/* Arkyvus extends Sovereign's shared type and phase colors. */
body{--project-accent:#c4a6ff}
[hidden]{display:none!important}
a:focus-visible,button:focus-visible,[role="tabpanel"]:focus-visible{outline:2px solid var(--project-accent);outline-offset:5px}
.skip-link{position:fixed;top:12px;left:20px;z-index:50;transform:translateY(-180%);padding:10px 16px;background:var(--ink);color:var(--void);border-radius:6px}
.skip-link:focus{transform:translateY(0)}
.project-atmos{position:fixed;inset:0;pointer-events:none;background:radial-gradient(70% 65% at 85% 0%,rgba(167,125,255,.15),transparent 65%),radial-gradient(55% 30% at 0% 60%,rgba(90,210,255,.04),transparent 80%)}
.project-hero,.project-section,.nextnav{position:relative;z-index:10;max-width:var(--maxw);margin:0 auto;padding-left:clamp(20px,5vw,52px);padding-right:clamp(20px,5vw,52px)}
.project-hero{padding-top:150px;padding-bottom:80px}
.hero-meta{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-bottom:30px}
.eyebrow,.number{font:11px/1.7 var(--font-mono);letter-spacing:.13em;color:var(--project-accent)}
.flagship{font:10px/1.6 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--project-accent);padding:7px 12px;border:1px solid rgba(167,125,255,.4);border-radius:6px;background:rgba(167,125,255,.07)}
.project-hero h1{font-family:var(--font-display);font-weight:500;font-size:clamp(62px,10vw,108px);letter-spacing:-.04em;line-height:1.05;margin-bottom:24px}
.project-wordmark img{display:block;width:430px;max-width:100%;height:auto;padding:18px 28px;background:var(--ink);border-radius:12px}
.project-tagline{font-family:var(--font-display);font-size:clamp(30px,4.5vw,50px);line-height:1.2;margin-bottom:26px}
.project-tagline em{font-weight:400;color:var(--project-accent)}
.purpose{max-width:760px;font-size:clamp(16px,1.8vw,19px);line-height:1.75;color:var(--ink-dim)}
.actions{display:flex;align-items:center;flex-wrap:wrap;gap:14px;margin-top:30px}
.text-link{display:inline-flex;align-items:center;gap:10px;color:var(--project-accent);font-size:14px;text-decoration:underline;text-underline-offset:5px}
.project-facts{display:flex;flex-wrap:wrap;gap:12px 28px;margin-top:44px;padding-top:20px;border-top:1px solid var(--edge);font:11px/1.7 var(--font-mono);color:var(--ink-dim)}
.project-section{padding-bottom:88px;scroll-margin-top:105px}
.section-intro{max-width:770px;margin-bottom:32px}
h2{font-family:var(--font-display);font-size:clamp(28px,3.8vw,42px);font-weight:500;letter-spacing:-.02em;line-height:1.2;margin:14px 0 18px}
h3{font-family:var(--font-display);font-size:27px;line-height:1.25;font-weight:500;margin:14px 0}
.section-intro p,.prose p{font-size:16px;line-height:1.8;color:var(--ink-dim)}
.split-section{display:grid;grid-template-columns:.85fr 1.15fr;gap:60px}
.split-section .section-intro{margin:0}
.prose p{margin-bottom:20px}
.prose .thesis{border-left:2px solid var(--project-accent);padding-left:22px;color:var(--ink);margin:28px 0 0}
.marketing-cycle{border:1px solid rgba(167,125,255,.3);border-radius:16px;background:var(--panel)}
.cycle-tabs{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;padding:16px}
.cycle-tabs button{min-width:0;min-height:64px;border:1px solid transparent;border-radius:8px;background:transparent;color:var(--ink-dim);font:13px/1.6 var(--font-body);cursor:pointer;padding:10px 4px}
.cycle-tabs button span{display:block;color:var(--project-accent);font:10px/1.5 var(--font-mono);margin-bottom:4px}
.cycle-tabs button:hover{background:rgba(167,125,255,.05);color:var(--ink)}
.cycle-tabs button[aria-selected="true"]{background:rgba(167,125,255,.12);border-color:rgba(167,125,255,.35);color:var(--ink)}
.brand-thread{padding:20px 30px;border-top:1px solid var(--edge);border-bottom:1px solid var(--edge);background:rgba(167,125,255,.04)}
.brand-thread .number{font-size:9px}
.brand-thread p{font-size:13px;color:var(--ink-dim);line-height:1.8;margin-top:6px}
.brand-thread p span{padding:0 8px;color:var(--project-accent)}
.cycle-panel{display:grid;grid-template-columns:1.25fr 1fr;gap:40px;padding:34px;min-height:260px}
.cycle-panel+.cycle-panel{border-top:1px solid var(--edge)}
.cycle-panel h3{font-size:clamp(26px,3vw,32px);margin-top:10px}
.cycle-panel p{font-size:15px;line-height:1.8;color:var(--ink-dim)}
.cycle-panel aside{border-left:1px solid var(--edge);padding-left:28px}
.cycle-panel aside .number{font-size:9px;color:var(--ink-dim)}
.cycle-panel h4{font-family:var(--font-display);font-size:24px;line-height:1.3;font-weight:500;margin:12px 0}
.cycle-panel aside p{font-size:14px}
.caption{font-size:12px;line-height:1.8;color:var(--ink-dim);margin-top:16px}
.method-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}
.method-grid article{border-top:1px solid rgba(167,125,255,.4);padding-top:20px}
.method-grid .number{font-size:9px;letter-spacing:.08em}
.method-grid h3{font-size:25px}
.method-grid p,.economics-note p,.audience-grid p{font-size:15px;line-height:1.8;color:var(--ink-dim)}
.economics-note{border:1px solid var(--edge);border-radius:12px;padding:26px 30px;margin-top:32px;background:var(--panel)}
.economics-note h3{font-size:24px;margin-top:0}
.audience-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.audience-grid article{padding:30px;border:1px solid var(--edge);border-radius:12px;background:var(--panel)}
.audience-grid p{margin-bottom:22px}
.invitation{padding:clamp(24px,4vw,44px);border-radius:16px;border:1px solid rgba(167,125,255,.3);background:linear-gradient(120deg,rgba(167,125,255,.1),var(--panel))}
.invitation>p{max-width:750px;font-size:15px;line-height:1.8;color:var(--ink-dim)}
.sources h2{font:12px var(--font-mono);text-transform:uppercase;letter-spacing:.14em;color:var(--ink-dim);margin-top:0}
.sources>p{font-size:13px;line-height:1.8;color:var(--ink-dim);max-width:850px;margin-bottom:24px}
.sources ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:20px 32px}
.sources a{font-size:14px;color:var(--ink);text-decoration:underline;text-underline-offset:4px}
.sources li span:not([aria-hidden]){display:block;color:var(--ink-dim);font-size:12px;margin-top:5px}
.nextnav{display:flex;gap:12px;flex-wrap:wrap;padding-bottom:60px}
.math-lab{border:1px solid rgba(167,125,255,.3);border-radius:16px;background:var(--void-2);overflow:hidden}
.lab-intro,.math-chapter{padding:clamp(22px,4vw,38px)}
.lab-intro{background:linear-gradient(125deg,rgba(167,125,255,.12),transparent)}
.lab-intro p,.math-heading p,.math-application,.matrix-details p,.lab-caveat{font-size:15px;line-height:1.8;color:var(--ink-dim)}
.math-presets{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:24px}
.math-presets>span{font:11px var(--font-mono);color:var(--ink-dim);margin-right:8px}
.math-presets button{border:1px solid var(--edge);border-radius:7px;background:var(--void-3);color:var(--ink);padding:12px 16px;min-height:44px;font:12px var(--font-body);cursor:pointer}
.math-presets button:hover{border-color:var(--project-accent)}
.math-chapter{border-top:1px solid var(--edge)}
.math-heading{max-width:800px;margin-bottom:28px}
.math-heading h3{font-size:clamp(25px,3.5vw,34px)}
.math-workspace{display:grid;grid-template-columns:minmax(220px,.65fr) minmax(0,1.35fr);gap:32px;align-items:center;margin-bottom:28px}
.math-controls{min-width:0}
.math-controls label{display:flex;justify-content:space-between;gap:12px;font-size:13px;line-height:1.6;color:var(--ink);margin-bottom:8px}
.math-controls output{color:var(--project-accent);font-family:var(--font-mono);white-space:nowrap}
.math-controls input{width:100%;min-height:36px;margin-bottom:16px;accent-color:var(--project-accent);cursor:pointer}
.math-controls input:focus-visible{outline:2px solid var(--project-accent);outline-offset:4px}
.math-controls p{font-size:12px;line-height:1.8;color:var(--ink-dim)}
.budget-control{max-width:650px;margin:0 0 28px}
.math-figure{min-width:0;margin:0}
.math-figure svg{display:block;width:100%;height:auto;overflow:visible}
.math-figure figcaption{font-size:12px;line-height:1.8;color:var(--ink-dim);margin-top:12px}
.journey-node{fill:var(--void-3);stroke:rgba(167,125,255,.45);stroke-width:1.5}
.journey-node.converted{fill:rgba(90,210,255,.1);stroke:var(--accent)}
.journey-node.exit{stroke:var(--ink-faint)}
.journey-edge{fill:none;stroke:var(--project-accent);stroke-width:3;marker-end:url(#journey-arrow)}
.exit-edge{fill:none;stroke:var(--ink-faint);stroke-width:1.5;stroke-dasharray:5 5}
.node-label{font:20px var(--font-body);fill:var(--ink);text-anchor:middle}
.edge-label{font:16px var(--font-mono);fill:var(--project-accent);text-anchor:middle}
.edge-label.muted{fill:var(--ink-dim)}
.chart-axis{stroke:var(--ink-faint);stroke-width:1;fill:none}
.chart-grid{stroke:var(--edge);stroke-width:1;fill:none}
.chart-tick{font:12px var(--font-mono);fill:var(--ink-dim)}
.chart-caption{font:12px var(--font-body);fill:var(--ink-dim)}
.posterior-area{fill:rgba(167,125,255,.25)}
.posterior-line{stroke:var(--project-accent);stroke-width:2.5;fill:none}
.prior-line{stroke:var(--ink-dim);stroke-width:1.5;stroke-dasharray:3 4;fill:none}
.mean-line{stroke:var(--accent);stroke-width:1;stroke-dasharray:5 4;fill:none}
.formula-block{border-left:2px solid var(--project-accent);background:rgba(167,125,255,.05);padding:20px 24px;margin:24px 0}
.formula-block .formula,.matrix-details .formula{font:clamp(15px,2.2vw,21px)/2 'Cambria Math',Georgia,serif;letter-spacing:.015em;color:var(--ink);overflow-wrap:anywhere;margin-bottom:14px}
.formula span{padding:0 10px;color:var(--ink-dim)}
.formula-block>p:not(.formula){font-size:13px;line-height:1.85;color:var(--ink-dim);margin-bottom:12px}
.formula-block>p:last-child{margin-bottom:0}
.math-application strong{color:var(--ink);font-weight:500}
.matrix-details{margin-top:22px;border-top:1px solid var(--edge);padding-top:16px}
.matrix-details summary{font-size:13px;line-height:1.7;color:var(--project-accent);cursor:pointer;min-height:44px;padding:8px 0}
.matrix-details summary:focus-visible{outline:2px solid var(--project-accent);outline-offset:4px}
.matrix-details p{font-size:13px}
.matrix-scroll{max-width:100%;overflow-x:auto}
.matrix-table,.results-table{border-collapse:collapse;width:100%;font:12px/1.7 var(--font-mono);text-align:right}
.matrix-table caption,.results-table caption{text-align:left;color:var(--ink-dim);font:12px/1.7 var(--font-body);padding:12px 0}
.matrix-table th,.matrix-table td,.results-table th,.results-table td{padding:12px 10px;border-bottom:1px solid var(--edge);white-space:nowrap}
.matrix-table th:first-child,.results-table th:first-child{text-align:left}
.matrix-table th,.results-table th{font-weight:500;color:var(--ink-dim)}
.chart-legend{display:flex;gap:12px 24px;flex-wrap:wrap;font:12px/1.6 var(--font-body);color:var(--ink-dim);margin-bottom:20px}
.chart-legend span{display:flex;gap:8px;align-items:center}
.chart-legend i{width:12px;height:12px;border-radius:2px}
.bayes-key,.bayes-bar{background:var(--project-accent);fill:var(--project-accent)}
.markov-key,.markov-bar{background:var(--accent);fill:var(--accent)}
.loss-key{background:rgba(255,93,115,.4)}
.loss-zone{fill:rgba(255,93,115,.08)}
.cost-line{stroke:var(--ph-0);stroke-width:1.5;stroke-dasharray:6 4}
.cost-label{font:12px var(--font-mono);fill:#ffa1b0}
.simulation-results{margin-top:24px}
.decision-readout{padding:18px 20px;background:rgba(90,210,255,.06);border:1px solid rgba(90,210,255,.3);border-radius:8px;font:14px/1.8 var(--font-body);margin-top:24px;color:var(--ink)}
.decision-readout[data-result="hold"]{background:rgba(255,209,102,.05);border-color:rgba(255,209,102,.35)}
.lab-caveat{margin-top:22px;font-size:12px;border-top:1px solid var(--edge);padding-top:20px}
@media(max-width:850px){
  .split-section{grid-template-columns:1fr;gap:22px}
  .cycle-panel{grid-template-columns:1fr;gap:26px}
  .cycle-panel aside{padding-left:0;padding-top:22px;border-left:0;border-top:1px solid var(--edge)}
  .method-grid{grid-template-columns:1fr;gap:24px}
  .math-workspace{grid-template-columns:1fr;gap:20px}
}
@media(max-width:620px){
  .project-hero{padding-top:122px;padding-bottom:60px}
  .project-section{padding-bottom:60px}
  .cycle-tabs{grid-template-columns:repeat(3,minmax(0,1fr));padding:12px}
  .cycle-panel,.brand-thread,.audience-grid article,.economics-note{padding:24px}
  .audience-grid,.sources ul{grid-template-columns:1fr}
  .nextnav .nav-next{margin-left:0}
  .nextnav .btn{max-width:100%}
  .project-wordmark img{padding:14px 18px}
  .formula-block{padding:16px}
  .matrix-table,.results-table{font-size:10px}
  .matrix-table th,.matrix-table td,.results-table th,.results-table td{padding:10px 6px}
}