* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background: #f8f9fa;
        }

        /* Top Bar */
        .top-bar {
            background: #2d3748;
            color: white;
            padding: 8px 0;
            font-size: 14px;
        }

        .top-bar-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .contact-info {
            display: flex;
            gap: 20px;
        }

        .social-links {
            display: flex;
            gap: 10px;
        }

        .social-links a {
            color: white;
            text-decoration: none;
            padding: 5px;
        }

        /* Header */
        .header {
            background: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .header-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            min-height: 70px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            color: #2d3748;
        }

        .logo-icon {
            font-size: 2rem;
        }

        .logo-text {
            font-size: 1.5rem;
            font-weight: bold;
        }

        .main-nav {
            display: flex;
            list-style: none;
            gap: 30px;
        }

        .main-nav a {
            text-decoration: none;
            color: #4a5568;
            font-weight: 600;
            padding: 10px 15px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }

        .main-nav a:hover {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
        }

        /* Breadcrumbs */
        .breadcrumbs {
            background: #f1f5f9;
            padding: 15px 0;
            border-bottom: 1px solid #e2e8f0;
        }

        .breadcrumbs-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            text-align: center;
        }

        .breadcrumbs-list {
            display: inline-flex;
            list-style: none;
            gap: 10px;
            align-items: center;
        }

        .breadcrumbs-list li {
            color: #64748b;
            font-size: 14px;
        }

        .breadcrumbs-list a {
            color: #667eea;
            text-decoration: none;
        }

        /* Hero Section */
        .hero {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 60px 0;
            text-align: center;
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .hero-subtitle {
            font-size: 1.3rem;
            opacity: 0.95;
            max-width: 800px;
            margin: 0 auto 30px;
        }

        .article-meta {
            display: flex;
            justify-content: center;
            gap: 30px;
            flex-wrap: wrap;
            margin-top: 20px;
        }

        .meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* Container */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Main Content Layout */
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin: 40px 0;
        }

        .main-content {
            background: white;
            padding: 50px;
            border-radius: 15px;
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
        }

        /* Table of Contents */
        .toc {
            background: white;
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            position: sticky;
            top: 100px;
            max-height: calc(100vh - 120px);
            overflow-y: auto;
        }

        .toc h3 {
            color: #2d3748;
            margin-bottom: 20px;
            font-size: 1.3rem;
            border-bottom: 3px solid #667eea;
            padding-bottom: 10px;
        }

        .toc ul {
            list-style: none;
        }

        .toc li {
            margin-bottom: 12px;
        }

        .toc a {
            color: #4a5568;
            text-decoration: none;
            transition: color 0.3s;
            display: block;
            padding: 5px 10px;
            border-radius: 5px;
        }

        .toc a:hover {
            color: #667eea;
            background: #f8f9ff;
        }

        /* Article Content */
        .article-section {
            margin: 40px 0;
        }

        .article-section h2 {
            color: #2d3748;
            font-size: 2rem;
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 3px solid #667eea;
        }

        .article-section h3 {
            color: #4a5568;
            font-size: 1.5rem;
            margin: 30px 0 15px;
        }

        .article-section p {
            margin-bottom: 20px;
            color: #4a5568;
            font-size: 1.05rem;
            line-height: 1.8;
        }

        /* Formula Box */
        .formula-box {
            background: linear-gradient(135deg, #f0f8ff, #e6f3ff);
            border-left: 5px solid #667eea;
            padding: 30px;
            margin: 30px 0;
            border-radius: 10px;
        }

        .formula-box h4 {
            color: #2d3748;
            font-size: 1.3rem;
            margin-bottom: 15px;
        }

        .formula {
            background: white;
            padding: 20px;
            border-radius: 8px;
            font-size: 1.2rem;
            font-family: 'Courier New', monospace;
            text-align: center;
            margin: 15px 0;
            color: #2d3748;
            font-weight: bold;
        }

        .formula-explanation {
            color: #4a5568;
            font-size: 1rem;
            margin-top: 15px;
            line-height: 1.6;
        }

        /* Example Box */
        .example-box {
            background: #fff9e6;
            border-left: 5px solid #fbbf24;
            padding: 25px;
            margin: 25px 0;
            border-radius: 10px;
        }

        .example-box h4 {
            color: #92400e;
            margin-bottom: 15px;
            font-size: 1.2rem;
        }

        .example-box p {
            color: #78350f;
            margin-bottom: 12px;
        }

        /* Tip Box */
        .tip-box {
            background: #f0fdf4;
            border-left: 5px solid #10b981;
            padding: 20px;
            margin: 25px 0;
            border-radius: 10px;
        }

        .tip-box strong {
            color: #065f46;
            display: block;
            margin-bottom: 10px;
            font-size: 1.1rem;
        }

        .tip-box p {
            color: #047857;
            margin: 0;
        }

        /* Warning Box */
        .warning-box {
            background: #fef2f2;
            border-left: 5px solid #ef4444;
            padding: 20px;
            margin: 25px 0;
            border-radius: 10px;
        }

        .warning-box strong {
            color: #991b1b;
            display: block;
            margin-bottom: 10px;
            font-size: 1.1rem;
        }

        .warning-box p {
            color: #dc2626;
            margin: 0;
        }

        /* Comparison Table */
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 30px 0;
            background: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            border-radius: 10px;
            overflow: hidden;
        }

        .comparison-table thead {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
        }

        .comparison-table th {
            padding: 15px;
            text-align: left;
            font-weight: 600;
        }

        .comparison-table td {
            padding: 15px;
            border-bottom: 1px solid #e2e8f0;
        }

        .comparison-table tbody tr:hover {
            background: #f8f9ff;
        }

        /* Industry Benchmarks */
        .benchmark-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }

        .benchmark-card {
            background: white;
            padding: 25px;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            border-top: 4px solid #667eea;
        }

        .benchmark-card h4 {
            color: #2d3748;
            margin-bottom: 15px;
            font-size: 1.2rem;
        }

        .benchmark-value {
            font-size: 2rem;
            color: #667eea;
            font-weight: bold;
            margin: 10px 0;
        }

        .benchmark-label {
            color: #4a5568;
            font-size: 0.95rem;
        }

        /* Quick Reference Card */
        .quick-ref {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            padding: 40px;
            border-radius: 15px;
            margin: 40px 0;
        }

        .quick-ref h3 {
            font-size: 1.8rem;
            margin-bottom: 25px;
        }

        .quick-ref-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }

        .quick-ref-item {
            background: rgba(255,255,255,0.1);
            padding: 20px;
            border-radius: 10px;
        }

        .quick-ref-item strong {
            display: block;
            margin-bottom: 10px;
            font-size: 1.1rem;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            padding: 50px;
            text-align: center;
            margin: 40px 0;
            border-radius: 20px;
        }

        .cta-section h2 {
            font-size: 2.2rem;
            margin-bottom: 15px;
        }

        .cta-section p {
            font-size: 1.1rem;
            margin-bottom: 25px;
            opacity: 0.95;
        }

        .cta-button {
            background: white;
            color: #667eea;
            padding: 15px 40px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: bold;
            font-size: 1.1rem;
            display: inline-block;
            transition: all 0.3s ease;
        }

        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.3);
        }

        /* Footer */
        .footer {
            background: #2d3748;
            color: white;
            padding: 40px 0 20px;
            margin-top: 60px;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }

        .footer-section h3 {
            color: white;
            margin-bottom: 15px;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 8px;
        }

        .footer-links a {
            color: #a0aec0;
            text-decoration: none;
        }

        .footer-links a:hover {
            color: white;
        }

        .footer-bottom {
            border-top: 1px solid #4a5568;
            padding-top: 20px;
            text-align: center;
            color: #a0aec0;
        }

        /* Mobile Responsive */
        @media (max-width: 968px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }

            .toc {
                position: static;
                max-height: none;
            }

            .hero h1 {
                font-size: 2rem;
            }

            .main-content {
                padding: 30px 20px;
            }

            .main-nav {
                display: none;
            }

            .contact-info {
                display: none;
            }
        }