:root{color-scheme:light;--ink:#131b2b;--muted:#536074;--line:#dce2ec;--blue:#1536dc;--blue-soft:#edf1ff;--green:#087c5e;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;--sans:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#f5f7fa;color:var(--ink);font:16px/1.55 var(--sans)}button,select,input{font:inherit}button,a,summary{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.35}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,pre:focus-visible,.code-window:focus-visible{outline:3px solid 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var(--line);border-radius:12px;overflow:hidden;margin-bottom:27px}.topology-wrap{padding:16px 32px 14px;border-right:1px solid var(--line);background:radial-gradient(#dce3f0 .75px,transparent .75px);background-size:16px 16px}.topology-wrap svg{display:block;width:100%;height:205px}.diagram-caption{font-size:12px;color:var(--muted);text-align:center}.network-line{stroke:#b4bed0;stroke-width:3;fill:none}.network-line.active{stroke:var(--blue)}.network-line.alt{stroke-dasharray:6 6}.network-node{fill:white;stroke:#ccd5e6;stroke-width:2}.network-label{fill:var(--ink);font:600 17px var(--sans)}.network-cost{font:14px var(--mono);fill:var(--muted)}.network-cost.alert{fill:#b55613;font-weight:700}.network-cost.success{fill:var(--green);font-weight:700}.network-note{font:13px var(--sans);fill:var(--muted)}.input-summary{padding:25px 30px}.summary-head{display:flex;justify-content:space-between;align-items:center;gap:20px}.summary-head 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var(--line);font-size:12px;color:var(--muted);margin-top:auto}.raw-pane .pane-footer{color:#a6b4ce;border-color:#2c3b54}.configzip-pane{background:white}.configzip-pane .pane-kicker{color:var(--blue)}.stage-content{padding:0 26px 24px;min-height:408px}.stage-content>p{font-size:14px;color:var(--muted)}.function-card{border:1px solid #dde4f2;border-radius:8px;margin-bottom:12px;padding:16px}.function-card .card-label{font:12px var(--mono);color:var(--blue);display:block;margin-bottom:9px}.function-card p{font:14px/1.65 var(--mono);color:#32405b;overflow-wrap:anywhere}.function-card small{display:block;font-size:12px;color:var(--muted);margin-top:10px}.fact-split{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0}.fact-cell{background:#f3f5f9;border-radius:6px;padding:15px}.fact-cell span{display:block;font-size:13px;color:var(--muted)}.fact-cell strong{display:block;font-size:30px;font-weight:600;color:var(--ink);margin-top:6px}.fact-cell.target{background:var(--blue-soft)}.fact-cell.target strong{color:var(--blue)}.operation{font:12px/1.6 var(--mono);color:var(--blue);background:var(--blue-soft);border-radius:4px;padding:8px 10px;overflow-wrap:anywhere;margin-bottom:18px}.chain{display:grid;gap:8px}.chain-node{text-align:left;background:#f4f6fa;border:1px solid #e0e6f0;border-radius:6px;padding:9px 12px;width:100%;color:var(--ink)}.chain-node.active{background:var(--blue-soft);border-color:#9faeff}.chain-node strong{font-size:13px;display:block;font-weight:600}.chain-node span{font-size:12px;color:var(--muted);display:block;margin-top:3px}.chain-node:after{content:'↳';float:right;color:#a3aec1;margin-top:-28px}.node-detail{font:12px/1.6 var(--mono);white-space:pre-wrap;overflow-wrap:anywhere;background:#f6f8fc;border-radius:6px;padding:13px;margin:14px 0 0;max-height:170px;overflow:auto}.source-table{width:100%;border-collapse:collapse;font:13px/1.65 var(--mono)}.source-table td{padding:10px 5px;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.source-table td:first-child{width:35px;color:#758199}.source-table .selected{background:#fff3dc;color:#875001}.line-target{display:flex;align-items:baseline;gap:12px;background:#fff6e7;margin-top:18px;padding:17px;border-radius:7px}.line-target strong{font-size:28px}.line-target span{font-size:14px}.diff{margin:0;background:#f4f6fa;padding:18px;border-radius:8px;font:13px/1.8 var(--mono);white-space:pre-wrap;overflow-wrap:anywhere}.diff .removed{display:block;color:#b04339;background:#ffedeb}.diff .added{display:block;color:#066d50;background:#e2f5ee}.verified-card{background:#eaf7f1;border:1px solid #c3e5d6;padding:20px;border-radius:8px;margin-bottom:20px}.verified-card strong{font-size:22px;color:var(--green);display:block}.verified-card p{color:#36785c;font-size:14px;margin-top:5px}.result-table{width:100%;border-collapse:collapse;font-size:14px}.result-table th,.result-table td{text-align:left;padding:11px 6px;border-bottom:1px solid var(--line)}.result-table th{font-size:12px;color:var(--muted);font-weight:500}.result-table td:not(:first-child){font-family:var(--mono);color:var(--green)}.stage-note{font-size:12px!important;color:var(--muted);margin-top:15px!important;line-height:1.6}.step-insight{display:flex;gap:28px;background:#eaf0ff;border-left:3px solid var(--blue);padding:20px 24px;margin-top:22px;align-items:center}.insight-label{font-size:11px;color:var(--blue);max-width:125px;flex-shrink:0}.step-insight p{font-size:15px;line-height:1.6}.record-details,.methodology{margin-top:20px;border-top:1px solid var(--line);padding-top:16px;font-size:14px}.record-details summary,.methodology summary{cursor:pointer;color:var(--muted);padding:5px 0}.record-details pre{background:#e9edf4;border-radius:8px;padding:20px;white-space:pre-wrap;overflow-wrap:anywhere;max-height:440px;overflow:auto;font:12px/1.6 var(--mono)}.methodology{margin-top:32px}.methodology>div{display:grid;grid-template-columns:1fr 1fr;gap:26px;margin-top:14px;padding:0 0 8px;color:var(--muted)}.methodology h3{font-size:15px;color:var(--ink);margin-bottom:8px}.methodology p{font-size:13px;line-height:1.8}.footer{border-top:1px solid var(--line);max-width:1280px;margin:auto;padding:24px 0 36px;display:flex;gap:30px;font-size:12px;color:var(--muted)}.footer strong{color:var(--ink);font-size:15px}.footer span:last-child{margin-left:auto}.pill{display:inline-block;border:1px solid #b4daca;background:#eaf7f1;color:var(--green);border-radius:20px;font-size:13px;padding:6px 12px;white-space:nowrap}.scale-controls{display:grid;grid-template-columns:1.5fr 1fr;gap:50px;background:white;border:1px solid var(--line);border-radius:12px;padding:25px 30px;margin-bottom:22px}.scale-range{display:grid;grid-template-columns:1fr auto;align-items:center;gap:10px}.scale-range label,.budget-control label{font-size:14px;font-weight:600}.scale-range output{font:22px var(--mono);color:var(--blue)}.scale-range input{grid-column:1/-1;width:100%;accent-color:var(--blue);cursor:pointer;margin:12px 0 4px}.range-labels{display:flex;justify-content:space-between;grid-column:1/-1;font:12px var(--mono);color:var(--muted)}.budget-control{display:flex;flex-direction:column;gap:8px;border-left:1px solid var(--line);padding-left:40px}.budget-control select{padding:10px 12px;border:1px solid var(--line);border-radius:6px;background:white;color:var(--ink);font:14px var(--mono)}.budget-control small{font-size:12px;color:var(--muted)}.scale-results{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:24px}.scale-result{background:white;border:1px solid var(--line);border-radius:9px;padding:23px;min-width:0}.scale-result.featured{border:1.5px solid var(--blue);background:#f1f4ff}.scale-result>p{font-size:14px;color:var(--muted)}.scale-result>strong{display:block;font:clamp(22px,2.3vw,32px)/1.4 var(--mono);margin:11px 0 0;letter-spacing:-1px}.scale-result.featured>strong{color:var(--blue)}.scale-result small{font-size:12px;color:var(--muted)}.budget-track{height:6px;background:#e3e8f1;margin:18px 0 12px}.budget-track div{height:100%;background:#9facc2}.scale-result.featured .budget-track div{background:var(--blue)}.budget-state{font-size:13px;color:#9b4d11}.budget-state.fits{color:var(--green)}.scale-chart-card{background:white;border:1px solid var(--line);border-radius:12px;padding:26px}.chart-title{display:flex;justify-content:space-between;gap:20px}.chart-title>span{font-size:12px;color:var(--muted)}.chart-legend{display:flex;gap:25px;flex-wrap:wrap;font-size:12px;margin:17px 0 2px}.chart-legend>span:before{content:'';display:inline-block;width:20px;height:3px;margin:0 7px 3px 0;background:#8e9cb4}.chart-legend>.legend-spec:before{background:#bb7426}.chart-legend>.legend-function:before{background:var(--blue)}#scale-chart svg{width:100%;height:auto;display:block;overflow:visible}.scale-explanation{margin-top:22px;display:grid;grid-template-columns:1fr 1fr;gap:24px}.scale-explanation>div{border-top:2px solid var(--line);padding-top:17px}.scale-explanation strong{font-size:24px;letter-spacing:-.5px;color:var(--blue)}.scale-explanation p{font-size:14px;color:var(--muted);margin-top:7px}.skip{position:absolute;left:12px;top:-80px;background:white;padding:12px;z-index:10}.skip:focus{top:8px}
@media(min-width:1500px){main{padding-top:48px}.intro{margin-bottom:42px}.topology-wrap svg{height:220px}}
@media(max-width:1350px){main,.footer{margin-left:32px;margin-right:32px}.header{padding:0 32px}}
@media(max-width:900px){main{padding-top:28px}.intro{align-items:start}.intro .download{margin-top:3px}.lead{max-width:490px}.overview{grid-template-columns:1fr 1fr}.input-summary{padding:20px}.summary-head{display:block}.summary-head strong{display:block;margin-top:5px;font-size:30px}.input-summary>p{font-size:12px}.summary-foot{display:block}.summary-foot span{display:block}.topology-wrap{padding:20px 10px}.topology-wrap svg{height:225px}.pane-heading{padding:20px 20px 0}.pane-heading h3{font-size:20px}.pane-description{padding:10px 20px 15px;min-height:88px}.stage-content{padding:0 20px 20px}.device-tabs{padding:0 20px 12px}.pane-footer{padding:14px 20px}.comparison{gap:15px}.step-button{font-size:13px;gap:5px}.scale-controls{gap:22px}.budget-control{padding-left:22px}.scenario-state{padding-left:20px;gap:10px}.code-line{font-size:12px}.summary-head h3{font-size:17px}}
@media(max-width:680px){.header{height:70px;padding:0 20px}.brand-detail,.replay-label{display:none}.header-actions{gap:0}.brand strong{font-size:23px}.brand-mark{width:34px;line-height:34px;font-size:21px}main,.footer{margin:0 20px}.intro{display:block;margin-bottom:24px}.eyebrow{font-size:10px;letter-spacing:1.2px}h1{font-size:29px;letter-spacing:-.9px}.lead{font-size:14px}.download{display:inline-block;margin-top:15px!important;font-size:13px}.view-tabs{gap:26px}.view-tab{font-size:14px;gap:7px}.scenario{align-items:start}.scenario h2{font-size:20px}.scenario p{font-size:13px}.scenario-state{display:none}.section-index{font-size:10px}.overview{grid-template-columns:1fr}.topology-wrap{border-right:0;border-bottom:1px solid var(--line);padding:9px 20px 14px}.topology-wrap svg{height:183px}.input-summary{padding:20px 23px}.summary-head{display:flex}.summary-head strong{margin:0;font-size:33px}.input-summary>p{font-size:13px;margin-top:7px}.summary-foot{display:flex}.playback{flex-wrap:wrap;gap:10px}.playback>p{order:3;flex-basis:100%;font-size:12px}.step-nav{grid-template-columns:repeat(3,1fr);gap:5px 10px}.step-button{padding-bottom:10px;font-size:13px}.comparison{grid-template-columns:1fr;gap:18px}.pane-description{min-height:0}.code-window{height:235px}.stage-content{min-height:340px}.step-insight{display:block;padding:16px 19px}.step-insight .insight-label{display:block;max-width:none;margin-bottom:8px}.step-insight p{font-size:14px}.footer{flex-wrap:wrap;gap:10px 20px;padding:24px 0}.footer span:last-child{margin-left:0;flex-basis:100%}.methodology>div{grid-template-columns:1fr;gap:20px}.scale-controls{grid-template-columns:1fr;gap:22px;padding:22px}.budget-control{border-left:0;border-top:1px solid var(--line);padding:20px 0 0}.scale-results{grid-template-columns:1fr}.scale-result{display:grid;grid-template-columns:1fr auto;column-gap:10px;padding:20px}.scale-result>strong{font-size:25px;margin:0}.scale-result>small{grid-column:2}.scale-result .budget-track,.scale-result .budget-state{grid-column:1/-1}.scale-result .budget-track{margin:10px 0}.scale-chart-card{padding:20px 15px}.chart-title{display:block}.chart-title>span{display:block;margin-top:5px}.chart-title h3{font-size:16px}.chart-legend{gap:8px 15px;font-size:11px}.scale-explanation{grid-template-columns:1fr}.pill{font-size:11px;white-space:normal;text-align:center;max-width:100px}.record-details pre{padding:12px}.line-num{flex-basis:44px}.code-line.highlight .line-num{flex-basis:41px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}

@media(max-width:680px){.network-cost{font-size:20px}.network-note{font-size:16px}.network-label{font-size:22px}.chart-legend{font-size:12px}}
.device-picker{display:grid;grid-template-columns:1fr auto;gap:8px 16px;padding:0 26px 12px;align-items:center}.device-picker label{font-size:12px;color:#aebcd3;grid-column:1/-1}.device-picker select{font:13px var(--mono);background:#1c2a42;color:#e7edf9;border:1px solid #445370;padding:8px;border-radius:4px;min-width:0}.device-picker a{font-size:12px;color:#bbccff;text-decoration:none}.record-download{display:inline-block;font-size:13px;margin:15px 0 0}.fact-cell strong{font-size:27px}.topology-wrap svg{height:235px}.network-note{font-size:18px}.network-label{font-size:20px}.network-cost{font-size:19px}@media(max-width:680px){.device-picker{padding:0 20px 12px;grid-template-columns:1fr}.device-picker label{grid-column:1}.device-picker a{margin-top:3px}.topology-wrap{padding:12px 8px}.topology-wrap svg{height:210px}.topology-wrap .network-note{font-size:22px}.topology-wrap .network-cost{font-size:23px}.topology-wrap .network-label{font-size:24px}.fact-cell strong{font-size:23px}}

/* Multi-protocol investigation */
.intro{margin-bottom:24px}.intro h1{font-size:clamp(26px,2.8vw,38px)}.fault-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:0 0 15px}.fault-card{text-align:left;background:#fff;border:1px solid var(--line);border-top:3px solid #bc623f;border-radius:7px;padding:14px 16px;color:var(--ink)}.fault-card.selected{background:#fff8ed;border-color:#c68b3d}.fault-card.fixed{border-top-color:var(--green)}.fault-card-top{display:flex;justify-content:space-between;gap:8px;font-size:12px;color:#8c4c2c;margin-bottom:6px}.fault-card.fixed .fault-card-top{color:var(--green)}.fault-card>strong{display:block;font-size:15px;line-height:1.4}.fault-card>small{display:block;font:12px var(--mono);color:var(--muted);margin-top:9px}.phase-status{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);background:white;border-radius:6px;margin-bottom:22px;padding:12px 0}.phase-status>div{padding:0 15px;border-right:1px solid var(--line);display:flex;justify-content:space-between;gap:8px;font-size:14px}.phase-status>div:last-child{border:0}.outcome{white-space:nowrap;font-size:13px;font-family:var(--sans)}.outcome.ok,.success-text{color:var(--green)!important}.outcome.blocked,.blocked-text{color:#ab4939!important}.scenario-state strong span{font-size:23px}.source-heading{font:13px var(--mono);margin:18px 0 10px;color:var(--muted)}.source-table td{white-space:pre-wrap;word-break:break-word}.snapshot-label{font-size:12px;color:#bccbeb;padding:4px 26px 9px}.code-window{position:relative}.stage-content{min-height:430px}.chain-node strong{font-family:var(--mono);font-size:12px}.table-scroll{overflow-x:auto}.result-table td:not(:first-child){color:var(--ink)}.combinations th,.combinations td{text-align:center}.combinations .all-fixed{background:#eaf7f1}.topology-wrap svg{height:245px}.topology-wrap .network-note{font-size:17px}.topology-wrap .network-cost{font-size:18px}.topology-wrap .network-label{font-size:20px}.overview{grid-template-columns:1.2fr 1fr}.step-nav{grid-template-columns:repeat(6,1fr)}.step-button{font-size:13px}.playback{margin-top:3px}
@media(max-width:1000px){.phase-status>div{display:block}.phase-status .outcome{display:block;margin-top:3px}.fault-card-top{display:block}.fault-card-top>span{display:block;margin-top:3px}.fault-card{padding:12px}.fault-card>strong{font-size:14px}.overview{grid-template-columns:1fr 1fr}}
@media(max-width:680px){.fault-cards{grid-template-columns:1fr;gap:8px}.fault-card{display:grid;grid-template-columns:100px 1fr;column-gap:8px;padding:12px}.fault-card-top{grid-row:1/3;margin:0}.fault-card>small{margin-top:5px}.phase-status{grid-template-columns:repeat(2,1fr);row-gap:12px;padding:14px 0}.phase-status>div:nth-child(2){border:0}.phase-status>div{display:flex}.phase-status .outcome{margin-top:0}.overview{grid-template-columns:1fr}.step-nav{grid-template-columns:repeat(3,1fr)}.topology-wrap svg{height:180px}.topology-wrap .network-label{font-size:22px}.topology-wrap .network-note,.topology-wrap .network-cost{font-size:20px}.result-table{font-size:12px}.result-table th,.result-table td{padding:9px 4px}.result-table .outcome{font-size:12px}.snapshot-label{padding-left:20px}.stage-content{min-height:0}.intro h1{font-size:28px}}

@media(min-width:681px) and (max-width:900px){.overview{grid-template-columns:1fr}.topology-wrap{border-right:0;border-bottom:1px solid var(--line)}.topology-wrap svg{height:260px}.input-summary{padding:22px 28px}.summary-head{display:flex}.summary-head strong{margin:0}.summary-foot{display:flex}}
@media(max-width:680px){.topology-wrap .network-note,.topology-wrap .network-cost{font-size:25px}.topology-wrap .network-label{font-size:26px}}

/* Recorded research cases */
.case-origin{margin:14px 0 22px;color:#58677e;font-size:14px;line-height:1.65;max-width:1000px}
.failure-table{margin:20px 0 28px;background:white;border:1px solid #dce3f0;border-radius:10px;padding:12px 22px}
.query-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.query-list li{display:grid;grid-template-columns:64px 1fr;gap:4px 14px;padding:9px 0;border-bottom:1px solid #e5eaf2}
.query-list li>span{grid-row:span 2;color:#66748b;font-size:14px}
.query-list strong{font-size:15px}.query-list small{font-size:13px;color:#66748b}
#failure-code{height:540px}.methodology code{overflow-wrap:anywhere;word-break:break-word}
#topology svg{display:block;width:100%;max-height:440px}.phase-status strong{font-size:15px}
.step-nav{overflow-x:auto}.view-tabs{flex-wrap:wrap}.source-heading,.stage-note{overflow-wrap:anywhere}
@media(max-width:600px){.failure-table{padding:8px}.query-list li{grid-template-columns:50px 1fr}.case-origin{font-size:14px}.view-tab{flex:1;padding-left:8px;padding-right:8px}#topology svg{max-height:360px}}