:root {
  --sdl-ink: #243126;
  --sdl-muted: #687268;
  --sdl-accent: #72552d;
  --sdl-accent-dark: #4f391c;
  --sdl-paper: #fffdf7;
  --sdl-line: #e2dac9;
}

.sdl-book-entry,
.sdl-reader-layout {
  color: var(--sdl-ink);
  font-family: "Noto Naskh Arabic", "Amiri", Tahoma, serif;
}

.sdl-reader-layout {
  display: grid;
  grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: start;
}

.sdl-reader-layout > aside {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  padding: 1rem;
  border: 1px solid var(--sdl-line);
  border-radius: 14px;
  background: var(--sdl-paper);
}

.sdl-book-back {
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--sdl-accent-dark);
  font-weight: 700;
}

.sdl-toc {
  margin-block: 1.25rem;
}

.sdl-toc h2,
.sdl-search label {
  display: block;
  margin: 0 0 .65rem;
  font-size: 1.05rem;
  font-weight: 800;
}

.sdl-toc ol {
  margin: 0;
  padding-inline-start: 1.4rem;
}

.sdl-toc li {
  margin-block: .42rem;
}

.sdl-toc a {
  color: var(--sdl-ink);
  text-decoration: none;
}

.sdl-toc a:hover,
.sdl-toc a.is-current {
  color: var(--sdl-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.sdl-search-row {
  display: flex;
  gap: .5rem;
}

.sdl-search-row input {
  min-width: 0;
  flex: 1;
  padding: .72rem .85rem;
  border: 1px solid var(--sdl-line);
  border-radius: 9px;
  background: white;
}

.sdl-search-row button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .72rem 1rem;
  border: 1px solid var(--sdl-accent);
  border-radius: 9px;
  background: var(--sdl-accent);
  color: white;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.sdl-search-results {
  margin-top: .75rem;
}

.sdl-search-results ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.sdl-search-results li {
  padding: .7rem 0;
  border-bottom: 1px solid var(--sdl-line);
}

.sdl-search-results a {
  display: block;
  font-weight: 800;
}

.sdl-search-results p {
  margin: .2rem 0 0;
  color: var(--sdl-muted);
  font-size: .92rem;
}

.sdl-chapter-body {
  min-width: 0;
  padding: clamp(1rem, 4vw, 3rem);
  border: 1px solid var(--sdl-line);
  border-radius: 16px;
  background: var(--sdl-paper);
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  line-height: 2;
}

.sdl-chapter-body p {
  margin: 0 0 1em;
}

.sdl-chapter-body .align-center { text-align: center; }
.sdl-chapter-body .align-right { text-align: right; }
.sdl-chapter-body .align-justify { text-align: justify; }

.sdl-print-page {
  display: block;
  width: max-content;
  margin: 2rem auto 1rem;
  padding: .1rem .65rem;
  border: 1px solid var(--sdl-line);
  border-radius: 999px;
  color: var(--sdl-muted);
  background: white;
  font-family: Tahoma, sans-serif;
  font-size: .72em;
  line-height: 1.7;
}

.sdl-chapter-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--sdl-line);
}

.sdl-chapter-nav a:last-child { text-align: left; }

.sdl-empty {
  color: var(--sdl-muted);
}

@media (max-width: 800px) {
  .sdl-reader-layout {
    grid-template-columns: 1fr;
  }

  .sdl-reader-layout > aside {
    position: static;
    max-height: none;
  }

  .sdl-chapter-body {
    padding: 1rem;
    line-height: 1.9;
  }

  .sdl-search-row {
    flex-direction: column;
  }

  .sdl-chapter-nav {
    grid-template-columns: 1fr;
  }

  .sdl-chapter-nav a:last-child { text-align: right; }
}