:root{--zt-page-bg: #0a0a0f;--zt-surface: #0d0d14;--zt-surface-alt: #13131e;--zt-border: rgba(255, 255, 255, .12);--zt-text: #e0e0e0;--zt-text-muted: #aaa;--zt-text-soft: #888}html.theme-light{--zt-page-bg: #f3f6fb;--zt-surface: #ffffff;--zt-surface-alt: #f7f9fc;--zt-border: rgba(15, 23, 42, .14);--zt-text: #1e293b;--zt-text-muted: #475569;--zt-text-soft: #64748b}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--zt-page-bg);color:var(--zt-text);font-family:Segoe UI,-apple-system,BlinkMacSystemFont,Roboto,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}html.theme-light .brochure,html.theme-light .concept-page,html.theme-light .implementation,html.theme-light .app-shell{background:var(--zt-page-bg);color:var(--zt-text)}html.theme-light .site-nav,html.theme-light .app-header,html.theme-light .app-footer,html.theme-light .concept-nav,html.theme-light .concept-subnav,html.theme-light .impl-header,html.theme-light .nav-group-menu{background:var(--zt-surface);border-color:var(--zt-border)}html.theme-light .nav-link,html.theme-light .nav-group-btn,html.theme-light .nav-group-item,html.theme-light .hero-subtitle,html.theme-light .hero-tagline,html.theme-light .section-subtitle,html.theme-light .footer-item,html.theme-light .footer-copyright{color:var(--zt-text-muted)}html.theme-light .nav-link:hover,html.theme-light .nav-link.active,html.theme-light .nav-group-btn:hover,html.theme-light .nav-group.open .nav-group-btn,html.theme-light .nav-group-item:hover{background:#0f172a14;color:var(--zt-text)}html.theme-light .panel,html.theme-light .feature-card,html.theme-light .detail,html.theme-light .pillar,html.theme-light .capability,html.theme-light .prereq-card,html.theme-light .phase-content,html.theme-light .component-card,html.theme-light .feature,html.theme-light .journey-stage{background:var(--zt-surface-alt);border-color:var(--zt-border)}html.theme-light .panel-title{color:var(--zt-text-soft)}a{color:#00c8ff;text-decoration:none}button{font-family:inherit}