:root {
            --primary-dark: #1a1a2e;
            --primary-accent: #6a11cb;
            --secondary-accent: #2575fc;
            --highlight: #ffd166;
            --text-light: #f8f9fa;
            --text-gray: #adb5bd;
            --bg-section: #16213e;
            --border-color: #2d4059;
            --success: #06d6a0;
            --warning: #ff9e00;
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 2rem;
            --spacing-lg: 3rem;
            --spacing-xl: 5rem;
            --border-radius: 8px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-light);
            background: linear-gradient(135deg, var(--primary-dark) 0%, #16213e 100%);
            min-height: 100vh;
            overflow-x: hidden;
        }
        a {
            color: var(--highlight);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-accent);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--spacing-sm);
        }
        .btn {
            display: inline-block;
            padding: 0.8rem 1.5rem;
            background: linear-gradient(to right, var(--primary-accent), var(--secondary-accent));
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 25px rgba(106, 17, 203, 0.5);
            text-decoration: none;
        }
        section {
            padding: var(--spacing-lg) 0;
            border-bottom: 1px solid var(--border-color);
        }
        header {
            background-color: rgba(22, 33, 62, 0.95);
            backdrop-filter: blur(10px);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.5);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--spacing-sm) 0;
        }
        .my-logo {
            font-family: 'Arial Black', sans-serif;
            font-size: 2.2rem;
            background: linear-gradient(to right, #ffd166, #ff9e00);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none;
            letter-spacing: 1px;
        }
        .my-logo:hover {
            text-decoration: none;
            color: transparent;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: var(--spacing-md);
        }
        .main-nav a {
            color: var(--text-light);
            font-weight: 600;
            padding: 0.5rem;
            border-radius: var(--border-radius);
        }
        .main-nav a:hover {
            background-color: rgba(106, 17, 203, 0.2);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--highlight);
        }
        .breadcrumb {
            padding: var(--spacing-sm) 0;
            font-size: 0.9rem;
            color: var(--text-gray);
            background-color: rgba(255,255,255,0.05);
            margin-bottom: var(--spacing-md);
        }
        .breadcrumb a {
            color: var(--text-gray);
        }
        .breadcrumb a:hover {
            color: var(--highlight);
        }
        .hero {
            text-align: center;
            padding: var(--spacing-xl) 0;
            background: radial-gradient(circle at center, rgba(37, 117, 252, 0.15) 0%, transparent 70%);
        }
        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: var(--spacing-md);
            background: linear-gradient(to right, #ffd166, #ff9e00);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            line-height: 1.2;
        }
        .hero-subtitle {
            font-size: 1.3rem;
            color: var(--text-gray);
            max-width: 800px;
            margin: 0 auto var(--spacing-lg);
        }
        .last-updated {
            display: inline-block;
            background-color: rgba(6, 214, 160, 0.2);
            color: var(--success);
            padding: 0.5rem 1rem;
            border-radius: 50px;
            font-size: 0.9rem;
            margin-top: var(--spacing-md);
        }
        h2 {
            font-size: 2.5rem;
            margin-bottom: var(--spacing-md);
            color: var(--highlight);
            border-left: 5px solid var(--primary-accent);
            padding-left: var(--spacing-sm);
        }
        h3 {
            font-size: 2rem;
            margin: var(--spacing-md) 0 var(--spacing-sm);
            color: #ff9e00;
        }
        h4 {
            font-size: 1.5rem;
            margin: var(--spacing-sm) 0;
            color: var(--secondary-accent);
        }
        p {
            margin-bottom: 1.2rem;
            font-size: 1.1rem;
            color: #e9ecef;
        }
        .content-block {
            margin-bottom: var(--spacing-lg);
            padding: var(--spacing-md);
            background-color: rgba(255, 255, 255, 0.05);
            border-radius: var(--border-radius);
            border-left: 4px solid var(--primary-accent);
        }
        .highlight-box {
            background: linear-gradient(to right, rgba(106, 17, 203, 0.2), rgba(37, 117, 252, 0.2));
            padding: var(--spacing-md);
            border-radius: var(--border-radius);
            border: 1px solid var(--border-color);
            margin: var(--spacing-md) 0;
        }
        .key-term {
            color: var(--highlight);
            font-weight: bold;
        }
        ul, ol {
            padding-left: 2rem;
            margin-bottom: 1.2rem;
            color: #e9ecef;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .feature-img {
            width: 100%;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin: var(--spacing-md) auto;
            border: 2px solid var(--border-color);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--text-gray);
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .inline-link {
            font-weight: 600;
            border-bottom: 1px dashed var(--highlight);
        }
        .search-box {
            display: flex;
            max-width: 500px;
            margin: var(--spacing-md) 0;
        }
        .search-box input {
            flex-grow: 1;
            padding: 0.9rem;
            border: 2px solid var(--border-color);
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            background-color: rgba(255,255,255,0.1);
            color: var(--text-light);
            font-size: 1rem;
        }
        .search-box button {
            background: linear-gradient(to right, var(--primary-accent), var(--secondary-accent));
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            font-size: 1.1rem;
        }
        .rating-section, .comment-section {
            background-color: rgba(22, 33, 62, 0.7);
            padding: var(--spacing-md);
            border-radius: var(--border-radius);
            margin: var(--spacing-lg) 0;
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            margin: var(--spacing-sm) 0;
        }
        .star-rating i {
            color: var(--text-gray);
            font-size: 1.8rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating i:hover, .star-rating i.active {
            color: var(--highlight);
        }
        .rating-form, .comment-form {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
            margin-top: var(--spacing-sm);
        }
        .rating-form input, .comment-form input, .comment-form textarea {
            padding: 0.9rem;
            border: 2px solid var(--border-color);
            border-radius: var(--border-radius);
            background-color: rgba(255,255,255,0.1);
            color: var(--text-light);
            font-size: 1rem;
            font-family: inherit;
        }
        .comment-form textarea {
            min-height: 150px;
            resize: vertical;
        }
        .user-comments {
            margin-top: var(--spacing-lg);
        }
        .comment {
            background-color: rgba(255,255,255,0.05);
            padding: var(--spacing-sm);
            border-radius: var(--border-radius);
            margin-bottom: var(--spacing-sm);
            border-left: 3px solid var(--secondary-accent);
        }
        .comment-author {
            font-weight: bold;
            color: var(--highlight);
        }
        .comment-date {
            font-size: 0.8rem;
            color: var(--text-gray);
        }
        footer {
            background-color: #0d1529;
            padding: var(--spacing-xl) 0 var(--spacing-md);
            margin-top: var(--spacing-xl);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: var(--spacing-lg);
            margin-bottom: var(--spacing-lg);
        }
        .footer-logo {
            font-size: 2rem;
            margin-bottom: var(--spacing-sm);
        }
        .footer-section h4 {
            color: var(--highlight);
            margin-bottom: var(--spacing-sm);
            font-size: 1.3rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.7rem;
        }
        .footer-links a {
            color: var(--text-gray);
        }
        friend-link {
            display: block;
            margin: 0.5rem 0;
        }
        .copyright {
            text-align: center;
            padding-top: var(--spacing-md);
            border-top: 1px solid var(--border-color);
            color: var(--text-gray);
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .hero h1 { font-size: 2.8rem; }
            h2 { font-size: 2.2rem; }
            h3 { font-size: 1.8rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 80px);
                background-color: var(--bg-section);
                flex-direction: column;
                padding: var(--spacing-lg);
                transition: var(--transition);
                overflow-y: auto;
            }
            .main-nav.active {
                left: 0;
            }
            .main-nav ul {
                flex-direction: column;
                gap: var(--spacing-sm);
            }
            .hero h1 { font-size: 2.3rem; }
            .hero-subtitle { font-size: 1.1rem; }
            h2 { font-size: 2rem; }
            h3 { font-size: 1.6rem; }
            section { padding: var(--spacing-md) 0; }
            .header-container { padding: var(--spacing-xs) 0; }
        }
        @media (max-width: 480px) {
            .hero h1 { font-size: 1.9rem; }
            .btn { padding: 0.7rem 1.2rem; }
            .search-box { flex-direction: column; }
            .search-box input, .search-box button { border-radius: var(--border-radius); width: 100%; }
            .search-box button { margin-top: 0.5rem; padding: 0.9rem; }
        }