:root {
  color-scheme: light;
  --text: #1a1a1a;
  --muted: #555;
  --bg: #fafafa;
  --border: #ccc;
  --link: #0b57d0;
  --focus: #0b57d0;
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    --text: #eee;
    --muted: #aaa;
    --bg: #121212;
    --border: #444;
    --link: #8ab4f8;
    --focus: #8ab4f8;
    color-scheme: dark;
  }
}

html[data-theme="light"] {
  color-scheme: light;
  --text: #1a1a1a;
  --muted: #555;
  --bg: #fafafa;
  --border: #ccc;
  --link: #0b57d0;
  --focus: #0b57d0;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --text: #eee;
  --muted: #aaa;
  --bg: #121212;
  --border: #444;
  --link: #8ab4f8;
  --focus: #8ab4f8;
}

/* Avoid horizontal nudge when toggling theme: classic scrollbar width can change with color-scheme. */
html {
  scrollbar-gutter: stable;
}

/*
 * Brief global color transitions only while the user toggles the theme (see site-theme.js).
 * Avoids a harsh full-page flash for photosensitive users; not applied on first paint.
 */
@media (prefers-reduced-motion: no-preference) {
  :root {
    --theme-crossfade-duration: 420ms;
  }

  html.theme-crossfade-active,
  html.theme-crossfade-active *,
  html.theme-crossfade-active *::before,
  html.theme-crossfade-active *::after {
    transition:
      background-color var(--theme-crossfade-duration) ease-out,
      color var(--theme-crossfade-duration) ease-out,
      border-color var(--theme-crossfade-duration) ease-out,
      outline-color var(--theme-crossfade-duration) ease-out,
      fill var(--theme-crossfade-duration) ease-out,
      stroke var(--theme-crossfade-duration) ease-out,
      box-shadow var(--theme-crossfade-duration) ease-out !important;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, Segoe UI, Roboto, sans-serif;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 0.5rem 1rem;
  background: var(--text);
  color: var(--bg);
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.25rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 56rem;
  margin: 0 auto;
}

.logo {
  font-weight: 700;
  text-decoration: none;
  color: inherit;
}

.logo__img {
  display: block;
  position: relative;
  top: 0.16em;
  height: 1.85rem;
  width: auto;
  max-width: min(11.5rem, 42vw);
  object-fit: contain;
  object-position: left center;
}

.logo__img--dark {
  display: none;
}

html[data-theme="dark"] .logo__img--light {
  display: none;
}

html[data-theme="dark"] .logo__img--dark {
  display: block;
}

.nav-list {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-list a:not(.nav-assignment-cta) {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  text-underline-offset: 0.2em;
  text-decoration-thickness: 2px;
}

.nav-list a:not(.nav-assignment-cta):hover {
  color: color-mix(in srgb, var(--link) 58%, var(--text));
  text-decoration: underline;
}

.nav-list a:not(.nav-assignment-cta):focus-visible {
  color: color-mix(in srgb, var(--link) 62%, var(--text));
  text-decoration: underline;
}

.nav-assignment-cta__text--short {
  display: none;
}

/* Prominent CTA — assignments builder */
.nav-assignment-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.5rem 0.95rem;
  font-weight: 700;
  font-size: 0.82rem;
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: #fff;
  text-decoration: none;
  white-space: nowrap;
  border-radius: 0.55rem;
  background: linear-gradient(165deg, #3d9cff 0%, #0b57d0 42%, #0842a0 100%);
  /* Light edge on the pill — avoids a harsh dark rim on light page backgrounds */
  border: 1px solid rgba(255, 255, 255, 0.32);
  box-shadow:
    0 2px 10px rgba(11, 87, 208, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.22);
  transition: transform 0.12s ease, box-shadow 0.12s ease, filter 0.12s ease;
}

.nav-assignment-cta__plus {
  display: inline-block;
  font-weight: 800;
  font-size: 1em;
  line-height: 1;
  opacity: 0.95;
  /* Plus glyphs often sit low in the box; nudge to match cap height of the label */
  transform: translateY(-0.08em);
}

.nav-assignment-cta:hover {
  color: #fff;
  text-decoration: none;
  filter: brightness(1.08);
  box-shadow:
    0 4px 16px rgba(11, 87, 208, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

.nav-assignment-cta:active {
  transform: translateY(1px);
  filter: brightness(0.98);
  box-shadow:
    0 1px 6px rgba(11, 87, 208, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.nav-assignment-cta:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

html[data-theme="dark"] .nav-assignment-cta {
  background: linear-gradient(165deg, #3d9cff 0%, #0b57d0 42%, #0842a0 100%);
  border-color: rgba(255, 255, 255, 0.32);
  color: #fff;
  box-shadow:
    0 2px 10px rgba(11, 87, 208, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

html[data-theme="dark"] .nav-assignment-cta:hover {
  box-shadow:
    0 4px 16px rgba(11, 87, 208, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

/* Keep this CTA visually stable during theme crossfade. */
html.theme-crossfade-active .nav-assignment-cta,
html.theme-crossfade-active .nav-assignment-cta:hover,
html.theme-crossfade-active .nav-assignment-cta:active {
  transition: none !important;
  filter: none !important;
}

@media (prefers-reduced-motion: reduce) {
  .nav-assignment-cta,
  .nav-assignment-cta:active {
    transition: none;
    transform: none;
  }
}

.theme-toggle-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font: inherit;
  font-size: 0.9rem;
  line-height: 1.2;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  /* Label swaps between “Dark mode” / “Light mode”; reserve width so the nav row doesn’t reflow. */
  min-width: 9.25rem;
}

.theme-toggle-icons {
  display: none;
  align-items: center;
}

.theme-toggle-icon {
  width: 1rem;
  height: 1rem;
  display: block;
  opacity: 0.92;
}

.theme-toggle-icon--sun {
  display: none;
}

html[data-theme="dark"] .theme-toggle-icon--moon {
  display: none;
}

html[data-theme="dark"] .theme-toggle-icon--sun {
  display: block;
  filter: brightness(0) invert(1);
}

.theme-toggle-btn:hover {
  background: color-mix(in srgb, var(--text) 6%, transparent);
}

.theme-toggle-btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* Narrow screens: single-row header with right-aligned theme toggle. */
@media (max-width: 40rem) {
  .site-header {
    padding: 0.65rem 1rem;
  }

  /* space-between balances the three groups (logo / nav-list / toggle) so the
     nav-list sits comfortably in the middle of the bar instead of bunched up
     against the logo on the left. 0.65rem is the *minimum* gap if a viewport
     is too narrow to add extra breathing room. */
  .nav {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.65rem;
  }

  .logo {
    display: inline-flex;
    align-items: center;
    flex-shrink: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .logo__img {
    max-width: min(9.5rem, 46vw);
    height: 1.65rem;
  }

  /* margin-left: auto would override space-between's distribution and pin the
     toggle hard right; let space-between handle alignment instead. */
  .theme-toggle-btn {
    margin-left: 0;
    justify-self: end;
    align-self: center;
  }

  .nav-list {
    width: auto;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.85rem;
    justify-content: flex-start;
    flex-shrink: 0;
  }

  .nav-item--hide-sm {
    display: none;
  }

  .nav-assignment-cta__text--long {
    display: inline;
  }

  .nav-assignment-cta__text--short {
    display: none;
  }

  .nav-assignment-cta {
    padding: 0.4rem 0.62rem;
    font-size: 0.72rem;
    line-height: 1.1;
    white-space: nowrap;
  }

  .theme-toggle-btn {
    padding: 0.3rem 0.62rem;
    font-size: 0.78rem;
    line-height: 1.1;
    min-width: 2.05rem;
    min-height: 2.05rem;
  }

  .theme-toggle-label {
    display: none;
  }

  .theme-toggle-icons {
    display: inline-flex;
  }
}

a {
  color: var(--link);
}

a:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.main {
  max-width: 56rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

/* Wider reading width for homepage + library grids */
.main--home {
  max-width: min(92vw, 80rem);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1rem 1.25rem 1.1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 0.6rem 1.25rem;
  max-width: min(92vw, 80rem);
  margin: 0 auto;
  width: 100%;
}

.site-footer__copy {
  margin: 0;
  text-align: left;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.35rem 1rem;
  font-size: 0.875rem;
  justify-self: end;
}

.site-footer__legal a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 0.12em;
}

.site-footer__legal a:hover {
  color: var(--link);
}

.main--legal {
  max-width: 42rem;
}

.main--legal h1 {
  margin-top: 0;
  font-size: clamp(1.35rem, 3vw, 1.65rem);
}

.main--legal h2 {
  margin: 1.75rem 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 650;
}

.main--legal h2:first-of-type {
  margin-top: 1.25rem;
}

.main--legal p,
.main--legal li {
  line-height: 1.55;
}

.main--legal ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

.main--legal hr {
  margin: 2rem 0;
  border: none;
  border-top: 1px solid var(--border);
}

/* Homepage hero: split image+panel (default) or .home-hero--full-banner flat strip + text */
.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 0;
  margin: 0 0 2.25rem;
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 12px 36px color-mix(in srgb, var(--text) 8%, transparent);
  min-height: 0;
  align-items: start;
}

.home-hero:not(.home-hero--full-banner) .home-hero__visual {
  position: relative;
  z-index: 0;
  min-height: 7rem;
  background: color-mix(in srgb, var(--text) 7%, var(--bg));
}

.home-hero:not(.home-hero--full-banner) .home-hero__img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 7rem;
  max-height: min(14rem, 42vw);
  object-fit: cover;
  object-position: center;
}

/* Text column: one gradient only; overlaps image so transparent edge blends (no hard photo edge). */
.home-hero__panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.65rem;
  padding: clamp(1rem, 2vw, 1.5rem) clamp(1.1rem, 2.8vw, 2rem);
}

.home-hero__lede {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  min-width: 0;
}

.home-hero:not(.home-hero--no-image):not(.home-hero--full-banner) .home-hero__panel {
  position: relative;
  z-index: 1;
  margin-left: clamp(-8.5rem, -26vw, -3rem);
  padding: clamp(1rem, 2vw, 1.5rem) clamp(1.1rem, 2.8vw, 2rem) clamp(1rem, 2vw, 1.5rem)
    clamp(2.75rem, 9vw, 5.5rem);
  background: linear-gradient(
    to right,
    transparent 0%,
    transparent 22%,
    color-mix(in srgb, var(--link) 6%, var(--bg) 94%) 44%,
    color-mix(in srgb, var(--link) 12%, var(--bg) 88%) 62%,
    color-mix(in srgb, var(--link) 16%, var(--bg) 84%) 78%,
    color-mix(in srgb, var(--bg) 90%, var(--text)) 92%,
    var(--bg) 100%
  );
}

/* Full-width banner: one image row; panel overlays title + sub + CTA (desktop) */
.home-hero--full-banner {
  position: relative;
  grid-template-columns: 1fr;
  grid-template-rows: auto;
  align-items: stretch;
}

.home-hero--full-banner .home-hero__visual {
  position: relative;
  z-index: 0;
  grid-column: 1;
  grid-row: 1;
  width: 100%;
  min-height: 0;
  background: transparent;
}

.home-hero--full-banner .home-hero__img {
  display: block;
  width: 100%;
  max-height: none;
  min-height: 0;
  height: auto;
  aspect-ratio: 5 / 1;
  object-fit: cover;
  object-position: center;
}

.home-hero--full-banner .home-hero__panel {
  grid-column: 1;
  grid-row: 1;
  align-self: center;
  justify-self: start;
  z-index: 1;
  width: fit-content;
  max-width: min(26rem, calc(45% - 1.25rem));
  margin: 0 0 0 55%;
  padding: clamp(0.85rem, 2vw, 1.25rem) clamp(1rem, 3vw, 1.75rem);
  background: none;
  box-shadow: none;
}

.home-hero--full-banner .home-hero__sub {
  max-width: none;
}

.home-hero--full-banner .home-hero__heading,
.home-hero--full-banner .home-hero__sub {
  text-shadow: 0 1px 2px color-mix(in srgb, var(--bg) 65%, transparent),
    0 0 1rem color-mix(in srgb, var(--bg) 40%, transparent);
}

/* Full-banner on light theme: title + sub stay readable on the photo (dark-theme colors + halo); CTA still uses light --link / white text. */
html[data-theme="light"] .home-hero--full-banner .home-hero__heading {
  color: #eee;
}

html[data-theme="light"] .home-hero--full-banner .home-hero__sub {
  color: #aaa;
}

html[data-theme="light"] .home-hero--full-banner .home-hero__heading,
html[data-theme="light"] .home-hero--full-banner .home-hero__sub {
  text-shadow: 0 1px 2px color-mix(in srgb, #121212 65%, transparent),
    0 0 1rem color-mix(in srgb, #121212 40%, transparent);
}

.home-hero--no-image .home-hero__panel {
  background: linear-gradient(
    165deg,
    color-mix(in srgb, var(--link) 12%, var(--bg)) 0%,
    color-mix(in srgb, var(--bg) 90%, var(--text)) 48%,
    var(--bg) 100%
  );
}

.home-hero--no-image {
  grid-template-columns: 1fr;
}

.home-hero__panel--solo {
  grid-column: 1 / -1;
}

.home-hero__heading {
  margin: 0;
  font-size: clamp(1.4rem, 2.2vw, 1.85rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.home-hero__sub {
  margin: 0;
  max-width: 40rem;
  font-size: clamp(0.98rem, 1.2vw, 1.08rem);
  line-height: 1.5;
  color: var(--muted);
}

/* Hero CTA group: holds "Browse the library" plus the desktop-only "About Us"
   button side by side. align-self handles desktop alignment; mobile centering
   is taken care of by the panel's align-items rule. */
.home-hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-self: flex-start;
  margin-top: 0.1rem;
}

.home-hero__ctas .home-hero__cta.button {
  margin-top: 0;
}

/* Per-button text variants: desktop shows the longer label, mobile shows the
   compact one so both buttons fit in the right half of the banner. */
.home-hero__cta-text--short {
  display: none;
}

.home-hero__cta.button {
  align-self: flex-start;
  margin-top: 0.1rem;
  padding: 0.5rem 1.15rem;
  font-weight: 600;
  border-radius: 0.5rem;
  border: 1px solid color-mix(in srgb, var(--link) 55%, #0a1628);
  background: var(--link);
  color: #fff;
}

.home-hero__cta.button:hover {
  background: color-mix(in srgb, var(--link) 88%, #000);
  border-color: color-mix(in srgb, var(--link) 40%, #000);
}

.home-hero__cta.button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

/* Hero CTA: same light-theme blue + white in dark mode (only this banner button). */
html[data-theme="dark"] .home-hero__cta.button {
  border: 1px solid color-mix(in srgb, #0b57d0 55%, #0a1628);
  background: #0b57d0;
  color: #fff;
}

html[data-theme="dark"] .home-hero__cta.button:hover {
  background: color-mix(in srgb, #0b57d0 88%, #000);
  border-color: color-mix(in srgb, #0b57d0 40%, #000);
}

@media (max-width: 720px) {
  .home-hero {
    grid-template-columns: 1fr;
    min-height: 0;
  }

  .home-hero:not(.home-hero--full-banner) .home-hero__visual {
    min-height: 6.5rem;
    max-height: 11rem;
  }

  .home-hero:not(.home-hero--full-banner) .home-hero__img {
    max-height: 11rem;
  }

  /* Full-width banner mobile: site title + CTA only, right half of strip (subhead hidden) */
  .home-hero--full-banner .home-hero__visual {
    grid-row: 1;
    grid-column: 1;
    max-height: none;
  }

  .home-hero--full-banner .home-hero__panel {
    position: absolute;
    left: 45%;
    right: 0;
    top: 0;
    bottom: 0;
    grid-column: 1;
    grid-row: 1;
    align-self: stretch;
    justify-self: stretch;
    width: auto;
    max-width: none;
    margin: 0;
    padding: clamp(0.35rem, 2.5vw, 0.55rem) clamp(0.5rem, 2.2vw, 0.7rem);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 0.45rem;
    background: none;
    box-shadow: none;
  }

  .home-hero--full-banner .home-hero__lede {
    align-items: center;
    text-align: center;
    width: fit-content;
    max-width: 100%;
    gap: 0.4rem;
  }

  .home-hero--full-banner .home-hero__sub {
    display: none;
  }

  .home-hero--full-banner .home-hero__heading {
    font-size: clamp(0.88rem, 3.5vw, 1.12rem);
    line-height: 1.15;
    max-width: 100%;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Mobile: swap to the compact button labels so both fit side by side. */
  .home-hero__cta-text--long {
    display: none;
  }

  .home-hero__cta-text--short {
    display: inline;
  }

  .home-hero__ctas {
    gap: 0.4rem;
  }

  .home-hero--full-banner .home-hero__ctas {
    align-self: center;
    margin-top: 0;
    flex-wrap: nowrap;
  }

  .home-hero--full-banner .home-hero__cta.button {
    align-self: center;
    margin-top: 0;
    padding: 0.38rem 0.85rem;
    font-size: 0.82rem;
    font-weight: 600;
  }

  .home-hero:not(.home-hero--no-image):not(.home-hero--full-banner) .home-hero__panel {
    margin-left: 0;
    margin-top: clamp(-3.25rem, -11vw, -1.5rem);
    padding: clamp(2.25rem, 7vw, 3.5rem) clamp(1.1rem, 2.8vw, 2rem) clamp(1rem, 2vw, 1.5rem);
    background: linear-gradient(
      to bottom,
      transparent 0%,
      transparent 18%,
      color-mix(in srgb, var(--link) 6%, var(--bg) 94%) 42%,
      color-mix(in srgb, var(--link) 12%, var(--bg) 88%) 58%,
      color-mix(in srgb, var(--link) 16%, var(--bg) 84%) 74%,
      color-mix(in srgb, var(--bg) 90%, var(--text)) 90%,
      var(--bg) 100%
    );
  }

  .home-hero--no-image .home-hero__panel {
    margin-top: 0;
    padding: clamp(1rem, 2vw, 1.5rem) clamp(1.1rem, 2.8vw, 2rem);
  }

  .home-hero__panel--solo {
    grid-column: auto;
  }
}

.collection {
  margin-top: 2.5rem;
}

.home-rows {
  display: flex;
  flex-direction: column;
  gap: 2.75rem;
  margin-top: 2rem;
}

.home-row__header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  margin-bottom: 1rem;
}

.home-row__title {
  margin: 0;
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.home-row__see-all {
  flex-shrink: 0;
  font-size: 0.9rem;
}

.book-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem 1.25rem;
}

/* Up to 4 columns on large screens; fewer on small */
.book-grid--row {
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 40rem) {
  .book-grid--row {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 64rem) {
  .book-grid--row {
    grid-template-columns: repeat(4, 1fr);
  }
}

.book-grid--library {
  grid-template-columns: repeat(2, 1fr);
  margin-top: 1.5rem;
}

@media (min-width: 36rem) {
  .book-grid--library {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 56rem) {
  .book-grid--library {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 72rem) {
  .book-grid--library {
    grid-template-columns: repeat(5, 1fr);
  }
}

.book-cards {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}

@media (min-width: 30rem) {
  .book-cards {
    grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  }
}

.book-card {
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
  background: color-mix(in srgb, var(--text) 3%, transparent);
}

.book-card--compact .book-card__body {
  padding: 0.65rem 0.85rem 0.85rem;
}

.book-card--compact .book-card__title {
  font-size: 0.95rem;
  line-height: 1.35;
}

.book-card--compact .book-card__author {
  font-size: 0.82rem;
}

.book-card__link {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: inherit;
  text-decoration: none;
}

.book-card__link:hover .book-card__title {
  color: var(--link);
}

.book-card__link:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.book-card__media {
  display: block;
  aspect-ratio: 2 / 3;
  background: var(--border);
}

.book-card__cover {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-card__body {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem 1rem 1rem;
}

.book-card__title {
  font-weight: 600;
}

.book-card__author {
  font-size: 0.9rem;
  color: var(--muted);
}

.book-card__desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-hub {
  width: 100%;
}

.book-hub__header {
  --book-hub-header-gutter: 1.5rem;
  /* ~10rem + enough extra width (~2:3 height) so art ends about one gutter below the button, same as cover–title horizontal space. */
  --book-hub-cover-width: 11.125rem;
  display: grid;
  grid-template-columns: minmax(0, var(--book-hub-cover-width)) minmax(0, 1fr);
  gap: 1.25rem var(--book-hub-header-gutter);
  align-items: start;
  margin-bottom: 1rem;
}

@media (max-width: 36rem) {
  .book-hub__header {
    grid-template-columns: 1fr;
  }

  .book-hub__cover-wrap {
    justify-self: center;
  }

  .book-hub__intro {
    text-align: center;
  }

  .book-hub__start {
    text-align: center;
  }
}

.book-hub__cover-wrap {
  margin: 0;
}

.book-hub__cover {
  display: block;
  width: var(--book-hub-cover-width);
  max-width: 100%;
  height: auto;
  border-radius: 0.35rem;
  border: 1px solid var(--border);
}

.book-hub__intro {
  min-width: 0;
}

.book-hub__intro h1 {
  margin: 0 0 0.2rem;
  line-height: 1.2;
}

.book-hub__intro .byline {
  margin-top: 0;
}

.book-hub__intro .deck {
  margin: 0.65rem 0 0;
  line-height: 1.55;
}

.book-hub__stats {
  margin: 0.85rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.book-hub__start {
  margin: 1.3rem 0 0;
}

.book-hub__start .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.65rem;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.2;
  border-radius: 0.625rem;
  border: 1px solid color-mix(in srgb, var(--link) 70%, #000);
  background: var(--link);
  color: #fff;
  text-decoration: none;
  box-shadow:
    0 2px 4px color-mix(in srgb, var(--text) 12%, transparent),
    inset 0 1px 0 color-mix(in srgb, #fff 22%, transparent);
  transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease,
    transform 0.08s ease;
}

.book-hub__start .button:hover {
  background: color-mix(in srgb, var(--link) 78%, #000);
  border-color: color-mix(in srgb, var(--link) 52%, #000);
  box-shadow:
    0 3px 10px color-mix(in srgb, var(--text) 18%, transparent),
    inset 0 1px 0 color-mix(in srgb, #fff 20%, transparent);
}

.book-hub__start .button:active {
  transform: translateY(1px);
  background: color-mix(in srgb, var(--link) 68%, #000);
  border-color: color-mix(in srgb, var(--link) 42%, #000);
  box-shadow:
    0 1px 3px color-mix(in srgb, var(--text) 14%, transparent),
    inset 0 1px 0 color-mix(in srgb, #fff 14%, transparent);
}

.book-hub__start .button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

html[data-theme="dark"] .book-hub__start .button {
  color: #0f1419;
  border-color: color-mix(in srgb, var(--link) 45%, #0a1628);
  box-shadow:
    0 2px 8px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 color-mix(in srgb, #fff 40%, transparent);
}

html[data-theme="dark"] .book-hub__start .button:hover {
  background: color-mix(in srgb, var(--link) 86%, #fff);
  border-color: color-mix(in srgb, var(--link) 58%, #fff);
  box-shadow:
    0 3px 12px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 color-mix(in srgb, #fff 55%, transparent);
}

html[data-theme="dark"] .book-hub__start .button:active {
  background: color-mix(in srgb, var(--link) 78%, #fff);
  border-color: color-mix(in srgb, var(--link) 48%, #e8e8e8);
}

.book-hub__usage-note {
  margin: 0.5rem 0 0;
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--muted);
  opacity: 0.85;
}

.book-hub__teacher-tip {
  --tip-bg: #ecf5ee;
  --tip-border: #c8dfce;
  --tip-accent: #2f7a55;
  --tip-text: #1f4a36;
  --tip-link-hover: #1a5c3f;
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  margin: 1.1rem 0 0;
  padding: 0.9rem 1.1rem;
  background: var(--tip-bg);
  border: 1px solid var(--tip-border);
  border-left: 4px solid var(--tip-accent);
  border-radius: 8px;
  color: var(--tip-text);
  font-size: 0.92rem;
  line-height: 1.5;
}

.book-hub__teacher-tip__icon {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.1rem;
  color: var(--tip-accent);
}

.book-hub__teacher-tip__body {
  flex: 1 1 auto;
  min-width: 0;
}

.book-hub__teacher-tip__heading {
  margin: 0 0 0.2rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--tip-accent);
}

.book-hub__teacher-tip__text {
  margin: 0;
  color: inherit;
}

.book-hub__teacher-tip a {
  color: var(--tip-accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.book-hub__teacher-tip a:hover,
.book-hub__teacher-tip a:focus-visible {
  color: var(--tip-link-hover);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) .book-hub__teacher-tip {
    --tip-bg: #1c2a22;
    --tip-border: #3a5a48;
    --tip-accent: #8fd1a8;
    --tip-text: #d4ead9;
    --tip-link-hover: #b8e8c8;
  }
}

html[data-theme="dark"] .book-hub__teacher-tip {
  --tip-bg: #1c2a22;
  --tip-border: #3a5a48;
  --tip-accent: #8fd1a8;
  --tip-text: #d4ead9;
  --tip-link-hover: #b8e8c8;
}

.book-hub-toc {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.book-hub-toc__title {
  margin: 0 0 0.85rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.book-hub-toc__nav {
  font-size: 0.95rem;
}

.breadcrumb {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

/* Back link: icon + label, sits above breadcrumb on hub/author pages. */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0 0.6rem;
  padding: 0.3rem 0.65rem 0.3rem 0.5rem;
  font-size: 0.88rem;
  font-weight: 500;
  line-height: 1.2;
  color: var(--text);
  text-decoration: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: background-color 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.back-link:hover {
  color: color-mix(in srgb, var(--link) 58%, var(--text));
  background: color-mix(in srgb, var(--text) 6%, transparent);
  border-color: color-mix(in srgb, var(--link) 35%, var(--border));
}

.back-link:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.back-link__icon {
  display: inline-block;
  width: 0.95em;
  height: 0.95em;
  background: currentColor;
  -webkit-mask: url("/assets/icons/ui/back.svg") center / contain no-repeat;
          mask: url("/assets/icons/ui/back.svg") center / contain no-repeat;
  flex-shrink: 0;
}

.book-page-body {
  margin: 1.25rem 0;
  font-family: "Merriweather", Georgia, "Times New Roman", Times, serif;
  line-height: 1.78;
  font-size: clamp(1.02rem, 0.99rem + 0.12vw, 1.1rem);
}

/* Plays: JSON uses newlines inside HTML; novels omit this class */
.book-text--preline {
  white-space: pre-line;
}

/* Prose: two <br> per \n\n; margin between them adds an extra blank line */
.book-text--prose-flow br.book-prose-parabreak {
  display: block;
  margin: 0;
}

.book-text--prose-flow br.book-prose-parabreak + br.book-prose-parabreak {
  margin-top: 0.9em;
}

/* Prose (opt-in): real <p> paragraphs generated from page-start + \n\n separators. */
.book-text--prose-paragraphs p {
  margin: 0;
}

.book-text--prose-paragraphs p + p {
  margin-top: 0.9em;
}

.byline {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.byline a {
  color: var(--link);
  text-decoration: none;
}

.byline a:hover {
  text-decoration: underline;
}

.author-page {
  margin-bottom: 2rem;
}

.author-page__header {
  margin-bottom: 1rem;
}

.author-page__bio {
  max-width: 40rem;
  margin: 0 0 1.25rem;
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--text);
}

.author-page__works-count {
  margin: 0 0 1.25rem;
  max-width: 40rem;
  font-size: 1rem;
  line-height: 1.45;
  color: var(--muted);
}

.ad-slot {
  margin: 2rem 0;
  padding: 2rem;
  border: 1px dashed var(--border);
  border-radius: 0.5rem;
  text-align: center;
  color: var(--muted);
}

.ad-placeholder {
  margin: 0;
  font-size: 0.85rem;
}

.pager {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.button {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  border: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  font-weight: 500;
}

.button:hover {
  background: color-mix(in srgb, var(--text) 6%, transparent);
}

.button--ghost {
  background: transparent;
  border-color: var(--border);
}

.button--ghost:hover {
  border-color: var(--muted);
}

.library-page-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  margin-bottom: 0.5rem;
}

.library-page-header {
  flex: 1 1 16rem;
  min-width: 0;
  margin-bottom: 0;
}

.library-page-header h1 {
  margin: 0 0 0.35rem;
}

.library-page-lead {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  max-width: 40rem;
}

.library-toolbar__actions {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.55rem;
  flex: 1 1 18rem;
  min-width: 0;
}

@media (min-width: 43rem) {
  .library-toolbar__actions {
    align-items: flex-end;
  }
}

.library-search {
  width: min(100%, 26rem);
  max-width: 26rem;
  min-width: 0;
}

.library-filters {
  width: min(100%, 26rem);
  max-width: 26rem;
  min-width: 0;
}

.library-filters__panel {
  position: static;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 0.75rem;
  align-items: center;
  justify-content: flex-start;
  padding: 0.1rem 0 0;
}

.library-filters__option {
  display: flex;
  align-items: center;
  gap: 0.42rem;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg) 94%, var(--text));
  cursor: pointer;
  font-size: 0.88rem;
}

.library-filters__option input {
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  accent-color: var(--text);
}

.library-filters__option-text {
  line-height: 1.3;
}

@media (max-width: 42rem) {
  .library-filters__panel {
    gap: 0.45rem 0.5rem;
  }

  .library-filters__option {
    font-size: 0.84rem;
    padding: 0.3rem 0.5rem;
  }
}

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

.library-search__input {
  box-sizing: border-box;
  width: 100%;
  height: 2.5rem;
  padding: 0 0.75rem;
  font: inherit;
  font-size: 0.95rem;
  line-height: 1.2;
  color: var(--text);
  background: var(--surface, var(--bg));
  border: 1px solid var(--border);
  border-radius: 0.375rem;
}

.library-search__input::placeholder {
  color: var(--muted);
}

.library-search__input:focus {
  outline: 2px solid color-mix(in srgb, var(--text) 35%, transparent);
  outline-offset: 2px;
}

.library-search-empty {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.library-search-empty[hidden] {
  display: none;
}

.post-list {
  list-style: none;
  padding: 0;
}

.post-list li {
  margin-bottom: 0.75rem;
}

.post-list time {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Assignment builder (/assignments/) */
.assignment-params {
  margin-top: 1.25rem;
}

.assignment-params--disabled {
  opacity: 0.52;
}

.assignment-builder {
  max-width: 40rem;
}

.assignment-builder-header .lead {
  color: var(--muted);
  font-size: 1.05rem;
}

.assignment-field {
  margin-top: 1.25rem;
}

.assignment-mode-switch {
  margin-top: 0.5rem;
}

.assignment-mode-switch__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.assignment-mode-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.4rem;
  padding: 0.55rem 0.95rem;
  border: 1px solid color-mix(in srgb, var(--text) 22%, var(--border));
  border-radius: 0.5rem;
  background: color-mix(in srgb, var(--bg) 82%, var(--text));
  box-shadow: 0 1px 2px color-mix(in srgb, var(--text) 14%, transparent);
  font-weight: 600;
  transition: background-color 120ms ease, border-color 120ms ease, box-shadow 120ms ease,
    transform 120ms ease;
}

.assignment-mode-btn:hover {
  background: color-mix(in srgb, var(--bg) 72%, var(--text));
  border-color: color-mix(in srgb, var(--text) 40%, var(--border));
  box-shadow: 0 2px 6px color-mix(in srgb, var(--text) 16%, transparent);
}

.assignment-mode-btn--active {
  background: color-mix(in srgb, var(--text) 16%, transparent);
  border-color: var(--text);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--text) 45%, transparent);
}

.assignment-mode-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

.assignment-field--row {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr 1fr;
}

/* Ensure hidden assignment sections are fully removed from layout. */
#assign-page-fields[hidden],
#assign-page-range-row[hidden],
#assign-word-bounds-wrap[hidden],
#assign-word-fields[hidden],
#assign-word-hint[hidden],
#assign-preset-wrap[hidden],
#assign-output-wrap[hidden],
#assign-preset-controls-range[hidden],
#assign-preset-controls-single[hidden] {
  display: none !important;
}

@media (max-width: 30rem) {
  .assignment-field--row {
    grid-template-columns: 1fr;
  }
}

.assignment-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
}

/* Same color/size as `.assignment-label`; class kept for markup hooks. Smaller sub-captions used to read “lighter.” */
.assignment-label--sub {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.35rem;
  color: inherit;
}

.assignment-preset-mode {
  display: inline-flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.5rem;
}

.assignment-preset-mode__opt {
  display: inline-flex;
  gap: 0.4rem;
  align-items: center;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  user-select: none;
  font-size: 0.9rem;
  background: color-mix(in srgb, var(--bg) 92%, var(--text));
}

.assignment-preset-mode__opt input {
  margin: 0;
}

.assignment-preset-controls {
  margin-bottom: 0.4rem;
}

.assignment-input,
.assignment-select {
  width: 100%;
  max-width: 100%;
  padding: 0.5rem 0.65rem;
  font: inherit;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--bg);
  color: var(--text);
}

.assignment-books-search-hint {
  margin: 0.45rem 0 0;
  font-size: 0.9rem;
}

.assignment-book-list {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  max-height: 14rem;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: color-mix(in srgb, var(--bg) 96%, var(--text));
}

.assignment-book-list[hidden] {
  display: none;
}

.assignment-book-item {
  border-bottom: 1px solid var(--border);
}

.assignment-book-item:last-child {
  border-bottom: none;
}

.assignment-book-item--empty {
  padding: 0.75rem 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.assignment-book-pick {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.65rem 1rem;
  font: inherit;
  color: inherit;
  background: transparent;
  border: none;
  cursor: pointer;
}

.assignment-book-pick:hover {
  background: color-mix(in srgb, var(--text) 6%, transparent);
}

.assignment-book-author {
  color: var(--muted);
  font-weight: 400;
}

.assignment-output-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: stretch;
}

.assignment-output-url {
  flex: 1 1 12rem;
  min-width: 0;
  font-size: 0.85rem;
}

.assignment-copy-btn {
  flex: 0 0 auto;
  align-self: stretch;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  padding: 0.55rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.32);
  background: linear-gradient(165deg, #3d9cff 0%, #0b57d0 42%, #0842a0 100%);
  color: #fff;
  cursor: pointer;
  box-shadow:
    0 2px 10px rgba(11, 87, 208, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.22);
  transition: transform 70ms ease, box-shadow 70ms ease, background-color 120ms ease, border-color 120ms ease,
    filter 120ms ease;
}

.assignment-copy-btn:hover {
  background: linear-gradient(165deg, #3d9cff 0%, #0b57d0 42%, #0842a0 100%);
  color: #fff;
  filter: brightness(1.08);
  box-shadow:
    0 4px 16px rgba(11, 87, 208, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

.assignment-copy-btn:active {
  background: linear-gradient(165deg, #3d9cff 0%, #0b57d0 42%, #0842a0 100%);
  color: #fff;
  transform: translateY(2px);
  box-shadow:
    0 1px 6px rgba(11, 87, 208, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.15);
  filter: brightness(0.96);
}

.assignment-copy-btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.assignment-hint {
  margin: 0.35rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
  min-height: 1.25em;
}

#assign-output-wrap {
  position: relative;
  padding-bottom: 1.35rem;
}

#assign-copy-status {
  position: absolute;
  left: 0;
  bottom: 0;
  margin: 0;
}

html[data-theme="dark"] .assignment-copy-btn {
  background: linear-gradient(165deg, #5cb0ff 0%, #2b7fff 45%, #1557d0 100%);
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow:
    0 2px 14px rgba(0, 40, 120, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

html[data-theme="dark"] .assignment-copy-btn:hover {
  background: linear-gradient(165deg, #5cb0ff 0%, #2b7fff 45%, #1557d0 100%);
  box-shadow:
    0 4px 20px rgba(0, 60, 160, 0.6),
    inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.assignment-word-field {
  min-width: 0;
}

.assignment-word-input-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: stretch;
}

.assignment-word-input-row .assignment-input {
  flex: 1 1 8rem;
  min-width: 0;
  width: auto;
}

.assignment-word-input-row .assignment-word-selected-display {
  flex: 1 1 8rem;
  min-width: 0;
  width: auto;
}

.assignment-word-selected-display {
  box-sizing: border-box;
  min-height: 2.45rem;
  padding: 0.5rem 0.65rem;
  font: inherit;
  font-size: 0.95rem;
  line-height: 1.35;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--bg);
  color: var(--text);
  user-select: none;
  -webkit-user-select: none;
  display: flex;
  align-items: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
}

.assignment-word-selected-display.is-empty {
  color: var(--muted);
  font-style: italic;
}

.assignment-word-selected-display:focus {
  outline: none;
}

.assignment-word-selected-display:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.assignment-word-input-row .assignment-select {
  flex: 1 1 10rem;
  min-width: 0;
  width: auto;
}

/* Page range: one full-width row per field so long “To page” options aren’t clipped */
#assign-page-range-row.assignment-field--row {
  grid-template-columns: 1fr;
}

#assign-page-range-row > div {
  min-width: 0;
}

#assign-page-range-row .assignment-word-input-row {
  flex-wrap: nowrap;
  align-items: center;
  min-width: 0;
  width: 100%;
}

#assign-page-from.assignment-select,
#assign-page-to.assignment-select {
  min-height: 2.45rem;
  font-size: 0.9rem;
  line-height: 1.35;
  padding: 0.5rem 0.65rem;
  flex: 1 1 0;
  min-width: 0;
  width: auto;
  max-width: 100%;
}

/* Slightly smaller type on To page so “None (Single Page Only)” fits in the closed control on narrow viewports */
#assign-page-to.assignment-select {
  font-size: 0.86rem;
}

.assignment-word-pick-btn {
  flex: 0 0 auto;
  white-space: nowrap;
  font-size: 0.9rem;
  padding: 0.45rem 0.75rem;
}

#assign-page-range-row .assignment-word-pick-btn {
  align-self: stretch;
  display: inline-flex;
  align-items: center;
  min-height: 2.45rem;
}

/* Modal: pick timed word on real page (assignments/word-picker.js) */
.assignment-word-picker-dialog {
  max-width: min(42rem, 94vw);
  width: 100%;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg);
  color: var(--text);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
}

.assignment-word-picker-dialog::backdrop {
  background: rgba(0, 0, 0, 0.45);
}

.assignment-word-picker-panel {
  display: flex;
  flex-direction: column;
  max-height: min(85vh, 900px);
}

.assignment-word-picker-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1rem 0.5rem;
  border-bottom: 1px solid var(--border);
}

.assignment-word-picker-title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
}

.assignment-word-picker-hint {
  margin: 0;
  padding: 0.5rem 1rem 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.assignment-word-picker-status {
  margin: 0;
  padding: 0.35rem 1rem 0;
  font-size: 0.85rem;
  min-height: 1.25em;
  color: var(--muted);
}

.assignment-word-picker-scroll {
  flex: 1;
  min-height: 12rem;
  max-height: 55vh;
  overflow: auto;
  padding: 0.75rem 1rem 1rem;
}

.assignment-word-picker-scroll .book-page-body {
  margin: 0;
  font-family: "Merriweather", Georgia, "Times New Roman", Times, serif;
  line-height: 1.78;
  font-size: clamp(1.02rem, 0.99rem + 0.12vw, 1.1rem);
}

.assignment-word-picker-scroll .book-text--preline {
  white-space: pre-line;
}

.assignment-word-picker-scroll .reader-word {
  cursor: pointer;
  border-radius: 0.15em;
}

.assignment-word-picker-scroll .reader-word:hover {
  background: color-mix(in srgb, var(--link) 18%, transparent);
  outline: 1px solid color-mix(in srgb, var(--link) 35%, transparent);
}

.assignment-word-picker-footer {
  padding: 0.75rem 1rem 1rem;
  border-top: 1px solid var(--border);
}

/* Page browser modal (assignments/page-picker.js) */
.assignment-page-picker-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.35rem 0.5rem;
  padding: 0.35rem 0.65rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 92%, var(--text));
}

.assignment-page-picker-prev,
.assignment-page-picker-next {
  flex: 0 0 auto;
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 2.4rem;
  padding: 0.5rem 0.95rem;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
  cursor: pointer;
  touch-action: manipulation;
  color: var(--bg);
  background: var(--text);
  border: 1px solid color-mix(in srgb, var(--text) 72%, var(--border));
  border-radius: 0.5rem;
  box-shadow:
    0 1px 2px color-mix(in srgb, var(--text) 16%, transparent),
    inset 0 1px 0 color-mix(in srgb, var(--bg) 18%, transparent);
  transition:
    background-color 0.12s ease,
    border-color 0.12s ease,
    color 0.12s ease,
    box-shadow 0.12s ease,
    transform 0.08s ease;
}

.assignment-page-picker-prev:hover:not(:disabled),
.assignment-page-picker-next:hover:not(:disabled) {
  background: color-mix(in srgb, var(--text) 86%, var(--link));
  border-color: color-mix(in srgb, var(--text) 58%, var(--link));
  box-shadow:
    0 2px 6px color-mix(in srgb, var(--text) 20%, transparent),
    inset 0 1px 0 color-mix(in srgb, var(--bg) 22%, transparent);
}

.assignment-page-picker-prev:active:not(:disabled),
.assignment-page-picker-next:active:not(:disabled) {
  transform: translateY(1px);
  background: color-mix(in srgb, var(--text) 72%, #000);
  border-color: color-mix(in srgb, var(--text) 65%, #000);
  box-shadow:
    0 0 1px color-mix(in srgb, var(--text) 22%, transparent),
    inset 0 1px 3px color-mix(in srgb, #000 28%, transparent);
}

.assignment-page-picker-prev:focus-visible,
.assignment-page-picker-next:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.assignment-page-picker-prev:disabled,
.assignment-page-picker-next:disabled {
  opacity: 0.48;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

html[data-theme="dark"] .assignment-page-picker-prev,
html[data-theme="dark"] .assignment-page-picker-next {
  color: #0f1419;
  border-color: color-mix(in srgb, var(--text) 42%, #0a1628);
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 color-mix(in srgb, #fff 35%, transparent);
}

html[data-theme="dark"] .assignment-page-picker-prev:hover:not(:disabled),
html[data-theme="dark"] .assignment-page-picker-next:hover:not(:disabled) {
  background: color-mix(in srgb, var(--text) 88%, var(--link));
  border-color: color-mix(in srgb, var(--link) 55%, #fff);
  box-shadow:
    0 2px 8px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 color-mix(in srgb, #fff 45%, transparent);
}

html[data-theme="dark"] .assignment-page-picker-prev:active:not(:disabled),
html[data-theme="dark"] .assignment-page-picker-next:active:not(:disabled) {
  background: color-mix(in srgb, var(--text) 78%, #000);
  border-color: color-mix(in srgb, var(--text) 50%, #000);
}

.assignment-page-picker-nav-cluster {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  flex: 1 1 11rem;
  min-width: 0;
}

.assignment-page-picker-nav-label {
  display: block;
  text-align: center;
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.25;
  min-width: 0;
  max-width: 100%;
}

.assignment-page-picker-jump-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.3rem 0.4rem;
}

.assignment-page-picker-jump-label {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.assignment-page-picker-jump-input {
  width: 4.25rem;
  min-width: 0;
  padding: 0.35rem 0.45rem;
  font-size: 0.9rem;
}

.assignment-page-picker-jump-go {
  flex: 0 0 auto;
  font-size: 0.85rem;
  padding: 0.35rem 0.65rem;
}

@media (min-width: 34rem) {
  .assignment-page-picker-nav-cluster {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.3rem 0.55rem;
  }
}

.assignment-page-picker-dialog .assignment-word-picker-scroll {
  max-height: min(62vh, 720px);
}

.assignment-page-picker-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.assignment-page-picker-use {
  font-weight: 600;
}

.assignment-page-picker-dialog .assignment-word-picker-scroll .reader-word {
  cursor: default;
}

.assignment-page-picker-dialog .assignment-word-picker-scroll .reader-word:hover {
  background: transparent;
  outline: none;
}