:root {
  --font-scale: 1;
  --bg: #f6f0e2;
  --surface: #fffaf0;
  --text: #2a2017;
  --muted: #76664f;
  --accent: #8a5a2b;
  --accent-text: #fffaf0;
  --border: #e2d4b8;
  --shadow: 0 1px 3px rgba(60, 40, 10, 0.12);
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #15120e;
  --surface: #1e1914;
  --text: #ece2cf;
  --muted: #a8977e;
  --accent: #d9a766;
  --accent-text: #1a140d;
  --border: #3a3127;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Amiri", "Times New Roman", serif;
  font-size: 1.15rem;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.2s, color 0.2s;
}

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

button, select {
  font: inherit;
  color: inherit;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  min-height: 44px;
  padding: 0.3em 1em;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow);
  font-size: 1rem;
  line-height: 1.2;
  white-space: nowrap;
}
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn:disabled { opacity: 0.4; cursor: default; }
.btn:focus-visible, select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
}

.icon-btn {
  width: 44px;
  padding: 0;
}

.icon { width: 20px; height: 20px; flex: none; }

/* Theme toggle shows the icon for the mode you'll switch to */
.icon-sun { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }

/* Mirror directional arrows in RTL */
[dir="rtl"] .icon-dir { transform: scaleX(-1); }

/* ---------- Index ---------- */

.home {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 16px 48px;
}

.home-top {
  display: flex;
  justify-content: flex-end;
}


.hero {
  text-align: center;
  margin: 8px 0 32px;
}

.hero h1 {
  font-size: clamp(1.9rem, 6vw, 2.8rem);
  line-height: 1.4;
  margin: 0 0 4px;
  font-weight: 700;
}

.hero .subtitle {
  color: var(--muted);
  margin: 0;
  font-size: 1.25rem;
}

.hero .en-title {
  margin-top: 12px;
  font-size: 1.2rem;
  color: var(--muted);
}

.ornament {
  color: var(--accent);
  font-size: 1.5rem;
  margin: 16px 0;
  letter-spacing: 0.5em;
}

.summaries {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 24px;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1.35rem;
  color: var(--accent);
}

.card h3 {
  margin: 16px 0 4px;
  font-size: 1.1rem;
}

.card p { margin: 0 0 8px; }

.card[lang="ar"] { font-size: 1.25rem; line-height: 2; }

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 32px 0 12px;
}

.actions .btn { min-width: 220px; font-size: 1.1rem; }

.continue {
  text-align: center;
  margin-bottom: 24px;
}

.disclaimer {
  max-width: 640px;
  margin: 24px auto 0;
  padding: 12px 16px;
  border-inline-start: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}
.disclaimer p { margin: 0; }
.disclaimer p + p { margin-top: 6px; }

/* Small links to the whole book as one text file per language */
.downloads {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 10px;
  margin-top: 28px;
  color: var(--muted);
  font-size: 0.85rem;
}
.downloads a { color: var(--muted); }
.downloads a:hover { color: var(--accent); }

@media (max-width: 700px) {
  .summaries { grid-template-columns: 1fr; }
  .actions .btn { width: 100%; }
}

/* ---------- Reader ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}

.topbar .spacer { flex: 1; }

/*
  Contents: the top bar's button says which section you're in and opens a
  panel of chapters (each folding its sections away) and a page-number box.
*/
.contents-btn {
  min-width: 0;
  max-width: min(22em, 50vw);
  padding-inline: 0.8em 1em;
}
.contents-label {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.contents-panel {
  width: min(34rem, calc(100vw - 32px));
  max-height: min(85vh, 52rem);
  margin: auto;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 16px 48px rgba(30, 20, 5, 0.35);
}
.contents-panel[open] { display: flex; flex-direction: column; }
.contents-panel::backdrop { background: rgba(20, 14, 6, 0.45); }

.contents-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 12px 8px 20px;
}
[dir="rtl"] .contents-head { padding: 12px 20px 8px 12px; }
.contents-title { flex: 1; margin: 0; font-size: 1.25rem; }

.page-jump {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 20px 12px;
  border-bottom: 1px solid var(--border);
}
.page-jump-label { color: var(--muted); }
.page-input {
  width: 5.5em;
  min-height: 44px;
  padding: 0 0.6em;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  text-align: center;
}
.page-input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.page-total { color: var(--muted); }
.page-go { margin-inline-start: auto; }

.contents-list,
.contents-sections {
  list-style: none;
  margin: 0;
  padding: 0;
}
.contents-list {
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 6px 8px 12px;
}
.contents-row { display: flex; align-items: center; }
.contents-toggle {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 999px;
  background: none;
  color: var(--muted);
  cursor: pointer;
}
.contents-toggle .icon { transition: transform 0.15s ease; }
[dir="rtl"] .contents-toggle .icon { transform: scaleX(-1); }
.contents-toggle[aria-expanded="true"] .icon { transform: rotate(90deg); }
.contents-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }

.contents-link {
  flex: 1;
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 40px;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
  line-height: 1.45;
}
.contents-link:hover { background: color-mix(in srgb, var(--accent) 10%, transparent); }
.contents-link:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.contents-link > span:first-child { flex: 1; }
.contents-page { color: var(--muted); font-size: 0.85em; font-variant-numeric: tabular-nums; }
.contents-link[aria-current] {
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  font-weight: 700;
}
.contents-entry.level-1 > .contents-row .contents-link { font-weight: 700; }
.contents-entry.level-1 > .contents-row:not(:has(.contents-toggle)) { padding-inline-start: 36px; }
.contents-entry.level-2 { padding-inline-start: 36px; }
.contents-entry.level-3 { padding-inline-start: 60px; font-size: 0.94em; }

@media (max-width: 600px) {
  .contents-panel {
    width: 100vw;
    max-width: none;
    height: 100dvh;
    max-height: none;
    border: 0;
    border-radius: 0;
  }
  .contents-btn { max-width: 46vw; }
  .contents-entry.level-2 { padding-inline-start: 28px; }
  .contents-entry.level-3 { padding-inline-start: 44px; }
}

/*
  The reader is a screen of its own: the bars above and below, and between them
  a track of pages that the browser scrolls and snaps sideways, each page
  scrolling up and down by itself.
*/
body.reader-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}

body.reader-page .topbar,
body.reader-page .bottombar {
  position: relative;
  flex: none;
}

.reader {
  flex: 1;
  min-height: 0;
  display: flex;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}

.reader::-webkit-scrollbar { display: none; }

.reader .slide {
  flex: 0 0 100%;
  overflow-y: auto;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  padding: 24px 16px 48px;
}

.reader .slide > * {
  max-width: 760px;
  margin-inline: auto;
}

.reader .slide article {
  transition: opacity 0.18s ease;
}

.reader .slide.loading article { opacity: 0.25; }

/*
  A fast swipe can reach a page that is still on its way. Show a spinner in
  the middle of it rather than a blank page; it fades in after a moment, so a
  page that arrives quickly never flashes one.
*/
.reader .slide.loading { position: relative; }

.reader .slide.loading::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 32px;
  height: 32px;
  margin: -16px 0 0 -16px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: slide-spinner-in 0.2s ease-out 0.15s both, slide-spin 0.8s linear infinite;
  pointer-events: none;
}

@keyframes slide-spinner-in { from { opacity: 0; } }
@keyframes slide-spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  .reader .slide.loading::before { animation: slide-spinner-in 0.2s ease-out 0.15s both, slide-spin 2.4s linear infinite; }
}

.reader p {
  margin: 0 0 0.9em;
  text-align: justify;
  hyphens: auto;
}

:root[lang="ar"] .reader {
  font-size: calc(1.4rem * var(--font-scale));
  line-height: 2.15;
}

:root[lang="en"] .reader {
  font-size: calc(1.2rem * var(--font-scale));
  line-height: 1.8;
}

.reader hr.fn-sep {
  width: 30%;
  margin: 1.5em 0 0.8em;
  margin-inline-end: auto;
  border: 0;
  border-top: 1px solid var(--muted);
}

.reader p.footnote {
  font-size: 0.8em;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 0.3em;
  text-align: start;
}

/* Page references in the indexes at the back of the book */
.reader a.ref {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  padding: 0.15em 0.2em;
  font-variant-numeric: tabular-nums;
}

.reader .error {
  text-align: center;
  color: var(--muted);
}

.en-note {
  margin-top: 2em;
  padding-top: 0.8em;
  border-top: 1px dashed var(--border);
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--muted);
}
.en-note a { color: var(--accent); }

.bottombar {
  position: fixed;
  inset-inline: 0;
  bottom: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-top: 1px solid var(--border);
}

.bottombar .counter {
  color: var(--muted);
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
  text-align: center;
  white-space: nowrap;
}

.font-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* − and + joined into one pill */
.font-size {
  display: inline-flex;
  border-radius: 999px;
  box-shadow: var(--shadow);
}

.font-size .btn {
  width: 44px;
  padding: 0;
  font-size: 1.4rem;
  line-height: 1;
  box-shadow: none;
}

.font-size .btn:first-child {
  border-radius: 999px 0 0 999px;
  border-right-width: 0;
}

.font-size .btn:last-child {
  border-radius: 0 999px 999px 0;
}

.font-size .btn + .btn {
  border-left-color: var(--border);
}

@media (max-width: 480px) {
  .topbar { padding: 8px 12px; gap: 6px; }
  .bottombar { padding-inline: 12px; }
  .bottombar #prev, .bottombar #next { width: 44px; padding: 0; }
  .bottombar .label { display: none; }
  .bottombar .counter { font-size: 0.85rem; }
}

/* First-visit tip that points at the text size buttons. */
#size-tip {
  position: fixed;
  z-index: 30;
  /*
    It is a tip, not something to get past. It lies over the page, so taking
    presses would swallow a swipe that began on it, and a tap meant for the
    text. Only its own button answers.
  */
  pointer-events: none;
  width: min(16rem, calc(100vw - 2rem));
  padding: 0.8rem 0.95rem 0.75rem;
  border-radius: 14px;
  background: var(--accent);
  color: var(--accent-text);
  box-shadow: 0 12px 32px rgba(40, 20, 0, 0.28);
  font-size: 1rem;
  line-height: 1.5;
  animation: size-tip-in 0.25s ease-out;
}
#size-tip[hidden] { display: none; }
#size-tip::after {
  content: "";
  position: absolute;
  bottom: -7px;
  left: var(--arrow-x, 50%);
  width: 14px;
  height: 14px;
  margin-left: -7px;
  background: var(--accent);
  transform: rotate(45deg);
  border-radius: 0 0 2px 0;
}
#size-tip p { margin: 0 0 0.6rem; }
#size-tip .size-tip-actions { display: flex; justify-content: flex-end; }
#size-tip .size-tip-close {
  pointer-events: auto;
  background: var(--accent-text);
  color: var(--accent);
  border: 0;
  border-radius: 999px;
  padding: 0.25rem 0.9rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.font-size.tip-target { animation: size-tip-pulse 1.6s ease-out infinite; }
@keyframes size-tip-in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
@keyframes size-tip-pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 55%, transparent); }
  100% { box-shadow: 0 0 0 10px transparent; }
}
@media (prefers-reduced-motion: reduce) {
  #size-tip, .font-size.tip-target { animation: none; }
}