/* Study surfaces share the site's terminal palette and typography. */
[hidden]{display:none!important}
.kb-directory main{padding-bottom:52px}
.knowledge-intro{display:grid;grid-template-columns:1fr 270px;gap:48px;align-items:center;padding:24px 0 30px}
.knowledge-intro h1{font-size:clamp(38px,4.8vw,64px);letter-spacing:-3px;line-height:1.15}
.knowledge-deck{max-width:680px;color:var(--muted);font-size:14px}
.knowledge-tally{border-left:1px solid var(--line);padding:15px 0 15px 38px}
.knowledge-tally strong{display:block;font-size:90px;font-weight:400;color:var(--accent);line-height:1.1;letter-spacing:-6px}
.knowledge-tally>span{font-size:9px;letter-spacing:2px;color:var(--muted)}
.knowledge-tally p{font-size:11px;color:var(--muted)}
.basis-guide{border-block:1px solid var(--line);padding:16px 0;color:var(--muted);font-size:11px}
.basis-guide summary{cursor:pointer;color:var(--accent)}
.basis-guide p{max-width:930px;margin-bottom:4px}
.study-routes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin:34px 0}
.study-routes>a{border-bottom:1px solid var(--line);padding:10px 0 18px}
.study-routes h2{font-size:15px;margin:12px 0}
.study-routes p{font-size:10px;color:var(--muted);margin:0}
.study-routes a:hover h2{color:var(--accent)}
.review-console{display:flex;gap:30px;align-items:flex-start;justify-content:space-between;border:1px solid var(--line);background:var(--panel);padding:26px;margin:30px 0 60px}
.review-console>div{flex:1;min-width:0}
.review-console h2{font-size:20px;margin:7px 0}
.review-console p{font-size:12px;max-width:800px;color:var(--muted)}
.review-console button{flex-shrink:0;background:transparent;border:1px solid var(--accent);color:var(--accent);padding:10px 14px;font-size:10px}
.review-console details{border-top:1px solid var(--line);padding-top:16px;margin-top:20px;font-size:12px}
.review-console a{font-size:11px;color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.review-console summary,.retrieval-check summary{cursor:pointer;color:var(--accent)}
.knowledge-controls label{display:block;font-size:11px;margin-bottom:10px;color:var(--muted)}
.knowledge-controls input{width:100%;background:var(--panel);border:1px solid var(--line);padding:17px;color:var(--fg);font-size:13px}
.knowledge-filters{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}
.knowledge-filters button{background:transparent;border:1px solid var(--line);font-size:10px;padding:8px 12px;color:var(--muted)}
.knowledge-filters button[aria-pressed=true]{background:var(--accent);color:var(--bg);border-color:var(--accent)}
#knowledge-count{font-size:10px;color:var(--muted);margin:16px 0}
.knowledge-entry{display:grid;grid-template-columns:35px minmax(0,1fr) 175px 20px;gap:20px;align-items:center;border-top:1px solid var(--line);padding:26px 10px}
.knowledge-entry:last-child{border-bottom:1px solid var(--line)}
.knowledge-entry:hover{background:#b1f98c07}
.knowledge-entry h3{font-size:19px;font-weight:500;margin:5px 0 6px;letter-spacing:-.5px}
.knowledge-entry:hover h3{color:var(--accent)}
.knowledge-entry p{font-size:12px;color:var(--muted);margin:0;max-width:800px}
.note-number{align-self:start;padding-top:6px;color:var(--muted);font-size:10px}
.study-basis{display:inline-block;font-size:10px;color:var(--accent)}
.knowledge-entry>.study-basis{justify-self:end}
.entry-arrow{color:var(--accent);font-size:22px}
.quick-reference{margin-top:55px;border-top:1px solid var(--line);padding-top:28px}
.quick-reference h2{margin:8px 0 20px;font-weight:500}
.quick-reference>div{display:flex;flex-wrap:wrap;gap:15px 30px;color:var(--accent);font-size:13px}
.quick-reference a:hover{text-decoration:underline;text-underline-offset:5px}
.kb-article .container{max-width:850px}
.kb-article .post-title{margin:12px 0;overflow-wrap:anywhere}
.kb-article .post-meta{margin-bottom:0}
.kb-article .reading-meta{margin:12px 0}
.kb-article .principle-box{background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--accent);padding:24px 28px;margin:32px 0 22px}
.principle-box p{font-size:19px;line-height:1.65!important;margin:10px 0 0;letter-spacing:-.4px}
.study-body h2{margin:38px 0 12px;color:var(--fg)}
.study-body p,.study-body li{font-size:14px;line-height:1.9}
.study-body p{margin:14px 0}
.study-body li{margin:9px 0}
.study-body ul,.study-body ol{padding-left:24px}
.study-body strong{font-weight:600;color:#e3eddf}
.study-body code{color:var(--accent);font-size:.94em}
.study-body pre{overflow-x:auto;white-space:pre;font-size:12px}
.study-body pre code{overflow-wrap:normal}
.table-scroll{max-width:100%;overflow-x:auto;margin:22px 0;border:1px solid var(--line)}
.table-scroll:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
.study-body table{border-collapse:collapse;width:100%;font-size:12px;text-align:left}
.study-body th,.study-body td{padding:13px 15px;border-bottom:1px solid var(--line);vertical-align:top;min-width:100px}
.study-body th{background:var(--panel);color:var(--accent);font-weight:500}
.study-body tr:last-child td{border-bottom:0}
.formula{border:1px solid var(--line);background:var(--panel);padding:22px;font-size:14px;color:var(--accent);line-height:2}
.flow-diagram{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin:25px 0;padding:20px;border:1px solid var(--line);color:var(--accent);font-size:11px}
.retrieval-check{border:1px solid #527149;background:var(--panel);margin:45px 0 35px;padding:26px}
.retrieval-check h2{margin:8px 0}
.retrieval-check>p{font-size:15px}
.retrieval-check details{border-top:1px solid var(--line);padding-top:18px;font-size:13px}
.retrieval-check details p{color:var(--muted);margin-bottom:0}
summary:focus-visible{outline:2px solid var(--accent);outline-offset:5px}
.study-sources{font-size:11px;color:var(--muted);margin:35px 0}
.study-sources h2{font-size:15px}
.study-sources ul{padding-left:18px}
.study-sources li{margin:10px 0;overflow-wrap:anywhere}
.study-sources a{text-decoration:underline;text-underline-offset:4px}
.study-sources a:hover{color:var(--accent)}
.study-related{border-top:1px solid var(--line);padding-top:20px;margin-top:35px}
.study-related h2{font-size:18px}
.study-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.study-card{padding:22px;border:1px solid var(--line);background:var(--panel);display:flex;flex-direction:column}
.study-card h3{font-size:17px;font-weight:500;margin:12px 0;line-height:1.5}
.study-card h3 span{color:var(--accent)}
.study-card p{font-size:11px;color:var(--muted);margin:0 0 18px}
.study-card .study-basis{margin-top:auto}
.study-card:hover{border-color:#769766}
.study-pagination{display:flex;justify-content:space-between;gap:25px;border-top:1px solid var(--line);padding:25px 0;margin:35px 0;font-size:11px;color:var(--muted)}
.study-pagination>a{max-width:48%}
.study-pagination>a:last-child{text-align:right}
.study-pagination a:hover{color:var(--accent)}
.home-study-grid{margin:0 0 24px;grid-template-columns:repeat(3,minmax(0,1fr))}
.study-directory-link{margin:0 0 34px}
.quick-reference-label{display:block;margin:12px 0 18px}
@media(max-width:850px){.knowledge-intro{grid-template-columns:1fr 180px;gap:24px}.knowledge-tally{padding-left:24px}.knowledge-tally strong{font-size:75px}.study-routes{gap:18px}.study-routes .eyebrow{font-size:8px}.knowledge-entry{grid-template-columns:25px minmax(0,1fr) 20px;gap:15px}.knowledge-entry>.study-basis{grid-column:2;justify-self:start}.entry-arrow{grid-row:1;grid-column:3}.review-console{flex-direction:column;gap:12px}.home-study-grid{grid-template-columns:1fr}.home-study-grid .study-card{padding:22px}}
@media(max-width:600px){.knowledge-intro{grid-template-columns:1fr;padding-top:10px}.knowledge-intro h1{font-size:40px;letter-spacing:-2px}.knowledge-tally{border:0;border-top:1px solid var(--line);padding:18px 0 0;display:flex;align-items:center;gap:18px}.knowledge-tally strong{font-size:52px;letter-spacing:-2px}.knowledge-tally p{margin-left:auto;font-size:9px}.study-routes{grid-template-columns:1fr;gap:8px;margin:24px 0}.study-routes .eyebrow{font-size:9px}.review-console{padding:20px;margin-bottom:40px}.knowledge-entry{padding:20px 0;gap:10px}.knowledge-entry h3{font-size:16px}.knowledge-entry p{font-size:11px}.knowledge-entry .eyebrow{font-size:8px}.knowledge-controls input{font-size:12px;padding:14px}.study-grid{grid-template-columns:1fr}.kb-article .principle-box{padding:20px}.principle-box p{font-size:17px}.connection-note{padding:5px 10px 16px}.study-body p,.study-body li{font-size:13px}.retrieval-check{padding:20px}.retrieval-check .eyebrow{font-size:8px}.study-pagination{font-size:10px}.study-body table{min-width:550px}.kb-directory main{width:calc(100% - 32px)}}
@media print{html{color-scheme:light}.kb-article{background:#fff!important;color:#111!important}.kb-article .site-header,.kb-article .site-footer,.kb-article .toc,.reading-progress,.copy-code,.study-related,.study-pagination{display:none!important}.kb-article .container{width:100%;max-width:none!important}.kb-article *{color:#111!important;background:transparent!important;box-shadow:none!important}.kb-article .table-scroll{overflow:visible}.kb-article table{min-width:0}.kb-article .retrieval-check{break-inside:avoid}.kb-article .study-sources a{overflow-wrap:anywhere}}

/* A readable field notebook with interactive network workbenches. */
.kb-article{--cyan:#7cdce8;--amber:#ffca7a;--rose:#ffa5a5;--body:system-ui,-apple-system,"Segoe UI",sans-serif}
.kb-article .container{width:min(960px,calc(100% - 64px));max-width:960px!important}
.kb-article .post-title{font-size:clamp(2.2rem,5vw,4rem);letter-spacing:-.065em;line-height:1.18;margin:20px 0}
.kb-article .post-meta{display:flex;align-items:center;flex-wrap:wrap;gap:16px}
.note-kind{display:inline-block;border:1px solid var(--line);padding:5px 10px;color:var(--cyan);font-size:.875rem}
.kb-article .reading-meta,.kb-article .study-basis{font-size:.8rem}
.kb-article .principle-box{position:relative;padding:28px 32px;margin:30px 0 44px;background:linear-gradient(115deg,#182b1e99,#0c120e 80%);border-left-width:4px}
.principle-box:after{content:'';position:absolute;top:-1px;right:-1px;width:25px;height:25px;border-top:2px solid var(--accent);border-right:2px solid var(--accent)}
.kb-article .principle-box p{font:400 clamp(1.15rem,2vw,1.4rem)/1.65 var(--body);letter-spacing:0;max-width:70ch}
.kb-article .eyebrow{font-size:.75rem;letter-spacing:.12em}
.study-body{counter-reset:topic}
.study-body>h2{counter-increment:topic;display:flex;align-items:baseline;gap:16px;font-size:1.45rem;line-height:1.45;letter-spacing:-.045em;margin:52px 0 20px;scroll-margin-top:32px}
.study-body>h2:before{content:counter(topic,decimal-leading-zero);color:var(--accent);font-size:.8rem;letter-spacing:0;flex-shrink:0}
.study-body p,.study-body li{font:400 1.0625rem/1.85 var(--body);color:#c9d5cc}
.study-body>p,.study-body>ul,.study-body>ol{max-width:79ch}
.study-body p{margin:16px 0}
.study-body li{margin:12px 0;padding-left:4px}
.study-body li::marker{color:var(--accent);font-weight:600}
.study-body strong{font-weight:650;color:#eff7f0}
.study-body code{font-family:var(--mono);font-size:.86em;background:#b1f98c09;padding:1px 4px}
.study-body pre{font-size:.9rem;line-height:1.85;border:1px solid var(--line);border-left:3px solid var(--accent);padding:46px 24px 24px}
.study-body pre code{background:none;padding:0}
.study-body a{color:var(--cyan);text-decoration:underline;text-underline-offset:4px}
.study-body a:hover{color:var(--accent)}
.study-body .table-scroll{margin:26px 0;border-radius:6px}
.study-body table{font:400 1rem/1.65 var(--body)}
.study-body th{font-family:var(--mono);font-size:.875rem;background:#142019;color:#b6d9bd}
.study-body td,.study-body th{padding:18px 20px;min-width:110px}
.study-body td:first-child{color:#eef4ed;font-weight:550}
.study-body tbody tr:nth-child(even){background:#c4efca03}
.study-body .formula{font-size:1rem;padding:24px 30px;line-height:2.1}
.field-note{border-left:2px solid var(--cyan);padding:18px 24px;margin:32px 0;background:#7cdce806}
.field-note>strong{font-family:var(--mono);font-size:.9rem;color:var(--cyan)}
.field-note p{margin:8px 0 0}
.flow-diagram{font-size:.9rem;line-height:1.7;background:#142019}
.kb-article .toc{padding:18px 24px;border-radius:6px;margin:24px 0}
.kb-article .toc summary{font-size:.875rem}
.kb-article .toc ol{columns:2;column-gap:30px}
.kb-article .toc li{font-size:.875rem;break-inside:avoid;margin:10px 0;line-height:1.6}
.retrieval-check{padding:30px;border-color:#4a7053;background:linear-gradient(140deg,#14241a,#0c120e);border-radius:6px}
.retrieval-check h2{font-size:1.5rem;margin:12px 0}
.retrieval-check>p,.retrieval-check details p{font:1.0625rem/1.8 var(--body);color:var(--fg)}
.retrieval-check summary{font-size:.875rem}
.study-sources,.study-sources h2,.study-pagination,.study-card p{font-size:.875rem}
.study-sources li{line-height:1.8}
.study-card{border-radius:6px}
.study-card p{line-height:1.7}
.study-card .eyebrow,.study-card .study-basis{font-size:.75rem}
.knowledge-deck{font-size:1rem;line-height:1.8}
.knowledge-tally p,.knowledge-tally>span,.basis-guide,.knowledge-entry .eyebrow,.knowledge-entry .study-basis{font-size:.8rem}
.knowledge-controls label,.knowledge-controls input,.knowledge-filters button,#knowledge-count{font-size:.875rem}
.knowledge-entry p,.study-routes p{font-size:.9375rem;line-height:1.8}
.knowledge-entry h3{font-size:1.35rem}
.knowledge-entry{padding:28px 12px}
.study-routes .eyebrow{font-size:.75rem}
.study-routes h2{font-size:1.0625rem;line-height:1.6}
.review-console p,.review-console details{font-size:.9375rem;line-height:1.8}
.review-console button,.review-console a{font-size:.875rem}

.exercise{margin:44px 0;border:1px solid #35565a;border-radius:12px;overflow:hidden;background:radial-gradient(ellipse at 90% 0%,#1b475348,transparent 65%),#0b1418;box-shadow:0 20px 70px #0003;--exercise-line:#2b454d}
.exercise-heading{padding:28px 30px 22px;border-bottom:1px solid var(--exercise-line)}
.exercise-heading .eyebrow{color:var(--cyan)}
.exercise .exercise-heading h2{color:#e5f7f6;font-size:1.55rem;line-height:1.4;letter-spacing:-.04em;margin:12px 0}
.exercise-heading p{max-width:68ch;margin-bottom:0;color:#abc0c8}
.exercise-mount{padding:26px 30px 30px}
.exercise-controls{display:flex;align-items:center;gap:28px;justify-content:space-between;margin-bottom:24px;flex-wrap:wrap}
.exercise-controls>label{display:flex;flex:1;min-width:180px;flex-direction:column;gap:12px;font-size:.875rem;color:#d4e6e9}
.exercise input[type=text],.exercise select{font:1rem/1.5 var(--mono);padding:12px 14px;width:100%;min-width:0;background:#0a1116;border:1px solid #3e5965;border-radius:6px;color:#e5f4f6}
.exercise select{cursor:pointer;min-height:48px}
.exercise input[type=range]{width:100%;accent-color:var(--cyan);cursor:pointer;min-height:30px}
.exercise output{font-size:1.25rem;color:var(--cyan);font-family:var(--mono)}
.exercise-checks,.access-signals{display:grid;gap:12px}
.exercise .exercise-check{display:flex;align-items:center;gap:12px;min-height:44px;font-size:.9rem;color:#d0e2e6;line-height:1.6;cursor:pointer;flex-direction:row}
.exercise-check input{flex:0 0 auto;width:20px;height:20px;accent-color:var(--cyan);margin:0;cursor:pointer}
.exercise-check:has(input:disabled){opacity:.5;cursor:default}
.exercise :disabled{cursor:default;opacity:.5}
.exercise button{font:500 .875rem/1.5 var(--mono);padding:12px 18px;border:1px solid var(--cyan);border-radius:5px;background:var(--cyan);color:#09232b;min-height:46px}
.exercise button:hover:not(:disabled){background:#b5f5f7;border-color:#b5f5f7}
.exercise button:focus-visible,.exercise input:focus-visible,.exercise select:focus-visible,.network-stage:focus-visible{outline:2px solid #f5d192;outline-offset:4px}
.exercise .quiet-button{color:#bacbd1;border-color:#3b5660;background:transparent}
.exercise .quiet-button:hover:not(:disabled){background:#19323b;color:#e4f4f6}
.exercise-actions{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0}
.exercise-result,.subnet-result{border-top:1px solid var(--exercise-line);padding:22px 0 0;min-height:110px;font:1rem/1.8 var(--body);color:#c3d8df}
.exercise-result p,.subnet-result p{margin:10px 0;color:#c3d8df;font-size:1rem}
.result-label{font:500 1rem/1.6 var(--mono);color:var(--cyan)}
.exercise-result[data-outcome=deny] .result-label{color:var(--rose)}
.exercise .exercise-caption{font:400 .8rem/1.7 var(--mono);color:#9cafb8;margin-bottom:0}
.exercise-error{color:var(--rose)!important;font-size:.9rem!important}
.exercise-error:empty{display:none}
.bit-legend,.byte-legend,.network-legend{display:flex;flex-wrap:wrap;gap:18px;font-size:.8rem;color:#9dafb6;margin:18px 0;line-height:1.6}
.bit-legend i{display:inline-block;width:9px;height:9px;margin-right:6px;border-radius:2px}
.net-key{background:var(--cyan)}.host-key{background:var(--amber)}
.bit-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;margin:22px 0 35px}
.bit-octet{display:grid;grid-template-columns:repeat(8,1fr);gap:2px}
.bit-octet>span{font:500 .9rem/2.4 var(--mono);text-align:center;border-radius:3px}
.bit-octet .network-bit{color:var(--cyan);background:#7cdce818;border-bottom:2px solid #7cdce877}
.bit-octet .host-bit{color:var(--amber);background:#ffca7a14;border-bottom:2px solid #ffca7a66}
.bit-octet small{grid-column:1/-1;text-align:center;font-size:.75rem;color:#839da9;margin-top:7px;letter-spacing:.05em}
.metric-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--exercise-line);border:1px solid var(--exercise-line);border-radius:6px;overflow:hidden}
.metric-grid>div{padding:18px 20px;background:#101e24;min-width:0}
.metric-grid span{display:block;font:400 .8rem/1.6 var(--mono);color:#9fb7c2;margin-bottom:10px}
.metric-grid strong{font:500 1.125rem/1.6 var(--mono);color:#e0f9ff;overflow-wrap:anywhere}
.network-stage{padding:20px 0;background-image:linear-gradient(#8cdae506 1px,transparent 1px),linear-gradient(90deg,#8cdae506 1px,transparent 1px);background-size:20px 20px;border:1px solid var(--exercise-line);border-radius:8px;overflow:auto}
.network-stage svg{display:block;width:100%;min-width:600px;height:auto}
.network-stage text{font:500 14px var(--mono);text-anchor:middle;fill:#dcebee}
.network-stage .node-sub{font-size:13px;fill:#a8c4cb}
.network-cables path{stroke:#476575;stroke-width:2;fill:none}
.device-node rect{fill:#12282c;stroke:#51836c;stroke-width:1.5}
.staff-node .node-sub{fill:var(--accent)}
.guest-node rect{stroke:#bb8f50;fill:#292217}.guest-node .node-sub{fill:var(--amber)}
.server-node rect{stroke:#5babbf;fill:#102c35}.server-node .node-sub{fill:var(--cyan)}
.switch-chassis{fill:#152129;stroke:#4d6570;stroke-width:1.5}
.network-stage .switch-label{text-anchor:start;font-size:12px;letter-spacing:2px;fill:#819aa7}
.switch-ports circle{fill:var(--accent);stroke:#b1f98c44;stroke-width:6}
.switch-ports #vlan-guest-port{fill:var(--amber);stroke:#ffca7a44}
.switch-ports .server-port{fill:var(--cyan);stroke:#7cdce844}
.policy-node rect{fill:#18212b;stroke:#738ba5;stroke-width:1.5}
.vlan-direct,.vlan-routed{fill:none;stroke:var(--cyan);stroke-width:3;stroke-dasharray:8 7;opacity:0}
.network-stage[data-path=same] .vlan-direct,.network-stage[data-path=routed] .vlan-routed{opacity:1;animation:packet-travel 1.4s linear 3}
.network-stage[data-path=denied] .vlan-routed{stroke:var(--rose);opacity:.65}
.network-stage[data-path=denied] .vlan-to-server{opacity:0}
.network-stage[data-path=no-route] .policy-node{opacity:.35}
.network-stage[data-guest="30"] .guest-node rect{fill:#102c35;stroke:#5babbf}
.network-stage[data-guest="30"] .guest-node .node-sub{fill:var(--cyan)}
.network-stage[data-guest="30"] #vlan-guest-port{fill:var(--cyan);stroke:#7cdce844}
.staff-legend{color:var(--accent)}.guest-legend{color:var(--amber)}.server-legend{color:var(--cyan)}
.collector-count{text-align:right;flex-shrink:0}
.collector-count strong{font:500 1.8rem/1.4 var(--mono);color:var(--cyan);display:block}
.collector-count>span{font-size:.8rem;color:#9cafb8}
.log-feed{border:1px solid var(--exercise-line);border-radius:6px;overflow:hidden}
.log-row{display:grid;grid-template-columns:150px 1fr 130px;align-items:center;gap:14px;padding:18px;background:#101d24;border-bottom:1px solid var(--exercise-line)}
.log-row:last-child{border:0}
.log-row>div{min-width:0}
.log-row strong{display:block;font:500 .875rem var(--mono);margin-bottom:6px}
.log-row>div>span{font:1rem/1.6 var(--body);color:#b4c9d2}
.severity-tag,.delivery-state{font-size:.8rem;line-height:1.6}
.log-row[data-delivered=true] .delivery-state{color:var(--cyan)}
.log-row[data-delivered=false]{background:#101519}
.log-row[data-delivered=false] .delivery-state{color:var(--amber)}
.log-row[data-delivered=false]>div{opacity:.6}
.log-row{transition:background .25s,border-color .25s}
.dora-track{display:grid;grid-template-columns:repeat(4,1fr);border-block:1px solid var(--exercise-line);padding:24px 0;gap:12px}
.dora-track>div{position:relative;color:#8199a4;text-align:center}
.dora-track>div>span{display:block;margin:0 auto 12px;width:48px;height:48px;font:500 1.4rem/48px var(--mono);border:1px solid #35515e;border-radius:50%;background:#0e1c24}
.dora-track strong{font:500 .8rem var(--mono);color:inherit}
.dora-track [data-state=active]{color:var(--cyan)}
.dora-track [data-state=active]>span{border-color:var(--cyan);background:#7cdce815;box-shadow:0 0 25px #7cdce81a}
.dora-track [data-state=done]>span{border-color:#69a48f;color:var(--accent)}
.message-flight{display:flex;gap:20px;justify-content:space-between;align-items:center;padding:24px 0;font-size:.8rem;color:#b7ced7}
.flight-arrow{color:var(--cyan);letter-spacing:8px;transition:transform .3s}
.message-flight[data-direction=left] .flight-arrow{transform:rotate(180deg)}
.lease-card{border:1px solid var(--exercise-line);padding:22px;background:#10252b;border-radius:6px}
.lease-card>span{font-size:.75rem;color:#96b6c2;letter-spacing:.1em}
.lease-card>strong{display:block;font:500 1.4rem/1.6 var(--mono);margin:6px 0;color:var(--cyan);overflow-wrap:anywhere}
.lease-card p{font-size:.95rem;margin:4px 0;color:#b4c9d2}
.response-track{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.response-track button{background:#102029;border:1px solid #3a515e;text-align:left;color:#bacdd5;font-size:.8rem;padding:16px 12px}
.response-track button>span{display:block;font-size:1.7rem;line-height:1.4;margin-bottom:9px;color:#6c8c9c}
.response-track button[aria-pressed=true]{background:#16343b;color:var(--cyan);border-color:var(--cyan)}
.response-track button[aria-pressed=true]>span{color:var(--cyan)}
.response-track button:hover:not(:disabled){background:#234553;color:#e0f6ff}
.response-detail{padding-top:30px}
.response-detail>*{animation:study-reveal .32s ease-out both}
.response-detail>h3{animation-delay:.04s}.response-detail>p{animation-delay:.08s}
.response-detail h3{font-size:1.3rem;font-weight:500;letter-spacing:-.04em;margin:20px 0 10px}
.evidence-strip{font-size:.8rem;color:var(--amber);line-height:1.8}
.analyst-prompt{padding:20px;border-left:2px solid var(--cyan);background:#7cdce808;margin:24px 0}
.analyst-prompt>span{font-size:.75rem;letter-spacing:.1em;color:var(--cyan)}
.analyst-prompt p{margin:8px 0 0;font-size:1rem}
.access-signals{grid-template-columns:repeat(3,1fr);padding-bottom:24px}
.access-map{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:10px 0 28px}
.access-map>div{position:relative;padding:22px;border:1px solid var(--exercise-line);background:#12212b;border-radius:6px;text-align:center;min-width:0}
.access-map>div>span{font-size:.75rem;letter-spacing:.12em;color:#92afbc}
.access-map strong{display:block;font:500 1.05rem/1.5 var(--mono);margin-top:8px;color:#d1f3fc}
.access-map p{font-size:.9rem;line-height:1.6;margin:7px 0 0}
.access-map .access-policy,.access-map .access-resource{grid-column:1/-1}
.access-map .access-policy{border-color:#6b8ea4;background:#182c36}
.access-map .access-policy:before,.access-map .access-resource:before{content:'↓';position:absolute;top:-24px;left:calc(50% - 6px);color:var(--cyan)}
.access-map .access-resource{border-color:#a46a68;background:#2b1b21}
.access-map #access-decision{color:var(--rose);font-family:var(--mono);font-weight:600}
.access-map[data-allowed=true] .access-resource{background:#142d26;border-color:#638f72}
.access-map[data-allowed=true] #access-decision{color:var(--accent)}
.tcp-byte-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;max-width:480px;margin:20px auto 0}
.tcp-byte{font:500 .8rem/1.8 var(--mono);text-align:center;padding:7px 4px;border-radius:3px;border:1px solid #3e6473}
.base-byte{background:#18313b;color:var(--cyan)}
.option-byte{background:#293a22;color:var(--accent);border-color:#54723e}
.padding-byte{background:#3a2d19;color:var(--amber);border-color:#856332}
.byte-legend>span:nth-child(1){color:var(--cyan)}.byte-legend>span:nth-child(2){color:var(--accent)}.byte-legend>span:nth-child(3){color:var(--amber)}
.payload-start{max-width:480px;margin:12px auto 24px;text-align:center;padding:12px 0;border-top:2px dashed var(--cyan);color:var(--cyan);font-size:.75rem}
@keyframes packet-travel{to{stroke-dashoffset:-60}}
.arp-lan{padding:22px;border:1px solid #416e71;border-radius:8px;background:linear-gradient(90deg,#7cdce807 1px,transparent 1px),linear-gradient(#7cdce807 1px,transparent 1px),#0e2028;background-size:22px 22px}
.arp-zone,.arp-cache>span,.arp-device>span,.arp-frame span{display:block;font:.75rem/1.7 var(--mono);letter-spacing:.05em;color:#a0bcc8}
.arp-devices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:22px}
.arp-device{position:relative;padding:18px 12px;border:1px solid #41606b;border-radius:6px;background:#10212a;text-align:center;min-width:0}
.arp-device strong{display:block;font:500 .95rem/1.8 var(--mono);margin-top:8px;color:var(--cyan);overflow-wrap:anywhere}
.arp-device small,.arp-outside small{display:block;font:.8rem/1.6 var(--mono);color:#a8bdc5}
.arp-device:after{content:'';position:absolute;bottom:-22px;left:50%;height:22px;border-left:2px solid #41606b}
.arp-wire{height:2px;margin:20px 16.6% 0;background:#41606b}
.arp-outside{text-align:center;padding:24px 12px;color:#9db3c0}
.arp-outside>span{display:block;color:var(--amber);font-size:.8rem;margin-bottom:12px}
.arp-outside strong{display:block;font-size:.95rem;margin-bottom:8px}
.arp-phase{display:flex;justify-content:space-between;gap:10px;font:.75rem/1.7 var(--mono);color:var(--cyan);padding:12px 0}
.arp-topology[data-phase=request] .arp-device{border-color:var(--amber);box-shadow:0 0 20px #ffca7a15}
.arp-topology[data-phase=request] .arp-wire{background:var(--amber);animation:study-reveal .4s ease-out}
.arp-topology[data-phase=reply][data-target=printer] [data-arp-node=printer],.arp-topology[data-phase=frame][data-target=printer] [data-arp-node=printer],.arp-topology[data-phase=reply][data-target=gateway] [data-arp-node=gateway],.arp-topology[data-phase=frame][data-target=gateway] [data-arp-node=gateway]{border-color:var(--cyan);box-shadow:0 0 24px #7cdce824;background:#183944}
.arp-topology[data-phase=unanswered] .arp-lan{border-color:var(--rose)}
.arp-cache{padding:18px 20px;background:#080f14;border:1px solid var(--exercise-line);border-radius:6px;margin-top:20px}
.arp-cache ul{padding:0;margin:10px 0 0;list-style:none}.arp-cache li{display:flex;gap:14px;flex-wrap:wrap;padding:0;font-size:.875rem;margin:6px 0}
.arp-frame{border:1px solid #638d75;border-radius:6px;padding:16px;margin-top:14px;background:#132920}
.arp-frame>div+div{margin-top:14px;padding:14px;border:1px solid #345849;background:#0b1914}
.arp-frame strong{font:500 1.1rem/1.8 var(--mono);color:var(--accent);overflow-wrap:anywhere}
@media(max-width:600px){.arp-devices{grid-template-columns:1fr}.arp-device:after,.arp-wire{display:none}.arp-lan{padding:16px}.arp-phase{font-size:.7rem}.arp-frame strong{font-size:.95rem}}
/* Evidence cases and packet-path exercises use the same surfaces in the desktop reader. */
.case-evidence{border:1px solid var(--exercise-line);border-left:3px solid var(--cyan);padding:22px;background:linear-gradient(120deg,#7cdce80a,transparent)}
.case-evidence h3{font-size:1.2rem;line-height:1.5;margin:12px 0 16px}.case-evidence ul{margin:0;padding-left:22px}.case-evidence li{font-size:1rem;line-height:1.8;margin:10px 0}
.case-decisions{border:0;padding:0;min-width:0;margin:28px 0}.case-decisions legend{font:500 1rem/1.6 var(--mono);padding:0 0 16px;color:var(--cyan)}
.case-options{display:grid;gap:10px}.exercise .case-options button{display:flex;align-items:center;gap:18px;text-align:left;padding:16px 18px;border:1px solid var(--exercise-line);background:#7cdce806;color:inherit;font:400 .95rem/1.6 var(--mono);min-height:56px}
.case-options button>span{font-size:1.35rem;color:var(--cyan);opacity:.7}.exercise .case-options button[aria-pressed=true]{border-color:var(--cyan);box-shadow:inset 3px 0 var(--cyan);background:#7cdce810}.exercise .case-options button:hover{background:#7cdce815;color:var(--cyan)}
.exercise-result[data-outcome=reconsider]{border-left-color:var(--amber)}.exercise-result[data-outcome=supported]{border-left-color:var(--cyan)}
.flow-strip{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:24px 0}.flow-strip>div{flex:1;min-width:0;border:1px solid var(--exercise-line);padding:16px;background:#7cdce806;border-radius:6px}.flow-strip>span{color:var(--cyan)}
.flow-strip small{font:.75rem/1.6 var(--mono);letter-spacing:.06em;color:var(--cyan);display:block;margin-bottom:7px}.flow-strip strong{font:500 .95rem/1.6 var(--mono);overflow-wrap:anywhere}
.policy-ladder{list-style:none;padding:0!important;margin:12px 0 24px}.policy-ladder li{display:flex;gap:22px;border:1px solid var(--exercise-line);padding:20px;margin:10px 0;background:#7cdce804}
.policy-ladder li[data-stage=selected]{border-color:var(--cyan);background:#7cdce80c;box-shadow:inset 3px 0 var(--cyan)}.policy-ladder li[data-stage=skipped]{border-style:dashed;opacity:.65}.rule-position{font:400 1.7rem/1.4 var(--mono);color:var(--cyan)}
.policy-ladder strong{font:500 1.05rem/1.5 var(--mono)}.policy-ladder p{font-size:.95rem;margin:6px 0!important}.policy-ladder small{font:.75rem/1.7 var(--mono);color:var(--cyan)}
.exercise table caption{text-align:left;padding:10px 0 14px;font:.85rem/1.6 var(--mono);color:var(--cyan)}.route-table tr[data-selected=true]{background:#7cdce812;box-shadow:inset 3px 0 var(--cyan)}
.switch-panel{border:1px solid var(--exercise-line);border-radius:10px;padding:22px;background:linear-gradient(135deg,#7cdce808,transparent)}.switch-chassis-label{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font:.8rem/1.6 var(--mono);color:var(--cyan);border-bottom:1px solid var(--exercise-line);padding-bottom:18px}
.switch-ports{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;padding-top:20px}.switch-ports>div{min-width:0;text-align:center;padding:16px 8px;border:1px solid var(--exercise-line);border-radius:6px}
.port-jack{display:block;border:2px solid var(--exercise-line);border-top:5px double var(--exercise-line);width:44px;height:38px;line-height:30px;margin:0 auto 16px;font:500 1.2rem/30px var(--mono);color:var(--cyan);background:#7cdce807;border-radius:2px}
.switch-ports strong{display:block;font:.9rem/1.7 var(--mono)}.switch-ports small{display:block;font:.75rem/1.7 var(--mono);margin:6px 0 12px}.switch-ports b{font:500 .7rem/1.6 var(--mono);letter-spacing:.04em;color:var(--cyan)}
.switch-ports [data-state=ingress]{border-color:var(--amber);background:#ffca7a08}.switch-ports [data-state=ingress] .port-jack{border-color:var(--amber);color:var(--amber)}.switch-ports [data-state=egress]{border-color:var(--cyan);background:#7cdce80d}.switch-ports [data-state=egress] .port-jack{border-color:var(--cyan);box-shadow:0 0 20px #7cdce820}
.exercise button:focus-visible,.exercise select:focus-visible{outline:2px solid var(--cyan);outline-offset:4px}
@media(max-width:600px){.flow-strip{flex-direction:column}.flow-strip>div{width:100%}.flow-strip>span{transform:rotate(90deg)}.switch-ports{grid-template-columns:repeat(2,minmax(0,1fr))}.case-evidence{padding:18px}.policy-ladder li{gap:14px;padding:16px}}
@container(max-width:540px){.flow-strip{flex-direction:column}.flow-strip>div{width:100%}.flow-strip>span{transform:rotate(90deg)}.switch-ports{grid-template-columns:repeat(2,minmax(0,1fr))}}
/* OSI: seven compact layers, with detail revealed only on selection. */
.osi-map{position:relative;margin:22px 0 14px;padding:0 0 0 22px;isolation:isolate}
.osi-map:before{content:"";position:absolute;top:33px;bottom:33px;left:4px;width:1px;background:linear-gradient(180deg,rgb(var(--p-accent)/.8),rgb(var(--p-accent)/.15));z-index:-1}
.osi-map-guide{display:flex;justify-content:space-between;gap:12px;font:9px/1.7 var(--mono);letter-spacing:.07em;color:rgb(var(--p-muted));padding:0 2px 11px}
.osi-map-guide>span:first-child{color:var(--accent)}.osi-map-base{padding:11px 2px 0}
.osi-layer{position:relative;margin:0 0 7px;border:1px solid rgb(var(--p-edge)/.5);border-radius:8px;background:linear-gradient(100deg,rgb(var(--p-accent)/.055),transparent 65%),rgb(var(--p-base)/.5);overflow:visible}
.osi-layer:before{content:"";position:absolute;left:-22px;top:31px;width:5px;height:5px;border:1px solid var(--accent);border-radius:50%;background:rgb(var(--p-base));box-shadow:0 0 12px rgb(var(--p-accent)/.12)}
.osi-layer:last-of-type{margin-bottom:0}
.osi-layer>summary{display:grid;grid-template-columns:28px 30px minmax(0,1fr) 18px;align-items:center;gap:14px;min-height:60px;padding:10px 18px;cursor:pointer;list-style:none;border-radius:7px;color:var(--fg)}
.osi-layer>summary::-webkit-details-marker{display:none}.osi-layer>summary::marker{content:""}
.osi-layer>summary:hover{background:rgb(var(--p-accent)/.055)}
.osi-layer>summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
.osi-layer-number{font:400 25px/1 var(--mono);color:var(--accent);text-align:center}
.osi-layer-icon{display:block;width:29px;height:29px;fill:none;stroke:rgb(var(--p-muted));stroke-width:1.3;stroke-linecap:round;stroke-linejoin:round}
.osi-layer-label{display:grid;grid-template-columns:minmax(112px,.75fr) minmax(0,1.5fr);align-items:center;gap:12px;min-width:0}
.osi-layer-label strong{font:600 15px/1.5 var(--sans);color:var(--fg)}
.osi-layer-label>span{font:12px/1.65 var(--sans);color:rgb(var(--p-muted))}
.osi-layer-toggle{position:relative;width:14px;height:14px;justify-self:end;color:var(--accent)}
.osi-layer-toggle:before,.osi-layer-toggle:after{content:"";position:absolute;background:currentColor;border-radius:2px}.osi-layer-toggle:before{width:12px;height:1px;left:1px;top:6px}.osi-layer-toggle:after{width:1px;height:12px;left:6px;top:1px}
.osi-layer[open]{border-color:rgb(var(--p-accent)/.7);background:linear-gradient(120deg,rgb(var(--p-accent)/.075),transparent 65%),rgb(var(--p-base)/.75)}
.osi-layer[open]:before{background:var(--accent);box-shadow:0 0 13px rgb(var(--p-accent)/.35)}
.osi-layer[open]>summary{border-bottom:1px solid rgb(var(--p-edge)/.4);border-radius:7px 7px 0 0}.osi-layer[open] .osi-layer-icon{stroke:var(--accent)}.osi-layer[open] .osi-layer-toggle:after{display:none}
.osi-layer-content{display:block;padding:20px 23px 24px;min-width:0}
.osi-concept-card{min-width:0}.osi-concept-card+.osi-concept-card{border-top:1px solid rgb(var(--p-edge)/.35);padding-top:18px;margin-top:18px}
.note-sheet .osi-concept-card h3{font:500 10px/1.7 var(--mono);letter-spacing:.04em;text-transform:uppercase;color:var(--accent);margin:0 0 13px}
.osi-concept-card dl{margin:0}.osi-concept-card dl>div+div{margin-top:12px}
.osi-concept-card dt{font:600 13px/1.6 var(--sans);color:var(--fg)}
.osi-concept-card dd{font:13px/1.75 var(--sans);color:rgb(var(--p-muted));margin:2px 0 0}
.note-sheet .osi-concept-card p{font:13px/1.85 var(--sans);color:rgb(var(--p-muted));margin:0}
.note-sheet .osi-map-note{font:12px/1.8 var(--sans);color:rgb(var(--p-muted));margin:16px 0 24px}
.note-sheet .osi-hover-hint{font:11px/1.8 var(--mono);color:rgb(var(--p-muted));margin:0 0 19px}
.osi-item-list{display:flex;flex-wrap:wrap;gap:9px}.osi-item{display:inline-block;max-width:100%}
.osi-item-button{display:inline-flex;align-items:center;gap:12px;max-width:100%;min-height:42px;padding:9px 12px;border:1px solid rgb(var(--p-edge)/.65);border-radius:5px;background:rgb(var(--p-base)/.6);color:var(--fg);font:500 12px/1.65 var(--mono);text-align:left;cursor:pointer}
.osi-item-button>span{display:inline-grid;place-items:center;border:1px solid rgb(var(--p-edge)/.7);border-radius:50%;width:14px;height:14px;flex:0 0 14px;font:9px/1 var(--mono);color:rgb(var(--p-muted))}
.osi-item-button:hover,.osi-item-button[aria-expanded=true]{color:var(--fg);border-color:var(--accent);background:rgb(var(--p-accent)/.12)}
.osi-item-button[aria-expanded=true]>span{border-color:var(--accent);color:var(--accent)}
.osi-item-button:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.osi-tooltip{display:none;position:fixed;inset:auto;margin:0;width:min(350px,calc(100vw - 24px));height:auto;max-width:none;box-sizing:border-box;padding:20px;border:1px solid rgb(var(--p-accent)/.65);border-radius:9px;background:rgb(var(--p-panel));color:var(--fg);box-shadow:0 16px 55px #0007;overflow:auto;text-align:left;z-index:300;white-space:normal}
.osi-tooltip:popover-open{display:block}.osi-tooltip[hidden]{display:none!important}.osi-tooltip::backdrop{background:none;pointer-events:none}
.osi-tooltip[data-fallback-open=true]{display:block;position:static;width:100%;max-width:350px;margin:10px 0}
.osi-tooltip .osi-tooltip-title{display:block;font:600 17px/1.4 var(--sans);color:rgb(var(--p-ink));margin-bottom:14px}
.osi-tooltip-label{display:block;font:500 9px/1.7 var(--mono);letter-spacing:.06em;color:var(--accent);margin:12px 0 5px}
.osi-tooltip-copy{display:block;font:13px/1.8 var(--sans);color:rgb(var(--p-ink))}
.osi-tooltip-ports{display:block;border-top:1px solid rgb(var(--p-edge)/.5);padding-top:12px;margin-top:15px;font:11px/1.8 var(--mono);color:rgb(var(--p-muted))}
.note-sheet .osi-interview-line{border-left:2px solid var(--accent);padding:11px 14px;margin:22px 0 0;background:rgb(var(--p-accent)/.05);font:13px/1.85 var(--sans);color:rgb(var(--p-muted))}
.osi-sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
@container(max-width:700px){.osi-layer-label{grid-template-columns:1fr;gap:2px}.osi-layer>summary{gap:12px;padding:10px 15px}.osi-layer-label strong{font-size:14px}}
@container(max-width:440px){.osi-map{padding-left:16px}.osi-map:before{left:1px}.osi-layer:before{left:-19px}.osi-layer>summary{grid-template-columns:23px 24px minmax(0,1fr) 12px;gap:9px;padding:11px 12px}.osi-layer-number{font-size:22px}.osi-layer-icon{width:24px;height:24px}.osi-layer-label>span{font-size:11px}.osi-layer-content{padding:18px}.osi-item-list{gap:8px}.osi-item-button{font-size:11px;gap:8px}.osi-map-guide{font-size:8px;letter-spacing:0;gap:8px}}
@media(forced-colors:active){.osi-layer[open]{border:2px solid Highlight}.osi-layer-icon{stroke:CanvasText}.osi-layer-toggle:before,.osi-layer-toggle:after{background:CanvasText}}

/* Protocol studies: compact predictions with native, keyboard-accessible reveals. */
.protocol-layer{display:flex;align-items:flex-start;gap:19px;padding:20px 23px;margin:25px 0;border:1px solid rgb(var(--p-edge)/.55);border-left:2px solid var(--accent);border-radius:5px;background:linear-gradient(110deg,rgb(var(--p-accent)/.07),transparent)}
.protocol-layer-number{flex:0 0 30px;font:400 42px/1 var(--display);color:var(--accent)}
.protocol-layer strong{font:500 11px/1.7 var(--mono);color:var(--accent)}
.note-sheet .protocol-layer p{font:13px/1.8 var(--sans);margin:5px 0 0;color:rgb(var(--p-muted))}
.note-sheet .protocol-ports{width:100%;margin:0;font-size:13px}
.protocol-ports caption{text-align:left;padding:0 0 12px;font:500 10px/1.7 var(--mono);color:var(--accent);letter-spacing:.04em;text-transform:uppercase}
.protocol-ports th[scope=row]{font:500 12px/1.8 var(--mono);color:var(--fg);text-transform:none;letter-spacing:0}
.note-sheet .protocol-caption{font:12px/1.8 var(--sans);color:rgb(var(--p-muted));margin:12px 0 28px}
.protocol-lab{margin:34px 0;border:1px solid rgb(var(--p-edge)/.6);border-radius:10px;background:linear-gradient(135deg,rgb(var(--p-accent)/.045),transparent 55%),rgb(var(--p-base)/.35);overflow:hidden}
.protocol-lab-heading{padding:25px 25px 20px}
.protocol-lab .eyebrow{font:500 9px/1.8 var(--mono);letter-spacing:.08em;color:var(--accent)}
.note-sheet .protocol-lab h2{font:400 23px/1.3 var(--display);margin:9px 0 12px;color:var(--fg)}
.note-sheet .protocol-lab-heading p{font:13px/1.8 var(--sans);color:rgb(var(--p-muted));margin:0}
.protocol-case{border-top:1px solid rgb(var(--p-edge)/.45)}
.protocol-case>summary{display:grid;grid-template-columns:26px minmax(0,1fr) 15px;gap:14px;align-items:center;list-style:none;cursor:pointer;padding:19px 25px;min-height:68px;box-sizing:border-box}
.protocol-case>summary::-webkit-details-marker{display:none}
.protocol-case>summary:hover{background:rgb(var(--p-accent)/.065)}
.protocol-case>summary:focus-visible,.osi-study-links>summary:focus-visible{outline:2px solid var(--accent);outline-offset:-4px;border-radius:4px}
.protocol-case-number{font:11px/1.5 var(--mono);color:var(--accent);align-self:start;padding-top:3px}
.protocol-case>summary strong{display:block;font:600 14px/1.6 var(--sans);color:var(--fg)}
.protocol-case>summary>span>span{display:block;font:12px/1.8 var(--sans);color:rgb(var(--p-muted));margin-top:3px}
.protocol-case-toggle{font:20px/1 var(--mono);color:var(--accent);text-align:center}
.protocol-case[open]>summary{background:rgb(var(--p-accent)/.055)}
.protocol-case[open] .protocol-case-toggle{transform:rotate(45deg)}
.protocol-case-body{padding:4px 25px 24px}
.note-sheet .protocol-path{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;list-style:none;padding:0;margin:13px 0 22px;counter-reset:none}
.note-sheet .protocol-path>li{position:relative;min-width:0;margin:0;padding:15px 14px 17px;border:1px solid rgb(var(--p-edge)/.55);border-radius:5px;background:rgb(var(--p-panel)/.65);font:12px/1.8 var(--sans);color:rgb(var(--p-muted))}
.protocol-path>li+li:before{content:'→';position:absolute;left:-16px;top:50%;transform:translateY(-50%);font:13px/1 var(--mono);color:var(--accent)}
.protocol-path .protocol-step{display:block;font:10px/1.7 var(--mono);color:var(--accent);margin-bottom:12px}
.protocol-path strong{display:block;color:var(--fg);font:600 13px/1.6 var(--sans);margin:0 0 6px}
.protocol-path>li>span:last-child{display:block}
.note-sheet .protocol-case-body p{font:13px/1.9 var(--sans);color:rgb(var(--p-muted));margin:13px 0 0}
.note-sheet .protocol-outcome{border-left:2px solid var(--accent);padding:4px 0 4px 15px}
.protocol-outcome>strong{display:block;font:500 10px/1.8 var(--mono);text-transform:uppercase;letter-spacing:.035em;color:var(--accent);margin-bottom:6px}
.osi-study-links{margin-top:19px;border-top:1px solid rgb(var(--p-edge)/.4);padding-top:8px}
.osi-study-links>summary{font:12px/1.8 var(--mono);color:var(--accent);padding:12px 5px;cursor:pointer}
.osi-study-links nav{display:flex;flex-wrap:wrap;gap:8px;padding:4px 0 8px}
.note-sheet .osi-study-links a{padding:9px 12px;border:1px solid rgb(var(--p-edge)/.5);border-radius:4px;font:12px/1.7 var(--mono);color:var(--fg);text-decoration:none;background:rgb(var(--p-base)/.5)}
.note-sheet .osi-study-links a:hover{border-color:var(--accent);color:var(--accent)}
.osi-study-links a:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
@container(max-width:560px){.note-sheet .protocol-path{grid-template-columns:1fr;gap:17px}.protocol-path>li+li:before{content:'↓';left:20px;top:-10px;transform:translateY(-50%)}.protocol-path .protocol-step{margin-bottom:5px}.protocol-lab-heading{padding:22px 18px 18px}.protocol-case>summary{padding:17px 18px;gap:10px}.protocol-case-body{padding:3px 18px 20px}.protocol-layer{padding:18px;gap:12px}.note-sheet .protocol-ports th,.note-sheet .protocol-ports td{padding:12px 10px}}
@media(forced-colors:active){.protocol-layer,.protocol-lab,.protocol-case,.protocol-path>li{border-color:CanvasText}.protocol-case[open]>summary{border-bottom:1px solid Highlight}.protocol-outcome{border-color:Highlight}}

/* RMF: a small preparation card and six expandable CSIAAM steps. */
.rmf-prepare{margin:25px 0;padding:20px 24px;border:1px solid rgb(var(--p-edge)/.6);border-left:2px solid var(--accent);border-radius:7px;background:linear-gradient(110deg,rgb(var(--p-accent)/.07),transparent)}
.rmf-prepare .eyebrow{font:500 9px/1.8 var(--mono);letter-spacing:.07em;color:var(--accent)}
.note-sheet .rmf-prepare h2{font:400 22px/1.3 var(--display);margin:8px 0}
.note-sheet .rmf-prepare p{font:13px/1.85 var(--sans);margin:8px 0 0}
.rmf-cycle .rmf-step>summary{grid-template-columns:38px minmax(0,1fr) 15px}
.rmf-letter{display:grid;place-items:center;width:34px;height:38px;font:500 29px/1 var(--mono);color:var(--accent)}
.rmf-step[open] .rmf-letter{background:rgb(var(--p-accent)/.12);border-radius:5px}
.rmf-example{padding:15px 17px;margin:17px 0;background:rgb(var(--p-panel)/.7);border:1px solid rgb(var(--p-edge)/.45);border-radius:6px}
.note-sheet .rmf-example p{margin-top:7px}
.note-sheet .rmf-loop{display:flex;gap:12px;align-items:flex-start;border-top:1px solid rgb(var(--p-edge)/.45);padding:18px 25px;margin:0;font:12px/1.8 var(--sans);color:rgb(var(--p-muted))}
.rmf-loop>span{font:24px/1 var(--mono);color:var(--accent)}
.rmf-controls{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:25px 0 15px}
.rmf-controls>div{min-width:0;padding:18px;border:1px solid rgb(var(--p-edge)/.55);border-radius:7px;background:rgb(var(--p-base)/.35)}
.rmf-controls .eyebrow{font:500 9px/1.7 var(--mono);letter-spacing:.025em;color:var(--accent)}
.note-sheet .rmf-controls h3{font:500 16px/1.5 var(--sans);color:var(--fg);margin:11px 0 9px}
.note-sheet .rmf-controls p{font:13px/1.8 var(--sans);margin:0;color:rgb(var(--p-muted))}
@container(max-width:620px){.rmf-controls{grid-template-columns:1fr}.rmf-prepare{padding:18px}.note-sheet .rmf-loop{padding:17px 18px}.rmf-controls>div{padding:16px 18px}}
@media(forced-colors:active){.rmf-prepare,.rmf-example,.rmf-controls>div{border-color:CanvasText}}

@keyframes study-reveal{from{opacity:.3;transform:translateY(6px)}to{opacity:1;transform:none}}
@media(max-width:760px){
  .kb-article .container{width:calc(100% - 36px)}
  .kb-article .principle-box{padding:22px}
  .kb-article .toc ol{columns:1}
  .study-body>h2{font-size:1.3rem;gap:12px}
  .exercise-heading,.exercise-mount{padding:22px 18px}
  .exercise-heading h2{font-size:1.3rem!important}
  .exercise-controls{gap:18px}
  .bit-strip{grid-template-columns:1fr 1fr;gap:20px}
  .metric-grid strong{font-size:1rem}
  .metric-grid>div{padding:16px}
  .log-row{grid-template-columns:1fr auto;gap:10px}
  .log-row>div{grid-column:1/-1;grid-row:2}
  .delivery-state{text-align:right}
  .response-track{grid-template-columns:1fr 1fr}
  .access-signals{grid-template-columns:1fr;gap:3px}
  .study-body th,.study-body td{padding:15px}
}
@media(max-width:420px){
  .metric-grid{grid-template-columns:1fr}
  .exercise-controls>label{min-width:0;flex-basis:100%}
  .collector-count{text-align:left}
  .exercise-actions button{width:100%}
  .dora-track{gap:4px}.dora-track strong{font-size:.75rem}
  .message-flight{gap:8px}.flight-arrow{letter-spacing:0}
  .retrieval-check{padding:22px}
}
@media(prefers-reduced-motion:reduce){.exercise *{animation:none!important;transition:none!important}}
@media print{
  .exercise{display:none!important}
  .kb-article .container{width:100%}
  .study-body p,.study-body li{font-size:11pt}
  .study-body table{font-size:10pt}
  .study-body>h2{break-after:avoid}
}