* { 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;
            display: flex;
            flex-direction: column;
        }
        a { color: #2c5282; text-decoration: none; transition: all 0.3s ease; }
        a:hover { color: #1a365d; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .section-padding { padding: 60px 0; }
        .site-header {
            background: linear-gradient(90deg, #1e3c72 0%, #2a5298 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;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #FFD700;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }
        .my-logo:hover { text-decoration: none; color: #FFED4E; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
        }
        .main-nav a:hover,
        .main-nav a.active {
            text-decoration: none;
            border-bottom-color: #FFD700;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background: #edf2f7;
            padding: 1rem;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a { color: #4a5568; }
        .breadcrumb span { color: #718096; }
        main { flex: 1; }
        .article-content {
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            padding: 3rem;
            margin-bottom: 3rem;
        }
        h1 {
            color: #1a365d;
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #FFD700;
            padding-bottom: 0.5rem;
        }
        h2 {
            color: #2c5282;
            font-size: 2rem;
            margin: 2.5rem 0 1rem;
            padding-top: 1rem;
        }
        h3 {
            color: #4a5568;
            font-size: 1.5rem;
            margin: 2rem 0 1rem;
        }
        h4 {
            color: #718096;
            font-size: 1.2rem;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            color: #2d3748;
            font-weight: 500;
            background: #f7fafc;
            padding: 1.5rem;
            border-left: 5px solid #4299e1;
            border-radius: 0 8px 8px 0;
            margin-bottom: 2.5rem;
        }
        .highlight {
            background: linear-gradient(120deg, #fffbeb 0%, #fed7d7 100%);
            padding: 2rem;
            border-radius: 10px;
            border: 2px dashed #e53e3e;
            margin: 2rem 0;
        }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .internal-link {
            background: #ebf8ff;
            padding: 2px 6px;
            border-radius: 4px;
            font-weight: 600;
        }
        .internal-link:hover { background: #bee3f8; text-decoration: none; }
        .figure-container {
            margin: 2.5rem auto;
            text-align: center;
            max-width: 800px;
        }
        .figure-container img {
            border-radius: 10px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            border: 1px solid #e2e8f0;
        }
        .figure-caption {
            font-style: italic;
            color: #718096;
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        .last-updated {
            text-align: right;
            font-size: 0.9rem;
            color: #a0aec0;
            margin-top: 4rem;
            padding-top: 1rem;
            border-top: 1px solid #e2e8f0;
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .search-box, .comment-box, .rating-box {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 1.5rem;
            border: 1px solid #e9ecef;
        }
        .search-box h3, .comment-box h3, .rating-box h3 {
            margin-top: 0;
            color: #2c5282;
        }
        form { display: flex; flex-direction: column; gap: 1rem; }
        input, textarea, select {
            padding: 0.8rem;
            border: 1px solid #cbd5e0;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
        }
        button {
            background: linear-gradient(90deg, #2b6cb0 0%, #2c5282 100%);
            color: white;
            border: none;
            padding: 0.9rem 1.5rem;
            border-radius: 6px;
            font-weight: 700;
            cursor: pointer;
            transition: background 0.3s;
        }
        button:hover { background: linear-gradient(90deg, #2c5282 0%, #1a365d 100%); }
        .stars { display: flex; gap: 5px; font-size: 1.8rem; color: #e2e8f0; }
        .stars .star { cursor: pointer; }
        .stars .star.active { color: #FFD700; }
        .site-footer {
            background: #1a202c;
            color: #cbd5e0;
            padding: 3rem 0 1.5rem;
            margin-top: auto;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-links h4 { color: #fff; margin-bottom: 1rem; }
        .footer-links ul { list-style: none; }
        .footer-links li { margin-bottom: 0.5rem; }
        .footer-links a { color: #a0aec0; }
        .footer-links a:hover { color: #fff; }
        friend-link {
            display: block;
            background: #2d3748;
            padding: 1rem;
            border-radius: 6px;
            margin: 0.5rem 0;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #4a5568;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #2a5298;
                padding: 1rem;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
            }
            .main-nav.active ul { display: flex; }
            .main-nav ul li { text-align: center; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            .article-content { padding: 1.5rem; }
            .header-container { flex-wrap: wrap; }
        }