.fg-course{color:var(--ink);overflow-wrap:anywhere}.qcs-theme main.fg-course .page-hero.fg-hero{background:#eef4fa;display:block}.fg-hero-copy{max-width:1000px}.fg-back{color:var(--accent);margin-bottom:22px;font-size:14px;font-weight:550;display:inline-block}.fg-intro{max-width:64ch;color:var(--ink-body);margin:0;font-size:19px;line-height:1.7}.fg-facts{color:var(--brand-blue);flex-wrap:wrap;gap:12px 28px;margin-top:26px;font-size:14px;display:flex}.fg-facts span{border-left:2px solid var(--accent);padding-left:12px}.fg-status{color:var(--muted);margin:18px 0 0;font-size:13px}.fg-shell{width:min(1060px,100% - 48px);margin:0 auto}.fg-navigation{border-bottom:1px solid var(--line);flex-wrap:wrap;gap:8px;margin-bottom:30px;padding:24px 0;display:flex}.fg-navigation a{border:1px solid var(--line);color:var(--ink-body);background:#fff;border-radius:6px;padding:9px 13px;font-size:14px;text-decoration:none}.fg-navigation a[aria-current=page]{color:#fff;background:var(--accent);border-color:var(--accent)}.fg-navigation a:hover{border-color:var(--accent)}.fg-no-script{background:var(--panel-soft);border-left:3px solid var(--brand-blue);color:var(--ink-body);padding:18px}.fg-content{font-size:17px;line-height:1.8}.fg-content a{color:var(--accent-dark);text-underline-offset:3px;text-decoration:underline}.fg-content p{margin:16px 0}.fg-content :is(h2,h3,h4){color:var(--ink);line-height:1.3}.fg-content h2{margin:8px 0 20px;font-size:clamp(26px,3vw,34px)}.fg-content h3{margin:28px 0 14px;font-size:23px}.fg-content h4{margin:20px 0 10px;font-size:18px}.fg-content>section{border-top:1px solid var(--line);margin:30px 0;padding:34px 0}.fg-content section>section{background:var(--panel-soft);border:1px solid var(--line);border-radius:6px;margin:24px 0;padding:26px}.fg-content :is(.notice,.lab-gate){border:1px solid #dfbccb;border-left:4px solid var(--accent);color:#4a3440;background:#fcf2f6;border-radius:0 6px 6px 0;padding:20px 24px;font-size:15px;line-height:1.75}.fg-content .flow-step{border-left:3px solid var(--brand-blue);background:#f1f5fa;border-radius:0 6px 6px 0;margin:16px 0;padding:20px 24px}.fg-content :is(ul,ol){padding-left:26px}.fg-content li{margin:9px 0}.fg-content pre{white-space:pre-wrap;overflow-wrap:anywhere;color:#edf3fc;background:#202737;border:1px solid #364258;border-radius:6px;padding:22px;font-size:14px;line-height:1.8}.fg-content code{overflow-wrap:anywhere;font-size:.88em}.fg-content pre code{font-size:inherit}.fg-content figure{margin:24px 0}.fg-content :is(img,video){max-width:100%;height:auto}.fg-content video{background:#091522;border-radius:6px;width:100%;display:block}.fg-content .diagram-scroll{border:1px solid var(--line);background:#091522;border-radius:6px;overflow:auto}.fg-content .diagram-scroll img{width:1200px;max-width:none;height:650px;display:block}.fg-content .diagram-scroll img[src$=gns3-workspace\.svg]{width:1500px;height:1000px}.fg-content :is(figcaption,small,.slow-film-label){color:var(--muted);font-size:14px;line-height:1.7}.fg-content button{background:var(--accent);color:#fff;border:1px solid var(--accent);font:inherit;cursor:pointer;border-radius:6px;margin:6px 8px 6px 0;padding:11px 18px;font-size:15px}.fg-content button:hover{background:var(--accent-dark)}.fg-content button:disabled{opacity:.5;cursor:default}.fg-content .quiz{margin:30px 0}.fg-content fieldset{border:1px solid var(--line);background:#fff;border-radius:6px;min-width:0;margin:22px 0;padding:22px}.fg-content legend{color:var(--ink);padding:0 8px;font-weight:600}.fg-content label{overflow-wrap:anywhere;cursor:pointer;padding:10px;display:block}.fg-content input[type=radio]{accent-color:var(--accent);margin-right:10px}.fg-content label:has(input:checked){background:#f8eff4;border-radius:4px}.fg-content :is(.feedback,output){color:var(--accent-dark);font-weight:550;display:block}.fg-content table{border-collapse:collapse;width:100%;margin:20px 0;font-size:15px;line-height:1.7}.fg-content :is(td,th){border:1px solid var(--line);text-align:left;vertical-align:top;overflow-wrap:anywhere;padding:14px}.fg-content th{color:var(--ink);background:#f1f5fa;font-weight:600}.fg-content details{border-top:1px solid var(--line);padding:14px 0}.fg-content summary{cursor:pointer;color:var(--accent-dark);padding:10px 0;font-weight:550}.fg-content .table-scroll{max-width:100%;overflow:auto}.fg-content .table-scroll table{min-width:500px}.fg-content .packet-explorer{border:1px solid var(--line);border-top:3px solid var(--accent);background:#f5f7fb;border-radius:6px;padding:28px}.fg-content .explorer-controls{flex-wrap:wrap;align-items:end;gap:12px;display:flex}.fg-content .explorer-controls label{flex:1;min-width:180px;padding:0}.fg-content .explorer-controls select{width:100%;max-width:100%;font:inherit;color:var(--ink);background:#fff;border:1px solid #b6b7c5;border-radius:6px;padding:12px;font-size:15px;display:block}.fg-content .explorer-topology{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:24px 0;display:grid}.fg-content .explorer-topology>div{border:2px solid var(--line);background:#fff;border-radius:6px;min-width:0;padding:16px;font-size:15px}.fg-content .explorer-topology>div.active{border-color:var(--accent);background:#f8eff4}.fg-content .explorer-topology>[data-node=dns]{grid-column:1/-1}.fg-content [hidden]{display:none!important}.fg-content .header-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}.fg-content .header-grid>div{border:1px solid var(--line);background:#fff;border-radius:6px;padding:20px}.fg-content .header-grid h4{color:var(--brand-blue);margin:0}.fg-content .header-grid p{margin-bottom:0}.fg-content .explorer-status{color:var(--accent-dark);font-size:15px;font-weight:600}.fg-content .hop-line{border-bottom:3px solid var(--brand-blue);min-height:80px;color:var(--ink);margin-bottom:24px;padding:12px 0 24px;font-weight:550;position:relative}.fg-content .packet-dot{background:var(--accent);border-radius:3px;width:28px;height:14px;display:block;position:absolute;bottom:-8px;left:0}.fg-content .is-playing .hop-line:not(.stationary) .packet-dot{animation:fg-packet-hop var(--step-time,6s) linear forwards}.fg-content .is-playing .hop-line.reverse .packet-dot{animation-direction:reverse}.fg-content .stationary .packet-dot{left:50%}.fg-content .is-fault .hop-line{border-color:#b42318}.fg-content .is-fault .packet-dot{background:#b42318}.fg-course-end{border-top:1px solid var(--line);margin:48px 0 64px;padding:28px 0}@keyframes fg-packet-hop{0%{left:0}to{left:calc(100% - 28px)}}@media (max-width:650px){.fg-shell{width:calc(100% - 32px)}.fg-intro{font-size:17px}.fg-navigation{gap:8px}.fg-navigation a{padding:8px 10px;font-size:13px}.fg-content{font-size:16px}.fg-content :is(.header-grid,.explorer-topology){grid-template-columns:1fr}.fg-content .explorer-controls label{flex-basis:100%;min-width:0}.fg-content :is(.packet-explorer,fieldset){padding:16px}.fg-content section>section{padding:18px}.fg-content :is(.notice,.lab-gate,.flow-step,pre){padding:16px}.fg-content :is(td,th){padding:9px;font-size:13px}}@media (prefers-reduced-motion:reduce){.fg-content .packet-dot{animation:none!important}}