/* ============================================================
   BLU3 — blu3print page styles  (pages/blu3print.html only)
   ------------------------------------------------------------
   Reads tokens from styles/tokens.css. Reuses shared chrome from
   styles/subpages-base.css (rv-body, rv-wrap, rv-nav, rv-foot, rv-mark,
   rv-blueprint-bg) and styles/nav.css.

   Consolidated 2026-06: the page-specific rules and the later
   rebuild overrides were merged into this single file (dead rules
   from retired sections removed). bp-* namespace throughout.

   Section map (top → bottom of page):
     :root        · page tokens (ink / blue / paper / rules / spacing)
     bp-hero      · hero + drafting title-block
     bp-why2      · §01 what it is
     bp-inspect   · §02 open to inspect (surface grid)
     bp-walk      · §03 the navigator + the changelog record
     bp-close     · §04 the invitation (dark slab)
     bp-invite    · request-access modal
   ============================================================ */

:root {
  --bp-ink:        #0A0A0B;
  --bp-ink-2:      rgba(10,10,11,0.72);
  --bp-ink-3:      rgba(10,10,11,0.52);
  --bp-ink-4:      rgba(10,10,11,0.32);
  --bp-bg:         #FFFFFF;
  --bp-paper:      #FBFAF7;
  --bp-rule:       rgba(10,10,11,0.12);
  --bp-rule-soft:  rgba(10,10,11,0.06);
  --bp-blue:       #4169E1;
  --bp-blue-deep:  #1F37A5;
  --bp-gutter:     clamp(24px, 5vw, 64px);
  --bp-y-lg:       clamp(56px, 5.8vw, 92px);
  --bp-y-md:       clamp(42px, 4.6vw, 68px);
  --bp-y-sm:       clamp(30px, 3.4vw, 46px);

  --bp-d-line:     rgba(255,255,255,0.16);
  --bp-d-line-2:   rgba(255,255,255,0.10);
  --bp-d-2:        rgba(255,255,255,0.74);
  --bp-d-3:        rgba(255,255,255,0.5);
}
.bp-section { padding-block: var(--bp-y-md); }
.bp-hero {
  position: relative;
  padding-top: clamp(60px, 7vw, 104px);
  padding-bottom: clamp(40px, 5vw, 72px);
  border-bottom: 1px solid var(--bp-rule);
  overflow: hidden;
}
.bp-hero__inner { position: relative; z-index: 2; }
.bp-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(46px, 6.6vw, 104px);
  line-height: 0.95;
  letter-spacing: -0.018em;
  font-kerning: normal;
  color: var(--bp-ink);
  margin: 0;
  text-wrap: balance;
}
.bp-hero__title .l { display: block; }
.bp-hero__title .blue { color: var(--bp-blue); font-weight: 400; }
.bp-hero__title .dot { color: var(--bp-blue); font-weight: 500; }
@media (max-width: 880px) {
.bp-hero__title { font-size: clamp(44px, 11vw, 72px); }
}
.bp-head {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: end;
  margin-bottom: clamp(36px, 4.5vw, 60px);
}
.bp-head .rv-mark { margin: 0 0 clamp(18px, 2.2vw, 26px); }
.bp-head__h {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(33px, 3.5vw, 50px);
  line-height: 1.05;
  letter-spacing: -0.008em;
  font-kerning: normal;
  color: var(--bp-ink);
  margin: 0;
  text-wrap: balance;
}
.bp-head__h .blue { color: var(--bp-blue); font-weight: 400; }
.bp-head__h .dot { color: var(--bp-blue); font-weight: 500; }
.bp-head__dek {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.5;
  letter-spacing: -0.004em;
  color: var(--bp-ink-2);
  margin: 0;
  max-width: 40ch;
  text-wrap: pretty;
}
.bp-head__dek b { color: var(--bp-ink); font-weight: 400; }
.bp-head__dek .blue { color: var(--bp-blue); font-weight: 400; }
@media (max-width: 880px) {
.bp-head { grid-template-columns: 1fr; align-items: start; }
}
.bp-clog {
  background: var(--bp-paper);
  border: 1px solid var(--bp-rule);
  display: flex;
  flex-direction: column;
}
.bp-clog__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--bp-rule);
  background: var(--bp-bg);
}
.bp-clog__bar .file {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--bp-ink);
}
.bp-clog__bar .ver {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--bp-blue);
  border: 1px solid rgba(65,105,225,0.4);
  padding: 3px 8px;
  border-radius: 999px;
}
.bp-clog__body {
  padding: clamp(18px, 2vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.bp-clog__entry {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
}
.bp-clog__date {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--bp-ink-4);
  grid-row: span 2;
  padding-top: 2px;
}
.bp-clog__what {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--bp-ink);
  margin: 0;
}
.bp-clog__what .add { color: var(--bp-blue); font-weight: 400; }
.bp-clog__what .mod { color: var(--bp-ink-2); font-weight: 400; }
.bp-clog__meta {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--bp-ink-3);
  margin: 0;
}
.bp-clog__meta .ok { color: var(--bp-blue); }
.bp-clog__entry + .bp-clog__entry { border-top: 1px solid var(--bp-rule-soft); padding-top: 14px; }
.bp-close {
  position: relative;
  background: var(--bp-ink);
  color: var(--bp-bg);
  padding-block: var(--rv-y-lg);
  overflow: hidden;
}
.bp-close::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right,  rgba(65,105,225,0.10) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(65,105,225,0.10) 1px, transparent 1px),
    radial-gradient(60% 60% at 82% 18%, rgba(65,105,225,0.20) 0%, transparent 62%),
    radial-gradient(46% 46% at 10% 92%, rgba(65,105,225,0.12) 0%, transparent 62%);
  background-size: 80px 80px, 80px 80px, 100% 100%, 100% 100%;
  -webkit-mask-image: linear-gradient(180deg, black 0%, black 78%, transparent 100%);
          mask-image: linear-gradient(180deg, black 0%, black 78%, transparent 100%);
  pointer-events: none;
}
.bp-close > .rv-wrap { position: relative; z-index: 1; }
.bp-close__mark { color: var(--bp-d-3); margin: 0 0 clamp(28px, 3.2vw, 44px); }
.bp-close__mark .n { color: var(--bp-blue); }
.bp-close__mark .r { background: var(--bp-d-line); }
.bp-close__h {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(33px, 4vw, 56px);
  line-height: 1.02;
  letter-spacing: -0.012em;
  font-kerning: normal;
  color: var(--bp-bg);
  margin: 0 0 clamp(24px, 2.8vw, 36px);
  max-width: 16ch;
  text-wrap: balance;
}
.bp-close__h .blue { color: var(--bp-blue); font-weight: 400; }
.bp-close__h .dot { color: var(--bp-blue); font-weight: 500; }
.bp-close__lead {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(17px, 1.6vw, 22px);
  line-height: 1.45;
  letter-spacing: -0.008em;
  color: var(--bp-d-2);
  margin: 0 0 clamp(16px, 1.8vw, 24px);
  max-width: 46ch;
  text-wrap: pretty;
}
.bp-close__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
}
.bp-close__alt {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 15px;
  color: var(--bp-bg);
  border-bottom: 1px solid var(--bp-d-line);
  padding-bottom: 3px;
  transition: color 220ms ease, border-color 220ms ease;
}
.bp-close__alt:hover { color: var(--bp-blue); border-bottom-color: var(--bp-blue); }

/* ------------------------------------------------------------
   Hero re-aim, title-block, why2, inspect, walk, close foundation,
   invite modal (merged from the former blu3print-rebuild.css)
   ------------------------------------------------------------ */
.bp-hero.rv-blueprint-bg::before,
.bp-hero.rv-blueprint-bg::after { content: none; }
.bp-hero { padding-top: clamp(92px, 8vw, 108px); }
[hidden] { display: none !important; }
.bp-clog__what .ret { color: var(--bp-ink-3); font-weight: 400; }
.rv-body a.bp-nav__invite,
.rv-body a.bp-nav__invite:hover { color: var(--bp-ink); }
.bp-nav__invite {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--bp-ink);
  border-bottom: 1px solid var(--bp-ink);
  padding-bottom: 2px;
  cursor: pointer;
  transition: color 220ms ease, border-color 220ms ease;
}
.bp-nav__invite .arr { font-family: var(--font-mono); transition: transform 220ms ease; }
.bp-nav__invite:hover { color: var(--bp-blue); border-bottom-color: var(--bp-blue); }
.bp-nav__invite:hover .arr { transform: translateX(3px); }
.bp-why2__sub {
  margin: 10px 0 0;
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.12em; color: var(--bp-ink-3);
}
@media (max-width: 600px) {
.bp-nav__invite { font-size: 13px; }
}
.rv-body a.bp-close__invite { color: var(--bp-ink); }
.bp-close__lead .blue { color: var(--bp-blue); }
.bp-close__invite {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(15px, 1.4vw, 17px);
  letter-spacing: -0.006em;
  color: var(--bp-ink);
  background: var(--bp-bg);
  border: 1px solid var(--bp-bg);
  border-radius: 2px;
  padding: 15px 26px;
  cursor: pointer;
  transition: background 220ms ease, color 220ms ease, border-color 220ms ease, transform 220ms ease;
}
.bp-close__invite .arr { font-family: var(--font-mono); transition: transform 220ms ease; }
.bp-close__invite:hover {
  background: var(--bp-blue);
  border-color: var(--bp-blue);
  color: var(--bp-bg);
}
.bp-close__invite:hover .arr { transform: translateX(4px); }
.bp-invite {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.bp-invite[hidden] { display: none; }
.bp-invite__scrim {
  position: absolute; inset: 0;
  background: rgba(10,10,11,0.55);
  -webkit-backdrop-filter: blur(2px); backdrop-filter: blur(2px);
}
.bp-invite__dialog {
  position: relative;
  width: min(480px, 100%);
  max-height: calc(100dvh - 48px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--bp-bg);
  border: 1px solid var(--bp-ink);
  border-radius: 2px;
  padding: clamp(28px, 4vw, 44px);
  box-shadow: 0 24px 80px rgba(10,10,11,0.35);
}
@media (prefers-reduced-motion: no-preference) {
.bp-invite__dialog { animation: bp-invite-rise 280ms var(--ease-standard, ease); }
}
.bp-invite__x {
  position: absolute; top: 14px; right: 14px;
  appearance: none; border: 0; background: transparent;
  font-family: var(--font-mono); font-size: 22px; line-height: 1;
  color: var(--bp-ink-4); cursor: pointer; padding: 6px;
  transition: color 200ms ease;
}
.bp-invite__x:hover { color: var(--bp-ink); }
.bp-invite__eb {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--bp-blue); margin: 0 0 14px; font-weight: 500;
}
.bp-invite__h {
  font-family: var(--font-display); font-weight: 300;
  font-size: clamp(28px, 3.4vw, 40px); line-height: 1.0; letter-spacing: -0.01em; font-kerning: normal;
  color: var(--bp-ink); margin: 0 0 16px; text-wrap: balance;
}
.bp-invite__h .blue { color: var(--bp-blue); font-weight: 400; }
.bp-invite__p {
  font-family: var(--font-body); font-weight: 300;
  font-size: 15px; line-height: 1.6; color: var(--bp-ink-2);
  margin: 0 0 22px; text-wrap: pretty;
}
.bp-invite__form { display: flex; flex-direction: column; gap: 12px; }
.bp-invite__row { display: flex; gap: 8px; }
@media (max-width: 460px) {
.bp-invite__row { flex-direction: column; }
}
.bp-invite__hp {
  position: absolute; left: -9999px; width: 1px; height: 1px;
  overflow: hidden; white-space: nowrap;
}
.bp-invite__form input {
  flex: 1; appearance: none;
  background: var(--bp-bg); border: 1px solid var(--bp-rule); border-radius: 2px;
  font-family: var(--font-body); font-weight: 300; font-size: 15px;
  color: var(--bp-ink); padding: 13px 14px;
  transition: border-color 200ms ease, box-shadow 200ms ease;
}
.bp-invite__form input::placeholder { color: var(--bp-ink-4); }
.bp-invite__form input:focus { outline: none; border-color: var(--bp-blue); box-shadow: 0 0 0 3px rgba(65,105,225,0.14); }
.bp-invite__go {
  appearance: none; border: 1px solid var(--bp-ink); background: var(--bp-ink);
  color: var(--bp-bg); font-family: var(--font-display); font-weight: 500; font-size: 15px;
  padding: 0 20px; height: 48px; border-radius: 2px; cursor: pointer; white-space: nowrap;
  transition: background 200ms ease, border-color 200ms ease;
}
.bp-invite__go:hover { background: var(--bp-blue); border-color: var(--bp-blue); }
.bp-invite__note {
  margin: 16px 0 0; font-family: var(--font-display); font-style: italic; font-weight: 300;
  font-size: 13px; color: var(--bp-ink-3);
}
.bp-invite__close-btn {
  margin-top: 4px; appearance: none; border: 1px solid var(--bp-ink); background: transparent;
  color: var(--bp-ink); font-family: var(--font-display); font-weight: 500; font-size: 14px;
  padding: 10px 20px; border-radius: 2px; cursor: pointer;
  transition: background 200ms ease, color 200ms ease;
}
.bp-invite__close-btn:hover { background: var(--bp-ink); color: var(--bp-bg); }
.bp-hero {
  padding-top: clamp(50px, 6vw, 88px);
  padding-bottom: clamp(34px, 4.4vw, 58px);
  min-height: calc(100vh - 409px);
  min-height: calc(100svh - 409px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
@media (max-width: 880px) {
.bp-hero { min-height: auto; }
}
.bp-hero__inner { display: flex; flex-direction: column; width: 100%; }
.bp-hero__mark { margin: 0 0 clamp(24px, 3vw, 40px); }
.bp-hero__title {
  font-size: clamp(44px, 5.6vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.016em;
  max-width: 16ch;
}
.bp-hero__lead {
  margin: clamp(26px, 3vw, 40px) 0 0;
  max-width: 40ch;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(18px, 1.7vw, 24px);
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--bp-ink-2);
  text-wrap: pretty;
}
.bp-titleblock {
  margin: clamp(44px, 5.5vw, 84px) 0 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--bp-ink);
  background: var(--bp-paper);
}
.bp-titleblock__cell {
  padding: clamp(14px, 1.5vw, 18px) clamp(16px, 1.6vw, 22px);
  border-right: 1px solid var(--bp-rule);
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}
.bp-titleblock__cell:last-child { border-right: 0; }
.bp-titleblock dt {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bp-ink-4);
}
.bp-titleblock dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(14px, 1.35vw, 17px);
  letter-spacing: -0.005em;
  color: var(--bp-ink);
  display: flex;
  align-items: center;
  gap: 9px;
  white-space: nowrap;
}
.bp-titleblock__cell--status dd { color: var(--bp-blue); }
.bp-titleblock__ping {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--bp-blue);
  box-shadow: 0 0 0 0 rgba(65,105,225,0.5);
  flex-shrink: 0;
}
@media (prefers-reduced-motion: no-preference) {
.bp-titleblock__ping { animation: bp-ping 2.4s ease-out infinite; }
}
@media (max-width: 720px) {
.bp-titleblock { grid-template-columns: 1fr 1fr; }
.bp-titleblock__cell:nth-child(2) { border-right: 0; }
.bp-titleblock__cell:nth-child(1),
.bp-titleblock__cell:nth-child(2) { border-bottom: 1px solid var(--bp-rule); }
}
@media (max-width: 420px) {
.bp-titleblock { grid-template-columns: 1fr; }
.bp-titleblock__cell { border-right: 0; border-bottom: 1px solid var(--bp-rule); }
.bp-titleblock__cell:last-child { border-bottom: 0; }
}
.bp-why2 { padding-block: var(--bp-y-md); }
.bp-why2 .rv-mark { margin: 0 0 clamp(28px, 3.4vw, 46px); }
.bp-why2 .rv-mark .n { color: var(--bp-blue); }
.bp-why2__top {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 80px);
  align-items: end;
  margin-bottom: clamp(40px, 5vw, 72px);
}
@media (max-width: 860px) {
.bp-why2__top { grid-template-columns: 1fr; gap: clamp(20px, 4vw, 32px); align-items: start; }
}
.bp-section--ruled { border-top: 1px solid var(--bp-rule); background: transparent; }
.bp-why2 .rv-mark { margin: 0 0 clamp(22px, 2.6vw, 34px); }
.bp-why2__top {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: start;
  margin-bottom: clamp(28px, 3.4vw, 48px);
}
.bp-why2__statement {
  margin: 0 0 clamp(14px, 1.6vw, 20px);
  max-width: 15ch;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(34px, 4vw, 58px);
  line-height: 1.02;
  letter-spacing: -0.012em;
  font-kerning: normal;
  color: var(--bp-ink);
  text-wrap: balance;
}
.bp-why2__statement .blue { color: var(--bp-blue); font-weight: 400; }
.bp-why2__aside {
  padding-top: 6px;
  display: flex;
  flex-direction: column;
  gap: clamp(22px, 2.6vw, 32px);
}
.bp-why2__pt {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.bp-why2__pt-lbl {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bp-blue);
}
.bp-why2__pt-lbl::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--bp-blue);
  opacity: 0.55;
}
.bp-why2__claim {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(18px, 1.7vw, 23px);
  line-height: 1.32;
  letter-spacing: -0.014em;
  color: var(--bp-ink);
  text-wrap: pretty;
}
.bp-why2__claim b { font-weight: 500; color: var(--bp-blue); }
@media (max-width: 820px) {
.bp-why2__top { grid-template-columns: 1fr; gap: clamp(20px, 4vw, 28px); }
.bp-why2__statement { max-width: 24ch; }
}
.bp-close__band {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: clamp(36px, 6vw, 88px);
  align-items: center;
}
.bp-close__aside {
  border-left: 1px solid var(--bp-d-line);
  padding-left: clamp(24px, 3vw, 48px);
  padding-block: clamp(4px, 0.6vw, 8px);
}
.bp-close__aside-lbl {
  margin: 0 0 16px;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--bp-blue);
}
.bp-close__list {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 13px;
}
.bp-close__list li {
  position: relative; padding-left: 18px;
  font-family: var(--font-display); font-weight: 300;
  font-size: clamp(15px, 1.3vw, 18px); line-height: 1.35;
  color: rgba(255, 255, 255, 0.82);
}
.bp-close__list li::before {
  content: ""; position: absolute; left: 0; top: 0.58em;
  width: 5px; height: 5px; border-radius: 50%; background: var(--bp-blue);
}
@media (max-width: 760px) {
  .bp-close__band { grid-template-columns: 1fr; gap: clamp(28px, 6vw, 40px); }
  .bp-close__aside { border-left: 0; padding-left: 0; }
}
.bp-close__foundation {
  margin: clamp(44px, 5vw, 72px) 0 0;
  padding-top: clamp(28px, 3.2vw, 40px);
  border-top: 1px solid var(--bp-d-line);
}
.bp-close__credit {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: clamp(14px, 1.6vw, 20px);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(16px, 1.5vw, 20px);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: rgba(255,255,255,0.6);
  text-wrap: pretty;
}
.bp-close__credit-rule {
  flex: none;
  width: clamp(24px, 3vw, 40px);
  height: 1px;
  transform: translateY(-0.35em);
  background: var(--bp-blue);
}
.bp-close__credit .dot { color: var(--bp-blue); font-weight: 500; }
.bp-walk__nav {
  background: var(--bp-ink);
  border-radius: 4px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.bp-walk__nav-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--bp-d-line-2);
}
.bp-walk__nav-bar .dot-r {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--bp-blue);
  box-shadow: 0 0 0 0 rgba(65,105,225,0.5);
  animation: bp-ping 2.4s ease-out infinite;
}
.bp-walk__nav-bar .t {
  font-family: var(--font-mono); font-size: 11px;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--bp-d-2);
}
.bp-walk__nav-bar .ro {
  margin-left: auto;
  font-family: var(--font-mono); font-size: 9px;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--bp-d-3);
  border: 1px solid var(--bp-d-line); border-radius: 2px; padding: 3px 8px;
}
.bp-walk__nav-body {
  padding: clamp(18px, 2vw, 26px);
  display: flex; flex-direction: column; gap: 15px;
}
.bp-walk__ans {
  border-left: 2px solid var(--bp-blue);
  padding-left: 16px;
  display: flex; flex-direction: column; gap: 8px;
}
.bp-walk__ans p { margin: 0; }
.bp-walk__ans p:not(.trace) {
  font-family: var(--font-body); font-weight: 300;
  font-size: 13.5px; line-height: 1.55; color: var(--bp-d-2);
}
.bp-walk__ans .b { color: var(--bp-bg); font-family: var(--font-mono); font-size: 12px; }
.bp-walk__ans .hl { color: #8AA6F5; }
.bp-walk__chips {
  list-style: none; margin: 3px 0 0; padding: 0;
  display: flex; flex-wrap: wrap; gap: 8px;
}
.bp-walk__chips li {
  font-family: var(--font-display); font-weight: 300; font-size: 12.5px;
  color: var(--bp-d-2);
  border: 1px solid var(--bp-d-line); border-radius: 999px;
  padding: 6px 13px;
}
.bp-walk__chips-lbl {
  margin: 4px 0 -4px;
  font-family: var(--font-mono); font-size: 9px;
  letter-spacing: 0.2em; text-transform: uppercase; color: var(--bp-d-3, #6b7280);
}
.bp-walk__nav-cap {
  margin: 0; padding: 11px clamp(18px, 2vw, 26px) 13px;
  border-top: 1px solid var(--bp-d-line);
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 9.5px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--bp-d-3, #6b7280); font-style: normal;
}
.bp-walk__nav-cap span { color: var(--bp-blue); }
.bp-probe__field {
  display: flex; align-items: center; gap: 10px;
  background: rgba(255,255,255,0.035);
  border: 1px solid var(--bp-d-line);
  border-radius: 4px;
  padding: 13px 14px;
  cursor: pointer;
  transition: border-color 200ms ease, background 200ms ease;
}
.bp-probe__field:hover,
.bp-probe__field:focus-visible { border-color: var(--bp-blue); background: rgba(65,105,225,0.06); outline: none; }
.bp-probe__field .cue {
  color: var(--bp-blue); font-family: var(--font-mono); font-weight: 500;
  font-size: 15px; flex-shrink: 0; line-height: 1;
}
.bp-probe__field .q {
  font-family: var(--font-display); font-weight: 300;
  font-size: clamp(15px, 1.5vw, 19px); line-height: 1.3;
  letter-spacing: -0.01em; color: var(--bp-bg);
}
.bp-probe__field .caret {
  width: 2px; height: 1.05em; background: var(--bp-blue);
  display: inline-block; margin-left: 2px; flex-shrink: 0;
  transform: translateY(2px);
  animation: bp-caret 1.05s step-end infinite;
}
.bp-probe__field .run {
  margin-left: auto; flex-shrink: 0;
  font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--bp-d-3);
  border: 1px solid var(--bp-d-line); border-radius: 2px; padding: 4px 9px;
  white-space: nowrap;
  transition: color 200ms ease, border-color 200ms ease;
}
.bp-probe.is-running .bp-probe__field .run { color: #8AA6F5; border-color: rgba(138,166,245,0.45); }
.bp-probe .bp-walk__ans .ml {
  margin-top: 4px; padding-top: 11px;
  border-top: 1px solid var(--bp-d-line-2);
  font-family: var(--font-mono); font-weight: 400;
  font-size: 10.5px; letter-spacing: 0.04em; line-height: 1.65;
  color: var(--bp-d-3); text-transform: none;
}
.bp-probe__out {
  opacity: 0; transform: translateY(6px);
  transition: opacity 320ms ease, transform 320ms ease;
}
.bp-probe.is-answered .bp-probe__out { opacity: 1; transform: none; }
.bp-probe.is-swapping .bp-probe__out { opacity: 0; transform: translateY(4px); transition: opacity 150ms ease, transform 150ms ease; }
.bp-probe__out:empty { display: none; }
.bp-probe__chips { gap: 9px; }
.bp-probe__chips li { border: 0; padding: 0; background: none; }
.bp-probe__chips .chip {
  appearance: none; cursor: pointer; text-align: left;
  font-family: var(--font-display); font-weight: 300; font-size: 12.5px;
  letter-spacing: -0.004em; color: var(--bp-d-2);
  background: transparent;
  border: 1px solid var(--bp-d-line); border-radius: 999px;
  padding: 7px 15px;
  transition: border-color 170ms ease, color 170ms ease, background 170ms ease;
}
.bp-probe__chips .chip:hover,
.bp-probe__chips .chip:focus-visible {
  border-color: var(--bp-blue); color: var(--bp-bg);
  background: rgba(65,105,225,0.1); outline: none;
}
@media (prefers-reduced-motion: reduce) {
.bp-probe__field .caret { animation: none; }
.bp-probe__out { transition: none; }
}
.bp-walk__record { margin-top: clamp(22px, 2.6vw, 34px); }
.bp-walk__record-cap {
  display: flex; align-items: baseline; gap: 8px;
  margin: 0 0 12px;
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--bp-ink-3);
}
.bp-walk__record-cap .ar { color: var(--bp-blue); font-size: 13px; }
.bp-walk__stack {
  max-width: 760px;
  margin: clamp(34px, 4vw, 54px) auto 0;
  display: flex;
  flex-direction: column;
  gap: clamp(30px, 3.6vw, 50px);
}
.bp-walk__stack .bp-walk__record { margin-top: 0; }
.bp-inspect { padding-block: var(--bp-y-md); background: var(--bp-paper); }
/* On warm paper, the white "cutouts" inside the plane diagram must follow the
   section tone so they blend instead of flashing pure white. */
.bp-inspect .bp-plane__tab { background: var(--bp-paper); }
.bp-inspect .bp-plane__node { border-color: var(--bp-paper); }
.bp-inspect__foot {
  margin: clamp(18px, 2vw, 26px) 0 0;
  font-family: var(--font-mono); font-size: 10.5px;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--bp-ink-4);
  display: flex; align-items: center; gap: 9px;
}
.bp-inspect__foot .ar { color: var(--bp-blue); font-size: 13px; }
@keyframes bp-invite-rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes bp-ping {
  0% { box-shadow: 0 0 0 0 rgba(65,105,225,0.45); }
  70%, 100% { box-shadow: 0 0 0 7px rgba(65,105,225,0); }
}
@keyframes bp-caret { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }

/* ============================================================
   §02 · Estate × AI plane — one composition
   ------------------------------------------------------------
   The estate is a row of PILLARS (gray, vertical). The AI layer
   is a single blue axis that CROSSES all of them near the top;
   a node sits where it meets each pillar and a faint drop runs
   down INTO that pillar — AI threading through the estate. The
   whole plane is framed as one tenant: the blu3print, "where
   they meet." Each crossing is an agent.
   ============================================================ */
.bp-plane {
  margin: clamp(40px, 5.5vw, 78px) 0 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* — the AI dimension, entering from the top — */
.bp-plane__ai { text-align: center; }
.bp-plane__ai-lbl {
  margin: 0;
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--bp-blue);
}
.bp-plane__ai-lbl span { color: rgba(65,105,225,0.4); font-weight: 400; }
.bp-plane__ai-lbl i {
  font-style: normal; letter-spacing: 0.16em; color: rgba(65,105,225,0.6);
}
.bp-plane__ai-list {
  margin: 9px 0 0;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.14em;
  text-transform: uppercase; color: rgba(65, 105, 225, 0.6);
}
.bp-plane__enter {
  display: block; width: 1px; height: clamp(20px, 2.6vw, 30px);
  margin: clamp(12px, 1.6vw, 16px) auto 0;
  background: linear-gradient(var(--bp-blue), rgba(65,105,225,0.15));
}

/* — the frame: one tenant — */
.bp-plane__frame {
  position: relative;
  width: 100%;
  border: 1px solid var(--bp-rule);
  padding: clamp(40px, 5vw, 62px) clamp(20px, 3.4vw, 46px) clamp(22px, 2.6vw, 32px);
}
.bp-plane__tab {
  position: absolute; top: 0; left: clamp(18px, 3vw, 34px);
  transform: translateY(-50%);
  background: var(--bp-bg); padding: 0 12px;
  font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--bp-ink-3);
}

/* — the AI axis line crossing the frame — */
.bp-plane__axis {
  position: absolute; left: clamp(20px, 3.4vw, 46px); right: clamp(20px, 3.4vw, 46px);
  top: clamp(40px, 5vw, 62px);
}
.bp-plane__axis-line {
  display: block; height: 1.5px; width: 100%;
  background: linear-gradient(90deg, var(--bp-blue) 78%, rgba(65,105,225,0.15));
}
.bp-plane__axis-tag {
  position: absolute; right: 0; bottom: 100%; margin-bottom: 7px;
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.18em;
  text-transform: uppercase; color: rgba(65,105,225,0.7); white-space: nowrap;
}

/* — the estate pillars — */
.bp-plane__pillars {
  position: relative; z-index: 1;
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, 1fr);
  column-gap: clamp(20px, 3vw, 44px);
}
.bp-plane__pillar {
  display: flex; flex-direction: column; align-items: flex-start;
}
.bp-plane__node {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--bp-blue); border: 2px solid var(--bp-bg);
  box-shadow: 0 0 0 4px rgba(65,105,225,0.12);
  margin-top: -5.5px;            /* center the node on the axis line */
}
.bp-plane__drop {
  width: 1px; height: clamp(20px, 2.8vw, 30px);
  margin: 6px 0 0 5px;
  background: linear-gradient(rgba(65,105,225,0.55), rgba(65,105,225,0.08));
}
.bp-plane__pname {
  margin: clamp(13px, 1.5vw, 17px) 0 0;
  font-family: var(--font-display); font-weight: 400;
  font-size: clamp(18px, 1.7vw, 23px); letter-spacing: -0.016em; line-height: 1; color: var(--bp-ink);
}
.bp-plane__pwhat {
  margin: 7px 0 0;
  font-family: var(--font-body); font-weight: 300;
  font-size: clamp(12.5px, 1vw, 14px); line-height: 1.5; color: var(--bp-ink-2); text-wrap: pretty;
}

/* — the estate baseline — */
.bp-plane__base {
  margin-top: clamp(26px, 3vw, 38px);
  display: grid; grid-template-columns: auto 1fr auto; align-items: center;
  gap: clamp(12px, 2vw, 20px);
}
.bp-plane__base-rule { height: 1px; background: var(--bp-rule); }
.bp-plane__base-lbl {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--bp-ink-3); white-space: nowrap;
}
.bp-plane__base-lbl--r { color: var(--bp-ink-4); }

@media (max-width: 720px) {
  .bp-plane__axis { display: none; }                 /* node-per-pillar carries the idea on small screens */
  .bp-plane__pillars { grid-template-columns: repeat(2, 1fr); row-gap: clamp(22px, 5vw, 30px); }
  .bp-plane__node { margin-top: 0; }
  .bp-plane__frame { padding-top: clamp(30px, 6vw, 40px); }
}
@media (max-width: 430px) {
  .bp-plane__pillars { grid-template-columns: 1fr; }
  .bp-plane__base-lbl { font-size: 9px; letter-spacing: 0.14em; }
}