:root {
            --rfq3-primary: #f37021;
            --rfq3-primary-dark: #d45d1a;
            --rfq3-secondary: #004b87;
            --rfq3-bg-dark: #0a111a;
            --rfq3-bg-light: #f4f7f9;
            --rfq3-text-main: #2d3748;
            --rfq3-text-muted: #718096;
            --rfq3-white: #ffffff;
            --rfq3-max-width: 1400px;
            --rfq3-transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
        }

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

        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            color: var(--rfq3-text-main);
            background-color: var(--rfq3-bg-light);
            line-height: 1.7;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* --- Navigation --- */
        .rfq3-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(15px);
            box-shadow: 0 2px 20px rgba(0,0,0,0.05);
            padding: 12px 0;
        }

        .rfq3-nav-container {
            max-width: var(--rfq3-max-width);
            margin: 0 auto;
            padding: 0 48px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

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

        .rfq3-logo img {
            height: 42px;
            width: auto;
            display: block;
        }

        .rfq3-nav-list {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .rfq3-nav-item a {
            text-decoration: none;
            color: var(--rfq3-text-main);
            font-size: 14px;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 6px;
            transition: var(--rfq3-transition);
            display: block;
            word-break: break-word;
        }

        .rfq3-nav-item a:hover {
            color: var(--rfq3-primary);
            background: rgba(243, 112, 33, 0.05);
        }

        .rfq3-nav-item.active a {
            color: var(--rfq3-white);
            background: var(--rfq3-primary);
        }

        /* --- Hero Section --- */
        .rfq3-hero {
            position: relative;
            min-height: 90vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 120px 48px 80px;
            background: var(--rfq3-bg-dark);
            color: var(--rfq3-white);
            overflow: hidden;
        }

        .rfq3-hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.35;
            filter: grayscale(40%) contrast(1.1);
        }

        .rfq3-hero-content {
            position: relative;
            z-index: 10;
            max-width: 900px;
            text-align: center;
        }

        .rfq3-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            text-shadow: 0 10px 30px rgba(0,0,0,0.5);
        }

        .rfq3-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.6rem);
            color: rgba(255,255,255,0.85);
            margin-bottom: 48px;
            max-width: 750px;
            margin-left: auto;
            margin-right: auto;
        }

        .rfq3-cta-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 24px;
            min-width: 0;
        }

        .rfq3-btn {
            display: inline-block;
            padding: 18px 42px;
            border-radius: 50px;
            font-weight: 700;
            text-decoration: none;
            transition: var(--rfq3-transition);
            cursor: pointer;
            border: none;
            text-align: center;
        }

        .rfq3-btn-primary {
            background: linear-gradient(135deg, var(--rfq3-primary), #ff8c42);
            color: white;
            box-shadow: 0 10px 25px rgba(243, 112, 33, 0.4);
        }

        .rfq3-btn-primary:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(243, 112, 33, 0.6);
        }

        .rfq3-btn-outline {
            background: transparent;
            border: 2px solid rgba(255,255,255,0.3);
            color: white;
        }

        .rfq3-btn-outline:hover {
            background: rgba(255,255,255,0.1);
            border-color: white;
        }

        /* --- Engine Specifications Section --- */
        .rfq3-specs {
            padding: 96px 48px;
            background: var(--rfq3-white);
        }

        .rfq3-section-head {
            text-align: center;
            margin-bottom: 72px;
        }

        .rfq3-section-head h2 {
            font-size: clamp(2rem, 3vw + 0.5rem, 2.8rem);
            color: var(--rfq3-secondary);
            margin-bottom: 16px;
        }

        .rfq3-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            max-width: var(--rfq3-max-width);
            margin: 0 auto;
        }

        .rfq3-spec-card {
            background: var(--rfq3-bg-light);
            padding: 48px;
            border-radius: 24px;
            border: 1px solid rgba(0,0,0,0.05);
            transition: var(--rfq3-transition);
            min-width: 0;
            word-break: break-word;
        }

        .rfq3-spec-card:hover {
            transform: translateY(-10px);
            background: var(--rfq3-white);
            box-shadow: 0 30px 60px rgba(0,0,0,0.08);
        }

        .rfq3-spec-icon {
            font-size: 40px;
            margin-bottom: 24px;
            display: block;
            color: var(--rfq3-primary);
        }

        .rfq3-spec-title {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--rfq3-bg-dark);
        }

        .rfq3-spec-text {
            font-size: 16px;
            color: var(--rfq3-text-muted);
            margin-bottom: 20px;
        }

        .rfq3-spec-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(0,75,135,0.1);
            color: var(--rfq3-secondary);
            border-radius: 4px;
            font-size: 13px;
            font-weight: 600;
            margin-top: 10px;
        }

        /* --- Showcase Section --- */
        .rfq3-showcase {
            padding: 96px 48px;
            background: linear-gradient(to bottom, #f4f7f9, #ffffff);
            overflow: hidden;
        }

        .rfq3-flex-row {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            max-width: var(--rfq3-max-width);
            margin: 0 auto;
        }

        .rfq3-flex-col {
            flex: 1;
            min-width: 350px;
        }

        .rfq3-image-frame {
            position: relative;
            border-radius: 32px;
            box-shadow: 0 50px 100px rgba(0,0,0,0.15);
            overflow: hidden;
        }

        .rfq3-image-frame img {
            width: 100%;
            height: auto;
            display: block;
            transition: var(--rfq3-transition);
        }

        .rfq3-image-frame:hover img {
            transform: scale(1.05);
        }

        /* --- Workflow Section --- */
        .rfq3-workflow {
            padding: 96px 48px;
            background: var(--rfq3-bg-dark);
            color: var(--rfq3-white);
        }

        .rfq3-workflow .rfq3-flex-row {
            flex-direction: row-reverse;
        }

        /* --- Security Section --- */
        .rfq3-security {
            padding: 96px 48px;
            background: var(--rfq3-white);
        }

        /* --- News Section --- */
        .rfq3-news {
            padding: 80px 48px;
            background: var(--rfq3-bg-light);
            text-align: center;
        }

        /* --- Footer --- */
        .rfq3-footer {
            background: #050a10;
            color: rgba(255,255,255,0.6);
            padding: 80px 48px 40px;
        }

        .rfq3-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            max-width: var(--rfq3-max-width);
            margin: 0 auto;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            padding-bottom: 48px;
        }

        .rfq3-footer-brand h3 {
            color: var(--rfq3-white);
            font-size: 28px;
            margin-bottom: 16px;
        }

        .rfq3-footer-links h4 {
            color: var(--rfq3-white);
            margin-bottom: 24px;
            font-size: 18px;
        }

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

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

        .rfq3-footer-links a {
            color: rgba(255,255,255,0.5);
            text-decoration: none;
            transition: var(--rfq3-transition);
        }

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

        .rfq3-copyright {
            text-align: center;
            padding-top: 40px;
            font-size: 14px;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .rfq3-nav-container { padding: 0 24px; }
            .rfq3-flex-row { gap: 40px; }
        }

        @media (max-width: 768px) {
            .rfq3-flex-col { min-width: 100%; }
            .rfq3-nav-list { display: none; } /* Simplified for mobile demo */
            .rfq3-hero { padding: 100px 24px 60px; }
            .rfq3-specs, .rfq3-showcase, .rfq3-workflow, .rfq3-security { padding: 64px 24px; }
            .rfq3-spec-card { padding: 32px; }
        }