* {
            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: #f5f7fa;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }
        ul, ol {
            list-style-position: inside;
            margin-left: 1rem;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .highlight {
            background-color: #fffacd;
            padding: 2px 5px;
            border-radius: 3px;
        }
        .emoji { font-size: 1.2em; }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #311b92 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-family: 'Arial Black', sans-serif;
            font-size: 2rem;
            color: #FFD700;
            text-shadow: 2px 2px 0 #FF4500;
            letter-spacing: 1px;
        }
        .my-logo span {
            color: #00FFFF;
        }
        .main-nav ul {
            display: flex;
            gap: 2rem;
        }
        .main-nav a {
            padding: 0.5rem 1rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .main-nav a:hover,
        .main-nav a:focus {
            background-color: rgba(255, 255, 255, 0.15);
            color: #FFD700;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 0.8rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '>';
            margin: 0 10px;
            color: #666;
        }
        .breadcrumb a:hover {
            color: #1a237e;
            text-decoration: underline;
        }
        .search-section {
            background-color: #3949ab;
            padding: 1.5rem 0;
        }
        .search-form {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        .search-input {
            flex-grow: 1;
            padding: 15px 25px;
            border: none;
            font-size: 1rem;
        }
        .search-button {
            background-color: #FF9800;
            color: white;
            border: none;
            padding: 0 30px;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-button:hover {
            background-color: #F57C00;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.07);
        }
        .sidebar {
            background: white;
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.07);
            align-self: start;
            position: sticky;
            top: 150px;
        }
        .sidebar h3 {
            color: #1a237e;
            border-bottom: 2px solid #FFD700;
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
        }
        .sidebar ul {
            list-style: none;
            margin-left: 0;
        }
        .sidebar li {
            margin-bottom: 0.8rem;
        }
        .sidebar a {
            color: #555;
            display: block;
            padding: 0.5rem;
            border-radius: 5px;
        }
        .sidebar a:hover {
            background-color: #f0f4ff;
            color: #1a237e;
            padding-left: 1rem;
        }
        h1 {
            color: #1a237e;
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        h2 {
            color: #311b92;
            font-size: 2rem;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #FF9800;
        }
        h3 {
            color: #3949ab;
            font-size: 1.6rem;
            margin: 2rem 0 1rem;
        }
        h4 {
            color: #5c6bc0;
            font-size: 1.3rem;
            margin: 1.5rem 0 0.8rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .intro {
            font-size: 1.2rem;
            color: #444;
            background-color: #f0f7ff;
            padding: 1.5rem;
            border-left: 5px solid #3949ab;
            border-radius: 0 8px 8px 0;
            margin-bottom: 2rem;
        }
        .update-time {
            display: inline-block;
            background-color: #e8f5e9;
            color: #2e7d32;
            padding: 0.3rem 1rem;
            border-radius: 20px;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .article-image {
            margin: 2.5rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
            max-width: 800px;
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 0.5rem;
            background-color: #f9f9f9;
        }
        .content-link {
            color: #1a73e8;
            font-weight: 600;
            border-bottom: 1px dotted #1a73e8;
        }
        .content-link:hover {
            color: #0d47a1;
            border-bottom-style: solid;
        }
        .tip-box {
            background-color: #e3f2fd;
            border-left: 5px solid #2196F3;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .warning-box {
            background-color: #ffebee;
            border-left: 5px solid #f44336;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .user-interaction {
            background-color: #f8f9fa;
            border-radius: 12px;
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid #dee2e6;
        }
        .rating-section, .comment-section {
            margin-bottom: 2.5rem;
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
        }
        .stars i:hover,
        .stars i:hover ~ i {
            color: #ddd !important;
        }
        .stars i.active {
            color: #FFD700;
        }
        .comment-form textarea {
            width: 100%;
            padding: 1rem;
            border: 1px solid #ccc;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            resize: vertical;
            min-height: 120px;
            margin-bottom: 1rem;
        }
        .form-row {
            display: flex;
            gap: 1rem;
            margin-bottom: 1rem;
        }
        .form-row input {
            flex: 1;
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 8px;
        }
        .submit-btn {
            background: linear-gradient(to right, #1a237e, #311b92);
            color: white;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            transition: transform 0.2s;
        }
        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .site-footer {
            background-color: #1a1a2e;
            color: #ccc;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer-section h4 {
            color: #FFD700;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        friend-link {
            display: block;
            color: #8ab4f8;
            margin-bottom: 0.8rem;
        }
        friend-link:hover {
            color: #FFD700;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #333;
            font-size: 0.9rem;
            color: #888;
            width: 100%;
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .main-nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background-color: #1a237e;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1rem;
                box-shadow: 0 10px 15px rgba(0,0,0,0.2);
            }
            .main-nav.active ul {
                display: flex;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .article-content {
                padding: 1.5rem;
            }
            .form-row {
                flex-direction: column;
            }
        }