:root {
            --primary-color: #2a2e7a;
            --secondary-color: #ff6b00;
            --accent-color: #00c8ff;
            --light-color: #f8f9fa;
            --dark-color: #1a1a2e;
            --text-color: #333;
            --border-radius: 12px;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
            font-size: 16px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-color);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--dark-color), var(--primary-color));
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
        }
        .logo span {
            color: var(--accent-color);
        }
        .logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:hover {
            color: var(--accent-color);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-color);
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 5px;
            background: transparent;
            border: none;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background: white;
            border-radius: 2px;
            transition: var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(7px, -6px);
        }
        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }
            .main-nav ul {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background: var(--dark-color);
                flex-direction: column;
                align-items: center;
                padding: 2rem 0;
                gap: 1.5rem;
                transform: translateY(-150%);
                transition: transform 0.5s ease-in-out;
                box-shadow: 0 10px 20px rgba(0,0,0,0.2);
                z-index: 999;
            }
            .main-nav ul.active {
                transform: translateY(0);
            }
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: var(--light-color);
            border-bottom: 1px solid #eee;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--primary-color);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            color: #666;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 3rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        article {
            max-width: 100%;
        }
        .article-header {
            margin-bottom: 2.5rem;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
        }
        .article-meta {
            color: #666;
            font-size: 0.95rem;
            margin-bottom: 1.5rem;
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .article-meta i {
            margin-right: 0.5rem;
            color: var(--secondary-color);
        }
        .intro {
            font-size: 1.2rem;
            color: var(--dark-color);
            background: linear-gradient(to right, var(--light-color), #fff);
            padding: 2rem;
            border-radius: var(--border-radius);
            border-left: 5px solid var(--secondary-color);
            margin-bottom: 3rem;
            box-shadow: var(--shadow);
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-color);
            margin: 3rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid var(--secondary-color);
        }
        h3 {
            font-size: 1.5rem;
            color: var(--dark-color);
            margin: 2.5rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .highlight {
            background-color: #fff8e1;
            padding: 2rem;
            border-radius: var(--border-radius);
            border: 2px dashed var(--secondary-color);
            margin: 2rem 0;
            position: relative;
        }
        .highlight::before {
            content: "💡 Pro Tip";
            display: block;
            font-weight: bold;
            color: var(--secondary-color);
            margin-bottom: 0.5rem;
            font-size: 1.1rem;
        }
        .tier-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .tier-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border-top: 5px solid;
        }
        .tier-card:hover {
            transform: translateY(-5px);
        }
        .tier-card.s-tier { border-top-color: gold; }
        .tier-card.a-tier { border-top-color: silver; }
        .tier-card.b-tier { border-top-color: #cd7f32; }
        .tier-card h4 {
            margin-bottom: 0.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .featured-img {
            width: 100%;
            border-radius: var(--border-radius);
            margin: 2rem auto;
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
        }
        .btn {
            display: inline-block;
            padding: 0.8rem 1.8rem;
            background: var(--secondary-color);
            color: white;
            border-radius: 50px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            background: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        .sidebar {
            background: var(--light-color);
            padding: 2rem;
            border-radius: var(--border-radius);
            height: fit-content;
            box-shadow: var(--shadow);
        }
        .sidebar h3 {
            color: var(--primary-color);
            margin-top: 0;
        }
        .search-box {
            margin-bottom: 2rem;
        }
        .search-box input {
            width: 100%;
            padding: 1rem;
            border: 2px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-box input:focus {
            outline: none;
            border-color: var(--accent-color);
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget ul {
            list-style: none;
        }
        .sidebar-widget li {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px dotted #ccc;
        }
        .sidebar-widget li:last-child {
            border-bottom: none;
        }
        .interactive-section {
            background: white;
            padding: 2.5rem;
            border-radius: var(--border-radius);
            margin: 3rem 0;
            box-shadow: var(--shadow);
            border: 1px solid #eee;
        }
        .interactive-section h2 {
            border-bottom: none;
            margin-top: 0;
        }
        .rating-widget {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin: 1.5rem 0;
            flex-wrap: wrap;
        }
        .stars {
            display: flex;
            gap: 0.3rem;
        }
        .stars i {
            color: #ddd;
            font-size: 1.8rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .stars i.active,
        .stars i:hover {
            color: gold;
        }
        .comment-form textarea,
        .comment-form input {
            width: 100%;
            padding: 1rem;
            margin-bottom: 1rem;
            border: 2px solid #eee;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        .comment-form textarea:focus,
        .comment-form input:focus {
            outline: none;
            border-color: var(--accent-color);
        }
        .footer-links {
            background: var(--dark-color);
            padding: 3rem 0;
            margin-top: 3rem;
        }
        .web-links-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1.5rem;
        }
        .web-link {
            background: rgba(255,255,255,0.05);
            padding: 1.2rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .web-link:hover {
            background: rgba(255,255,255,0.1);
            transform: translateX(5px);
        }
        .web-link a {
            color: var(--accent-color);
            font-weight: 500;
            display: block;
        }
        .site-footer {
            background: #111;
            color: #aaa;
            padding: 2.5rem 0;
            text-align: center;
        }
        .footer-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1.5rem;
        }
        .social-links {
            display: flex;
            gap: 1.5rem;
            font-size: 1.5rem;
        }
        .social-links a {
            color: #aaa;
        }
        .social-links a:hover {
            color: var(--accent-color);
        }
        .copyright {
            font-size: 0.9rem;
            border-top: 1px solid #333;
            padding-top: 1.5rem;
            width: 100%;
        }