* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        a {
            color: #2a6ebb;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #1d4f8a;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
        }
        @media (min-width: 992px) {
            .main-grid {
                grid-template-columns: 3fr 1fr;
            }
        }
        .site-header {
            background: linear-gradient(135deg, #1a365d 0%, #2d5a9a 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;
            background: linear-gradient(to right, #4facfe, #00f2fe);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }
        .nav-desktop {
            display: none;
        }
        @media (min-width: 768px) {
            .nav-desktop {
                display: block;
            }
            .nav-desktop ul {
                display: flex;
                list-style: none;
                gap: 1.5rem;
            }
            .nav-desktop a {
                color: #e2e8f0;
                font-weight: 500;
                padding: 0.5rem 0;
                border-bottom: 2px solid transparent;
            }
            .nav-desktop a:hover {
                color: white;
                border-bottom-color: #00f2fe;
                text-decoration: none;
            }
        }
        .hamburger {
            display: block;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        @media (min-width: 768px) {
            .hamburger {
                display: none;
            }
        }
        .nav-mobile {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background: #1a365d;
            padding: 1rem;
            transform: translateY(-100%);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            z-index: 999;
        }
        .nav-mobile.active {
            transform: translateY(0);
            opacity: 1;
            visibility: visible;
        }
        .nav-mobile ul {
            list-style: none;
        }
        .nav-mobile li {
            margin-bottom: 1rem;
        }
        .nav-mobile a {
            color: #e2e8f0;
            font-size: 1.1rem;
            display: block;
            padding: 0.5rem;
            border-radius: 4px;
        }
        .nav-mobile a:hover {
            background: rgba(255,255,255,0.1);
            color: white;
            text-decoration: none;
        }
        .breadcrumb {
            background-color: #edf2f7;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 10px;
            color: #718096;
        }
        .breadcrumb a {
            color: #4a5568;
        }
        .main-content {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin-bottom: 2rem;
        }
        article {
            max-width: 900px;
            margin: 0 auto;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a365d;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #00f2fe;
            padding-bottom: 0.5rem;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
        }
        h2 {
            font-size: 2rem;
            color: #2d5a9a;
            margin: 2.5rem 0 1.2rem;
            padding-top: 1rem;
        }
        h3 {
            font-size: 1.6rem;
            color: #4a5568;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #718096;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            hyphens: auto;
        }
        .lead {
            font-size: 1.2rem;
            color: #4a5568;
            font-weight: 500;
            margin-bottom: 2rem;
            padding-left: 1rem;
            border-left: 4px solid #4facfe;
        }
        .highlight {
            background-color: #fef3c7;
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 5px solid #f59e0b;
            margin: 2rem 0;
        }
        b, strong {
            color: #1a365d;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            color: #718096;
            font-size: 0.9rem;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .article-img {
            margin: 2.5rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
            max-width: 800px;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #718096;
            font-size: 0.9rem;
            padding: 0.8rem;
            background: #f8f9fa;
            border-top: 1px solid #e2e8f0;
        }
        .interactive-module {
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            padding: 1.8rem;
            margin: 3rem 0;
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #2d5a9a;
            margin-bottom: 1.5rem;
        }
        .module-title i {
            color: #4facfe;
        }
        form {
            display: grid;
            gap: 1.2rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        label {
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #4a5568;
        }
        input, textarea, select {
            padding: 0.9rem;
            border: 1px solid #cbd5e0;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: border-color 0.2s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #4facfe;
            box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.2);
        }
        button, .btn {
            background: linear-gradient(to right, #4facfe, #00f2fe);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 6px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            justify-self: start;
        }
        button:hover, .btn:hover {
            background: linear-gradient(to right, #3a9cf5, #00d9e6);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(79, 172, 254, 0.3);
            text-decoration: none;
        }
        .star-rating {
            display: flex;
            gap: 5px;
            font-size: 1.8rem;
            color: #cbd5e0;
            cursor: pointer;
            margin: 0.5rem 0;
        }
        .star-rating .star:hover,
        .star-rating .star.active {
            color: #fbbf24;
        }
        .sidebar {
            background: white;
            border-radius: 12px;
            padding: 1.8rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            align-self: start;
            position: sticky;
            top: 100px;
        }
        .sidebar h3 {
            font-size: 1.4rem;
            margin-top: 0;
            padding-bottom: 0.8rem;
            border-bottom: 2px solid #e2e8f0;
        }
        .related-links {
            list-style: none;
        }
        .related-links li {
            margin-bottom: 1rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #edf2f7;
        }
        .related-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #4a5568;
        }
        .related-links a:hover {
            color: #2a6ebb;
        }
        .related-links i {
            color: #4facfe;
        }
        .site-footer {
            background: #1a365d;
            color: #cbd5e0;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1.2rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
        }
        friend-link a {
            color: #a0aec0;
        }
        friend-link a:hover {
            color: #00f2fe;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2d5a9a;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        .last-updated {
            background: #e6fffa;
            padding: 1rem;
            border-radius: 6px;
            margin: 1.5rem 0;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 0.9rem;
        }
        .tag {
            display: inline-block;
            background: #edf2f7;
            color: #4a5568;
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.85rem;
            margin: 0.3rem;
        }
        .visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }