* { 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-color: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-family: Georgia, 'Times New Roman', Times, serif; color: #2c3e50; margin-bottom: 1rem; font-weight: 700; line-height: 1.2; }
        h1 { font-size: clamp(2.5rem, 5vw, 3.8rem); margin-top: 1.5rem; border-bottom: 3px solid #3498db; padding-bottom: 0.5rem; }
        h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-top: 2.5rem; color: #2980b9; }
        h3 { font-size: clamp(1.5rem, 3vw, 1.9rem); margin-top: 2rem; color: #16a085; }
        h4 { font-size: 1.3rem; margin-top: 1.5rem; color: #27ae60; }
        p { margin-bottom: 1.5rem; font-size: 1.1rem; }
        a { color: #3498db; text-decoration: none; transition: color 0.3s ease, background-color 0.3s ease; }
        a:hover { color: #e74c3c; text-decoration: underline; }
        strong, b { color: #2c3e50; font-weight: 700; }
        em { font-style: italic; }
        blockquote { border-left: 4px solid #3498db; padding-left: 1.5rem; margin: 2rem 0; font-style: italic; color: #555; background-color: #ecf0f1; padding: 1.5rem; border-radius: 0 8px 8px 0; }
        ul, ol { margin-bottom: 1.5rem; padding-left: 2rem; }
        li { margin-bottom: 0.5rem; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        @media (min-width: 992px) {
            .main-grid {
                grid-template-columns: 3fr 1fr;
            }
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 50%, #3949ab 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-family: 'Trebuchet MS', sans-serif;
            font-size: 2.2rem;
            font-weight: 900;
            color: #fff;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo span { color: #4fc3f7; }
        .my-logo:hover { color: #fff; text-decoration: none; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .main-nav a {
            color: #e3f2fd;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
        }
        .main-nav a:hover, .main-nav a.active {
            background-color: rgba(255,255,255,0.15);
            color: #fff;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 0.8rem 0;
            margin-bottom: 2rem;
            font-size: 0.95rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding-left: 0;
            margin: 0;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '>';
            margin: 0 10px;
            color: #777;
        }
        .breadcrumb a { color: #3949ab; }
        .article-content {
            background-color: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .lead-in {
            font-size: 1.3rem;
            color: #555;
            background-color: #e1f5fe;
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 2.5rem;
            border-left: 5px solid #0277bd;
        }
        .featured-image {
            margin: 2.5rem auto;
            text-align: center;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            max-width: 800px;
        }
        .featured-image img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .featured-image img:hover { transform: scale(1.02); }
        .image-caption {
            font-style: italic;
            color: #666;
            padding: 0.8rem;
            background-color: #f5f5f5;
            font-size: 0.95rem;
        }
        .info-box {
            background: linear-gradient(to bottom right, #e3f2fd, #f3e5f5);
            border-left: 5px solid #7b1fa2;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .sidebar {
            background-color: white;
            padding: 1.8rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .widget { margin-bottom: 2.5rem; }
        .widget-title {
            font-size: 1.4rem;
            color: #283593;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #c5cae9;
            margin-bottom: 1.2rem;
        }
        .interactive-form { display: flex; flex-direction: column; gap: 1rem; }
        .interactive-form input, .interactive-form textarea, .interactive-form select {
            padding: 0.8rem;
            border: 1px solid #bdc3c7;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
        }
        .interactive-form button {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 1rem;
            border-radius: 6px;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .interactive-form button:hover { background-color: #2980b9; }
        .star-rating { display: flex; gap: 5px; font-size: 1.8rem; color: #f1c40f; margin: 0.5rem 0; }
        .star-rating i { cursor: pointer; transition: color 0.2s; }
        .star-rating i:hover, .star-rating i.active { color: #f39c12; }
        .related-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1rem;
            margin: 2rem 0;
        }
        .related-link {
            background-color: #f1f8e9;
            padding: 1rem;
            border-radius: 8px;
            border: 1px solid #c5e1a5;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .related-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 7px 12px rgba(0,0,0,0.1);
            background-color: #e8f5e9;
        }
        .site-footer {
            background-color: #263238;
            color: #cfd8dc;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-logo { font-size: 2rem; color: white; margin-bottom: 1rem; }
        .footer-links h4 { color: #4fc3f7; margin-bottom: 1.2rem; }
        .footer-links ul { list-style: none; padding-left: 0; }
        .footer-links li { margin-bottom: 0.7rem; }
        .footer-links a { color: #b0bec5; }
        .footer-links a:hover { color: #4fc3f7; }
        friend-link {
            display: block;
            background-color: #37474f;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
        }
        friend-link a {
            color: #80deea;
            font-weight: bold;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #37474f;
            font-size: 0.9rem;
            color: #90a4ae;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                display: none;
                width: 100%;
                order: 3;
                margin-top: 1rem;
            }
            .main-nav.active { display: block; }
            .main-nav ul { flex-direction: column; gap: 0; }
            .main-nav li { width: 100%; }
            .main-nav a { display: block; padding: 1rem; border-bottom: 1px solid rgba(255,255,255,0.1); }
            .header-container { flex-wrap: wrap; }
            .article-content { padding: 1.5rem; }
            .sidebar { position: static; }
            h1 { font-size: 2.2rem; }
        }
        .text-center { text-align: center; }
        .mt-2 { margin-top: 2rem; }
        .mb-2 { margin-bottom: 2rem; }
        .highlight { background-color: #fff9c4; padding: 0.2rem 0.4rem; border-radius: 3px; }
        .update-time { font-size: 0.9rem; color: #7f8c8d; font-style: italic; margin-top: 3rem; padding-top: 1rem; border-top: 1px dashed #bdc3c7; }