;
            border-left: 4px solid #4cc9f0;
            transition: background 0.3s;
        }
        friend-link:hover { background: #2a5298; }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2a5298;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
            .hero h1 { font-size: 2.5rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #1e3c72;
                padding: 1rem;
                border-radius: 0 0 15px 15px;
                box-shadow: 0 10px 15px rgba(0,0,0,0.2);
            }
            .main-nav.active ul { display: flex; }
            .header-content { flex-wrap: wrap; }
            .hero { padding: 3rem 1rem; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.9rem; }
        }
        @media (max-width: 480px) {
            .hero h1 { font-size: 1.9rem; }
            .article-content { padding: 1.5rem; }
            .my-logo { font-size: 1.8rem; }
        }