* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #1a365d;
            --secondary-color: #e53e3e;
            --accent-color: #f6ad55;
            --text-dark: #2d3748;
            --text-light: #f7fafc;
            --bg-light: #f8f9fa;
            --bg-section: #edf2f7;
            --border-color: #cbd5e0;
        }
        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);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--primary-color);
            color: var(--text-light);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .logo a {
            color: var(--accent-color);
            text-decoration: none;
            transition: color 0.3s;
        }
        .logo a:hover {
            color: var(--secondary-color);
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .desktop-nav a {
            color: var(--text-light);
            text-decoration: none;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 0;
            position: relative;
            transition: color 0.3s;
        }
        .desktop-nav a:hover {
            color: var(--accent-color);
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--accent-color);
            transition: width 0.3s ease;
        }
        .desktop-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 4px;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background-color: var(--text-light);
            transition: 0.3s;
        }
        .mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background-color: var(--primary-color);
            flex-direction: column;
            padding: 1rem 0;
            box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            width: 100%;
        }
        .mobile-nav li {
            width: 100%;
        }
        .mobile-nav a {
            color: var(--text-light);
            text-decoration: none;
            font-weight: 600;
            display: block;
            padding: 0.8rem 2rem;
            transition: background-color 0.3s;
        }
        .mobile-nav a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background-color: var(--bg-section);
            padding: 0.8rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a {
            color: var(--primary-color);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 2rem 0;
        }
        .article-header {
            text-align: center;
            margin-bottom: 3rem;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        .article-meta {
            color: #718096;
            font-size: 0.95rem;
            margin-bottom: 1.5rem;
        }
        .featured-image {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: 10px;
            margin: 2rem 0;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
            transition: transform 0.5s ease;
        }
        .featured-image:hover {
            transform: scale(1.01);
        }
        .content-section {
            margin-bottom: 3rem;
            padding: 2rem;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid var(--accent-color);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--secondary-color);
            margin: 1.8rem 0 1rem;
        }
        p {
            margin-bottom: 1.2rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight {
            background-color: #fffaf0;
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .key-points {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .point-card {
            background-color: var(--bg-section);
            padding: 1.5rem;
            border-radius: 8px;
            border-top: 4px solid var(--secondary-color);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .point-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .point-card i {
            color: var(--secondary-color);
            font-size: 1.8rem;
            margin-bottom: 1rem;
        }
        .download-box {
            background: linear-gradient(135deg, var(--primary-color), #2d5288);
            color: white;
            padding: 2.5rem;
            border-radius: 12px;
            text-align: center;
            margin: 3rem 0;
            position: relative;
            overflow: hidden;
        }
        .download-box::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
            background-size: 20px 20px;
            animation: float 20s linear infinite;
            z-index: 0;
        }
        @keyframes float {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .download-content {
            position: relative;
            z-index: 1;
        }
        .btn-download {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            padding: 1rem 2.5rem;
            font-size: 1.3rem;
            font-weight: 700;
            text-decoration: none;
            border-radius: 50px;
            margin-top: 1.5rem;
            transition: all 0.3s;
            box-shadow: 0 6px 0 #c53030;
        }
        .btn-download:hover {
            background-color: #c53030;
            transform: translateY(-3px);
            box-shadow: 0 9px 0 #9b2c2c;
        }
        .btn-download:active {
            transform: translateY(1px);
            box-shadow: 0 4px 0 #9b2c2c;
        }
        .interaction-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .interaction-card {
            background-color: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }
        .interaction-card h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(246, 173, 85, 0.2);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            font-size: 2rem;
            gap: 5px;
            margin: 1rem 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: var(--accent-color);
        }
        .btn-submit {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 6px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        .btn-submit:hover {
            background-color: #2d5288;
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 3rem 0;
            padding: 2rem;
            background-color: var(--bg-section);
            border-radius: 10px;
        }
        .web-link {
            background-color: white;
            padding: 1rem 1.5rem;
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s;
        }
        .web-link:hover {
            transform: translateY(-3px);
        }
        .web-link a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            display: block;
        }
        .web-link a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }
        footer {
            background-color: var(--primary-color);
            color: var(--text-light);
            padding: 3rem 0 1.5rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: var(--accent-color);
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
            border-bottom: 2px solid rgba(255,255,255,0.1);
            padding-bottom: 0.5rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #cbd5e0;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: var(--accent-color);
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.95rem;
            color: #a0aec0;
        }
        @media (max-width: 992px) {
            h1 {
                font-size: 2.4rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: flex;
            }
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 15px;
            }
            h1 {
                font-size: 2rem;
            }
            .content-section {
                padding: 1.5rem;
            }
            .key-points {
                grid-template-columns: 1fr;
            }
            .interaction-section {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .download-box {
                padding: 1.5rem;
            }
            .btn-download {
                padding: 0.8rem 1.8rem;
                font-size: 1.1rem;
            }
        }