* { 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: #2a5db0; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #e63946; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .site-header {
            background: linear-gradient(90deg, #1a2980, #26d0ce);
            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: 2rem;
            font-weight: 800;
            color: white;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
            font-family: 'Arial Black', sans-serif;
        }
        .my-logo span { color: #ffd700; }
        .nav-toggle { display: none; }
        .nav-toggle-label { display: none; cursor: pointer; font-size: 1.8rem; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
        }
        .main-nav a:hover {
            background-color: rgba(255,255,255,0.15);
        }
        .breadcrumb {
            background-color: #e9f2fa;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #c5d7ed;
        }
        .breadcrumb a { color: #555; }
        .breadcrumb a:hover { color: #1a2980; }
        main { flex: 1; padding: 2rem 0; }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        @media (max-width: 992px) {
            .content-wrapper { grid-template-columns: 1fr; }
        }
        article { background: white; border-radius: 12px; padding: 2.5rem; box-shadow: 0 6px 20px rgba(0,0,0,0.08); }
        h1 { color: #1a2980; font-size: 2.8rem; margin-bottom: 1.5rem; line-height: 1.2; border-left: 6px solid #e63946; padding-left: 1rem; }
        h2 { color: #2a5db0; font-size: 2rem; margin: 2.5rem 0 1rem; padding-bottom: 0.5rem; border-bottom: 2px dashed #c5d7ed; }
        h3 { color: #3a7bd5; font-size: 1.6rem; margin: 2rem 0 1rem; }
        h4 { color: #555; font-size: 1.3rem; margin: 1.5rem 0 0.8rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead { font-size: 1.3rem; color: #444; font-weight: 500; background-color: #f0f8ff; padding: 1.2rem; border-radius: 8px; border-left: 4px solid #2a5db0; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.5rem; border-radius: 3px; font-weight: 600; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .article-img {
            width: 100%; border-radius: 10px; margin: 2rem auto; border: 1px solid #ddd; box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        .update-time {
            background: #f8f9fa;
            padding: 1rem;
            border-radius: 8px;
            margin: 2rem 0;
            font-style: italic;
            color: #666;
            border: 1px solid #dee2e6;
        }
        .update-time i { color: #e63946; margin-right: 0.5rem; }
        aside { background: white; border-radius: 12px; padding: 2rem; box-shadow: 0 6px 20px rgba(0,0,0,0.08); align-self: start; }
        .sidebar-widget { margin-bottom: 2.5rem; }
        .sidebar-widget h3 { font-size: 1.4rem; color: #1a2980; margin-bottom: 1.2rem; padding-bottom: 0.5rem; border-bottom: 1px solid #eee; }
        .search-form { display: flex; }
        .search-form input {
            flex: 1;
            padding: 0.9rem;
            border: 2px solid #2a5db0;
            border-radius: 6px 0 0 6px;
            font-size: 1rem;
        }
        .search-form button {
            background: #2a5db0;
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 6px 6px 0;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-form button:hover { background: #1a2980; }
        .link-list { list-style: none; }
        .link-list li { margin-bottom: 0.8rem; padding-bottom: 0.8rem; border-bottom: 1px dotted #ddd; }
        .link-list a { display: flex; align-items: center; }
        .link-list i { margin-right: 0.7rem; color: #3a7bd5; }
        .interaction-form {
            background: #f8f9fa;
            padding: 1.8rem;
            border-radius: 10px;
            margin: 2.5rem 0;
            border: 1px solid #dee2e6;
        }
        .interaction-form h3 { margin-top: 0; }
        .form-group { margin-bottom: 1.2rem; }
        .form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #444; }
        .form-control {
            width: 100%;
            padding: 0.9rem;
            border: 1px solid #b0bec5;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus { outline: none; border-color: #2a5db0; box-shadow: 0 0 0 3px rgba(42, 93, 176, 0.1); }
        .btn-submit {
            background: linear-gradient(to right, #1a2980, #26d0ce);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 6px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .btn-submit:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(26, 41, 128, 0.2);
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #ffd700;
            cursor: pointer;
            margin-bottom: 1rem;
        }
        .star-rating i:hover { transform: scale(1.2); }
        .site-footer {
            background: linear-gradient(90deg, #1a2980, #26d0ce);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section { flex: 1; min-width: 250px; }
        .footer-section h4 {
            color: #ffd700;
            margin-bottom: 1.5rem;
            font-size: 1.4rem;
        }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #d1e8ff; }
        .footer-links a:hover { color: white; text-decoration: underline; }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 0.5rem 1rem;
            border-radius: 4px;
            margin: 0.3rem;
            font-size: 0.9rem;
        }
        .copyright {
            text-align: center;
            margin-top: 3rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.2);
            font-size: 0.9rem;
            color: #d1e8ff;
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .nav-toggle-label { display: block; }
            .main-nav {
                width: 100%;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease-in-out;
            }
            .nav-toggle:checked ~ .main-nav { max-height: 400px; margin-top: 1rem; }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav li { width: 100%; border-top: 1px solid rgba(255,255,255,0.1); }
            .main-nav a { display: block; padding: 1rem; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            article, aside { padding: 1.5rem; }
            .content-wrapper { gap: 1.5rem; }
        }