:root {
            --primary-blue: #1e3a8a;
            --accent-blue: #3b82f6;
            --light-blue: #dbeafe;
            --deep-blue: #0f172a;
            --warm-yellow: #f59e0b;
            --neutral-white: #f8fafc;
            --neutral-gray: #64748b;
            --text-dark: #1e293b;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --radius: 8px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: var(--neutral-white);
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 20px;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--warm-yellow);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        .site-header {
            background: linear-gradient(135deg, var(--deep-blue) 0%, var(--primary-blue) 100%);
            color: white;
            padding: 1.5rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--warm-yellow);
        }
        .my-logo:hover {
            transform: scale(1.03);
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: var(--neutral-gray);
        }
        .breadcrumb a {
            color: var(--neutral-gray);
        }
        .breadcrumb a:hover {
            color: var(--primary-blue);
        }
        .nav-container {
            display: flex;
            align-items: center;
        }
        .main-nav {
            display: flex;
            gap: 2rem;
        }
        .main-nav a {
            color: var(--light-blue);
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
        }
        .main-nav a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            color: white;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .search-container {
            background-color: var(--light-blue);
            padding: 2.5rem;
            border-radius: var(--radius);
            margin: 2rem 0;
            text-align: center;
        }
        .search-form {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
            gap: 10px;
        }
        .search-input {
            flex-grow: 1;
            padding: 1rem 1.5rem;
            border: 2px solid var(--accent-blue);
            border-radius: 50px;
            font-size: 1rem;
        }
        .search-btn {
            background-color: var(--primary-blue);
            color: white;
            border: none;
            border-radius: 50px;
            padding: 1rem 2rem;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .search-btn:hover {
            background-color: var(--deep-blue);
            transform: translateY(-2px);
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .article-header {
            border-bottom: 3px solid var(--light-blue);
            padding-bottom: 2rem;
            margin-bottom: 2.5rem;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--deep-blue);
            line-height: 1.2;
            margin-bottom: 1rem;
        }
        .article-meta {
            display: flex;
            gap: 2rem;
            color: var(--neutral-gray);
            font-size: 0.95rem;
        }
        h2 {
            color: var(--primary-blue);
            font-size: 2rem;
            margin: 2.5rem 0 1.2rem;
            padding-top: 1rem;
            border-top: 2px solid var(--light-blue);
        }
        h3 {
            color: var(--accent-blue);
            font-size: 1.6rem;
            margin: 2rem 0 1rem;
        }
        h4 {
            color: var(--neutral-gray);
            font-size: 1.3rem;
            margin: 1.8rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .highlight-box {
            background-color: var(--light-blue);
            border-left: 5px solid var(--accent-blue);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .img-container {
            margin: 2.5rem auto;
            max-width: 800px;
            text-align: center;
        }
        .featured-img {
            border-radius: var(--radius);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            transition: var(--transition);
        }
        .featured-img:hover {
            transform: scale(1.01);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
        }
        .img-caption {
            font-style: italic;
            color: var(--neutral-gray);
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        .related-links {
            background-color: #f1f5f9;
            padding: 1.5rem;
            border-radius: var(--radius);
            margin: 2rem 0;
        }
        .related-links h4 {
            margin-top: 0;
        }
        .related-links ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
        }
        .related-links li {
            background: white;
            padding: 0.7rem 1.2rem;
            border-radius: 50px;
            border: 1px solid #cbd5e1;
        }
        .keyword {
            background-color: #e0f2fe;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
        }
        em {
            color: var(--primary-blue);
            font-style: normal;
            font-weight: 600;
        }
        .sidebar {
            background: white;
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 140px;
        }
        .sidebar-section {
            margin-bottom: 2.5rem;
        }
        .sidebar h3 {
            color: var(--deep-blue);
            font-size: 1.4rem;
            border-bottom: 2px solid var(--light-blue);
            padding-bottom: 0.7rem;
            margin-top: 0;
        }
        .rating-widget {
            text-align: center;
        }
        .stars {
            font-size: 2rem;
            color: #fbbf24;
            margin: 1rem 0;
        }
        .stars i {
            cursor: pointer;
            transition: var(--transition);
        }
        .stars i:hover {
            transform: scale(1.2);
        }
        .rating-form input, .comment-form textarea, .comment-form input {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid #cbd5e1;
            border-radius: var(--radius);
        }
        .rating-form button, .comment-form button {
            background-color: var(--primary-blue);
            color: white;
            border: none;
            padding: 0.9rem 1.5rem;
            border-radius: var(--radius);
            cursor: pointer;
            width: 100%;
            font-weight: 600;
            transition: var(--transition);
        }
        .rating-form button:hover, .comment-form button:hover {
            background-color: var(--deep-blue);
        }
        .site-footer {
            background-color: var(--deep-blue);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
            border-radius: var(--radius) var(--radius) 0 0;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer-section h4 {
            color: var(--warm-yellow);
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #cbd5e1;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.05);
            padding: 1rem;
            border-radius: var(--radius);
            margin-bottom: 1rem;
            border-left: 3px solid var(--accent-blue);
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #334155;
            color: #94a3b8;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            body {
                padding: 0 15px;
            }
            .header-container {
                flex-direction: column;
                align-items: flex-start;
                gap: 1.5rem;
            }
            .nav-container {
                width: 100%;
                justify-content: space-between;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                gap: 0;
                background-color: var(--primary-blue);
                border-radius: var(--radius);
                overflow: hidden;
                margin-top: 1rem;
            }
            .main-nav.active {
                display: flex;
            }
            .main-nav a {
                padding: 1rem 1.5rem;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            .search-form {
                flex-direction: column;
            }
            .search-input, .search-btn {
                width: 100%;
            }
            .article-content {
                padding: 1.5rem;
            }
            .footer-container {
                flex-direction: column;
            }
        }