/* ============================================================
   MESA STRATA — practice site layout
   Visual decisions all derive from the bound design system tokens.
   This file is layout + composition only (no new colors / type).
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }

body {
  margin: 0;
  background: var(--surface-canvas);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: var(--leading-body);
}

::selection { background: var(--ms-terracotta); color: var(--ms-bone); }

a { color: inherit; }

/* ---- Page container : generous editorial margins, capped measure ---- */
.wrap {
  width: min(84%, 1200px);
  margin-inline: auto;
}

/* ============================================================
   MASTHEAD
   ============================================================ */
.masthead {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--surface-canvas) 88%, transparent);
  backdrop-filter: saturate(1) blur(2px);
  border-bottom: 1px solid var(--rule-strong);
}
.masthead__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 20px;
}
.masthead__brand { text-decoration: none; display: inline-flex; }

/* theme-aware brand lockup — black mark on light fields, bone mark on dark (.ms-dark) */
.brandmark { display: inline-flex; }
.brandmark img { display: block; width: auto; }
.brandmark .brand-on-dark { display: none; }
.ms-dark .brandmark .brand-on-light { display: none; }
.ms-dark .brandmark .brand-on-dark { display: block; }
.masthead__nav {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
}
.masthead__nav a {
  text-decoration: none;
  color: var(--text-secondary);
  transition: color var(--dur-fast) var(--ease-standard);
}
.masthead__nav a:hover { color: var(--text-primary); }
.masthead__nav a[aria-current="page"] { color: var(--text-primary); }
.masthead__dot { color: var(--ms-bone-300); user-select: none; }

/* ============================================================
   SECTION GRID  — memo rail (tag) + main column (head + body)
   ============================================================ */
.hero {
  padding-block: clamp(72px, 13vh, 168px) clamp(56px, 9vh, 120px);
}

.sec {
  display: grid;
  grid-template-columns: [rail] minmax(170px, 230px) [main] minmax(0, 1fr);
  column-gap: var(--space-8);
  padding-block: clamp(56px, 8vh, 104px);
  border-top: 1px solid var(--rule-hairline);
}
.sec__rail {
  grid-column: rail;
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
}
.sec__index {
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
}
.sec__main { grid-column: main; min-width: 0; }

/* plateau dual-rule device in the rail (toggled by the section-rule tweak) */
.rail-glyph { display: inline-flex; flex-direction: column; align-items: center; gap: 7px; }
.rail-glyph span { height: 3px; background: var(--ms-terracotta); }
.rail-glyph span:first-child { width: 18px; }
.rail-glyph span:last-child { width: 50px; }
[data-secrule="off"] .rail-glyph { display: none; }

/* section tag (mono terracotta) */
.tag {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-accent);
}

/* headline + 1px ink rule directly beneath (signature motif) */
.head {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: clamp(1.7rem, 1.1rem + 1.8vw, var(--text-h2));
  line-height: 1.1;
  letter-spacing: var(--track-display);
  margin: 14px 0 0;
  text-wrap: balance;
  color: var(--text-primary);
}
.title-rule {
  height: 1px;
  background: var(--rule-strong);
  border: 0;
  margin: var(--space-5) 0 var(--space-5);
}
.body {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: var(--leading-body);
  color: var(--text-primary);
  max-width: 64ch;
  text-wrap: pretty;
}
.body--gray { color: var(--text-secondary); }
.body + .body { margin-top: var(--space-5); }

/* ============================================================
   HERO
   ============================================================ */
.hero__eyebrow {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: clamp(28px, 5vh, 56px);
}
.hero__headline {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: clamp(2.2rem, 0.4rem + 4.9vw, 4.6rem);
  line-height: 1.03;
  letter-spacing: -0.025em;
  margin: 0;
  max-width: none;
  text-wrap: balance;
}
.hero__line { display: block; }
.hero__headline .accent { color: var(--text-accent); }
.accent { color: var(--text-accent); }
.hero__sub {
  margin-top: clamp(32px, 5vh, 56px);
  max-width: 62ch;
}
.hero__sub-1 {
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: clamp(1.18rem, 1rem + 0.5vw, 1.5rem);
  line-height: 1.4;
  color: var(--text-primary);
  margin: 0;
  text-wrap: pretty;
}
.hero__sub-2 {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: var(--leading-body);
  color: var(--text-secondary);
  margin: var(--space-5) 0 0;
  text-wrap: pretty;
}
.hero__cta {
  margin-top: clamp(40px, 6vh, 64px);
  display: flex;
  align-items: center;
  gap: var(--space-7);
  flex-wrap: wrap;
}

/* ---- CTA link : mono, terracotta underrule, trailing arrow ---- */
.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
  padding-bottom: 9px;
  border-bottom: 2px solid var(--ms-terracotta);
  transition: color var(--dur-fast) var(--ease-standard);
  white-space: nowrap;
}
.cta .arrow {
  color: var(--ms-terracotta);
  display: inline-block;
  transition: transform var(--dur-base) var(--ease-standard);
}
.cta:hover { color: var(--ms-terracotta); }
.cta:hover .arrow { transform: translateX(5px); }
.cta:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 4px; }

.textlink {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 3px;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease-standard), border-color var(--dur-fast) var(--ease-standard);
}
.textlink:hover { color: var(--text-primary); border-color: var(--ms-terracotta); }
.textlink .arrow { color: var(--ms-terracotta); }

/* ============================================================
   RECOGNITION TABLE  (§ 03)
   ============================================================ */
.rtable {
  margin-top: var(--space-6);
  border-top: 1px solid var(--rule-strong);
}
.rtable__headrow,
.rtable__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: var(--space-7);
}
.rtable__headrow {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule-strong);
}
.rtable__h {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
}
.rtable__row {
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--rule-hairline);
  align-items: start;
}
.rtable__sym {
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--text-body);
  color: var(--text-primary);
  line-height: 1.4;
  position: relative;
  padding-left: 22px;
}
.rtable__sym::before {
  content: "";
  position: absolute;
  left: 0; top: 0.62em;
  width: 12px; height: 2px;
  background: var(--ms-terracotta);
}
.rtable__cause {
  font-family: var(--font-body);
  font-size: var(--text-body);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ============================================================
   PRACTICE STEPS  (§ 04)
   ============================================================ */
.steps { margin-top: var(--space-6); }
.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  column-gap: var(--space-6);
  align-items: baseline;
  padding: var(--space-5) 0;
  border-top: 1px solid var(--rule-hairline);
}
.step:first-child { border-top: 0; }
.step__n {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: var(--track-mono);
  color: var(--text-accent);
}
.step__label {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-h4);
  letter-spacing: var(--track-display);
  color: var(--text-primary);
}
.step__desc {
  font-family: var(--font-body);
  font-size: var(--text-body);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-top: 6px;
  max-width: 58ch;
}

/* ============================================================
   PLAIN LIST  (what we examine / what we install)
   ============================================================ */
.qlist { list-style: none; margin: var(--space-6) 0 0; padding: 0; max-width: 64ch; }
.qlist li {
  position: relative;
  padding: var(--space-4) 0 var(--space-4) 26px;
  border-top: 1px solid var(--rule-hairline);
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: 1.5;
  color: var(--text-primary);
}
.qlist li::before {
  content: "";
  position: absolute;
  left: 0; top: calc(var(--space-4) + 0.62em);
  width: 13px; height: 2px;
  background: var(--ms-terracotta);
}

/* ============================================================
   CLOSING REFRAIN
   ============================================================ */
.refrain {
  padding-block: clamp(80px, 13vh, 160px);
  border-top: 1px solid var(--rule-hairline);
}
.refrain__glyph {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  margin-bottom: var(--space-6);
}
.refrain__glyph span { height: 3px; background: var(--ms-terracotta); }
.refrain__glyph span:first-child { width: 28px; }
.refrain__glyph span:last-child { width: 78px; }
.refrain__line {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: clamp(2.2rem, 0.4rem + 6.6vw, 7rem);
  line-height: 1.0;
  letter-spacing: -0.03em;
  margin: 0;
  max-width: 24ch;
  text-wrap: balance;
  color: var(--text-primary);
}
.refrain__sub {
  margin-top: var(--space-6);
  max-width: 58ch;
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: var(--leading-body);
  color: var(--text-secondary);
  text-wrap: pretty;
}
.refrain__cta { margin-top: var(--space-7); }

/* ============================================================
   FOOTER  — single dark anchor (near-black field, bone letters)
   ============================================================ */
.footer {
  background: var(--surface-canvas);   /* .ms-dark scope flips this to ink */
  color: var(--text-primary);
  border-top: 1px solid var(--ms-ink);
}
.footer__inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-7);
  padding-block: clamp(56px, 8vh, 88px);
  align-items: start;
}
.footer__tagline {
  margin: var(--space-5) 0 0;
  font-family: var(--font-body);
  font-size: var(--text-body);
  color: var(--text-secondary);
  max-width: 42ch;
  line-height: 1.5;
}
.footer__nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
}
.footer__nav a { color: var(--text-secondary); text-decoration: none; transition: color var(--dur-fast) var(--ease-standard); }
.footer__nav a:hover { color: var(--text-primary); }
.footer__base {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-5);
  flex-wrap: wrap;
  padding-block: 22px;
  border-top: 1px solid var(--ms-ink-600);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* ============================================================
   PRACTICE — principal placeholder + simple prose lead
   ============================================================ */
.lead {
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: clamp(1.18rem, 1rem + 0.5vw, 1.5rem);
  line-height: 1.4;
  color: var(--text-primary);
  max-width: 56ch;
  margin: 0;
  text-wrap: pretty;
}
.principal {
  border-left: 3px solid var(--ms-terracotta);
  padding-left: var(--space-6);
  margin-top: var(--space-2);
}
.ph {
  color: var(--text-secondary);
  border-bottom: 1px dotted var(--ms-warm-gray);
  padding-bottom: 1px;
}
.form-note,
.principal__note {
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
  line-height: var(--leading-meta);
}
.principal__note { margin-top: var(--space-5); display: block; }

/* ============================================================
   CONTACT — form
   ============================================================ */
.form { max-width: 560px; }
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}
.form-grid--single { grid-template-columns: 1fr; }
.ta-field { display: flex; flex-direction: column; gap: 6px; }
.ta-label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
}
.ta {
  font-family: var(--font-body);
  font-size: var(--text-small);
  color: var(--text-primary);
  background: var(--surface-raised);
  border: 1px solid var(--rule-hairline);
  border-radius: var(--radius-control);
  padding: 12px;
  min-height: 120px;
  resize: vertical;
  outline: none;
  transition: border-color var(--dur-fast) var(--ease-standard);
}
.ta:focus { border-color: var(--text-primary); outline: 2px solid var(--focus-ring); outline-offset: 2px; }
.form-actions {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-top: var(--space-6);
  flex-wrap: wrap;
}
.form-note { max-width: 52ch; text-transform: none; letter-spacing: var(--track-mono-tight); }

.ack {
  max-width: 560px;
  border-top: 3px solid var(--ms-terracotta);
  padding-top: var(--space-5);
}
.ack__title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-h3);
  letter-spacing: var(--track-display);
  margin: 0;
}
.ack__body {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: var(--leading-body);
  color: var(--text-secondary);
  margin: var(--space-5) 0 0;
  text-wrap: pretty;
}

@media (max-width: 560px) {
  .form-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   REVEAL (entrance motion — gated by JS, visibility + reduced-motion)
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-slow) var(--ease-standard), transform var(--dur-slow) var(--ease-standard);
}
.reveal.is-in { opacity: 1; transform: none; }
.reveal.instant { transition: none !important; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 860px) {
  .sec { grid-template-columns: 1fr; row-gap: var(--space-5); }
  .sec__rail { flex-direction: row; align-items: center; gap: var(--space-5); }
  .footer__inner { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .wrap { width: 88%; }
  .rtable__headrow, .rtable__row { grid-template-columns: 1fr; row-gap: 8px; }
  .rtable__cause { padding-left: 22px; }
  .step { grid-template-columns: 44px 1fr; column-gap: var(--space-4); }
  .hero__cta { gap: var(--space-5); }
}

/* ============================================================
   HERO — small secondary line (mono, audience qualifier)
   ============================================================ */
.hero__note {
  margin-top: clamp(36px, 5vh, 56px);
  max-width: 60ch;
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono-tight);
  line-height: var(--leading-meta);
  color: var(--text-secondary);
  text-transform: none;
}

/* in-body emphasis (bold ink run inside body prose) */
.body strong, .hero__sub-2 strong { font-weight: var(--weight-bold); color: var(--text-primary); }

/* ============================================================
   RECOGNITION SLIDER  (Home · beneath § 01)
   A deliberate stepper — manual prev/next, no auto-advance, no dots,
   no slide animation. Step text left, canon chart right.
   ============================================================ */
.slider {
  padding-block: clamp(48px, 7vh, 92px);
  border-top: 1px solid var(--rule-hairline);
}
.slider__masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}
.slider__kicker {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-accent);
}
.slider__inner {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  column-gap: var(--space-8);
  align-items: center;
}
.slider__count {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-h4);
  letter-spacing: var(--track-mono);
  color: var(--text-secondary);
}
.slider__count b { color: var(--text-primary); font-weight: 500; }
.slider__head {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: clamp(1.5rem, 1rem + 1.5vw, 2.2rem);
  line-height: 1.12;
  letter-spacing: var(--track-display);
  margin: 18px 0 0;
  max-width: 18ch;
  text-wrap: balance;
}
.slider__body {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: var(--leading-body);
  color: var(--text-secondary);
  margin: var(--space-5) 0 0;
  max-width: 46ch;
  text-wrap: pretty;
}
.slider__nav {
  display: flex;
  gap: 14px;
  margin-top: var(--space-7);
}
.slider__nav--mobile { display: none; }
.slider__arrow {
  appearance: none;
  width: 52px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-control);
  color: var(--text-primary);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-standard),
              color var(--dur-fast) var(--ease-standard),
              border-color var(--dur-fast) var(--ease-standard);
}
.slider__arrow:hover:not(:disabled) { background: var(--surface-sunken); }
.slider__arrow--next { border-color: var(--ms-terracotta); color: var(--ms-terracotta); }
.slider__arrow--next:hover:not(:disabled) { background: var(--ms-terracotta); color: var(--ms-bone); }
.slider__arrow:disabled { opacity: 0.32; cursor: default; }
.slider__arrow:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 3px; }

/* canon chart frame */
.slider__chart {
  border: 1px solid var(--rule-hairline);
  background: var(--surface-raised);
  padding: clamp(14px, 2vw, 26px);
}
.canon { display: block; width: 100%; height: auto; }
.canon__title {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  fill: var(--text-secondary);
}
.canon__axis { stroke: currentColor; stroke-width: 1.5; opacity: 0.85; }
.canon__axislabel {
  font-size: 12px;
  letter-spacing: 0.08em;
  fill: var(--text-secondary);
}
.canon__line {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: square;
  stroke-linejoin: round;
}
.canon__line--dashed { stroke-dasharray: 7 7; }
.canon__band { fill: var(--ms-terracotta); opacity: 0.09; }
.canon__bandedge { stroke: var(--ms-terracotta); stroke-width: 1; opacity: 0.5; stroke-dasharray: 3 4; }
.canon__windowlabel {
  font-size: 11.5px;
  letter-spacing: 0.08em;
  fill: var(--ms-terracotta);
}
.canon__markrule { stroke: var(--ms-terracotta); stroke-width: 1; opacity: 0.4; stroke-dasharray: 3 4; }
.canon__dot { fill: var(--ms-terracotta); }
.canon__diamond { fill: var(--ms-terracotta); }
.canon__note {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  fill: var(--text-primary);
}
.canon__series {
  font-size: 12px;
  letter-spacing: 0.08em;
  fill: var(--text-secondary);
}

/* ============================================================
   STAT BLOCKS  (§ 02 · The environment)
   ============================================================ */
.stats {
  margin-top: var(--space-6);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  column-gap: clamp(28px, 4vw, 56px);
}
.stat {
  display: flex;
  flex-direction: column;
  padding-left: clamp(28px, 4vw, 56px);
  border-left: 1px solid var(--rule-hairline);
}
.stat:first-child { border-left: 0; padding-left: 0; }
.stat__num {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: clamp(2.2rem, 0.9rem + 2.7vw, 3.7rem);
  line-height: 0.94;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  margin: 0;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.stat__num--accent { color: var(--text-accent); }
.stat__desc {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: 1.45;
  color: var(--text-primary);
  margin: var(--space-4) 0 0;
  max-width: 32ch;
  text-wrap: pretty;
}
.stat__source {
  display: block;
  margin-top: auto;
  padding-top: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
}

@media (max-width: 860px) {
  .stats { grid-template-columns: 1fr; row-gap: 0; }
  .stat {
    padding-left: 0;
    border-left: 0;
    padding-block: clamp(28px, 4vh, 44px);
    border-top: 1px solid var(--rule-hairline);
  }
  .stat:first-child { border-top: 0; padding-top: var(--space-5); }
  .stat__num { font-size: clamp(3.4rem, 2rem + 6vw, 6.4rem); }
  .stat__desc { max-width: 52ch; }
  .stat__source { margin-top: var(--space-4); padding-top: 0; }
}

/* ============================================================
   DARK BAND  — the lower half of Home / About close / Contact.
   Continuous ink field with a terracotta spine at the left edge.
   ============================================================ */
.darkband {
  background: var(--surface-canvas);   /* ink under .ms-dark */
  color: var(--text-primary);          /* re-resolve so children inherit bone, not body's ink */
  border-top: 1px solid var(--ms-ink-600);
  border-left: 2px solid var(--ms-terracotta);
}
[data-treatment="dark"] .darkband { border-top: 0; }
/* the first .sec inside a dark band shouldn't draw a hairline against the seam */
.darkband > .sec:first-of-type { border-top: 0; }
.darkband .refrain { border-top: 1px solid var(--rule-hairline); }

/* ============================================================
   LIFECYCLE PROSE  (§ 05 · Where it applies)
   ============================================================ */
.body--lead {
  font-weight: var(--weight-medium);
  color: var(--text-primary);
  font-size: clamp(1.18rem, 1rem + 0.5vw, 1.5rem);
  line-height: 1.4;
}

/* ============================================================
   PRINCIPALS TEASER  (§ 06 · Home) + ABOUT bios
   ============================================================ */
.teaser__lead {
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: clamp(1.18rem, 1rem + 0.5vw, 1.5rem);
  line-height: 1.4;
  color: var(--text-primary);
  max-width: 50ch;
  margin: 0;
  text-wrap: pretty;
}
.teaser__link { margin-top: var(--space-6); }

.bios {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-7) var(--space-8);
  margin-top: var(--space-6);
}
.bio { border-top: 3px solid var(--ms-terracotta); padding-top: var(--space-5); }
.bio__name {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-h4);
  letter-spacing: var(--track-display);
  color: var(--text-primary);
  margin: 0;
}
.bio__role {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-accent);
}
.bio__body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.55;
  color: var(--text-secondary);
  margin: var(--space-4) 0 0;
  text-wrap: pretty;
}
.about-coda {
  margin-top: var(--space-7);
  max-width: 64ch;
}

/* ============================================================
   ABOUT — PRINCIPALS (dark reference layout)
   ============================================================ */
.principals { padding-block: clamp(72px, 12vh, 150px); }
.principals__meta {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
}
.principals__heading {
  margin: clamp(40px, 7vh, 84px) 0 clamp(40px, 7vh, 80px);
  font-family: var(--font-mono);
  font-weight: var(--weight-medium);
  font-size: clamp(1.05rem, 0.85rem + 0.7vw, 1.45rem);
  letter-spacing: 0.005em;
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 7px;
  text-decoration-thickness: 1px;
}
.principals__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: clamp(40px, 7vw, 120px);
  row-gap: var(--space-7);
}
.principal__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: clamp(2rem, 0.8rem + 3.4vw, 4.2rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--text-primary);
}
.principal__body {
  margin: clamp(20px, 3vh, 32px) 0 0;
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: 1.45;
  color: var(--text-primary);
  max-width: 42ch;
  text-wrap: pretty;
}
.principals__rule {
  border: 0;
  border-top: 1px solid var(--ms-terracotta);
  margin: clamp(48px, 8vh, 96px) 0 var(--space-6);
}
.principals__coda {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: 1.5;
  color: var(--text-secondary);
  max-width: 96ch;
  text-wrap: pretty;
}
@media (max-width: 860px) {
  .principals__grid { grid-template-columns: 1fr; row-gap: var(--space-7); }
  .principal__body { max-width: 56ch; }
}

/* ============================================================
   CONTACT — underline fields + sign-off lockup
   ============================================================ */
.cform { max-width: 680px; margin-top: var(--space-6); }
.cform__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6) var(--space-7);
}
.field { display: flex; flex-direction: column; gap: 9px; }
.field--full { grid-column: 1 / -1; }
.field__label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
}
.field__input,
.field__textarea {
  font-family: var(--font-body);
  font-size: var(--text-body);
  color: var(--text-primary);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule-strong);
  padding: 8px 2px;
  outline: none;
  width: 100%;
  transition: border-color var(--dur-fast) var(--ease-standard);
}
.field__textarea { resize: vertical; min-height: 84px; line-height: 1.5; }
.field__input:focus,
.field__textarea:focus { border-bottom-color: var(--ms-terracotta); }
.field__input::placeholder,
.field__textarea::placeholder { color: var(--text-secondary); opacity: 0.55; }

.cform__actions {
  margin-top: var(--space-7);
  display: flex;
  align-items: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.cform__note {
  max-width: 46ch;
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono-tight);
  line-height: var(--leading-meta);
  color: var(--text-secondary);
  text-transform: none;
}

.signoff {
  margin-top: clamp(72px, 12vh, 140px);
  padding-top: var(--space-6);
  border-top: 2px solid var(--ms-terracotta);
  border-bottom: 2px solid var(--ms-terracotta);
  padding-bottom: var(--space-6);
}
.signoff__lockup { display: inline-flex; text-decoration: none; }
.signoff__lockup img { height: 54px; width: auto; max-width: 100%; }
@media (max-width: 620px) {
  .signoff__lockup img { height: 32px; }
}
.signoff__base {
  margin-top: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* ============================================================
   RESPONSIVE — v2.3 additions
   ============================================================ */
@media (max-width: 860px) {
  .slider__inner { grid-template-columns: 1fr; row-gap: var(--space-6); }
  .slider__chart { order: 2; }
  .bios { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .cform__grid { grid-template-columns: 1fr; }
  .slider__masthead { flex-direction: column; align-items: flex-start; gap: 6px; }
}

/* ============================================================
   MOBILE — masthead menu trigger
   ============================================================ */
.masthead__menu-btn {
  display: none;
  appearance: none;
  background: transparent;
  border: 0;
  padding: 4px 2px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-primary);
  cursor: pointer;
}
.masthead__menu-btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}

/* ============================================================
   MOBILE — full-screen nav drawer
   ============================================================ */
.mmenu {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: var(--surface-canvas);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  animation: mmenu-in 220ms var(--ease-standard);
}
@keyframes mmenu-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
.mmenu__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 20px;
  border-bottom: 1px solid var(--rule-strong);
}
.mmenu__close {
  appearance: none;
  background: transparent;
  border: 0;
  padding: 4px 2px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--text-meta);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-primary);
  cursor: pointer;
}
.mmenu__close:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}
.mmenu__nav {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  padding-block: clamp(32px, 8vh, 64px);
  gap: 0;
}
.mmenu__link {
  display: block;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: clamp(2.2rem, 1.4rem + 4vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  padding-block: clamp(18px, 3vh, 26px);
  border-top: 1px solid var(--rule-hairline);
}
.mmenu__link:last-child { border-bottom: 1px solid var(--rule-hairline); }
.mmenu__link--current { color: var(--text-accent); }
.mmenu__link:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}
.mmenu__foot {
  padding-block: var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-micro);
  letter-spacing: var(--track-mono);
  text-transform: uppercase;
  color: var(--text-secondary);
  border-top: 1px solid var(--rule-hairline);
}

/* ============================================================
   MOBILE — section + hero stacking refinements (≤ 620px)
   ============================================================ */
@media (max-width: 620px) {
  /* swap masthead nav for the MENU trigger */
  .masthead__nav { display: none; }
  .masthead__menu-btn { display: inline-flex; }

  /* hero: thin terracotta rail along the left, content nudged in */
  .hero {
    border-left: 1px solid var(--ms-terracotta);
    padding-left: var(--space-5);
    padding-block: clamp(48px, 9vh, 96px) clamp(40px, 7vh, 80px);
  }
  .hero__headline {
    font-size: clamp(2rem, 0.6rem + 7vw, 2.8rem);
  }

  /* sections: single column, stacked rail with tag only */
  .sec {
    grid-template-columns: 1fr;
    row-gap: var(--space-4);
  }
  .sec__rail, .sec__main { grid-column: 1 / -1; }
  .sec__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
  .rail-glyph { display: none; }
  .sec__index { display: none; }

  /* slider: text first, chart second, arrows directly under chart */
  .slider { padding-block: clamp(32px, 6vh, 56px); }
  .slider__inner { row-gap: var(--space-5); }
  .slider__chart { order: 3; }
  .slider__nav--desktop { display: none; }
  .slider__nav--mobile {
    display: flex;
    order: 2;
    margin-top: var(--space-4);
  }
  .slider__head { max-width: none; }
  .slider__body { max-width: none; }

  /* stats: slightly more breathing room between blocks */
  .stat { padding-block: clamp(36px, 6vh, 56px); }

  /* principals: single column at true mobile too */
  .principals__grid { grid-template-columns: 1fr; row-gap: var(--space-7); }
  .principal__body { max-width: 56ch; }
}