* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary-blue: #1a365d;
            --secondary-blue: #2c5282;
            --accent-gold: #d4af37;
            --accent-red: #c53030;
            --light-bg: #f7fafc;
            --dark-text: #2d3748;
            --light-text: #718096;
            --border-color: #e2e8f0;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: var(--light-bg);
            color: var(--dark-text);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul {
            list-style: none;
        }
        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, var(--primary-blue), #15325c);
            color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo span {
            color: var(--accent-gold);
        }
        .logo i {
            font-size: 2rem;
            color: var(--accent-gold);
        }
        .search-container {
            flex-grow: 1;
            max-width: 400px;
            margin: 0 30px;
        }
        .search-form {
            display: flex;
            position: relative;
        }
        .search-input {
            width: 100%;
            padding: 12px 20px;
            border: none;
            border-radius: 30px;
            background: rgba(255, 255, 255, 0.9);
            font-size: 1rem;
            outline: none;
        }
        .search-btn {
            position: absolute;
            right: 5px;
            top: 5px;
            background: var(--secondary-blue);
            color: white;
            border: none;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-btn:hover {
            background: var(--accent-gold);
            transform: scale(1.05);
        }
        .menu-toggle {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: white;
        }
        nav ul {
            display: flex;
            gap: 25px;
        }
        nav a {
            padding: 8px 12px;
            border-radius: 4px;
            font-weight: 600;
            font-size: 1.05rem;
        }
        nav a:hover {
            background: rgba(255, 255, 255, 0.15);
            color: var(--accent-gold);
        }
        .breadcrumb {
            background: rgba(0, 0, 0, 0.2);
            padding: 12px 0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 10px;
            color: var(--accent-gold);
        }
        .breadcrumb a:hover {
            color: var(--accent-gold);
        }
        main {
            padding: 30px 0;
        }
        .article-header {
            text-align: center;
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 2px solid var(--border-color);
        }
        .article-header h1 {
            font-size: 2.5rem;
            color: var(--primary-blue);
            margin-bottom: 15px;
            line-height: 1.3;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            color: var(--light-text);
            font-size: 0.95rem;
        }
        .article-meta i {
            margin-right: 5px;
            color: var(--accent-gold);
        }
        .content-section {
            background: white;
            border-radius: 10px;
            padding: 30px;
            margin-bottom: 30px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .content-section:hover {
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }
        .section-title {
            color: var(--primary-blue);
            font-size: 1.8rem;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent-gold);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .section-title i {
            color: var(--accent-gold);
        }
        .section-subtitle {
            color: var(--secondary-blue);
            font-size: 1.4rem;
            margin: 25px 0 15px;
        }
        p {
            margin-bottom: 20px;
            font-size: 1.1rem;
            line-height: 1.8;
        }
        .highlight {
            background-color: #fffacd;
            padding: 20px;
            border-left: 4px solid var(--accent-gold);
            margin: 25px 0;
            border-radius: 0 5px 5px 0;
        }
        .tip-box {
            background-color: #e6f7ff;
            padding: 20px;
            border-radius: 8px;
            margin: 25px 0;
            border-left: 4px solid var(--secondary-blue);
        }
        .tip-title {
            color: var(--secondary-blue);
            font-weight: bold;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 10px;
        }
        .tier-table-container {
            overflow-x: auto;
            margin: 30px 0;
        }
        .tier-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 800px;
        }
        .tier-table th {
            background: var(--primary-blue);
            color: white;
            padding: 15px;
            text-align: left;
        }
        .tier-table td {
            padding: 15px;
            border-bottom: 1px solid var(--border-color);
        }
        .tier-table tr:nth-child(even) {
            background-color: #f8fafc;
        }
        .tier-table tr:hover {
            background-color: #edf2f7;
        }
        .tier-badge {
            display: inline-block;
            padding: 5px 12px;
            border-radius: 20px;
            font-weight: bold;
            font-size: 0.9rem;
            text-align: center;
            min-width: 80px;
        }
        .tier-s { background-color: #48bb78; color: white; }
        .tier-a { background-color: #38b2ac; color: white; }
        .tier-b { background-color: #4299e1; color: white; }
        .tier-c { background-color: #ed8936; color: white; }
        .tier-d { background-color: #f56565; color: white; }
        .article-image {
            margin: 30px auto;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
            max-width: 900px;
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--light-text);
            padding: 10px;
            background: #f8fafc;
            font-size: 0.95rem;
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin: 40px 0;
        }
        .user-rating, .user-comment, .search-module {
            background: white;
            padding: 25px;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        .feature-title {
            color: var(--primary-blue);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .rating-stars {
            display: flex;
            gap: 5px;
            margin: 15px 0;
            font-size: 1.8rem;
            color: #e2e8f0;
        }
        .rating-stars .active {
            color: var(--accent-gold);
        }
        .rating-stars i {
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--secondary-blue);
            box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.2);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .btn {
            display: inline-block;
            background: var(--secondary-blue);
            color: white;
            padding: 12px 30px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
        }
        .btn:hover {
            background: var(--primary-blue);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        }
        .btn-gold {
            background: var(--accent-gold);
        }
        .btn-gold:hover {
            background: #b8941f;
        }
        .web-links-container {
            background: white;
            padding: 30px;
            border-radius: 10px;
            margin: 40px 0;
            box-shadow: var(--shadow);
        }
        .web-links-title {
            color: var(--primary-blue);
            font-size: 1.5rem;
            margin-bottom: 20px;
            text-align: center;
        }
        .web-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
        }
        .web-link {
            background: #f8fafc;
            padding: 15px;
            border-radius: 5px;
            border-left: 3px solid var(--secondary-blue);
            transition: var(--transition);
        }
        .web-link:hover {
            background: #e6f0ff;
            transform: translateX(5px);
        }
        footer {
            background: var(--primary-blue);
            color: white;
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: var(--accent-gold);
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a:hover {
            color: var(--accent-gold);
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            color: #cbd5e0;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--accent-gold);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            cursor: pointer;
            box-shadow: var(--shadow);
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 999;
        }
        .back-to-top.visible {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary-blue);
            transform: translateY(-5px);
        }
        @media (max-width: 1024px) {
            .container {
                padding: 0 15px;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .header-top {
                flex-wrap: wrap;
            }
            .search-container {
                order: 3;
                max-width: 100%;
                margin: 15px 0 0;
            }
            .menu-toggle {
                display: block;
            }
            nav {
                display: none;
                width: 100%;
                margin-top: 15px;
            }
            nav.active {
                display: block;
            }
            nav ul {
                flex-direction: column;
                gap: 0;
            }
            nav li {
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }
            nav a {
                display: block;
                padding: 15px;
            }
            .article-header h1 {
                font-size: 1.8rem;
            }
            .content-section {
                padding: 20px;
            }
            .interactive-section {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }
        @media (max-width: 480px) {
            .article-header h1 {
                font-size: 1.5rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .article-meta {
                flex-direction: column;
                align-items: center;
                gap: 10px;
            }
            .tier-table th, .tier-table td {
                padding: 10px;
            }
        }
        @media print {
            .menu-toggle, nav, .search-container, .interactive-section, 
            .web-links-container, footer, .back-to-top {
                display: none !important;
            }
            body {
                background: white;
                color: black;
                font-size: 12pt;
            }
            .container {
                max-width: 100%;
                padding: 0;
            }
            .content-section {
                box-shadow: none;
                border: 1px solid #ddd;
            }
        }