/* PERSPICAZITY / ANTAEUS — instrument sheet
   Base: cold paper. Ink: carbon. One signal: #D97736. Zero radius. Hairlines only. */

@font-face { font-family: "Plex Cond"; src: url("../fonts/ibm-plex-sans-condensed-latin-700.woff2") format("woff2"); font-weight: 700; font-display: swap; }
@font-face { font-family: "Plex Cond"; src: url("../fonts/ibm-plex-sans-condensed-latin-600.woff2") format("woff2"); font-weight: 600; font-display: swap; }
@font-face { font-family: "Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-400.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-500.woff2") format("woff2"); font-weight: 500; font-display: swap; }
@font-face { font-family: "Plex Sans"; src: url("../fonts/ibm-plex-sans-latin-600.woff2") format("woff2"); font-weight: 600; font-display: swap; }
@font-face { font-family: "Plex Mono"; src: url("../fonts/ibm-plex-mono-latin-400.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Plex Mono"; src: url("../fonts/ibm-plex-mono-latin-500.woff2") format("woff2"); font-weight: 500; font-display: swap; }

:root {
  /* Palantir-white body, dark hero. Clean cool paper, carbon ink, one signal. */
  --paper: #F4F5F6;
  --paper-inset: #EAECEE;
  --ink: #16181A;
  --ink-70: rgba(22, 24, 26, 0.70);
  --ink-45: rgba(22, 24, 26, 0.46);
  --hairline: rgba(22, 24, 26, 0.16);
  --hairline-soft: rgba(22, 24, 26, 0.09);
  --signal: #D97736;
  --signal-deep: #B85E22;
  /* void tokens for the dark hero band */
  --void: #0B0C0E;
  --void-ink: #E4E7EB;
  --void-muted: #9098A1;
  --void-hair: #2A2F34;
  --head-h: 3.75rem;
  --display: "Plex Cond", "Arial Narrow", sans-serif;
  --body: "Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --mono: "Plex Mono", "SFMono-Regular", Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--signal); color: var(--paper); }

.shell { max-width: 1504px; margin-inline: auto; padding-inline: clamp(1.25rem, 4vw, 3rem); }
.mono {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--ink-70);
  font-variant-numeric: tabular-nums;
}

/* ---------- accessibility ---------- */
.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: 0.6rem 1rem; z-index: 99; font-family: var(--mono); font-size: 0.8rem;
}
.skip:focus { left: 0; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }

/* ---------- header ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: transparent; border-bottom: 1px solid transparent;
  transition: background 220ms ease, border-color 220ms ease;
}
/* translucent glass nav while over the dark hero */
.site-head:not(.solid) { background: rgba(11, 12, 14, 0.30); backdrop-filter: blur(7px); }
.site-head.solid {
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(8px); border-bottom-color: var(--hairline);
}
/* light nav over the dark hero; carbon nav once scrolled onto the white body */
.site-head:not(.solid) .wordmark { color: var(--void-ink); }
.site-head:not(.solid) nav a, .site-head:not(.solid) .nav-drop-btn { color: var(--void-muted); }
.site-head:not(.solid) nav a:hover, .site-head:not(.solid) .nav-drop-btn:hover { color: var(--void-ink); }
.site-head:not(.solid) .head-register { color: var(--void-muted); border-left-color: var(--void-hair); }
.head-row { display: flex; align-items: center; gap: 1.5rem; height: 3.75rem; }
.wordmark {
  position: relative; padding-left: 1.05rem;
  font-family: var(--display); font-weight: 700; font-size: 1.05rem;
  letter-spacing: 0.14em; color: var(--ink); text-decoration: none;
}
/* engine "online" diode — the only orange in the nav */
.wordmark::before {
  content: ""; position: absolute; left: 0; top: 50%; width: 6px; height: 6px;
  margin-top: -3px; background: var(--signal);
  box-shadow: 0 0 7px rgba(217, 119, 54, 0.75);
  animation: diode 3.2s ease-in-out infinite;
}
@keyframes diode { 0%, 100% { opacity: 1; } 50% { opacity: 0.45; } }
.head-register { border-left: 1px solid var(--hairline); padding-left: 1.5rem; }
.site-head nav { margin-left: auto; display: flex; gap: 1.75rem; align-items: center; }
.site-head nav a {
  color: var(--ink-70); text-decoration: none; font-size: 0.875rem; font-weight: 500;
}
.site-head nav a:hover { color: var(--ink); }

/* nav dropdown */
.nav-drop { position: relative; }
.nav-drop-btn {
  display: inline-flex; align-items: center; gap: 0.45rem;
  background: none; border: none; cursor: pointer; padding: 0;
  font-family: var(--body); font-size: 0.875rem; font-weight: 500; color: var(--ink-70);
}
.nav-drop-btn:hover { color: var(--ink); }
.drop-caret { font-size: 0.55rem; color: var(--ink-45); transition: transform 150ms ease; }
.nav-drop.open .drop-caret, .nav-drop:hover .drop-caret { transform: rotate(180deg); }
/* invisible bridge so hover survives the gap between button and panel */
.nav-drop::after { content: ""; position: absolute; top: 100%; left: 0; right: 0; height: 1.4rem; }
.drop-panel {
  display: none; position: absolute; top: calc(100% + 1.3rem); left: 0;
  min-width: 21rem; background: var(--paper);
  border: 1px solid var(--hairline); z-index: 60;
}
.nav-drop.open .drop-panel, .nav-drop:hover .drop-panel, .nav-drop:focus-within .drop-panel { display: block; }
.drop-item {
  display: grid; grid-template-columns: 2.25rem 1fr; gap: 0.75rem; align-items: baseline;
  padding: 1.05rem 1.15rem; text-decoration: none; color: var(--ink);
}
.drop-item:hover { background: var(--paper-inset); }
.drop-no { color: var(--ink-45); }
.drop-item strong { display: block; font-family: var(--display); font-weight: 700; font-size: 0.95rem; letter-spacing: 0.07em; }
.drop-item small { display: block; margin-top: 0.3rem; font-size: 0.8rem; color: var(--ink-70); }
.head-cta { margin-left: 0.25rem; }

/* ---------- buttons ---------- */
.btn {
  display: inline-block; text-decoration: none; cursor: pointer;
  font-family: var(--body); font-weight: 600; font-size: 0.875rem;
  padding: 0.7rem 1.4rem; border: 1px solid var(--ink);
  color: var(--ink); background: transparent; border-radius: 0;
}
.btn-signal { background: var(--signal); border-color: var(--signal); color: #0B0C0E; font-weight: 600; }
.btn-signal:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn-quiet:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ---------- hero (the one dark band; fades into the white body) ---------- */
.hero {
  position: relative; overflow: hidden; background: var(--void); color: var(--void-ink);
  /* extend up BEHIND the sticky header so the translucent nav reads on the void */
  margin-top: calc(-1 * var(--head-h));
  padding-block: calc(var(--head-h) + clamp(4rem, 9vw, 7rem)) clamp(5rem, 10vw, 8rem);
}
.recon { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; }
.hero .shell { position: relative; z-index: 1; }
.hero .eyebrow { color: var(--void-muted); }
.hero h1 { color: var(--void-ink); }
.hero .lede { color: #AEB4BC; }
.hero .btn-quiet { border-color: var(--signal); color: var(--signal); }
.hero .btn-quiet:hover { background: var(--signal); color: var(--void); border-color: var(--signal); }
.hero::after { /* dissolve the void into the white body — reaches up toward the button,
                  but holds transparent at the top so the lede stays legible */
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 16%; z-index: 0;
  background: linear-gradient(to bottom, transparent, transparent 55%, var(--paper)); pointer-events: none;
}
.eyebrow { display: block; margin-bottom: 2rem; }
h1 {
  font-family: var(--body); font-weight: 400;
  font-size: clamp(2.9rem, 6.6vw, 5.5rem);
  line-height: 1.03; letter-spacing: -0.03em;
  max-width: 20ch;
}
h1.h1-tagline {
  font-weight: 400;
  font-size: clamp(2.5rem, 5.6vw, 4.7rem);
  line-height: 1.05; letter-spacing: -0.028em; max-width: 24ch;
}
.lede {
  margin-top: 2rem; max-width: 58ch;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem); line-height: 1.6; color: var(--ink-70);
}
.cta-row { margin-top: 2.5rem; display: flex; gap: 1rem; flex-wrap: wrap; }

/* ---------- the ledger (signature) ---------- */
.ledger { margin-top: clamp(4rem, 8vw, 6.5rem); border: 1px solid var(--hairline); }
.ledger .mono, .obs-value.refusal { overflow-wrap: anywhere; }
.ledger-cap {
  display: block; padding: 0.7rem 1.25rem;
  border-bottom: 1px solid var(--hairline);
  color: var(--ink-45);
}
.ledger-head {
  display: grid; grid-template-columns: 1fr 1.6fr;
  border-bottom: 1px solid var(--hairline);
}
.ledger-head span { padding: 0.6rem 1.25rem; }
.ledger-head span + span { border-left: 1px solid var(--hairline); }

.ledger-row { display: grid; grid-template-columns: 1fr 1.6fr; }
.ledger-row + .ledger-row { border-top: 1px solid var(--hairline); }
.ledger-axis {
  grid-column: 1 / -1; padding: 0.85rem 1.25rem 0;
  color: var(--ink-45); letter-spacing: 0.06em;
}
.cell { padding: 1rem 1.25rem 1.5rem; min-width: 0; }
.cell.observed { border-left: 1px solid var(--hairline); }
.stated-line { color: var(--ink-45); font-size: 0.95rem; }
.cell-meta { display: block; margin-top: 0.6rem; color: var(--ink-45); }

.obs-value .num {
  font-family: var(--display); font-weight: 700; font-size: 2.4rem;
  line-height: 1; font-variant-numeric: tabular-nums; letter-spacing: 0.01em;
}
.obs-band { display: inline-block; margin-left: 0.75rem; color: var(--ink-70); }

/* provenance trace: hover/focus routes value -> receipt */
.trace { width: 1px; height: 1.6rem; margin: 0.6rem 0 0.6rem 0.35rem; background: var(--hairline); transition: background-color 120ms linear; }
.receipt { border-left: 1px solid var(--hairline); padding-left: 1rem; margin-left: 0.35rem; transition: border-color 120ms linear; }
.receipt-tick { color: var(--ink-70); }
.tick { color: var(--ink-45); transition: color 120ms linear; }
.hash {
  display: block; margin-top: 0.4rem; letter-spacing: 0.02em;
  color: var(--ink-70); overflow-wrap: anywhere; user-select: all;
}
.ledger-row:hover .trace, .ledger-row:focus-within .trace, .ledger-row:focus .trace { background: var(--signal); }
.ledger-row:hover .receipt, .ledger-row:focus-within .receipt, .ledger-row:focus .receipt { border-left-color: var(--signal); }
.ledger-row:hover .tick, .ledger-row:focus-within .tick, .ledger-row:focus .tick { color: var(--signal); }

.obs-value.refusal {
  font-size: 0.95rem; font-weight: 500; letter-spacing: 0.12em; color: var(--ink);
  padding-top: 0.5rem;
}
.refusal-line { margin-top: 0.5rem; color: var(--ink-45); font-size: 0.95rem; max-width: 44ch; }

.ledger-foot {
  display: block; padding: 0.7rem 1.25rem;
  border-top: 1px solid var(--hairline); color: var(--ink-45);
}

/* ---------- sections ---------- */
.sec { border-top: 1px solid var(--hairline); padding-block: clamp(4.5rem, 9vw, 8rem); }
.register {
  display: flex; justify-content: space-between; gap: 1rem;
  margin-bottom: clamp(2.5rem, 5vw, 4rem); color: var(--ink-45);
}
.register span:last-child { text-align: right; }
h2 {
  font-family: var(--display); font-weight: 700;
  font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.05;
  max-width: 24ch; letter-spacing: -0.003em;
}
.sec-lede { margin-top: 1.25rem; max-width: 58ch; color: var(--ink-70); }
h3 { font-family: var(--body); font-weight: 600; font-size: 1.05rem; }

.cols {
  margin-top: 2.5rem; display: grid; gap: clamp(2rem, 4vw, 4rem);
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  max-width: 76rem;
}
.cols p { color: var(--ink-70); max-width: 55ch; }

.tagline { margin-top: clamp(3rem, 6vw, 5rem); border-left: 1px solid var(--hairline); padding-left: 1.75rem; }
.tagline p {
  font-family: var(--display); font-weight: 600;
  font-size: clamp(1.15rem, 2.2vw, 1.55rem); line-height: 1.3; max-width: 34ch;
}

/* ---------- mechanism ---------- */
.mech { margin-top: 3rem; border-top: 1px solid var(--hairline); }
.mech-item {
  display: grid; grid-template-columns: minmax(220px, 1fr) 2fr; gap: 1rem 3rem;
  padding-block: 1.9rem; border-bottom: 1px solid var(--hairline);
}
.mech-item dt { font-weight: 600; font-size: 1.05rem; }
.mech-reg { display: block; margin-bottom: 0.5rem; color: var(--ink-45); }
.mech-item dd { color: var(--ink-70); max-width: 58ch; }
.mech-item code, .notes code {
  font-family: var(--mono); font-size: 0.85em;
  background: var(--paper-inset); padding: 0.1em 0.35em;
}
.name-note { display: block; margin-top: 2.5rem; max-width: 72ch; line-height: 1.9; color: var(--ink-45); }

/* ---------- payload ---------- */
.payload-wrap {
  margin-top: 3rem; display: grid; gap: 1.5rem;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 1fr);
  align-items: start;
}
.codeblock { border: 1px solid var(--hairline); background: var(--paper-inset); min-width: 0; }
.code-head { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding: 0.7rem 1.25rem; border-bottom: 1px solid var(--hairline); color: var(--ink-70); }
.code-tag { color: var(--ink-45); }
.codeblock pre { padding: 1.25rem; overflow: auto; max-height: 38rem; }
.codeblock code {
  font-family: var(--mono); font-size: 0.8rem; line-height: 1.7;
  font-variant-numeric: tabular-nums; color: var(--ink);
}
.codeblock span[data-note] { display: inline; border-left: 2px solid transparent; margin-left: -1.25rem; padding-left: calc(1.25rem - 2px); transition: border-color 120ms linear, background-color 120ms linear; }
.codeblock span[data-note].lit { border-left-color: var(--signal); background: rgba(217, 119, 54, 0.08); }

.notes { list-style: none; border-left: 1px solid var(--hairline); }
.notes li {
  display: grid; grid-template-columns: 2rem 1fr; gap: 0.75rem;
  padding: 1rem 0.75rem 1rem 1rem; border-top: 1px solid var(--hairline-soft);
  border-left: 1px solid transparent; margin-left: -1px;
  cursor: default; transition: border-color 120ms linear;
}
.notes li.lit { border-left-color: var(--signal); }
.notes li:first-child { border-top: 1px solid var(--hairline); }
.notes li:last-child { border-bottom: 1px solid var(--hairline); }
.note-key {
  display: inline-flex; align-items: center; justify-content: center;
  width: 1.5rem; height: 1.5rem; border: 1px solid var(--hairline);
  color: var(--ink-70); transition: all 120ms linear;
}
.notes li.lit .note-key { background: var(--signal); border-color: var(--signal); color: #14100C; }
.notes li p { font-size: 0.9rem; color: var(--ink-70); line-height: 1.55; }

/* ---------- instruments register ---------- */
.inst-list { margin-top: 3rem; border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.inst-row {
  display: grid; grid-template-columns: 4rem minmax(0, 1fr) auto 3rem;
  gap: 1rem 2rem; align-items: baseline;
  padding: 2rem 0.5rem; text-decoration: none; color: var(--ink);
}
.inst-no { font-size: 1rem; color: var(--ink-45); }
.inst-body h3 { font-family: var(--display); font-weight: 700; font-size: 1.5rem; letter-spacing: 0.06em; }
.inst-body p { margin-top: 0.5rem; color: var(--ink-70); max-width: 62ch; font-size: 0.95rem; }
.inst-status { color: var(--ink-45); white-space: nowrap; }
.inst-arrow { font-size: 1.3rem; color: var(--ink-45); transition: transform 150ms ease, color 150ms ease; justify-self: end; }
.inst-row:hover .inst-arrow, .inst-row:focus-visible .inst-arrow { transform: translateX(0.4rem); color: var(--signal); }
.inst-row:hover .inst-body h3 { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 4px; }

.method-link { color: var(--ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.method-link:hover { color: var(--signal-deep); }

/* ---------- deliverable: endpoint table ---------- */
.api-block { margin-top: 3rem; border: 1px solid var(--hairline); background: var(--paper); }
.api-scroll { overflow-x: auto; }
.api-table { width: 100%; border-collapse: collapse; }
.api-table td { padding: 1.1rem 1.25rem; vertical-align: baseline; }
.api-table tr + tr td { border-top: 1px solid var(--hairline-soft); }
.api-verb { color: var(--ink-45); width: 3rem; letter-spacing: 0.08em; }
.api-path { white-space: nowrap; font-size: 0.8rem; color: var(--ink); }
.api-desc { font-size: 0.9rem; color: var(--ink-70); min-width: 18rem; }

/* ---------- pricing tiers ---------- */
.tiers { margin-top: 3rem; display: grid; gap: 1.5rem; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.tier { border: 1px solid var(--hairline); background: var(--paper); padding: 1.75rem 1.75rem 2rem; display: flex; flex-direction: column; }
.tier-reg { color: var(--ink-45); }
.tier-name { font-family: var(--display); font-weight: 700; font-size: 1.25rem; letter-spacing: 0.06em; margin-top: 0.9rem; }
.tier-price { margin-top: 1.4rem; display: flex; align-items: baseline; gap: 0.5rem; }
.price-num { font-family: var(--display); font-weight: 700; font-size: 2.4rem; line-height: 1; font-variant-numeric: tabular-nums; letter-spacing: 0.01em; }
.price-per { color: var(--ink-45); }
.tier-list { list-style: none; margin-top: 1.6rem; margin-bottom: 2rem; }
.tier-list li { padding: 0.6rem 0; border-top: 1px solid var(--hairline-soft); font-size: 0.9rem; color: var(--ink-70); line-height: 1.5; }
.tier-list li:last-child { border-bottom: 1px solid var(--hairline-soft); }
.tier-cta { margin-top: auto; align-self: flex-start; }
.tiers-foot { display: block; margin-top: 2rem; color: var(--ink-45); }
@media (max-width: 960px) { .tiers { grid-template-columns: 1fr; } }

/* ---------- who ---------- */
.who { margin-top: 3rem; list-style: none; border-top: 1px solid var(--hairline); }
.who li {
  display: grid; grid-template-columns: minmax(220px, 1fr) 2fr; gap: 0.5rem 3rem;
  padding-block: 1.6rem; border-bottom: 1px solid var(--hairline);
}
.who p { color: var(--ink-70); max-width: 58ch; }
.later { letter-spacing: 0.1em; color: var(--ink-45); }

/* ---------- principles ---------- */
/* auditor's ledger — no boxes, full-bleed hairline rules, tag in the gutter */
.constitution {
  margin-top: 3rem; list-style: none;
  border-top: 1px solid var(--hairline);
}
.constitution li {
  display: grid; grid-template-columns: minmax(170px, 1fr) 3fr; gap: 0.4rem 3rem;
  padding-block: 1.7rem; border-bottom: 1px solid var(--hairline);
}
.p-reg { grid-row: 1 / span 2; grid-column: 1; align-self: start; color: var(--ink-45); }
.constitution h3 { grid-column: 2; margin-bottom: 0.4rem; }
.constitution p { grid-column: 2; font-size: 0.95rem; color: var(--ink-70); line-height: 1.55; max-width: 60ch; }
@media (max-width: 640px) {
  .constitution li { grid-template-columns: 1fr; gap: 0.5rem; }
  .p-reg { grid-row: auto; grid-column: 1; } .constitution h3, .constitution p { grid-column: 1; }
}

/* ---------- access drawer ---------- */
#access-drawer {
  position: fixed; inset: 0 0 0 auto;
  width: min(620px, 100vw); max-width: 100vw;
  height: 100vh; height: 100dvh; max-height: 100vh; max-height: 100dvh;
  margin: 0; padding: 0; border: none; border-left: 1px solid var(--hairline);
  background: var(--paper); color: var(--ink);
}
#access-drawer::backdrop { background: rgba(23, 25, 27, 0.45); }
#access-drawer[open] { animation: drawer-in 320ms cubic-bezier(0.2, 0.7, 0.2, 1); }
#access-drawer[open]::backdrop { animation: backdrop-in 320ms linear; }
@keyframes drawer-in { from { transform: translateX(100%); } to { transform: none; } }
@keyframes backdrop-in { from { opacity: 0; } to { opacity: 1; } }
.drawer-inner { height: 100%; overflow-y: auto; padding: clamp(1.5rem, 4vw, 3rem); }
.drawer-close {
  background: transparent; border: none; cursor: pointer; color: var(--ink);
  font-size: 1.6rem; line-height: 1; padding: 0.25rem 0.6rem; margin: -0.25rem 0 2rem -0.6rem;
  display: block;
}
.drawer-close:hover { color: var(--signal-deep); }
.drawer-register { margin-bottom: 2.5rem; }
#access-drawer h2 { max-width: none; }

.access-form { margin-top: 2.5rem; display: grid; grid-template-columns: 1fr; gap: 2rem; }
.field { display: flex; flex-direction: column; gap: 0.6rem; }
.field label { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-70); }
.field input, .field textarea {
  font-family: var(--body); font-size: 1rem; color: var(--ink);
  background: transparent; border: none; border-bottom: 1px solid var(--hairline); border-radius: 0;
  padding: 0.6rem 0; resize: vertical;
}
.field input:hover, .field textarea:hover { border-bottom-color: var(--ink-70); }
.field input:focus, .field textarea:focus { border-bottom-color: var(--ink); outline: none; }
.field input:focus-visible, .field textarea:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }
/* drawer: tier + organization type */
.tier-field { border: none; padding: 0; margin: 0; min-width: 0; }
.tier-field legend { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-70); padding: 0; margin-bottom: 0.6rem; }
.tier-radios { display: flex; flex-wrap: wrap; gap: 0.75rem 1.75rem; padding-top: 0.2rem; }
.radio { display: inline-flex; align-items: center; gap: 0.55rem; font-size: 0.95rem; color: var(--ink); cursor: pointer; }
.radio input { accent-color: var(--signal); width: 0.95rem; height: 0.95rem; margin: 0; cursor: pointer; }
.field select {
  font-family: var(--body); font-size: 1rem; color: var(--ink);
  background: transparent; border: none; border-bottom: 1px solid var(--hairline); border-radius: 0;
  padding: 0.6rem 0; cursor: pointer;
}
.field select:hover { border-bottom-color: var(--ink-70); }
.field select:focus { border-bottom-color: var(--ink); outline: none; }
.field select:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }
.form-error { color: var(--signal-deep); letter-spacing: 0.04em; }
.access-form .btn { justify-self: start; margin-top: 0.5rem; }
.form-done { border: 1px solid var(--hairline); padding: 1.5rem; color: var(--ink-70); }
body.drawer-open { overflow: hidden; }

/* ---------- footer ---------- */
.site-foot { border-top: 1px solid var(--hairline); }
.foot-row {
  display: flex; justify-content: space-between; align-items: baseline; gap: 1rem;
  padding-block: 2.25rem; flex-wrap: wrap;
}
.site-foot .mono { color: var(--ink-45); }

/* ---------- motion ---------- */
.reveal { opacity: 0; transform: translateY(10px); transition: opacity 500ms ease, transform 500ms ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { transition-duration: 0.01ms !important; animation: none !important; }
}
/* no-JS safety */
.no-observer .reveal { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 960px) {
  .payload-wrap { grid-template-columns: 1fr; }
  .mech-item, .who li { grid-template-columns: 1fr; gap: 0.6rem; }
}
@media (max-width: 760px) {
  .head-register, .site-head nav { display: none; }
  .head-row { gap: 0.75rem; height: 3.25rem; }
  .wordmark { font-size: 0.95rem; letter-spacing: 0.1em; }
  .head-cta { margin-left: auto; padding: 0.5rem 0.9rem; font-size: 0.8rem; }
  /* ledger stays a comparative grid on mobile — tightened, never stacked */
  .ledger-head { display: none; }
  .ledger-row { grid-template-columns: 1fr 1.3fr; }
  .ledger-cap, .ledger-foot { padding: 0.6rem 0.85rem; }
  .ledger-axis { padding: 0.75rem 0.85rem 0; }
  .cell { padding: 0.85rem 0.85rem 1.1rem; }
  .obs-value .num { font-size: 1.7rem; }
  .obs-band { display: block; margin-left: 0; margin-top: 0.5rem; }
  .obs-value.refusal { font-size: 0.8rem; letter-spacing: 0.06em; }
  .receipt { padding-left: 0.7rem; }
  .cell.stated::before { content: "STATED"; font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.08em; color: var(--ink-45); display: block; margin-bottom: 0.5rem; }
  .cell.observed::before { content: "OBSERVED"; font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.08em; color: var(--ink-45); display: block; margin-bottom: 0.5rem; }
  .register { flex-direction: column; gap: 0.35rem; }
  .register span:last-child { text-align: left; }
  #access-drawer { width: 100vw; border-left: none; }
  .inst-row { grid-template-columns: 2.5rem minmax(0, 1fr); }
  .inst-status { grid-column: 2; }
  .inst-arrow { display: none; }
}

/* ---------- light-page variant (antaeus): no dark hero, all paper ---------- */
body.light .site-head {
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(8px); border-bottom-color: var(--hairline);
}
body.light .site-head .wordmark { color: var(--ink); }
body.light .site-head nav a, body.light .site-head .nav-drop-btn { color: var(--ink-70); }
body.light .site-head nav a:hover, body.light .site-head .nav-drop-btn:hover { color: var(--ink); }
body.light .site-head .head-register { color: var(--ink-45); border-left-color: var(--hairline); }

body.light .hero {
  background: var(--paper); color: var(--ink);
  border-bottom: 1px solid var(--hairline);
}
body.light .hero .eyebrow { color: var(--ink-45); }
body.light .hero h1 { color: var(--ink); }
body.light .hero .lede { color: var(--ink-70); }
body.light .hero .btn-quiet { border-color: var(--ink); color: var(--ink); }
body.light .hero .btn-quiet:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
body.light .hero::after { display: none; }

/* ---------- logo wordmark in header (replaces the text wordmark) ---------- */
.wordmark-logo { padding-left: 0; display: inline-flex; align-items: center; height: 100%; }
.wordmark-logo::before { display: none; }              /* drop the diode dot — the mark carries the node */
.wordmark-logo .wm { height: 0.85rem; width: auto; display: block; }  /* word-only — matched to the original lockup's word size */
.wordmark-logo .wm-dark { display: none; }
/* white logo over the dark hero; color logo once scrolled onto the white body */
.site-head.solid .wordmark-logo .wm-light { display: none; }
.site-head.solid .wordmark-logo .wm-dark  { display: block; }
/* antaeus (always-light page): always the color logo */
body.light .wordmark-logo .wm-light { display: none; }
body.light .wordmark-logo .wm-dark  { display: block; }
@media (max-width: 640px) { .wordmark-logo .wm { height: 0.8rem; } }