/* ============================================================
     Reinterpretation of Homepage Mockup v0.5 into the canonical
     Invariance | Arc system (Direction A). Limestone ground, ink
     lines, single teal accent. Amber/Steel held as Arc reserves.
     Rhythm from one ink band + hairline rules, not color washes.
     ============================================================ */
  html, body { margin: 0; background: var(--limestone); color: var(--ink); }
  body {
    font-family: var(--font-sans);
    font-size: var(--size-body-lg);
    line-height: var(--leading-normal);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }
  a { color: var(--teal); text-decoration: none; transition: var(--transition-control); }
  a:hover { color: var(--teal-deep); }

  .wrap { max-width: var(--container-wide); margin: 0 auto; padding: 0 var(--page-gutter); }
  .measure { max-width: 68ch; }

  /* --- Eyebrow / kicker --- */
  .eyebrow {
    font-family: var(--font-sans); font-size: var(--size-eyebrow); font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-wider); text-transform: uppercase; color: var(--teal);
    display: inline-flex; align-items: center; gap: 10px;
  }
  .eyebrow::before { content: ""; width: 18px; height: 1.6px; background: var(--teal); display: inline-block; }

  .meta {
    font-family: var(--font-mono); font-size: var(--size-caption);
    letter-spacing: 0.08em; color: var(--ink-mute);
  }

  /* --- Quiet notice (replaces the inverted draft bar) --- */
  .notice {
    border-bottom: 1px solid var(--rule);
    background: color-mix(in srgb, var(--limestone) 60%, transparent);
  }
  .notice .wrap {
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    padding-top: 9px; padding-bottom: 9px; flex-wrap: wrap;
  }
  .notice .tag {
    font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--ink-mute); display: inline-flex; align-items: center; gap: 10px; white-space: nowrap;
  }
  .notice .meta { white-space: nowrap; }
  .notice .tag .dot { width: 5px; height: 5px; border-radius: 50%; background: var(--teal); }

  /* --- Header / nav (reconciled with the homepage chrome) --- */
  header.site {
    position: sticky; top: 0; z-index: 40;
    background: color-mix(in srgb, var(--limestone) 92%, transparent);
    backdrop-filter: var(--blur-bar); -webkit-backdrop-filter: var(--blur-bar);
    border-bottom: 1px solid var(--rule-soft);
  }
  .navrow { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 62px; }
  .wordmark {
    font-family: var(--font-serif); font-weight: var(--weight-semibold); font-size: 21px;
    letter-spacing: 0.01em; color: var(--ink); text-decoration: none;
    display: inline-flex; align-items: baseline; gap: 8px; white-space: nowrap;
  }
  .wordmark .pipe { color: var(--rule-strong); font-weight: var(--weight-regular); }
  .wordmark .arc { font-style: italic; color: var(--teal); font-size: 19px; }
  .nav-actions { display: flex; align-items: center; gap: 8px; }
  .navlinks { display: flex; align-items: center; gap: 22px; }
  .navlinks a { font-family: var(--font-sans); font-size: 13.5px; font-weight: var(--weight-medium); color: var(--ink-soft); letter-spacing: 0.01em; text-decoration: none; }
  .navlinks a:hover { color: var(--ink); }
  .navlinks .arcnav { color: var(--steel); }
  .navlinks .arcnav + .arcnav { color: var(--amber); }
  .navcta {
    font-family: var(--font-sans); font-size: 13px; font-weight: var(--weight-semibold);
    color: #fff; background: var(--teal); border-radius: var(--radius-pill);
    padding: 9px 16px; letter-spacing: 0.01em; white-space: nowrap; text-decoration: none;
  }
  .navcta:hover { background: var(--teal-deep); }
  .menu { display: none; position: relative; }
  .menu > summary {
    list-style: none; cursor: pointer; font-family: var(--font-sans); font-size: 13px; font-weight: var(--weight-semibold);
    color: var(--ink); border: 1px solid var(--rule-strong); border-radius: var(--radius-pill);
    padding: 9px 14px; display: inline-flex; align-items: center; gap: 7px;
  }
  .menu > summary::-webkit-details-marker { display: none; }
  .menu > summary .bars { width: 14px; height: 10px; position: relative; display: inline-block; }
  .menu > summary .bars::before, .menu > summary .bars::after, .menu > summary .bars span { content: ""; position: absolute; left: 0; right: 0; height: 1.6px; background: var(--ink); border-radius: 2px; }
  .menu > summary .bars::before { top: 0; }
  .menu > summary .bars span { top: 4.2px; }
  .menu > summary .bars::after { bottom: 0; }
  .menu[open] > summary { border-color: var(--ink); }
  .menu-panel { position: absolute; right: 0; top: calc(100% + 10px); width: min(78vw, 260px); background: var(--panel); border: 1px solid var(--rule); border-radius: 14px; box-shadow: var(--shadow-lg); padding: 8px; display: grid; gap: 2px; z-index: 50; }
  .menu-panel a { padding: 11px 12px; border-radius: 9px; text-decoration: none; color: var(--ink); font-family: var(--font-sans); font-size: 14px; font-weight: var(--weight-medium); }
  .menu-panel a:hover { background: var(--ink-tint); }
  .menu-panel .arcnav { color: var(--steel); }
  .menu-panel .arcnav:last-of-type { color: var(--amber); }

  /* --- Section rhythm: one idea per band, generous air --- */
  .band { padding: var(--band-pad-y) 0; border-bottom: 1px solid var(--rule); }
  .band--tight { padding: var(--band-pad-y-sm) 0; }
  .band--well { background: var(--surface-well); }
  .band--ink { background: var(--ink); color: var(--limestone); border-bottom: none; }

  /* --- Headings --- */
  h1.hero {
    font-family: var(--font-serif); font-weight: var(--weight-medium);
    font-size: clamp(40px, 4.6vw, 60px); line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight); color: var(--ink); margin: 22px 0 0; max-width: 15ch;
    text-wrap: balance;
  }
  h2.sec {
    font-family: var(--font-serif); font-weight: var(--weight-medium);
    font-size: clamp(28px, 2.6vw, 36px); line-height: var(--leading-snug);
    letter-spacing: var(--tracking-tight); color: inherit; margin: 16px 0 0; max-width: 34ch;
    text-wrap: balance;
  }
  .lede {
    font-family: var(--font-sans); font-size: 17px; line-height: var(--leading-relaxed);
    color: var(--ink-soft); margin: 18px 0 0; max-width: 66ch;
  }

  /* ============================================================
     HERO
     ============================================================ */
  .hero-band { padding: 96px 0 104px; border-bottom: 1px solid var(--rule); }
  .hero-grid {
    display: grid; grid-template-columns: 1.12fr 0.88fr; gap: 64px; align-items: center;
  }
  .hero .support {
    font-family: var(--font-sans); font-size: 18px; line-height: var(--leading-relaxed);
    color: var(--ink-soft); margin: 24px 0 0; max-width: 48ch;
  }
  .hero .statement {
    font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 25px;
    line-height: 1.32; color: var(--ink); max-width: 34ch;
    margin: 34px 0 0; padding: 6px 0 6px 24px; border-left: 2px solid var(--teal);
  }
  .hero .companion {
    font-family: var(--font-sans); font-size: 14.5px; line-height: 1.6; color: var(--ink-soft);
    margin: 18px 0 0 25px; max-width: 52ch;
  }
  .hero .actions { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }

  .btn {
    font-family: var(--font-sans); font-size: 15px; font-weight: var(--weight-semibold);
    border-radius: var(--radius-pill); padding: 12px 24px; letter-spacing: 0.01em;
    transition: var(--transition-control); cursor: pointer; border: 1px solid transparent;
  }
  .btn--primary { background: var(--teal); color: var(--limestone); border-color: var(--teal); }
  .btn--primary:hover { background: var(--teal-deep); border-color: var(--teal-deep); color: var(--limestone); }
  .btn--secondary { background: transparent; color: var(--ink); border-color: var(--rule-strong); }
  .btn--secondary:hover { color: var(--teal); border-color: var(--teal); }

  /* Gate mark panel */
  .markpanel {
    background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md); padding: 34px 34px 26px;
    display: flex; flex-direction: column; align-items: center; gap: 18px;
    box-shadow: var(--shadow-md), var(--ring-inset);
  }
  .markpanel svg { width: 100%; height: auto; max-width: 320px; display: block; }
  .markpanel .caption {
    display: flex; align-items: center; gap: 12px; padding-top: 8px;
    border-top: 1px solid var(--rule-soft); width: 100%; justify-content: center;
  }
  .markpanel .caption span { font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute); letter-spacing: 0.04em; }
  .markpanel .caption .lit { color: var(--teal); }
  .markpanel .caption .sep { width: 4px; height: 4px; border-radius: 50%; background: var(--rule-strong); }

  /* Gate mark — static line-geometry mark, always visible. stroke-opacity
     attributes carry the line lightness of the entropy field. The three-act
     loop is layered on by JS; this static state is the reduced-motion fallback. */
  .gate .flow path, .gate .boundary path { opacity: 1; }
  .markstage { position: relative; width: 100%; display: flex; justify-content: center; }
  .verdict {
    position: absolute; left: 50%; bottom: 5%; transform: translateX(-50%);
    display: flex; align-items: center; gap: 9px; opacity: 0;
    background: color-mix(in srgb, var(--panel) 90%, transparent);
    border: 1px solid var(--rule-soft); border-radius: var(--radius-pill);
    padding: 5px 6px 5px 13px; box-shadow: var(--shadow-xs);
    pointer-events: none; white-space: nowrap;
  }
  .verdict .vlabel { font-family: var(--font-mono); font-size: 11px; color: var(--ink-soft); letter-spacing: 0.02em; }
  .verdict .vpill {
    font-family: var(--font-sans); font-size: 10px; font-weight: var(--weight-semibold);
    letter-spacing: 0.07em; padding: 2px 9px; border-radius: var(--radius-pill); border: 1px solid;
  }
  .vpill.permit { color: var(--decision-permit); border-color: color-mix(in srgb, var(--decision-permit) 42%, transparent); background: var(--decision-permit-tint); }
  .vpill.defer  { color: var(--decision-defer);  border-color: color-mix(in srgb, var(--decision-defer) 42%, transparent);  background: var(--decision-defer-tint); }
  .vpill.block  { color: var(--decision-block);  border-color: color-mix(in srgb, var(--decision-block) 42%, transparent);  background: var(--decision-block-tint); }
  .markline { font-family: var(--font-serif); font-style: italic; font-size: 15px; color: var(--ink-soft); text-align: center; margin: 4px 0 0; }

  /* ============================================================
     TWO OUTCOMES
     ============================================================ */
  .exlead {
    font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 26px;
    line-height: 1.32; max-width: 36ch; margin: 22px 0 0; color: var(--ink); text-wrap: balance;
  }
  .paths { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 40px; }
  .path {
    background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm); padding: 28px 30px; display: flex; flex-direction: column; gap: 14px;
  }
  .path.good { border-color: color-mix(in srgb, var(--teal) 32%, var(--rule-soft)); box-shadow: var(--shadow-sm), var(--ring-inset); }
  .path .phead { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
  .path .label {
    font-family: var(--font-sans); font-size: 12.5px; font-weight: var(--weight-semibold);
    letter-spacing: 0.05em; text-transform: uppercase;
  }
  .path.bad .label { color: var(--ink-mute); }
  .path.good .label { color: var(--teal); }
  .path .seq { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 13px; }
  .path .seq li { display: flex; gap: 14px; align-items: baseline; }
  .path .seq .n { font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute); min-width: 16px; }
  .path .seq .tx { font-family: var(--font-sans); font-size: 15px; color: var(--ink-soft); line-height: 1.5; }
  .path.bad .seq li:last-child .tx { color: var(--decision-block); font-weight: var(--weight-semibold); }
  .path.good .seq li:nth-last-child(-n+2) .tx { color: var(--ink); font-weight: var(--weight-semibold); }

  .badge {
    font-family: var(--font-sans); font-size: 11.5px; font-weight: var(--weight-semibold);
    letter-spacing: 0.04em; padding: 4px 12px 4px 10px; border-radius: var(--radius-pill);
    display: inline-flex; align-items: center; gap: 7px; border: 1px solid;
  }
  .badge .bdot { width: 6px; height: 6px; border-radius: 50%; }
  .badge.block { color: var(--decision-block); border-color: color-mix(in srgb, var(--decision-block) 36%, transparent); background: var(--decision-block-tint); }
  .badge.block .bdot { background: var(--decision-block); }
  .badge.permit { color: var(--decision-permit); border-color: color-mix(in srgb, var(--decision-permit) 36%, transparent); background: var(--decision-permit-tint); }
  .badge.permit .bdot { background: var(--decision-permit); }

  .exclose { margin-top: 32px; max-width: 66ch; color: var(--ink-soft); font-size: 16px; line-height: 1.65; }
  .exclose b { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 18px; color: var(--ink); font-style: italic; }

  /* See-it-in-action: canonical commitment examples mirroring the hero mark */
  .decklist { margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--rule); }
  .decklabel { font-family: var(--font-sans); font-size: 11.5px; font-weight: var(--weight-semibold); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-mute); }
  .decks { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
  .deck { display: inline-flex; align-items: center; gap: 12px; padding: 8px 9px 8px 15px; background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-pill); box-shadow: var(--shadow-xs); }
  .deck .dact { font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-soft); letter-spacing: 0.01em; white-space: nowrap; }
  .deck .vpill { font-size: 10px; }

  /* Guarantee strip under the rail — Trajectory-style assurances, compressed */
  .guarantees { margin-top: 36px; padding-top: 30px; border-top: 1px solid var(--rule-soft); display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 36px; align-items: start; }
  .gtitle { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 22px; line-height: 1.3; color: var(--ink); margin: 0; max-width: 26ch; }
  .glist { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 13px 28px; }
  .glist li { font-family: var(--font-sans); font-size: 14.5px; line-height: 1.5; color: var(--ink-soft); padding-left: 18px; position: relative; }
  .glist li::before { content: ""; position: absolute; left: 0; top: 8px; width: 7px; height: 7px; border: 1.4px solid var(--teal); border-radius: 50%; }

  /* Case index link (replaces the standalone Evidence carousel) */
  .caseindex { margin-top: 30px; font-size: 14px; font-weight: var(--weight-medium); }

  /* ============================================================
     FAILURE PATH
     ============================================================ */
  .steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin-top: 44px; }
  .step { border-top: 2px solid var(--ink); padding-top: 16px; }
  .step .n { font-family: var(--font-mono); font-size: 12px; color: var(--ink-mute); letter-spacing: 0.06em; }
  .step .t { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 21px; margin: 8px 0 8px; line-height: 1.2; }
  .step p { font-size: 14.5px; color: var(--ink-soft); line-height: 1.55; }
  .patternclose { margin-top: 36px; font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 22px; color: var(--ink); max-width: 40ch; }

  /* Incident strip */
  .incidents { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin-top: 44px; border-top: 1px solid var(--rule); }
  .incident { padding: 20px 26px 0 0; }
  .incident + .incident { padding-left: 26px; border-left: 1px solid var(--rule); }
  .incident .src {
    font-family: var(--font-mono); font-size: 11px; font-weight: var(--weight-regular);
    letter-spacing: 0.08em; text-transform: uppercase; color: var(--teal); display: block; margin-bottom: 8px;
  }
  .incident p { font-size: 14px; color: var(--ink-soft); line-height: 1.55; }

  /* ============================================================
     RAIL DIAGRAM
     ============================================================ */
  .railhead { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; flex-wrap: wrap; margin-bottom: 14px; }
  .toggle {
    display: inline-flex; align-items: center; gap: 14px; padding: 9px 18px;
    background: var(--panel); border: 1px solid var(--rule); border-radius: var(--radius-pill);
  }
  .toggle .opt { font-family: var(--font-sans); font-size: 12.5px; font-weight: var(--weight-semibold); color: var(--ink-mute); transition: var(--transition-control); }
  .toggle .opt.on { color: var(--ink); }
  .switch {
    appearance: none; -webkit-appearance: none; cursor: pointer; position: relative;
    width: 40px; height: 22px; border-radius: var(--radius-pill); background: var(--rule-strong);
    border: none; transition: background var(--dur-base) var(--ease-standard); margin: 0;
  }
  .switch::after {
    content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%;
    background: var(--panel); box-shadow: var(--shadow-xs); transition: transform var(--dur-base) var(--ease-standard);
  }
  .switch:checked { background: var(--decision-block); }
  .switch:checked::after { transform: translateX(18px); }

  .railwrap {
    margin-top: 30px; background: var(--panel); border: 1px solid var(--rule-soft);
    border-radius: var(--radius-md); box-shadow: var(--shadow-sm); padding: 36px 36px 30px;
  }
  .rail { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; }
  .node { padding: 6px 24px; position: relative; }
  .node + .node { border-left: 1px solid var(--rule); }
  .node .t { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 18px; margin-bottom: 5px; }
  .node .c { font-size: 13.5px; color: var(--ink-soft); line-height: 1.45; }
  .node .who { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.06em; margin-top: 12px; color: var(--ink-mute); }
  .node.authority .who { color: var(--teal); }
  .node.authority {
    border-left: 1.6px solid var(--teal); margin-left: -1px;
    background: linear-gradient(var(--teal-tint), var(--teal-tint));
    border-radius: var(--radius-xs); transition: background var(--dur-slow) var(--ease-standard);
  }
  .node.record .t { font-family: var(--font-serif); font-style: italic; }
  .node.record .who { color: var(--ink-mute); }
  .chips { margin-top: 12px; display: flex; gap: 7px; flex-wrap: wrap; }
  .chip {
    font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.04em; padding: 3px 9px;
    border: 1px solid; border-radius: var(--radius-pill); transition: var(--transition-control);
  }
  .chip.p { color: var(--decision-permit); border-color: color-mix(in srgb, var(--decision-permit) 40%, transparent); }
  .chip.d { color: var(--decision-defer); border-color: color-mix(in srgb, var(--decision-defer) 40%, transparent); }
  .chip.b { color: var(--decision-block); border-color: color-mix(in srgb, var(--decision-block) 40%, transparent); }
  /* active decision highlighting */
  body:not(.adv) .chip.p { background: var(--decision-permit); color: var(--limestone); border-color: var(--decision-permit); }
  body.adv .chip.b { background: var(--decision-block); color: var(--limestone); border-color: var(--decision-block); }
  body.adv .node.authority { background: linear-gradient(var(--decision-block-tint), var(--decision-block-tint)); border-left-color: var(--decision-block); }
  body.adv .node.authority .who { color: var(--decision-block); }

  .bndnote {
    font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--teal); text-align: center; margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--rule-soft);
  }
  body.adv .bndnote { color: var(--decision-block); }
  .reading {
    margin-top: 26px; font-size: 15px; line-height: 1.65; color: var(--ink-soft); max-width: 72ch;
  }
  .reading.org { display: block; }
  .reading.adv { display: none; }
  body.adv .reading.org { display: none; }
  body.adv .reading.adv { display: block; color: var(--ink-soft); border-left: 2px solid var(--decision-block); padding-left: 18px; }
  .standing { margin-top: 34px; font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 21px; max-width: 40ch; color: var(--ink); }

  /* ============================================================
     SURFACES
     ============================================================ */
  .bridge { max-width: 66ch; color: var(--ink-soft); font-size: 16px; line-height: 1.65; margin: 0 0 38px; }
  .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
  .card {
    background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm); padding: 28px 28px 22px; display: flex; flex-direction: column;
    transition: box-shadow var(--dur-base) var(--ease-standard), transform var(--dur-base) var(--ease-standard), border-color var(--dur-base) var(--ease-standard);
  }
  .card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
  .card .tag {
    font-family: var(--font-sans); font-size: 11px; font-weight: var(--weight-semibold);
    letter-spacing: 0.12em; text-transform: uppercase; color: var(--teal); margin-bottom: 16px;
  }
  .card .q { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 21px; line-height: 1.28; color: var(--ink); }
  .card > p { font-size: 14.5px; color: var(--ink-soft); margin-top: 14px; line-height: 1.55; }
  .card .inc { margin-top: 20px; border-top: 1px solid var(--rule-soft); padding-top: 16px; font-size: 13.5px; color: var(--ink-soft); line-height: 1.5; }
  .card .inc b { font-family: var(--font-mono); font-weight: var(--weight-regular); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; display: block; color: var(--ink-mute); margin-bottom: 6px; }
  .card .more { margin-top: auto; padding-top: 18px; font-size: 13.5px; font-weight: var(--weight-medium); }

  /* ============================================================
     TWO ARCS (ink band)
     ============================================================ */
  .band--ink .eyebrow { color: color-mix(in srgb, var(--teal) 70%, var(--limestone)); }
  .band--ink .eyebrow::before { background: color-mix(in srgb, var(--teal) 70%, var(--limestone)); }
  .band--ink h2.sec { color: var(--limestone); }
  .band--ink .lede { color: color-mix(in srgb, var(--limestone) 72%, var(--ink)); }
  .bridgeblock {
    font-family: var(--font-sans); font-size: 17px; line-height: 1.7; max-width: 68ch; margin-top: 34px;
    padding: 6px 0 6px 24px; border-left: 2px solid color-mix(in srgb, var(--teal) 70%, var(--limestone));
    color: color-mix(in srgb, var(--limestone) 80%, var(--ink));
  }
  .arccards { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 40px; }
  .arccard {
    background: color-mix(in srgb, var(--limestone) 6%, transparent); border: 1px solid color-mix(in srgb, var(--limestone) 16%, transparent);
    border-radius: var(--radius-md); padding: 30px 30px; display: block; color: var(--limestone);
    transition: var(--transition-control);
  }
  .arccard:hover { background: color-mix(in srgb, var(--limestone) 10%, transparent); }
  .arccard.sec { border-top: 2px solid var(--steel); }
  .arccard.gov { border-top: 2px solid var(--amber); }
  .arccard .k { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; }
  .arccard.sec .k { color: color-mix(in srgb, var(--steel) 60%, var(--limestone)); }
  .arccard.gov .k { color: color-mix(in srgb, var(--amber) 70%, var(--limestone)); }
  .arccard .t { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 25px; margin: 12px 0 10px; color: var(--limestone); }
  .arccard p { font-size: 15px; color: color-mix(in srgb, var(--limestone) 72%, var(--ink)); line-height: 1.55; }

  .matrixnote { margin-top: 40px; font-size: 14px; color: color-mix(in srgb, var(--limestone) 58%, var(--ink)); max-width: 64ch; }
  .matrix { margin-top: 22px; border: 1px solid color-mix(in srgb, var(--limestone) 16%, transparent); border-radius: var(--radius-md); overflow: hidden; }
  .mrow { display: grid; grid-template-columns: 1fr 1fr; }
  .mrow + .mrow { border-top: 1px solid color-mix(in srgb, var(--limestone) 12%, transparent); }
  .mcell { padding: 20px 26px; font-size: 14px; color: color-mix(in srgb, var(--limestone) 70%, var(--ink)); line-height: 1.55; }
  .mcell + .mcell { border-left: 1px solid color-mix(in srgb, var(--limestone) 12%, transparent); }
  .mcell b { font-family: var(--font-serif); font-weight: var(--weight-medium); color: var(--limestone); font-size: 16px; display: block; margin-bottom: 4px; }
  .mhead .mcell {
    font-family: var(--font-sans); font-size: 11.5px; font-weight: var(--weight-semibold); letter-spacing: 0.12em;
    text-transform: uppercase; padding: 15px 26px;
  }
  .mhead .mcell:first-child { color: color-mix(in srgb, var(--teal) 70%, var(--limestone)); }
  .mhead .mcell:last-child { color: color-mix(in srgb, var(--steel) 62%, var(--limestone)); }

  /* ============================================================
     EVIDENCE
     ============================================================ */
  .casebox { margin-top: 40px; background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); padding: 40px 44px; min-height: 230px; }
  .case { display: none; }
  .case.on { display: block; }
  .case .fig { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: clamp(34px, 4vw, 46px); color: var(--ink); line-height: 1; letter-spacing: var(--tracking-tight); }
  .case .name { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--teal); margin: 14px 0 16px; }
  .case p { max-width: 74ch; font-size: 15.5px; color: var(--ink-soft); line-height: 1.65; }
  .case .cf { font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-mute); margin-top: 16px; letter-spacing: 0.04em; }
  .dots { margin-top: 26px; display: flex; gap: 12px; align-items: center; }
  .dot { width: 9px; height: 9px; border-radius: 50%; border: 1px solid var(--ink-mute); background: none; cursor: pointer; padding: 0; transition: var(--transition-control); }
  .dot.on { background: var(--teal); border-color: var(--teal); }
  .dots .all { margin-left: 18px; font-size: 13.5px; font-weight: var(--weight-medium); }

  /* ============================================================
     CONTACT / FOOTER
     ============================================================ */
  .contact { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: end; }
  .contact h2 { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: clamp(26px, 2.4vw, 34px); line-height: 1.22; max-width: 22ch; color: var(--ink); }
  .contact p { max-width: 56ch; color: var(--ink-soft); margin-top: 18px; font-size: 16px; line-height: 1.65; }
  .contact .actions { display: flex; flex-direction: column; gap: 14px; align-items: flex-start; width: fit-content; }
  .contact .actions .btn { width: 100%; }
  .contact .actions .email { align-self: flex-start; }
  .contact .email { font-family: var(--font-mono); font-size: 14px; color: var(--teal); letter-spacing: 0.02em; }

  footer.site { background: #26261f; color: #cfccc2; padding: 34px 0; border: none; }
  footer.site .frow { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px; }
  footer.site .wordmark { color: #f6f4ef; font-family: var(--font-serif); font-weight: var(--weight-semibold); font-size: 21px; letter-spacing: 0.01em; display: inline-flex; align-items: baseline; gap: 8px; }
  footer.site .fnote { font-family: var(--font-sans); font-size: 12px; color: #8f8b80; max-width: 56ch; line-height: 1.5; }

  /* ============================================================
     BAND TINTS — two quiet families only. Warm parchment for
     example/urgency/cumulative/CTA; cool gray-green for structural
     surfaces; one ink band for the turn. Kept within a few percent
     of paper so they read as room changes, not color washes.
     ============================================================ */
  .band--warm   { background: color-mix(in srgb, var(--limestone) 52%, var(--amber-tint)); }
  .band--cool   { background: color-mix(in srgb, var(--limestone) 46%, var(--teal-tint)); }
  .band--raised { background: var(--panel); border-top: 1px solid var(--rule); }

  .seclede { font-family: var(--font-sans); font-size: 16.5px; line-height: 1.65; color: var(--ink-soft); margin: 24px 0 0; max-width: 64ch; }
  .secclose { margin-top: 38px; font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 22px; line-height: 1.32; color: var(--ink); max-width: 44ch; }
  .secclose .lit { color: var(--teal); }

  /* ============================================================
     THE QUESTION LEFT OVER — residue grid
     ============================================================ */
  .residue { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 42px; }
  .rcard {
    background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-md);
    padding: 22px 24px 24px;
  }
  .rcard .rk { font-family: var(--font-sans); font-size: 11px; font-weight: var(--weight-semibold); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-mute); }
  .rcard .rq { font-family: var(--font-serif); font-size: 18px; line-height: 1.34; color: var(--ink-soft); margin-top: 11px; }
  .rcard.authority {
    grid-column: 1 / -1; display: grid; grid-template-columns: auto 1fr; gap: 28px; align-items: center;
    border: 1px solid color-mix(in srgb, var(--teal) 34%, var(--rule-soft));
    background: linear-gradient(var(--teal-tint), var(--teal-tint));
    box-shadow: var(--shadow-sm), var(--ring-inset); padding: 26px 30px;
  }
  .rcard.authority .rk { color: var(--teal); }
  .rcard.authority .rq { font-size: 22px; color: var(--ink); max-width: 40ch; margin-top: 0; }
  .rcard.authority .rkwrap { padding-right: 28px; border-right: 1px solid color-mix(in srgb, var(--teal) 24%, transparent); }
  .rcard.authority .rkwrap .nm { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 19px; color: var(--ink); margin-top: 6px; white-space: nowrap; }

  /* ============================================================
     URGENCY — numbered cards
     ============================================================ */
  .ucards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 42px; }
  .ucard {
    background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm); padding: 28px 28px 26px; display: flex; flex-direction: column; gap: 12px;
  }
  .ucard .un { font-family: var(--font-mono); font-size: 12px; color: var(--teal); letter-spacing: 0.08em; }
  .ucard .ut { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 20px; line-height: 1.3; color: var(--ink); text-wrap: balance; min-height: 2.5em; }
  .ucard p { font-size: 14.5px; color: var(--ink-soft); line-height: 1.55; margin: 0; }

  /* ============================================================
     ROTATING EXAMPLE CHIPS
     ============================================================ */
  .rotor { margin-top: 30px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
  .rotor .rlab { font-family: var(--font-sans); font-size: 11.5px; font-weight: var(--weight-semibold); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-mute); }
  .rotor .rchip {
    display: inline-flex; align-items: center; gap: 11px; padding: 8px 9px 8px 16px;
    background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-pill); box-shadow: var(--shadow-xs);
    min-width: 248px;
  }
  .rotor .rchip .ract { font-family: var(--font-mono); font-size: 13px; color: var(--ink-soft); }
  .rotor .rchip .vpill { margin-left: auto; font-size: 10px; }

  /* ============================================================
     CUMULATIVE CONSEQUENCE — rising sequence crossing a limit
     ============================================================ */
  .cumwrap { margin-top: 44px; background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); padding: 34px 36px 30px; }
  .cumchart { position: relative; display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; align-items: end; height: 220px; padding-top: 12px; }
  .limit { position: absolute; left: 0; right: 0; top: 40px; border-top: 1.4px dashed color-mix(in srgb, var(--decision-block) 55%, transparent); }
  .limit span { position: absolute; right: 0; top: -9px; background: var(--panel); padding-left: 10px; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--decision-block); }
  .cumstep { display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; gap: 12px; }
  .cumstep .bar { width: 100%; max-width: 96px; border-radius: var(--radius-sm) var(--radius-sm) 0 0; transition: height var(--dur-slow) var(--ease-standard); }
  .cumstep.s1 .bar { height: 22%; } .cumstep.s2 .bar { height: 40%; } .cumstep.s3 .bar { height: 58%; }
  .cumstep.s4 .bar { height: 74%; } .cumstep.s5 .bar { height: 92%; }
  .cumstep.permit .bar { background: color-mix(in srgb, var(--decision-permit) 26%, var(--panel)); border-top: 2px solid var(--decision-permit); }
  .cumstep.defer .bar  { background: color-mix(in srgb, var(--decision-defer) 28%, var(--panel)); border-top: 2px solid var(--decision-defer); }
  .cumstep.block .bar  { background: color-mix(in srgb, var(--decision-block) 26%, var(--panel)); border-top: 2px solid var(--decision-block); }
  .cumstep .vpill { font-size: 9.5px; }
  .cumaxis { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; margin-top: 14px; }
  .cumaxis span { text-align: center; font-family: var(--font-mono); font-size: 11px; color: var(--ink-mute); }
  .cumnote { margin-top: 28px; font-size: 15px; line-height: 1.65; color: var(--ink-soft); max-width: 70ch; }

  /* ============================================================
     ENTERPRISE GAINS — quiet four-up tiles
     ============================================================ */
  .gains { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: 44px; border-top: 1px solid var(--rule); }
  .gain { padding: 26px 26px 8px 0; }
  .gain + .gain { padding-left: 26px; border-left: 1px solid var(--rule); }
  .gain .gt { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 20px; color: var(--ink); display: flex; align-items: baseline; gap: 10px; }
  .gain .gt::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--teal); flex: none; transform: translateY(-2px); }
  .gain p { font-size: 14px; color: var(--ink-soft); line-height: 1.55; margin: 12px 0 0; }

  /* ============================================================
     PROOF STRIP — compact tiles
     ============================================================ */
  .prooftiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 42px; }
  .ptile { background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-md); box-shadow: var(--shadow-xs); padding: 24px 26px; }
  .ptile .ps { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--teal); display: block; margin-bottom: 10px; }
  .ptile p { font-size: 14px; color: var(--ink-soft); line-height: 1.55; margin: 0; }
  .prooflink { margin-top: 28px; font-size: 14px; font-weight: var(--weight-medium); }

  /* surfaces 2x2 */
  .cards.cards-4 { grid-template-columns: repeat(2, 1fr); }

  /* ============================================================
     RESPONSIVE
     ============================================================ */
  @media (max-width: 980px) {
    .hero-grid { grid-template-columns: 1fr; gap: 44px; }
    .markpanel { order: -1; }
    .cards, .steps { grid-template-columns: 1fr; }
    .incidents { grid-template-columns: 1fr; }
    .incident + .incident { padding-left: 0; border-left: none; border-top: 1px solid var(--rule); padding-top: 20px; }
    .rail { grid-template-columns: 1fr; }
    .node + .node { border-left: none; border-top: 1px solid var(--rule); margin-top: 4px; padding-top: 18px; }
    .node.authority { margin-left: 0; }
    .paths, .arccards { grid-template-columns: 1fr; }
    .guarantees, .glist { grid-template-columns: 1fr; gap: 13px; }
    .decks { gap: 10px; }
    .mrow { grid-template-columns: 1fr; }
    .mcell + .mcell { border-left: none; border-top: 1px solid color-mix(in srgb, var(--limestone) 12%, transparent); }
    .contact { grid-template-columns: 1fr; gap: 28px; align-items: start; }
    .residue, .ucards, .prooftiles { grid-template-columns: 1fr; }
    .rcard.authority { grid-template-columns: 1fr; gap: 14px; }
    .rcard.authority .rkwrap { padding-right: 0; border-right: none; padding-bottom: 14px; border-bottom: 1px solid color-mix(in srgb, var(--teal) 24%, transparent); }
    .cards.cards-4 { grid-template-columns: 1fr; }
    .gains { grid-template-columns: 1fr; }
    .gain + .gain { padding-left: 0; border-left: none; border-top: 1px solid var(--rule); }
    .gain { padding-right: 0; }
    .cumchart { height: 180px; gap: 10px; }
    .cumaxis { gap: 10px; }
    .cumaxis span { font-size: 9.5px; }
  }
  @media (max-width: 900px) {
    /* Nav collapses to the hamburger at the same width as the homepage chrome. */
    .navlinks { display: none; }
    .menu { display: block; }
  }
  @media (max-width: 560px) {
    body { font-size: 16px; }
    .band { padding: var(--band-pad-y-sm) 0; }
  }


  /* ============================================================
     SITE ADDITIONS — shared subpage patterns for the full-site
     build (page heroes, prose, static SVG figures, case wall,
     essay register). Same tokens, no new colors.
     ============================================================ */
  .page-hero { padding: 72px 0 56px; border-bottom: 1px solid var(--rule); }
  .page-hero h1 { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: clamp(34px, 3.8vw, 52px); line-height: var(--leading-tight); letter-spacing: var(--tracking-tight); margin: 18px 0 0; max-width: 22ch; text-wrap: balance; }
  .page-hero .lede { margin-top: 20px; }
  .crumb { font-family: var(--font-sans); font-size: 12.5px; color: var(--ink-mute); letter-spacing: 0.04em; margin-bottom: 10px; }
  .crumb a { color: var(--ink-mute); }
  .crumb a:hover { color: var(--teal); }

  .prose { max-width: 68ch; }
  .prose p { font-size: 16px; line-height: 1.7; color: var(--ink-soft); margin: 18px 0 0; }
  .prose p:first-child { margin-top: 0; }
  .prose h2 { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 27px; line-height: 1.25; margin: 44px 0 0; color: var(--ink); }
  .prose h3 { font-family: var(--font-serif); font-weight: var(--weight-medium); font-size: 21px; line-height: 1.3; margin: 34px 0 0; color: var(--ink); }
  .prose ul, .prose ol { margin: 16px 0 0; padding-left: 22px; color: var(--ink-soft); font-size: 15.5px; line-height: 1.65; display: flex; flex-direction: column; gap: 8px; }
  .prose blockquote { margin: 26px 0 0; padding: 4px 0 4px 22px; border-left: 2px solid var(--teal); font-family: var(--font-serif); font-size: 20px; line-height: 1.4; color: var(--ink); }

  .figure { margin-top: 40px; background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); padding: 30px 32px 24px; }
  .figure svg { width: 100%; height: auto; display: block; }
  .figure figcaption { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em; color: var(--ink-mute); margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--rule-soft); }

  .statustag { display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--decision-defer); border: 1px solid color-mix(in srgb, var(--decision-defer) 40%, transparent); background: var(--decision-defer-tint); border-radius: var(--radius-pill); padding: 3px 10px; }
  .statustag .sdot { width: 5px; height: 5px; border-radius: 50%; background: var(--decision-defer); }

  .twocol { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 36px; }
  .stattable { width: 100%; border-collapse: collapse; margin-top: 24px; background: var(--panel); border: 1px solid var(--rule-soft); border-radius: var(--radius-md); overflow: hidden; }
  .stattable th { font-family: var(--font-sans); font-size: 11.5px; font-weight: var(--weight-semibold); letter-spacing: 0.1em; text-transform: uppercase; text-align: left; color: var(--teal); padding: 14px 20px; border-bottom: 1px solid var(--rule); }
  .stattable td { font-size: 14px; color: var(--ink-soft); line-height: 1.55; padding: 14px 20px; border-bottom: 1px solid var(--rule-soft); vertical-align: top; }
  .stattable tr:last-child td { border-bottom: none; }
  .stattable td b { font-family: var(--font-serif); font-weight: var(--weight-medium); color: var(--ink); font-size: 15.5px; }

  .pagelist { list-style: none; margin: 36px 0 0; padding: 0; display: flex; flex-direction: column; }
  .pagelist li { border-top: 1px solid var(--rule); padding: 24px 0; }
  .pagelist li:last-child { border-bottom: 1px solid var(--rule); }

  .backlink { font-size: 14px; font-weight: var(--weight-medium); }

  /* Binding module (storyboard) */
  .bm-legend button { width: 100%; text-align: left; background: var(--panel); border: 1px solid var(--rule); border-radius: 10px; padding: 11px 13px; cursor: pointer; font-family: inherit; transition: border-color var(--dur-base) var(--ease-standard), background var(--dur-base) var(--ease-standard); }
  .bm-legend button:hover { border-color: #8fb0ae; }
  .bm-legend button[data-sel="true"] { background: var(--teal-tint); border-color: #9dbcba; }
  .bm-legend button[data-sel="true"] .bm-dot { background: var(--teal); }
  .bm-legend button:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }
  .bm-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--rule); flex: none; }
  @keyframes ac-swap { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
  .bm-board { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: stretch; }
  .bm-grid { display: grid; grid-template-columns: minmax(0,1fr) 316px; gap: 28px; margin-top: 36px; align-items: start; }
  @media (max-width: 980px) {
    .bm-grid { grid-template-columns: 1fr; }
    .bm-board { grid-template-columns: 1fr; }
    .bm-board .bm-arrow { transform: rotate(90deg); padding: 6px 0; }
    .twocol { grid-template-columns: 1fr; }
  }

  /* ============================================================
     HERO GATE MARK — the caption "authority boundary" reads as the
     teal boundary line. The three-act packet animation is JS-driven
     (see index.html); it needs no CSS keyframes.
     ============================================================ */
  .caption .lit { color: var(--teal); font-weight: var(--weight-semibold); }

  /* Mobile header fit: at narrow widths the wordmark + CTA + menu exceed the row.
     The CTA collapses into the menu (Request access is the first panel item). */
  @media (max-width: 600px) {
    .navrow { min-height: 56px; }
    .navcta { display: none; }
    .wordmark { font-size: 18px; }
    .wordmark .arc { font-size: 16px; }
  }