* { 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;
            background-image: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            max-width: 120rem;
            margin: 0 auto;
            padding: 0 1rem;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-family: 'Trebuchet MS', 'Lucida Sans Unicode', Arial, sans-serif; color: #1a365d; margin-bottom: 1rem; line-height: 1.3; }
        h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); margin-top: 1.5rem; border-bottom: 4px solid #2b6cb0; padding-bottom: 0.5rem; }
        h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-top: 2.5rem; padding-left: 0.75rem; border-left: 5px solid #4299e1; }
        h3 { font-size: clamp(1.5rem, 3.5vw, 2rem); margin-top: 2rem; color: #2d3748; }
        h4 { font-size: 1.3rem; margin-top: 1.5rem; color: #4a5568; }
        p { margin-bottom: 1.25rem; text-align: justify; hyphens: auto; }
        a { color: #2b6cb0; text-decoration: none; transition: color 0.3s ease, background-color 0.3s ease; }
        a:hover { color: #1a202c; text-decoration: underline; }
        strong { color: #2d3748; font-weight: 700; }
        em { font-style: italic; color: #555; }
        .highlight { background: linear-gradient(120deg, #a3bffa 0%, #7f9cf5 100%); padding: 0.2rem 0.5rem; border-radius: 3px; font-weight: 600; }
        blockquote {
            border-left: 4px solid #4299e1;
            padding: 1rem 1.5rem;
            margin: 2rem 0;
            background-color: #ebf8ff;
            font-style: italic;
            border-radius: 0 0.5rem 0.5rem 0;
        }
        .container {
            display: grid;
            grid-template-columns: 1fr;
            grid-template-areas:
                "header"
                "nav"
                "breadcrumb"
                "main"
                "sidebar"
                "footer";
            gap: 1.5rem;
        }
        @media (min-width: 992px) {
            .container {
                grid-template-columns: 3fr 1fr;
                grid-template-areas:
                    "header header"
                    "nav nav"
                    "breadcrumb breadcrumb"
                    "main sidebar"
                    "footer footer";
            }
        }
        header { grid-area: header; padding: 1.5rem 0; text-align: center; border-bottom: 1px solid #cbd5e0; }
        .logo-wrapper { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 1rem; }
        .my-logo {
            font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
            font-size: 2.8rem;
            background: linear-gradient(to right, #1a365d, #2b6cb0);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: 1px;
            text-decoration: none;
        }
        .my-logo:hover { text-decoration: none; transform: scale(1.02); }
        .site-url { font-size: 1rem; color: #718096; margin-top: 0.5rem; }
        nav { grid-area: nav; background-color: #1a365d; border-radius: 8px; }
        .nav-container { display: flex; justify-content: space-between; align-items: center; padding: 0 1rem; }
        .nav-links { display: flex; flex-wrap: wrap; list-style: none; }
        .nav-links li { position: relative; }
        .nav-links a {
            color: #e2e8f0;
            padding: 1rem 1.25rem;
            display: block;
            text-decoration: none;
            font-weight: 500;
        }
        .nav-links a:hover, .nav-links a:focus { background-color: #2b6cb0; color: white; border-radius: 4px; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-links {
                flex-direction: column;
                width: 100%;
                position: absolute;
                top: 100%;
                left: 0;
                background-color: #2d3748;
                border-radius: 0 0 8px 8px;
                display: none;
                z-index: 1000;
            }
            .nav-links.active { display: flex; }
            .nav-links li { width: 100%; text-align: center; }
            .nav-links a { padding: 1rem; border-bottom: 1px solid #4a5568; }
        }
        .breadcrumb { grid-area: breadcrumb; padding: 0.75rem 1rem; background-color: #edf2f7; border-radius: 5px; font-size: 0.9rem; }
        .breadcrumb a { color: #4a5568; }
        .breadcrumb a:hover { color: #1a365d; }
        .breadcrumb span { color: #718096; }
        main { grid-area: main; background-color: white; padding: 2rem; border-radius: 10px; box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05); }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            padding-bottom: 1rem;
            margin-bottom: 2rem;
            border-bottom: 2px dashed #e2e8f0;
            color: #718096;
            font-size: 0.9rem;
        }
        .update-time i { color: #38a169; margin-right: 0.5rem; }
        .featured-img {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: 8px;
            margin: 2rem 0;
            border: 1px solid #e2e8f0;
        }
        .content-section { margin-bottom: 3rem; }
        .tips-box {
            background: linear-gradient(to bottom right, #fef3c7, #fde68a);
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 5px solid #d97706;
            margin: 1.5rem 0;
        }
        .related-links { background-color: #f7fafc; padding: 1.5rem; border-radius: 8px; margin: 2rem 0; }
        .related-links h4 { margin-top: 0; }
        .related-links ul { list-style-position: inside; columns: 2; }
        .related-links li { margin-bottom: 0.5rem; break-inside: avoid; }
        @media (max-width: 768px) {
            .related-links ul { columns: 1; }
        }
        aside { grid-area: sidebar; }
        .sidebar-widget {
            background-color: white;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
        }
        .sidebar-widget h3 { font-size: 1.3rem; margin-top: 0; border-bottom: 2px solid #e2e8f0; padding-bottom: 0.5rem; }
        .search-form, .comment-form, .rating-form { display: flex; flex-direction: column; gap: 0.75rem; }
        input, textarea, select {
            padding: 0.75rem;
            border: 1px solid #cbd5e0;
            border-radius: 5px;
            font-family: inherit;
            font-size: 1rem;
        }
        input:focus, textarea:focus, select:focus { outline: none; border-color: #4299e1; box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2); }
        button {
            padding: 0.75rem 1.5rem;
            background: linear-gradient(to right, #2b6cb0, #4299e1);
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        button:hover { background: linear-gradient(to right, #2c5282, #3182ce); transform: translateY(-2px); box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1); }
        .stars { display: flex; justify-content: space-around; font-size: 1.8rem; color: #cbd5e0; margin: 0.5rem 0; }
        .stars i { cursor: pointer; transition: color 0.2s; }
        .stars i:hover, .stars i.active { color: #f6ad55; }
        footer { grid-area: footer; background-color: #1a202c; color: #cbd5e0; padding: 2.5rem 1.5rem; border-radius: 8px; margin-top: 2rem; }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .friend-links-section h4, .copyright-section h4 { color: #e2e8f0; margin-bottom: 1rem; }
        .friend-links { display: flex; flex-wrap: wrap; gap: 1rem; list-style: none; }
        .friend-links a {
            background-color: #2d3748;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            color: #90cdf4;
            text-decoration: none;
        }
        .friend-links a:hover { background-color: #4a5568; color: white; }
        .copyright-section { border-top: 1px solid #4a5568; padding-top: 1.5rem; text-align: center; font-size: 0.9rem; }
        .copyright-section p { margin-bottom: 0.5rem; }
        .text-center { text-align: center; }
        .mb-3 { margin-bottom: 1rem; }
        .emoji { font-size: 1.2em; vertical-align: middle; }