* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1a365d;
            --secondary: #d4af37;
            --accent: #c53030;
            --light: #f8f9fa;
            --dark: #2d3748;
            --gray: #718096;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --radius: 8px;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: #fff;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            color: var(--primary);
            margin-bottom: 1.2rem;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.8rem;
            border-bottom: 3px solid var(--secondary);
            padding-bottom: 0.5rem;
            margin-top: 1.5rem;
        }
        h2 {
            font-size: 2.2rem;
            margin-top: 3rem;
            padding-left: 1rem;
            border-left: 5px solid var(--accent);
        }
        h3 {
            font-size: 1.8rem;
            margin-top: 2.5rem;
            color: var(--dark);
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--primary) 0%, #2a4365 100%);
            color: white;
            padding: 1.2rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: 1px;
            color: var(--secondary);
        }
        .logo a {
            color: inherit;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            font-size: 2.5rem;
        }
        .desktop-nav {
            display: flex;
            gap: 2rem;
        }
        .desktop-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
        }
        .desktop-nav a:hover {
            background: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
        }
        .mobile-toggle {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            flex-direction: column;
            background: var(--primary);
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: var(--shadow);
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav a {
            color: white;
            padding: 1rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background: var(--light);
            padding: 1rem 0;
            margin-bottom: 2rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            gap: 0.8rem;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 0.8rem;
            color: var(--gray);
        }
        .search-container {
            background: linear-gradient(to right, #f0f4f8, #e6fffa);
            padding: 2.5rem;
            border-radius: var(--radius);
            margin: 2.5rem 0;
            text-align: center;
            box-shadow: var(--shadow);
        }
        .search-form {
            max-width: 700px;
            margin: 0 auto;
            display: flex;
            gap: 10px;
        }
        .search-input {
            flex: 1;
            padding: 1.2rem 1.5rem;
            border: 2px solid #cbd5e0;
            border-radius: 50px;
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .search-input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.2);
        }
        .search-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0 2.5rem;
            border-radius: 50px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .search-btn:hover {
            background: #2a4365;
            transform: scale(1.05);
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 3rem;
            margin: 3rem 0;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .diagram-container {
            background: #f7fafc;
            border: 2px dashed #cbd5e0;
            border-radius: var(--radius);
            padding: 2rem;
            margin: 2.5rem 0;
            text-align: center;
        }
        .diagram-img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
            margin: 1.5rem 0;
            transition: var(--transition);
        }
        .diagram-img:hover {
            transform: scale(1.02);
        }
        .img-caption {
            font-style: italic;
            color: var(--gray);
            margin-top: 1rem;
            font-size: 1rem;
        }
        .highlight {
            background: linear-gradient(120deg, rgba(212, 175, 55, 0.15) 0%, rgba(212, 175, 55, 0.05) 100%);
            border-left: 4px solid var(--secondary);
            padding: 1.8rem;
            margin: 2rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .pro-tip {
            background: #e6fffa;
            border: 2px solid #81e6d9;
            padding: 1.8rem;
            border-radius: var(--radius);
            margin: 2rem 0;
            position: relative;
            padding-left: 4rem;
        }
        .pro-tip::before {
            content: "💡";
            position: absolute;
            left: 1.5rem;
            top: 1.5rem;
            font-size: 1.8rem;
        }
        .interactive-setup {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .setup-step {
            background: white;
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
            border-top: 4px solid transparent;
        }
        .setup-step:hover {
            transform: translateY(-10px);
            border-top-color: var(--secondary);
        }
        .step-number {
            display: inline-block;
            background: var(--primary);
            color: white;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            font-weight: bold;
            margin-bottom: 1.5rem;
        }
        .sidebar {
            background: white;
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            height: fit-content;
            position: sticky;
            top: 120px;
        }
        .sidebar-section {
            margin-bottom: 2.5rem;
        }
        .sidebar h3 {
            font-size: 1.5rem;
            padding-bottom: 0.8rem;
            border-bottom: 2px solid var(--secondary);
            margin-bottom: 1.5rem;
        }
        .sidebar ul {
            list-style: none;
        }
        .sidebar li {
            margin-bottom: 1rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .sidebar li::before {
            content: "▸";
            color: var(--secondary);
            position: absolute;
            left: 0;
        }
        .rating-module {
            background: #f0fff4;
            padding: 2rem;
            border-radius: var(--radius);
            margin: 3rem 0;
            text-align: center;
            border: 1px solid #c6f6d5;
        }
        .stars {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
            margin: 1.5rem 0;
            font-size: 2.2rem;
            color: #e2e8f0;
        }
        .star {
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: #f6e05e;
            transform: scale(1.2);
        }
        .comment-form {
            background: white;
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 3rem 0;
        }
        .form-group {
            margin-bottom: 1.8rem;
        }
        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--dark);
        }
        .form-input,
        .form-textarea {
            width: 100%;
            padding: 1rem;
            border: 2px solid #e2e8f0;
            border-radius: var(--radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-input:focus,
        .form-textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.2);
        }
        .form-textarea {
            min-height: 180px;
            resize: vertical;
        }
        .submit-btn {
            background: linear-gradient(to right, var(--primary), #2a4365);
            color: white;
            border: none;
            padding: 1.2rem 3rem;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .submit-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 15px rgba(26, 54, 93, 0.3);
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            margin: 4rem 0 2rem;
            padding: 2.5rem;
            background: linear-gradient(to bottom, #f8f9fa, #e9ecef);
            border-radius: var(--radius);
        }
        .web-link {
            background: white;
            padding: 1.5rem;
            border-radius: var(--radius);
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
            border-left: 4px solid transparent;
        }
        .web-link:hover {
            transform: translateX(10px);
            border-left-color: var(--secondary);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        footer {
            background: var(--primary);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 3rem;
        }
        .footer-section h4 {
            color: var(--secondary);
            font-size: 1.4rem;
            margin-bottom: 1.8rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid rgba(212, 175, 55, 0.3);
        }
        .footer-links {
            list-style: none;
        }
        .footer-links a {
            color: #cbd5e0;
            display: block;
            padding: 0.5rem 0;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 10px;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #a0aec0;
            font-size: 0.95rem;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .desktop-nav {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .search-form {
                flex-direction: column;
            }
            .search-btn {
                padding: 1rem;
                justify-content: center;
            }
            .article-content,
            .sidebar {
                padding: 1.5rem;
            }
            .interactive-setup {
                grid-template-columns: 1fr;
            }
            .web-links {
                grid-template-columns: 1fr;
                padding: 1.5rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }
            .logo {
                font-size: 1.8rem;
            }
            .pro-tip {
                padding-left: 3rem;
            }
            .stars {
                font-size: 1.8rem;
            }
        }
        @media print {
            .mobile-toggle,
            .search-container,
            .sidebar,
            .rating-module,
            .comment-form,
            .web-links,
            footer {
                display: none;
            }
            .container {
                max-width: 100%;
            }
            .article-content {
                box-shadow: none;
                padding: 0;
            }
        }