* {
            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: #f5f7fa;
            padding: 0;
            margin: 0;
        }
        a {
            text-decoration: none;
            color: #3498db;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #1d6fa5;
        }
        ul, ol {
            padding-left: 20px;
            margin: 15px 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        header {
            background: linear-gradient(135deg, #1a237e, #283593);
            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;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 900;
            color: #ffcc00;
            text-transform: uppercase;
            letter-spacing: 2px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .my-logo:hover {
            color: #ffdd44;
        }
        .breadcrumb {
            margin: 10px 0;
            font-size: 0.9rem;
            color: #b0b0b0;
        }
        .breadcrumb a {
            color: #ffcc00;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .nav-desktop {
            display: flex;
            gap: 25px;
        }
        .nav-desktop a {
            color: white;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 5px;
        }
        .nav-desktop a:hover {
            background-color: rgba(255, 255, 255, 0.2);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: #1a237e;
            padding: 15px;
            border-radius: 0 0 10px 10px;
            margin-top: 10px;
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: white;
            padding: 10px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .nav-mobile a:last-child {
            border-bottom: none;
        }
        .search-form {
            display: flex;
            margin-left: 20px;
        }
        .search-form input {
            padding: 8px 12px;
            border: none;
            border-radius: 5px 0 0 5px;
            outline: none;
            width: 200px;
        }
        .search-form button {
            background-color: #ffcc00;
            border: none;
            padding: 8px 15px;
            border-radius: 0 5px 5px 0;
            cursor: pointer;
            color: #1a237e;
            font-weight: bold;
        }
        .search-form button:hover {
            background-color: #ffdd44;
        }
        main {
            padding: 30px 0;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin: 20px auto;
        }
        .article-header {
            text-align: center;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 3px solid #ffcc00;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 15px;
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin: 30px 0 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e0e0e0;
        }
        h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 25px 0 10px;
        }
        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-color: #fff9c4;
            padding: 15px;
            border-left: 5px solid #ffcc00;
            margin: 20px 0;
            border-radius: 0 8px 8px 0;
        }
        .emoji {
            font-size: 1.2rem;
            margin-right: 8px;
        }
        .image-container {
            text-align: center;
            margin: 30px 0;
        }
        .image-container img {
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            border: 5px solid #ffcc00;
        }
        .image-caption {
            font-style: italic;
            color: #666;
            margin-top: 10px;
        }
        .tier-list-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin: 30px 0;
        }
        .tier-card {
            background: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            border: 2px solid #e0e0e0;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .tier-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .update-time {
            text-align: right;
            font-size: 0.9rem;
            color: #777;
            margin-top: 20px;
            padding-top: 10px;
            border-top: 1px solid #eee;
        }
        .user-interaction {
            margin: 40px 0;
            padding: 25px;
            background-color: #f1f8ff;
            border-radius: 10px;
            border: 2px dashed #3498db;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: #1a237e;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 12px;
            border: 2px solid #ccc;
            border-radius: 5px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: #3498db;
            outline: none;
        }
        .rating-stars {
            display: flex;
            gap: 10px;
            font-size: 2rem;
            color: #ffcc00;
            cursor: pointer;
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }
        .submit-btn {
            background-color: #2ecc71;
            color: white;
            padding: 12px 25px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 1.1rem;
            font-weight: bold;
            transition: background-color 0.3s ease;
        }
        .submit-btn:hover {
            background-color: #27ae60;
        }
        footer {
            background-color: #1a237e;
            color: white;
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }
        .footer-section h3 {
            color: #ffcc00;
            margin-bottom: 20px;
        }
        .footer-links a {
            display: block;
            color: #b0b0b0;
            margin-bottom: 10px;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
            transition: all 0.3s ease;
        }
        friend-link {
            display: inline-block;
            background-color: #283593;
            color: white;
            padding: 10px 20px;
            margin: 5px;
            border-radius: 5px;
            text-decoration: none;
        }
        friend-link:hover {
            background-color: #3949ab;
        }
        .copyright {
            text-align: center;
            margin-top: 30px;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #b0b0b0;
        }
        @media (max-width: 768px) {
            .header-content {
                flex-wrap: wrap;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .search-form input {
                width: 150px;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.4rem;
            }
            p {
                font-size: 1rem;
            }
            .tier-list-section {
                grid-template-columns: 1fr;
            }
        }