:root {
  --ink: #0c0a0c;
  --amaranth: #d11d54;
  --ash: #b8b0b4;
  --ash-bright: #d8d1d5;
  --display: "Cormorant Garamond", Georgia, serif;
  --reading: "Source Serif 4", Georgia, serif;
  --measure: 68ch;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--ink);
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0 0 7.5rem;
  overflow-x: hidden;
  background: var(--ink);
  color: var(--ash);
  font-family: var(--reading);
  font-size: 19px;
  line-height: 1.62;
}

a {
  color: var(--ash-bright);
  text-decoration-color: var(--amaranth);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:hover {
  text-decoration-thickness: 3px;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--ash-bright);
  outline-offset: 4px;
}

p,
li {
  max-width: var(--measure);
}

button {
  font: inherit;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 5.5rem;
  padding: 1rem clamp(1.25rem, 4vw, 4.5rem);
  border-bottom: 1px solid var(--amaranth);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--ash-bright);
  font-family: var(--display);
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.site-header__note {
  margin: 0;
  font-size: 0.86rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.32fr);
  min-height: 74vh;
  border-bottom: 1px solid var(--amaranth);
}

.hero__copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
  padding: clamp(2.5rem, 6vw, 7rem) clamp(1.25rem, 4vw, 4.5rem);
}

.hero__eyebrow,
.section__eyebrow,
.callout__label,
.source-card__type,
.comparison__label,
.page-turn__label {
  margin: 0 0 1rem;
  color: var(--ash-bright);
  font-family: var(--reading);
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.hero__eyebrow {
  font-size: 1rem;
  letter-spacing: 0.1em;
}

.hero__title {
  max-width: 12ch;
  margin: 0;
  color: var(--ash-bright);
  font-family: var(--display);
  font-size: clamp(4.6rem, 11.4vw, 12rem);
  font-weight: 400;
  letter-spacing: -0.065em;
  line-height: 0.77;
  text-wrap: balance;
}

.hero__intro {
  max-width: 46rem;
  margin: clamp(3rem, 8vw, 8rem) 0 0;
  font-size: clamp(1.2rem, 1.65vw, 1.55rem);
  line-height: 1.48;
}

.hero__aside {
  display: flex;
  min-width: 0;
  align-items: flex-end;
  padding: 2rem;
  border-left: 1px solid var(--amaranth);
}

.hero__art {
  width: 100%;
  height: auto;
  color: var(--amaranth);
}

.hero__art path,
.hero__art circle,
.hero__art line,
.hero__art polyline,
.hero__art rect {
  vector-effect: non-scaling-stroke;
}

.chapter {
  display: grid;
  grid-template-columns: minmax(12rem, 0.28fr) minmax(0, 1fr);
  border-bottom: 1px solid var(--amaranth);
}

.chapter__rail {
  padding: clamp(2rem, 4vw, 4.5rem);
  border-right: 1px solid var(--amaranth);
}

.chapter__rail-text {
  position: sticky;
  top: 2rem;
  margin: 0;
  color: var(--ash-bright);
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 4.5rem);
  font-weight: 400;
  line-height: 0.95;
}

.chapter__body {
  min-width: 0;
  padding: clamp(3rem, 7vw, 8rem) clamp(1.25rem, 7vw, 8rem);
}

.section {
  max-width: 64rem;
  margin: 0 0 clamp(5rem, 9vw, 10rem);
}

.section:last-child {
  margin-bottom: 0;
}

.section__title {
  max-width: 17ch;
  margin: 0 0 2rem;
  color: var(--ash-bright);
  font-family: var(--display);
  font-size: clamp(2.9rem, 6.2vw, 6.6rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.9;
  text-wrap: balance;
}

.section__lead {
  max-width: 54ch;
  margin: 0 0 2.5rem;
  font-size: clamp(1.18rem, 1.8vw, 1.55rem);
}

.section__text {
  margin: 0 0 1.35rem;
}

.section__text > a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
}

.section__list,
.checklist,
.signal-list {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.section__list li,
.checklist__item,
.signal-list__item {
  position: relative;
  padding: 1.25rem 0 1.25rem 2rem;
  border-top: 1px solid color-mix(in srgb, var(--amaranth) 70%, transparent);
}

.section__list li::before,
.checklist__item::before,
.signal-list__item::before {
  position: absolute;
  top: 1.55rem;
  left: 0;
  width: 0.65rem;
  height: 0.65rem;
  border: 1px solid var(--amaranth);
  border-radius: 50%;
  content: "";
}

.callout {
  max-width: 48rem;
  margin: 2.5rem 0;
  padding: 1.6rem 1.8rem;
  border-top: 1px solid var(--amaranth);
  border-bottom: 1px solid var(--amaranth);
}

.callout__text {
  margin: 0;
  color: var(--ash-bright);
  font-family: var(--display);
  font-size: clamp(1.7rem, 3vw, 2.8rem);
  line-height: 1.08;
}

.path-grid,
.source-grid,
.cost-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: 70rem;
  margin: 2.5rem 0 0;
  background: var(--amaranth);
  border: 1px solid var(--amaranth);
}

.path-card,
.source-card,
.cost-card {
  min-width: 0;
  padding: clamp(1.4rem, 3vw, 2.6rem);
  background: var(--ink);
}

.path-card__title,
.source-card__title,
.cost-card__title {
  margin: 0 0 1rem;
  color: var(--ash-bright);
  font-family: var(--display);
  font-size: clamp(1.8rem, 3.2vw, 3rem);
  font-weight: 400;
  line-height: 1;
}

.path-card__text,
.source-card__text,
.cost-card__text {
  margin: 0 0 1rem;
}

.path-card__link,
.source-card__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 0.5rem;
}

.comparison {
  max-width: 72rem;
}

.comparison__controls {
  display: none;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0 0 2rem;
}

.has-js .comparison__controls {
  display: flex;
}

.comparison__button {
  min-height: 48px;
  padding: 0.65rem 1.2rem;
  border: 1px solid var(--amaranth);
  background: transparent;
  color: var(--ash-bright);
  cursor: pointer;
}

.comparison__button[aria-pressed="true"] {
  background: var(--ash);
  color: var(--ink);
}

.comparison__panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--amaranth);
  border-left: 1px solid var(--amaranth);
}

.comparison__lane {
  min-width: 0;
  padding: clamp(1.4rem, 3vw, 2.5rem);
  border-right: 1px solid var(--amaranth);
  border-bottom: 1px solid var(--amaranth);
}

.comparison__title {
  margin: 0 0 1rem;
  color: var(--ash-bright);
  font-family: var(--display);
  font-size: clamp(2rem, 3.4vw, 3.6rem);
  font-weight: 400;
  line-height: 0.95;
}

.comparison__summary,
.comparison__detail {
  margin: 0 0 1.2rem;
}

.comparison__detail[hidden] {
  display: none;
}

.question-stack {
  max-width: 62rem;
  margin: 2.5rem 0 0;
  counter-reset: question;
}

.question-card {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr);
  padding: 2rem 0;
  border-top: 1px solid var(--amaranth);
  counter-increment: question;
}

.question-card::before {
  color: var(--amaranth);
  font-family: var(--display);
  font-size: 2.3rem;
  content: counter(question, lower-roman);
}

.question-card__title {
  margin: 0 0 0.7rem;
  color: var(--ash-bright);
  font-family: var(--display);
  font-size: clamp(1.7rem, 3vw, 2.7rem);
  font-weight: 400;
  line-height: 1.05;
}

.question-card__text {
  margin: 0;
}

.page-turn {
  display: block;
  min-height: 11rem;
  padding: clamp(2rem, 5vw, 5rem) clamp(1.25rem, 4vw, 4.5rem);
  color: var(--ash-bright);
  text-decoration: none;
  border-bottom: 1px solid var(--amaranth);
}

.page-turn:hover .page-turn__title {
  transform: translateX(0.12em);
}

.page-turn__title {
  display: block;
  max-width: 18ch;
  font-family: var(--display);
  font-size: clamp(2.4rem, 5.5vw, 6rem);
  line-height: 0.92;
  transition: transform 180ms ease;
}

.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.4fr);
  gap: 3rem;
  padding: clamp(3rem, 6vw, 6rem) clamp(1.25rem, 4vw, 4.5rem);
}

.site-footer__statement {
  max-width: 32ch;
  margin: 0;
  color: var(--ash-bright);
  font-family: var(--display);
  font-size: clamp(1.8rem, 3.2vw, 3.2rem);
  line-height: 1.05;
}

.site-footer__links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-content: start;
  gap: 0.25rem 1rem;
}

.site-footer__link {
  display: flex;
  min-height: 46px;
  align-items: center;
}

.bottom-dock {
  position: fixed;
  z-index: 20;
  right: 50%;
  bottom: 1rem;
  display: grid;
  grid-template-columns: repeat(5, minmax(5.5rem, 1fr));
  width: min(48rem, calc(100% - 2rem));
  border: 1px solid var(--amaranth);
  background: color-mix(in srgb, var(--ink) 94%, transparent);
  box-shadow: 0 0.9rem 2rem rgba(0, 0, 0, 0.5);
  transform: translateX(50%);
  backdrop-filter: blur(12px);
}

.bottom-dock__link {
  display: flex;
  min-height: 60px;
  align-items: center;
  justify-content: center;
  padding: 0.55rem;
  color: var(--ash-bright);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-align: center;
  text-decoration: none;
  border-right: 1px solid var(--amaranth);
}

.bottom-dock__link:last-child {
  border-right: 0;
}

.bottom-dock__link[aria-current="page"] {
  background: var(--ash);
  color: var(--ink);
}

.error-page {
  display: grid;
  min-height: 72vh;
  place-items: center;
  padding: 2rem;
  text-align: center;
}

.error-page__title {
  margin: 0;
  color: var(--ash-bright);
  font-family: var(--display);
  font-size: clamp(5rem, 18vw, 15rem);
  font-weight: 400;
  letter-spacing: -0.06em;
  line-height: 0.8;
}

.error-page__text {
  max-width: 38ch;
  margin: 2rem auto;
}

.error-page__link {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  padding: 0.5rem 1rem;
  border: 1px solid var(--amaranth);
}

@media (max-width: 860px) {
  body {
    font-size: 18px;
  }

  .hero,
  .chapter,
  .site-footer {
    grid-template-columns: 1fr;
  }

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

  .hero__aside {
    min-height: 15rem;
    border-top: 1px solid var(--amaranth);
    border-left: 0;
  }

  .hero__art {
    max-width: 20rem;
  }

  .chapter__rail {
    border-right: 0;
    border-bottom: 1px solid var(--amaranth);
  }

  .chapter__rail-text {
    position: static;
  }

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

  .path-grid,
  .source-grid,
  .cost-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  body {
    padding-bottom: 6.8rem;
    font-size: 17px;
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.25rem;
  }

  .site-header__note {
    font-size: 0.76rem;
  }

  .hero {
    min-height: auto;
  }

  .hero__copy {
    min-height: 33rem;
  }

  .hero__title {
    font-size: clamp(3.7rem, 19vw, 5.3rem);
    line-height: 0.81;
  }

  .hero__intro {
    font-size: 1.1rem;
  }

  .section__title {
    font-size: clamp(2.8rem, 14vw, 4.4rem);
  }

  .question-card {
    grid-template-columns: 2.5rem minmax(0, 1fr);
  }

  .site-footer__links {
    grid-template-columns: 1fr;
  }

  .bottom-dock {
    bottom: 0.5rem;
    grid-template-columns: repeat(5, 1fr);
    width: calc(100% - 1rem);
  }

  .bottom-dock__link {
    min-width: 0;
    min-height: 62px;
    padding: 0.35rem 0.15rem;
    font-size: 0.8rem;
    letter-spacing: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}