/* System architecture showcase (2026-11-08): four interactive, animated slides
   that show how voice-to-agent binding, the dual-plane event bus, live canvas
   artifacts + screen-only presenter seats, and 90-minute takt release trains
   fit together without exposing internal credentials or private schemas.
   Uses the locked Cobalt tokens (--ink, --paper, --soft, --accent, --rule). */

.arch{background:var(--soft);border-bottom:1px solid var(--rule);
  padding:clamp(44px,6vw,76px) 24px clamp(38px,5vw,64px)}
.arch-in{max-width:1080px;margin:0 auto}
.arch-head{text-align:center;margin:0 0 24px}
.arch-head .sh-kicker{color:var(--accent);margin-bottom:10px}
.arch-head h2{font-family:var(--display);font-weight:600;color:var(--ink);
  font-size:clamp(26px,3.4vw,40px);line-height:1.1;letter-spacing:-.02em;
  margin:0 auto;max-width:26ch;text-wrap:balance}
.arch-head .arch-lede{margin:12px auto 0;max-width:64ch;font:16px/1.6 var(--ui);color:#474747}

/* Interactive layer tabs above the slide stage */
.arch-tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;
  margin:0 0 18px;padding:0;list-style:none}
.arch-tabs[hidden]{display:none}
.arch-tab{appearance:none;width:100%;min-height:48px;padding:10px 14px;
  border:1px solid var(--rule);border-top:3px solid var(--tc,#0A66C2);border-radius:12px;
  background:var(--paper);color:var(--ink);cursor:pointer;text-align:left;
  display:flex;flex-direction:column;gap:2px;
  transition:border-color .2s ease,box-shadow .2s ease,background-color .2s ease}
.arch-tab[data-target="binding"]{--tc:#0A66C2}
.arch-tab[data-target="bus"]{--tc:#7C5CFF}
.arch-tab[data-target="artifacts"]{--tc:#E07A2E}
.arch-tab[data-target="takt"]{--tc:#1F9D74}
.arch-tab-num{font:600 11px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing:.08em;text-transform:uppercase;color:#555}
.arch-tab-label{font:600 14px/1.25 var(--ui);color:var(--ink)}
.arch-tab:hover{border-color:var(--tc,#0A66C2)}
.arch-tab:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.arch-tab[aria-selected="true"]{background:#fff;border-color:var(--tc,#0A66C2);
  box-shadow:0 6px 20px -12px rgba(25,25,25,.28)}
.arch-tab[aria-selected="true"] .arch-tab-num{color:var(--tc,#0A66C2)}

/* Stage stacks all four slides in one grid cell when JS runs; stacks vertically without JS */
.arch-stage{display:grid;gap:18px}
.arch.is-ready .arch-stage{gap:0}
.arch-slide{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,1fr);
  gap:clamp(20px,3.8vw,44px);align-items:center;
  background:var(--paper);border:1px solid var(--rule);border-radius:18px;
  padding:clamp(22px,3.4vw,36px) clamp(20px,3.4vw,40px);
  box-shadow:0 1px 2px rgba(25,25,25,.04),0 14px 34px -24px rgba(25,25,25,.25);
  opacity:1;visibility:visible;transition:opacity .42s ease,visibility .42s ease}
.arch.is-ready .arch-slide{grid-area:1/1}
.arch-slide[aria-hidden="true"]{opacity:0;visibility:hidden;pointer-events:none}
.arch-art{min-width:0;background:var(--soft);border:1px solid var(--rule);border-radius:14px;padding:12px}
.arch-art svg{display:block;width:100%;height:auto;max-width:500px;margin:0 auto}
.arch-copy{min-width:0;text-align:left}
.arch-num{margin:0 0 8px;font:600 12px/1.3 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing:.1em;text-transform:uppercase;color:var(--ac,#0A66C2)}
.arch-slide[data-arch="binding"]{--ac:#0A66C2}
.arch-slide[data-arch="bus"]{--ac:#5B3FD9}
.arch-slide[data-arch="artifacts"]{--ac:#B85614}
.arch-slide[data-arch="takt"]{--ac:#167958}
.arch-copy h3{margin:0 0 10px;font:600 clamp(20px,2.4vw,26px)/1.22 var(--display);
  color:var(--ink);letter-spacing:-.01em;text-wrap:balance}
.arch-copy > p{margin:0 0 14px;font:16px/1.62 var(--ui);color:#474747;max-width:54ch}

/* Sanitized telemetry / invariant pills inside each slide */
.arch-specs{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.arch-specs li{padding:6px 11px;border-radius:999px;background:var(--soft);
  border:1px solid var(--rule);font:500 13px/1.3 var(--ui);color:var(--ink)}
.arch-specs b{font:600 11.5px/1 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing:.04em;text-transform:uppercase;color:#474747;margin-right:5px}

/* Bottom controls: pause + dots (44x44 tap target) */
.arch-ctl{display:flex;align-items:center;justify-content:center;gap:4px;margin:14px 0 0;min-height:44px}
.arch-ctl[hidden]{display:none}
.arch-dot{flex:none;width:44px;height:44px;border:0;background:transparent;cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;border-radius:50%;padding:0}
.arch-dot::before{content:"";width:10px;height:10px;border-radius:50%;
  background:transparent;border:2px solid #767676;transition:background .2s ease,border-color .2s ease}
.arch-dot:hover::before{border-color:var(--ink)}
.arch-dot:focus-visible{outline:2px solid var(--accent);outline-offset:-6px}
.arch-dot[aria-current="true"]::before{background:var(--accent);border-color:var(--accent)}
.arch-pause{flex:none;min-width:44px;min-height:44px;border:0;background:transparent;cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;border-radius:50%;
  color:#595959;padding:0;margin-right:6px}
.arch-pause svg{width:18px;height:18px;fill:currentColor;display:block}
.arch-pause:hover,.arch-pause:focus-visible{color:var(--ink);background:var(--paper)}
.arch-pause:focus-visible{outline:2px solid var(--accent);outline-offset:-4px}

/* Keyframe animations for architecture blueprints */
.arch-a-wire{stroke-dasharray:6 6}
.arch-slide.is-on .arch-a-wire{animation:archWire 1.5s linear infinite}
@keyframes archWire{to{stroke-dashoffset:-24}}

.arch-a-ring{transform-origin:center;transform-box:fill-box}
.arch-slide.is-on .arch-a-ring{animation:archRing 2.4s ease-out infinite}
@keyframes archRing{0%{transform:scale(.75);opacity:.85}75%{transform:scale(1.22);opacity:0}100%{transform:scale(1.22);opacity:0}}

.arch-slide.is-on .arch-a-node1{animation:archNode 1s .1s ease-out both}
.arch-slide.is-on .arch-a-node2{animation:archNode 1s .28s ease-out both}
.arch-slide.is-on .arch-a-node3{animation:archNode 1s .46s ease-out both}
.arch-slide.is-on .arch-a-node4{animation:archNode 1s .64s ease-out both}
@keyframes archNode{from{opacity:.25;transform:translateY(5px)}to{opacity:1;transform:none}}

.arch-slide.is-on .arch-a-gate{animation:archGate 2.2s ease-in-out infinite}
@keyframes archGate{0%,100%{opacity:.78}50%{opacity:1}}

.arch-slide.is-on .arch-a-card{animation:archCard 1.1s .2s ease-out both}
@keyframes archCard{from{transform:translateX(-10px);opacity:.3}to{transform:none;opacity:1}}

.arch-slide.is-on .arch-a-train{animation:archTrain 2.8s ease-in-out infinite}
@keyframes archTrain{0%{transform:translateX(0)}50%{transform:translateX(10px)}100%{transform:translateX(0)}}

@media (max-width:860px){
  .arch-tabs{grid-template-columns:repeat(2,minmax(0,1fr))}
  .arch-slide{grid-template-columns:1fr;text-align:center}
  .arch-copy{text-align:center}
  .arch-copy > p{margin-left:auto;margin-right:auto}
  .arch-copy h3{margin-left:auto;margin-right:auto}
  .arch-specs{justify-content:center}
  .arch-art svg{max-width:400px}
}
@media (max-width:480px){
  .arch{padding-left:16px;padding-right:16px}
  .arch-tabs{grid-template-columns:1fr;gap:8px}
  .arch-slide{padding:18px 16px 20px}
  .arch-art{padding:8px}
  .arch-art svg{max-width:300px}
}

@media (prefers-reduced-motion:reduce){
  .arch-tab,.arch-slide,.arch-dot::before{transition:none}
  .arch-slide.is-on .arch-a-wire,.arch-slide.is-on .arch-a-ring,
  .arch-slide.is-on .arch-a-node1,.arch-slide.is-on .arch-a-node2,
  .arch-slide.is-on .arch-a-node3,.arch-slide.is-on .arch-a-node4,
  .arch-slide.is-on .arch-a-gate,.arch-slide.is-on .arch-a-card,
  .arch-slide.is-on .arch-a-train{animation:none}
}

/* ── AI Agent Model band (section#agent-model) ───────────────────────────── */
.am{
  background:var(--paper);
  border-bottom:1px solid var(--rule);
  padding:clamp(40px,5.5vw,72px) 24px clamp(36px,5vw,64px);
}
.am-in{max-width:1080px;margin:0 auto}
.am-head{text-align:center;margin:0 0 24px}
.am-head .sh-kicker{color:var(--accent);margin-bottom:10px}
.am h2{
  font-family:var(--display);font-weight:600;color:var(--ink);
  font-size:clamp(26px,3.6vw,42px);line-height:1.1;letter-spacing:-.02em;
  margin:0 auto;max-width:24ch;text-wrap:balance;
}
.am-lede{margin:12px auto 0;max-width:62ch;font:17px/1.6 var(--ui);color:#474747}

.am-flow{
  margin:0 0 22px;padding:18px 20px;border-radius:18px;
  background:var(--soft);border:1px solid var(--rule);
}
.am-flow svg{display:block;width:100%;max-width:860px;height:auto;margin:0 auto}
.am-wire{stroke-dasharray:6 5;animation:archWire 2.4s linear infinite}
.am-node{transition:transform .2s ease,filter .2s ease}
.am[data-active-seat="clay"] .am-seat-clay,
.am[data-active-seat="greg"] .am-seat-greg,
.am[data-active-seat="jemma"] .am-seat-jemma,
.am[data-active-seat="cody"] .am-seat-cody,
.am[data-active-seat="jev"] .am-seat-jev,
.am[data-active-seat="human"] .am-seat-human{
  filter:drop-shadow(0 4px 10px rgba(10,102,194,.26));
}

.am-grid{
  list-style:none;margin:0;padding:0;
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;
}
.am-card{
  position:relative;display:flex;flex-direction:column;min-width:0;
  background:#fff;border:1px solid var(--rule);border-top:4px solid var(--am-color,var(--accent));
  border-radius:16px;padding:20px 20px 18px;
  box-shadow:0 1px 2px rgba(25,25,25,.04),0 12px 28px -22px rgba(25,25,25,.25);
  transition:border-color .16s ease,box-shadow .16s ease,transform .16s ease;
}
.am-card[data-seat="clay"]{--am-color:#E07A2E}
.am-card[data-seat="greg"]{--am-color:#1F9D74}
.am-card[data-seat="jemma"]{--am-color:#7C5CFF}
.am-card[data-seat="cody"]{--am-color:#0A66C2}
.am-card[data-seat="jev"]{--am-color:#191919;background:var(--soft)}
.am-card[data-seat="human"]{--am-color:#0A66C2;background:var(--ink);border-color:var(--ink);color:#F2F2F2}
.am-card.is-focused{
  box-shadow:0 0 0 2px var(--accent),0 14px 32px -18px rgba(10,102,194,.28);
}

.am-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 0 8px}
.am-badge{
  display:inline-flex;align-items:center;justify-content:center;
  padding:4px 10px;border-radius:999px;background:var(--soft);border:1px solid var(--rule);
  font:600 11px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing:.08em;text-transform:uppercase;color:#474747;
}
.am-card[data-seat="jev"] .am-badge{background:#191919;border-color:#191919;color:#8FC7FF}
.am-card[data-seat="human"] .am-badge{background:#0A66C2;border-color:#0A66C2;color:#fff}

.am-card h3{
  margin:0 0 4px;font:600 22px/1.2 var(--display);color:var(--ink);letter-spacing:-.01em;
}
.am-card[data-seat="human"] h3{color:#fff}
.am-role{
  margin:0 0 10px;font:600 12px/1.35 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing:.06em;text-transform:uppercase;color:#474747;
}
.am-card[data-seat="human"] .am-role{color:#8FC7FF}
.am-desc{margin:0 0 14px;font:15.5px/1.55 var(--ui);color:#474747;flex:1 1 auto}
.am-card[data-seat="human"] .am-desc{color:#D3DCEA}
.am-meta{
  margin:0;padding:10px 12px;border-radius:10px;background:var(--soft);border:1px solid var(--rule);
  font:500 13px/1.4 var(--ui);color:#191919;
}
.am-card[data-seat="jev"] .am-meta{background:#fff}
.am-card[data-seat="human"] .am-meta{background:#262626;border-color:#3d3d3d;color:#F2F2F2}
.am-meta b{
  display:block;margin-bottom:2px;
  font:700 10.5px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing:.08em;text-transform:uppercase;color:#0A66C2;
}
.am-card[data-seat="human"] .am-meta b{color:#8FC7FF}

@media (max-width:860px){
  .am-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:560px){
  .am{padding-left:16px;padding-right:16px}
  .am-flow{padding:12px}
  .am-grid{grid-template-columns:1fr;gap:12px}
}
@media (prefers-reduced-motion:reduce){
  .am-wire,.am-node,.am-card{animation:none;transition:none}
}