/* Hazvex field ledger — below-fold editorial system */

:root {
  /* Color */
  --color-bg: #f2ede3;
  --color-surface: #faf7f0;
  --color-text: #171816;
  --color-muted: #65665f;
  --color-accent: #e9572b;
  --color-focus: #1f6752;
  --color-success: #2d7156;
  --color-warning: #a65a18;
  --color-danger: #a4382f;
  --color-line: rgba(23, 24, 22, .2);
  --color-line-soft: rgba(23, 24, 22, .1);
  --color-paper-ink: #f7f1e7;

  /* Typography */
  --font-display: "Instrument Serif", Georgia, serif;
  --font-body: "IBM Plex Sans", "Avenir Next", sans-serif;
  --font-mono: "IBM Plex Mono", "Courier Prime", monospace;
  --text-xs: .72rem;
  --leading-xs: 1.35;
  --text-sm: .86rem;
  --leading-sm: 1.5;
  --text-base: 1rem;
  --leading-base: 1.65;
  --text-lg: clamp(1.1rem, 1.4vw, 1.28rem);
  --leading-lg: 1.5;
  --text-xl: clamp(2.2rem, 4vw, 4.5rem);
  --leading-xl: .96;
  --text-2xl: clamp(4.25rem, 8.4vw, 9.25rem);
  --leading-2xl: .82;

  /* Spacing */
  --space-1: .5rem;
  --space-2: .75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-6: 2.5rem;
  --space-8: clamp(4rem, 8vw, 8rem);

  /* Radius and shadow */
  --radius-sm: .15rem;
  --radius-md: .35rem;
  --radius-lg: .7rem;
  --shadow-sm: 0 1px 0 rgba(23, 24, 22, .12);
  --shadow-md: 0 18px 50px rgba(23, 24, 22, .08);
  --shadow-lg: 0 35px 90px rgba(23, 24, 22, .14);

  /* Motion */
  --duration-fast: 160ms;
  --duration-base: 360ms;
  --duration-slow: 760ms;
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --ease-spring: cubic-bezier(.16, 1.25, .3, 1);

  /* Existing hero aliases */
  --paper: var(--color-bg);
  --ink: var(--color-text);
  --muted: var(--color-muted);
  --line: var(--color-line);
  --accent: var(--color-accent);
  --moss: var(--color-focus);
  --font-ui: var(--font-body);
}

.below {
  position: relative;
  z-index: 30;
  display: flow-root;
  overflow: clip;
  isolation: isolate;
  color: var(--color-text);
  background:
    linear-gradient(90deg, transparent calc(100% - 1px), var(--color-line-soft) 1px) 0 0 / 25% 100%,
    var(--color-bg);
  font-family: var(--font-body);
}

.below::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  opacity: .22;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.18'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
  pointer-events: none;
}

.below__chapters {
  min-width: 0;
}

.chapter {
  position: relative;
  scroll-margin-top: 4rem;
  border-bottom: 1px solid var(--color-line);
}

.chapter__inner {
  width: min(100% - clamp(2.5rem, 8vw, 9rem), 1340px);
  margin-inline: auto;
  padding-block: clamp(7rem, 12vw, 12rem);
}

.chapter-head {
  display: grid;
  grid-template-columns: minmax(10rem, .42fr) minmax(0, 1.58fr);
  column-gap: clamp(2rem, 6vw, 7rem);
  align-items: start;
  margin-bottom: clamp(4.5rem, 9vw, 9rem);
}

.chapter-head h2 {
  grid-column: 2;
  max-width: 11ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  line-height: var(--leading-2xl);
  letter-spacing: -.055em;
  text-wrap: balance;
}

.chapter-head h2 em,
.scope-sheet h2 em,
.final h2 em {
  color: var(--color-accent);
  font-weight: inherit;
}

.chapter-kicker {
  display: flex;
  grid-column: 1;
  grid-row: 1;
  align-items: baseline;
  gap: var(--space-2);
  margin: .55rem 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: var(--leading-xs);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.chapter-kicker span {
  color: var(--color-accent);
}

.chapter-lede {
  grid-column: 2;
  max-width: 41rem;
  margin: clamp(1.8rem, 4vw, 3.5rem) 0 0;
  color: var(--color-muted);
  font-size: var(--text-lg);
  font-weight: 300;
  line-height: var(--leading-lg);
  letter-spacing: -.015em;
}

.chapter-head--split {
  grid-template-columns: minmax(9rem, .35fr) minmax(18rem, 1fr) minmax(18rem, .65fr);
}

.chapter-head--split h2 {
  grid-column: 2;
}

.chapter-head--split .chapter-lede {
  grid-column: 3;
  margin-top: .35rem;
  padding-top: .4rem;
  border-top: 1px solid var(--color-line);
}

.reveal {
  opacity: 1;
  transform: none;
}

.reveal-ready .reveal {
  opacity: 0;
  transform: translate3d(0, 2rem, 0);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.reveal-ready .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* Network failure */
.network-status {
  position: fixed;
  z-index: 100;
  right: 1rem;
  bottom: 1rem;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .8rem;
  width: min(30rem, calc(100% - 2rem));
  padding: 1rem;
  border: 1px solid var(--color-danger);
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
  color: var(--color-text);
}

.network-status[hidden] {
  display: none;
}

.network-status > span {
  color: var(--color-danger);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
}

.network-status p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-sm);
}

/* Calculator */
.calc {
  display: grid;
  grid-template-columns: minmax(19rem, .9fr) minmax(28rem, 1.1fr);
  align-items: stretch;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.calc__controls {
  display: grid;
  align-content: center;
  gap: clamp(2.5rem, 4.5vw, 4.5rem);
  padding: clamp(3rem, 6vw, 6rem) clamp(2rem, 5vw, 5rem) clamp(3rem, 6vw, 6rem) 0;
}

.calc__instruction {
  margin: 0;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.calc__label-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  margin-bottom: .8rem;
}

.calc__label-row label {
  font-size: var(--text-sm);
  font-weight: 500;
}

.calc__label-row output {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}

.calc__slider {
  position: relative;
  height: 2px;
  background: var(--color-line);
}

.calc__slider-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background: var(--color-accent);
  pointer-events: none;
}

.calc__slider input {
  position: absolute;
  inset: -21px 0;
  width: 100%;
  height: 44px;
  margin: 0;
  appearance: none;
  background: transparent;
  cursor: ew-resize;
}

.calc__slider input::-webkit-slider-thumb {
  width: 1.15rem;
  height: 1.15rem;
  appearance: none;
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  background: var(--color-bg);
  box-shadow: 0 0 0 5px var(--color-bg);
  transition: transform var(--duration-fast) var(--ease-spring), background var(--duration-fast);
}

.calc__slider input::-moz-range-thumb {
  width: 1.15rem;
  height: 1.15rem;
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  background: var(--color-bg);
  box-shadow: 0 0 0 5px var(--color-bg);
}

.calc__slider input:hover::-webkit-slider-thumb,
.calc__slider input:active::-webkit-slider-thumb {
  transform: scale(1.2);
  background: var(--color-accent);
}

.calc__slider input:disabled {
  cursor: not-allowed;
  opacity: .45;
}

.calc__range {
  display: flex;
  justify-content: space-between;
  margin-top: .75rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: .64rem;
}

.calc__result {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 42rem;
  padding: clamp(3rem, 7vw, 7rem);
  overflow: hidden;
  background: var(--color-text);
  color: var(--color-paper-ink);
}

.calc__result::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .08;
  background: repeating-linear-gradient(0deg, transparent 0 2.8rem, currentColor 2.8rem calc(2.8rem + 1px));
  pointer-events: none;
}

.calc__stamp {
  position: absolute;
  top: 2rem;
  right: 2rem;
  display: grid;
  place-items: center;
  width: 6.5rem;
  aspect-ratio: 1;
  border: 1px solid currentColor;
  border-radius: 50%;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: .62rem;
  line-height: 1.25;
  letter-spacing: .09em;
  text-align: center;
  text-transform: uppercase;
  transform: rotate(7deg);
}

.calc__result-label {
  color: rgba(247, 241, 231, .55);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.calc__result-value {
  display: block;
  margin: .8rem 0 clamp(3rem, 6vw, 6rem);
  font-family: var(--font-display);
  font-size: clamp(5rem, 10vw, 10rem);
  font-weight: 400;
  font-variant-numeric: lining-nums tabular-nums;
  line-height: .82;
  letter-spacing: -.06em;
}

.calc__result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  padding-top: 1.3rem;
  border-top: 1px solid rgba(247, 241, 231, .22);
}

.calc__result-grid span,
.calc__result-grid strong {
  display: block;
}

.calc__result-grid span {
  margin-bottom: .55rem;
  color: rgba(247, 241, 231, .48);
  font-family: var(--font-mono);
  font-size: .67rem;
  line-height: 1.4;
  text-transform: uppercase;
}

.calc__result-grid strong {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.calc__note {
  max-width: 34rem;
  margin: 2rem 0 0;
  color: rgba(247, 241, 231, .48);
  font-size: var(--text-xs);
  line-height: 1.55;
}

.calc__result .cta-row {
  margin-top: 2rem;
}

/* Evidence */
.case-list {
  border-top: 1px solid var(--color-line);
}

.case-study {
  display: grid;
  grid-template-columns: minmax(11rem, .65fr) minmax(20rem, 1.2fr) minmax(19rem, .8fr);
  gap: clamp(2rem, 5vw, 6rem);
  align-items: start;
  padding: clamp(3rem, 6vw, 6rem) 0;
  border-bottom: 1px solid var(--color-line);
}

.case-study__identity {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  align-items: start;
}

.case-study__number {
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--color-accent);
  border-radius: 50%;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.case-study__identity p,
.case-study__story p {
  margin: 0;
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-sm);
}

.case-study__identity strong {
  color: var(--color-text);
  font-weight: 500;
}

.case-study__story h3 {
  max-width: 14ch;
  margin: 0 0 1.2rem;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 4.2vw, 5rem);
  font-weight: 400;
  line-height: .91;
  letter-spacing: -.04em;
}

.case-study__story p {
  max-width: 36rem;
}

.case-study__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 0;
}

.case-study__stats div {
  padding-top: .7rem;
  border-top: 1px solid var(--color-line);
}

.case-study__stats dt {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: .65rem;
  line-height: 1.4;
  text-transform: uppercase;
}

.case-study__stats dd {
  margin: 1.2rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 4vw, 4.5rem);
  line-height: .85;
  letter-spacing: -.045em;
}

.case-study__stats small {
  display: block;
  margin-top: .4rem;
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: 0;
}

.evidence-note {
  display: grid;
  grid-template-columns: minmax(10rem, .35fr) minmax(0, 1fr);
  gap: 2rem;
  max-width: 58rem;
  margin: 3rem 0 0 auto;
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-sm);
}

.evidence-note span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
}

/* Method */
.chapter--method {
  background: color-mix(in srgb, var(--color-focus) 8%, var(--color-bg));
}

.process-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--color-line);
}

.process-list li {
  position: relative;
  display: grid;
  grid-template-columns: minmax(3rem, .25fr) minmax(15rem, .75fr) minmax(19rem, 1fr) minmax(9rem, .5fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: baseline;
  padding: clamp(2.5rem, 5vw, 4.5rem) 0;
  border-bottom: 1px solid var(--color-line);
}

.process-list__n,
.process-list__verb,
.process-list__output {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.process-list__n {
  color: var(--color-accent);
}

.process-list__verb {
  margin: 0 0 .7rem;
  color: var(--color-muted);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.process-list h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.3rem, 4vw, 4.5rem);
  font-weight: 400;
  line-height: .9;
  letter-spacing: -.04em;
}

.process-list li > p {
  max-width: 38rem;
  margin: 0;
  color: var(--color-muted);
  font-size: var(--text-base);
  line-height: var(--leading-base);
}

.process-list__output {
  padding-top: .35rem;
  border-top: 1px solid var(--color-accent);
  color: var(--color-accent);
  line-height: var(--leading-sm);
  text-transform: uppercase;
}

/* Scope */
.chapter--scope .chapter__inner {
  width: min(100% - clamp(1.5rem, 4vw, 4rem), 1500px);
}

.scope-sheet {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(24rem, .85fr);
  min-height: 52rem;
  background: var(--color-text);
  color: var(--color-paper-ink);
  box-shadow: var(--shadow-lg);
}

.scope-sheet__intro,
.scope-sheet__ledger {
  padding: clamp(3rem, 7vw, 8rem);
}

.scope-sheet__intro {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  background:
    radial-gradient(circle at 20% 85%, rgba(233, 87, 43, .2), transparent 35%),
    var(--color-text);
}

.chapter-kicker--light {
  color: var(--color-paper-ink);
}

.scope-sheet h2 {
  margin: auto 0 2.5rem;
  font-family: var(--font-display);
  font-size: clamp(4.6rem, 8vw, 9rem);
  font-weight: 400;
  line-height: .82;
  letter-spacing: -.055em;
}

.scope-sheet__intro > p:not(.chapter-kicker) {
  max-width: 40rem;
  margin: 0;
  color: rgba(247, 241, 231, .6);
  font-size: var(--text-base);
  line-height: var(--leading-base);
}

.scope-sheet__intro .cta-row {
  margin-top: 2.5rem;
}

.scope-sheet__ledger {
  display: flex;
  flex-direction: column;
  border-left: 1px solid rgba(247, 241, 231, .18);
}

.scope-sheet__label,
.scope-sheet__foot {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.scope-sheet__label {
  color: var(--color-accent);
}

.scope-sheet__ledger ol {
  margin: auto 0;
  padding: 0;
  list-style: none;
}

.scope-sheet__ledger li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  padding: 1.3rem 0;
  border-top: 1px solid rgba(247, 241, 231, .17);
}

.scope-sheet__ledger li > span {
  color: rgba(247, 241, 231, .3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.scope-sheet__ledger strong,
.scope-sheet__ledger small {
  grid-column: 2;
}

.scope-sheet__ledger strong {
  font-size: var(--text-base);
  font-weight: 500;
}

.scope-sheet__ledger small {
  margin-top: .35rem;
  color: rgba(247, 241, 231, .45);
  font-size: var(--text-xs);
}

.scope-sheet__foot {
  color: rgba(247, 241, 231, .45);
}

/* FAQ */
.faq {
  max-width: 72rem;
  margin-left: auto;
  border-top: 1px solid var(--color-line);
}

.faq-item {
  border-bottom: 1px solid var(--color-line);
}

.faq-item__trigger {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr) 2rem;
  gap: 1rem;
  align-items: center;
  width: 100%;
  min-height: 4.5rem;
  padding: 1.4rem 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: color var(--duration-fast);
}

.faq-item__trigger:hover {
  color: var(--color-accent);
}

.faq-item__trigger:active {
  transform: translateY(1px);
}

.faq-item__trigger > span:nth-child(2) {
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3vw, 3rem);
  line-height: 1;
  letter-spacing: -.025em;
}

.faq-item__n {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.faq-item__mark {
  position: relative;
  width: 1.5rem;
  height: 1.5rem;
  justify-self: end;
}

.faq-item__mark::before,
.faq-item__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1rem;
  height: 1px;
  background: currentColor;
  transform: translate(-50%, -50%);
  transition: transform var(--duration-base) var(--ease-spring);
}

.faq-item__mark::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item.is-open .faq-item__mark::after {
  transform: translate(-50%, -50%) rotate(0);
}

.faq-item__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--duration-base) var(--ease-out);
}

.faq-item.is-open .faq-item__panel {
  grid-template-rows: 1fr;
}

.faq-item__panel > div {
  overflow: hidden;
}

.faq-item__panel p {
  max-width: 42rem;
  margin: 0 0 0 4rem;
  padding: 0 0 2rem;
  color: var(--color-muted);
  font-size: var(--text-base);
  line-height: var(--leading-base);
}

/* Final chapter */
.chapter--contact {
  overflow: hidden;
  background: var(--color-accent);
}

.chapter--contact::before {
  content: "START";
  position: absolute;
  right: -2vw;
  bottom: -7vw;
  color: rgba(23, 24, 22, .075);
  font-family: var(--font-mono);
  font-size: 26vw;
  line-height: .8;
  letter-spacing: -.1em;
  pointer-events: none;
}

.final {
  position: relative;
  z-index: 1;
}

.final .chapter-kicker span {
  color: var(--color-text);
}

.final h2 {
  max-width: 10ch;
  margin: clamp(3rem, 7vw, 7rem) 0 0;
  font-family: var(--font-display);
  font-size: clamp(5rem, 11vw, 12rem);
  font-weight: 400;
  line-height: .8;
  letter-spacing: -.065em;
}

.final h2 em {
  color: var(--color-paper-ink);
}

.final__lower {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: end;
  margin-top: clamp(4rem, 9vw, 9rem);
  padding-top: 1.5rem;
  border-top: 1px solid rgba(23, 24, 22, .35);
}

.final__lower > p {
  max-width: 34rem;
  margin: 0;
  font-size: var(--text-lg);
  line-height: var(--leading-lg);
}

.final__lower .cta-row {
  justify-content: flex-end;
}

/* Shared controls */
.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
}

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .65rem;
  min-height: 3rem;
  padding: .78rem 1.15rem;
  border: 1px solid currentColor;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  transition:
    transform var(--duration-fast) var(--ease-out),
    color var(--duration-fast),
    background var(--duration-fast),
    box-shadow var(--duration-fast);
}

.btn svg {
  width: 1rem;
  height: 1rem;
  transition: transform var(--duration-fast) var(--ease-out);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn:hover svg {
  transform: translate(.12rem, -.12rem);
}

.btn:active {
  transform: translateY(1px);
  box-shadow: none;
}

.btn--ink {
  border-color: var(--color-text);
  background: var(--color-text);
  color: var(--color-paper-ink);
}

.btn--paper {
  border-color: var(--color-paper-ink);
  background: var(--color-paper-ink);
  color: var(--color-text);
}

.btn--accent {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-text);
}

.btn[aria-disabled="true"],
.btn:disabled {
  opacity: .42;
  pointer-events: none;
  cursor: not-allowed;
}

.btn.is-loading {
  color: transparent;
  pointer-events: none;
}

.btn.is-loading::after {
  content: "";
  position: absolute;
  width: .9rem;
  height: .9rem;
  border: 1px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: control-spin .7s linear infinite;
}

@keyframes control-spin {
  to { transform: rotate(1turn); }
}

.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: .3rem 0;
  border-bottom: 1px solid currentColor;
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color var(--duration-fast), border-color var(--duration-fast);
}

.text-link:hover {
  color: var(--color-accent);
}

.text-link:active {
  opacity: .65;
}

.text-link--paper {
  color: rgba(247, 241, 231, .72);
}

.below :is(a, button, input):focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

.scope-sheet :is(a, button):focus-visible,
.calc__result :is(a, button):focus-visible {
  outline-color: var(--color-accent);
}

/* Footer */
.site-footer {
  clear: both;
  padding: clamp(4rem, 7vw, 7rem) 0 2rem;
  background: var(--color-text);
  color: var(--color-paper-ink);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.5fr .7fr .7fr auto;
  gap: 2rem;
  align-items: start;
  width: min(100% - clamp(2.5rem, 8vw, 9rem), 1340px);
  margin-inline: auto;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.site-footer__brand > span {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-style: italic;
  line-height: 1;
}

.site-footer__brand small,
.site-footer__legal {
  max-width: 24rem;
  color: rgba(247, 241, 231, .45);
  font-size: var(--text-xs);
  line-height: var(--leading-sm);
}

.site-footer__inner > div:not(.site-footer__brand) {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .7rem;
}

.site-footer strong {
  margin-bottom: .3rem;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
}

.site-footer a {
  min-height: 2rem;
  color: rgba(247, 241, 231, .75);
  font-size: var(--text-sm);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-paper-ink);
}

.site-footer__legal {
  justify-self: end;
}

/* Tablet */
@media (max-width: 1100px) {
  .chapter__inner {
    width: min(100% - 3rem, 1340px);
  }

  .chapter-head,
  .chapter-head--split {
    grid-template-columns: 8rem minmax(0, 1fr);
  }

  .chapter-head--split .chapter-lede {
    grid-column: 2;
    margin-top: 2rem;
  }

  .calc {
    grid-template-columns: 1fr;
  }

  .calc__controls {
    padding-right: 0;
  }

  .calc__result {
    min-height: 36rem;
  }

  .case-study {
    grid-template-columns: minmax(10rem, .55fr) minmax(0, 1.2fr);
  }

  .case-study__stats {
    grid-column: 2;
  }

  .process-list li {
    grid-template-columns: 3rem minmax(12rem, .7fr) minmax(0, 1fr);
  }

  .process-list__output {
    grid-column: 2 / -1;
  }

  .scope-sheet {
    grid-template-columns: 1fr;
  }

  .scope-sheet__intro {
    min-height: 44rem;
  }

  .scope-sheet__ledger {
    border-top: 1px solid rgba(247, 241, 231, .18);
    border-left: 0;
  }

  .scope-sheet__ledger ol {
    margin-block: 3rem;
  }
}

/* Mobile narrative */
@media (max-width: 760px) {
  .below {
    display: block;
    background:
      linear-gradient(90deg, transparent calc(100% - 1px), var(--color-line-soft) 1px) 0 0 / 50% 100%,
      var(--color-bg);
  }

  .chapter {
    scroll-margin-top: 6rem;
  }

  .chapter__inner {
    width: min(100% - 2rem, 1340px);
    padding-block: 6rem;
  }

  .chapter-head,
  .chapter-head--split {
    display: block;
    margin-bottom: 4rem;
  }

  .chapter-kicker {
    margin-bottom: 2rem;
  }

  .chapter-head h2 {
    font-size: clamp(4rem, 18vw, 7rem);
  }

  .chapter-lede,
  .chapter-head--split .chapter-lede {
    margin-top: 2rem;
  }

  .calc__controls {
    padding-block: 3rem 4rem;
  }

  .calc__result {
    min-height: 34rem;
    margin-inline: -.15rem;
    padding: 2rem 1.5rem;
  }

  .calc__stamp {
    top: 1.5rem;
    right: 1.5rem;
    width: 5rem;
  }

  .calc__result-value {
    margin-top: 1.2rem;
    font-size: clamp(4.6rem, 20vw, 7rem);
  }

  .case-study {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding-block: 4rem;
  }

  .case-study__stats {
    grid-column: 1;
  }

  .evidence-note {
    grid-template-columns: 1fr;
  }

  .process-list li {
    grid-template-columns: 2.5rem 1fr;
    gap: 1.5rem 1rem;
  }

  .process-list li > p,
  .process-list__output {
    grid-column: 2;
  }

  .chapter--scope .chapter__inner {
    width: calc(100% - 1rem);
  }

  .scope-sheet__intro,
  .scope-sheet__ledger {
    padding: 2.5rem 1.5rem;
  }

  .scope-sheet__intro {
    min-height: 42rem;
  }

  .scope-sheet h2 {
    font-size: clamp(4.5rem, 20vw, 7rem);
  }

  .faq-item__trigger {
    grid-template-columns: 2rem minmax(0, 1fr) 2rem;
  }

  .faq-item__panel p {
    margin-left: 3rem;
  }

  .final h2 {
    font-size: clamp(5rem, 20vw, 8rem);
  }

  .final__lower {
    grid-template-columns: 1fr;
  }

  .final__lower .cta-row {
    justify-content: flex-start;
  }

  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    width: min(100% - 2rem, 1340px);
  }

  .site-footer__brand,
  .site-footer__legal {
    grid-column: 1 / -1;
  }

  .site-footer__legal {
    justify-self: start;
  }
}

/* Small phone */
@media (max-width: 480px) {
  .chapter-head h2 {
    font-size: clamp(3.75rem, 18vw, 5.5rem);
  }

  .calc__result-grid {
    grid-template-columns: 1fr;
  }

  .calc__result-value {
    font-size: clamp(4rem, 19vw, 5.8rem);
  }

  .calc__result .cta-row,
  .scope-sheet .cta-row,
  .final .cta-row {
    align-items: stretch;
    flex-direction: column;
  }

  .calc__result .btn,
  .scope-sheet .btn,
  .final .btn {
    width: 100%;
  }

  .case-study__stats {
    grid-template-columns: 1fr;
  }

  .process-list li {
    grid-template-columns: 2rem 1fr;
  }

  .faq-item__trigger {
    grid-template-columns: 1.5rem minmax(0, 1fr) 1.5rem;
    gap: .65rem;
  }

  .faq-item__panel p {
    margin-left: 2.15rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .below *,
  .below *::before,
  .below *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (forced-colors: active) {
  .below,
  .scope-sheet,
  .calc__result,
  .chapter--contact,
  .site-footer {
    forced-color-adjust: auto;
  }
}