:root {
  color-scheme: light;
  --bg: #fbfaf7;
  --surface: #fffdf8;
  --surface-soft: #f3eee5;
  --text: #27231e;
  --muted: #6f665b;
  --faint: #94887a;
  --border: #ded4c4;
  --accent: #a77a2a;
  --accent-strong: #7a561a;
  --shadow: 0 24px 70px rgba(54, 41, 22, 0.11);
  --header-height: 72px;
  --reader-width: 760px;
  --nav-width: 300px;
  --reader-font-scale: 1.08;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #14120f;
  --surface: #1e1a16;
  --surface-soft: #28231d;
  --text: #efe8dc;
  --muted: #b9ad9d;
  --faint: #8f8374;
  --border: #3b332a;
  --accent: #d0a75a;
  --accent-strong: #e3c47d;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(167, 122, 42, 0.08), transparent 32rem),
    var(--bg);
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.7;
}

a {
  color: var(--accent-strong);
}

button {
  font: inherit;
}

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

.skip-link {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 20;
  transform: translateY(-160%);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header-height);
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 0 1.2rem;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(18px);
}

.brand {
  min-width: 0;
  display: flex;
  align-items: center;
}

.brand-logo {
  display: block;
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.brand-mark {
  margin: 0;
  font-size: 1.12rem;
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.nav-label,
.small-note {
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.icon-button,
.control-button,
.back-to-top {
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface);
  box-shadow: none;
  cursor: pointer;
}

.icon-button,
.back-to-top {
  width: 42px;
  height: 42px;
  border-radius: 50%;
}

.nav-toggle {
  position: relative;
}

.nav-toggle span[aria-hidden="true"],
.nav-toggle::before,
.nav-toggle::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  height: 1px;
  background: currentColor;
}

.nav-toggle::before {
  top: 14px;
}

.nav-toggle span[aria-hidden="true"] {
  top: 20px;
}

.nav-toggle::after {
  top: 26px;
}

.reader-controls {
  display: inline-flex;
  align-items: center;
  justify-content: end;
  gap: 0.45rem;
}

.text-controls,
.language-switcher {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.control-button {
  min-width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  border-radius: 999px;
  padding: 0 0.62rem;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.82rem;
}

.control-button:hover,
.control-button.is-active {
  border-color: color-mix(in srgb, var(--accent) 65%, var(--border));
  color: var(--accent-strong);
}

.control-button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.lang-button {
  font-size: 1.05rem;
  padding: 0 0.5rem;
}

.theme-toggle {
  font-size: 1rem;
  padding: 0;
}

.layout {
  display: grid;
  grid-template-columns: var(--nav-width) minmax(0, 1fr);
  min-height: calc(100vh - var(--header-height));
  transition: grid-template-columns 180ms ease;
}

.layout.is-nav-collapsed {
  grid-template-columns: 0 minmax(0, 1fr);
}

.chapter-nav {
  position: sticky;
  top: var(--header-height);
  width: var(--nav-width);
  height: calc(100vh - var(--header-height));
  border-right: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 92%, var(--surface));
  overflow: auto;
  transition: transform 180ms ease, border-color 180ms ease;
}

.layout.is-nav-collapsed .chapter-nav {
  transform: translateX(-100%);
  border-color: transparent;
  pointer-events: none;
}

.chapter-nav__inner {
  padding: 1.25rem;
}

.nav-label {
  margin: 0 0 0.65rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.chapter-nav nav {
  display: grid;
  gap: 0.25rem;
}

.chapter-nav a,
.chapter-nav span {
  display: block;
  border-radius: 8px;
  padding: 0.45rem 0.6rem;
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.9rem;
  line-height: 1.35;
  text-decoration: none;
}

.chapter-nav a:hover,
.chapter-nav a.is-active {
  background: var(--surface-soft);
  color: var(--text);
  box-shadow: inset 2px 0 0 var(--accent);
}

.chapter-nav .is-upcoming {
  color: var(--faint);
}

.nav-item.level-0 {
  margin-bottom: 0.7rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--border);
}

.nav-item.level-1 {
  margin-top: 0.25rem;
}

.nav-item.level-1 > a,
.nav-item.level-1 > span {
  color: var(--text);
}

.nav-children {
  margin: 0.12rem 0 0.45rem 0.7rem;
  padding-left: 0.65rem;
  border-left: 1px solid var(--border);
}

.nav-children a,
.nav-children span {
  font-size: 0.84rem;
}

.reader {
  width: min(100%, calc(var(--reader-width) + 4rem));
  margin: 0 auto;
  padding: 2.6rem 2rem 6rem;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 500;
  line-height: 1.15;
}

.small-note {
  font-size: 0.9rem;
}

.reading-progress {
  position: fixed;
  left: 0;
  top: var(--header-height);
  z-index: 9;
  width: 100%;
  height: 2px;
  background: transparent;
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--accent);
}

.chapter {
  scroll-margin-top: calc(var(--header-height) + 1.5rem);
  margin: 0 0 5rem;
  padding-top: 1rem;
}

.chapter + .chapter {
  border-top: 1px solid var(--border);
  padding-top: 4rem;
}

.chapter h2 {
  font-size: clamp(2.25rem, 7.6vw, 4.45rem);
}

.chapter h2 span {
  display: inline-block;
  color: var(--accent);
  font-size: 1em;
  vertical-align: baseline;
}

.chapter-subtitle {
  margin: 0.7rem 0 0;
  color: var(--accent-strong);
  font-size: 1.3rem;
  font-style: italic;
}

.chapter-pager {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  margin: 1.6rem 0 2.2rem;
}

.chapter-pager.bottom {
  margin-top: 2.8rem;
}

.chapter-nav-button {
  max-width: 48%;
  min-width: min(100%, 12rem);
  display: grid;
  gap: 0.18rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.72rem 0.9rem;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.chapter-nav-button:last-child {
  margin-left: auto;
}

.chapter-nav-button:hover {
  border-color: color-mix(in srgb, var(--accent) 70%, var(--border));
  background: var(--surface-soft);
}

.chapter-nav-button span {
  color: var(--muted);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.74rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.chapter-nav-button strong {
  font-size: 0.98rem;
  font-weight: 500;
}

.chapter-section {
  margin-top: 2.2rem;
}

.chapter-section h3 {
  margin-bottom: 1rem;
  color: var(--accent-strong);
  font-size: clamp(1.45rem, 4vw, 2rem);
}

.chapter-section p {
  margin: 0 0 1.1rem;
  font-size: calc(1rem * var(--reader-font-scale));
  line-height: 1.76;
  text-align: justify;
  text-wrap: pretty;
  hyphens: auto;
  overflow-wrap: break-word;
}

.chapter-section p.hebrew-text {
  direction: rtl;
  text-align: right;
}

.chapter-section p:first-of-type::first-letter {
  padding-left: 0.01em;
}

.back-to-top {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  z-index: 11;
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.5rem);
  transition: opacity 160ms ease, transform 160ms ease;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (max-width: 860px) {
  :root {
    --header-height: 66px;
  }

  .site-header {
    grid-template-columns: 42px 1fr auto;
    padding: 0 0.85rem;
    gap: 0.7rem;
  }

  .brand-logo {
    width: 42px;
    height: 42px;
  }

  .reader-controls {
    gap: 0.28rem;
  }

  .control-button {
    min-width: 33px;
    height: 34px;
    padding: 0 0.38rem;
    font-size: 0.76rem;
  }

  .lang-button,
  .theme-toggle {
    font-size: 0.92rem;
  }

  .layout {
    display: block;
  }

  .layout.is-nav-collapsed {
    display: block;
  }

  .chapter-nav {
    position: fixed;
    inset: var(--header-height) auto 0 0;
    z-index: 12;
    width: min(86vw, 330px);
    height: auto;
    transform: translateX(-105%);
    transition: transform 180ms ease;
    box-shadow: var(--shadow);
    pointer-events: auto;
  }

  .chapter-nav.is-open,
  .layout.is-nav-collapsed .chapter-nav.is-open {
    transform: translateX(0);
  }

  .reader {
    padding: 1.7rem 1.15rem 5.2rem;
  }

  .chapter-pager {
    flex-direction: column;
  }

  .chapter-nav-button {
    max-width: none;
    width: 100%;
  }
}

@media (min-width: 861px) {
  .layout.is-nav-collapsed .reader {
    width: min(100%, calc(var(--reader-width) + 4rem));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}