* { 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, #f5f7fa 0%, #f0f4f8 100%);
            background-attachment: fixed;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-family: 'Georgia', serif; color: #2c3e50; margin-bottom: 1rem; line-height: 1.3; }
        h1 { font-size: clamp(2.5rem, 5vw, 3.8rem); border-bottom: 4px solid #e74c3c; padding-bottom: 0.5rem; margin-top: 1.5rem; }
        h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); color: #3498db; margin-top: 2.5rem; padding-left: 0.5rem; border-left: 5px solid #3498db; }
        h3 { font-size: clamp(1.4rem, 3vw, 1.8rem); color: #2ecc71; margin-top: 2rem; }
        h4 { font-size: 1.3rem; color: #9b59b6; margin-top: 1.5rem; }
        p { margin-bottom: 1.5rem; text-align: justify; hyphens: auto; }
        .lead { font-size: 1.3rem; color: #555; font-weight: 300; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.5rem; border-radius: 3px; }
        .term { font-style: italic; color: #2980b9; font-weight: bold; }
        .stats { font-family: 'Courier New', monospace; background-color: #2c3e50; color: white; padding: 1rem; border-radius: 8px; margin: 1.5rem 0; }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        main.container { padding-top: 2rem; padding-bottom: 3rem; }
        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-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-family: 'Trebuchet MS', sans-serif;
            font-size: 2.2rem;
            font-weight: bold;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: transform 0.3s ease;
        }
        .my-logo:hover { transform: scale(1.05); }
        .my-logo i { color: #FFD700; }
        nav { display: flex; align-items: center; }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
            transition: all 0.3s ease;
            position: relative;
        }
        .nav-links a:hover, .nav-links a:focus {
            background-color: rgba(255,255,255,0.2);
            transform: translateY(-2px);
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: #FFD700;
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }
        .nav-links a:hover::after { width: 80%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #ecf0f1;
            border-radius: 0 0 8px 8px;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 0.5rem;
        }
        .breadcrumb a { color: #3498db; text-decoration: none; }
        .breadcrumb a:hover { text-decoration: underline; }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.5rem;
            color: #7f8c8d;
        }
        .article-content { background-color: white; padding: 2.5rem; border-radius: 15px; box-shadow: 0 10px 30px rgba(0,0,0,0.05); }
        .intro { font-size: 1.2rem; margin-bottom: 2.5rem; padding-bottom: 1.5rem; border-bottom: 2px dashed #bdc3c7; }
        .featured-img {
            width: 80%;
            margin: 2.5rem auto;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 15px 25px rgba(0,0,0,0.1);
            transition: transform 0.5s ease;
        }
        .featured-img:hover { transform: translateY(-10px); }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #7f8c8d;
            padding: 0.8rem;
            background-color: #f8f9fa;
            border-top: 1px solid #eee;
        }
        .internal-links {
            background-color: #e8f4fc;
            border-left: 5px solid #3498db;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 10px 10px 0;
        }
        .internal-links ul { list-style-position: inside; columns: 2; }
        .internal-links li { margin-bottom: 0.7rem; }
        .internal-links a { color: #2c3e50; font-weight: 500; }
        .internal-links a:hover { color: #e74c3c; text-decoration: underline; }
        .interactive-box {
            background: #f8f9fa;
            border: 2px solid #dee2e6;
            border-radius: 12px;
            padding: 2rem;
            margin: 3rem 0;
            text-align: center;
        }
        .interactive-box h3 { margin-top: 0; }
        .form-group { margin-bottom: 1.5rem; text-align: left; }
        label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #495057; }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s ease, box-shadow 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #80bdff;
            box-shadow: 0 0 0 0.2rem rgba(0,123,255,0.25);
        }
        .btn {
            display: inline-block;
            background: linear-gradient(to right, #3498db, #2ecc71);
            color: white;
            padding: 0.9rem 2rem;
            border: none;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(52, 152, 219, 0.5);
            background: linear-gradient(to right, #2980b9, #27ae60);
        }
        .star-rating { direction: rtl; display: inline-block; font-size: 2rem; }
        .star-rating input { display: none; }
        .star-rating label { color: #ddd; cursor: pointer; padding: 0 0.1rem; }
        .star-rating label:hover,
        .star-rating label:hover ~ label,
        .star-rating input:checked ~ label { color: #FFD700; }
        footer {
            background: linear-gradient(90deg, #2c3e50, #34495e);
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 { color: #FFD700; border-bottom: 2px solid #FFD700; padding-bottom: 0.5rem; margin-bottom: 1.5rem; }
        .friend-links { list-style: none; }
        .friend-links li { margin-bottom: 0.8rem; }
        .friend-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s ease;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .friend-links a:hover { color: #3498db; }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #4a6278;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .nav-links { gap: 1rem; }
            .internal-links ul { columns: 1; }
        }
        @media (max-width: 768px) {
            .header-inner { flex-direction: column; align-items: flex-start; }
            nav { width: 100%; margin-top: 1rem; }
            .nav-links {
                flex-direction: column;
                width: 100%;
                display: none;
                gap: 0;
            }
            .nav-links.active { display: flex; }
            .nav-links li { width: 100%; }
            .nav-links a { display: block; padding: 1rem; border-radius: 0; border-bottom: 1px solid rgba(255,255,255,0.1); }
            .hamburger { display: block; align-self: flex-end; margin-top: -3.5rem; }
            .article-content { padding: 1.5rem; }
            .featured-img { width: 100%; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2.2rem; }
            .container { padding-left: 1rem; padding-right: 1rem; }
            .btn { width: 100%; }
        }