:root {
            --primary-color: #4a6fa5;
            --secondary-color: #ff9900;
            --accent-color: #6d5acf;
            --text-color: #333;
            --light-bg: #f8f9fa;
            --dark-bg: #2c3e50;
            --success-color: #27ae60;
            --warning-color: #f39c12;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --border-radius: 12px;
            --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: 1.8;
            color: var(--text-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--dark-bg), var(--primary-color));
            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;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: 1px;
        }
        .logo i {
            color: var(--secondary-color);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 1rem;
            border-radius: 6px;
            transition: var(--transition);
        }
        .nav-desktop a:hover {
            background-color: rgba(255,255,255,0.15);
            transform: translateY(-2px);
        }
        .nav-desktop a.active {
            background-color: var(--secondary-color);
            color: var(--dark-bg);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: var(--dark-bg);
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: var(--shadow);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: white;
            text-decoration: none;
            padding: 1rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            transition: var(--transition);
        }
        .nav-mobile a:hover {
            background-color: rgba(255,255,255,0.1);
            padding-left: 1.5rem;
        }
        .breadcrumb {
            background-color: var(--light-bg);
            padding: 1rem 0;
            margin-bottom: 2rem;
        }
        .breadcrumb ul {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 0.5rem;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
        }
        .breadcrumb a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb i {
            margin: 0 0.5rem;
            color: #888;
            font-size: 0.9rem;
        }
        main {
            padding: 2rem 0;
        }
        article {
            background: white;
            border-radius: var(--border-radius);
            padding: 2.5rem;
            box-shadow: var(--shadow);
            margin-bottom: 3rem;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--dark-bg);
            margin-bottom: 1.5rem;
            line-height: 1.3;
            border-left: 6px solid var(--secondary-color);
            padding-left: 1.5rem;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-color);
            margin: 2.5rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--light-bg);
        }
        h3 {
            font-size: 1.5rem;
            color: var(--accent-color);
            margin: 2rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight {
            background-color: #fff9e6;
            border-left: 4px solid var(--warning-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .highlight p:last-child {
            margin-bottom: 0;
        }
        .term {
            font-weight: bold;
            color: var(--primary-color);
        }
        .feature-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: var(--border-radius);
            margin: 2.5rem auto;
            display: block;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .feature-image:hover {
            transform: scale(1.01);
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            margin-bottom: 2rem;
        }
        .interactive-section {
            background-color: var(--light-bg);
            border-radius: var(--border-radius);
            padding: 2rem;
            margin: 3rem 0;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--dark-bg);
        }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            border-color: var(--primary-color);
            outline: none;
            box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.2);
        }
        button {
            background: linear-gradient(to right, var(--primary-color), var(--accent-color));
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        button:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(74, 111, 165, 0.4);
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .rating i {
            color: #ddd;
            font-size: 1.8rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating i:hover,
        .rating i.active {
            color: var(--warning-color);
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 3rem 0;
        }
        .web-link {
            background: white;
            padding: 1.2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .web-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
        }
        .web-link a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            display: block;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
            transition: var(--transition);
        }
        .web-link a:hover {
            color: var(--accent-color);
            border-bottom-color: var(--accent-color);
        }
        footer {
            background-color: var(--dark-bg);
            color: white;
            padding: 3rem 0 1.5rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.95rem;
            color: #aaa;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            article { padding: 2rem; }
        }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
            .hamburger { display: block; }
            h1 { font-size: 2rem; padding-left: 1rem; }
            h2 { font-size: 1.6rem; }
            article { padding: 1.5rem; }
            .header-content { padding: 0 1rem; }
            .interactive-section { padding: 1.5rem; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 1.8rem; }
            .logo a { font-size: 1.8rem; }
            .web-links { grid-template-columns: 1fr; }
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in {
            animation: fadeInUp 0.6s ease-out;
        }
        .emoji {
            font-size: 1.2em;
            margin: 0 0.2rem;
        }
        .pro-tip, .warning-note, .step-box {
            padding: 1.5rem;
            border-radius: var(--border-radius);
            margin: 2rem 0;
        }
        .pro-tip {
            background-color: #e8f4fd;
            border-left: 5px solid #4a6fa5;
        }
        .warning-note {
            background-color: #fdeaea;
            border-left: 5px solid #e74c3c;
        }
        .step-box {
            background-color: #f0f7f0;
            border-left: 5px solid #27ae60;
            counter-increment: step-counter;
            position: relative;
            padding-left: 4rem;
        }
        .step-box::before {
            content: counter(step-counter);
            position: absolute;
            left: 1.5rem;
            top: 50%;
            transform: translateY(-50%);
            background-color: #27ae60;
            color: white;
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.2rem;
        }
        ol, ul {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.8rem;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
            box-shadow: var(--shadow);
            border-radius: var(--border-radius);
            overflow: hidden;
        }
        th, td {
            padding: 1rem;
            text-align: left;
            border-bottom: 1px solid #eee;
        }
        th {
            background-color: var(--primary-color);
            color: white;
            font-weight: 600;
        }
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        tr:hover {
            background-color: #f1f5fd;
        }