* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.7;
            max-width: 100vw;
            overflow-x: hidden;
        }
        a {
            color: #4a6ee0;
            text-decoration: none;
            transition: color 0.3s ease, transform 0.2s ease;
        }
        a:hover {
            color: #2a4bc9;
            transform: translateY(-1px);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #4a6ee0 100%);
            color: white;
            padding: 1.2rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(to right, #ffcc00, #ff9d00);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
            letter-spacing: -0.5px;
        }
        .my-logo:hover {
            transform: scale(1.02);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2.2rem;
        }
        .main-nav a {
            color: #e0e7ff;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 0.3rem;
            border-bottom: 2px solid transparent;
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: #ffcc00;
            border-bottom-color: #ffcc00;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 1rem 0;
            font-size: 0.95rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 0.7rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.7rem;
            color: #666;
        }
        .breadcrumb a {
            color: #555;
        }
        .breadcrumb a:hover {
            color: #1a237e;
        }
        .main-content-area {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 2.5rem;
            margin-bottom: 3rem;
        }
        @media (max-width: 992px) {
            .main-content-area {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid #eee;
            padding-bottom: 1.2rem;
            margin-bottom: 2rem;
            font-size: 0.95rem;
            color: #666;
        }
        .update-time {
            color: #1a237e;
            font-weight: 600;
        }
        .article-content h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            color: #1a237e;
            margin-bottom: 1.5rem;
            padding-bottom: 1rem;
            border-bottom: 3px solid #ffcc00;
        }
        .article-content h2 {
            font-size: 2rem;
            color: #283593;
            margin: 2.8rem 0 1.2rem;
            padding-top: 0.5rem;
            border-top: 1px solid #eee;
        }
        .article-content h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 2.2rem 0 1rem;
        }
        .article-content h4 {
            font-size: 1.3rem;
            color: #5c6bc0;
            margin: 1.8rem 0 0.8rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
            hyphens: auto;
        }
        .highlight-box {
            background: linear-gradient(to right, #e8eaf6, #f3e5f5);
            border-left: 5px solid #4a6ee0;
            padding: 1.8rem;
            border-radius: 0 8px 8px 0;
            margin: 2rem 0;
            box-shadow: 0 3px 10px rgba(0,0,0,0.04);
        }
        .featured-img {
            margin: 2.5rem auto;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
            border: 1px solid #ddd;
        }
        .keyword-link {
            background-color: #f0f4ff;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            border: 1px dashed #a0b3f0;
            font-weight: 600;
        }
        .keyword-link:hover {
            background-color: #e1e9ff;
        }
        blockquote {
            font-style: italic;
            color: #555;
            border-left: 4px solid #ffcc00;
            padding-left: 1.5rem;
            margin: 2rem 0 2rem 1.5rem;
            background-color: #fffdf0;
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background: white;
            border-radius: 12px;
            padding: 1.8rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        .sidebar-widget h3 {
            color: #1a237e;
            margin-bottom: 1.5rem;
            padding-bottom: 0.7rem;
            border-bottom: 2px solid #ffcc00;
            font-size: 1.5rem;
        }
        .search-form {
            display: flex;
        }
        .search-form input {
            flex-grow: 1;
            padding: 0.9rem 1.2rem;
            border: 2px solid #c5cae9;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
            outline: none;
            transition: border 0.3s;
        }
        .search-form input:focus {
            border-color: #4a6ee0;
        }
        .search-form button {
            background: linear-gradient(to right, #4a6ee0, #3a56c0);
            color: white;
            border: none;
            padding: 0 1.8rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: linear-gradient(to right, #3a56c0, #2a46a0);
        }
        .rating-widget .stars {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1.2rem;
            font-size: 1.8rem;
            color: #ffc107;
        }
        .rating-widget .stars i {
            cursor: pointer;
            transition: transform 0.2s;
        }
        .rating-widget .stars i:hover {
            transform: scale(1.2);
        }
        .rating-form button {
            width: 100%;
            padding: 0.9rem;
            background-color: #1a237e;
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        .rating-form button:hover {
            background-color: #0d153e;
        }
        .level-links ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
            gap: 0.8rem;
        }
        .level-links a {
            display: block;
            padding: 0.7rem 1rem;
            background-color: #f5f7fa;
            border-radius: 6px;
            text-align: center;
            font-size: 0.95rem;
            border: 1px solid #e0e0e0;
        }
        .level-links a:hover {
            background-color: #e8eaf6;
            border-color: #4a6ee0;
        }
        .comments-section {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            margin-bottom: 3rem;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
        }
        .comments-section h2 {
            color: #1a237e;
            margin-bottom: 2rem;
            padding-bottom: 0.8rem;
            border-bottom: 3px solid #ffcc00;
        }
        .comment-form {
            display: grid;
            gap: 1.2rem;
            margin-bottom: 3rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        .form-group label {
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #444;
        }
        .form-group input,
        .form-group textarea {
            padding: 0.9rem 1.2rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: #4a6ee0;
            outline: none;
        }
        .comment-form button {
            padding: 1rem 2rem;
            background: linear-gradient(135deg, #1a237e, #4a6ee0);
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            justify-self: start;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .comment-form button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(26, 35, 126, 0.25);
        }
        .site-footer {
            background: linear-gradient(135deg, #1a237e 0%, #0d153e 100%);
            color: #c5cae9;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-section h4 {
            color: #ffcc00;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #c5cae9;
        }
        .footer-links a:hover {
            color: #ffcc00;
            padding-left: 0.5rem;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.05);
            padding: 1.5rem;
            border-radius: 8px;
            border: 1px solid rgba(255,255,255,0.1);
            margin-top: 1rem;
        }
        friend-link a {
            color: #ffcc00;
            font-weight: 700;
            font-size: 1.1rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.95rem;
            color: #a0a7d0;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: #1a237e;
                padding: 1.5rem;
                box-shadow: 0 10px 20px rgba(0,0,0,0.2);
                border-top: 1px solid rgba(255,255,255,0.1);
            }
            .main-nav.active ul {
                display: flex;
            }
            .main-nav li {
                margin: 0.8rem 0;
            }
            .article-content {
                padding: 1.8rem;
            }
            .article-content h1 {
                font-size: 2.2rem;
            }
            .article-content h2 {
                font-size: 1.8rem;
            }
            .comments-section,
            .sidebar-widget {
                padding: 1.5rem;
            }
            .footer-content {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }
        @media print {
            .site-header, .sidebar, .comments-section, .site-footer,
            .breadcrumb, .search-form, .rating-form, .comment-form {
                display: none;
            }
            .article-content {
                box-shadow: none;
                padding: 0;
            }
            body {
                background: white;
                color: black;
            }
            a {
                color: black;
                text-decoration: underline;
            }
        }