* {
            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;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: #0056b3;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #003d82;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        h1, h2, h3, h4 {
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 1rem;
            color: #1a365d;
        }
        h1 {
            font-size: 2.8rem;
            margin-top: 1.5rem;
        }
        h2 {
            font-size: 2.2rem;
            margin-top: 2.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
        }
        h3 {
            font-size: 1.8rem;
            margin-top: 2rem;
            color: #2d3748;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }
        strong {
            font-weight: 700;
            color: #2d3748;
        }
        em {
            font-style: italic;
        }
        .site-header {
            background: linear-gradient(135deg, #1a365d 0%, #2c5282 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;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-transform: uppercase;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
        }
        .logo i {
            color: #00b4d8;
            margin-right: 10px;
            font-size: 2.5rem;
        }
        .nav-desktop {
            display: flex;
        }
        .nav-desktop ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-desktop a {
            color: #e2e8f0;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-desktop a:hover {
            color: white;
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: #00b4d8;
            transition: width 0.3s ease;
        }
        .nav-desktop a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 4px;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background-color: white;
            border-radius: 2px;
            transition: 0.3s;
        }
        .nav-mobile {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background-color: #2c5282;
            padding: 1rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        .nav-mobile.active {
            display: block;
        }
        .nav-mobile ul {
            list-style: none;
        }
        .nav-mobile li {
            margin-bottom: 1rem;
        }
        .nav-mobile a {
            color: white;
            font-weight: 600;
            display: block;
            padding: 0.8rem;
            border-radius: 5px;
        }
        .nav-mobile a:hover {
            background-color: #1a365d;
        }
        .breadcrumb {
            background-color: #edf2f7;
            padding: 1rem 0;
            font-size: 0.95rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.5rem;
            color: #718096;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        article {
            background-color: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
        }
        .article-meta {
            color: #718096;
            font-size: 0.95rem;
            margin-bottom: 2rem;
            display: flex;
            gap: 1rem;
        }
        .article-meta i {
            margin-right: 0.5rem;
        }
        .intro-highlight {
            background: linear-gradient(120deg, #e0f7fa 0%, #bbdefb 100%);
            border-left: 5px solid #00b4d8;
            padding: 1.5rem;
            margin-bottom: 2.5rem;
            border-radius: 0 8px 8px 0;
        }
        .intro-highlight p {
            font-size: 1.3rem;
            color: #1a365d;
            margin-bottom: 0;
        }
        .section-img {
            margin: 2.5rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            max-width: 900px;
        }
        .section-img img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .section-img img:hover {
            transform: scale(1.03);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #718096;
            padding: 0.8rem;
            background-color: #f7fafc;
            font-size: 0.95rem;
        }
        .info-box {
            background-color: #f0f9ff;
            border: 1px solid #bae6fd;
            border-radius: 10px;
            padding: 1.5rem;
            margin: 2rem 0;
        }
        .info-box h4 {
            color: #0369a1;
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .info-box h4 i {
            color: #0284c7;
        }
        .tip {
            background-color: #fef3c7;
            border-left: 4px solid #f59e0b;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
        }
        .tip strong {
            color: #92400e;
        }
        .sidebar {
            position: sticky;
            top: 120px;
            align-self: start;
        }
        .sidebar-widget {
            background-color: white;
            padding: 1.8rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin-bottom: 2rem;
        }
        .sidebar-widget h3 {
            font-size: 1.5rem;
            margin-top: 0;
            color: #1e40af;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-widget h3 i {
            color: #3b82f6;
        }
        .search-form {
            display: flex;
            margin-top: 1rem;
        }
        .search-form input {
            flex: 1;
            padding: 0.9rem 1rem;
            border: 2px solid #cbd5e1;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
        }
        .search-form button {
            background-color: #3b82f6;
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .search-form button:hover {
            background-color: #2563eb;
        }
        .quick-links ul {
            list-style: none;
        }
        .quick-links li {
            margin-bottom: 0.8rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .quick-links li::before {
            content: '▶';
            position: absolute;
            left: 0;
            color: #3b82f6;
            font-size: 0.8rem;
        }
        .quick-links a:hover {
            text-decoration: underline;
        }
        .rating-widget {
            text-align: center;
            padding: 1.5rem;
            background: linear-gradient(to bottom right, #fefce8, #fef3c7);
            border-radius: 10px;
            border: 1px dashed #f59e0b;
        }
        .stars {
            font-size: 2rem;
            color: #fbbf24;
            margin: 1rem 0;
            cursor: pointer;
        }
        .stars i {
            margin: 0 2px;
            transition: color 0.2s, transform 0.2s;
        }
        .stars i:hover {
            transform: scale(1.2);
        }
        .rating-form textarea, .comment-form textarea {
            width: 100%;
            padding: 1rem;
            border: 2px solid #cbd5e1;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            margin-bottom: 1rem;
            resize: vertical;
            min-height: 120px;
        }
        .rating-form button, .comment-form button {
            background-color: #10b981;
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            width: 100%;
            transition: background-color 0.3s;
        }
        .rating-form button:hover, .comment-form button:hover {
            background-color: #059669;
        }
        .site-footer {
            background-color: #1a365d;
            color: #cbd5e1;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            margin-bottom: 1rem;
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #cbd5e1;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
            transition: all 0.3s;
        }
        friend-link {
            display: block;
            background-color: #2d3748;
            padding: 1.5rem;
            border-radius: 8px;
            margin-top: 1.5rem;
        }
        friend-link h4 {
            color: #90cdf4;
            margin-top: 0;
        }
        .copyright {
            text-align: center;
            margin-top: 3rem;
            padding-top: 1.5rem;
            border-top: 1px solid #2d3748;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .header-container {
                flex-wrap: wrap;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .content-wrapper, article {
                padding: 1.5rem;
            }
            .footer-container {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }