* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
            min-height: 100vh;
        }
        img { max-width: 100%; height: auto; display: block; }
        .site-header {
            background: linear-gradient(90deg, #0033a0 0%, #00257a 100%);
            color: white;
            padding: 1rem 2rem;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0, 37, 122, 0.2);
        }
        .header-container {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1.5rem;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            text-transform: uppercase;
            letter-spacing: 1px;
            background: linear-gradient(90deg, #00a3ff, #00ffaa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-decoration: none;
            transition: transform 0.3s ease;
        }
        .my-logo:hover {
            transform: scale(1.05);
        }
        .breadcrumb {
            font-size: 0.9rem;
            color: #b3d4ff;
            margin-top: 0.5rem;
            flex-basis: 100%;
        }
        .breadcrumb a {
            color: #b3d4ff;
            text-decoration: none;
        }
        .breadcrumb a:hover { text-decoration: underline; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 3px solid transparent;
            transition: all 0.3s ease;
        }
        .main-nav a:hover,
        .main-nav a:focus {
            border-bottom-color: #00ffaa;
            color: #00ffaa;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .search-form {
            display: flex;
            max-width: 400px;
            width: 100%;
        }
        .search-input {
            flex: 1;
            padding: 0.8rem 1rem;
            border: none;
            border-radius: 50px 0 0 50px;
            font-size: 1rem;
            outline: none;
        }
        .search-button {
            background: #00a3ff;
            color: white;
            border: none;
            border-radius: 0 50px 50px 0;
            padding: 0 1.5rem;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-button:hover { background: #0088dd; }
        .container {
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        .main-content {
            background: white;
            border-radius: 20px;
            padding: 3rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
        }
        .sidebar {
            background: white;
            border-radius: 20px;
            padding: 2rem;
            height: fit-content;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
        }
        h1 {
            font-size: 2.8rem;
            color: #0033a0;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            color: #00257a;
            margin: 3rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #00a3ff;
        }
        h3 {
            font-size: 1.5rem;
            color: #0055cc;
            margin: 2.5rem 0 1rem;
        }
        h4 {
            font-size: 1.2rem;
            color: #0077ff;
            margin: 2rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .article-summary {
            background: #e8f4ff;
            border-left: 5px solid #00a3ff;
            padding: 1.5rem;
            border-radius: 0 10px 10px 0;
            margin: 2.5rem 0;
        }
        .highlight-box {
            background: linear-gradient(135deg, #f0fff4, #dcffe4);
            border: 2px solid #00cc66;
            border-radius: 15px;
            padding: 2rem;
            margin: 2.5rem 0;
        }
        .step-by-step-guide {
            background: #fff8e1;
            border-radius: 15px;
            padding: 2rem;
            margin: 2.5rem 0;
            counter-reset: step;
        }
        .step {
            margin-bottom: 1.5rem;
            padding-left: 3rem;
            position: relative;
        }
        .step:before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            left: 0;
            top: 0;
            background: #00a3ff;
            color: white;
            width: 2rem;
            height: 2rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
        }
        .internal-links {
            background: #f9f9ff;
            border-radius: 15px;
            padding: 2rem;
            margin: 3rem 0;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
        }
        .internal-links a {
            color: #0055cc;
            text-decoration: none;
            padding: 0.8rem;
            border-radius: 8px;
            background: white;
            border: 1px solid #ddd;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }
        .internal-links a:hover {
            background: #e6f0ff;
            border-color: #00a3ff;
            transform: translateY(-3px);
        }
        .internal-links i {
            color: #00a3ff;
        }
        .featured-image {
            border-radius: 15px;
            overflow: hidden;
            margin: 3rem 0;
            box-shadow: 0 15px 30px rgba(0, 51, 160, 0.2);
        }
        .last-updated {
            font-style: italic;
            color: #666;
            text-align: right;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px solid #eee;
        }
        .user-module {
            background: white;
            border-radius: 15px;
            padding: 2rem;
            margin: 2.5rem 0;
            border: 1px solid #e2e8f0;
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 1.5rem;
            color: #00257a;
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .rating-stars input { display: none; }
        .rating-stars label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s;
        }
        .rating-stars input:checked ~ label,
        .rating-stars label:hover,
        .rating-stars label:hover ~ label {
            color: #ffcc00;
        }
        textarea, input[type="text"], input[type="email"] {
            width: 100%;
            padding: 1rem;
            border: 2px solid #cbd5e1;
            border-radius: 10px;
            font-size: 1rem;
            margin-bottom: 1rem;
            transition: border 0.3s;
        }
        textarea:focus,
        input:focus {
            outline: none;
            border-color: #00a3ff;
        }
        .submit-button {
            background: linear-gradient(90deg, #00a3ff, #0066cc);
            color: white;
            border: none;
            border-radius: 50px;
            padding: 1rem 2.5rem;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .submit-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(0, 102, 204, 0.3);
        }
        .site-footer {
            background: #001f5c;
            color: white;
            padding: 3rem 2rem 2rem;
            margin-top: 4rem;
        }
        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
        }
        .footer-links h4 {
            color: #00ffaa;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links a {
            color: #b3d4ff;
            text-decoration: none;
            display: block;
            padding: 0.5rem 0;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: #00ffaa;
        }
        friend-link {
            display: block;
            background: rgba(0, 163, 255, 0.1);
            border-radius: 10px;
            padding: 1rem;
            margin: 1rem 0;
        }
        friend-link a {
            color: #00ffaa;
            text-decoration: none;
            font-weight: bold;
        }
        .copyright {
            text-align: center;
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 1px solid #003d99;
            color: #8bb9ff;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            .container { grid-template-columns: 1fr; }
            .sidebar { order: -1; }
        }
        @media (max-width: 768px) {
            .header-container { flex-direction: column; align-items: stretch; }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
                display: none;
                margin-top: 1.5rem;
            }
            .main-nav.active ul {
                display: flex;
            }
            .hamburger { display: block; align-self: flex-end; margin-top: -3.5rem; }
            .search-form { margin-top: 1rem; }
            .container { padding: 0 1rem; }
            .main-content { padding: 2rem; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
        }