:root {
            --rc1gu-primary: #D43222;
            --rc1gu-primary-dark: #A8281B;
            --rc1gu-secondary: #1E293B;
            --rc1gu-accent: #F97316;
            --rc1gu-bg: #F8FAFC;
            --rc1gu-white: #FFFFFF;
            --rc1gu-text: #334155;
            --rc1gu-text-light: #64748B;
            --rc1gu-glass: rgba(255, 255, 255, 0.8);
            --rc1gu-container-width: 1100px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--rc1gu-bg);
            color: var(--rc1gu-text);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* Typography */
        h1, h2, h3 {
            color: var(--rc1gu-secondary);
            line-height: 1.2;
            word-break: keep-all;
            white-space: normal;
        }

        p {
            word-break: break-word;
            overflow-wrap: break-word;
            line-height: 1.8;
        }

        /* Layout Helpers */
        .rc1gu-container {
            max-width: var(--rc1gu-container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .rc1gu-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .rc1gu-flex-item {
            min-width: 0;
        }

        /* Navigation */
        .rc1gu-header {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: var(--rc1gu-glass);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .rc1gu-nav-container {
            height: 72px;
            justify-content: space-between;
            align-items: center;
        }

        .rc1gu-logo {
            flex: 0 0 auto;
        }

        .rc1gu-logo img {
            height: 32px;
            display: block;
        }

        .rc1gu-nav-menu {
            list-style: none;
            align-items: center;
            gap: 8px;
        }

        .rc1gu-nav-item a {
            text-decoration: none;
            color: var(--rc1gu-text);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.2s;
        }

        .rc1gu-nav-item a:hover {
            color: var(--rc1gu-primary);
            background: rgba(212, 50, 34, 0.05);
        }

        .rc1gu-nav-item.active a {
            color: var(--rc1gu-primary);
            font-weight: 700;
        }

        /* Hero Download Section */
        .rc1gu-hero {
            padding: 160px 0 96px;
            background: radial-gradient(circle at top right, rgba(212, 50, 34, 0.05), transparent);
            text-align: center;
        }

        .rc1gu-hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .rc1gu-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            margin-bottom: 24px;
            background: linear-gradient(135deg, var(--rc1gu-secondary) 0%, var(--rc1gu-primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .rc1gu-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.25rem);
            color: var(--rc1gu-text-light);
            margin-bottom: 48px;
        }

        .rc1gu-download-grid {
            gap: 24px;
            justify-content: center;
            margin-top: 32px;
        }

        .rc1gu-download-card {
            background: var(--rc1gu-white);
            border-radius: 20px;
            padding: 40px;
            flex: 0 0 320px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
            border: 1px solid rgba(0,0,0,0.03);
            text-align: left;
        }

        .rc1gu-download-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }

        .rc1gu-os-icon {
            font-size: 32px;
            margin-bottom: 16px;
        }

        .rc1gu-version-tag {
            display: inline-block;
            background: #E2E8F0;
            padding: 2px 10px;
            border-radius: 4px;
            font-size: 12px;
            margin-bottom: 12px;
        }

        .rc1gu-btn-download {
            display: inline-block;
            width: 100%;
            padding: 14px;
            background: var(--rc1gu-primary);
            color: white;
            text-decoration: none;
            border-radius: 12px;
            font-weight: 600;
            text-align: center;
            margin-top: 24px;
            transition: background 0.3s;
        }

        .rc1gu-btn-download:hover {
            background: var(--rc1gu-primary-dark);
        }

        /* Security Armor Section */
        .rc1gu-security {
            padding: 96px 0;
            background: var(--rc1gu-secondary);
            color: var(--rc1gu-white);
        }

        .rc1gu-section-header {
            margin-bottom: 64px;
            text-align: center;
        }

        .rc1gu-section-header h2 {
            color: var(--rc1gu-white);
            font-size: 32px;
            margin-bottom: 16px;
        }

        .rc1gu-security-grid {
            gap: 32px;
        }

        .rc1gu-security-item {
            flex: 1 1 300px;
            background: rgba(255,255,255,0.05);
            padding: 32px;
            border-radius: 16px;
            border-left: 4px solid var(--rc1gu-primary);
        }

        .rc1gu-security-item h3 {
            color: var(--rc1gu-white);
            margin-bottom: 12px;
            font-size: 20px;
        }

        .rc1gu-technical-detail {
            font-size: 14px;
            color: #94A3B8;
            margin-bottom: 12px;
            font-family: monospace;
        }

        .rc1gu-implementation {
            font-size: 15px;
            color: #CBD5E1;
        }

        /* Industry Solutions Flow */
        .rc1gu-industry {
            padding: 96px 0;
        }

        .rc1gu-flow-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .rc1gu-flow-card {
            background: var(--rc1gu-white);
            padding: 40px;
            border-radius: 24px;
            position: relative;
            overflow: hidden;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
        }

        .rc1gu-flow-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(to right, var(--rc1gu-primary), var(--rc1gu-accent));
        }

        .rc1gu-sector-label {
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--rc1gu-primary);
            margin-bottom: 16px;
            display: block;
        }

        .rc1gu-workflow {
            margin: 16px 0;
            padding-left: 16px;
            border-left: 2px solid #E2E8F0;
        }

        .rc1gu-advantage {
            background: #F1F5F9;
            padding: 16px;
            border-radius: 12px;
            font-size: 14px;
        }

        /* Footer */
        .rc1gu-footer {
            background: var(--rc1gu-white);
            padding: 64px 0 32px;
            border-top: 1px solid #E2E8F0;
        }

        .rc1gu-footer-content {
            justify-content: space-between;
            align-items: flex-start;
            margin-bottom: 48px;
        }

        .rc1gu-brand-info {
            flex: 0 0 300px;
        }

        .rc1gu-brand-text {
            font-size: 24px;
            font-weight: 800;
            color: var(--rc1gu-secondary);
            margin-bottom: 16px;
        }

        .rc1gu-copyright {
            text-align: center;
            color: var(--rc1gu-text-light);
            font-size: 14px;
            padding-top: 32px;
            border-top: 1px solid #F1F5F9;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .rc1gu-nav-menu {
                display: none; /* In a real site, implement a hamburger menu */
            }
            .rc1gu-download-card {
                flex: 1 1 100%;
            }
            .rc1gu-hero {
                padding: 120px 0 64px;
            }
            .rc1gu-flow-card {
                padding: 24px;
            }
        }

        /* Unique Visual Flourish: Floating Shapes */
        .rc1gu-shape {
            position: absolute;
            z-index: -1;
            opacity: 0.1;
        }
        .rc1gu-shape-1 {
            top: 10%; right: 5%;
            width: 200px; height: 200px;
            background: var(--rc1gu-primary);
            border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
        }