* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8f9fa;
            max-width: 1600px;
            margin: 0 auto;
            padding: 0 15px;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-weight: 700; line-height: 1.3; color: #1a365d; margin-bottom: 1rem; }
        h1 { font-size: 2.8rem; margin-top: 2rem; }
        h2 { font-size: 2.2rem; padding-top: 1.5rem; border-top: 3px solid #e2e8f0; margin-top: 3rem; }
        h3 { font-size: 1.8rem; color: #2d3748; }
        p { margin-bottom: 1.5rem; font-size: 1.125rem; }
        .lead { font-size: 1.4rem; color: #4a5568; font-weight: 500; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.5rem; border-radius: 4px; font-weight: 600; }
        .term { color: #2b6cb0; font-weight: bold; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .container { width: 100%; padding-right: 15px; padding-left: 15px; margin-right: auto; margin-left: auto; }
        @media (min-width: 1200px) { .container { max-width: 1140px; } }
        .site-header {
            background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
            color: white;
            padding: 1.5rem 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;
        }
        .logo a {
            color: white;
            text-decoration: none;
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
        }
        .logo-icon { color: #63b3ed; margin-right: 10px; font-size: 2.5rem; }
        .main-nav ul { display: flex; list-style: none; }
        .main-nav li { margin-left: 2rem; }
        .main-nav a {
            color: #cbd5e0;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 0;
            transition: color 0.3s;
            position: relative;
        }
        .main-nav a:hover, .main-nav a.active { color: white; }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: #63b3ed;
            transition: width 0.3s;
        }
        .main-nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        @media (max-width: 992px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 80px;
                left: 0;
                width: 100%;
                background-color: #1a365d;
                flex-direction: column;
                align-items: center;
                padding: 2rem;
                clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
                transition: clip-path 0.4s ease-in-out;
            }
            .main-nav.active {
                clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
            }
            .main-nav ul {
                flex-direction: column;
                width: 100%;
            }
            .main-nav li {
                margin: 1rem 0;
                text-align: center;
                width: 100%;
            }
            .main-nav a {
                display: block;
                padding: 1rem;
                border-bottom: 1px solid #2d3748;
            }
            .main-nav a::after { display: none; }
        }
        .breadcrumb {
            padding: 1rem 0;
            color: #718096;
            font-size: 0.95rem;
        }
        .breadcrumb a { color: #4299e1; text-decoration: none; }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb span { margin: 0 0.5rem; }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .featured-image {
            width: 100%;
            border-radius: 10px;
            margin: 2rem 0;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background: white;
            padding: 1.8rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .sidebar-widget h3 { font-size: 1.5rem; margin-bottom: 1.2rem; padding-bottom: 0.8rem; border-bottom: 2px solid #e2e8f0; }
        .search-form { display: flex; }
        .search-input {
            flex-grow: 1;
            padding: 0.9rem 1.2rem;
            border: 2px solid #cbd5e0;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.3s;
        }
        .search-input:focus { border-color: #4299e1; }
        .search-btn {
            background-color: #4299e1;
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background-color 0.3s;
        }
        .search-btn:hover { background-color: #3182ce; }
        .rating-widget { text-align: center; }
        .stars {
            font-size: 2rem;
            color: #e2e8f0;
            margin-bottom: 1rem;
            cursor: pointer;
        }
        .stars .star { margin: 0 0.2rem; transition: color 0.2s; }
        .stars .star:hover, .stars .star.active { color: #f6ad55; }
        .rating-text { font-size: 0.9rem; color: #718096; margin-top: 0.5rem; }
        .comment-form textarea {
            width: 100%;
            padding: 1rem;
            border: 2px solid #cbd5e0;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            margin-bottom: 1rem;
            resize: vertical;
            min-height: 120px;
            outline: none;
            transition: border-color 0.3s;
        }
        .comment-form textarea:focus { border-color: #4299e1; }
        .submit-btn {
            background-color: #48bb78;
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 8px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background-color 0.3s;
            width: 100%;
        }
        .submit-btn:hover { background-color: #38a169; }
        .web-links-section { margin: 3rem 0; }
        .web-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.2rem;
        }
        .web-link {
            background: white;
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .web-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.12);
        }
        .web-link a {
            color: #2b6cb0;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            display: block;
        }
        .web-link a:hover { text-decoration: underline; }
        .web-link p { font-size: 1rem; color: #4a5568; margin-bottom: 0; }
        .site-footer {
            background-color: #1a365d;
            color: #cbd5e0;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
            border-radius: 12px 12px 0 0;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo a {
            color: white;
            font-size: 1.8rem;
            font-weight: 800;
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2d3748;
            font-size: 0.95rem;
            color: #a0aec0;
        }
        .text-center { text-align: center; }
        .mt-4 { margin-top: 2rem; }
        .mb-4 { margin-bottom: 2rem; }
        .py-2 { padding-top: 1rem; padding-bottom: 1rem; }