:root {
            --primary-blue: #2a5c8a;
            --secondary-blue: #4a90e2;
            --accent-blue: #87ceeb;
            --dark-blue: #1a365d;
            --light-blue: #e6f2ff;
            --text-dark: #333;
            --text-light: #666;
            --background: #f9fbfd;
            --white: #ffffff;
            --shadow: rgba(42, 92, 138, 0.1);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: var(--background);
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 15px;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-blue);
            text-decoration: underline;
        }
        .site-header {
            background: linear-gradient(135deg, var(--dark-blue), var(--primary-blue));
            color: var(--white);
            padding: 1.5rem 0;
            box-shadow: 0 4px 12px 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;
            letter-spacing: 1px;
            background: linear-gradient(to right, #fff, var(--accent-blue));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none !important;
        }
        .my-logo:hover {
            text-decoration: none !important;
            opacity: 0.9;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: var(--white);
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
        }
        .main-nav a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: var(--text-light);
            border-bottom: 1px solid #eee;
            margin-bottom: 2rem;
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary-blue);
        }
        .breadcrumb span {
            margin: 0 8px;
            color: #aaa;
        }
        .content-container {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            .content-container {
                grid-template-columns: 1fr;
            }
        }
        main article {
            background: var(--white);
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px var(--shadow);
        }
        h1 {
            font-size: 2.8rem;
            color: var(--dark-blue);
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 6px solid var(--accent-blue);
            padding-left: 1rem;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-blue);
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--light-blue);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--secondary-blue);
            margin: 2rem 0 0.8rem;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--text-dark);
            margin: 1.5rem 0 0.5rem;
            font-weight: 600;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--text-dark);
            background-color: var(--light-blue);
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 4px solid var(--secondary-blue);
            margin-bottom: 2.5rem;
        }
        .highlight {
            background: linear-gradient(120deg, #e6f7ff 0%, #e6f7ff 100%);
            padding: 2rem;
            border-radius: 10px;
            border: 1px solid var(--accent-blue);
            margin: 2rem 0;
        }
        .tip {
            background-color: #f0f9ff;
            border-left: 5px solid #36c;
            padding: 1.2rem;
            margin: 1.5rem 0;
            font-style: italic;
        }
        strong {
            color: var(--dark-blue);
            font-weight: 700;
        }
        em {
            color: var(--text-light);
        }
        .content-link {
            font-weight: 600;
            border-bottom: 1px dotted var(--secondary-blue);
        }
        .content-link:hover {
            border-bottom: 2px solid var(--secondary-blue);
        }
        .featured-image {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: 10px;
            margin: 2rem 0;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            border: 1px solid #ddd;
        }
        aside {
            position: sticky;
            top: 120px;
            height: fit-content;
        }
        .sidebar-widget {
            background: var(--white);
            padding: 1.8rem;
            margin-bottom: 2rem;
            border-radius: 10px;
            box-shadow: 0 4px 12px var(--shadow);
        }
        .sidebar-widget h3 {
            font-size: 1.3rem;
            margin-top: 0;
            color: var(--dark-blue);
            border-bottom: 1px solid #eee;
            padding-bottom: 0.7rem;
        }
        .search-form {
            display: flex;
        }
        .search-form input {
            flex-grow: 1;
            padding: 0.8rem 1rem;
            border: 2px solid #ddd;
            border-right: none;
            border-radius: 6px 0 0 6px;
            font-size: 1rem;
        }
        .search-form button {
            background-color: var(--primary-blue);
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 6px 6px 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-form button:hover {
            background-color: var(--dark-blue);
        }
        .rating-container {
            text-align: center;
        }
        .stars {
            font-size: 1.8rem;
            color: #ffc107;
            margin: 0.5rem 0 1rem;
            cursor: pointer;
        }
        .stars span {
            margin: 0 2px;
            transition: var(--transition);
        }
        .stars span:hover {
            transform: scale(1.2);
        }
        .rating-form input,
        .comment-form input,
        .comment-form textarea {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-family: inherit;
        }
        .rating-form button,
        .comment-form button {
            width: 100%;
            padding: 0.9rem;
            background: linear-gradient(to right, var(--secondary-blue), var(--primary-blue));
            color: white;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-form button:hover,
        .comment-form button:hover {
            opacity: 0.9;
            transform: translateY(-2px);
        }
        .last-updated {
            text-align: right;
            font-size: 0.9rem;
            color: var(--text-light);
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px dashed #ccc;
        }
        footer {
            background-color: var(--dark-blue);
            color: var(--white);
            padding: 3rem 0 2rem;
            margin-top: 4rem;
            border-radius: 12px 12px 0 0;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer-section h3 {
            color: var(--accent-blue);
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #ccc;
        }
        .footer-links a:hover {
            color: var(--accent-blue);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 1rem;
            margin: 0.5rem 0;
            border-radius: 6px;
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(255,255,255,0.1);
        }
        .copyright {
            text-align: center;
            margin-top: 3rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                align-items: flex-start;
            }
            .main-nav {
                width: 100%;
                display: none;
                margin-top: 1rem;
            }
            .main-nav.active {
                display: block;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav li {
                width: 100%;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .main-nav a {
                display: block;
                padding: 0.8rem 0;
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 15px;
            }
            h1 {
                font-size: 2.2rem;
            }
            main article {
                padding: 1.5rem;
            }
            .content-container {
                gap: 2rem;
            }
        }