:root {
            --primary-color: #1e3a8a;
            --secondary-color: #dc2626;
            --accent-color: #fbbf24;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --bg-light: #f9fafb;
            --bg-white: #ffffff;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --border-radius: 8px;
            --transition: all 0.3s ease;
        }
        * {
            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: var(--text-dark);
            background-color: var(--bg-light);
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--bg-white);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .logo span {
            color: var(--secondary-color);
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .desktop-nav a {
            font-weight: 600;
            font-size: 1.05rem;
            padding: 5px 0;
            position: relative;
        }
        .desktop-nav a:hover {
            color: var(--secondary-color);
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--secondary-color);
            transition: width 0.3s;
        }
        .desktop-nav a:hover::after {
            width: 100%;
        }
        .mobile-toggle {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: var(--primary-color);
            cursor: pointer;
        }
        .mobile-nav {
            position: fixed;
            top: 0;
            right: -100%;
            width: 280px;
            height: 100vh;
            background-color: var(--bg-white);
            box-shadow: -5px 0 15px rgba(0,0,0,0.1);
            transition: right 0.4s ease-in-out;
            z-index: 1001;
            padding: 30px 20px;
        }
        .mobile-nav.active {
            right: 0;
        }
        .mobile-nav ul {
            list-style: none;
            margin-top: 40px;
        }
        .mobile-nav li {
            margin-bottom: 20px;
        }
        .mobile-nav a {
            font-size: 1.2rem;
            font-weight: 600;
            display: block;
            padding: 10px;
            border-radius: var(--border-radius);
        }
        .mobile-nav a:hover {
            background-color: var(--bg-light);
            color: var(--secondary-color);
        }
        .close-menu {
            position: absolute;
            top: 20px;
            right: 20px;
            font-size: 1.8rem;
            background: none;
            border: none;
            cursor: pointer;
            color: var(--text-light);
        }
        .overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            z-index: 1000;
        }
        .overlay.active {
            display: block;
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: #e5e7eb;
            font-size: 0.9rem;
            margin-bottom: 30px;
        }
        .breadcrumb a {
            color: var(--primary-color);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 30px 0;
            background-color: var(--bg-white);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin-bottom: 40px;
        }
        article {
            padding: 0 30px;
        }
        h1 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
            line-height: 1.2;
            border-left: 5px solid var(--accent-color);
            padding-left: 15px;
        }
        h2 {
            font-size: 2rem;
            margin: 40px 0 20px;
            color: var(--text-dark);
            padding-bottom: 10px;
            border-bottom: 2px solid #e5e7eb;
        }
        h3 {
            font-size: 1.5rem;
            margin: 30px 0 15px;
            color: var(--primary-color);
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--text-light);
            margin-bottom: 30px;
        }
        .highlight {
            background-color: #fef3c7;
            border-left: 4px solid var(--accent-color);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .code-box {
            background-color: #1f2937;
            color: #f3f4f6;
            padding: 25px;
            border-radius: var(--border-radius);
            margin: 25px 0;
            font-family: 'Courier New', monospace;
            overflow-x: auto;
        }
        .code-box h3 {
            color: var(--accent-color);
            margin-top: 0;
        }
        .code-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px;
            background-color: #374151;
            margin-bottom: 10px;
            border-radius: 5px;
            flex-wrap: wrap;
            gap: 10px;
        }
        .code {
            font-size: 1.3rem;
            letter-spacing: 1.5px;
            font-weight: bold;
        }
        .reward {
            color: #34d399;
            font-weight: 600;
        }
        .btn {
            display: inline-block;
            padding: 12px 24px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: #b91c1c;
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(220, 38, 38, 0.2);
        }
        .btn-copy {
            background-color: var(--primary-color);
            padding: 8px 16px;
            font-size: 0.9rem;
        }
        .btn-copy:hover {
            background-color: #1e40af;
        }
        .featured-image {
            margin: 30px auto;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .featured-image figcaption {
            text-align: center;
            font-style: italic;
            color: var(--text-light);
            padding: 10px;
            background-color: #f8fafc;
        }
        .form-section {
            background-color: #f8fafc;
            padding: 30px;
            border-radius: var(--border-radius);
            margin: 40px 0;
        }
        .form-title {
            margin-top: 0;
            color: var(--primary-color);
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #d1d5db;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
        }
        .star-rating {
            display: flex;
            gap: 10px;
            font-size: 1.8rem;
            color: #d1d5db;
            cursor: pointer;
            margin: 10px 0;
        }
        .star-rating .star {
            transition: color 0.2s;
        }
        .star-rating .star:hover,
        .star-rating .star.active {
            color: var(--accent-color);
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
            margin: 40px 0;
        }
        .web-link {
            background-color: var(--bg-white);
            border: 1px solid #e5e7eb;
            padding: 15px;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .web-link:hover {
            border-color: var(--primary-color);
            box-shadow: var(--shadow);
        }
        .web-link a {
            color: var(--primary-color);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .web-link a:hover {
            color: var(--secondary-color);
        }
        footer {
            background-color: #111827;
            color: #d1d5db;
            padding: 40px 0 20px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: white;
            margin-bottom: 15px;
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.2rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a:hover {
            color: var(--accent-color);
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #374151;
            font-size: 0.9rem;
            color: #9ca3af;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            article { padding: 0 20px; }
        }
        @media (max-width: 768px) {
            .desktop-nav { display: none; }
            .mobile-toggle { display: block; }
            h1 { font-size: 1.9rem; }
            h2 { font-size: 1.6rem; }
            h3 { font-size: 1.3rem; }
            .header-top { padding: 12px 0; }
            .code-item { flex-direction: column; align-items: flex-start; }
            .btn-copy { align-self: flex-end; }
            .web-links { grid-template-columns: 1fr; }
            .footer-content { grid-template-columns: 1fr; text-align: center; }
        }
        @media (max-width: 480px) {
            .container { padding: 0 15px; }
            h1 { font-size: 1.7rem; }
            .form-section { padding: 20px; }
            .code-box { padding: 15px; }
        }