:root {
  --reader-font: "Literata", "Iowan Old Style", Georgia, serif;
  --reader-size: 21px;
  --reader-line-height: 2.7;
  --reader-margin: 15vw;
  --reader-align: justify;
  --topbar-h: 58px;
  --ui-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;

  /* Flexoki-inspired reading palette */
  --page-bg: #FFFCF0;
  --text: #292929;
  --muted: #6F6E69;
  --hairline: rgba(16, 15, 15, 0.12);
  --panel-bg: rgba(255, 252, 240, 0.96);
  --knob: #FFFFFF;

  /* Observation ink. Pencil marks use --ink, open questions use --open,
     grouped marks (repeats, people) cycle through --c0..--c5. */
  --ink: #205EA6;
  --open: #A02F6F;
  --c0: #AF3029;
  --c1: #BC5215;
  --c2: #AD8301;
  --c3: #66800B;
  --c4: #24837B;
  --c5: #5E409D;
  --rep-mix: 24%;
  --rep-alpha: .13;
  --ring-alpha: .45;
  --line-alpha: .5;
}

* { box-sizing: border-box; }

html { background: var(--page-bg); }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--page-bg);
  color: var(--text);
  font-family: var(--ui-font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overscroll-behavior-x: none;
}

/* Paper grain over everything. Fixed and click-through, so it never moves
   with the page or gets in the way of a tap. */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 2147483000;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 1.4 -.35'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  opacity: var(--grain, .07);
}

/* On dark pages the grain is light specks instead of dark ones. */
:root[data-tone="dark"] { --grain: .05; }
:root[data-tone="dark"] body::after { filter: invert(1); }

::selection { background: color-mix(in srgb, var(--ink) 22%, transparent); }

/* ---------- Top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  transition: transform .25s ease;
  height: var(--topbar-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 18px;
  background: var(--page-bg);
  color: var(--text);
}

/* Hide the bar while reading down the page; it returns on any scroll up. */
body.bar-hidden .topbar { transform: translateY(-100%); }

/* The bar steps back while reading and comes forward under the pointer. */
@media (hover: hover) {
  .topbar > * { opacity: .35; transition: opacity .2s ease; }
  .topbar:hover > *,
  .topbar:focus-within > *,
  .topbar:has(.settings-panel.open) > * { opacity: 1; }
}

.modes {
  justify-self: start;
  display: inline-flex;
  gap: 18px;
}

.mode-button {
  border: 0;
  padding: 6px 0;
  background: transparent;
  color: color-mix(in srgb, var(--muted) 80%, transparent);
  font: 13px/1 var(--ui-font);
  cursor: pointer;
}

.mode-button:hover { color: var(--text); }
.mode-button.active { color: var(--text); font-weight: 500; }

.book-meta {
  grid-column: 2;
  text-align: center;
  line-height: 1.15;
}

.book-title {
  display: block;
  width: auto;
  max-width: 240px;
  margin: 0 auto;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--text);
  text-align: center;
  font: 600 14px/1.15 var(--ui-font);
  letter-spacing: -0.01em;
  outline: none;
  cursor: pointer;
}

.top-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 4px;
}

.marks-button {
  display: none;
  height: 34px;
  border: 0;
  border-radius: 17px;
  padding: 0 12px;
  background: transparent;
  color: var(--text);
  font: 13px/1 var(--ui-font);
  cursor: pointer;
}

body[data-mode="observe"] .marks-button { display: inline-flex; align-items: center; gap: 6px; }

.marks-button:hover,
.marks-button.active { background: color-mix(in srgb, var(--text) 7%, transparent); }

.marks-count {
  color: var(--muted);
  font-size: 12px;
}

.book-menu {
  position: fixed;
  top: calc(var(--topbar-h) + 8px);
  left: 50%;
  z-index: 30;
  width: min(360px, calc(100vw - 24px));
  max-height: min(72vh, 680px);
  overflow-y: auto;
  transform: translateX(-50%);
  padding: 10px;
  border: 1px solid var(--hairline);
  border-radius: 16px;
  background: var(--panel-bg);
  box-shadow: 0 16px 42px rgba(0,0,0,.18);
  display: none;
}

.book-menu.open { display: block; }

.book-section + .book-section { margin-top: 14px; }

.book-section-title {
  padding: 9px 10px 7px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
}

.book-option {
  display: block;
  width: 100%;
  border: 0;
  border-radius: 10px;
  padding: 9px 10px;
  background: transparent;
  color: var(--text);
  text-align: left;
  font: 14px/1.2 var(--ui-font);
  cursor: pointer;
}

.book-option:hover,
.book-option:focus-visible {
  background: color-mix(in srgb, var(--text) 8%, transparent);
  outline: none;
}

.book-option.active {
  background: color-mix(in srgb, var(--text) 12%, transparent);
  font-weight: 600;
}

.settings-wrap { position: relative; }

.settings-button {
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text);
  font: 600 16px/1 var(--ui-font);
  cursor: pointer;
}

.settings-button:hover,
.settings-button:focus-visible {
  background: color-mix(in srgb, var(--text) 7%, transparent);
  outline: none;
}

.settings-panel {
  position: absolute;
  top: 44px;
  right: 0;
  width: 286px;
  padding: 18px;
  background: var(--panel-bg);
  border: 1px solid var(--hairline);
  border-radius: 16px;
  box-shadow: 0 16px 42px rgba(25,24,20,.13);
  display: none;
}

.settings-panel.open { display: block; }
.settings-panel {
  max-height: calc(100vh - 70px);
  overflow-y: auto;
}

.control + .control { margin-top: 18px; }

.control label {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  color: var(--muted);
}

select,
input[type="range"] { width: 100%; }

.select-wrap { position: relative; }

.select-wrap::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 14px;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

select {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--hairline);
  border-radius: 10px;
  background: color-mix(in srgb, var(--text) 4%, transparent);
  color: var(--text);
  padding: 10px 34px 10px 11px;
  font: 14px/1.2 var(--ui-font);
  outline: none;
  cursor: pointer;
}

select:focus-visible { border-color: color-mix(in srgb, var(--text) 35%, transparent); }
select option { background: var(--page-bg); color: var(--text); }

.range-row {
  display: grid;
  grid-template-columns: 30px 1fr 38px;
  gap: 10px;
  align-items: center;
}

.range-mark {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}

.option-row { display: grid; gap: 8px; }
.option-row.three { grid-template-columns: repeat(3, 1fr); }
.option-row.two { grid-template-columns: repeat(2, 1fr); }

.option-button {
  border: 1px solid var(--hairline);
  border-radius: 9px;
  padding: 9px 8px;
  background: transparent;
  color: var(--text);
  font: 13px/1 var(--ui-font);
  cursor: pointer;
}

.option-button:hover { background: color-mix(in srgb, var(--text) 5%, transparent); }

.option-button.danger-armed {
  border-color: color-mix(in srgb, #D14D41 60%, transparent);
  color: #D14D41;
}

.control-hint {
  margin-top: 8px;
  font-size: 11.5px;
  line-height: 1.45;
  color: var(--muted);
}

.option-button.active {
  border-color: color-mix(in srgb, var(--text) 32%, transparent);
  background: color-mix(in srgb, var(--text) 10%, transparent);
  font-weight: 600;
}

/* Sliders drawn from theme tokens so they sit quietly on every background.
   --fill is kept in sync by script to show the filled part of the track. */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 22px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(
    to right,
    color-mix(in srgb, var(--text) 55%, transparent) var(--fill, 50%),
    color-mix(in srgb, var(--text) 14%, transparent) var(--fill, 50%)
  );
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -6.5px;
  border: 1px solid var(--hairline);
  border-radius: 50%;
  background: var(--knob);
  box-shadow: 0 1px 3px rgba(0,0,0,.25);
}

input[type="range"]::-moz-range-track {
  height: 3px;
  border-radius: 2px;
  background: color-mix(in srgb, var(--text) 14%, transparent);
}

input[type="range"]::-moz-range-progress {
  height: 3px;
  border-radius: 2px;
  background: color-mix(in srgb, var(--text) 55%, transparent);
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 1px solid var(--hairline);
  border-radius: 50%;
  background: var(--knob);
  box-shadow: 0 1px 3px rgba(0,0,0,.25);
}

input[type="range"]:focus-visible { outline: none; }
input[type="range"]:focus-visible::-webkit-slider-thumb { border-color: var(--text); }

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

main {
  position: relative;
  min-height: calc(100vh - var(--topbar-h));
  padding: 56px max(24px, var(--reader-margin)) 120px;
}

.chapter {
  position: relative;
  /* Keep lines near 65 to 70 characters. Longer lines tire the eyes
     because each return sweep to the next line is harder to land. */
  width: min(100%, calc(var(--reader-size) * 33));
  margin: 0 auto;
}

.book-heading {
  margin: 0 0 34px;
  text-align: center;
  font-family: "UnifrakturMaguntia", var(--reader-font);
  font-size: calc(var(--reader-size) * 2.2);
  line-height: 1.1;
  font-weight: 400;
  letter-spacing: 0;
}



.scripture {
  margin: 0;
  font-family: var(--reader-font);
  font-size: var(--reader-size);
  line-height: var(--reader-line-height);
  font-weight: 400;
  letter-spacing: 0;
  text-align: var(--reader-align);
}

body[data-mode="observe"] .scripture { cursor: text; }

.navigation-zone {
  position: fixed;
  top: var(--topbar-h);
  bottom: 0;
  width: 18vw;
  min-width: 54px;
  max-width: 220px;
  z-index: 8;
  border: 0;
  padding: 0;
  background: transparent;
  cursor: pointer;
}

.navigation-zone.previous { left: 0; }
.navigation-zone.next { right: 0; }

.navigation-zone:focus-visible {
  outline: 1px solid var(--hairline);
  outline-offset: -1px;
}

/* The margins are part of the working surface while observing. */
body[data-mode="observe"] .navigation-zone { display: none; }

.loading { color: var(--muted); }