* { 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: #f0f8ff;
            background-image: linear-gradient(to bottom, #f0f8ff, #e6f2ff);
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #001f3f 0%, #003366 100%);
            color: #fff;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0, 31, 63, 0.2);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 800;
        }
        .logo a {
            color: #4dabf7;
            text-decoration: none;
            text-transform: uppercase;
            letter-spacing: 1px;
            transition: color 0.3s;
        }
        .logo a:hover { color: #74c0fc; }
        .desktop-nav { display: flex; gap: 1.5rem; }
        .desktop-nav a {
            color: #e7f5ff;
            text-decoration: none;
            padding: 0.6rem 1.2rem;
            border-radius: 30px;
            font-weight: 600;
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }
        .desktop-nav a:hover, .desktop-nav a:focus {
            background-color: #1c7ed6;
            border-color: #a5d8ff;
            transform: translateY(-2px);
        }
        .hamburger-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background-color: #002952;
            padding: 1rem;
            margin-top: 1rem;
            border-radius: 10px;
            animation: slideDown 0.3s ease;
        }
        @keyframes slideDown {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .mobile-nav.active { display: flex; }
        .mobile-nav a {
            color: #e7f5ff;
            text-decoration: none;
            padding: 1rem;
            border-bottom: 1px solid #1c7ed6;
            font-weight: 600;
        }
        .mobile-nav a:last-child { border-bottom: none; }
        .mobile-nav a:hover { background-color: #1c7ed6; border-radius: 5px; }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #e7f5ff;
            border-bottom: 1px solid #a5d8ff;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: #1c7ed6;
            text-decoration: none;
            font-weight: 500;
        }
        .breadcrumb a:hover { text-decoration: underline; }
        main { padding: 2.5rem 0; background-color: #fff; }
        .article-content {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 20px;
        }
        h1 {
            font-size: 2.8rem;
            color: #001f3f;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            text-align: center;
            padding-bottom: 1rem;
            border-bottom: 3px solid #ffd43b;
        }
        h2 {
            font-size: 2.2rem;
            color: #1864ab;
            margin-top: 3rem;
            margin-bottom: 1.5rem;
            padding-left: 10px;
            border-left: 5px solid #1c7ed6;
        }
        h3 {
            font-size: 1.6rem;
            color: #339af0;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .intro-highlight {
            background: linear-gradient(90deg, #fff3bf, #ffec99);
            padding: 1.8rem;
            border-radius: 12px;
            border-left: 6px solid #f59f00;
            margin: 2rem 0;
            font-weight: 600;
            color: #5c3c00;
            box-shadow: 0 4px 10px rgba(245, 159, 0, 0.15);
        }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .keyword { color: #d6336c; font-weight: 700; }
        .important-note {
            background-color: #e7f5ff;
            padding: 1.5rem;
            border-radius: 10px;
            border: 2px dashed #1c7ed6;
            margin: 2rem 0;
        }
        .data-point {
            display: inline-grid;
            grid-template-columns: auto auto;
            gap: 1rem;
            background-color: #f8f9fa;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 1.5rem 0;
            border: 1px solid #dee2e6;
        }
        .data-point div { padding: 0.5rem; }
        .data-point span:first-child { font-weight: bold; color: #1864ab; }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 2.5rem auto;
            border-radius: 12px;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
            border: 3px solid #a5d8ff;
        }
        .internal-link {
            color: #1c7ed6;
            text-decoration: none;
            font-weight: 600;
            border-bottom: 2px dotted #74c0fc;
            padding-bottom: 2px;
            transition: all 0.2s;
        }
        .internal-link:hover {
            color: #d6336c;
            border-bottom-style: solid;
            background-color: #fff0f6;
        }
        .links-context {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            background-color: #f1f3f5;
            padding: 2rem;
            border-radius: 12px;
            margin: 3rem 0;
        }
        .links-context a {
            background: white;
            padding: 1rem;
            border-radius: 8px;
            text-decoration: none;
            color: #1864ab;
            font-weight: 500;
            border: 1px solid #ced4da;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .links-context a::before { content: '🔗'; }
        .links-context a:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
            border-color: #1c7ed6;
        }
        .interactive-module {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            padding: 2.5rem;
            border-radius: 15px;
            margin: 3rem 0;
            border: 1px solid #adb5bd;
            box-shadow: inset 0 2px 5px rgba(0,0,0,0.05);
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #495057;
            margin-bottom: 1.5rem;
        }
        .module-title i { color: #1c7ed6; }
        .form-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 1.5rem;
        }
        @media (min-width: 768px) {
            .form-grid { grid-template-columns: repeat(2, 1fr); }
        }
        .form-group { display: flex; flex-direction: column; }
        .form-group label {
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #343a40;
        }
        .form-control {
            padding: 0.9rem;
            border: 2px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }
        .form-control:focus {
            outline: none;
            border-color: #1c7ed6;
            box-shadow: 0 0 0 3px rgba(28, 126, 214, 0.2);
        }
        .btn-submit {
            padding: 1rem 2rem;
            background: linear-gradient(135deg, #1c7ed6 0%, #1864ab 100%);
            color: white;
            border: none;
            border-radius: 30px;
            font-size: 1.1rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
            justify-self: start;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .btn-submit:hover {
            background: linear-gradient(135deg, #1864ab 0%, #0c3a6d 100%);
            transform: scale(1.03);
            box-shadow: 0 6px 12px rgba(28, 126, 214, 0.3);
        }
        .star-rating {
            display: flex;
            gap: 10px;
            margin-bottom: 1rem;
        }
        .star-rating input { display: none; }
        .star-rating label {
            font-size: 2rem;
            color: #dee2e6;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label { color: #ffd43b; }
        .site-footer {
            background: linear-gradient(135deg, #001f3f 0%, #000814 100%);
            color: #e7f5ff;
            padding: 3rem 0 1.5rem;
        }
        .footer-wrapper {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 2rem;
        }
        .footer-col h3 {
            color: #4dabf7;
            margin-bottom: 1.5rem;
            font-size: 1.4rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #1c7ed6;
        }
        .footer-col p { color: #a5d8ff; text-align: left; }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a {
            color: #a5d8ff;
            text-decoration: none;
            transition: color 0.3s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a::before { content: '→'; }
        .footer-links a:hover { color: #74c0fc; text-decoration: underline; }
        friend-link {
            display: block;
            padding: 1rem;
            background-color: rgba(28, 126, 214, 0.1);
            border-radius: 8px;
            margin-bottom: 1rem;
            border-left: 4px solid #1c7ed6;
        }
        friend-link a {
            color: #4dabf7 !important;
            font-weight: bold;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #1c7ed6;
            color: #a5d8ff;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 2rem; }
            h3 { font-size: 1.4rem; }
        }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .hamburger-btn { display: block; }
            .header-wrapper { flex-wrap: wrap; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.8rem; }
            .intro-highlight { padding: 1.2rem; }
            .interactive-module { padding: 1.5rem; }
            .form-grid { grid-template-columns: 1fr; }
        }
        @media (max-width: 480px) {
            .container { padding: 0 15px; }
            .article-content { padding: 0; }
            h1 { font-size: 1.8rem; }
            .logo { font-size: 1.5rem; }
        }