* { 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: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { color: #2c3e50; font-weight: 700; margin-bottom: 1rem; }
        h1 { font-size: clamp(2.5rem, 5vw, 3.5rem); line-height: 1.2; }
        h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); border-bottom: 3px solid #3498db; padding-bottom: 0.5rem; }
        h3 { font-size: clamp(1.4rem, 3vw, 1.8rem); color: #2980b9; }
        h4 { font-size: 1.2rem; color: #16a085; }
        p { margin-bottom: 1.5rem; font-size: 1.1rem; }
        .lead { font-size: 1.3rem; color: #555; font-weight: 300; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.5rem; border-radius: 3px; }
        b, strong { color: #e74c3c; }
        a { color: #3498db; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #e74c3c; }
        ul, ol { margin-left: 2rem; margin-bottom: 1.5rem; }
        li { margin-bottom: 0.5rem; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        section { padding: 3rem 0; }
        .site-header {
            background: #2c3e50;
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: #3498db;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover { color: #1abc9c; }
        .my-logo i { font-size: 2.5rem; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #ecf0f1;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
        }
        .main-nav a:hover,
        .main-nav a.active {
            background: #3498db;
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background: #ecf0f1;
            padding: 1rem;
            border-radius: 5px;
            margin: 1rem 0;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            margin: 0;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin: 0 10px;
            color: #7f8c8d;
        }
        .hero {
            background: linear-gradient(rgba(44, 62, 80, 0.9), rgba(44, 62, 80, 0.8)), url('https://images.unsplash.com/photo-1591799264318-7e6ef8ddb7ea?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80') center/cover no-repeat;
            color: white;
            text-align: center;
            padding: 5rem 1rem;
            border-radius: 0 0 20px 20px;
            margin-bottom: 2rem;
        }
        .hero h1 { color: #1abc9c; }
        .hero .lead { color: #bdc3c7; }
        .search-box {
            max-width: 600px;
            margin: 2rem auto;
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        .search-form {
            display: flex;
            gap: 10px;
        }
        .search-input {
            flex: 1;
            padding: 15px;
            border: 2px solid #3498db;
            border-radius: 50px;
            font-size: 1rem;
        }
        .search-btn {
            padding: 15px 30px;
            background: #e74c3c;
            color: white;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            font-weight: bold;
            transition: background 0.3s;
        }
        .search-btn:hover { background: #c0392b; }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .card {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 8px 20px rgba(0,0,0,0.06);
            transition: transform 0.3s, box-shadow 0.3s;
            border-top: 5px solid #3498db;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .card-icon {
            font-size: 2.5rem;
            color: #3498db;
            margin-bottom: 1rem;
        }
        .rating-section, .comment-section {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            margin: 3rem 0;
            box-shadow: 0 8px 20px rgba(0,0,0,0.06);
        }
        .star-rating {
            display: flex;
            gap: 5px;
            margin: 1rem 0;
        }
        .star-rating input { display: none; }
        .star-rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating input:checked ~ label { color: #f1c40f; }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-control {
            width: 100%;
            padding: 15px;
            border: 1px solid #bdc3c7;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            border-color: #3498db;
            outline: none;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        .submit-btn {
            background: #2ecc71;
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 8px;
            font-size: 1.1rem;
            cursor: pointer;
            transition: background 0.3s;
        }
        .submit-btn:hover { background: #27ae60; }
        .article-content {
            background: white;
            padding: 3rem;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            margin-bottom: 3rem;
        }
        .article-img {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: 10px;
            margin: 2rem auto;
            border: 5px solid #ecf0f1;
        }
        .content-block { margin-bottom: 3rem; }
        .update-time {
            font-style: italic;
            color: #7f8c8d;
            text-align: right;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px dashed #bdc3c7;
        }
        .site-footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-links h3 { color: #1abc9c; border-bottom: none; }
        .footer-links ul { list-style: none; margin: 0; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #bdc3c7; }
        .footer-links a:hover { color: #1abc9c; }
        friend-link {
            display: block;
            background: #34495e;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1rem 0;
        }
        friend-link a {
            color: #3498db;
            font-weight: bold;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #34495e;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .main-nav ul { gap: 1rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #2c3e50;
                padding: 1rem;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
            }
            .main-nav.active ul { display: flex; }
            .hero { padding: 3rem 1rem; }
            .article-content { padding: 2rem; }
            .search-form { flex-direction: column; }
        }
        @media (max-width: 480px) {
            .header-inner { flex-direction: column; gap: 1rem; }
            .my-logo { font-size: 1.8rem; }
            h1 { font-size: 2.2rem; }
            .card { padding: 1.5rem; }
        }