* {
            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%, #e4e8f0 100%);
            min-height: 100vh;
        }
        h1, h2, h3, h4 {
            font-family: 'Arial Black', Gadget, sans-serif;
            color: #1a237e;
            margin-bottom: 1.2rem;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            background: linear-gradient(90deg, #1a237e, #283593);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            padding-bottom: 0.5rem;
            border-bottom: 4px solid #ff9800;
        }
        h2 {
            font-size: 2.2rem;
            color: #283593;
            padding-left: 1rem;
            border-left: 5px solid #ff9800;
        }
        h3 {
            font-size: 1.8rem;
            color: #3949ab;
        }
        h4 {
            font-size: 1.4rem;
            color: #5c6bc0;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            hyphens: auto;
        }
        strong {
            color: #1a237e;
            font-weight: 700;
        }
        em {
            color: #d32f2f;
            font-style: italic;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: white;
            padding: 1.5rem 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: 2.2rem;
            font-weight: 900;
            text-decoration: none;
            color: #ff9800;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
            transition: transform 0.3s ease;
        }
        .my-logo:hover {
            transform: scale(1.05);
        }
        .my-logo span {
            color: white;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .main-nav a:hover,
        .main-nav a.active {
            background-color: #ff9800;
            color: #1a237e;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background: #e8eaf6;
            padding: 1rem 0;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 0.5rem;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 0.5rem;
            color: #5c6bc0;
        }
        .breadcrumb a {
            color: #3949ab;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            background: white;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            padding: 3rem;
            margin: 2rem auto;
            position: relative;
            overflow: hidden;
        }
        main::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, #1a237e, #ff9800, #1a237e);
        }
        .article-section {
            margin-bottom: 3.5rem;
            padding-bottom: 2rem;
            border-bottom: 2px dashed #e0e0e0;
        }
        .highlight-box {
            background: linear-gradient(135deg, #e8eaf6, #f3e5f5);
            border-left: 6px solid #ff9800;
            padding: 2rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
        }
        .interactive-features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .feature-box {
            background: #f5f5f5;
            padding: 2rem;
            border-radius: 10px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .feature-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .feature-box h3 {
            color: #1a237e;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feature-box form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .feature-box input,
        .feature-box textarea,
        .feature-box select {
            padding: 0.8rem;
            border: 2px solid #c5cae9;
            border-radius: 6px;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }
        .feature-box input:focus,
        .feature-box textarea:focus,
        .feature-box select:focus {
            outline: none;
            border-color: #3949ab;
        }
        .feature-box button {
            background: linear-gradient(135deg, #1a237e, #3949ab);
            color: white;
            border: none;
            padding: 1rem 1.5rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .feature-box button:hover {
            background: linear-gradient(135deg, #283593, #5c6bc0);
            transform: translateY(-2px);
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            justify-content: center;
            margin: 1rem 0;
        }
        .rating-stars i {
            color: #ffc107;
            font-size: 1.8rem;
            cursor: pointer;
            transition: transform 0.2s ease;
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }
        .related-links {
            background: #f9f9f9;
            padding: 2rem;
            border-radius: 10px;
            margin: 2.5rem 0;
        }
        .related-links h3 {
            color: #1a237e;
            margin-bottom: 1.5rem;
        }
        .related-links ul {
            columns: 2;
            list-style: none;
        }
        .related-links li {
            margin-bottom: 1rem;
            break-inside: avoid;
        }
        .related-links a {
            color: #3949ab;
            text-decoration: none;
            padding: 0.5rem 0;
            display: block;
            transition: all 0.3s ease;
            border-bottom: 1px dashed transparent;
        }
        .related-links a:hover {
            color: #ff9800;
            border-bottom-color: #ff9800;
            padding-left: 0.8rem;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 12px;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            transition: transform 0.5s ease;
        }
        .article-image:hover {
            transform: scale(1.02);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        footer {
            background: linear-gradient(135deg, #1a237e 0%, #0d1440 100%);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: #ff9800;
            border-bottom: 2px solid #3949ab;
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #c5cae9;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer-links a:hover {
            color: #ff9800;
            padding-left: 0.5rem;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.1);
            padding: 1rem;
            border-radius: 6px;
            margin: 1rem 0;
            transition: all 0.3s ease;
        }
        friend-link:hover {
            background: rgba(255, 255, 255, 0.2);
            transform: translateX(5px);
        }
        friend-link a {
            color: #ff9800;
            text-decoration: none;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #3949ab;
            color: #c5cae9;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 2rem; }
            .container { padding: 0 15px; }
            main { padding: 2rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                background: #1a237e;
                transition: left 0.3s ease;
                padding: 2rem;
                box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            }
            .main-nav.active {
                left: 0;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 1rem;
            }
            .related-links ul {
                columns: 1;
            }
            .interactive-features {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 576px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.7rem; }
            main { padding: 1.5rem; }
            .feature-box { padding: 1.5rem; }
            .highlight-box { padding: 1.5rem; }
        }
        @media print {
            .interactive-features,
            .hamburger,
            .main-nav,
            footer {
                display: none;
            }
            body {
                background: white;
                color: black;
            }
            main {
                box-shadow: none;
                padding: 0;
            }
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        a:focus,
        button:focus,
        input:focus,
        textarea:focus,
        select:focus {
            outline: 3px solid #ff9800;
            outline-offset: 2px;
        }