* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary: #FF6B00; 
            --secondary: #007AFF; 
            --accent: #34C759; 
            --text: #1C1C1E;
            --light-text: #8E8E93;
            --background: #F9F9FB;
            --card: #FFFFFF;
            --border: #E5E5EA;
        }
        body {
            background-color: var(--background);
            color: var(--text);
            line-height: 1.8;
            padding-bottom: 50px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--card);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo span {
            color: var(--secondary);
        }
        .nav-links {
            display: flex;
            gap: 30px;
        }
        .nav-links a {
            color: var(--text);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-links a:hover {
            color: var(--primary);
        }
        .btn {
            padding: 10px 20px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
        }
        .btn-download {
            background-color: var(--primary);
            color: white;
        }
        .btn-download:hover {
            background-color: #E05A00;
            transform: translateY(-2px);
        }
        .btn-login {
            background-color: var(--secondary);
            color: white;
            margin-left: 10px;
        }
        .btn-login:hover {
            background-color: #0066CC;
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
        }
        .lead {
            padding: 60px 0;
            text-align: center;
            background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
            color: white;
            border-radius: 0 0 30px 30px;
            margin-bottom: 40px;
        }
        .lead h1 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        .lead p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        .toc {
            background-color: var(--card);
            padding: 25px;
            border-radius: 15px;
            margin-bottom: 40px;
            box-shadow: 0 2px 15px rgba(0,0,0,0.05);
        }
        .toc h2 {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: var(--secondary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .toc ul {
            list-style-type: none;
            columns: 2;
            gap: 10px;
        }
        .toc li {
            margin-bottom: 8px;
        }
        .toc a {
            color: var(--text);
            text-decoration: none;
            transition: color 0.3s;
        }
        .toc a:hover {
            color: var(--primary);
            text-decoration: underline;
        }
        section {
            margin-bottom: 60px;
        }
        h2 {
            font-size: 2rem;
            margin-bottom: 25px;
            color: var(--text);
            border-bottom: 3px solid var(--primary);
            padding-bottom: 10px;
            display: inline-block;
        }
        h3 {
            font-size: 1.5rem;
            margin: 30px 0 15px;
            color: var(--secondary);
        }
        p {
            margin-bottom: 20px;
            font-size: 1.05rem;
        }
        .card {
            background-color: var(--card);
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 2px 15px rgba(0,0,0,0.05);
            margin-bottom: 30px;
        }
        .img-container {
            width: 100%;
            height: 400px;
            border-radius: 15px;
            overflow: hidden;
            margin: 30px 0;
            position: relative;
        }
        .img-container img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .img-container:hover img {
            transform: scale(1.03);
        }
        .img-caption {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background-color: rgba(0,0,0,0.7);
            color: white;
            padding: 10px;
            font-size: 0.9rem;
            text-align: center;
        }
        .highlight {
            background-color: rgba(255, 107, 0, 0.1);
            border-left: 4px solid var(--primary);
            padding: 15px;
            margin: 30px 0;
            border-radius: 0 8px 8px 0;
        }
        .highlight strong {
            color: var(--primary);
        }
        .feature-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .feature-item {
            background-color: var(--card);
            padding: 20px;
            border-radius: 15px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }
        .feature-icon {
            font-size: 2rem;
            color: var(--secondary);
            margin-bottom: 15px;
        }
        .feature-item h4 {
            margin-bottom: 10px;
            color: var(--text);
        }
        .bottom-section {
            background-color: var(--card);
            padding: 40px 0;
            border-radius: 30px 30px 0 0;
            margin-top: 60px;
        }
        .categories-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-bottom: 30px;
        }
        .category-group, .tag-group {
            flex: 1;
            min-width: 250px;
        }
        .category-group h3, .tag-group h3 {
            margin-bottom: 15px;
            color: var(--secondary);
        }
        .category-list, .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .category-list a, .tag-list a {
            padding: 8px 15px;
            border-radius: 20px;
            background-color: var(--background);
            color: var(--text);
            text-decoration: none;
            transition: all 0.3s;
            font-size: 0.95rem;
        }
        .category-list a:hover, .tag-list a:hover {
            background-color: var(--primary);
            color: white;
        }
        .recommendation {
            background: linear-gradient(135deg, var(--accent) 0%, var(--secondary) 100%);
            color: white;
            padding: 30px;
            border-radius: 15px;
            margin-bottom: 30px;
            text-align: center;
        }
        .recommendation h3 {
            color: white;
            margin-bottom: 15px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid var(--border);
            color: var(--light-text);
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background-color: var(--card);
                padding: 20px;
                box-shadow: 0 5px 10px rgba(0,0,0,0.1);
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .header-content .btn {
                display: none;
            }
            .lead h1 {
                font-size: 2rem;
            }
            .lead p {
                font-size: 1.1rem;
            }
            .toc ul {
                columns: 1;
            }
            h2 {
                font-size: 1.7rem;
            }
            h3 {
                font-size: 1.3rem;
            }
            .img-container {
                height: 250px;
            }
            .categories-tags {
                flex-direction: column;
            }
        }