:root {
            --primary: #2c3e50;
            --secondary: #3498db;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #1a2530;
            --text: #333;
            --gray: #7f8c8d;
            --success: #27ae60;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --radius: 8px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text);
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: var(--primary);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: color 0.3s;
        }
        .my-logo:hover {
            color: var(--secondary);
        }
        .my-logo span {
            color: var(--secondary);
            font-weight: 900;
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: var(--radius);
            transition: all 0.3s;
        }
        .nav-desktop a:hover, .nav-desktop a.active {
            background: var(--secondary);
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: var(--dark);
            padding: 1rem;
            margin-top: 1rem;
            border-radius: var(--radius);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav a {
            color: white;
            text-decoration: none;
            padding: 12px 16px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .mobile-nav a:last-child {
            border-bottom: none;
        }
        .breadcrumb {
            background: var(--light);
            padding: 12px 0;
            margin-bottom: 2rem;
            border-radius: var(--radius);
        }
        .breadcrumb a {
            color: var(--secondary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            color: var(--gray);
            margin: 0 8px;
        }
        main {
            background: white;
            border-radius: var(--radius);
            padding: 2.5rem;
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        article {
            max-width: 900px;
            margin: 0 auto;
        }
        h1 {
            color: var(--primary);
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid var(--secondary);
            padding-bottom: 15px;
        }
        h2 {
            color: var(--primary);
            font-size: 2rem;
            margin: 2.5rem 0 1rem;
            padding-left: 10px;
            border-left: 4px solid var(--accent);
        }
        h3 {
            color: var(--dark);
            font-size: 1.5rem;
            margin: 1.8rem 0 0.8rem;
        }
        h4 {
            color: var(--secondary);
            font-size: 1.2rem;
            margin: 1.5rem 0 0.5rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--dark);
            background: var(--light);
            padding: 1.5rem;
            border-radius: var(--radius);
            margin-bottom: 2rem;
            border-left: 5px solid var(--secondary);
        }
        .highlight {
            background: linear-gradient(120deg, #a1c4fd 0%, #c2e9fb 100%);
            padding: 2rem;
            border-radius: var(--radius);
            margin: 2rem 0;
            border: 2px solid var(--secondary);
        }
        .highlight h3 {
            color: var(--primary);
            margin-top: 0;
        }
        .content-img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
            margin: 2rem auto;
            display: block;
            box-shadow: var(--shadow);
            border: 1px solid #ddd;
        }
        .float-right {
            float: right;
            margin: 1rem 0 1rem 2rem;
            max-width: 45%;
        }
        .clearfix::after {
            content: "";
            clear: both;
            display: table;
        }
        emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        strong {
            color: var(--primary);
            font-weight: 700;
        }
        a.article-link {
            color: var(--secondary);
            text-decoration: none;
            border-bottom: 1px dashed var(--secondary);
            transition: all 0.2s;
        }
        a.article-link:hover {
            color: var(--accent);
            border-bottom: 1px solid var(--accent);
        }
        blockquote {
            border-left: 4px solid var(--accent);
            padding-left: 1.5rem;
            margin: 2rem 0;
            font-style: italic;
            color: var(--dark);
            background: #f9f9f9;
            padding: 1.5rem;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        ul, ol {
            margin: 1rem 0 1rem 2rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .feature-card {
            background: var(--light);
            padding: 1.5rem;
            border-radius: var(--radius);
            border-top: 4px solid var(--secondary);
            transition: transform 0.3s;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        .feature-card i {
            font-size: 2rem;
            color: var(--secondary);
            margin-bottom: 1rem;
        }
        .feature-card h4 {
            margin-top: 0;
        }
        .interactive-section {
            background: #f8f9fa;
            border-radius: var(--radius);
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid #dee2e6;
        }
        .search-box {
            display: flex;
            max-width: 600px;
            margin: 0 auto 2rem;
        }
        .search-box input {
            flex: 1;
            padding: 15px;
            border: 2px solid var(--secondary);
            border-radius: var(--radius) 0 0 var(--radius);
            font-size: 1rem;
        }
        .search-box button {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 var(--radius) var(--radius) 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background 0.3s;
        }
        .search-box button:hover {
            background: var(--primary);
        }
        .rating-section {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin: 2rem 0;
            flex-wrap: wrap;
        }
        .stars {
            display: flex;
            gap: 5px;
        }
        .stars i {
            color: #f1c40f;
            font-size: 1.5rem;
            cursor: pointer;
            transition: transform 0.2s;
        }
        .stars i:hover {
            transform: scale(1.2);
        }
        .comment-form {
            background: white;
            padding: 2rem;
            border-radius: var(--radius);
            margin-top: 2rem;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--primary);
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: var(--radius);
            font-size: 1rem;
            font-family: inherit;
        }
        .form-group textarea {
            min-height: 150px;
            resize: vertical;
        }
        .btn {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: var(--radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        .btn:hover {
            background: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }
        .btn-accent {
            background: var(--accent);
        }
        .btn-accent:hover {
            background: #c0392b;
        }
        .update-time {
            color: var(--gray);
            font-size: 0.9rem;
            text-align: right;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px solid #eee;
        }
        footer {
            background: var(--primary);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: var(--secondary);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.1);
            padding: 1.5rem;
            border-radius: var(--radius);
            margin: 1.5rem 0;
            border-left: 4px solid var(--secondary);
        }
        friend-link a {
            color: var(--secondary);
            font-weight: 600;
            text-decoration: none;
            font-size: 1.1rem;
        }
        friend-link a:hover {
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #bdc3c7;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            main {
                padding: 1.5rem;
            }
            .float-right {
                float: none;
                margin: 1.5rem auto;
                max-width: 100%;
            }
        }
        @media (max-width: 576px) {
            .header-content {
                flex-direction: column;
                gap: 1rem;
            }
            .my-logo {
                font-size: 1.8rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }