* { 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%, #e4e8f0 100%);
            background-attachment: fixed;
        }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(90deg, #2c3e50, #4a6491);
            color: white;
            padding: 1.5rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            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: 900;
            text-transform: uppercase;
            letter-spacing: 2px;
            background: linear-gradient(90deg, #f1c40f, #e74c3c);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none;
            transition: transform 0.3s;
        }
        .my-logo:hover {
            transform: scale(1.05);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #ecf0f1;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .main-nav a:hover,
        .main-nav a.active {
            background-color: #e74c3c;
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        #nav-toggle { display: none; }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: #7f8c8d;
        }
        .breadcrumb a {
            color: #3498db;
            text-decoration: none;
        }
        .breadcrumb a:hover { text-decoration: underline; }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 2rem 0;
        }
        @media (max-width: 768px) {
            .main-content { grid-template-columns: 1fr; }
        }
        .article-main {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
        }
        .article-main h1 {
            font-size: 2.8rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 4px solid #f1c40f;
            padding-bottom: 0.5rem;
        }
        .article-main h2 {
            font-size: 2rem;
            color: #2980b9;
            margin: 2.5rem 0 1rem;
            padding-left: 10px;
            border-left: 5px solid #e74c3c;
        }
        .article-main h3 {
            font-size: 1.6rem;
            color: #16a085;
            margin: 2rem 0 1rem;
        }
        .article-main h4 {
            font-size: 1.3rem;
            color: #8e44ad;
            margin: 1.5rem 0 0.8rem;
        }
        .article-main p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .article-main strong {
            color: #c0392b;
            font-weight: 700;
        }
        .article-main em {
            background-color: #fffacd;
            font-style: italic;
            padding: 0 2px;
        }
        .article-main a {
            color: #3498db;
            text-decoration: none;
            border-bottom: 1px dashed #3498db;
            transition: color 0.3s;
        }
        .article-main a:hover {
            color: #e74c3c;
            border-bottom-style: solid;
        }
        .featured-img {
            float: right;
            margin: 0 0 1.5rem 2rem;
            border-radius: 8px;
            border: 3px solid #f1c40f;
            max-width: 400px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .update-time {
            display: inline-block;
            background: #2ecc71;
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .sidebar-widget {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.06);
        }
        .sidebar-widget h3 {
            color: #2c3e50;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #3498db;
        }
        .search-form input,
        .comment-form input,
        .comment-form textarea,
        .rating-form select {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid #bdc3c7;
            border-radius: 6px;
            font-family: inherit;
        }
        .search-form button,
        .comment-form button,
        .rating-form button {
            background: #3498db;
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 6px;
            cursor: pointer;
            font-weight: bold;
            transition: background 0.3s;
            width: 100%;
        }
        .search-form button:hover,
        .comment-form button:hover,
        .rating-form button:hover {
            background: #2980b9;
        }
        .stars {
            display: flex;
            justify-content: space-around;
            font-size: 1.8rem;
            color: #f1c40f;
            margin: 1rem 0;
        }
        .site-footer {
            background: #2c3e50;
            color: #ecf0f1;
            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-links a {
            color: #bdc3c7;
            text-decoration: none;
            display: block;
            margin-bottom: 0.5rem;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: #f1c40f;
        }
        .friend-links {
            background: #34495e;
            padding: 1rem;
            border-radius: 6px;
            margin: 1.5rem 0;
        }
        .friend-links a {
            color: #1abc9c;
            font-weight: bold;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #4a627a;
            font-size: 0.9rem;
            color: #95a5a6;
        }
        @media (max-width: 992px) {
            .header-content { flex-direction: column; gap: 1rem; }
            .main-nav ul { gap: 1rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease;
                width: 100%;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
                padding-top: 1rem;
            }
            .main-nav li { text-align: center; }
            .main-nav a {
                display: block;
                padding: 1rem;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            #nav-toggle:checked ~ .main-nav {
                max-height: 500px;
            }
            .article-main h1 { font-size: 2.2rem; }
            .featured-img {
                float: none;
                margin: 1rem auto;
                max-width: 100%;
            }
        }