/* AP3 system page. Editorial layout: no boxes, frames or card borders. Structure comes from type,
   whitespace and flat tint fills. Tokens only (AP3 Visual System v1.0): paper, surface, ink, secondary,
   blue, blue tint, signal. No gradients, glow, shadows or bevels. Radius 0, or 2px on functional controls.
   The numbered badges keep their circles and dashes because those are drawing language (status), not frames. */
:root {
  --sys-paper: var(--paper, #FAFAF8);
  --sys-surface: var(--surface, #F1F1EE);
  --sys-ink: var(--ink, #14161A);
  --sys-secondary: var(--secondary, #4A4E57);
  --sys-rule: var(--rule, #DBDCD6);
  --sys-rule-strong: var(--rule-strong, #B9BBB4);
  --sys-blue: var(--blue, #2B4C7E);
  --sys-tint: var(--blue-tint, #EAF0F8);
  --sys-signal: var(--signal, #B74732);
  --sys-ease: cubic-bezier(.2, 0, 0, 1);
  --sys-mono: var(--mono, "IBM Plex Mono", Consolas, monospace);
  --sys-sans: var(--sans, "IBM Plex Sans", Arial, sans-serif);
}

.phero { border-bottom: 0; }
.sys-sr { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.sys-fine { font: 400 14px/1.5 var(--sys-sans); color: var(--sys-secondary); max-width: 62ch; }
.sys-kicker { font: 400 12px/1.3 var(--sys-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--sys-secondary); }

/* ---- the plate -------------------------------------------------------------------------- */
.sys { padding: 0 0 64px; }
.sys > .wrap { max-width: none; padding: 0; }
/* the drawing is the page: title and controls sit on the sheet, left rail, over empty paper */
.sys-hud { position: absolute; z-index: 5; left: var(--pad, 32px); top: 24px; width: min(300px, 40%); pointer-events: none; display: flex; flex-direction: column; gap: 8px; }
.sys-hud > * { pointer-events: auto; }
.sys-hud .sys-bar, .sys-hud .sys-views { flex-direction: column; align-items: flex-start; gap: 0; margin: 0; }
.sys-hud .sys-top { display: block; margin: 0; }
.sys-hud .sys-trace { background: var(--sys-paper); padding: 16px 0 0; margin-top: 12px; }
.sys-hud .sys-sel select { min-width: 180px; }
.sys-hud h2, .sys-hud .sys-crumbs, .sys-hud .sys-btn:not(.sys-btn-primary), .sys-hud .sys-sel { background: var(--sys-paper); }
.sys-hud .sys-btn { align-self: flex-start; }
.sys-top { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 12px 24px; margin-bottom: 8px; }
.sys-top h2 { font-size: clamp(28px, 3vw, 44px); line-height: 1.04; letter-spacing: -.03em; outline: none; }
.sys-crumbs { display: flex; align-items: center; gap: 10px; margin-top: 16px; font: 400 13px/1.3 var(--sys-mono); color: var(--sys-secondary); min-height: 28px; }
.sys-crumb { font: inherit; color: var(--sys-blue); text-decoration: underline; text-underline-offset: 4px; padding: 4px 0; min-height: 28px; }
.sys-crumb-now { color: var(--sys-ink); }
.sys-start { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
.sys-start .sys-fine { max-width: 40ch; }

/* ---- controls: text and flat tint, no outlines ------------------------------------------- */
.sys-bar, .sys-views { display: flex; flex-wrap: wrap; gap: 4px 20px; align-items: center; margin-bottom: 8px; }
.sys-bar:empty { display: none; }
.sys-btn {
  min-height: 44px; min-width: 44px; padding: 0 4px; border: 0; border-radius: 2px;
  background: none; color: var(--sys-ink); font: 400 14px/1 var(--sys-mono); letter-spacing: .02em;
  text-decoration: underline; text-decoration-color: var(--sys-rule-strong); text-underline-offset: 6px;
  transition: color 160ms var(--sys-ease), text-decoration-color 160ms var(--sys-ease), background 160ms var(--sys-ease);
}
.sys-btn:hover:not(:disabled) { color: var(--sys-blue); text-decoration-color: var(--sys-blue); }
.sys-btn[aria-pressed="true"] { text-decoration-color: var(--sys-ink); text-decoration-thickness: 3px; }
.sys-btn-primary { background: var(--sys-ink); color: var(--sys-paper); text-decoration: none; padding: 0 20px; }
.sys-btn-primary:hover:not(:disabled) { background: var(--sys-blue); color: var(--sys-paper); }
.sys-btn:disabled { color: var(--sys-secondary); text-decoration: none; cursor: default; }
.sys-btn:focus-visible, .sys-b:focus-visible, .sys-ix:focus-visible, .sys-stage:focus-visible, .sys-step:focus-visible,
.sys-sel select:focus-visible, .sys-x:focus-visible, .sys-crumb:focus-visible, .sys-rel summary:focus-visible { outline: 2px solid var(--sys-blue); outline-offset: 3px; }
.sys-sel { display: flex; align-items: center; gap: 8px; min-height: 44px; font: 400 13px/1 var(--sys-mono); color: var(--sys-secondary); }
.sys-sel select {
  min-height: 44px; padding: 0 12px; border: 0; border-radius: 2px; background: var(--sys-tint);
  font: 400 14px/1 var(--sys-mono); color: var(--sys-ink); max-width: 100%;
}

[data-act="zout"], [data-act="zin"] { font-size: 22px; text-decoration: none; min-width: 44px; }

/* ---- guided trace ---------------------------------------------------------------------- */
.sys-trace { padding: 24px 0 8px; margin-bottom: 8px; }
.sys-steps { list-style: none; display: flex; flex-wrap: wrap; gap: 4px 20px; margin-bottom: 16px; }
.sys-step { display: flex; align-items: baseline; gap: 8px; min-height: 44px; padding: 0 2px; font: 400 14px/1 var(--sys-mono); color: var(--sys-secondary); }
.sys-step.is-cur { color: var(--sys-ink); text-decoration: underline; text-decoration-thickness: 3px; text-underline-offset: 8px; }
.sys-step-n { font-size: 12px; }
.sys-trace-note { font: 400 clamp(18px, 1.6vw, 22px)/1.45 var(--sys-sans); max-width: 56ch; margin-bottom: 16px; }
.sys-trace-note strong { font-weight: 500; }
.sys-gate-tag { display: inline-block; margin-left: 12px; padding: 2px 8px; background: var(--sys-tint); font: 400 12px/1.5 var(--sys-mono); letter-spacing: .04em; text-transform: uppercase; }
.sys-trace-nav { display: flex; flex-wrap: wrap; gap: 4px 20px; align-items: center; }

/* ---- stage and side -------------------------------------------------------------------- */
.sys-grid { display: block; }
.sys-stagewrap { position: relative; }
.sys-stage {
  position: relative; isolation: isolate; height: max(640px, calc(100vh - var(--header-h, 64px))); background: var(--sys-paper);
  overflow: hidden; touch-action: pan-y; cursor: grab; user-select: none; -webkit-user-select: none;
}
.sys-stage:active { cursor: grabbing; }
.sys-static { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; }
.sys-static[hidden] { display: none; }
.sys-static svg, .sys-fig svg { width: 100%; height: 100%; max-height: 100%; }
.sys-canvas { position: absolute; left: 0; top: 0; display: block; }
.sys-overlay { position: absolute; left: 0; top: 0; pointer-events: none; overflow: hidden; }
.sys-hl { position: absolute; left: 0; top: 0; width: 100%; height: 100%; }
.sys-badges { position: absolute; left: 0; top: 0; }
.sys-b, .sys-lv { position: absolute; left: 0; top: 0; pointer-events: auto; will-change: transform; }
.sys-b {
  width: 28px; height: 28px; margin: -40px 0 0 -14px; border: 1.5px solid var(--sys-blue); border-radius: 50%;
  background: var(--sys-paper); color: var(--sys-blue); font: 400 12px/25px var(--sys-mono); text-align: center; padding: 0;
}
.sys-b::after { content: ""; position: absolute; left: 50%; top: 100%; width: 1px; height: 12px; background: currentColor; }
.sys-b.k-store { border-color: var(--sys-secondary); color: var(--sys-secondary); }
.sys-b.k-operator, .sys-b.k-gate, .sys-b.k-note { border-color: var(--sys-ink); color: var(--sys-ink); }
.sys-b.s-not-built { border-color: var(--sys-signal); color: var(--sys-signal); border-style: dashed; }
.sys-b.s-conditional, .sys-b.s-person { border-style: dashed; }
.sys-b.is-dim { border-color: var(--sys-rule-strong); color: var(--sys-secondary); }
.sys-b.is-sel { background: var(--sys-blue); color: var(--sys-paper); border-color: var(--sys-blue); }
.sys-lv { margin: -8px 0 0 -22px; font: 400 12px/16px var(--sys-mono); letter-spacing: .06em; color: var(--sys-secondary); pointer-events: none; }
.sys-label {
  position: absolute; max-width: 220px; padding: 4px 8px; background: var(--sys-paper);
  font: 500 13px/1.3 var(--sys-mono); color: var(--sys-ink); pointer-events: none;
}
.sys-label[hidden] { display: none; }
.sys-label-id { color: var(--sys-blue); }

/* ---- panel: a flat tinted sheet (side column on desktop, bottom sheet on touch widths) --- */
.sys-panel {
  position: absolute; right: 0; top: 0; width: min(360px, 100%); max-height: 100%; overflow: auto;
  background: var(--sys-surface); padding: 24px;
}
.sys-panel[hidden] { display: none; }
.sys-panel-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.sys-panel-id { font: 400 13px/1 var(--sys-mono); color: var(--sys-blue); letter-spacing: .06em; }
.sys-panel-id::before { content: "No. "; color: var(--sys-secondary); }
.sys-x { min-height: 44px; padding: 0 4px; font: 400 13px/1 var(--sys-mono); text-decoration: underline; text-underline-offset: 4px; }
.sys-panel h3 { font-size: 28px; line-height: 1.1; letter-spacing: -.025em; margin-bottom: 12px; }
.sys-panel h4 { font: 400 12px/1.3 var(--sys-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--sys-secondary); margin: 24px 0 8px; }
.sys-panel ul { list-style: none; font-size: 15px; line-height: 1.5; }
.sys-panel li + li { margin-top: 4px; }
.sys-role { font-size: 17px; line-height: 1.5; margin-bottom: 16px; }
.sys-meta { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px; font-size: 14px; }
.sys-meta dt { font: 400 12px/1.6 var(--sys-mono); text-transform: uppercase; letter-spacing: .06em; color: var(--sys-secondary); }
.sys-meta dd { margin: 0; }
.sys-acts { display: flex; flex-wrap: wrap; gap: 4px 20px; align-items: center; margin-top: 24px; }

/* ---- index: a typographic list --------------------------------------------------------- */
.sys-side { margin-top: 24px; }
.sys-index { columns: 3 320px; column-gap: 48px; }
.sys-ix-g { break-inside: avoid; }
.sys.is-3d:not(.index-open) .sys-side { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.sys.is-3d ~ .sys-details { display: none; }
.sys-ix-r { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.sys-ix-g { margin-bottom: 32px; }
.sys-ix-g h4 { font: 400 12px/1.3 var(--sys-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--sys-secondary); margin: 0 0 12px; }
.sys-ix-g ol { list-style: none; }
.sys-ix { display: flex; gap: 14px; align-items: flex-start; width: 100%; text-align: left; padding: 8px 6px; min-height: 44px; border-radius: 2px; }
button.sys-ix:hover, button.sys-ix.is-sel { background: var(--sys-tint); }
.sys-ix.is-dim .sys-ix-n, .sys-ix.is-dim .sys-ix-r { color: var(--sys-secondary); }
.sys-ix-b { flex: none; width: 28px; height: 28px; border: 1.5px solid var(--sys-blue); border-radius: 50%; font: 400 12px/25px var(--sys-mono); text-align: center; color: var(--sys-blue); background: var(--sys-paper); }
.sys-ix.k-store .sys-ix-b { border-color: var(--sys-secondary); color: var(--sys-secondary); }
.sys-ix.s-not-built .sys-ix-b { border-color: var(--sys-signal); color: var(--sys-signal); border-style: dashed; }
.sys-ix.s-conditional .sys-ix-b, .sys-ix.s-person .sys-ix-b { border-style: dashed; }
.sys-ix-t { display: flex; flex-direction: column; gap: 2px; }
.sys-ix-n { font: 500 16px/1.25 var(--sys-sans); color: var(--sys-ink); letter-spacing: -.01em; }
.sys-ix-s { font: 400 12px/1.4 var(--sys-mono); letter-spacing: .02em; color: var(--sys-secondary); }
.sys-ix-a { font: 400 13px/1.4 var(--sys-mono); color: var(--sys-blue); text-decoration: underline; text-underline-offset: 3px; align-self: flex-start; padding: 4px 0; }
.sys-rel { margin-top: 24px; }
.sys-rel summary { font: 400 13px/1.3 var(--sys-mono); cursor: pointer; min-height: 32px; }
.sys-rel ul { list-style: none; font-size: 14px; line-height: 1.6; margin-top: 8px; color: var(--sys-secondary); }
.sys-caption { margin-top: 24px; }

/* ---- reading aids: set like magazine back matter ---------------------------------------- */
.sys-read, .sys-claims, .sys-details { padding: 64px 0 0; }
.sys-read h2, .sys-claims h2, .sys-details h2 { font-size: clamp(32px, 4vw, 56px); line-height: 1.04; letter-spacing: -.03em; margin-bottom: 32px; }
.sys-read-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 32px; max-width: 72ch; }
.sys-key { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px 32px !important; font-size: 15px !important; }
.sys-statuskey summary { font: 400 13px/1.3 var(--sys-mono); cursor: pointer; min-height: 32px; }
.sys-statuskey table { margin-top: 12px; }
.sys-gapline { font: 400 clamp(17px, 1.5vw, 20px)/1.45 var(--sys-sans); }
.sys-gapline strong { font: 400 12px/1.4 var(--sys-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--sys-secondary); margin-right: 8px; }
.sys-read-grid h2 { font-size: clamp(24px, 2.4vw, 32px); }
.sys-key { list-style: none; display: grid; gap: 16px; font-size: 17px; }
.sys-key li { display: flex; gap: 16px; align-items: center; }
.sw { flex: none; width: 34px; height: 18px; display: inline-block; border: 1.5px solid var(--sys-blue); }
.sw-skill { background: var(--sys-tint); }
.sw-agent { background: var(--sys-blue); }
.sw-dash { border-style: dashed; background: none; }
.sw-gate { width: 8px; margin-left: 13px; margin-right: 13px; background: var(--sys-signal); border-color: var(--sys-signal); }
.sw-line { height: 0; border: 0; border-top: 2px solid var(--sys-blue); }
.sw-mast { height: 0; border: 0; border-top: 4px solid var(--sys-ink); }
.sys-status { border-collapse: collapse; width: 100%; font-size: 16px; }
.sys-status th, .sys-status td { text-align: left; vertical-align: top; padding: 0 24px 20px 0; }
.sys-status th { font: 500 14px/1.5 var(--sys-mono); width: 34%; }
.sys-claims-list { list-style: none; display: grid; gap: 24px; max-width: 64ch; }
.sys-claims-list li { font: 400 clamp(18px, 1.6vw, 22px)/1.45 var(--sys-sans); }
.sys-claims-list strong { display: block; font: 400 12px/1.4 var(--sys-mono); letter-spacing: .08em; margin-bottom: 4px; text-transform: uppercase; color: var(--sys-secondary); }

.sys-detail { padding: 64px 0 0; }
.sys-detail-head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 12px 24px; margin-bottom: 24px; }
.sys-detail-head h3 { font-size: clamp(26px, 2.8vw, 40px); line-height: 1.08; letter-spacing: -.025em; }
.sys-detail-grid { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); gap: 48px; align-items: start; }
.sys-fig { background: var(--sys-paper); }
.sys-fig svg { height: auto; aspect-ratio: 1000 / 1280; }

/* ---- states ------------------------------------------------------------------------------ */
.sys.is-loading .sys-stage { cursor: progress; }
.sys.is-3d .sys-static { display: none; }
@media (max-width: 1040px) {
  .sys-hud { position: static; width: auto; padding: 24px var(--pad, 24px) 8px; }
  .sys-hud .sys-bar, .sys-hud .sys-views { flex-direction: row; flex-wrap: wrap; gap: 4px 20px; }
  .sys-detail-grid { grid-template-columns: minmax(0, 1fr); gap: 40px; }
}
@media (max-width: 760px) {
  .sys-stage { height: max(560px, calc(100vh - 130px)); }
  .sys-panel {
    position: fixed; left: 0; right: 0; bottom: 0; top: auto; width: auto; max-height: 56vh; z-index: 40;
    padding: 20px var(--pad, 24px) calc(20px + env(safe-area-inset-bottom));
  }
  .sys-read, .sys-claims, .sys-details { padding-top: 64px; }
}
@media (prefers-reduced-motion: reduce) {
  .sys-btn { transition: none; }
}