:root {
            --primary: #2a4365;
            --secondary: #c53030;
            --accent: #d69e2e;
            --light: #f7fafc;
            --dark: #1a202c;
            --gray: #718096;
            --success: #38a169;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --radius: 8px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
        }
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
        }
        header {
            background: var(--primary);
            color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--accent);
        }
        .desktop-nav {
            display: flex;
            gap: 2rem;
        }
        .desktop-nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
        }
        .desktop-nav a:hover {
            background: rgba(255, 255, 255, 0.1);
            color: var(--accent);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 4px;
            cursor: pointer;
            padding: 0.5rem;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background: white;
            border-radius: 2px;
            transition: 0.3s;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: var(--primary);
            padding: 1rem;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            box-shadow: var(--shadow);
        }
        .mobile-nav.active {
            display: flex;
        }
        .breadcrumb {
            background: var(--light);
            padding: 1rem 2rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 0.5rem;
            max-width: 1200px;
            margin: 0 auto;
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
        }
        .content-area {
            background: white;
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: white;
            border-radius: var(--radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            height: fit-content;
            position: sticky;
            top: 100px;
        }
        article {
            margin-bottom: 3rem;
        }
        h1 {
            color: var(--primary);
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid var(--accent);
            padding-bottom: 1rem;
        }
        h2 {
            color: var(--primary);
            font-size: 1.8rem;
            margin: 2rem 0 1rem;
            padding: 0.5rem 0;
            border-bottom: 2px solid #e2e8f0;
        }
        h3 {
            color: var(--secondary);
            font-size: 1.4rem;
            margin: 1.5rem 0 0.8rem;
        }
        h4 {
            color: var(--dark);
            font-size: 1.1rem;
            margin: 1rem 0 0.5rem;
            font-weight: 600;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .highlight {
            background: linear-gradient(120deg, #f0fff4 0%, #c6f6d5 100%);
            border-left: 4px solid var(--success);
            padding: 1.5rem;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 1.5rem 0;
        }
        .code-block {
            background: var(--dark);
            color: white;
            padding: 1.5rem;
            border-radius: var(--radius);
            font-family: 'Courier New', monospace;
            margin: 1rem 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .copy-btn {
            background: var(--accent);
            color: white;
            border: none;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            cursor: pointer;
            transition: background 0.3s;
        }
        .copy-btn:hover {
            background: #b7791f;
        }
        .reward-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
            margin: 2rem 0;
        }
        .reward-card {
            background: white;
            border: 2px solid #e2e8f0;
            border-radius: var(--radius);
            padding: 1.5rem;
            text-align: center;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .reward-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .reward-card i {
            font-size: 2rem;
            color: var(--accent);
            margin-bottom: 1rem;
        }
        .search-box {
            background: var(--light);
            padding: 1.5rem;
            border-radius: var(--radius);
            margin: 2rem 0;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
        }
        .search-form input {
            flex: 1;
            padding: 0.8rem;
            border: 2px solid #cbd5e0;
            border-radius: var(--radius);
            font-size: 1rem;
        }
        .search-form button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: var(--radius);
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: #1a365d;
        }
        .interaction-section {
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 2px solid #e2e8f0;
        }
        .rating-box {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 2rem;
        }
        .stars {
            display: flex;
            gap: 0.5rem;
        }
        .star {
            color: #cbd5e0;
            cursor: pointer;
            font-size: 1.5rem;
            transition: color 0.3s;
        }
        .star.active {
            color: var(--accent);
        }
        .comment-form {
            display: grid;
            gap: 1rem;
            margin-top: 2rem;
        }
        .comment-form input,
        .comment-form textarea {
            padding: 0.8rem;
            border: 2px solid #cbd5e0;
            border-radius: var(--radius);
            font-size: 1rem;
        }
        .comment-form textarea {
            min-height: 120px;
            resize: vertical;
        }
        .comment-form button {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 1rem;
            border-radius: var(--radius);
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.3s;
        }
        .comment-form button:hover {
            background: #9b2c2c;
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 3rem 2rem 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin: 1rem 0;
        }
        .friend-links a {
            color: var(--accent);
            text-decoration: none;
            background: rgba(255,255,255,0.1);
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
            transition: background 0.3s;
        }
        .friend-links a:hover {
            background: rgba(255,255,255,0.2);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #4a5568;
            color: #a0aec0;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            main {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                padding: 1rem;
            }
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            main {
                padding: 0 1rem;
            }
            .content-area {
                padding: 1.5rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .reward-grid {
                grid-template-columns: 1fr;
            }
        }
        .last-updated {
            color: var(--gray);
            font-style: italic;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .info-box {
            background: #ebf8ff;
            border-left: 4px solid #4299e1;
            padding: 1rem;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 1rem 0;
        }
        .related-links {
            margin: 1.5rem 0;
            padding: 1rem;
            background: #f7fafc;
            border-radius: var(--radius);
        }
        .related-links a {
            color: var(--primary);
            text-decoration: none;
            margin-right: 1rem;
            display: inline-block;
            margin-bottom: 0.5rem;
        }
        .related-links a:hover {
            text-decoration: underline;
        }
        .table-of-contents {
            background: var(--light);
            padding: 1.5rem;
            border-radius: var(--radius);
            margin: 2rem 0;
        }
        .toc-list {
            list-style: none;
            padding-left: 1rem;
        }
        .toc-list li {
            margin: 0.5rem 0;
        }
        .toc-list a {
            color: var(--primary);
            text-decoration: none;
        }
        .toc-list a:hover {
            text-decoration: underline;
            color: var(--secondary);
        }
        .warning {
            background: #fff5f5;
            border-left: 4px solid var(--secondary);
            padding: 1rem;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 1rem 0;
        }
        .exclusive-badge {
            display: inline-block;
            background: linear-gradient(45deg, var(--accent), #ed8936);
            color: white;
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: bold;
            margin-left: 0.5rem;
            vertical-align: middle;
        }