* { 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: #222;
            background-color: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-weight: 800; line-height: 1.2; margin-bottom: 1rem; color: #0d3a5c; }
        h1 { font-size: clamp(2.5rem, 5vw, 3.8rem); }
        h2 { font-size: clamp(2rem, 4vw, 2.8rem); border-left: 5px solid #0d3a5c; padding-left: 1rem; margin-top: 3rem; }
        h3 { font-size: clamp(1.5rem, 3vw, 2rem); color: #1565a3; margin-top: 2rem; }
        p { margin-bottom: 1.5rem; font-size: 1.1rem; }
        .lead { font-size: 1.4rem; font-weight: 300; color: #444; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.4rem; border-radius: 3px; }
        .term { font-weight: bold; color: #0d3a5c; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .content-main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            .content-main { grid-template-columns: 1fr; }
        }
        .site-header {
            background: linear-gradient(135deg, #0d3a5c 0%, #1565a3 100%);
            color: white;
            padding: 1.2rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            color: white;
            text-decoration: none;
            font-size: 2rem;
            font-weight: 900;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
        }
        .logo-icon { color: #4CAF50; margin-right: 10px; font-size: 2.2rem; }
        .nav-desktop { display: flex; gap: 2rem; }
        .nav-desktop a {
            color: #e0f7fa;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
            transition: all 0.3s;
        }
        .nav-desktop a:hover, .nav-desktop a.active {
            color: white;
            border-bottom-color: #4CAF50;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: #0d3a5c;
            padding: 1rem;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        .nav-mobile.active { display: flex; }
        .nav-mobile a {
            color: white;
            text-decoration: none;
            padding: 1rem;
            border-bottom: 1px solid #1a4d6e;
        }
        .nav-mobile a:hover { background: #1565a3; }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
            .hamburger { display: block; }
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #e9ecef;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 0.5rem;
            color: #6c757d;
        }
        .breadcrumb a { color: #1565a3; text-decoration: none; }
        .breadcrumb a:hover { text-decoration: underline; }
        .search-widget {
            background: #e3f2fd;
            padding: 2rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
        }
        .search-input {
            flex-grow: 1;
            padding: 0.9rem 1.2rem;
            border: 2px solid #1565a3;
            border-radius: 50px;
            font-size: 1rem;
            transition: box-shadow 0.3s;
        }
        .search-input:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(21, 101, 163, 0.3);
        }
        .search-btn {
            background: #1565a3;
            color: white;
            border: none;
            border-radius: 50px;
            padding: 0 1.8rem;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-btn:hover { background: #0d3a5c; }
        .article-body {
            background: white;
            padding: 2.5rem;
            border-radius: 15px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
        }
        .article-intro { margin-bottom: 3rem; }
        .featured-image {
            width: 100%;
            border-radius: 10px;
            overflow: hidden;
            margin: 2.5rem 0;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 0.8rem;
            background: #f9f9f9;
            font-size: 0.95rem;
        }
        .key-facts {
            background: #f0f8ff;
            border-left: 5px solid #4CAF50;
            padding: 1.5rem;
            margin: 2.5rem 0;
            border-radius: 0 10px 10px 0;
        }
        .key-facts ul { list-style-position: inside; }
        .key-facts li { margin-bottom: 0.7rem; }
        .content-link {
            color: #d32f2f;
            text-decoration: none;
            font-weight: 600;
            border-bottom: 1px dotted #d32f2f;
        }
        .content-link:hover {
            color: #0d3a5c;
            border-bottom-style: solid;
        }
        .section-divider {
            height: 2px;
            background: linear-gradient(to right, transparent, #1565a3, transparent);
            margin: 3.5rem 0;
        }
        .sidebar {
            background: white;
            padding: 1.8rem;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 { font-size: 1.5rem; margin-top: 0; }
        .sidebar-widget { margin-bottom: 2.5rem; }
        .related-links ul { list-style: none; }
        .related-links li { margin-bottom: 1rem; }
        .related-links a {
            display: block;
            padding: 0.8rem 1rem;
            background: #f5f5f5;
            border-radius: 8px;
            color: #222;
            text-decoration: none;
            transition: all 0.3s;
        }
        .related-links a:hover {
            background: #e3f2fd;
            transform: translateX(5px);
            color: #1565a3;
        }
        .icon-list { list-style: none; }
        .icon-list li { margin-bottom: 1rem; display: flex; align-items: center; }
        .icon-list i { color: #4CAF50; margin-right: 10px; font-size: 1.2rem; width: 24px; }
        .user-interaction {
            background: white;
            padding: 2.5rem;
            border-radius: 15px;
            margin-top: 3rem;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
        }
        .interaction-form {
            display: grid;
            gap: 1.5rem;
            max-width: 800px;
        }
        .form-group { display: flex; flex-direction: column; }
        .form-label { margin-bottom: 0.5rem; font-weight: 600; }
        .form-input, .form-textarea {
            padding: 1rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            font-family: inherit;
            transition: border 0.3s;
        }
        .form-input:focus, .form-textarea:focus {
            outline: none;
            border-color: #1565a3;
        }
        .form-textarea { min-height: 150px; resize: vertical; }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            margin-bottom: 1rem;
        }
        .rating-stars .star:hover,
        .rating-stars .star.active { color: #FFD700; }
        .submit-btn {
            background: linear-gradient(to right, #4CAF50, #2E7D32);
            color: white;
            border: none;
            padding: 1.2rem 2.5rem;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 700;
            cursor: pointer;
            transition: transform 0.3s, box-shadow 0.3s;
            justify-self: start;
        }
        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(46, 125, 50, 0.4);
        }
        .site-footer {
            background: #0d3a5c;
            color: #e0f7fa;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-logo { font-size: 2rem; font-weight: 900; margin-bottom: 1rem; }
        .footer-links h4 { color: white; margin-bottom: 1.5rem; }
        .footer-links ul { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a {
            color: #b0e0e6;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-links a:hover { color: white; }
        friend-link {
            display: block;
            background: #1a4d6e;
            padding: 1.5rem;
            border-radius: 10px;
            margin-top: 1.5rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #1a4d6e;
            color: #90a4ae;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .article-body, .sidebar, .user-interaction { padding: 1.5rem; }
            .content-main { gap: 2rem; }
            .search-form { flex-direction: column; }
            .search-btn { padding: 1rem; }
            .rating-stars { font-size: 1.5rem; }
        }