* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: #2d3748;
            background-color: #f9fafb;
            max-width: 120rem;
            margin: 0 auto;
            padding: 0 1rem;
        }
        a { color: #4f46e5; text-decoration: none; transition: color 0.2s ease; }
        a:hover { color: #3730a3; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { padding-left: 1.5rem; }
        .container { width: 100%; margin: 0 auto; }
        .site-header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 1.5rem 1rem;
            border-bottom-left-radius: 1rem;
            border-bottom-right-radius: 1rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 1.5rem;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: white;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .my-logo i { font-size: 2.5rem; }
        .main-nav ul {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 1.75rem;
        }
        .main-nav a {
            color: #e2e8f0;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: white;
            text-decoration: none;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: #fbbf24;
            border-radius: 2px;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #edf2f7;
            padding: 0.8rem 1rem;
            border-radius: 0.5rem;
            margin: 1.5rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #4a5568; }
        .breadcrumb span { color: #718096; }
        .search-container {
            background: white;
            padding: 2rem;
            border-radius: 1rem;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
            margin: 2rem 0;
            text-align: center;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 1rem auto 0;
        }
        .search-form input[type="search"] {
            flex-grow: 1;
            padding: 0.9rem 1.2rem;
            border: 2px solid #cbd5e0;
            border-radius: 0.5rem 0 0 0.5rem;
            font-size: 1rem;
        }
        .search-form button {
            background: #4f46e5;
            color: white;
            border: none;
            padding: 0 1.8rem;
            border-radius: 0 0.5rem 0.5rem 0;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background 0.2s;
        }
        .search-form button:hover { background: #4338ca; }
        .content-area {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2.5rem 0;
        }
        article {
            background: white;
            padding: 2.5rem;
            border-radius: 1rem;
            box-shadow: 0 4px 16px rgba(0,0,0,0.06);
        }
        .article-meta {
            color: #718096;
            font-size: 0.95rem;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #e2e8f0;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
        }
        h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            color: #1a202c;
            margin-bottom: 1.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #2d3748;
            margin-top: 3rem;
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
        }
        h3 {
            font-size: 1.6rem;
            color: #4a5568;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #5a67d8;
            margin-top: 2rem;
            margin-bottom: 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.25rem;
            color: #4a5568;
            font-weight: 500;
            margin-bottom: 2rem;
            padding: 1.2rem;
            background-color: #f0f9ff;
            border-left: 4px solid #3b82f6;
            border-radius: 0 0.5rem 0.5rem 0;
        }
        .highlight-box {
            background: linear-gradient(to right, #fef3c7, #fde68a);
            border-left: 5px solid #f59e0b;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 0.5rem 0.5rem 0;
        }
        .img-container {
            margin: 2.5rem auto;
            text-align: center;
        }
        .img-container img {
            border-radius: 1rem;
            box-shadow: 0 8px 25px rgba(0,0,0,0.12);
            max-width: 800px;
            margin: 0 auto;
        }
        .caption {
            font-size: 0.9rem;
            color: #718096;
            margin-top: 0.5rem;
            font-style: italic;
        }
        blockquote {
            border-left: 4px solid #a78bfa;
            padding-left: 1.5rem;
            margin: 2rem 0;
            color: #6b7280;
            font-style: italic;
        }
        aside {
            background: white;
            padding: 1.8rem;
            border-radius: 1rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.06);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget h3 {
            font-size: 1.3rem;
            margin-top: 0;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
        }
        .related-links ul {
            list-style: none;
            padding-left: 0;
        }
        .related-links li {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px dashed #e2e8f0;
        }
        .related-links a {
            display: flex;
            align-items: center;
            gap: 0.7rem;
        }
        .related-links i {
            color: #8b5cf6;
            font-size: 0.9rem;
        }
        .interactive-module {
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: 1rem;
            padding: 2rem;
            margin: 3rem 0;
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            margin-bottom: 1.5rem;
            color: #1e40af;
        }
        .rating-container {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            margin-top: 1.5rem;
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #cbd5e0;
            cursor: pointer;
        }
        .stars .active { color: #fbbf24; }
        .stars:hover .star { color: #fbbf24; }
        .star:hover ~ .star { color: #cbd5e0; }
        form label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        form input,
        form textarea,
        form select {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1.2rem;
            border: 1px solid #cbd5e0;
            border-radius: 0.5rem;
            font-family: inherit;
            font-size: 1rem;
        }
        form textarea { min-height: 120px; resize: vertical; }
        .form-submit {
            background: #10b981;
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 0.5rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .form-submit:hover { background: #0da271; }
        footer {
            background: #1f2937;
            color: #f3f4f6;
            padding: 3rem 1rem;
            margin-top: 4rem;
            border-top-left-radius: 1rem;
            border-top-right-radius: 1rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-widget h4 {
            color: #fbbf24;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        friend-link {
            display: inline-block;
            background: #374151;
            color: #d1d5db;
            padding: 0.5rem 1rem;
            margin: 0.3rem;
            border-radius: 0.375rem;
            font-size: 0.9rem;
            transition: all 0.2s;
        }
        friend-link:hover {
            background: #4f46e5;
            color: white;
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #374151;
            color: #9ca3af;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .content-area { grid-template-columns: 1fr; }
            aside { position: static; }
        }
        @media (max-width: 768px) {
            .header-container { flex-direction: column; align-items: stretch; }
            .main-nav ul { flex-direction: column; display: none; gap: 0; }
            .main-nav.active ul {
                display: flex;
                margin-top: 1rem;
                padding-top: 1rem;
                border-top: 1px solid rgba(255,255,255,0.2);
            }
            .hamburger { display: block; align-self: flex-end; margin-top: -3rem; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            article, .search-container { padding: 1.5rem; }
        }