:root{--navy:#023347;--ink:#17262d;--muted:#566570;--teal:#087985;--mist:#e8f7f7;--line:#cbdfe2;--paper:#f7fafa;--gold:#a67312;--warn:#9d3027}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:78px}
body{margin:0;background:var(--paper);color:var(--ink);font:1rem/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;overflow-wrap:break-word}
button,input,select{font:inherit}
button,a,input,select{touch-action:manipulation}
button{cursor:pointer;min-height:44px}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
a{color:var(--navy)}
input[type=range]{accent-color:var(--teal);width:100%;min-width:0;height:44px;cursor:pointer}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92em;background:#eef4f5;border-radius:4px;padding:2px 6px;color:var(--navy)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;top:-80px}
.skip:focus{top:8px;background:#fff;z-index:20;padding:12px}
[hidden]{display:none!important}

.shell{max-width:620px;margin:auto}
.masthead{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:20px 22px 14px}
.masthead img{width:132px;height:auto}
.masthead span{font-size:.7rem;letter-spacing:.14em;color:var(--teal);font-weight:650}
.section-nav{position:sticky;top:0;z-index:5;background:#f7fafaf2;backdrop-filter:blur(6px);border-block:1px solid var(--line);padding:8px 22px;display:flex;align-items:center;gap:12px}
.section-nav select{flex:1;min-width:0;font-size:.875rem;min-height:42px;padding:8px;background:#fff;border:1px solid var(--line);border-radius:8px;color:var(--navy);font-weight:600}
.notes-toggle{display:flex;align-items:center;gap:6px;font-size:.8125rem;color:var(--muted);white-space:nowrap;cursor:pointer}
.notes-toggle input{accent-color:var(--teal);width:17px;height:17px}

section{padding:30px 22px 38px;border-bottom:1px solid var(--line)}
.eyebrow{display:flex;align-items:center;gap:9px;font-size:.6875rem;font-weight:700;letter-spacing:.13em;color:var(--teal);margin:0 0 14px}
.eyebrow b{display:grid;place-items:center;flex-shrink:0;width:27px;height:27px;border:1px solid var(--line);border-radius:50%;letter-spacing:0}
h1,h2{color:var(--navy);font-size:1.875rem;line-height:1.1;font-weight:650;letter-spacing:-.04em;margin:0 0 20px}
.micro{font-size:.6875rem;letter-spacing:.06em;color:#8fa0a6;margin:16px 0 0;text-transform:uppercase}
.pnote{border-left:3px solid var(--gold);background:#fdf9ef;padding:11px 14px;border-radius:0 8px 8px 0;font-size:.9375rem;color:#6b4d16;margin:18px 0 0}
.controls{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.primary-button{border:1px solid var(--teal);background:var(--teal);color:#fff;border-radius:9px;padding:11px 18px;font-size:.9375rem;font-weight:650}
.primary-button:hover{background:#066a75}
.primary-button[disabled]{opacity:.5;cursor:default}
.step-caption{min-height:2.6em;margin:0 0 16px;font-size:1.0625rem;line-height:1.3;color:var(--navy);font-weight:600;letter-spacing:-.015em}
.step-caption:empty::before{content:"\00a0"}
.choices{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:18px}
.choices button{border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--navy);padding:9px 13px;font-size:.875rem;flex:1 1 auto;font-weight:600}
.choices [aria-pressed=true]{border-color:var(--teal);background:var(--mist);box-shadow:inset 0 -2px var(--teal)}
.figure{margin:0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 16px}
.figure-takeaway{border-top:1px solid var(--line);padding-top:13px;color:var(--teal);font-size:.8125rem;font-weight:650;margin:14px 0 0;letter-spacing:.02em;text-transform:uppercase}
.range-row{display:flex;align-items:center;gap:14px;margin-bottom:12px}
.range-row output{font-weight:700;color:var(--navy);min-width:2.2em;text-align:right;font-size:1.5rem;font-variant-numeric:tabular-nums;letter-spacing:-.04em}

/* ---- 01 layer stack ---- */
.stack{display:grid;gap:0}
.layer{display:grid;gap:4px;width:100%;text-align:left;position:relative;background:#fff;border:1px solid var(--line);border-radius:11px;padding:13px 14px 13px 18px;color:var(--ink);overflow:hidden;transition:background .2s,border-color .2s,box-shadow .2s}
.layer-rail{position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--line)}
.layer.is-core{border-color:var(--teal);border-width:2px}
.layer.is-core .layer-rail{background:var(--teal)}
.layer-head{display:flex;align-items:baseline;justify-content:space-between;gap:9px}
.layer-name{color:var(--navy);font-size:1.0625rem;font-weight:650;letter-spacing:-.02em}
.layer-tag{font-size:.6875rem;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);font-weight:650;text-align:right}
.layer.is-core .layer-tag{color:#77520b}
.layer-chips{display:flex;gap:5px;flex-wrap:wrap}
.layer-chips span{font-size:.75rem;background:#eef4f5;color:var(--muted);border-radius:5px;padding:3px 7px}
.layer.is-lit{border-color:var(--teal);background:var(--mist);box-shadow:0 0 0 4px #0879851f}
.layer.is-lit .layer-rail{background:var(--teal)}
.layer.is-lit .layer-chips span{background:#fff;color:var(--navy)}
.layer.is-answer{border-color:var(--gold);background:#fdf7e9;box-shadow:0 0 0 4px #a6731222}
.layer.is-answer .layer-rail{background:var(--gold)}
.flow-mark{display:flex;justify-content:center;gap:30px;padding:5px 0;color:#b9d0d4;font-size:1rem;line-height:1}
.flow-down.is-on{color:var(--teal);font-weight:700;transform:scale(1.5)}
.flow-up.is-on{color:var(--gold);font-weight:700;transform:scale(1.5)}
.boundary{border:1px dashed #c08a4e;background:#fdf3e9;border-radius:9px;padding:10px 14px;margin:9px 0;text-align:center;font-size:.875rem;color:#7d4a18;font-weight:650;letter-spacing:-.01em}
.boundary.is-lit{background:#f8dcc0;border-color:#9a5a20;box-shadow:0 0 0 4px #b5773a22}
.spine{border:1px dashed var(--line);border-radius:9px;padding:9px 14px;margin-top:9px;text-align:center;font-size:.75rem;color:var(--muted);letter-spacing:.02em}

/* ---- 02 networks ---- */
.net-pair{display:grid;gap:12px}
@media(min-width:480px){.net-pair{grid-template-columns:1fr 1fr}}
.net-card{margin:0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:13px 10px 6px}
.net-card.is-good{border-color:#9dcdd1;background:var(--mist)}
.net-card figcaption{display:flex;align-items:baseline;justify-content:space-between;gap:8px;padding:0 4px 6px}
.net-title{font-size:.6875rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:650}
.net-card figcaption strong{font-size:1.875rem;line-height:1;color:var(--navy);font-variant-numeric:tabular-nums;letter-spacing:-.05em}
.net-card.is-good figcaption strong{color:var(--teal)}
#net-direct-card.is-heavy figcaption strong{color:var(--warn)}
.net-pair svg{width:100%;height:auto;display:block}
.net-line{stroke:#b9d0d4;stroke-width:.7;opacity:.75}
#net-direct-card.is-heavy .net-line{stroke:#d98b7e;opacity:.55}
.net-line-hub{stroke:var(--teal);stroke-width:.9;opacity:.5}
.net-src{fill:#7fa8b0}
.net-use{fill:var(--navy)}
.net-hub{fill:var(--teal)}
.legend{display:flex;align-items:center;gap:6px;flex-wrap:wrap;font-size:.75rem;color:var(--muted);margin:14px 0 0}
.key{width:9px;height:9px;border-radius:50%;display:inline-block;margin-left:10px}
.key:first-child{margin-left:0}
.k-src{background:#7fa8b0}.k-use{background:var(--navy)}.k-hub{background:var(--teal)}

/* ---- 03 systems ---- */
.sys-field{display:grid;grid-template-columns:repeat(auto-fill,minmax(88px,1fr));gap:7px}
.sys-tile{border:1px solid var(--line);background:#fff;border-radius:9px;padding:10px 8px;font-size:.75rem;line-height:1.25;color:var(--navy);text-align:center;font-weight:600;min-height:52px;display:grid;place-items:center;transition:transform .3s,border-color .3s,background .3s}
.sys-field.is-linked .sys-tile{border-color:#9dcdd1;background:var(--mist);transform:translateY(-3px)}
.sys-bar{margin-top:10px;border:2px solid var(--teal);background:var(--teal);color:#fff;border-radius:10px;padding:13px;text-align:center;font-size:.8125rem;font-weight:700;letter-spacing:.09em;position:relative}
.sys-bar::before{content:"";position:absolute;top:-10px;left:0;right:0;height:10px;background:repeating-linear-gradient(90deg,var(--teal) 0 2px,transparent 2px 7%)}
.sys-caption{margin:14px 0 0;font-size:.9375rem;color:var(--muted);font-weight:600}

/* ---- dot grids ---- */
.dotgrid{display:grid;grid-template-columns:repeat(40,1fr);gap:2px;margin:16px 0 0}
.dotgrid.is-rls{grid-template-columns:repeat(40,1fr)}
.dotgrid span{aspect-ratio:1;border-radius:1px;background:var(--teal);transition:background .35s,opacity .35s}
.dotgrid span.d-off{background:#dfe7e9}
.dotgrid span.d-grey{background:#a8b7bc}
.dotgrid span.d-hollow{background:#dfe7e9;box-shadow:inset 0 0 0 1px #a8b7bc}
.dotgrid span.d-gold{background:var(--gold)}
.count-figure{padding-bottom:16px}
.count-head{display:flex;align-items:center;justify-content:space-between;gap:10px}
.count-side{flex:1;min-width:0}
.count-side strong{display:block;font-size:2.25rem;line-height:1;color:var(--muted);font-variant-numeric:tabular-nums;letter-spacing:-.05em}
.count-side.is-right strong{color:var(--teal)}
.count-side span{display:block;font-size:.75rem;color:var(--muted);margin-top:4px;line-height:1.25}
.count-arrow{color:#b9d0d4;font-size:1.5rem;flex:none}
.dot-legend{display:flex;gap:12px;flex-wrap:wrap;font-size:.75rem;color:var(--muted);margin-top:12px}
.dot-legend i{width:9px;height:9px;border-radius:2px;display:inline-block;margin-right:5px;vertical-align:-1px}
.rel-line{margin:18px 0 0;font-size:.9375rem;line-height:1.6;color:var(--navy)}
.rls-head{display:flex;align-items:baseline;gap:10px}
.rls-head strong{font-size:2.5rem;line-height:1;color:var(--navy);font-variant-numeric:tabular-nums;letter-spacing:-.05em}
.rls-head span{font-size:.8125rem;color:var(--muted)}

/* ---- 05 questions ---- */
.qcard{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;margin-bottom:11px}
.qcard-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:9px}
.qcard-step{font-size:.6875rem;letter-spacing:.08em;font-weight:700;color:var(--teal)}
.qcard-q{font-size:1rem;line-height:1.4;color:var(--navy);margin:0}
.qcard-expect{display:inline-block;margin:11px 0 0;background:var(--mist);color:var(--teal);border-radius:7px;padding:6px 11px;font-size:.875rem;font-weight:700}
.copy{background:transparent;border:1px solid var(--line);border-radius:7px;color:var(--muted);font-size:.6875rem;letter-spacing:.06em;text-transform:uppercase;font-weight:700;padding:7px 11px;min-height:36px;flex:none}
.copy:hover{color:var(--teal);border-color:var(--teal)}
.copy[data-done]{color:#fff;background:var(--teal);border-color:var(--teal)}

/* ---- 06/07 ---- */
.chip-row{display:flex;gap:6px;flex-wrap:wrap;margin-top:16px}
.gchip{font-size:.75rem;background:#fff;border:1px solid var(--line);color:var(--navy);border-radius:6px;padding:6px 10px;font-weight:600}
.pipeline{display:grid;margin-bottom:20px}
.pipe-node{border:1px solid var(--line);border-radius:11px;padding:12px 14px;background:#fff;text-align:center}
.pipe-node.is-core{border-color:var(--teal);border-width:2px;background:var(--mist)}
.pipe-label{display:block;font-size:.6875rem;letter-spacing:.08em;font-weight:700;color:var(--teal);margin-bottom:4px}
.pipe-node strong{display:block;color:var(--navy);font-size:1.0625rem;letter-spacing:-.02em}
.pipe-arrow{text-align:center;color:var(--teal);font-size:1.25rem;line-height:1;padding:7px}
.pipe-split{display:grid;gap:10px}
@media(min-width:460px){.pipe-split{grid-template-columns:1fr 1fr}}
.closing-question{font-size:1.375rem;line-height:1.25;color:var(--navy);font-weight:600;letter-spacing:-.03em;margin:26px 0 0}
.closing{padding:20px 22px;font-size:.875rem;display:flex;flex-wrap:wrap;gap:18px;justify-content:space-between}

@media(min-width:900px){.shell{margin:20px auto;border:1px solid var(--line);border-radius:16px;overflow:clip}section{padding:36px 30px 44px}.masthead,.section-nav{padding-inline:30px}.closing{padding-inline:30px}h1,h2{font-size:2.25rem}}
@media(max-width:360px){section{padding-inline:15px}.masthead,.section-nav{padding-inline:15px}h1,h2{font-size:1.625rem}.dotgrid{grid-template-columns:repeat(30,1fr)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}.flow-down.is-on,.flow-up.is-on{transform:none}}

/* ---- 04 routing: who answers ---- */
.mini-head{font-size:.6875rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:700;margin:26px 0 12px}
.paths{display:grid;gap:14px;margin-bottom:6px}
@media(min-width:620px){.paths{grid-template-columns:1fr 1fr;align-items:start}}
.path{border:1px solid var(--line);border-radius:14px;background:#fff;padding:14px 13px 13px}
.path.is-good{border-color:#9dcdd1;background:var(--mist)}
.path-head{display:flex;align-items:baseline;justify-content:space-between;gap:9px;margin-bottom:12px}
.path-label{font-size:.6875rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:700}
.path.is-good .path-label{color:var(--teal)}
.path-answer{font-size:1.625rem;line-height:1;color:var(--muted);font-variant-numeric:tabular-nums;letter-spacing:-.05em}
.path.is-good .path-answer{color:var(--teal)}
.pnode{position:relative;border:1px solid var(--line);border-radius:9px;background:#fff;padding:9px 30px 9px 11px;display:grid;gap:2px;transition:border-color .2s,box-shadow .2s,background .2s}
.pnode.is-ask{background:#eef4f5;border-style:dashed}
.pnode.is-iq{border-color:var(--teal);border-width:2px}
.pnode.is-join{border-color:#9dcdd1}
.pn-name{font-size:.8125rem;line-height:1.3;color:var(--navy);font-weight:650}
.pn-sub{font-size:.6875rem;line-height:1.3;color:var(--muted);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.pn-sub:empty{display:none}
.pmsg{position:absolute;right:7px;top:50%;transform:translateY(-50%) scale(.6);opacity:0;font-size:.9375rem;transition:opacity .2s,transform .2s}
.pnode.is-on{border-color:var(--teal);box-shadow:0 0 0 3px #0879851f;background:#fff}
.pnode.is-on .pmsg{opacity:1;transform:translateY(-50%) scale(1)}
.pnode.is-done{border-color:#9dcdd1}
.psplit{display:grid;gap:7px}
@media(min-width:400px){.psplit{grid-template-columns:1fr 1fr}}
.pwire{text-align:center;color:#b9d0d4;font-size:1rem;line-height:1;padding:5px 0;transition:color .2s,transform .2s}
.pwire.is-on{color:var(--teal);transform:scale(1.6)}
.pwire.is-back.is-on{color:var(--gold)}
.pout{margin-top:2px;border-radius:9px;background:#eef4f5;padding:9px 11px;display:flex;align-items:baseline;gap:8px;transition:background .2s,box-shadow .2s}
.path.is-good .pout{background:#d9f0f0}
.pout.is-on{box-shadow:0 0 0 3px #a6731233}
.pout strong{font-size:1.5rem;line-height:1;color:var(--navy);font-variant-numeric:tabular-nums;letter-spacing:-.05em}
.path.is-good .pout strong{color:var(--teal)}
.pout span{font-size:.75rem;color:var(--muted)}
.path-verdict{margin:11px 0 0;font-size:.8125rem;line-height:1.4;color:var(--muted)}
@media(prefers-reduced-motion:reduce){.pwire.is-on{transform:none}.pmsg{transition:none}}

/* ---- 05 open the agent ---- */
.agent-open { margin: 0 0 16px; }
.agent-open #agent-link {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 10px 16px; border: 1px solid var(--teal); border-radius: 9px;
  background: var(--teal); color: #fff; font-size: .9375rem; font-weight: 650; text-decoration: none;
}
.agent-open #agent-link::after { content: "→"; }
.agent-open #agent-link:hover { background: #066a75; border-color: #066a75; }
.qcard-step:empty { display: none; }
.qcard-top:has(.qcard-step:empty) { justify-content: flex-end; }
.qcard-expect:empty { display: none; }
.agent-open{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.agent-thread{display:inline-flex;align-items:center;gap:8px;padding:10px 15px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--navy);font-size:.875rem;font-weight:650;text-decoration:none}
.agent-thread::before{content:"\21BA";color:var(--teal);font-weight:700}
.agent-thread:hover{border-color:var(--teal);color:var(--teal)}

/* ---- 06 agent blocks ---- */
.agent-block { border: 1px solid var(--line); border-radius: 14px; background: #fff; padding: 18px 16px; margin-bottom: 14px; }
.agent-block h3 { margin: 0 0 12px; color: var(--navy); font-size: 1.125rem; letter-spacing: -.025em; }
.agent-block .agent-open { margin: 0 0 14px; }
.agent-block .qcard { border-color: #e2edee; background: var(--paper); }
.agent-block .qcard:last-child { margin-bottom: 0; }
.agent-primary {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 10px 16px; border: 1px solid var(--teal); border-radius: 9px;
  background: var(--teal); color: #fff; font-size: .9375rem; font-weight: 650; text-decoration: none;
}
.agent-primary::after { content: "→"; }
.agent-primary:hover { background: #066a75; border-color: #066a75; }
.agent-block .qcard { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.agent-block .qcard-q { flex: 1; min-width: 0; margin: 0; }
.agent-block .qcard-top { order: 2; margin: 0; flex: none; }