:root {
            --rfq3-primary: #ff6600;
            --rfq3-primary-dark: #e65c00;
            --rfq3-secondary: #2c3e50;
            --rfq3-bg: #ffffff;
            --rfq3-text: #333333;
            --rfq3-light-gray: #f8f9fa;
            --rfq3-border: #e9ecef;
            --rfq3-accent-blue: #0078d4;
            --rfq3-spacing: 8px;
            --rfq3-max-width: 1400px;
        }

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

        body {
            font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
            color: var(--rfq3-text);
            line-height: 1.6;
            overflow-x: hidden;
            background-color: var(--rfq3-bg);
        }

        /* Layout Utilities */
        .rfq3-container {
            max-width: var(--rfq3-max-width);
            margin: 0 auto;
            padding: 0 calc(var(--rfq3-spacing) * 3);
        }

        .rfq3-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .rfq3-grid {
            display: grid;
            gap: calc(var(--rfq3-spacing) * 4);
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.2;
            word-break: keep-all;
            overflow-wrap: break-word;
            color: var(--rfq3-secondary);
        }

        p {
            line-height: 1.8;
            word-break: break-word;
            overflow-wrap: break-word;
            font-size: clamp(1rem, 0.5vw + 0.8rem, 1.125rem);
            margin-bottom: calc(var(--rfq3-spacing) * 2);
        }

        /* Navigation */
        .rfq3-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--rfq3-border);
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }

        .rfq3-nav-container {
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .rfq3-logo {
            flex-shrink: 0;
            min-width: 0;
        }

        .rfq3-logo img {
            height: 45px;
            width: auto;
            display: block;
        }

        .rfq3-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: calc(var(--rfq3-spacing) * 2);
        }

        .rfq3-menu-link {
            text-decoration: none;
            color: var(--rfq3-secondary);
            font-weight: 500;
            font-size: 0.9rem;
            padding: calc(var(--rfq3-spacing)) calc(var(--rfq3-spacing) * 1.5);
            border-radius: 4px;
            transition: all 0.3s ease;
        }

        .rfq3-menu-link:hover {
            color: var(--rfq3-primary);
            background: rgba(255, 102, 0, 0.05);
        }

        .rfq3-menu-link.active {
            color: var(--rfq3-primary);
            font-weight: 700;
            position: relative;
        }

        .rfq3-menu-link.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 15%;
            width: 70%;
            height: 3px;
            background: var(--rfq3-primary);
            border-radius: 2px;
        }

        /* Hero Section - Split Diagonal Design */
        .rfq3-hero {
            padding-top: 160px;
            padding-bottom: 100px;
            background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
            position: relative;
            overflow: hidden;
        }

        .rfq3-hero::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 50%;
            height: 100%;
            background: var(--rfq3-secondary);
            clip-path: polygon(20% 0, 100% 0, 100% 100%, 0% 100%);
            opacity: 0.03;
        }

        .rfq3-hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }

        .rfq3-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            font-weight: 900;
            margin-bottom: calc(var(--rfq3-spacing) * 3);
            background: linear-gradient(to right, var(--rfq3-secondary), var(--rfq3-primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .rfq3-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.5rem);
            color: #666;
            margin-bottom: calc(var(--rfq3-spacing) * 5);
        }

        /* Filter Engine Specifications */
        .rfq3-specs-section {
            padding: 96px 0;
            background: var(--rfq3-bg);
        }

        .rfq3-section-tag {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(255, 102, 0, 0.1);
            color: var(--rfq3-primary);
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.85rem;
            margin-bottom: calc(var(--rfq3-spacing) * 2);
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .rfq3-spec-grid {
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
        }

        .rfq3-spec-card {
            background: white;
            padding: calc(var(--rfq3-spacing) * 5);
            border: 1px solid var(--rfq3-border);
            border-radius: 16px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
        }

        .rfq3-spec-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
            border-color: var(--rfq3-primary);
        }

        .rfq3-spec-icon {
            width: 60px;
            height: 60px;
            background: var(--rfq3-light-gray);
            border-radius: 12px;
            margin-bottom: calc(var(--rfq3-spacing) * 3);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--rfq3-primary);
            border: 1px solid var(--rfq3-border);
        }

        .rfq3-spec-title {
            font-size: 1.5rem;
            margin-bottom: calc(var(--rfq3-spacing) * 2);
        }

        /* Filter Rules Section - Creative Data Layout */
        .rfq3-filter-logic {
            padding: 96px 0;
            background: var(--rfq3-secondary);
            color: white;
            border-radius: 40px;
            margin: 48px;
        }

        .rfq3-logic-inner {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .rfq3-logic-text {
            flex: 1;
            min-width: 300px;
        }

        .rfq3-logic-text h2 {
            color: white;
            font-size: 3rem;
            margin-bottom: 32px;
        }

        .rfq3-logic-visual {
            flex: 1;
            min-width: 300px;
            background: rgba(255,255,255,0.05);
            padding: 40px;
            border-radius: 24px;
            font-family: 'Courier New', Courier, monospace;
            border: 1px solid rgba(255,255,255,0.1);
        }

        .rfq3-code-line {
            display: block;
            padding: 4px 0;
            border-bottom: 1px solid rgba(255,255,255,0.05);
        }

        .rfq3-code-line span {
            color: var(--rfq3-primary);
        }

        /* Dynamic Articles Section */
        .rfq3-dynamic-section {
            padding: 96px 0;
        }

        .rfq3-article-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
            gap: 32px;
            margin-top: 48px;
        }

        .rfq3-article-item {
            display: flex;
            gap: 24px;
            padding: 24px;
            background: var(--rfq3-light-gray);
            border-radius: 12px;
            border-left: 4px solid var(--rfq3-primary);
        }

        /* Footer */
        .rfq3-footer {
            background: #1a1a1a;
            color: #999;
            padding: 80px 0 40px;
            margin-top: 96px;
        }

        .rfq3-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .rfq3-footer-brand h4 {
            color: white;
            font-size: 1.8rem;
            margin-bottom: 16px;
        }

        .rfq3-footer-links h5 {
            color: white;
            margin-bottom: 24px;
            font-size: 1.1rem;
        }

        .rfq3-footer-links ul {
            list-style: none;
        }

        .rfq3-footer-links li {
            margin-bottom: 12px;
        }

        .rfq3-footer-links a {
            color: #999;
            text-decoration: none;
            transition: color 0.3s;
        }

        .rfq3-footer-links a:hover {
            color: var(--rfq3-primary);
        }

        .rfq3-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid #333;
            font-size: 0.9rem;
        }

        /* Responsive Breakpoints */
        @media (max-width: 1024px) {
            .rfq3-menu {
                display: none; /* Hide on mobile for simplicity, or use a burger menu */
            }
            .rfq3-hero-title {
                font-size: 3rem;
            }
            .rfq3-filter-logic {
                margin: 16px;
                padding: 48px 24px;
            }
        }

        @media (max-width: 768px) {
            .rfq3-grid {
                grid-template-columns: 1fr;
            }
            .rfq3-article-list {
                grid-template-columns: 1fr;
            }
            .rfq3-nav-container {
                height: 60px;
            }
            .rfq3-logo img {
                height: 35px;
            }
        }