:root {
            --px5cu-primary: #bf0000;
            --px5cu-primary-hover: #e60000;
            --px5cu-dark: #1a1a1a;
            --px5cu-light: #f8f9fa;
            --px5cu-gray: #6c757d;
            --px5cu-accent: #0056b3;
            --px5cu-border-radius: 16px;
            --px5cu-spacing: 8px;
            --px5cu-container-width: 1300px;
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            line-height: 1.7;
            color: var(--px5cu-dark);
            background-color: #ffffff;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* Typography */
        h1, h2, h3 {
            line-height: 1.2;
            margin-bottom: calc(var(--px5cu-spacing) * 2);
            font-weight: 800;
            color: var(--px5cu-dark);
            word-break: break-word;
        }

        h1 { font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem); }
        h2 { font-size: clamp(1.8rem, 3vw + 1rem, 2.8rem); border-left: 6px solid var(--px5cu-primary); padding-left: 20px; }
        h3 { font-size: clamp(1.3rem, 2vw + 0.5rem, 1.8rem); }
        p { margin-bottom: calc(var(--px5cu-spacing) * 3); font-size: clamp(1rem, 1vw + 0.5rem, 1.15rem); color: #444; word-break: break-word; }

        /* Navigation */
        .px5cu-nav-wrapper {
            position: fixed;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            width: 95%;
            max-width: var(--px5cu-container-width);
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(15px);
            border-radius: 50px;
            padding: 10px 30px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }

        .px5cu-logo img {
            height: 40px;
            display: block;
        }

        .px5cu-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 15px;
        }

        .px5cu-menu a {
            text-decoration: none;
            color: var(--px5cu-dark);
            font-weight: 600;
            font-size: 0.95rem;
            transition: color 0.3s;
            padding: 5px 10px;
            border-radius: 8px;
        }

        .px5cu-menu a:hover {
            color: var(--px5cu-primary);
            background: rgba(191, 0, 0, 0.05);
        }

        .px5cu-menu a.px5cu-active {
            color: var(--px5cu-primary);
            border-bottom: 2px solid var(--px5cu-primary);
        }

        /* Layout Components */
        .px5cu-container {
            max-width: var(--px5cu-container-width);
            margin: 0 auto;
            padding: 0 40px;
            width: 100%;
        }

        /* Hero Section - Unique Diagonal Layout */
        .px5cu-hero {
            position: relative;
            padding: 200px 0 120px;
            background: linear-gradient(135deg, #fdfdfd 0%, #f4f4f4 100%);
            overflow: hidden;
        }

        .px5cu-hero::after {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 40%;
            height: 100%;
            background: var(--px5cu-primary);
            clip-path: polygon(20% 0, 100% 0, 100% 100%, 0% 100%);
            z-index: 1;
            opacity: 0.03;
        }

        .px5cu-hero-content {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            position: relative;
            z-index: 2;
        }

        .px5cu-hero-text {
            flex: 1;
            min-width: 350px;
        }

        .px5cu-hero-visual {
            flex: 1;
            min-width: 350px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        /* Custom CSS Drawing for Threading visualization */
        .px5cu-thread-visual {
            width: 100%;
            max-width: 500px;
            height: 300px;
            background: #fff;
            border-radius: var(--px5cu-border-radius);
            box-shadow: 0 30px 60px rgba(0,0,0,0.1);
            padding: 30px;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .px5cu-bar {
            height: 12px;
            background: #eee;
            border-radius: 10px;
            position: relative;
            overflow: hidden;
        }

        .px5cu-bar-fill {
            position: absolute;
            height: 100%;
            background: var(--px5cu-primary);
            width: 0;
            transition: width 2s ease-in-out;
        }

        /* Section: Dynamic Workflow */
        .px5cu-workflow {
            padding: 100px 0;
            background: #fff;
        }

        .px5cu-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 64px;
        }

        .px5cu-card {
            background: #ffffff;
            padding: 40px;
            border-radius: var(--px5cu-border-radius);
            border: 1px solid #eee;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            display: flex;
            flex-direction: column;
        }

        .px5cu-card:hover {
            transform: translateY(-15px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
            border-color: var(--px5cu-primary);
        }

        .px5cu-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(191, 0, 0, 0.1);
            color: var(--px5cu-primary);
            font-size: 0.8rem;
            font-weight: 700;
            border-radius: 4px;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .px5cu-boost {
            margin-top: auto;
            font-weight: 700;
            color: #28a745;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* Section: Settings Guide */
        .px5cu-settings-guide {
            padding: 100px 0;
            background: var(--px5cu-dark);
            color: #fff;
        }

        .px5cu-settings-guide h2 {
            color: #fff;
            border-color: var(--px5cu-primary);
        }

        .px5cu-step-item {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            margin-bottom: 80px;
            align-items: center;
        }

        .px5cu-step-item:nth-child(even) {
            flex-direction: row-reverse;
        }

        .px5cu-step-text {
            flex: 1;
            min-width: 300px;
        }

        .px5cu-step-ui {
            flex: 1;
            min-width: 300px;
            background: rgba(255,255,255,0.05);
            padding: 30px;
            border-radius: 20px;
            border: 1px dashed rgba(255,255,255,0.2);
        }

        .px5cu-ui-mockup {
            background: #252525;
            border-radius: 8px;
            padding: 20px;
            font-family: monospace;
            color: #00ff00;
            font-size: 0.9rem;
        }

        /* Buttons */
        .px5cu-btn {
            display: inline-block;
            padding: 16px 40px;
            background: var(--px5cu-primary);
            color: #fff;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 700;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
            box-shadow: 0 10px 20px rgba(191, 0, 0, 0.2);
        }

        .px5cu-btn:hover {
            background: var(--px5cu-primary-hover);
            transform: scale(1.05);
            box-shadow: 0 15px 30px rgba(191, 0, 0, 0.3);
        }

        /* Footer */
        .px5cu-footer {
            background: #f4f4f4;
            padding: 80px 0 40px;
            border-top: 1px solid #ddd;
        }

        .px5cu-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .px5cu-footer-brand h4 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: var(--px5cu-primary);
        }

        .px5cu-footer-links h5 {
            margin-bottom: 24px;
            font-size: 1.1rem;
        }

        .px5cu-footer-links ul {
            list-style: none;
        }

        .px5cu-footer-links li {
            margin-bottom: 12px;
        }

        .px5cu-footer-links a {
            text-decoration: none;
            color: var(--px5cu-gray);
            transition: color 0.3s;
        }

        .px5cu-footer-links a:hover {
            color: var(--px5cu-primary);
        }

        .px5cu-copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid #eee;
            color: var(--px5cu-gray);
            font-size: 0.9rem;
        }

        /* Mobile Adjustments */
        @media (max-width: 768px) {
            .px5cu-nav-wrapper {
                top: 0;
                width: 100%;
                border-radius: 0;
                padding: 10px 15px;
            }
            .px5cu-menu {
                display: none; /* In a real site, implement a burger menu */
            }
            .px5cu-hero {
                padding: 120px 0 60px;
                text-align: center;
            }
            .px5cu-hero-visual {
                margin-top: 40px;
            }
            .px5cu-step-item, .px5cu-step-item:nth-child(even) {
                flex-direction: column;
            }
        }