.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 20;
  border-block-end: 1px solid var(--color-header-separator);
  background: rgba(5, 6, 5, 0.94);
  transition: background-color var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard);
}

.site-header.is-scrolled,
body.is-menu-open .site-header {
  border-block-end-color: var(--color-header-separator-strong);
  background: rgba(5, 6, 5, 0.99);
}

.site-header__inner {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-header__nav-group {
  display: flex;
  align-items: center;
  margin-inline-start: auto;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-brand {
  color: var(--color-text-primary);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}

.site-header .site-brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.28rem;
}

.site-brand__name {
  display: block;
  letter-spacing: 0.12em;
  line-height: 0.95;
  text-transform: uppercase;
}

.site-brand__initial {
  font-size: 1.12em;
}

.site-brand__small {
  font-size: 0.72em;
}

.site-brand__role {
  display: block;
  align-self: center;
  color: var(--color-warm-structural);
  font-family: var(--font-body);
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.36em;
  line-height: 1;
  text-transform: uppercase;
}

.site-brand--footer {
  display: inline-block;
  margin-block-end: var(--space-2);
}

.menu-toggle {
  display: inline-flex;
  min-width: 3rem;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
}

.menu-toggle__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.menu-toggle__lines,
.menu-toggle__lines::before,
.menu-toggle__lines::after {
  display: block;
  width: 1.35rem;
  height: 2px;
  border-radius: 999px;
  background: var(--color-text-primary);
  transition: transform var(--duration-fast) var(--ease-standard), opacity var(--duration-fast) var(--ease-standard);
}

.menu-toggle__lines {
  position: relative;
}

.menu-toggle__lines::before,
.menu-toggle__lines::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
}

.menu-toggle__lines::before {
  transform: translateY(-0.45rem);
}

.menu-toggle__lines::after {
  transform: translateY(0.45rem);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__lines {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__lines::before {
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__lines::after {
  transform: rotate(-45deg);
}

.primary-nav {
  position: absolute;
  inset-block-start: calc(100% + 1px);
  inset-inline: 0;
  border-block-end: var(--border-subtle);
  background: rgba(5, 6, 5, 0.99);
}

.js .primary-nav {
  display: none;
}

.js .primary-nav.is-open {
  display: block;
}

.primary-nav__list {
  display: grid;
  gap: var(--space-1);
  width: min(100% - 2rem, var(--width-content));
  margin-inline: auto;
  padding: var(--space-4) 0;
  list-style: none;
}

.primary-nav__item {
  position: relative;
}

.primary-nav__link {
  position: relative;
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: 0;
  padding: var(--space-2) var(--space-3);
  text-align: start;
  text-decoration: none;
  cursor: pointer;
}

.primary-nav__link:hover,
.primary-nav__link:focus-visible,
.primary-nav__button[aria-expanded="true"] {
  color: var(--color-warm-primary);
}

.primary-nav__link[aria-current="page"],
.primary-nav__button--current {
  color: var(--color-warm-structural);
}

.primary-nav__button--current[aria-expanded="true"] {
  color: var(--color-warm-structural);
}

.primary-nav__link[aria-current="page"]::after,
.primary-nav__button--current::after {
  content: "";
  position: absolute;
  inset-block-end: 0.4rem;
  inset-inline: var(--space-3);
  height: 1px;
  background: currentColor;
}

.series-nav {
  display: block;
  margin: var(--space-2) 0 var(--space-3);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--color-bg-elevated);
  padding: var(--space-4);
  box-shadow: var(--shadow-soft);
}

.js .series-nav {
  display: none;
}

.js .series-nav.is-open {
  display: block;
}

.series-nav__label {
  margin-block-end: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.series-nav__list {
  display: grid;
  gap: var(--space-2);
  padding: 0;
  list-style: none;
}

.series-nav__list a,
.series-nav__buy-link {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  gap: var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  padding: var(--space-2);
  text-decoration: none;
}

.series-nav__list span {
  color: var(--color-warm-editorial);
  font-size: var(--text-xs);
  font-weight: 800;
}

.series-nav__list a:hover,
.series-nav__list a:focus-visible,
.series-nav__buy-link:hover,
.series-nav__buy-link:focus-visible {
  background: rgba(241, 238, 230, 0.07);
  color: var(--color-text-primary);
}

.series-nav__buy-link {
  margin-block-start: var(--space-3);
  border-block-start: var(--border-subtle);
  border-radius: 0;
  color: var(--color-warm-editorial);
  font-weight: 800;
}

.eyebrow {
  margin-block-end: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.eyebrow--blue {
  color: var(--color-accent-blue-soft);
}

.eyebrow--gold {
  color: var(--color-warm-editorial);
}

.eyebrow--muted {
  color: var(--color-text-muted);
}

.heading-group {
  max-width: var(--width-text);
}

.heading-group h2 {
  margin-block-end: var(--space-4);
}

.heading-group p {
  color: var(--color-text-secondary);
}

.heading-group .eyebrow--blue {
  color: var(--color-accent-blue-soft);
}

.status-label {
  display: inline-flex;
  margin-block-end: var(--space-4);
  border-inline-start: 2px solid currentColor;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 800;
  padding-inline-start: var(--space-3);
  text-transform: uppercase;
}

.status-label--available {
  color: var(--color-warm-editorial);
}

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.1rem;
  font-size: var(--text-sm);
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
}

.button--primary {
  border-color: rgb(var(--rgb-warm-primary) / 0.82);
  background: linear-gradient(180deg, rgb(var(--rgb-warm-primary-bright) / 0.96), rgb(var(--rgb-warm-primary-deep) / 0.96));
  color: #11100d;
}

.button--primary:hover,
.button--primary:focus-visible {
  color: #050605;
  transform: translateY(-1px);
}

.button--secondary {
  background: rgba(241, 238, 230, 0.04);
  color: var(--color-text-primary);
}

.button--secondary:hover,
.button--secondary:focus-visible {
  background: rgba(241, 238, 230, 0.1);
  color: var(--color-text-primary);
}

.button--full {
  width: 100%;
}

.scroll-cue {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 800;
  text-decoration: none;
}

.scroll-cue::after {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  margin-inline-start: var(--space-2);
  border-inline-end: 2px solid currentColor;
  border-block-end: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
}

.media-placeholder {
  display: grid;
  min-height: 18rem;
  overflow: hidden;
  place-items: center;
  border: 1px solid rgba(139, 184, 207, 0.24);
  border-radius: var(--radius-md);
  background:
    linear-gradient(135deg, rgba(94, 155, 189, 0.18), transparent 42%),
    linear-gradient(315deg, rgb(var(--rgb-warm-editorial) / 0.16), transparent 46%),
    rgba(241, 238, 230, 0.035);
  color: var(--color-text-muted);
  aspect-ratio: 4 / 5;
  padding: var(--space-5);
  text-align: center;
}

.media-placeholder--portrait {
  aspect-ratio: 4 / 5;
}

.media-placeholder__caption {
  margin-block-start: var(--space-3);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.45;
}

.book-feature {
  overflow: hidden;
  background:
    radial-gradient(circle at 85% 22%, rgba(94, 155, 189, 0.1), transparent 30rem),
    var(--color-bg-primary);
}

.book-feature__layout {
  display: grid;
  gap: var(--space-7);
}

.book-feature__content {
  max-width: var(--width-text);
}

.book-feature__title {
  font-size: var(--text-book-title);
  margin-block-end: var(--space-4);
}

.book-feature__premise {
  color: var(--color-text-primary);
  font-size: var(--text-md);
}

.book-feature__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-block-start: var(--space-6);
}

.book-media {
  margin: 0;
}

.book-media--reader {
  display: grid;
  min-height: clamp(20rem, 58vw, 31rem);
  place-items: center;
}

.book-media__reader {
  width: min(76vw, 18rem);
  height: auto;
  filter: drop-shadow(0 1.3rem 2.3rem rgba(0, 0, 0, 0.36));
}

.illuminated-path {
  position: absolute;
  inset-block-end: -6rem;
  inset-inline-end: max(1rem, calc((100vw - var(--width-wide)) / 2));
  z-index: -1;
  width: min(13rem, 34vw);
  color: var(--color-accent-blue);
  opacity: 0.28;
  pointer-events: none;
}

.illuminated-path path,
.illuminated-path circle {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

.illuminated-path circle {
  fill: currentColor;
}

.illuminated-path--gold {
  color: var(--color-warm-primary);
}

.illuminated-path--transition {
  color: var(--color-warm-editorial);
}

.atmospheric-layer {
  position: absolute;
  inset: 0;
  z-index: -2;
  pointer-events: none;
}

.atmospheric-layer--blue {
  background:
    radial-gradient(circle at 78% 34%, rgba(94, 155, 189, 0.16), transparent 28rem),
    radial-gradient(circle at 38% 80%, rgb(var(--rgb-warm-editorial) / 0.08), transparent 24rem);
}

.section--gold-separator {
  box-shadow: inset 0 -1px 0 rgb(var(--rgb-warm-editorial) / 0.24);
}

.future-series__layout {
  display: grid;
  gap: var(--space-6);
}

.future-series__markers {
  display: grid;
  gap: var(--space-4);
}

.future-book-marker {
  position: relative;
  border-block-start: var(--border-subtle);
  padding-block-start: var(--space-4);
}

.future-book-marker::before {
  content: "";
  position: absolute;
  inset-block-start: -1px;
  inset-inline-start: 0;
  width: var(--space-6);
  height: 1px;
  background: var(--color-warm-editorial);
  opacity: 0.72;
}

.future-book-marker__sequence {
  margin-block-end: var(--space-3);
  color: var(--color-accent-blue-soft);
  font-size: var(--text-xs);
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.future-book-marker p:last-child {
  color: var(--color-text-secondary);
}

.author-preview__layout,
.signup__layout {
  display: grid;
  gap: var(--space-6);
}

.author-preview__portrait {
  margin: 0;
}

.author-portrait__image {
  width: min(100%, 26rem);
  height: auto;
  border: 1px solid rgba(139, 184, 207, 0.24);
  border-radius: var(--radius-md);
  background: rgba(241, 238, 230, 0.035);
  box-shadow: var(--shadow-soft);
}

.author-preview__content .button {
  margin-block-start: var(--space-6);
}

.signup-form {
  display: grid;
  gap: var(--space-4);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  background: rgba(5, 6, 5, 0.38);
  padding: clamp(1rem, 4vw, 2rem);
}

.signup-form__privacy,
.signup-form__states {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.form-message {
  margin-block-end: var(--space-2);
  border-inline-start: 2px solid currentColor;
  padding-inline-start: var(--space-3);
}

.form-message--success {
  color: var(--color-success);
}

.form-message--error {
  color: var(--color-error);
}

.final-cta {
  background:
    radial-gradient(circle at 50% 0%, rgb(var(--rgb-warm-editorial) / 0.1), transparent 28rem),
    var(--color-bg-primary);
  text-align: center;
}

.final-cta__inner h2 {
  margin-block-end: var(--space-5);
}

.final-cta__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
}

.site-footer {
  border-block-start: 1px solid var(--color-header-separator);
  background: #030403;
  color: var(--color-text-secondary);
  padding-block-start: clamp(var(--space-7), 7vw, var(--space-9));
}

.site-footer__inner {
  display: grid;
  gap: clamp(var(--space-6), 6vw, var(--space-8));
  padding-block-end: clamp(var(--space-7), 6vw, var(--space-9));
}

.site-footer__section {
  min-width: 0;
}

.site-footer__brand {
  max-width: 23rem;
}

.site-footer .site-brand {
  display: inline-block;
  margin-block-end: var(--space-4);
  color: var(--color-text-primary);
  font-size: var(--text-xl);
}

.site-footer .site-brand::after {
  content: "";
  display: block;
  width: min(100%, 13rem);
  height: 1px;
  margin-block-start: var(--space-4);
  background:
    linear-gradient(90deg, rgb(var(--rgb-warm-editorial) / 0.72), rgb(var(--rgb-warm-editorial) / 0.72)) 0 0 / calc(50% - 1rem) 1px no-repeat,
    linear-gradient(90deg, rgb(var(--rgb-warm-editorial) / 0.72), rgb(var(--rgb-warm-editorial) / 0.72)) 100% 0 / calc(50% - 1rem) 1px no-repeat;
}

.site-footer .site-brand__name {
  letter-spacing: 0.14em;
}

.site-footer__brand p,
.site-footer__small {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

.site-footer__brand p {
  margin-block-end: 0;
}

.site-footer__heading {
  margin-block-end: var(--space-4);
  color: var(--color-warm-editorial);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-transform: uppercase;
}

.site-footer__link-list,
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-5);
  padding: 0;
  list-style: none;
}

.site-footer__link-list {
  display: grid;
  gap: var(--space-3);
}

.site-footer__book-list {
  gap: 0;
}

.site-footer__book-list li + li {
  border-block-start: 1px solid rgb(var(--rgb-warm-editorial) / 0.18);
}

.site-footer__book-list a {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding-block: var(--space-3);
  padding-inline-end: 1.6rem;
}

.site-footer__book-list a::after {
  content: "";
  position: absolute;
  inset-inline-end: 0.25rem;
  width: 0.48rem;
  height: 0.48rem;
  border-inline-end: 1px solid currentColor;
  border-block-end: 1px solid currentColor;
  opacity: 0.72;
  transform: rotate(-45deg);
}

.site-footer a,
.site-footer__inactive-link {
  color: var(--color-text-secondary);
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 500;
  line-height: 1.25;
  text-decoration: none;
}

.site-footer__inactive-link {
  color: var(--color-text-muted);
}

.social-links--header {
  flex-wrap: nowrap;
  gap: var(--space-2);
}

.site-footer .social-links--footer {
  gap: var(--space-3);
}

.site-footer .social-link--icon {
  width: 3.25rem;
  min-width: 3.25rem;
  height: 3.25rem;
  border-color: rgb(var(--rgb-warm-editorial) / 0.34);
  background: transparent;
  color: var(--color-text-primary);
}

.site-footer .social-link--icon svg {
  width: 1.25rem;
  height: 1.25rem;
}

.social-link--icon {
  display: inline-grid;
  width: 2.35rem;
  min-width: 2.35rem;
  height: 2.35rem;
  place-items: center;
  border: 1px solid rgba(241, 238, 230, 0.26);
  border-radius: 50%;
  background: rgba(241, 238, 230, 0.055);
  color: var(--color-text-primary);
}

.social-link--icon svg {
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.social-link--icon:first-child svg {
  fill: currentColor;
  stroke: none;
}

.site-footer a:hover,
.site-footer a:focus-visible,
.site-footer .social-links a:hover,
.site-footer .social-links a:focus-visible {
  color: var(--color-warm-editorial);
}

.site-footer .social-link--icon:hover,
.site-footer .social-link--icon:focus-visible {
  border-color: rgb(var(--rgb-warm-editorial) / 0.58);
}

.site-footer__lower {
  border-block-start: 1px solid var(--color-header-separator);
  padding-block: var(--space-5);
  text-align: center;
}

.site-footer__lower .site-footer__small {
  margin: 0;
  font-family: var(--font-display);
}

@media (max-width: 63.99rem) {
  .social-links--header {
    display: none;
  }
}

@media (min-width: 48rem) {
  .site-header .site-brand {
    font-size: var(--text-xl);
  }

  .site-footer__inner {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }

  .author-preview__layout,
  .signup__layout,
  .future-series__layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .future-series__markers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .button--full {
    width: auto;
  }
}

@media (min-width: 64rem) {
  .site-header__nav-group {
    gap: var(--space-5);
  }

  .site-footer__inner {
    grid-template-columns: minmax(13rem, 0.95fr) minmax(18rem, 1.1fr) minmax(12rem, 0.8fr) minmax(8rem, 0.55fr);
    align-items: start;
  }

  .menu-toggle {
    display: none;
  }

  .primary-nav,
  .js .primary-nav {
    position: static;
    display: block;
    border: 0;
    background: transparent;
  }

  .primary-nav__list {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    width: auto;
    padding: 0;
  }

  .primary-nav__link {
    width: auto;
    justify-content: center;
    padding-inline: var(--space-3);
  }

  .book-media--reader {
    min-height: clamp(24rem, 36vw, 32rem);
    justify-items: end;
  }

  .book-media__reader {
    width: min(80%, 21rem);
  }

  .series-nav,
  .js .series-nav {
    position: absolute;
    inset-block-start: calc(100% + var(--space-2));
    inset-inline-end: 0;
    display: none;
    width: 20rem;
    margin: 0;
  }

  .js .series-nav.is-open,
  .no-js .primary-nav__item--has-submenu:focus-within .series-nav,
  .no-js .primary-nav__item--has-submenu:hover .series-nav {
    display: block;
  }

  .book-feature__layout {
    --book-feature-inner-inset: clamp(var(--space-7), 5vw, var(--space-9));
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: center;
  }

  .book-feature__content {
    padding-inline-start: var(--book-feature-inner-inset);
  }

  .book-feature__media {
    padding-inline-end: var(--book-feature-inner-inset);
  }

  .book-feature {
    padding-block: clamp(4.5rem, 7vw, 6.5rem);
  }

  .book-feature--reverse .book-feature__content {
    grid-column: 2;
    padding-inline: 0 var(--book-feature-inner-inset);
  }

  .book-feature--reverse .book-feature__media {
    grid-column: 1;
    grid-row: 1;
    justify-items: start;
    padding-inline: var(--book-feature-inner-inset) 0;
  }
}