* { 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;
            background-image: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #4a6ee0; text-decoration: none; transition: color 0.3s ease, transform 0.2s ease; }
        a:hover { color: #2a4ec4; transform: translateY(-1px); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { padding-left: 1.5em; margin-bottom: 1.5em; }
        li { margin-bottom: 0.5em; }
        p { margin-bottom: 1.5em; text-align: justify; hyphens: auto; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .highlight { background-color: #fffacd; padding: 2px 5px; border-radius: 3px; }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .section-padding { padding: 3rem 0; }
        .shadow { box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08); }
        .rounded { border-radius: 10px; }
        .site-header {
            background: linear-gradient(90deg, #1a237e 0%, #283593 50%, #3949ab 100%);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(45deg, #00e5ff, #00ff95);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
            letter-spacing: -0.5px;
        }
        .my-logo:hover { transform: scale(1.03); }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 1.8rem;
        }
        .main-nav a {
            color: #e3f2fd;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:hover { color: #ffffff; }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: #00e5ff;
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #283593;
                padding: 1rem;
                border-top: 1px solid #3949ab;
                box-shadow: 0 10px 20px rgba(0,0,0,0.2);
            }
            .main-nav.active ul { display: flex; }
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding-left: 0;
            margin-bottom: 0;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 10px;
            color: #7986cb;
        }
        main { flex: 1; }
        .article-header {
            background: linear-gradient(rgba(26, 35, 126, 0.85), rgba(39, 60, 117, 0.9)), url('https://images.unsplash.com/photo-1534423861386-85a16f5d13fd?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80') center/cover no-repeat;
            color: white;
            padding: 4rem 0;
            margin-bottom: 3rem;
            border-bottom: 5px solid #00e5ff;
        }
        .article-header h1 {
            font-size: 3.2rem;
            margin-bottom: 1rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
        }
        .article-header .lead {
            font-size: 1.4rem;
            max-width: 800px;
            opacity: 0.95;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            padding: 1.5rem;
            background-color: white;
            border-radius: 10px;
            margin-bottom: 2.5rem;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
        }
        .last-updated {
            font-style: italic;
            color: #666;
            font-size: 0.95rem;
        }
        .word-count {
            background: #4a6ee0;
            color: white;
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.9rem;
        }
        .content-section {
            background-color: white;
            padding: 2.5rem;
            margin-bottom: 2.5rem;
            border-radius: 10px;
            border-left: 5px solid #4a6ee0;
        }
        h2 {
            color: #1a237e;
            font-size: 2.3rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.7rem;
            border-bottom: 2px dashed #c5cae9;
        }
        h3 {
            color: #283593;
            font-size: 1.8rem;
            margin: 2.2rem 0 1rem;
        }
        h4 {
            color: #3949ab;
            font-size: 1.4rem;
            margin: 1.8rem 0 0.8rem;
        }
        .content-img {
            margin: 2rem auto;
            max-width: 900px;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 0.8rem;
            background: #f5f5f5;
            font-size: 0.9rem;
        }
        .interactive-box {
            background: linear-gradient(135deg, #f0f4ff 0%, #e6f0ff 100%);
            border: 2px solid #bbdefb;
            border-radius: 15px;
            padding: 2rem;
            margin: 2.5rem 0;
        }
        .interactive-box h3 { color: #1565c0; margin-top: 0; }
        form {
            display: grid;
            gap: 1.2rem;
            margin-top: 1.5rem;
        }
        .form-group { display: flex; flex-direction: column; }
        label { margin-bottom: 0.5rem; font-weight: 600; color: #333; }
        input, textarea, select {
            padding: 0.8rem 1rem;
            border: 1px solid #90a4ae;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s, box-shadow 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #4a6ee0;
            box-shadow: 0 0 0 3px rgba(74, 110, 224, 0.2);
        }
        button, .btn {
            background: linear-gradient(45deg, #4a6ee0, #3d5afe);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: all 0.3s ease;
            justify-self: start;
            display: inline-flex;
            align-items: center;
            gap: 0.7rem;
        }
        button:hover, .btn:hover {
            background: linear-gradient(45deg, #3d5afe, #304ffe);
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(74, 110, 224, 0.3);
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            direction: rtl;
            font-size: 1.8rem;
        }
        .star-rating input { display: none; }
        .star-rating label {
            color: #ccc;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover ~ label,
        .star-rating input:checked ~ label { color: #ffc107; }
        .site-footer {
            background: #1a237e;
            color: #e8eaf6;
            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-section h3 {
            color: #bbdefb;
            font-size: 1.4rem;
            margin-bottom: 1.2rem;
        }
        .footer-links { list-style: none; padding-left: 0; }
        .footer-links li { margin-bottom: 0.7rem; }
        .footer-links a {
            color: #c5cae9;
            display: flex;
            align-items: center;
            gap: 0.7rem;
        }
        .footer-links a:hover { color: #ffffff; }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 0.8rem 1.2rem;
            border-radius: 8px;
            margin: 0.3rem;
            border: 1px solid #3949ab;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #9fa8da;
        }
        @media (max-width: 992px) {
            .article-header h1 { font-size: 2.7rem; }
            h2 { font-size: 2rem; }
            h3 { font-size: 1.6rem; }
            .content-section { padding: 2rem; }
        }
        @media (max-width: 768px) {
            .header-content { flex-wrap: wrap; }
            .article-header { padding: 3rem 0; }
            .article-header h1 { font-size: 2.2rem; }
            .article-header .lead { font-size: 1.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .article-meta { flex-direction: column; align-items: flex-start; }
            .footer-content { grid-template-columns: 1fr; }
        }
        @media (max-width: 480px) {
            .container { padding: 0 15px; }
            .article-header h1 { font-size: 1.9rem; }
            .content-section { padding: 1.5rem; }
            button, .btn { width: 100%; justify-content: center; }
        }