:root {
            --zpa57-primary: #f39c12;
            --zpa57-secondary: #2980b9;
            --zpa57-dark: #0f172a;
            --zpa57-dark-lighter: #1e293b;
            --zpa57-text: #f8fafc;
            --zpa57-text-muted: #94a3b8;
            --zpa57-bg: #020617;
            --zpa57-accent: #38bdf8;
            --zpa57-white: #ffffff;
            --zpa57-container-width: 1320px;
            --zpa57-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--zpa57-bg);
            color: var(--zpa57-text);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* Layout Helpers */
        .zpa57-container {
            max-width: var(--zpa57-container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .zpa57-flex {
            display: flex;
            flex-wrap: wrap;
        }

        .zpa57-flex-item {
            min-width: 0;
        }

        .zpa57-section {
            padding: 96px 0;
            position: relative;
        }

        /* Navigation */
        .zpa57-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(2, 6, 23, 0.8);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            transition: var(--zpa57-transition);
        }

        .zpa57-nav-wrapper {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
            flex-wrap: wrap;
        }

        .zpa57-logo {
            flex: 0 0 auto;
            display: flex;
            align-items: center;
        }

        .zpa57-logo img {
            height: 40px;
            width: auto;
        }

        .zpa57-nav {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }

        .zpa57-nav-item {
            margin-left: 16px;
        }

        .zpa57-nav-link {
            text-decoration: none;
            color: var(--zpa57-text-muted);
            font-size: 15px;
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 6px;
            transition: var(--zpa57-transition);
        }

        .zpa57-nav-link:hover, .zpa57-nav-link.zpa57-active {
            color: var(--zpa57-white);
            background: rgba(243, 156, 18, 0.15);
        }

        .zpa57-nav-link.zpa57-active {
            color: var(--zpa57-primary);
        }

        /* Hero Download Section - Unique Split Layout */
        .zpa57-hero {
            padding-top: 160px;
            background: radial-gradient(circle at 10% 20%, rgba(243, 156, 18, 0.05) 0%, transparent 50%),
                        radial-gradient(circle at 90% 80%, rgba(56, 189, 248, 0.05) 0%, transparent 50%);
        }

        .zpa57-hero-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 64px;
            align-items: center;
        }

        .zpa57-hero-content h1 {
            font-size: clamp(2.5rem, 5vw, 4rem);
            line-height: 1.1;
            margin-bottom: 24px;
            font-weight: 800;
            background: linear-gradient(to right, #fff, var(--zpa57-primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .zpa57-hero-subtitle {
            font-size: clamp(1.1rem, 2vw, 1.4rem);
            color: var(--zpa57-text-muted);
            margin-bottom: 40px;
            max-width: 600px;
        }

        /* Download Card Interface */
        .zpa57-download-card {
            background: var(--zpa57-dark-lighter);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 24px;
            padding: 48px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
            position: relative;
            overflow: hidden;
        }

        .zpa57-download-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: var(--zpa57-primary);
        }

        .zpa57-badge {
            display: inline-block;
            padding: 6px 12px;
            background: rgba(243, 156, 18, 0.2);
            color: var(--zpa57-primary);
            border-radius: 99px;
            font-size: 12px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 16px;
        }

        .zpa57-download-title {
            font-size: 28px;
            margin-bottom: 8px;
        }

        .zpa57-download-info {
            color: var(--zpa57-text-muted);
            font-size: 14px;
            margin-bottom: 32px;
        }

        .zpa57-btn-group {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .zpa57-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 32px;
            border-radius: 12px;
            font-weight: 600;
            text-decoration: none;
            transition: var(--zpa57-transition);
            cursor: pointer;
            border: none;
        }

        .zpa57-btn-primary {
            background: var(--zpa57-primary);
            color: var(--zpa57-white);
            box-shadow: 0 10px 15px -3px rgba(243, 156, 18, 0.3);
        }

        .zpa57-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 20px 25px -5px rgba(243, 156, 18, 0.4);
        }

        .zpa57-btn-outline {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: var(--zpa57-white);
        }

        .zpa57-btn-outline:hover {
            background: rgba(255, 255, 255, 0.05);
            border-color: var(--zpa57-white);
        }

        /* Protocol Matrix Board */
        .zpa57-matrix-section {
            background: #020617;
        }

        .zpa57-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
            gap: 32px;
        }

        .zpa57-matrix-item {
            background: rgba(30, 41, 59, 0.4);
            border: 1px solid rgba(255, 255, 255, 0.05);
            padding: 32px;
            border-radius: 16px;
            transition: var(--zpa57-transition);
        }

        .zpa57-matrix-item:hover {
            background: rgba(30, 41, 59, 0.6);
            border-color: var(--zpa57-primary);
            transform: scale(1.02);
        }

        .zpa57-matrix-category {
            color: var(--zpa57-primary);
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 12px;
            display: block;
        }

        .zpa57-matrix-title {
            font-size: 24px;
            margin-bottom: 16px;
        }

        .zpa57-tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 20px;
        }

        .zpa57-tag {
            background: rgba(56, 189, 248, 0.1);
            color: var(--zpa57-accent);
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 13px;
            font-family: monospace;
        }

        .zpa57-matrix-desc {
            font-size: 15px;
            color: var(--zpa57-text-muted);
        }

        /* Features - Image/Text Alternating */
        .zpa57-feature-row {
            display: flex;
            align-items: center;
            gap: 64px;
            margin-bottom: 96px;
            flex-wrap: wrap;
        }

        .zpa57-feature-row:nth-child(even) {
            flex-direction: row-reverse;
        }

        .zpa57-feature-content {
            flex: 1 1 450px;
            min-width: 0;
        }

        .zpa57-feature-visual {
            flex: 1 1 450px;
            min-width: 0;
            background: linear-gradient(135deg, var(--zpa57-dark-lighter), var(--zpa57-bg));
            height: 350px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(255, 255, 255, 0.1);
            box-shadow: inset 0 0 40px rgba(0,0,0,0.5);
            position: relative;
        }

        .zpa57-feature-visual::after {
            content: "PREVIEW";
            color: rgba(255,255,255,0.05);
            font-size: 60px;
            font-weight: 900;
        }

        /* SEO Dynamic Content */
        .zpa57-dynamic-news {
            background: var(--zpa57-dark);
        }

        .zpa57-news-card {
            background: var(--zpa57-bg);
            padding: 24px;
            border-radius: 12px;
            margin-bottom: 16px;
            border-left: 4px solid var(--zpa57-accent);
        }

        /* Footer */
        .zpa57-footer {
            background: #020617;
            padding: 64px 0 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .zpa57-footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 48px;
        }

        .zpa57-footer-brand h2 {
            font-size: 24px;
            color: var(--zpa57-white);
            margin-bottom: 16px;
        }

        .zpa57-footer-text {
            color: var(--zpa57-text-muted);
            font-size: 14px;
        }

        .zpa57-footer-links h4 {
            margin-bottom: 24px;
            font-size: 16px;
            color: var(--zpa57-white);
        }

        .zpa57-footer-links ul {
            list-style: none;
        }

        .zpa57-footer-links li {
            margin-bottom: 12px;
        }

        .zpa57-footer-links a {
            color: var(--zpa57-text-muted);
            text-decoration: none;
            font-size: 14px;
            transition: var(--zpa57-transition);
        }

        .zpa57-footer-links a:hover {
            color: var(--zpa57-primary);
        }

        .zpa57-copyright {
            text-align: center;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            color: var(--zpa57-text-muted);
            font-size: 13px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .zpa57-nav-wrapper {
                height: auto;
                padding: 16px 0;
                flex-direction: column;
                gap: 16px;
            }
            .zpa57-nav {
                justify-content: center;
            }
            .zpa57-nav-item {
                margin: 4px;
            }
            .zpa57-hero {
                padding-top: 220px;
                text-align: center;
            }
            .zpa57-btn-group {
                justify-content: center;
            }
            .zpa57-section {
                padding: 64px 0;
            }
        }