* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        a { color: #2c3e50; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #e74c3c; }
        img { max-width: 100%; height: auto; display: block; }
        .site-header {
            background: #2c3e50;
            color: white;
            padding: 1.5rem 0;
            border-radius: 0 0 12px 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            margin-bottom: 2rem;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(90deg, #3498db, #e74c3c);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            padding: 0 1rem;
        }
        .my-logo a { color: inherit; }
        .main-nav { display: flex; align-items: center; }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.8rem;
        }
        .nav-links a {
            color: #ecf0f1;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 6px;
        }
        .nav-links a:hover {
            background: rgba(255,255,255,0.1);
            color: #3498db;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            padding: 1rem 1.5rem;
            background: #ecf0f1;
            border-radius: 8px;
            margin: 1.5rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #3498db; }
        .breadcrumb span { color: #7f8c8d; }
        .search-container {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin: 2rem 0;
            text-align: center;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-input {
            flex-grow: 1;
            padding: 0.9rem 1.2rem;
            border: 2px solid #3498db;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
        }
        .search-btn {
            background: #3498db;
            color: white;
            border: none;
            padding: 0 1.8rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background 0.3s;
        }
        .search-btn:hover { background: #2980b9; }
        .content-area {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 2rem 0;
        }
        @media (max-width: 768px) {
            .content-area { grid-template-columns: 1fr; }
        }
        .main-content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 18px rgba(0,0,0,0.06);
        }
        article h1 {
            font-size: 2.8rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            border-bottom: 3px solid #e74c3c;
            padding-bottom: 0.7rem;
        }
        article h2 {
            font-size: 2rem;
            color: #3498db;
            margin: 2.5rem 0 1rem;
            padding: 0.5rem 0;
            border-left: 5px solid #2c3e50;
            padding-left: 1rem;
        }
        article h3 {
            font-size: 1.6rem;
            color: #2c3e50;
            margin: 2rem 0 1rem;
        }
        article h4 {
            font-size: 1.3rem;
            color: #7f8c8d;
            margin: 1.5rem 0 0.8rem;
        }
        article p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .highlight {
            background: #fffacd;
            padding: 1.5rem;
            border-left: 4px solid #f39c12;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .tip {
            background: #e8f6f3;
            padding: 1.2rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            display: flex;
            align-items: flex-start;
            gap: 1rem;
        }
        .tip i { color: #1abc9c; font-size: 1.5rem; }
        .article-img {
            width: 100%;
            border-radius: 12px;
            margin: 2rem auto;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            border: 3px solid #ecf0f1;
        }
        .sidebar {
            background: white;
            padding: 1.8rem;
            border-radius: 12px;
            box-shadow: 0 6px 18px rgba(0,0,0,0.06);
        }
        .sidebar h3 {
            color: #2c3e50;
            border-bottom: 2px solid #3498db;
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
        }
        .related-links { list-style: none; }
        .related-links li { margin-bottom: 1rem; }
        .related-links a {
            display: block;
            padding: 0.8rem;
            background: #f8f9fa;
            border-radius: 6px;
            border-left: 4px solid #3498db;
        }
        .related-links a:hover {
            background: #e3f2fd;
            border-left-color: #e74c3c;
        }
        .user-interaction {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            margin: 2.5rem 0;
            box-shadow: 0 6px 18px rgba(0,0,0,0.06);
        }
        .interaction-title { color: #2c3e50; margin-bottom: 1.5rem; }
        .form-group { margin-bottom: 1.5rem; }
        label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #555; }
        input, textarea, select {
            width: 100%;
            padding: 0.9rem;
            border: 1px solid #bdc3c7;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
        }
        .rating-container {
            display: flex;
            gap: 0.5rem;
            align-items: center;
            flex-wrap: wrap;
        }
        .star { font-size: 1.8rem; color: #ddd; cursor: pointer; transition: color 0.2s; }
        .star:hover, .star.active { color: #f1c40f; }
        .submit-btn {
            background: #2ecc71;
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        .submit-btn:hover { background: #27ae60; }
        .site-footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            border-radius: 12px 12px 0 0;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            padding: 0 1.5rem;
        }
        .footer-section h3 {
            color: #3498db;
            margin-bottom: 1.5rem;
            font-size: 1.4rem;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.05);
            padding: 0.8rem;
            margin-bottom: 0.8rem;
            border-radius: 6px;
            transition: background 0.3s;
        }
        friend-link:hover {
            background: rgba(255,255,255,0.1);
        }
        friend-link a { color: #ecf0f1; }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #4a6572;
            font-size: 0.9rem;
            color: #bdc3c7;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #34495e;
                position: absolute;
                top: 100%;
                left: 0;
                z-index: 1000;
                padding: 1rem;
                border-radius: 0 0 12px 12px;
            }
            .nav-links.active { display: flex; }
            .header-container { position: relative; }
            .my-logo { font-size: 1.8rem; }
            article h1 { font-size: 2.2rem; }
            article h2 { font-size: 1.8rem; }
        }
        .text-center { text-align: center; }
        .text-bold { font-weight: 800; }
        .emoji { font-size: 1.2em; }
        .last-updated {
            font-style: italic;
            color: #7f8c8d;
            background: #f8f9fa;
            padding: 0.5rem 1rem;
            border-radius: 6px;
            display: inline-block;
            margin: 1rem 0;
        }