:root {
  color-scheme: dark;
  --page: #090c0f;
  --page-deep: #06080a;
  --surface: #121920;
  --surface-raised: #182129;
  --surface-soft: #1d2730;
  --text: #eef2f4;
  --muted: #9ca8b1;
  --border: #586671;
  --border-soft: #303a42;
  --metal: #b9c4cc;
  --platinum: #d7dfe4;
  --accent: #8fa9bb;
  --copper: #8a6758;
  --focus: #d7dfe4;
  --page-surface: #161d23;
  --reader-canvas: #080b0e;
  --header-height: 68px;
  --radius: 2px;
  --page-width: 1180px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html[data-theme="light"] {
  color-scheme: light;
  --page: #e8e6e1;
  --page-deep: #ddd9d1;
  --surface: #f3f1ec;
  --surface-raised: #faf9f6;
  --surface-soft: #e3dfd7;
  --text: #1c2328;
  --muted: #5f696f;
  --border: #7e898f;
  --border-soft: #b7bec2;
  --metal: #53616a;
  --platinum: #2f3b43;
  --accent: #526c7c;
  --copper: #7b5b4e;
  --focus: #24343e;
  --page-surface: #f5f2ea;
  --reader-canvas: #d6d2c9;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 50% -20%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 38rem),
    var(--page);
  color: var(--text);
  min-width: 320px;
}

body,
button,
select,
a {
  font: inherit;
}

a {
  color: inherit;
}

button,
select,
summary,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
select:focus-visible,
summary:focus-visible,
a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

button,
summary {
  cursor: pointer;
}

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

img,
svg {
  display: block;
  max-width: 100%;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.page-width {
  width: min(calc(100% - 40px), var(--page-width));
  margin-inline: auto;
}

.eyebrow,
.menu-kicker {
  margin: 0 0 10px;
  color: var(--metal);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: var(--header-height);
  border-bottom: 1px solid color-mix(in srgb, var(--border) 65%, transparent);
  background: color-mix(in srgb, var(--page-deep) 90%, transparent);
  backdrop-filter: blur(16px);
}

.header-inner {
  width: min(calc(100% - 28px), 1320px);
  min-height: var(--header-height);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 18px;
}

.brand-control,
.nav-link,
.theme-toggle,
.select-control select,
.mobile-menu-toggle {
  min-height: 44px;
  border: 0;
  background: transparent;
  color: var(--text);
}

.brand-control {
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 8px 0 0;
}

.brand-control::-webkit-details-marker,
.nav-dropdown summary::-webkit-details-marker {
  display: none;
}

.brand-glyph {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  color: var(--platinum);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.1rem;
}

.library-context {
  display: flex;
  align-items: center;
  gap: 9px;
  white-space: nowrap;
}

.library-name {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: .95rem;
  text-decoration: none;
}

.context-separator {
  color: var(--border);
}

.world-name {
  text-decoration: none;
  color: var(--platinum);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.05rem;
  letter-spacing: .14em;
}

.primary-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link,
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  text-decoration: none;
  color: var(--muted);
  border-bottom: 1px solid transparent;
}

.nav-link:hover,
.nav-link.is-current,
.theme-toggle:hover {
  color: var(--text);
  border-bottom-color: var(--metal);
}

.select-control select {
  padding: 0 28px 0 10px;
  color: var(--muted);
}

.menu-popover {
  position: relative;
}

.popover-panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 220px;
  padding: 10px;
  border: 1px solid var(--border);
  background: var(--surface-raised);
  box-shadow: 0 18px 40px rgba(0,0,0,.28);
}

.popover-panel a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 11px;
  color: var(--muted);
  text-decoration: none;
}

.popover-panel a:hover,
.popover-panel a:focus-visible {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 9%, transparent);
}

.stories-panel {
  min-width: 290px;
}

.nav-dropdown .popover-panel {
  right: 0;
  left: auto;
}

.menu-heading {
  margin: 0;
  padding: 0 11px 6px;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--platinum);
}

.menu-divider {
  height: 1px;
  margin: 8px 10px;
  background: var(--border-soft);
}

.mobile-menu-toggle {
  display: none;
  margin-left: auto;
  padding: 0 12px;
  font-size: 1.2rem;
}

.hero {
  position: relative;
  min-height: 620px;
  display: grid;
  align-items: end;
  overflow: hidden;
  border-bottom: 1px solid var(--border-soft);
  background: #111722;
}

.hero-landscape,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-landscape {
  background: #111722 url("images/hero-dusk-v1.webp") center 48% / cover no-repeat;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(7, 10, 15, .9) 0%, rgba(7, 10, 15, .66) 36%, rgba(7, 10, 15, .16) 66%, transparent 80%),
    linear-gradient(0deg, rgba(7, 10, 15, .58), transparent 48%);
}

html[data-theme="light"] .hero {
  background: #b7cfda;
}

html[data-theme="light"] .hero-landscape {
  background-image: url("images/hero-daylight-v1.webp");
}

html[data-theme="light"] .hero-shade {
  background:
    linear-gradient(90deg, rgba(244, 244, 237, .94) 0%, rgba(244, 244, 237, .76) 36%, rgba(244, 244, 237, .18) 66%, transparent 80%),
    linear-gradient(0deg, rgba(244, 244, 237, .36), transparent 48%);
}

.hero-inner {
  position: relative;
  z-index: 2;
  padding-block: 90px 76px;
}

.hero-copy {
  max-width: 620px;
}

.hero h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.8rem, 10vw, 7.8rem);
  font-weight: 400;
  letter-spacing: .08em;
  line-height: .9;
}

.hero-subtitle {
  margin: 20px 0 0;
  color: var(--platinum);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.5rem, 4vw, 2.4rem);
}

.hero-description {
  max-width: 46ch;
  margin: 18px 0 0;
  color: #b7c0c6;
  font-size: 1.05rem;
  line-height: 1.7;
}

html[data-theme="light"] .hero-description {
  color: #34454d;
}

html[data-theme="light"] .hero-subtitle {
  color: #2f3f47;
}

.hero-actions,
.action-row,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.hero-actions {
  margin-top: 30px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 17px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--metal);
  text-decoration: none;
}

.button:hover:not(:disabled),
.button:focus-visible {
  color: var(--text);
  border-color: var(--metal);
  background: var(--surface-raised);
}

.button--primary {
  background: linear-gradient(180deg, #25323c, #182129);
  border-color: var(--metal);
  color: var(--platinum);
}

.button--ghost {
  background: rgba(8,12,15,.3);
}

html[data-theme="light"] .button--primary {
  color: #f4f6f6;
}

html[data-theme="light"] .hero .button--ghost {
  background: rgba(239, 239, 228, .74);
  color: #34454d;
  border-color: #687780;
}

.text-link {
  color: var(--metal);
  text-underline-offset: 4px;
}

.content-section {
  padding-block: 78px;
}

.section-dark {
  border-block: 1px solid var(--border-soft);
  background: color-mix(in srgb, var(--surface) 62%, var(--page));
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 400;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
  line-height: 1.7;
}

.section-heading--split {
  max-width: none;
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: end;
}

.framed-panel,
.framed-inline {
  border: 1px solid var(--border);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--metal) 5%, transparent), transparent 28%),
    var(--surface);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--platinum) 4%, transparent);
}

.framed-panel {
  position: relative;
}

.framed-panel::before,
.framed-panel::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  pointer-events: none;
}

.framed-panel::before {
  top: 6px;
  left: 6px;
  border-top: 1px solid var(--metal);
  border-left: 1px solid var(--metal);
}

.framed-panel::after {
  right: 6px;
  bottom: 6px;
  border-right: 1px solid var(--metal);
  border-bottom: 1px solid var(--metal);
}

.feature-book {
  display: grid;
  grid-template-columns: minmax(210px, 300px) 1fr;
  gap: clamp(28px, 6vw, 70px);
  align-items: center;
  padding: clamp(24px, 5vw, 54px);
}

.book-cover {
  aspect-ratio: 2 / 3;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--metal);
  background: #05070b;
  box-shadow: 16px 18px 35px rgba(0,0,0,.2);
}

.book-cover img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 3;
  object-fit: cover;
}

.feature-book-copy h3,
.download-card h3,
.update-item h3 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  color: var(--platinum);
}

.feature-book-copy h3 {
  font-size: clamp(2rem, 5vw, 3rem);
}

.feature-book-copy p,
.download-card p,
.update-item p {
  color: var(--muted);
  line-height: 1.7;
}

.lexicon-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.lexicon-card {
  min-height: 160px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
}

.lexicon-card:hover {
  border-color: var(--metal);
  background: var(--surface-raised);
}

.lexicon-symbol {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--metal);
  font-size: 2rem;
}

.spoiler-control {
  min-width: 190px;
  padding: 13px 16px;
  color: var(--muted);
}

.spoiler-control strong {
  display: block;
  color: var(--text);
  margin-top: 3px;
}

.download-card {
  padding: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
}

.updates-list {
  display: grid;
  gap: 16px;
}

.update-item {
  padding: 26px;
}

.update-item time {
  color: var(--metal);
  font-size: .8rem;
}

.site-footer {
  margin-block: 36px;
  padding: 18px;
  border: 1px solid var(--border-soft);
  background: var(--page-deep);
}

.k2040-footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.k2040-footer-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 12px;
  border: 1px solid transparent;
  border-bottom-color: var(--border);
  color: var(--muted);
  text-decoration: none;
}

.k2040-footer-link--icon-only {
  width: 44px;
  padding: 0;
}

.k2040-footer-link:hover,
.k2040-footer-link:focus-visible {
  border-color: var(--border);
  background: var(--surface);
  color: var(--text);
}

.k2040-icon {
  display: inline-flex;
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  align-items: center;
  justify-content: center;
}

.k2040-icon svg {
  width: 100%;
  height: 100%;
}

.k2040-icon--main {
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
}

/* Reader */

.reader-page {
  min-height: 100%;
  background: var(--reader-canvas);
}

.reader-header {
  position: sticky;
  top: 0;
  z-index: 70;
  min-height: 58px;
  border-bottom: 1px solid var(--border-soft);
  background: color-mix(in srgb, var(--page-deep) 94%, transparent);
  backdrop-filter: blur(12px);
}

.reader-header-inner {
  min-height: 58px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding-inline: 16px;
}

.reader-home {
  text-decoration: none;
  color: var(--metal);
}

.reader-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: Georgia, "Times New Roman", serif;
}

.reader-tools {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.reader-tool {
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border-soft);
  background: var(--surface);
  color: var(--muted);
}

.reader-tool:hover,
.reader-tool[aria-pressed="true"] {
  color: var(--text);
  border-color: var(--metal);
}

.reader-shell {
  position: relative;
  min-height: 760px;
  padding: 54px 48px 70px 84px;
}

.toc-dock {
  position: absolute;
  top: 30px;
  left: 18px;
  z-index: 40;
}

.toc-toggle {
  width: 48px;
  height: 48px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--metal);
  font-size: 1.25rem;
}

.toc-panel {
  position: absolute;
  left: 0;
  top: 0;
  width: min(320px, calc(100vw - 36px));
  min-height: 480px;
  padding: 66px 14px 18px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface-raised) 97%, transparent);
  box-shadow: 20px 20px 48px rgba(0,0,0,.3);
  transform: translateX(calc(-100% - 20px));
  opacity: 0;
  pointer-events: none;
  transition: transform 140ms ease, opacity 140ms ease;
}

.toc-dock.is-open .toc-panel,
.toc-dock.is-pinned .toc-panel {
  transform: translateX(0);
  opacity: 1;
  pointer-events: auto;
}

.toc-dock.is-open .toc-toggle,
.toc-dock.is-pinned .toc-toggle {
  position: relative;
  z-index: 2;
  border-color: var(--metal);
  color: var(--text);
}

.toc-heading {
  margin: 0 10px 12px;
  color: var(--metal);
  font-size: .74rem;
  letter-spacing: .15em;
  text-transform: uppercase;
}

.toc-list {
  display: grid;
  gap: 4px;
}

.toc-list button {
  width: 100%;
  min-height: 44px;
  padding: 9px 12px;
  border: 0;
  border-left: 2px solid transparent;
  background: transparent;
  color: var(--muted);
  text-align: left;
}

.toc-list button:hover,
.toc-list button.is-active {
  color: var(--text);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  border-left-color: var(--metal);
}

.book-stage {
  width: min(100%, 1040px);
  margin-inline: auto;
}

.book-spread {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--border-soft);
  background: var(--border-soft);
  box-shadow: 0 28px 70px rgba(0,0,0,.28);
}

.book-spread.single {
  max-width: 620px;
  grid-template-columns: 1fr;
  margin-inline: auto;
}

.book-spread.continuous {
  max-width: 760px;
  grid-template-columns: 1fr;
  gap: 24px;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.book-page {
  min-height: 650px;
  padding: clamp(34px, 5vw, 62px);
  background:
    linear-gradient(90deg, rgba(255,255,255,.012), transparent 8%, transparent 92%, rgba(0,0,0,.06)),
    var(--page-surface);
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.75;
}

.book-spread.continuous .book-page {
  min-height: auto;
  border: 1px solid var(--border-soft);
}

.book-page h1,
.book-page h2 {
  font-weight: 400;
}

.book-page h1 {
  margin: 0 0 10px;
  font-size: clamp(2.1rem, 5vw, 3.5rem);
}

.book-page h2 {
  margin: 0 0 28px;
  color: var(--metal);
  font-size: 1.1rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.book-page p {
  margin: 0 0 1.05em;
}

.contents-page {
  display: flex;
  flex-direction: column;
}

.contents-list {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.contents-list button {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border: 0;
  border-bottom: 1px solid var(--border-soft);
  background: transparent;
  color: var(--text);
  font-family: inherit;
  text-align: left;
}

.contents-list button:hover {
  color: var(--metal);
}

.reader-status {
  max-width: 1040px;
  margin: 16px auto 0;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
  font-size: .8rem;
}

@media (max-width: 1199px) {
  .header-inner {
    position: relative;
    flex-wrap: nowrap;
  }

  .mobile-menu-toggle {
    display: inline-flex;
    align-items: center;
  }

  .primary-nav {
    position: absolute;
    z-index: 20;
    top: 100%;
    right: 0;
    left: auto;
    width: min(380px, 100%);
    max-height: calc(100vh - var(--header-height) - 16px);
    max-height: calc(100dvh - var(--header-height) - 16px);
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 14px;
    overflow-y: auto;
    overscroll-behavior: contain;
    border: 1px solid var(--border-soft);
    background: var(--page-deep);
    box-shadow: 0 18px 40px rgba(0,0,0,.34);
  }

  .primary-nav.is-open {
    display: flex;
  }

  .nav-link,
  .theme-toggle,
  .select-control select {
    width: 100%;
    justify-content: flex-start;
    min-height: 48px;
  }

  .nav-dropdown .popover-panel,
  .popover-panel {
    position: static;
    min-width: 0;
    margin: 0 10px 10px;
    box-shadow: none;
  }

  .global-menu > .global-panel {
    position: absolute;
    z-index: 30;
    top: calc(100% + 8px);
    left: 0;
    width: min(220px, calc(100vw - 28px));
    min-width: 0;
    max-height: calc(100vh - var(--header-height) - 16px);
    max-height: calc(100dvh - var(--header-height) - 16px);
    margin: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    box-shadow: 0 18px 40px rgba(0,0,0,.34);
  }

}

@media (max-width: 980px) {

  .hero {
    min-height: 560px;
  }

  .lexicon-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .reader-shell {
    padding: 68px 20px 50px;
  }

  .toc-dock {
    top: 12px;
    left: 12px;
  }

  .book-spread {
    max-width: 650px;
    grid-template-columns: 1fr;
    margin-inline: auto;
  }

  .book-page:nth-child(2) {
    display: none;
  }

  .book-spread.continuous .book-page:nth-child(2) {
    display: block;
  }
}

@media (max-width: 700px) {
  .page-width {
    width: min(calc(100% - 28px), var(--page-width));
  }

  .library-name {
    display: none;
  }

  .context-separator {
    display: none;
  }

  .hero {
    min-height: 520px;
  }

  .hero-shade {
    background:
      linear-gradient(0deg, rgba(5,7,9,.94), rgba(5,7,9,.25) 65%),
      linear-gradient(90deg, rgba(5,7,9,.65), transparent);
  }

  .hero-inner {
    padding-block: 110px 54px;
  }

  .content-section {
    padding-block: 58px;
  }

  .feature-book {
    grid-template-columns: 1fr;
  }

  .book-cover {
    width: min(72vw, 280px);
    margin-inline: auto;
  }

  .section-heading--split,
  .download-card {
    align-items: stretch;
    flex-direction: column;
  }

  .spoiler-control {
    min-width: 0;
  }

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

  .reader-header-inner {
    flex-wrap: wrap;
  }

  .reader-tools {
    width: 100%;
    margin-left: 0;
    overflow-x: auto;
    padding-bottom: 8px;
  }

  .reader-tool {
    flex: 0 0 auto;
  }

  .book-page {
    min-height: 560px;
    padding: 34px 26px;
  }
}

@media (hover: hover) and (pointer: fine) {
  .toc-dock:hover .toc-panel {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
  }
}

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