/* ============================================================
   ATHENA — company site
   Design System v1.0 (paper · ink · brass). Newsreader for what a
   person reads, IBM Plex Mono for what a machine assigns.
   One theme (paper). Restrained motion: it settles like a page turning.
   Tokens live in tokens.css — never invent values outside it.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: var(--a-font-body);
  font-weight: 400;
  font-size: clamp(1.02rem, 0.98rem + 0.25vw, 1.18rem);
  line-height: 1.62;
  color: var(--a-ink);
  background:
    radial-gradient(115% 80% at 50% -8%, var(--a-ivory) 0%, var(--a-ground) 62%) fixed,
    var(--a-ground);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1;
}

::selection { background: var(--a-gold-pale); color: var(--a-ink); }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
strong { font-weight: 600; }
em { font-style: italic; }

/* ---- Layout primitives ---- */
.wrap { width: 100%; max-width: 1240px; margin-inline: auto; padding-inline: clamp(1.25rem, 5vw, 3rem); }
.section { padding-block: clamp(4.5rem, 9vw, 8.5rem); }
.section--tight { padding-block: clamp(3rem, 6vw, 5.5rem); }
.rule { height: 1px; border: 0; background: var(--a-marble-vein); }
.rule--brass { background: linear-gradient(90deg, transparent, var(--a-gold-bright) 18%, var(--a-gold-bright) 82%, transparent); opacity: .7; }

/* Left-rail section: heading column + content column, so wide viewports are
   used on both sides instead of the text clinging to the left. */
.rail { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(2rem, 6vw, 5.5rem); align-items: start; }
.rail__head .mark { margin-bottom: 1.1rem; }
.rail__head .head { max-width: 14ch; }
.rail__body .prose, .rail__body .lede { max-width: 60ch; }
@media (max-width: 900px) { .rail { grid-template-columns: 1fr; gap: clamp(1.4rem, 4vw, 2.2rem); } .rail__head .head { max-width: 22ch; } }

/* section mark: brass roman-numeral inscription. Used sparingly (eyebrow budget). */
.mark {
  font-family: var(--a-font-inscription);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: var(--a-track-wide);
  text-transform: uppercase;
  color: var(--a-bronze);
  display: inline-flex;
  align-items: baseline;
  gap: .6rem;
  margin-bottom: 1.4rem;
}
.mark::before {
  content: attr(data-num);
  color: var(--a-gold);
  font-variant-numeric: tabular-nums;
}

/* ---- Typography scale ---- */
.display {
  font-family: var(--a-font-display);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.011em;
  font-size: clamp(2.6rem, 1.7rem + 4.4vw, 5rem);
}
h2.head {
  font-family: var(--a-font-display);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.008em;
  font-size: clamp(2rem, 1.4rem + 2.6vw, 3.3rem);
  max-width: 18ch;
}
h3.sub {
  font-family: var(--a-font-display);
  font-weight: 500;
  font-size: clamp(1.3rem, 1.1rem + 0.8vw, 1.7rem);
  line-height: 1.18;
  letter-spacing: -0.005em;
}
.lede {
  font-size: clamp(1.18rem, 1.05rem + 0.7vw, 1.5rem);
  line-height: 1.5;
  color: var(--a-ink-soft);
  max-width: 36ch;
  font-weight: 400;
}
.prose { color: var(--a-ink-soft); max-width: var(--a-measure); }
.prose + .prose { margin-top: 1.1rem; }
.muted { color: var(--a-ink-faint); }
.measure { max-width: var(--a-measure); }

/* a pull-quote / aphorism */
.aphorism {
  font-family: var(--a-font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.5rem, 1.2rem + 1.5vw, 2.3rem);
  line-height: 1.28;
  letter-spacing: -0.005em;
  color: var(--a-ink);
  max-width: 24ch;
}
.aphorism cite {
  display: block;
  margin-top: 1.1rem;
  font-family: var(--a-font-inscription);
  font-style: normal;
  font-size: .72rem;
  letter-spacing: var(--a-track-mid);
  text-transform: uppercase;
  color: var(--a-ink-faint);
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--a-ground) 86%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid color-mix(in srgb, var(--a-marble-vein) 70%, transparent);
}
.nav__in {
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.brand { display: inline-flex; align-items: center; color: var(--a-ink); }
.brand-logo { height: 26px; width: auto; display: block; }
.brand-logo--foot { height: 22px; }
.nav__links { display: flex; align-items: center; gap: 2rem; }
.nav__links a {
  font-family: var(--a-font-inscription);
  font-size: .76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--a-ink-soft);
  transition: color .2s var(--a-ease);
}
.nav__links a:hover { color: var(--a-ink); }
.nav__links .nav__cta { margin-left: .4rem; }
@media (max-width: 860px) {
  .nav__links a:not(.nav__cta) { display: none; }
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  font-family: var(--a-font-inscription);
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: .82rem 1.5rem;
  border-radius: var(--a-radius);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .18s var(--a-ease), background .2s var(--a-ease), color .2s var(--a-ease), border-color .2s var(--a-ease), box-shadow .2s var(--a-ease);
}
.btn--primary {
  background: var(--a-ink);
  color: var(--a-ivory);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--a-ink) 30%, transparent);
}
.btn--primary:hover { background: #2a241b; transform: translateY(-1px); box-shadow: 0 10px 24px -12px rgba(28,24,19,.6); }
.btn--primary:active { transform: translateY(0); }
.btn--ghost {
  background: transparent;
  color: var(--a-ink);
  border-color: var(--a-ink);
}
.btn--ghost:hover { background: var(--a-ink); color: var(--a-ivory); transform: translateY(-1px); }
.btn--sm { padding: .58rem 1.05rem; font-size: .72rem; }

/* ============================================================
   HERO
   ============================================================ */
.hero { padding-top: clamp(3rem, 6vw, 5.5rem); padding-bottom: clamp(3.5rem, 7vw, 6rem); }
.hero__grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(2rem, 4vw, 3.8rem);
  align-items: center;
}
/* let grid children shrink below their content min-content (prevents the card
   from stretching the column past a narrow viewport) */
.hero__grid > * { min-width: 0; }
.hero__eyebrow {
  font-family: var(--a-font-inscription);
  font-size: .74rem;
  letter-spacing: var(--a-track-wide);
  text-transform: uppercase;
  color: var(--a-bronze);
  margin-bottom: 1.6rem;
}
.hero__title { margin-bottom: 1.5rem; font-size: clamp(2.3rem, 1.5rem + 2.7vw, 3.5rem); line-height: 1.06; }
.hero__title em { font-style: italic; }
/* let the headline wrap naturally on small screens instead of forcing the long first line */
@media (max-width: 600px) { .hero__title br { display: none; } }
.hero__lede { margin-bottom: 2.1rem; max-width: 42ch; }
.hero__cta { display: flex; flex-wrap: wrap; gap: .9rem; align-items: center; }
/* Hero "Ask Athena" demo card: a real answer, its source, confirmed by the owner */
.ask {
  border: 1px solid var(--a-marble-vein);
  border-radius: var(--a-radius);
  padding: clamp(1.4rem, 2.6vw, 2rem);
  background: linear-gradient(180deg, var(--a-ivory), color-mix(in srgb, var(--a-ivory-deep) 50%, var(--a-ivory)));
  box-shadow: 0 34px 64px -44px rgba(110,83,32,.5);
}
/* two turns: the agent's pending action, then Athena stepping in to advise it */
.ask__turn + .ask__turn { margin-top: 1.15rem; }
.ask__turn--agent { padding-bottom: 1.15rem; border-bottom: 1px solid var(--a-marble-vein); }
.ask__turn--athena { border-left: 2px solid var(--a-gold); padding-left: 1.05rem; }
.ask__who { display: block; font-family: var(--a-font-inscription); font-size: .66rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--a-ink-faint); margin-bottom: .55rem; }
.ask__turn--athena .ask__who { color: var(--a-bronze); }
.ask__act { font-family: var(--a-font-display); font-style: italic; font-weight: 500; font-size: 1.08rem; line-height: 1.3; color: var(--a-ink-soft); }
.ask__a {
  font-family: var(--a-font-body); font-size: 1.04rem; line-height: 1.5;
  color: var(--a-ink); min-height: 4.5em;   /* reserve space so the type-in does not shift layout */
}
.ask__caret {
  display: none; width: 2px; height: 1.05em; background: var(--a-gold);
  margin-left: 2px; vertical-align: -2px;
}
.ask.is-typing .ask__caret { display: inline-block; animation: ask-blink 1s steps(1) infinite; }
@keyframes ask-blink { 50% { opacity: 0; } }
.ask__meta {
  margin-top: 1.15rem; display: grid; gap: .55rem;
  transition: opacity .55s var(--a-ease), transform .55s var(--a-ease);
}
.ask.is-typing .ask__meta { opacity: 0; transform: translateY(6px); }
.ask__src {
  font-family: var(--a-font-inscription); font-size: .71rem; letter-spacing: .03em;
  color: var(--a-bronze); line-height: 1.45;
}
.ask__verified {
  font-family: var(--a-font-inscription); font-size: .71rem; letter-spacing: .06em;
  text-transform: uppercase; color: var(--a-verdigris-deep);
  display: inline-flex; align-items: center; gap: .45rem;
}
.ask__verified::before {   /* verdigris dot = a real "confirmed" state (the brand's verdigris rule) */
  content: ""; width: .5rem; height: .5rem; border-radius: 50%;
  background: var(--a-verdigris); flex: none;
}
@media (prefers-reduced-motion: reduce) {
  .ask__caret { display: none !important; }
  .ask__meta { opacity: 1 !important; transform: none !important; }
}
@media (max-width: 880px) {
  .hero__grid { grid-template-columns: 1fr; gap: 2.5rem; }
}

/* ============================================================
   SECTION: COST OF FORGETTING (ledger of four)
   ============================================================ */
.band { background: var(--a-ivory-deep); border-block: 1px solid var(--a-marble-vein); }
.band--paper { background: color-mix(in srgb, var(--a-ivory) 70%, var(--a-ground)); }

.ledger { display: grid; grid-template-columns: 1fr; border-top: 1px solid var(--a-marble-vein); }
.ledger__row {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.55fr);
  gap: clamp(1rem, 3vw, 2rem);
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--a-marble-vein);
  align-items: baseline;
}
.ledger__when { font-family: var(--a-font-display); font-size: 1.12rem; font-weight: 500; line-height: 1.25; }
.ledger__cost { color: var(--a-ink-soft); font-size: .98rem; line-height: 1.5; }
@media (max-width: 640px) {
  .ledger__row { grid-template-columns: 1fr; gap: .35rem; }
}

/* ============================================================
   SECTION: WHY NOW (numbered forces)
   ============================================================ */
.forces { display: grid; gap: 0; margin-top: clamp(2rem, 4vw, 3rem); }
.force {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(1.2rem, 4vw, 3rem);
  padding: 2rem 0;
  border-top: 1px solid var(--a-marble-vein);
}
.force:last-child { border-bottom: 1px solid var(--a-marble-vein); }
.force__num {
  font-family: var(--a-font-inscription);
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--a-gold);
  padding-top: .35rem;
}
.force h3 { margin-bottom: .6rem; }
.force p { color: var(--a-ink-soft); max-width: 60ch; }

/* a wide declarative callout */
.proclaim {
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  padding: clamp(1.6rem, 3.5vw, 2.4rem) clamp(1.6rem, 4vw, 3rem);
  border-left: 3px solid var(--a-gold);
  background: var(--a-ivory);
  border-radius: var(--a-radius);
  box-shadow: 0 24px 50px -42px rgba(110,83,32,.5);
}
.proclaim p { font-family: var(--a-font-display); font-size: clamp(1.25rem, 1.05rem + 1vw, 1.7rem); line-height: 1.3; max-width: 40ch; }

/* ============================================================
   SECTION: WITH / WITHOUT
   ============================================================ */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1rem, 2.5vw, 1.8rem); margin-top: clamp(2rem, 4vw, 3rem); }
.panel { border-radius: var(--a-radius); padding: clamp(1.6rem, 3.5vw, 2.6rem); border: 1px solid var(--a-marble-vein); }
.panel__tag {
  font-family: var(--a-font-inscription);
  font-size: .72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 1.1rem;
}
.panel p { line-height: 1.55; }
.panel--without { background: var(--a-ivory); }
.panel--without .panel__tag { color: var(--a-ink-faint); }
.panel--without p { color: var(--a-ink-soft); }
.panel--with { background: var(--a-ink); border-color: var(--a-ink); }
.panel--with .panel__tag { color: var(--a-gold-bright); }
.panel--with p { color: var(--a-ivory); opacity: .94; }
.panel--with strong { color: #fff; }
@media (max-width: 720px) { .compare { grid-template-columns: 1fr; } }

/* ============================================================
   SECTION: HOW IT WORKS (the loop)
   ============================================================ */
.loop { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(.8rem, 2vw, 1.4rem); margin-top: clamp(2.2rem, 4vw, 3rem); counter-reset: step; }
.step { position: relative; padding-top: 1.6rem; border-top: 2px solid var(--a-ink); }
.step__k {
  font-family: var(--a-font-inscription);
  font-size: .7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--a-gold);
  margin-bottom: .7rem;
}
.step h3 { font-size: 1.32rem; margin-bottom: .55rem; }
.step p { font-size: .94rem; color: var(--a-ink-soft); line-height: 1.5; }
@media (max-width: 820px) { .loop { grid-template-columns: 1fr 1fr; gap: 1.6rem 1.4rem; } }
@media (max-width: 480px) { .loop { grid-template-columns: 1fr; } }

.trust-note {
  margin-top: clamp(2.2rem, 4vw, 3rem);
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.3rem 1.5rem;
  border: 1px solid color-mix(in srgb, var(--a-verdigris) 40%, var(--a-marble-vein));
  border-radius: var(--a-radius);
  background: color-mix(in srgb, var(--a-verdigris) 7%, var(--a-ivory));
}
.trust-note .dot { width: .7rem; height: .7rem; border-radius: 50%; background: var(--a-verdigris); margin-top: .5rem; flex: none; }
.trust-note p { color: var(--a-verdigris-deep); font-size: .98rem; }
.trust-note strong { color: var(--a-verdigris-deep); }

/* ============================================================
   SECTION: WHY WE WIN (moat list) + flywheel
   ============================================================ */
.moat { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1.6rem, 4vw, 3rem) clamp(2rem, 5vw, 4rem); margin-top: clamp(2rem, 4vw, 3rem); }
.moat__item { border-top: 1px solid var(--a-marble-vein); padding-top: 1.3rem; }
.moat__item h3 { font-size: 1.28rem; margin-bottom: .55rem; }
.moat__item p { color: var(--a-ink-soft); font-size: .98rem; line-height: 1.55; }
@media (max-width: 720px) { .moat { grid-template-columns: 1fr; } }

.flywheel {
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  padding: clamp(1.6rem, 4vw, 2.6rem);
  background: var(--a-ink);
  border-radius: var(--a-radius);
  color: var(--a-ivory);
}
.flywheel .panel__tag { color: var(--a-gold-bright); }
.flywheel p { color: var(--a-ivory); opacity: .95; max-width: 70ch; line-height: 1.55; }
.flywheel b { color: #fff; }

/* ============================================================
   SECTION: BEACHHEAD (ascending ladder)
   ============================================================ */
.ladder { margin-top: clamp(2rem, 4vw, 3rem); display: grid; gap: 0; }
.rung {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(1rem, 3vw, 2.2rem);
  align-items: baseline;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--a-marble-vein);
}
.rung:first-child { border-top: 1px solid var(--a-marble-vein); }
.rung__n { font-family: var(--a-font-inscription); font-size: .82rem; font-weight: 600; color: var(--a-gold); letter-spacing: .08em; }
.rung__t { font-family: var(--a-font-display); font-size: clamp(1.2rem, 1rem + 1vw, 1.7rem); font-weight: 500; line-height: 1.2; }
.rung__t small { display: block; font-family: var(--a-font-body); font-size: .92rem; font-weight: 400; color: var(--a-ink-soft); margin-top: .35rem; padding-left: 0; }
@media (max-width: 640px) { .rung [class$="__t"] { padding-left: 0 !important; } }

/* ============================================================
   SECTION: HOW BIG (ascent)
   ============================================================ */
.ascent { margin-top: clamp(2rem, 4vw, 3rem); border-top: 1px solid var(--a-marble-vein); }
.level {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: clamp(1rem, 4vw, 3rem);
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--a-marble-vein);
  align-items: baseline;
}
.level__k { font-family: var(--a-font-inscription); font-size: .74rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--a-bronze); }
.level:last-child .level__k { color: var(--a-gold); }
.level__v { font-family: var(--a-font-display); font-size: clamp(1.15rem, 1rem + .8vw, 1.55rem); line-height: 1.25; }
.level:last-child .level__v { font-style: italic; }
@media (max-width: 640px) { .level { grid-template-columns: 1fr; gap: .3rem; } }

/* ============================================================
   SECTION: TEAM
   ============================================================ */
.team { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.2rem, 3vw, 2rem); margin-top: clamp(2rem, 4vw, 3rem); }
.member { border-top: 2px solid var(--a-ink); padding-top: 1.3rem; }
.member__name { font-family: var(--a-font-display); font-size: 1.45rem; font-weight: 500; }
.member__role { font-family: var(--a-font-inscription); font-size: .68rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--a-bronze); margin: .45rem 0 .9rem; }
.member p { font-size: .95rem; color: var(--a-ink-soft); line-height: 1.5; }
@media (max-width: 760px) { .team { grid-template-columns: 1fr; gap: 1.8rem; } }

/* ============================================================
   SECTION: REQUEST ACCESS (CTA + form)
   ============================================================ */
.cta { background: var(--a-ink); color: var(--a-ivory); }
.cta__grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: center; }
.cta__title { font-family: var(--a-font-display); font-weight: 400; line-height: 1.08; font-size: clamp(1.9rem, 1.4rem + 2.4vw, 3rem); color: var(--a-ivory); letter-spacing: -.008em; }
.cta__title em { font-style: italic; color: var(--a-gold-bright); }
.cta__lede { margin-top: 1.2rem; color: var(--a-ivory); opacity: .85; max-width: 42ch; }
.form { display: grid; gap: .55rem; }
.form label { font-family: var(--a-font-inscription); font-size: .7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--a-gold-bright); }
.form__row { display: flex; gap: .7rem; }
.form input[type="email"] {
  flex: 1;
  min-width: 0;
  font-family: var(--a-font-body);
  font-size: 1.05rem;
  padding: .85rem 1rem;
  color: var(--a-ivory);
  background: color-mix(in srgb, #fff 6%, transparent);
  border: 1px solid color-mix(in srgb, var(--a-gold-bright) 45%, transparent);
  border-radius: var(--a-radius);
  transition: border-color .2s var(--a-ease), box-shadow .2s var(--a-ease);
}
.form input::placeholder { color: color-mix(in srgb, var(--a-ivory) 55%, transparent); }
.form input:focus { outline: none; border-color: var(--a-gold-bright); box-shadow: 0 0 0 3px color-mix(in srgb, var(--a-gold-bright) 25%, transparent); }
.form .btn--primary { background: var(--a-ivory); color: var(--a-ink); }
.form .btn--primary:hover { background: #fff; }
.form__hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form__note { font-family: var(--a-font-inscription); font-size: .68rem; letter-spacing: 0.06em; color: color-mix(in srgb, var(--a-ivory) 60%, transparent); margin-top: .2rem; }
.form__msg { min-height: 1.2em; font-size: .92rem; }
.form__msg.is-ok { color: var(--a-gold-bright); }
.form__msg.is-err { color: #E7A977; }
@media (max-width: 760px) {
  .cta__grid { grid-template-columns: 1fr; gap: 2rem; }
  .form__row { flex-direction: column; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.foot { border-top: 1px solid var(--a-marble-vein); }
.foot__in { display: flex; flex-wrap: wrap; gap: 1.5rem 2.5rem; justify-content: space-between; align-items: center; padding-block: 2.5rem; }
.foot .brand b { color: var(--a-ink); }
.foot__links { display: flex; flex-wrap: wrap; gap: 1.5rem; }
.foot__links a { font-family: var(--a-font-inscription); font-size: .72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--a-ink-faint); transition: color .2s var(--a-ease); }
.foot__links a:hover { color: var(--a-ink); }
.foot__legal { width: 100%; padding-bottom: 2.5rem; }
.foot__legal p { font-family: var(--a-font-inscription); font-size: .66rem; letter-spacing: 0.04em; color: var(--a-ink-faint); }

/* ============================================================
   SCROLL REVEAL (dial 3 — quiet)
   ============================================================ */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity var(--a-reveal-dur) var(--a-ease), transform var(--a-reveal-dur) var(--a-ease); will-change: opacity, transform; }
.reveal.is-in { opacity: 1; transform: none; }
.reveal[data-d="1"] { transition-delay: .08s; }
.reveal[data-d="2"] { transition-delay: .16s; }
.reveal[data-d="3"] { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  .btn, .nav__links a, .foot__links a { transition: none !important; }
}

/* skip link for a11y */
.skip { position: absolute; left: -9999px; top: 0; background: var(--a-ink); color: var(--a-ivory); padding: .6rem 1rem; z-index: 100; }
.skip:focus { left: .5rem; top: .5rem; }

/* a mark without an assigned numeral drops the inscription slot (the right-rail
   index owns the roman numbering now). */
.mark:not([data-num])::before { content: none; }

/* ============================================================
   SECTION INDEX (.dex): roman-numeral scroll-spy on the right.
   Visible at every width and lights the chapter you are reading.
   - Wide desktop: numerals tuck into the gutter beside the 1240px
     column; the chapter name flashes on hover.
   - Laptop / tablet / phone: collapses to a compact dot rail
     hugging the right margin (see the max-width: 900px block).
   ============================================================ */
.dex {
  position: fixed;
  top: 50%;
  right: max(1.5rem, calc((100vw - 1240px) / 2 - 2.1rem));
  transform: translateY(-50%);
  z-index: 40;
  display: block;
}
.dex__list {
  position: relative;
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: .1rem; align-items: flex-end;
}
/* the track: a faint vertical line the dots ride down as you scroll */
.dex__list::before {
  content: ""; position: absolute; top: .55rem; bottom: .55rem;
  left: calc(100% + .55rem + 2px); width: 1px;
  background: var(--a-marble-vein); opacity: .7;
}
.dex__link {
  --dex-ink: var(--a-ink-faint);
  display: inline-flex; align-items: center; justify-content: flex-end;
  gap: .7rem; padding: .34rem 0; text-decoration: none; line-height: 1;
}
.dex__label {
  font-family: var(--a-font-inscription);
  font-size: .6rem; letter-spacing: var(--a-track-mid); text-transform: uppercase;
  white-space: nowrap; color: var(--dex-ink);
  background: var(--a-ground); padding: .2rem .46rem; border-radius: var(--a-radius);
  opacity: 0; transform: translateX(.4rem);
  transition: opacity .4s var(--a-ease), transform .4s var(--a-ease), color .4s var(--a-ease);
}
.dex__num {
  position: relative;
  font-family: var(--a-font-inscription);
  font-size: .66rem; font-weight: 500; letter-spacing: .04em;
  font-variant-numeric: tabular-nums; color: var(--dex-ink);
  min-width: 2.6ch; text-align: right;
  transition: color .4s var(--a-ease);
}
/* dot on the track, right of the numeral. Fixed size so it never touches the glyph. */
.dex__num::after {
  content: ""; position: absolute; top: 50%; left: calc(100% + .55rem);
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--a-ground); border: 1px solid var(--a-marble-vein);
  transform: translateY(-50%);
  transition: background-color .35s var(--a-ease), border-color .35s var(--a-ease), transform .35s var(--a-ease);
}
.dex__link:hover { --dex-ink: var(--a-bronze); }
.dex__link:hover .dex__num::after { border-color: var(--a-bronze); }
.dex__link.is-here { --dex-ink: var(--a-gold); }
.dex__link.is-here .dex__num::after { background: var(--a-gold-bright); border-color: var(--a-gold); transform: translateY(-50%) scale(1.3); }
.dex__link:focus-visible { outline: 2px solid var(--a-gold); outline-offset: 3px; border-radius: var(--a-radius); }

/* Wide desktop only: the gutter is deep enough to flash the chapter name on
   hover. It is pointer-driven and transient, so it never sits over the text
   on its own (the persistent active-chip used to overlap the hero card). */
@media (min-width: 1280px) and (hover: hover) {
  .dex__link:hover .dex__label { opacity: 1; transform: none; }
}

/* Below the gutter (laptop down to phone) there is no room beside the text
   column, so the index collapses to a compact dot rail hugging the right
   margin. Numerals would crowd full-width copy, so they drop to dots that
   ride the track; the chapter you are reading lights gold. The names stay in
   the DOM for screen readers. Bigger, evenly spaced hit areas for touch. */
@media (max-width: 900px) {
  .dex { right: clamp(.3rem, 1.6vw, .9rem); }
  .dex__label {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0 0 0 0); white-space: nowrap; border: 0;
    opacity: 1; transform: none; background: none;
  }
  .dex__link { gap: 0; padding: 0; }
  .dex__num {
    font-size: 0; min-width: 0;
    width: 1.35rem; height: 1.7rem;
    display: grid; place-items: center;
  }
  .dex__num::after {
    position: static; left: auto; top: auto; transform: none;
    width: 6px; height: 6px;
  }
  .dex__link.is-here .dex__num::after { transform: scale(1.4); }
  .dex__list { gap: .1rem; }
  .dex__list::before { left: 50%; transform: translateX(-50%); top: .85rem; bottom: .85rem; }
}

@media (prefers-reduced-motion: reduce) {
  .dex__label, .dex__num, .dex__num::after { transition: none; }
}