* { 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, #f8f9fa 0%, #e9ecef 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .site-header {
            background: linear-gradient(90deg, #0a2e6d 0%, #b22222 100%);
            color: white;
            padding: 1rem 2rem;
            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;
            max-width: 1400px;
            margin: 0 auto;
            width: 100%;
        }
        .my-logo {
            font-family: 'Impact', 'Arial Black', sans-serif;
            font-size: 2.2rem;
            font-weight: bold;
            text-decoration: none;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: 1px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }
        .my-logo i { color: #FFD700; }
        .my-logo span { color: #FFD700; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-menu a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-menu a:hover, .nav-menu a:focus {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }
        .breadcrumb {
            background-color: #e9ecef;
            padding: 1rem 2rem;
            font-size: 0.9rem;
            border-bottom: 1px solid #ccc;
        }
        .breadcrumb a {
            color: #0a2e6d;
            text-decoration: none;
        }
        .breadcrumb a:hover { text-decoration: underline; }
        .main-container {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            max-width: 1400px;
            margin: 2rem auto;
            padding: 0 2rem;
            flex: 1;
        }
        .content-area { background: white; padding: 2.5rem; border-radius: 12px; box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08); }
        .sidebar { background: #f8f9fa; padding: 1.5rem; border-radius: 12px; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05); height: fit-content; position: sticky; top: 120px; }
        h1 { color: #0a2e6d; font-size: 2.8rem; margin-bottom: 1.5rem; padding-bottom: 1rem; border-bottom: 3px solid #b22222; }
        h2 { color: #b22222; font-size: 2rem; margin: 2.5rem 0 1rem; }
        h3 { color: #0a2e6d; font-size: 1.5rem; margin: 2rem 0 0.8rem; }
        h4 { color: #555; font-size: 1.2rem; margin: 1.5rem 0 0.5rem; }
        p { margin-bottom: 1.2rem; text-align: justify; }
        .lead { font-size: 1.2rem; color: #555; font-weight: 500; background: #f0f8ff; padding: 1rem; border-left: 4px solid #0a2e6d; border-radius: 0 5px 5px 0; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.4rem; border-radius: 3px; font-weight: 600; }
        .key-term { color: #b22222; font-weight: bold; }
        .stats-box { background: #f0f8ff; border: 2px dashed #0a2e6d; padding: 1.5rem; margin: 1.5rem 0; border-radius: 10px; }
        .stats-box h4 { margin-top: 0; }
        .feature-img {
            width: 100%;
            height: auto;
            border-radius: 10px;
            margin: 2rem 0;
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
            transition: transform 0.5s ease;
        }
        .feature-img:hover { transform: scale(1.01); }
        .img-caption { text-align: center; font-style: italic; color: #666; margin-top: -1.5rem; margin-bottom: 2rem; font-size: 0.95rem; }
        .content-link {
            color: #0a2e6d;
            text-decoration: none;
            border-bottom: 1px dotted #0a2e6d;
            transition: all 0.2s;
        }
        .content-link:hover {
            color: #b22222;
            border-bottom-style: solid;
            background-color: #f9f9f9;
        }
        ul, ol { padding-left: 2rem; margin-bottom: 1.5rem; }
        li { margin-bottom: 0.5rem; }
        .interactive-module {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 1.5rem;
            margin: 2.5rem 0;
            border-left: 5px solid #b22222;
        }
        .module-title { display: flex; align-items: center; gap: 10px; color: #0a2e6d; margin-bottom: 1.2rem; }
        form { display: flex; flex-direction: column; gap: 1rem; }
        input, textarea, select {
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus { outline: none; border-color: #0a2e6d; box-shadow: 0 0 0 3px rgba(10, 46, 109, 0.1); }
        button, .btn {
            background: linear-gradient(to right, #0a2e6d, #b22222);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 6px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        button:hover, .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(0, 0, 0, 0.15);
            background: linear-gradient(to right, #0c3a8a, #d02828);
        }
        .star-rating { display: flex; gap: 5px; margin: 1rem 0; }
        .star-rating label { font-size: 1.8rem; color: #ddd; cursor: pointer; transition: color 0.2s; }
        .star-rating input { display: none; }
        .star-rating input:checked ~ label { color: #FFD700; }
        .star-rating label:hover, .star-rating label:hover ~ label { color: #FFD700; }
        .site-footer {
            background: #1a1a1a;
            color: #ccc;
            padding: 3rem 2rem 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h4 { color: #fff; margin-bottom: 1.2rem; }
        .friend-links { display: flex; flex-wrap: wrap; gap: 1rem; list-style: none; }
        .friend-links a {
            color: #90caf9;
            text-decoration: none;
            padding: 0.3rem 0.6rem;
            background: rgba(255,255,255,0.05);
            border-radius: 4px;
        }
        .friend-links a:hover { background: rgba(255,255,255,0.1); text-decoration: underline; }
        .copyright {
            text-align: center;
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 1024px) {
            .main-container { grid-template-columns: 1fr; }
            .sidebar { position: static; }
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .hamburger { display: block; }
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                margin-top: 1rem;
                gap: 0;
            }
            .nav-menu.active { display: flex; }
            .nav-menu li { width: 100%; }
            .nav-menu a { padding: 1rem; border-bottom: 1px solid rgba(255,255,255,0.1); border-radius: 0; }
            h1 { font-size: 2.2rem; }
            .main-container, .site-header, .breadcrumb { padding-left: 1rem; padding-right: 1rem; }
            .content-area { padding: 1.5rem; }
        }
        .text-center { text-align: center; }
        .mt-3 { margin-top: 3rem; }
        .mb-3 { margin-bottom: 3rem; }
        .last-updated { font-style: italic; color: #666; background: #f9f9f9; padding: 0.5rem; border-radius: 5px; display: inline-block; margin-bottom: 1.5rem; }