:root {
            --primary: #4361ee;
            --secondary: #3a0ca3;
            --accent: #f72585;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
            --border-radius: 12px;
            --max-width: 1200px;
        }
        * {
            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(--dark);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul, ol {
            list-style-position: inside;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--border-radius);
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .highlight { color: var(--accent); }
        .emoji { font-size: 1.2em; }
        .section-spacing {
            padding: 60px 0;
        }
        .btn {
            display: inline-block;
            padding: 12px 28px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            border-radius: 50px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 18px rgba(67, 97, 238, 0.3);
        }
        .mobile-hidden { display: block; }
        .desktop-hidden { display: none; }
        header {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(to right, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .logo a:hover {
            opacity: 0.9;
        }
        .main-nav ul {
            display: flex;
            gap: 30px;
        }
        .main-nav a {
            font-weight: 600;
            font-size: 1rem;
            padding: 8px 0;
            position: relative;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--accent);
            transition: var(--transition);
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            font-size: 1.5rem;
            cursor: pointer;
            display: none;
        }
        .breadcrumb {
            background-color: #f1f3f9;
            padding: 12px 20px;
            font-size: 0.9rem;
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb span {
            color: var(--gray);
            margin: 0 8px;
        }
        .search-bar {
            background-color: #f8f9ff;
            padding: 25px 0;
        }
        .search-form {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .search-form input {
            flex: 1;
            padding: 16px 24px;
            border: none;
            font-size: 1rem;
            outline: none;
        }
        .search-form button {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            border: none;
            padding: 0 30px;
            cursor: pointer;
            font-weight: 600;
        }
        .search-form button:hover {
            background: linear-gradient(135deg, var(--secondary), var(--primary));
        }
        main {
            min-height: 80vh;
        }
        article {
            max-width: 900px;
            margin: 0 auto;
            padding: 40px 20px;
        }
        h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            color: var(--dark);
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            margin: 50px 0 20px;
            color: var(--secondary);
            border-left: 5px solid var(--accent);
            padding-left: 15px;
        }
        h3 {
            font-size: 1.5rem;
            margin: 30px 0 15px;
            color: var(--primary);
        }
        p {
            margin-bottom: 1.5em;
            font-size: 1.1rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.2rem;
            background: linear-gradient(to right, #f8f9ff, #ffffff);
            padding: 25px;
            border-radius: var(--border-radius);
            border-left: 5px solid var(--primary);
            margin-bottom: 40px;
        }
        .feature-img {
            margin: 40px auto;
            box-shadow: var(--shadow);
            position: relative;
        }
        .feature-img figcaption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 10px;
            font-size: 0.9rem;
        }
        blockquote {
            background: linear-gradient(135deg, #f8f9ff, #e9ecef);
            padding: 30px;
            border-radius: var(--border-radius);
            margin: 40px 0;
            border-left: 5px solid var(--accent);
            font-size: 1.2rem;
            font-style: italic;
        }
        blockquote cite {
            display: block;
            margin-top: 15px;
            font-weight: 600;
            color: var(--secondary);
        }
        .stats-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
            margin: 40px 0;
        }
        .stat-card {
            background: white;
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            text-align: center;
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-10px);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
        .stat-card h4 {
            font-size: 1.8rem;
            color: var(--accent);
        }
        .tip {
            background-color: #e7f9f1;
            border-left: 5px solid #2ecc71;
            padding: 20px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin: 25px 0;
        }
        .warning {
            background-color: #fff8e1;
            border-left: 5px solid #ff9800;
            padding: 20px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin: 25px 0;
        }
        .user-feedback {
            background-color: #f8f9ff;
            padding: 50px 20px;
            margin-top: 60px;
            border-radius: var(--border-radius);
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }
        .feedback-form {
            background: white;
            padding: 30px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .feedback-form h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }
        .star-rating {
            display: flex;
            gap: 10px;
            font-size: 1.8rem;
            color: #ffc107;
            margin: 10px 0;
        }
        .star-rating i {
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating i:hover {
            transform: scale(1.2);
        }
        .longtail-links {
            background-color: #1a1a2e;
            color: white;
            padding: 50px 20px;
        }
        .web-links-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
        }
        .web-link {
            background: rgba(255,255,255,0.05);
            padding: 15px;
            border-radius: 8px;
            transition: var(--transition);
        }
        .web-link:hover {
            background: rgba(255,255,255,0.1);
            transform: translateX(5px);
        }
        .web-link a {
            color: #b3b3ff;
            display: block;
        }
        .web-link a:hover {
            color: white;
        }
        footer {
            background-color: #0f0f1a;
            color: #aaa;
            padding: 40px 20px;
            text-align: center;
        }
        .footer-container {
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .copyright {
            margin-top: 30px;
            padding-top: 20px;
            border-top: 1px solid #333;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            .main-nav ul { gap: 20px; }
        }
        @media (max-width: 768px) {
            .mobile-hidden { display: none; }
            .desktop-hidden { display: block; }
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                background: white;
                box-shadow: 0 10px 20px rgba(0,0,0,0.1);
                padding: 20px;
                transition: var(--transition);
                z-index: 999;
            }
            .main-nav.active {
                left: 0;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 15px;
            }
            .header-container {
                padding: 15px;
            }
            .stats-box {
                grid-template-columns: 1fr;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .btn { padding: 10px 22px; }
            .search-form input { padding: 14px 20px; }
        }