* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary: #2c3e50;
            --secondary: #e74c3c;
            --accent: #3498db;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --success: #27ae60;
            --warning: #f39c12;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --border-radius: 8px;
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f9f9f9;
            color: #333;
            line-height: 1.7;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: var(--primary);
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            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;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--secondary);
            transform: rotate(-20deg);
        }
        .my-logo:hover {
            color: var(--light);
        }
        .breadcrumb {
            background-color: #f1f1f1;
            padding: 12px 20px;
            font-size: 0.9rem;
            margin-bottom: 2rem;
            border-radius: var(--border-radius);
        }
        .breadcrumb a {
            color: #555;
        }
        .breadcrumb a:hover {
            color: var(--secondary);
        }
        .breadcrumb span {
            color: #777;
            margin: 0 8px;
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            color: var(--light);
            font-weight: 500;
            padding: 8px 0;
            position: relative;
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: var(--secondary);
            transition: width 0.3s;
        }
        .nav-desktop a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 5px;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background-color: white;
            border-radius: 2px;
            transition: var(--transition);
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: var(--dark);
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: var(--shadow);
            z-index: 999;
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: white;
            padding: 12px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .main-content {
            flex: 1;
            padding: 2rem 0;
        }
        article {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 3rem;
            box-shadow: var(--shadow);
            margin-bottom: 3rem;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary);
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 5px solid var(--secondary);
            padding-left: 20px;
        }
        h2 {
            font-size: 2rem;
            color: var(--dark);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--primary);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #555;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            color: #444;
            font-weight: 500;
            margin-bottom: 2.5rem;
            padding: 1rem;
            background-color: #f8f9fa;
            border-radius: var(--border-radius);
            border-left: 4px solid var(--accent);
        }
        .highlight {
            background-color: #fff9e6;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            border: 1px dashed var(--warning);
            margin: 2rem 0;
        }
        .quote {
            font-style: italic;
            padding: 2rem;
            background-color: #f0f7ff;
            border-radius: var(--border-radius);
            border-left: 5px solid var(--accent);
            margin: 2.5rem 0;
        }
        .quote-author {
            text-align: right;
            font-weight: bold;
            color: var(--primary);
            margin-top: 1rem;
        }
        .bold {
            font-weight: 700;
            color: var(--primary);
        }
        .emoji {
            font-size: 1.2em;
            margin: 0 3px;
        }
        .last-updated {
            text-align: right;
            font-size: 0.9rem;
            color: #777;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px solid #eee;
        }
        .article-image {
            width: 80%;
            margin: 2.5rem auto;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
        }
        .article-image figcaption {
            text-align: center;
            font-style: italic;
            padding: 10px;
            background-color: #f5f5f5;
            color: #666;
        }
        .function-boxes {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .function-box {
            background-color: white;
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .function-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
        }
        .function-box h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .function-box form {
            display: flex;
            flex-direction: column;
            gap: 15px;
            margin-top: 1.5rem;
        }
        .function-box input,
        .function-box textarea,
        .function-box select {
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .function-box input:focus,
        .function-box textarea:focus,
        .function-box select:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        .function-box button {
            background-color: var(--accent);
            color: white;
            border: none;
            padding: 14px;
            border-radius: var(--border-radius);
            font-weight: bold;
            cursor: pointer;
            transition: var(--transition);
        }
        .function-box button:hover {
            background-color: var(--primary);
        }
        .stars {
            display: flex;
            gap: 8px;
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            margin-bottom: 1rem;
        }
        .stars .star:hover,
        .stars .star.active {
            color: var(--warning);
        }
        .related-links {
            background-color: #f1f8ff;
            padding: 2.5rem;
            border-radius: var(--border-radius);
            margin: 3rem 0;
        }
        .related-links h3 {
            margin-top: 0;
        }
        .related-links ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
        }
        .related-links li {
            padding: 10px 0;
            border-bottom: 1px dashed #cce0ff;
        }
        .related-links a::before {
            content: '♠';
            margin-right: 10px;
            color: var(--secondary);
        }
        .site-footer {
            background-color: var(--primary);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 2.5rem;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.4rem;
        }
        .footer-section a {
            color: #ddd;
            display: block;
            margin-bottom: 10px;
        }
        .footer-section a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255, 255, 255, 0.05);
            padding: 15px;
            margin-bottom: 10px;
            border-radius: 5px;
            transition: var(--transition);
        }
        friend-link:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            article { padding: 2rem; }
        }
        @media (max-width: 768px) {
            .header-content { flex-wrap: wrap; }
            .nav-desktop { display: none; }
            .hamburger { display: flex; }
            .article-image { width: 100%; }
            .function-boxes { grid-template-columns: 1fr; }
            h1 { font-size: 2rem; padding-left: 15px; }
            article { padding: 1.5rem; }
        }
        @media (max-width: 576px) {
            .container { padding: 0 15px; }
            h1 { font-size: 1.8rem; }
            .lead { font-size: 1.1rem; }
            .related-links ul { grid-template-columns: 1fr; }
        }
        @media print {
            .site-header, .breadcrumb, .function-boxes, .site-footer, .nav-desktop, .hamburger {
                display: none !important;
            }
            body { background: white; }
            article { box-shadow: none; padding: 0; }
        }