* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-blue: #1a73e8;
            --primary-purple: #7b1fa2;
            --dark-bg: #0f1419;
            --content-bg: #ffffff;
            --card-bg: #f8f9fa;
            --text-primary: #202124;
            --text-secondary: #5f6368;
            --accent-green: #0f9d58;
            --accent-orange: #ff9800;
            --border-color: #dadce0;
            --shadow-light: 0 2px 10px rgba(0,0,0,0.08);
            --shadow-medium: 0 4px 20px rgba(0,0,0,0.12);
            --max-content-width: 1200px;
            --header-height: 70px;
            --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
        }
        body {
            font-family: var(--font-main);
            line-height: 1.7;
            color: var(--text-primary);
            background-color: #f5f7fa;
            overflow-x: hidden;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--primary-purple);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: var(--max-content-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .btn {
            display: inline-block;
            padding: 12px 28px;
            background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-align: center;
        }
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
            text-decoration: none;
            color: white;
        }
        .section-spacing {
            padding: 60px 0;
        }
        .card {
            background: var(--card-bg);
            border-radius: 12px;
            padding: 30px;
            box-shadow: var(--shadow-light);
            margin-bottom: 30px;
            border: 1px solid var(--border-color);
        }
        .site-header {
            background: var(--dark-bg);
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: var(--header-height);
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(90deg, #00c6ff, #0072ff);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
        }
        .my-logo a {
            color: inherit;
            text-decoration: none;
        }
        .nav-desktop {
            display: flex;
            gap: 35px;
        }
        @media (max-width: 1024px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            color: #e8eaed;
            font-weight: 500;
            position: relative;
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-blue);
            transition: width 0.3s ease;
        }
        .nav-desktop a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 10px;
        }
        @media (max-width: 1024px) {
            .hamburger {
                display: block;
            }
        }
        .nav-mobile {
            position: fixed;
            top: var(--header-height);
            left: 0;
            width: 100%;
            background: var(--dark-bg);
            padding: 20px;
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: all 0.4s ease;
            z-index: 999;
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .nav-mobile.active {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }
        .nav-mobile a {
            display: block;
            color: #e8eaed;
            padding: 15px 0;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            font-size: 1.1rem;
        }
        .breadcrumb {
            padding: 20px 0;
            background: var(--card-bg);
            border-bottom: 1px solid var(--border-color);
            font-size: 0.95rem;
        }
        .breadcrumb a {
            color: var(--text-secondary);
        }
        .breadcrumb a:hover {
            color: var(--primary-blue);
        }
        .search-container {
            max-width: 600px;
            margin: 30px auto 40px;
        }
        .search-form {
            display: flex;
            background: white;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: var(--shadow-light);
            border: 1px solid var(--border-color);
        }
        .search-input {
            flex: 1;
            padding: 18px 25px;
            border: none;
            font-size: 1.05rem;
            outline: none;
        }
        .search-btn {
            background: var(--primary-blue);
            color: white;
            border: none;
            padding: 0 30px;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background 0.3s ease;
        }
        .search-btn:hover {
            background: var(--primary-purple);
        }
        .main-content {
            background: var(--content-bg);
            padding: 40px 0;
            min-height: 80vh;
        }
        .article-header {
            text-align: center;
            margin-bottom: 50px;
            padding-bottom: 30px;
            border-bottom: 2px solid var(--border-color);
        }
        h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            color: var(--text-primary);
            line-height: 1.2;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            flex-wrap: wrap;
        }
        .update-time {
            color: var(--accent-green);
            font-weight: 600;
        }
        .content-area {
            font-size: 1.1rem;
            max-width: 800px;
            margin: 0 auto;
        }
        h2 {
            font-size: 2rem;
            margin: 50px 0 20px;
            color: var(--text-primary);
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border-color);
        }
        h3 {
            font-size: 1.6rem;
            margin: 40px 0 15px;
            color: var(--primary-purple);
        }
        h4 {
            font-size: 1.3rem;
            margin: 30px 0 12px;
            color: var(--text-secondary);
        }
        p {
            margin-bottom: 1.5em;
            text-align: justify;
        }
        .highlight-box {
            background: linear-gradient(135deg, #f5f7fa, #e4edf5);
            border-left: 5px solid var(--primary-blue);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 10px 10px 0;
        }
        .feature-list {
            list-style: none;
            margin: 25px 0;
        }
        .feature-list li {
            padding: 10px 0 10px 35px;
            position: relative;
        }
        .feature-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--accent-green);
            font-weight: bold;
            font-size: 1.2rem;
        }
        .article-image {
            margin: 40px auto;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow-medium);
            max-width: 900px;
        }
        .article-image figcaption {
            text-align: center;
            font-style: italic;
            color: var(--text-secondary);
            padding: 10px;
            background: var(--card-bg);
            font-size: 0.95rem;
        }
        .user-interaction {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 60px 0;
        }
        .comment-form, .rating-form {
            background: var(--card-bg);
            padding: 30px;
            border-radius: 12px;
            box-shadow: var(--shadow-light);
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 14px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        .form-control:focus {
            border-color: var(--primary-blue);
            outline: none;
            box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.2);
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            gap: 10px;
            margin: 15px 0;
            font-size: 2rem;
            color: #ffc107;
            cursor: pointer;
        }
        .star-rating i {
            transition: transform 0.2s ease;
        }
        .star-rating i:hover {
            transform: scale(1.2);
        }
        .related-links {
            background: var(--card-bg);
            padding: 30px;
            border-radius: 12px;
            margin: 50px 0;
        }
        .link-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }
        .link-item {
            padding: 12px 20px;
            background: white;
            border-radius: 8px;
            border-left: 4px solid var(--primary-blue);
            transition: all 0.3s ease;
        }
        .link-item:hover {
            transform: translateX(5px);
            box-shadow: var(--shadow-light);
        }
        .site-footer {
            background: var(--dark-bg);
            color: #e8eaed;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.2rem;
        }
        friend-link {
            display: block;
            padding: 8px 0;
            color: #bdc1c6;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        friend-link a {
            color: inherit;
        }
        friend-link a:hover {
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #9aa0a6;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .section-spacing {
                padding: 40px 0;
            }
            h2 {
                font-size: 1.7rem;
            }
            h3 {
                font-size: 1.4rem;
            }
            .user-interaction {
                grid-template-columns: 1fr;
            }
            .content-area {
                padding: 0 15px;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fade-in {
            animation: fadeIn 0.8s ease forwards;
        }
        @media print {
            .site-header, .site-footer, .user-interaction {
                display: none;
            }
        }