* { 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-color: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        a { color: #2a5caa; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #e63946; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .flex { display: flex; }
        .grid { display: grid; }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .highlight { background-color: #fffacd; padding: 2px 4px; border-radius: 3px; }
        .site-header {
            background: linear-gradient(135deg, #1a2980, #26d0ce);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container { justify-content: space-between; align-items: center; }
        .my-logo a {
            font-size: 1.8rem;
            font-weight: 900;
            color: white;
            text-transform: uppercase;
            letter-spacing: 1px;
            font-family: 'Arial Black', sans-serif;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .my-logo a:hover { color: #ffde59; }
        .nav-toggle { display: none; }
        .nav-toggle-label { display: none; }
        .main-nav ul { list-style: none; gap: 2rem; }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
        }
        .main-nav a:hover, .main-nav a.active {
            background-color: rgba(255, 255, 255, 0.2);
            color: #ffde59;
        }
        .breadcrumb {
            background-color: #e9ecef;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a { color: #555; }
        .breadcrumb a:hover { color: #1a2980; }
        .breadcrumb span { color: #888; }
        .featured-image {
            margin: 2rem auto;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
            border: 5px solid white;
        }
        .featured-image img { width: 100%; }
        .content-area {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            .content-area { grid-template-columns: 1fr; }
        }
        article {
            background-color: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        h1 {
            font-size: 2.8rem;
            color: #1a2980;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #26d0ce;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #2a5caa;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px dashed #ccc;
        }
        h3 {
            font-size: 1.5rem;
            color: #e63946;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.2rem;
            color: #555;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .article-intro {
            font-size: 1.3rem;
            color: #444;
            background-color: #f0f8ff;
            padding: 1.5rem;
            border-left: 5px solid #2a5caa;
            border-radius: 0 8px 8px 0;
            margin-bottom: 2.5rem;
        }
        .key-point {
            background: linear-gradient(to right, #e3f2fd, #fce4ec);
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
            border-left: 5px solid #e63946;
        }
        .quote {
            font-style: italic;
            color: #555;
            padding: 1.5rem;
            background-color: #f9f9f9;
            border-left: 4px solid #26d0ce;
            margin: 2rem 0;
        }
        aside.sidebar {
            background-color: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar-widget { margin-bottom: 2rem; }
        .sidebar-widget h3 {
            font-size: 1.3rem;
            color: #1a2980;
            padding-bottom: 0.5rem;
            margin-bottom: 1rem;
            border-bottom: 2px solid #ffde59;
        }
        .link-list { list-style: none; }
        .link-list li { margin-bottom: 0.8rem; }
        .link-list a { display: block; padding: 0.5rem; border-radius: 4px; }
        .link-list a:hover { background-color: #f0f8ff; }
        .user-interaction-form {
            background-color: #f8f9fa;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
            border: 1px solid #dee2e6;
        }
        .form-group { margin-bottom: 1.2rem; }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #444;
        }
        input[type="text"],
        input[type="email"],
        textarea,
        select {
            width: 100%;
            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: #2a5caa;
            box-shadow: 0 0 0 3px rgba(42, 92, 170, 0.1);
        }
        button, .btn {
            background: linear-gradient(to right, #1a2980, #26d0ce);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 6px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        button:hover, .btn:hover {
            background: linear-gradient(to right, #26d0ce, #1a2980);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #ffc107;
            margin: 0.5rem 0;
            cursor: pointer;
        }
        .star-rating i:hover { transform: scale(1.2); }
        .last-updated {
            font-size: 0.9rem;
            color: #777;
            text-align: right;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px solid #eee;
        }
        .site-footer {
            background-color: #1a1a1a;
            color: #ddd;
            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 h3 {
            color: #ffde59;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
        }
        friend-link a {
            color: #26d0ce;
        }
        friend-link a:hover {
            color: #ffde59;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .nav-toggle-label {
                display: block;
                color: white;
                font-size: 1.8rem;
                cursor: pointer;
            }
            .main-nav {
                width: 100%;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease-out;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
                padding-top: 1rem;
            }
            .main-nav li { width: 100%; }
            .main-nav a {
                display: block;
                padding: 1rem;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .nav-toggle:checked ~ .main-nav {
                max-height: 500px;
            }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            article { padding: 1.5rem; }
            .content-area { gap: 1.5rem; }
        }
        @media print {
            .site-header, .sidebar, .user-interaction-form, .site-footer { display: none; }
            body { background: white; color: black; }
            a { color: black; text-decoration: underline; }
            .content-area { grid-template-columns: 1fr; }
        }