* { 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: #f5f7fa;
            background-image: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            max-width: 100%;
            overflow-x: hidden;
        }
        a { text-decoration: none; color: inherit; transition: color 0.3s ease, transform 0.2s ease; }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style-position: inside; margin-left: 1.2em; }
        input, textarea, select, button { font-family: inherit; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 800; color: #2c3e50; }
        .highlight { background-color: #fffacd; padding: 0 4px; border-radius: 3px; }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .last-updated { font-size: 0.9em; color: #7f8c8d; margin-top: 10px; font-style: italic; }
        header {
            background: linear-gradient(90deg, #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 {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 900;
            font-family: 'Arial Black', sans-serif;
            color: #fff;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
            letter-spacing: 1px;
        }
        .my-logo:hover { transform: scale(1.05); }
        .my-logo span { color: #ffdd40; }
        .main-nav ul {
            display: flex;
            gap: 2rem;
        }
        .main-nav a {
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 5px;
        }
        .main-nav a:hover {
            background-color: rgba(255,255,255,0.15);
            color: #ffdd40;
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            background: none;
            border: none;
            color: white;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background-color: #1a2980;
            padding: 1rem;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            box-shadow: 0 5px 10px rgba(0,0,0,0.2);
            z-index: 999;
        }
        .mobile-nav.active { display: flex; }
        .mobile-nav a {
            padding: 12px 20px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .mobile-nav a:hover { background-color: rgba(255,255,255,0.1); color: #ffdd40; }
        .breadcrumb {
            padding: 15px 20px;
            background-color: #e8f4fc;
            font-size: 0.9rem;
            color: #555;
            border-bottom: 1px solid #d0e3f2;
        }
        .breadcrumb a { color: #2980b9; }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb span { margin: 0 8px; color: #7f8c8d; }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 30px;
            padding: 30px 20px;
            background-color: white;
            margin: 20px auto;
            max-width: 1200px;
            border-radius: 10px;
            box-shadow: 0 5px 25px rgba(0,0,0,0.05);
        }
        @media (max-width: 768px) {
            main { grid-template-columns: 1fr; }
        }
        .article-content {
            padding-right: 20px;
            border-right: 1px solid #eee;
        }
        @media (max-width: 768px) {
            .article-content { border-right: none; padding-right: 0; }
        }
        h1 {
            font-size: 2.8rem;
            color: #1a2980;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #26d0ce;
            padding-bottom: 15px;
        }
        h2 {
            font-size: 2rem;
            color: #2c3e50;
            margin: 2.5rem 0 1rem 0;
            padding-left: 10px;
            border-left: 5px solid #3498db;
        }
        h3 {
            font-size: 1.6rem;
            color: #34495e;
            margin: 2rem 0 0.8rem 0;
        }
        h4 {
            font-size: 1.3rem;
            color: #2c3e50;
            margin: 1.5rem 0 0.6rem 0;
            font-weight: 600;
        }
        p {
            margin-bottom: 1.5em;
            text-align: justify;
            font-size: 1.1rem;
            color: #444;
            line-height: 1.8;
        }
        .intro {
            font-size: 1.3rem;
            color: #2c3e50;
            background-color: #f0f9ff;
            padding: 25px;
            border-radius: 10px;
            border-left: 5px solid #3498db;
            margin-bottom: 2.5rem;
        }
        .article-image {
            margin: 2.5rem auto;
            text-align: center;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            max-width: 800px;
        }
        .article-image img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .article-image img:hover { transform: scale(1.02); }
        .image-caption {
            font-size: 0.95rem;
            color: #666;
            padding: 10px;
            background-color: #f9f9f9;
            font-style: italic;
        }
        .content-link {
            color: #2980b9;
            border-bottom: 1px dashed #2980b9;
            font-weight: 600;
        }
        .content-link:hover {
            color: #1a5276;
            border-bottom: 1px solid #1a5276;
            background-color: #e8f4fc;
        }
        .feature-list {
            background: linear-gradient(145deg, #ffffff, #f0f7ff);
            border-radius: 10px;
            padding: 25px;
            margin: 25px 0;
            border: 1px solid #d6e4f0;
        }
        .feature-list li {
            margin-bottom: 12px;
            padding-left: 10px;
            list-style-type: none;
            position: relative;
        }
        .feature-list li:before {
            content: '✓';
            color: #27ae60;
            font-weight: bold;
            position: absolute;
            left: -20px;
        }
        .sidebar {
            background-color: #f8fafc;
            padding: 25px;
            border-radius: 10px;
            border: 1px solid #e2e8f0;
            height: fit-content;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            color: #1a2980;
            border-bottom: 2px solid #26d0ce;
            padding-bottom: 10px;
            margin-top: 0;
        }
        .sidebar-widget {
            margin-bottom: 30px;
        }
        .link-box {
            background-color: white;
            padding: 15px;
            margin-bottom: 15px;
            border-radius: 8px;
            border-left: 4px solid #3498db;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .link-box:hover {
            transform: translateX(5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        .search-form {
            display: flex;
            margin-bottom: 20px;
        }
        .search-form input {
            flex-grow: 1;
            padding: 12px 15px;
            border: 2px solid #3498db;
            border-radius: 5px 0 0 5px;
            font-size: 1rem;
        }
        .search-form button {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 0 20px;
            border-radius: 0 5px 5px 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background-color 0.3s;
        }
        .search-form button:hover { background-color: #2980b9; }
        .interaction-form {
            background-color: #fff;
            padding: 25px;
            border-radius: 10px;
            border: 1px solid #ddd;
            margin: 40px 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .interaction-form h3 { margin-top: 0; }
        .form-group { margin-bottom: 20px; }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2c3e50;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 1rem;
        }
        .form-group textarea { min-height: 120px; resize: vertical; }
        .star-rating {
            display: flex;
            gap: 10px;
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            margin: 10px 0;
        }
        .star-rating .star:hover,
        .star-rating .star.active { color: #f39c12; }
        .submit-btn {
            background: linear-gradient(to right, #1a2980, #26d0ce);
            color: white;
            border: none;
            padding: 15px 30px;
            font-size: 1.1rem;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
        }
        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(26, 41, 128, 0.3);
        }
        footer {
            background: linear-gradient(90deg, #1a2980, #26d0ce);
            color: white;
            padding: 40px 20px 20px;
            margin-top: 50px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .footer-section h4 {
            color: #ffdd40;
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        .footer-links a {
            display: block;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .footer-links a:hover { color: #ffdd40; padding-left: 5px; }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.1);
            padding: 12px;
            margin-bottom: 10px;
            border-radius: 5px;
            text-align: center;
            font-weight: 600;
        }
        friend-link:hover {
            background-color: rgba(255,255,255,0.2);
            color: #ffdd40;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #bdc3c7;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            .main-nav { display: none; }
            .hamburger { display: block; }
        }
        @media (max-width: 576px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .intro { font-size: 1.1rem; padding: 15px; }
            .interaction-form { padding: 15px; }
        }