* { 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%, #e4e8ed 100%);
            background-attachment: fixed;
        }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .main-header {
            background: linear-gradient(90deg, #1a237e 0%, #283593 50%, #3949ab 100%);
            color: white;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            text-decoration: none;
            color: #FFD700;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover { color: #fff; transform: scale(1.03); }
        .my-logo i { font-size: 2rem; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        .main-nav a {
            color: #e3f2fd;
            text-decoration: none;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .main-nav a:hover, .main-nav a.active {
            background-color: rgba(255, 255, 255, 0.2);
            color: #FFD700;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
            padding: 5px;
        }
        .breadcrumb {
            padding: 12px 0;
            background-color: #edf2f7;
            font-size: 0.9rem;
            border-bottom: 1px solid #cbd5e0;
        }
        .breadcrumb a {
            color: #4a5568;
            text-decoration: none;
        }
        .breadcrumb a:hover { text-decoration: underline; color: #1a237e; }
        .breadcrumb span { color: #718096; }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 30px 0;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
        }
        article {
            background-color: white;
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 20px;
            line-height: 1.2;
            border-bottom: 3px solid #FFD700;
            padding-bottom: 15px;
        }
        h2 { font-size: 2rem; color: #283593; margin: 35px 0 15px; padding-top: 10px; }
        h3 { font-size: 1.5rem; color: #3949ab; margin: 25px 0 10px; }
        h4 { font-size: 1.2rem; color: #5c6bc0; margin: 20px 0 10px; }
        p { margin-bottom: 1.2em; text-align: justify; }
        .lead {
            font-size: 1.2rem;
            font-weight: 600;
            color: #4a5568;
            background-color: #f7f9fc;
            padding: 20px;
            border-left: 5px solid #3949ab;
            border-radius: 0 8px 8px 0;
            margin-bottom: 30px;
        }
        .highlight {
            background-color: #fffde7;
            padding: 20px;
            border-radius: 8px;
            border: 1px solid #ffeb3b;
            margin: 25px 0;
        }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .keyword { color: #d32f2f; font-weight: 700; }
        .last-updated {
            font-style: italic;
            color: #718096;
            text-align: right;
            font-size: 0.9rem;
            margin-top: 30px;
            padding-top: 15px;
            border-top: 1px dashed #cbd5e0;
        }
        .article-img {
            margin: 30px auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            max-width: 800px;
        }
        .article-img figcaption {
            text-align: center;
            font-size: 0.9rem;
            color: #666;
            padding: 10px;
            background-color: #f9f9f9;
        }
        .interactive-box {
            background: linear-gradient(145deg, #e3f2fd, #f3e5f5);
            border-radius: 12px;
            padding: 25px;
            margin: 30px 0;
            border: 1px solid #bbdefb;
        }
        .interactive-box h3 { color: #7b1fa2; margin-top: 0; }
        form { display: flex; flex-direction: column; gap: 15px; }
        input, textarea, select {
            padding: 12px 15px;
            border: 1px solid #cbd5e0;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #3949ab;
            box-shadow: 0 0 0 3px rgba(57, 73, 171, 0.2);
        }
        button {
            background: linear-gradient(90deg, #1a237e, #3949ab);
            color: white;
            border: none;
            padding: 14px 20px;
            border-radius: 6px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        button:hover {
            background: linear-gradient(90deg, #3949ab, #1a237e);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        .star-rating {
            display: flex;
            gap: 5px;
            direction: rtl;
            justify-content: center;
        }
        .star-rating input { display: none; }
        .star-rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label { color: #FFD700; }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 25px;
        }
        .sidebar-widget {
            background-color: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .sidebar-widget h3 {
            color: #1a237e;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #FFD700;
        }
        .related-links ul {
            list-style: none;
        }
        .related-links li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px dotted #e2e8f0;
        }
        .related-links a {
            color: #4a5568;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: all 0.3s;
        }
        .related-links a:hover {
            color: #1a237e;
            padding-left: 5px;
        }
        .related-links i { color: #3949ab; }
        .main-footer {
            background: linear-gradient(90deg, #1a237e, #0d1533);
            color: #e2e8f0;
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h4 {
            color: #FFD700;
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        friend-link {
            display: block;
            margin-bottom: 10px;
        }
        friend-link a {
            color: #cbd5e0;
            text-decoration: none;
            transition: color 0.3s;
        }
        friend-link a:hover { color: #FFD700; text-decoration: underline; }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #2d3748;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 80%;
                height: calc(100vh - 70px);
                background-color: #1a237e;
                flex-direction: column;
                padding: 30px;
                transition: left 0.5s ease;
                box-shadow: 5px 0 15px rgba(0,0,0,0.2);
            }
            .main-nav.active { left: 0; }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav a {
                display: block;
                padding: 15px;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            article { padding: 25px; }
            .header-content { flex-wrap: wrap; }
        }