:root{
  --pfv-site-header-height:72px;
  --pfv-sticky-top:calc(var(--pfv-site-header-height) + 12px);
}

.flow-nav-controls{display:flex;gap:8px;flex-wrap:wrap}
.autoplay-toggle{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);border-radius:10px;padding:6px 10px;background:#fff;font-size:12px;font-weight:800;color:#314667}
.autoplay-toggle input{width:auto;accent-color:var(--blue)}
.scenario-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 12px}
.scenario-tab{border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 12px;font-weight:800;color:#314667;cursor:pointer}
.scenario-tab.active{background:var(--blue);border-color:var(--blue);color:#fff}
.flow-layout{display:grid;grid-template-columns:1.4fr .9fr;gap:14px;margin-top:14px}
.flow-details-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:14px;margin-top:14px}
.flow-card{border:1px solid var(--line);border-radius:14px;padding:16px;background:#fbfcfe}
.flow-card h3{margin:0 0 8px}
.flow-diagram-column{position:sticky;top:var(--pfv-sticky-top);align-self:start}
.flow-timeline-column{align-self:start}
.scenario-meta{margin:10px 0 0;border:1px solid #d6e2f2;border-radius:12px;background:#fff;padding:10px 12px;color:var(--muted);font-size:13px;line-height:1.55}
.scenario-meta strong{display:block;color:#22324d;margin-bottom:4px}

.mobile-step-bar{display:none}

.dhcp-mode-switch{margin:12px 0 4px;border:1px solid #d6e2f2;border-radius:12px;background:#fff;padding:10px 12px}
.dhcp-mode-options{display:flex;gap:12px;flex-wrap:wrap}
.dhcp-mode-options label{display:inline-flex;align-items:center;gap:7px;font-size:13px;color:#2b3f5f;font-weight:700}
.dhcp-mode-options input{width:auto;accent-color:var(--blue)}

.dora-progress{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.dora-progress span{border:1px solid #d6e2f2;border-radius:999px;background:#f8fbff;padding:4px 10px;font-size:11px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:#5e7699}
.dora-progress span.active{background:#e8f1ff;border-color:#82a8e7;color:#1f4a86}

.diagram-canvas{position:relative;overflow:hidden;border:1px solid #dbe5f3;border-radius:14px;padding:10px;background:#f4f8fe}
.diagram-main{display:grid;gap:8px}
.diagram-row{display:flex;gap:8px;align-items:stretch;flex-wrap:nowrap}

.flow-node{flex:1;min-width:120px;border:1px solid #dbe5f3;background:#fff;border-radius:12px;padding:10px;display:grid;gap:4px;align-content:start;min-height:92px;transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease}
.flow-node strong{font-size:14px}
.flow-node span{font-size:12px;line-height:1.5;color:var(--muted)}
.flow-node.active{border-color:#7da6e8;box-shadow:0 8px 20px rgba(41,101,196,.16);transform:translateY(-2px)}
.flow-node.source{border-color:#4b88e6;box-shadow:0 0 0 2px rgba(75,136,230,.15)}
.flow-node.destination{border-color:#2fa46f;box-shadow:0 0 0 2px rgba(47,164,111,.18)}
.flow-node.current{border-color:#2fa46f;box-shadow:0 8px 20px rgba(47,164,111,.18)}

.node-tags{display:flex;flex-wrap:wrap;gap:5px}
.node-tag{display:inline-block;border:1px solid #d6e2f2;border-radius:999px;background:#f8fbff;padding:2px 7px;font-size:10px;line-height:1.2;color:#4d698f;font-weight:800;letter-spacing:.03em;text-transform:uppercase}
.node-tag.vlan10{border-color:#95b8eb;color:#1f4a86}
.node-tag.vlan20{border-color:#7fc69d;color:#1e6a43}

.flow-hop{width:34px;display:grid;place-items:center;font-size:19px;font-weight:900;color:#98abc6;transition:color .18s ease,background .18s ease,border-color .18s ease;align-self:center;border:1px dashed #cad8ec;border-radius:10px;background:#f7fbff}
.flow-hop.active{color:var(--blue)}
.flow-hop.broadcast{color:#d98d00}
.flow-hop.link-vlan10.active{border-color:#95b8eb;background:#edf4ff}
.flow-hop.link-vlan20.active{border-color:#7fc69d;background:#eef9f2}
.flow-hop.link-routed.active{border-color:#f2c27f;background:#fff7ea}
.flow-hop.link-broadcast.active{border-style:solid;background:repeating-linear-gradient(135deg,#fff2d9,#fff2d9 6px,#ffe6bc 6px,#ffe6bc 12px)}

.diagram-event{margin-top:10px;border:1px solid #d6e2f2;background:#fff;border-radius:10px;padding:10px 12px;color:var(--muted);font-size:13px;line-height:1.55}

.traffic-legend{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.traffic-pill{display:inline-flex;align-items:center;gap:6px;border:1px solid #d6e2f2;border-radius:999px;background:#fff;padding:4px 9px;font-size:11px;font-weight:800;color:#304665}
.traffic-pill i{display:inline-block;width:10px;height:10px;border-radius:999px}
.traffic-pill.broadcast i{background:#d98d00}
.traffic-pill.unicast i{background:#2fa46f}
.traffic-pill.packet i{background:var(--blue)}
.traffic-pill.routed i{background:#9a6cc6}

.traffic-marker{position:absolute;left:0;top:0;transform:translate(-9999px,-9999px);width:20px;height:20px;border-radius:999px;background:var(--blue);box-shadow:0 6px 16px rgba(41,101,196,.35);display:grid;place-items:center;z-index:3;pointer-events:none;opacity:0}
.traffic-marker .marker-label{position:absolute;top:-22px;left:50%;transform:translateX(-50%);font-size:10px;font-weight:800;letter-spacing:.03em;color:#22324d;background:#fff;border:1px solid #d6e2f2;border-radius:999px;padding:2px 7px;white-space:nowrap}
.traffic-marker.visible{opacity:1}
.traffic-marker.packet{background:var(--blue)}
.traffic-marker.frame{background:#2fa46f}
.traffic-marker.broadcast{background:#d98d00;box-shadow:0 0 0 0 rgba(217,141,0,.45);animation:broadcastPulse 1s ease-out infinite}
.traffic-marker.routed{background:#9a6cc6}

@keyframes broadcastPulse{
  0%{box-shadow:0 0 0 0 rgba(217,141,0,.45)}
  70%{box-shadow:0 0 0 12px rgba(217,141,0,0)}
  100%{box-shadow:0 0 0 0 rgba(217,141,0,0)}
}
.step-timeline{display:grid;gap:8px;padding-left:0;list-style:none;margin:10px 0 0}
.step-item{margin:0}
.step-button{width:100%;text-align:left;border:1px solid #d6e2f2;border-radius:11px;background:#fff;padding:10px 12px;display:grid;gap:4px;cursor:pointer;transition:border-color .18s ease,background .18s ease}
.step-button .step-index{font-size:11px;font-weight:800;color:#6a7f9c;letter-spacing:.04em;text-transform:uppercase}
.step-button .step-title{font-weight:800;color:#1f2f49}
.step-button .step-note{font-size:12px;color:var(--muted);line-height:1.45}
.step-button .step-badges{display:flex;gap:6px;flex-wrap:wrap}
.step-badge{display:inline-block;border:1px solid #d6e2f2;border-radius:999px;background:#f8fbff;padding:2px 7px;font-size:10px;line-height:1.2;color:#4d698f;font-weight:800;letter-spacing:.02em;text-transform:uppercase}
.step-item.active .step-button{border-color:#7da6e8;background:#edf4ff}
.layer-stack{display:grid;gap:9px;margin-top:12px}
.layer-item{border:1px solid #d6e2f2;border-radius:10px;background:#fff;overflow:hidden}
.layer-item summary{list-style:none;cursor:pointer;padding:10px 12px;font-weight:800;display:flex;justify-content:space-between;align-items:center}
.layer-item summary::-webkit-details-marker{display:none}
.layer-item summary span{font-size:11px;font-weight:800;color:#6a7f9c;text-transform:uppercase;letter-spacing:.04em}
.layer-item .layer-body{padding:0 12px 12px;color:var(--muted);font-size:13px;line-height:1.55}
.layer-item .layer-body ul{margin:0;padding-left:18px;display:grid;gap:5px}
.change-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.change-grid h4{margin:10px 0 8px}
.bullet-list{margin:0;padding-left:18px;display:grid;gap:7px;color:var(--muted);font-size:13px;line-height:1.5}
.term-chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.term-chip{border:1px solid #d6e2f2;background:#fff;border-radius:999px;padding:7px 11px;font-size:12px;font-weight:800;color:#2a3e5f;cursor:help}
.term-chip:hover,.term-chip:focus{outline:none;border-color:#7da6e8;background:#eef4ff}
.term-tooltip{margin-top:10px;border:1px solid #d6e2f2;border-radius:10px;background:#fff;padding:10px 12px;color:var(--muted);font-size:13px;line-height:1.55;min-height:44px}

@media(max-width:1020px){
  .topbar .main-nav{gap:0}
  .topbar .main-nav a{padding:6px 9px !important;font-size:13px}
  .topbar .site-logo{width:232px}
  .flow-layout,.flow-details-grid{grid-template-columns:1fr}
  .flow-diagram-column{position:static;top:auto}
}

@media(max-width:760px){
  :root{--pfv-site-header-height:64px}
  .mobile-step-bar{position:sticky;top:var(--pfv-sticky-top);z-index:30;display:flex;justify-content:space-between;gap:10px;align-items:flex-start;margin:12px 0 8px;padding:9px 10px;border:1px solid #d6e2f2;border-radius:12px;background:rgba(255,255,255,.97);backdrop-filter:blur(8px)}
  .mobile-step-meta{display:grid;gap:2px;min-width:0}
  .mobile-step-meta strong{font-size:11px;line-height:1.2;letter-spacing:.03em;text-transform:uppercase;color:#3e5778}
  .mobile-step-meta span{font-size:12px;line-height:1.35;color:#2a3e5f;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:53vw}
  .mobile-step-actions{display:grid;gap:6px;justify-items:end}
  .mobile-step-traffic{font-size:10px;line-height:1.2;font-weight:800;text-transform:uppercase;letter-spacing:.03em;color:#4d698f;border:1px solid #d6e2f2;border-radius:999px;background:#f8fbff;padding:2px 7px}
  .dhcp-mode-options{flex-direction:column;align-items:flex-start}
  .diagram-row{flex-direction:column;align-items:stretch}
  .flow-node{min-width:0;min-height:84px}
  .flow-hop{width:100%;height:26px;font-size:15px}
  .change-grid{grid-template-columns:1fr}
}

@media(max-width:820px){
  :root{--pfv-site-header-height:64px}
}

@media (prefers-reduced-motion: reduce){
  .flow-node,.flow-hop,.step-button,.traffic-marker{transition:none}
  .traffic-marker.broadcast{animation:none}
}