* { 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%, #f0f4f8 100%);
            min-height: 100vh;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-family: Georgia, 'Times New Roman', Times, serif; color: #1a365d; margin-bottom: 1rem; line-height: 1.3; }
        h1 { font-size: 2.8rem; text-align: center; margin-top: 1.5rem; border-bottom: 3px solid #d4af37; padding-bottom: 1rem; }
        h2 { font-size: 2.2rem; margin-top: 2.5rem; border-left: 5px solid #2d3748; padding-left: 15px; }
        h3 { font-size: 1.8rem; margin-top: 2rem; color: #2d3748; }
        h4 { font-size: 1.4rem; margin-top: 1.5rem; color: #4a5568; }
        p { margin-bottom: 1.2rem; font-size: 1.1rem; text-align: justify; }
        a { color: #2b6cb0; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #1a365d; text-decoration: underline; }
        strong { color: #1a365d; font-weight: 700; }
        em { font-style: italic; color: #4a5568; }
        blockquote {
            border-left: 4px solid #d4af37;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            background-color: #fffbf0;
            font-style: italic;
            border-radius: 0 8px 8px 0;
        }
        ul, ol { margin: 1rem 0 1rem 2rem; }
        li { margin-bottom: 0.5rem; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
        }
        .site-header {
            background: linear-gradient(to right, #1a365d, #2d3748);
            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: #d4af37;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo span { color: white; }
        .my-logo:hover { text-decoration: none; color: #d4af37; }
        .nav-desktop { display: flex; gap: 1.5rem; }
        .nav-desktop a {
            color: #e2e8f0;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-desktop a:hover { color: #d4af37; }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: #d4af37;
            transition: width 0.3s;
        }
        .nav-desktop a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: #2d3748;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: 0 5px 10px rgba(0,0,0,0.2);
        }
        .nav-mobile.active { display: flex; }
        .nav-mobile a {
            color: #e2e8f0;
            padding: 0.8rem;
            border-bottom: 1px solid #4a5568;
        }
        .nav-mobile a:last-child { border-bottom: none; }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
            .hamburger { display: block; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #edf2f7;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #4a5568; }
        .breadcrumb a:hover { color: #1a365d; }
        .breadcrumb span { color: #718096; }
        .sidebar {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: fit-content;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            font-size: 1.3rem;
            border-bottom: 2px solid #d4af37;
            padding-bottom: 0.5rem;
            margin-top: 0;
        }
        .sidebar ul { list-style: none; margin: 1rem 0 0 0; }
        .sidebar li { margin-bottom: 0.8rem; }
        .sidebar a { display: block; padding: 0.5rem; border-radius: 5px; }
        .sidebar a:hover { background-color: #f7fafc; }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.06);
        }
        .intro {
            font-size: 1.2rem;
            color: #4a5568;
            background: #f0fff4;
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 2rem;
            border-left: 5px solid #38a169;
        }
        .featured-img {
            width: 100%;
            border-radius: 10px;
            margin: 2rem 0;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .highlight-box {
            background: linear-gradient(to right, #fffaf0, #feebc8);
            border: 2px dashed #d69e2e;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .update-time {
            text-align: right;
            font-size: 0.9rem;
            color: #718096;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px solid #e2e8f0;
        }
        .interactive-section {
            background: #f7fafc;
            padding: 2rem;
            border-radius: 10px;
            margin: 3rem 0;
            border: 1px solid #e2e8f0;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #2d3748;
        }
        .form-control {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #cbd5e0;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            outline: none;
            border-color: #4299e1;
            box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.2);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            margin: 0.5rem 0;
        }
        .rating i {
            color: #cbd5e0;
            cursor: pointer;
            transition: color 0.2s;
        }
        .rating i:hover,
        .rating i.active { color: #f6ad55; }
        .btn {
            background: linear-gradient(to right, #2b6cb0, #1a365d);
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 6px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s;
            display: inline-block;
        }
        .btn:hover {
            background: linear-gradient(to right, #1a365d, #2b6cb0);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            text-decoration: none;
        }
        .site-footer {
            background: #1a202c;
            color: #a0aec0;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h4 {
            color: #d4af37;
            font-size: 1.2rem;
            margin-bottom: 1.2rem;
            border-bottom: 1px solid #4a5568;
            padding-bottom: 0.5rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
        }
        friend-link a {
            color: #a0aec0;
        }
        friend-link a:hover {
            color: #d4af37;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #2d3748;
            font-size: 0.9rem;
            color: #718096;
        }