:root {
            --primary: #2563eb;
            --secondary: #1e40af;
            --accent: #f59e0b;
            --light: #f8fafc;
            --dark: #1e293b;
            --gray: #64748b;
            --success: #10b981;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            --radius: 8px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: var(--light);
            overflow-x: hidden;
        }
        .header {
            background: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .logo i {
            color: var(--accent);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-link {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            padding: 1rem 0;
            position: relative;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--primary);
            transition: var(--transition);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--dark);
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: white;
            padding: 1rem;
            box-shadow: var(--shadow);
        }
        .nav-mobile.active {
            display: flex;
        }
        .breadcrumb {
            background: #e2e8f0;
            padding: 0.75rem 1rem;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            max-width: 1200px;
            margin: 0 auto;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
        }
        .breadcrumb a {
            color: var(--gray);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb i {
            margin: 0 0.5rem;
            color: var(--gray);
            font-size: 0.8rem;
        }
        .container {
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 1rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
        }
        @media (max-width: 992px) {
            .container {
                grid-template-columns: 1fr;
            }
        }
        .main-content {
            background: white;
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow);
        }
        .sidebar {
            background: white;
            border-radius: var(--radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            align-self: start;
        }
        h1 {
            font-size: 2.5rem;
            color: var(--dark);
            margin-bottom: 1.5rem;
            line-height: 1.3;
        }
        h2 {
            font-size: 1.8rem;
            color: var(--secondary);
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent);
        }
        h3 {
            font-size: 1.4rem;
            color: var(--dark);
            margin: 1.8rem 0 0.8rem;
        }
        .article-meta {
            display: flex;
            gap: 1rem;
            color: var(--gray);
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .meta-item {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .content-img {
            width: 100%;
            height: auto;
            border-radius: var(--radius);
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .highlight-box {
            background: linear-gradient(135deg, #dbeafe, #eff6ff);
            border-left: 4px solid var(--primary);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .step-guide {
            counter-reset: step;
            margin: 2rem 0;
        }
        .step {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
            padding: 1.5rem;
            background: #f8fafc;
            border-radius: var(--radius);
            border: 1px solid #e2e8f0;
        }
        .step::before {
            counter-increment: step;
            content: counter(step);
            background: var(--primary);
            color: white;
            width: 2rem;
            height: 2rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            flex-shrink: 0;
        }
        .warning-box {
            background: #fef3c7;
            border: 1px solid #f59e0b;
            padding: 1.5rem;
            border-radius: var(--radius);
            margin: 2rem 0;
        }
        .search-form {
            margin-bottom: 2rem;
        }
        .search-box {
            display: flex;
            gap: 0.5rem;
        }
        .search-input {
            flex: 1;
            padding: 0.75rem 1rem;
            border: 2px solid #cbd5e1;
            border-radius: var(--radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-input:focus {
            outline: none;
            border-color: var(--primary);
        }
        .search-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: var(--radius);
            cursor: pointer;
            transition: var(--transition);
            font-weight: 600;
        }
        .search-btn:hover {
            background: var(--secondary);
        }
        .comment-section, .rating-section {
            margin: 3rem 0;
            padding-top: 2rem;
            border-top: 1px solid #e2e8f0;
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            color: #cbd5e1;
            font-size: 1.5rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover, .star.active {
            color: var(--accent);
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-input, .form-textarea {
            width: 100%;
            padding: 0.75rem;
            border: 2px solid #cbd5e1;
            border-radius: var(--radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-input:focus, .form-textarea:focus {
            outline: none;
            border-color: var(--primary);
        }
        .form-textarea {
            min-height: 120px;
            resize: vertical;
        }
        .submit-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0.75rem 2rem;
            border-radius: var(--radius);
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .submit-btn:hover {
            background: var(--secondary);
            transform: translateY(-2px);
        }
        .web-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
            margin: 3rem 0;
        }
        .web-link {
            background: white;
            padding: 1rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .web-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        .web-link a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .web-link a:hover {
            color: var(--secondary);
        }
        .footer {
            background: var(--dark);
            color: white;
            padding: 3rem 1rem;
            margin-top: 3rem;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 1.5rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.75rem;
        }
        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 0.5rem;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #475569;
            color: #94a3b8;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .nav-mobile {
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            .main-content {
                padding: 1.5rem;
            }
            .article-meta {
                flex-direction: column;
                gap: 0.5rem;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .main-content, .sidebar {
            animation: fadeIn 0.6s ease-out;
        }
        .text-primary { color: var(--primary); }
        .text-accent { color: var(--accent); }
        .font-bold { font-weight: 700; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .mt-2 { margin-top: 2rem; }
        .text-center { text-align: center; }
        .flex { display: flex; }
        .items-center { align-items: center; }
        .gap-2 { gap: 0.5rem; }