* { 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;
        }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { background: linear-gradient(90deg, #1a2980, #26d0ce); color: white; padding: 1rem 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; }
        .logo a { font-size: 2rem; font-weight: 800; color: white; text-decoration: none; font-family: 'Arial Black', sans-serif; letter-spacing: 1px; transition: transform 0.3s; display: flex; align-items: center; }
        .logo a:hover { transform: scale(1.05); }
        .logo a i { margin-right: 10px; font-size: 2.2rem; }
        .my-logo { border-bottom: 3px solid #ffcc00; padding-bottom: 3px; }
        nav ul { display: flex; list-style: none; }
        nav ul li { margin-left: 2rem; }
        nav ul li a { color: white; text-decoration: none; font-weight: 600; padding: 8px 12px; border-radius: 5px; transition: all 0.3s; }
        nav ul li a:hover, nav ul li a.active { background: rgba(255,255,255,0.2); }
        .hamburger { display: none; font-size: 1.8rem; cursor: pointer; }
        .breadcrumb { background: #e9f2fa; padding: 12px 20px; border-radius: 8px; margin: 1.5rem 0; font-size: 0.9rem; }
        .breadcrumb a { color: #1a2980; text-decoration: none; }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb span { color: #666; }
        main { display: grid; grid-template-columns: 1fr 300px; gap: 2.5rem; margin: 2rem 0; }
        .article-content { background: white; padding: 2.5rem; border-radius: 15px; box-shadow: 0 8px 30px rgba(0,0,0,0.08); }
        .sidebar { background: white; padding: 1.5rem; border-radius: 15px; box-shadow: 0 5px 20px rgba(0,0,0,0.06); align-self: start; position: sticky; top: 120px; }
        h1 { color: #1a2980; font-size: 2.8rem; margin-bottom: 1.5rem; line-height: 1.2; border-bottom: 3px solid #26d0ce; padding-bottom: 15px; }
        h2 { color: #1a2980; font-size: 2rem; margin: 2.5rem 0 1rem; padding-left: 10px; border-left: 5px solid #ffcc00; }
        h3 { color: #26a69a; font-size: 1.6rem; margin: 2rem 0 1rem; }
        h4 { color: #555; font-size: 1.3rem; margin: 1.5rem 0 0.8rem; }
        p { margin-bottom: 1.5rem; font-size: 1.1rem; text-align: justify; }
        .highlight { background: linear-gradient(90deg, #fff9c4, transparent); padding: 1.5rem; border-left: 5px solid #ffcc00; border-radius: 0 10px 10px 0; margin: 2rem 0; }
        .note { background: #e3f2fd; padding: 1rem; border-radius: 8px; border-left: 5px solid #2196f3; margin: 1.5rem 0; }
        .tip { background: #e8f5e9; padding: 1rem; border-radius: 8px; border-left: 5px solid #4caf50; margin: 1.5rem 0; }
        .stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; margin: 2rem 0; }
        .stat-box { background: #1a2980; color: white; padding: 1.5rem; border-radius: 10px; text-align: center; transition: transform 0.3s; }
        .stat-box:hover { transform: translateY(-5px); }
        .stat-box h3 { color: #ffcc00; margin: 0; font-size: 2.5rem; }
        .stat-box p { color: #ddd; margin: 0; }
        .article-img { width: 100%; height: auto; border-radius: 12px; margin: 2rem 0; box-shadow: 0 10px 25px rgba(0,0,0,0.15); transition: transform 0.4s; }
        .article-img:hover { transform: scale(1.01); }
        a.content-link { color: #1a2980; font-weight: 600; text-decoration: none; border-bottom: 2px dashed #26d0ce; padding-bottom: 2px; transition: all 0.3s; }
        a.content-link:hover { color: #ff6600; border-bottom-style: solid; }
        .form-box { background: #f8fdff; padding: 1.8rem; border-radius: 12px; border: 2px solid #e1f5fe; margin: 2.5rem 0; }
        .form-title { color: #1a2980; margin-bottom: 1.2rem; display: flex; align-items: center; }
        .form-title i { margin-right: 10px; }
        input, textarea, select { width: 100%; padding: 14px; margin-bottom: 1.2rem; border: 1px solid #b0bec5; border-radius: 8px; font-size: 1rem; transition: border 0.3s; }
        input:focus, textarea:focus, select:focus { border-color: #1a2980; outline: none; box-shadow: 0 0 0 3px rgba(26,41,128,0.1); }
        button { background: linear-gradient(90deg, #1a2980, #26d0ce); color: white; border: none; padding: 15px 30px; border-radius: 8px; font-size: 1.1rem; font-weight: 600; cursor: pointer; transition: all 0.3s; display: inline-flex; align-items: center; }
        button:hover { background: linear-gradient(90deg, #26d0ce, #1a2980); transform: translateY(-3px); box-shadow: 0 7px 15px rgba(26,41,128,0.3); }
        button i { margin-right: 10px; }
        .rating { display: flex; align-items: center; margin: 1.5rem 0; }
        .rating label { margin-right: 15px; font-weight: 600; }
        .stars { color: #ffcc00; font-size: 1.8rem; cursor: pointer; }
        .stars i:hover { transform: scale(1.2); }
        .comment { background: #f9f9f9; padding: 1.5rem; border-radius: 10px; margin-bottom: 1.5rem; border-left: 4px solid #26d0ce; }
        .comment-header { display: flex; justify-content: space-between; margin-bottom: 10px; color: #555; }
        .comment-author { font-weight: bold; color: #1a2980; }
        .sidebar h3 { color: #1a2980; margin-bottom: 1.5rem; padding-bottom: 10px; border-bottom: 2px solid #ffcc00; }
        .sidebar ul { list-style: none; }
        .sidebar ul li { margin-bottom: 1rem; }
        .sidebar ul li a { color: #333; text-decoration: none; padding: 10px 15px; display: block; border-radius: 8px; transition: all 0.3s; background: #f1f8ff; }
        .sidebar ul li a:hover { background: #1a2980; color: white; transform: translateX(10px); }
        .sidebar ul li a i { margin-right: 10px; }
        footer { background: linear-gradient(90deg, #1a2980, #0d1b4c); color: white; padding: 3rem 0 1.5rem; margin-top: 4rem; }
        .footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2.5rem; }
        .footer-section h3 { color: #ffcc00; margin-bottom: 1.5rem; font-size: 1.5rem; }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #ddd; text-decoration: none; transition: color 0.3s; }
        .footer-links a:hover { color: #ffcc00; padding-left: 5px; }
        friend-link { display: block; background: rgba(255,255,255,0.1); padding: 12px; border-radius: 8px; margin-bottom: 10px; }
        friend-link a { color: #ffcc00; font-weight: bold; }
        .copyright { text-align: center; margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.2); color: #aaa; font-size: 0.9rem; }
        @media (max-width: 992px) {
            main { grid-template-columns: 1fr; }
            .sidebar { position: static; }
        }
        @media (max-width: 768px) {
            .header-content { flex-direction: column; align-items: flex-start; }
            nav { width: 100%; margin-top: 1rem; display: none; }
            nav.active { display: block; }
            nav ul { flex-direction: column; }
            nav ul li { margin: 0.5rem 0; }
            .hamburger { display: block; align-self: flex-end; position: absolute; top: 1.5rem; right: 20px; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
        }