/* Field Primer — immersive full-screen reader */

@import url("https://fonts.googleapis.com/css2?family=Literata:ital,opsz,wght@0,7..72,400;0,7..72,600;1,7..72,400&family=Lora:ital,wght@0,400;0,600;1,400&display=swap");

:root {
  --reader-paper: #f7f2e8;
  --reader-ink: #2e261c;
  --reader-muted: #6b5e4f;
  --reader-accent: #8b6914;
  --reader-code-bg: #ede6d6;
  --reader-code-ink: #5c4a32;
  --reader-border: rgba(46, 38, 28, 0.14);
  --reader-font: "Literata", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --reader-size: 1.25rem;
  --reader-leading: 1.88;
  --reader-width: min(48rem, 94vw);
  --reader-warmth: 14;
  --reader-texture: 1;
}

/* Floating open button (chapter pages) — library-quiet, not arcade */
.reader-launch {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.15rem;
  border: 1px solid rgba(196, 163, 90, 0.45);
  border-radius: 999px;
  background: rgba(247, 242, 232, 0.96);
  color: #2e261c;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: Georgia, "Times New Roman", serif;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.reader-launch:hover {
  transform: translateY(-1px);
  border-color: #8b6914;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.22);
}

.reader-launch:focus-visible {
  outline: 2px solid #8b6914;
  outline-offset: 3px;
}

.reader-launch svg {
  width: 1.1rem;
  height: 1.1rem;
  opacity: 0.9;
}

body.reader-active .reader-launch {
  display: none;
}

/* Full-screen reader shell */
.reader-shell {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100dvh;
  height: 100svh;
  z-index: 2000;
  display: none;
  flex-direction: column;
  background: #1a1510;
}

body.reader-active .reader-shell {
  display: flex;
}

body.reader-active {
  overflow: hidden;
  overscroll-behavior: none;
  position: fixed;
  width: 100%;
  height: 100%;
}

body.reader-active .reader-viewport {
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

body.reader-active > nav.top,
body.reader-active > header.chapter-hero,
body.reader-active > main.chapter-main,
body.reader-active > footer {
  visibility: hidden;
  pointer-events: none;
}

/* Toolbar */
.reader-toolbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 1rem;
  background: rgba(20, 16, 12, 0.92);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(12px);
}

.reader-toolbar-left,
.reader-toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.reader-title {
  font-family: var(--reader-font);
  font-size: 0.95rem;
  color: #e8dcc8;
  max-width: 28rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.reader-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.04);
  color: #e8dcc8;
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}

.reader-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(240, 208, 96, 0.35);
  color: #fff;
  text-decoration: none;
}

.reader-btn.primary {
  background: rgba(139, 105, 20, 0.35);
  border-color: rgba(240, 208, 96, 0.4);
}

/* Progress */
.reader-progress {
  flex-shrink: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
}

.reader-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #c4a35a, #f0d060);
  transition: width 0.1s linear;
}

/* Scroll viewport — the book */
.reader-viewport {
  flex: 1;
  overflow: auto;
  overflow-x: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-x pan-y;
}

.reader-zoom-hint {
  flex-shrink: 0;
  text-align: center;
  font-size: 0.72rem;
  color: rgba(232, 220, 200, 0.55);
  padding: 0.35rem 0.75rem;
  background: rgba(12, 10, 8, 0.5);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.reader-zoom-inner {
  --reader-zoom: 1;
  transform: scale(var(--reader-zoom));
  transform-origin: top center;
  width: calc(100% / var(--reader-zoom));
  margin: 0 auto;
  transition: transform 0.1s ease-out;
  will-change: transform;
}

.reader-zoom-pct {
  font-size: 0.75rem;
  color: #c4a35a;
  min-width: 2.75rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.reader-page {
  min-height: 100dvh;
  min-height: 100%;
  padding: 2.5rem max(1.25rem, env(safe-area-inset-left)) max(4rem, env(safe-area-inset-bottom)) max(1.25rem, env(safe-area-inset-right));
  display: flex;
  justify-content: center;
  background:
    radial-gradient(
      ellipse 120% 80% at 50% 0%,
      color-mix(in srgb, #f5e6c8 calc(var(--reader-warmth) * 1%), transparent) 0%,
      transparent 55%
    ),
    radial-gradient(
      ellipse 90% 60% at 50% 100%,
      rgba(30, 22, 14, 0.08) 0%,
      transparent 70%
    ),
    #2a2218;
}

.reader-paper {
  position: relative;
  width: 100%;
  max-width: var(--reader-width);
  padding: 3rem 3.25rem 3.5rem;
  background-color: var(--reader-paper);
  color: var(--reader-ink);
  font-family: var(--reader-font);
  font-size: var(--reader-size);
  line-height: var(--reader-leading);
  border-radius: 2px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.5) inset,
    0 2px 4px rgba(0, 0, 0, 0.06),
    0 24px 80px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(46, 38, 28, 0.08);
}

/* Paper grain texture */
.reader-paper::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: calc(var(--reader-texture) * 0.35);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  mix-blend-mode: multiply;
}

.reader-paper::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: inset 0 0 80px rgba(139, 105, 20, 0.04);
}

.reader-content {
  position: relative;
  z-index: 1;
  max-width: 100%;
}

/* White-on-white: force ink on cloned chapter content */
.reader-content,
.reader-content * {
  color: var(--reader-ink);
}

.reader-content code,
.reader-content pre,
.reader-content .eq {
  background-color: var(--reader-code-bg) !important;
  color: var(--reader-code-ink) !important;
  border-color: var(--reader-border) !important;
}

.reader-paper ::selection {
  background: color-mix(in srgb, var(--reader-accent) 25%, var(--reader-paper));
  color: var(--reader-ink);
}

.reader-paper[data-dark="true"] {
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.08) inset, 0 24px 80px rgba(0, 0, 0, 0.6);
}

/* Typography inside reader */
.reader-content .eyebrow {
  color: var(--reader-accent);
  letter-spacing: 0.18em;
  font-size: 0.78rem;
}

.reader-content h1,
.reader-content h2,
.reader-content h3 {
  color: var(--reader-ink);
  font-family: var(--reader-font);
  -webkit-text-fill-color: unset;
  background: none;
  border-left: none;
  padding-left: 0;
}

.reader-content h2 {
  margin-top: 2rem;
  font-size: 1.35rem;
  border-bottom: 1px solid var(--reader-border);
  padding-bottom: 0.4rem;
}

.reader-content h3 {
  color: var(--reader-accent);
  font-size: 1.1rem;
}

.reader-content a {
  color: var(--reader-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.reader-content a:hover {
  color: color-mix(in srgb, var(--reader-accent) 70%, var(--reader-ink));
}

.reader-content p + p {
  margin-top: 1rem;
}

.reader-content .on-the-way,
.reader-content .objectives,
.reader-content .chapter-summary-box {
  background: color-mix(in srgb, var(--reader-paper) 88%, var(--reader-accent) 12%);
  border: 1px solid var(--reader-border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0 2rem;
}

.reader-content .on-the-way h2,
.reader-content .objectives h2,
.reader-content .chapter-summary-box h2 {
  margin-top: 0;
  font-size: 1.15rem;
  border: none;
  padding: 0;
}

.reader-content .on-the-way-lead {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--reader-muted);
  margin-bottom: 1rem;
}

.reader-content .on-the-way-journey {
  margin: 0.75rem 0 0;
  padding-left: 1.25rem;
}

.reader-content .on-the-way-journey li {
  margin: 0.4rem 0;
}

.reader-content .on-the-way-figure {
  margin: 1rem 0 1.25rem;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--reader-border);
}

.reader-content .on-the-way-figure img {
  width: 100%;
  display: block;
  max-height: 220px;
  object-fit: cover;
}

.reader-content .on-the-way-figure figcaption {
  font-size: 0.82rem;
  color: var(--reader-muted);
  padding: 0.5rem 0.75rem;
  background: color-mix(in srgb, var(--reader-paper) 92%, var(--reader-ink) 8%);
}

.reader-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.92em;
}

.reader-content th,
.reader-content td {
  border: 1px solid var(--reader-border);
  padding: 0.5rem 0.65rem;
  text-align: left;
}

.reader-content th {
  background: color-mix(in srgb, var(--reader-paper) 75%, var(--reader-accent) 25%);
  color: var(--reader-accent);
}

.reader-content tr:nth-child(even) td {
  background: color-mix(in srgb, var(--reader-paper) 94%, var(--reader-ink) 6%);
}

.reader-content pre.eq,
.reader-content pre {
  font-family: ui-monospace, "Cascadia Code", monospace;
  background: var(--reader-code-bg);
  color: var(--reader-code-ink);
  border: 1px solid var(--reader-border);
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.86em;
}

.reader-content code {
  font-family: ui-monospace, monospace;
  font-size: 0.9em;
  color: var(--reader-code-ink);
  background: color-mix(in srgb, var(--reader-code-bg) 80%, transparent);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.reader-content .callout {
  border-left: 3px solid var(--reader-accent);
  padding: 0.85rem 1rem;
  margin: 1.25rem 0;
  background: color-mix(in srgb, var(--reader-paper) 90%, var(--reader-accent) 10%);
  border-radius: 0 6px 6px 0;
  font-size: 0.95em;
  color: var(--reader-ink);
}

.reader-content .figure {
  margin: 1.5rem 0;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--reader-border);
}

.reader-content .figure img {
  width: 100%;
  display: block;
}

.reader-content .figure figcaption {
  font-size: 0.85rem;
  color: var(--reader-muted);
  padding: 0.6rem 0.85rem;
}

.reader-content .tag {
  font-size: 0.72rem;
  border-color: var(--reader-border);
}

.reader-content .tag.impl { color: #2d6a4f; border-color: #2d6a4f; }
.reader-content .tag.meta { color: #6b4c9a; border-color: #6b4c9a; }
.reader-content .tag.phil { color: var(--reader-accent); }
.reader-content .tag.vis { color: var(--reader-muted); }

/* ── Textbook reader: override dark-site globals on paper ── */
/* Remap site tokens on cloned chapter — any rule using var(--text) etc. stays readable */
.reader-content > main.chapter-main,
.reader-content main.chapter-main {
  --text: var(--reader-ink);
  --muted: var(--reader-muted);
  --bg: var(--reader-paper);
  --bg2: color-mix(in srgb, var(--reader-paper) 88%, var(--reader-ink) 12%);
  --panel: color-mix(in srgb, var(--reader-paper) 90%, var(--reader-accent) 10%);
  --border: var(--reader-border);
  --gold: var(--reader-accent);
  --phi: var(--reader-accent);
  --accent: var(--reader-accent);
  --thermo: color-mix(in srgb, var(--reader-accent) 70%, #9a4a0a 30%);
  --flow: #6b4c9a;
  --ok: #2d6a4f;
}

.reader-paper,
.reader-paper .chapter-main {
  color: var(--reader-ink);
  background: transparent;
}

.reader-content p,
.reader-content li,
.reader-content td,
.reader-content th,
.reader-content dd,
.reader-content blockquote,
.reader-content .chapter-main p,
.reader-content .chapter-main li,
.reader-content .chapter-main td,
.reader-content .chapter-main th {
  color: var(--reader-ink);
}

.reader-content .chapter-main h2 {
  color: var(--reader-ink);
  border-bottom-color: var(--reader-border);
}

.reader-content h3,
.reader-content .chapter-main h3 {
  color: var(--reader-accent);
}

.reader-content .muted,
.reader-content .chapter-main .muted {
  color: var(--reader-muted);
}

.reader-content .mayer-segment {
  background: color-mix(in srgb, var(--reader-paper) 90%, var(--reader-accent) 10%);
  border: 1px solid var(--reader-border);
  border-left: 4px solid var(--reader-accent);
  color: var(--reader-ink);
}

.reader-content .mayer-segment-label {
  color: var(--reader-muted);
}

.reader-content .mayer-segment h2 {
  color: var(--reader-ink);
  border-bottom-color: var(--reader-border);
}

.reader-content .lead-up {
  background: color-mix(in srgb, var(--reader-paper) 82%, var(--reader-accent) 18%);
  border: 1px dashed var(--reader-border);
  color: var(--reader-ink);
}

.reader-content .lead-up-label {
  color: var(--reader-accent);
}

.reader-content .professor-grok {
  background: color-mix(in srgb, var(--reader-paper) 78%, #c4a35a 22%);
  border: 1px solid var(--reader-border);
  border-left: 4px solid var(--reader-accent);
  color: var(--reader-ink);
}

.reader-content .professor-grok-label {
  color: var(--reader-accent);
}

.reader-content .professor-grok p {
  color: var(--reader-ink);
}

.reader-content .segment-citations {
  background: color-mix(in srgb, var(--reader-paper) 88%, var(--reader-ink) 12%);
  border: 1px solid var(--reader-border);
  color: var(--reader-ink);
}

.reader-content .segment-citations-label {
  color: var(--reader-muted);
}

.reader-content .segment-citations a {
  color: var(--reader-accent);
}

.reader-content .chapter-toc {
  background: color-mix(in srgb, var(--reader-paper) 85%, var(--reader-accent) 15%);
  border: 1px solid var(--reader-border);
  color: var(--reader-ink);
}

.reader-content .chapter-toc h2 {
  color: var(--reader-muted);
}

.reader-content .chapter-toc a {
  color: var(--reader-accent);
}

.reader-content .evidence-anchor {
  background: color-mix(in srgb, var(--reader-paper) 82%, #c4a35a 18%);
  border: 1px solid var(--reader-border);
  color: var(--reader-ink);
}

.reader-content .evidence-anchor h2 {
  color: var(--reader-ink);
}

.reader-content .eq-block,
.reader-content div.eq {
  background: var(--reader-code-bg);
  color: var(--reader-code-ink);
  border: 1px solid var(--reader-border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
}

.reader-content .grep-hook {
  background: var(--reader-code-bg);
  color: var(--reader-code-ink);
  border: 1px solid var(--reader-border);
}

.reader-content .sacred-workshop,
.reader-content .creditor-workshop,
.reader-content .covenant-workshop {
  background: color-mix(in srgb, var(--reader-paper) 88%, var(--reader-accent) 12%);
  border-left: 4px solid var(--reader-accent);
  color: var(--reader-ink);
}

.reader-content .chapter-summary-box h2 {
  color: var(--reader-accent);
}

.reader-content .callout.science,
.reader-content .callout.drill {
  border-left-color: var(--reader-accent);
  background: color-mix(in srgb, var(--reader-paper) 88%, var(--reader-accent) 12%);
  color: var(--reader-ink);
}

.reader-content .callout.everyone {
  border-left-color: #2d6a4f;
  background: color-mix(in srgb, var(--reader-paper) 90%, #2d6a4f 10%);
  color: var(--reader-ink);
}

.reader-content .callout.love {
  border-left-color: #9a6b4c;
  background: color-mix(in srgb, var(--reader-paper) 90%, #c4a35a 10%);
  color: var(--reader-ink);
}

.reader-content .callout.god,
.reader-content .callout.axiom {
  border-left-color: var(--reader-accent);
  background: color-mix(in srgb, var(--reader-paper) 85%, #c4a35a 15%);
  color: var(--reader-ink);
}

.reader-content .katex,
.reader-content .katex-display {
  color: var(--reader-ink);
}

.reader-content .objectives h2,
.reader-content .on-the-way h2 {
  color: var(--reader-ink);
}

.reader-content .figure .claim-tie {
  color: var(--reader-muted);
}

.reader-content .chapter-nav {
  display: none;
}

.reader-content main.chapter-main :is(h1, h2, h3, h4, p, li, td, th, dd, dt, blockquote, figcaption, label, pre, code, .part-label) {
  -webkit-text-fill-color: unset;
}

/* Settings panel */
.reader-settings {
  position: fixed;
  top: 0;
  right: 0;
  width: min(320px, 92vw);
  height: 100%;
  z-index: 2100;
  background: rgba(22, 18, 14, 0.97);
  border-left: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(16px);
  transform: translateX(100%);
  transition: transform 0.28s ease;
  overflow-y: auto;
  padding: 1.25rem 1.25rem 2rem;
  color: #e8dcc8;
}

.reader-settings.open {
  transform: translateX(0);
}

.reader-settings h3 {
  font-family: var(--reader-font);
  font-size: 1.1rem;
  margin: 0 0 0.25rem;
  color: #f5e6c8;
}

.reader-settings .settings-eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #a89070;
  margin-bottom: 1rem;
}

.reader-settings section {
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.reader-settings label {
  display: block;
  font-size: 0.78rem;
  color: #a89070;
  margin-bottom: 0.35rem;
}

.reader-preset-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.reader-preset {
  padding: 0.65rem 0.5rem;
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  cursor: pointer;
  text-align: center;
  font-size: 0.78rem;
  transition: border-color 0.15s, transform 0.15s;
}

.reader-preset:hover {
  transform: translateY(-1px);
}

.reader-preset.active {
  border-color: #f0d060;
  box-shadow: 0 0 0 1px rgba(240, 208, 96, 0.3);
}

.reader-preset-swatch {
  display: block;
  width: 100%;
  height: 28px;
  border-radius: 4px;
  margin-bottom: 0.35rem;
  border: 1px solid rgba(0, 0, 0, 0.15);
}

.reader-preset.vanilla .reader-preset-swatch {
  background: linear-gradient(135deg, #faf6ed 0%, #f0e4c8 100%);
}

.reader-preset.parchment .reader-preset-swatch {
  background: linear-gradient(135deg, #f3ead8 0%, #e8dcc0 100%);
}

.reader-preset.sepia .reader-preset-swatch {
  background: linear-gradient(135deg, #e8dcc4 0%, #d4c4a8 100%);
}

.reader-preset.midnight .reader-preset-swatch {
  background: linear-gradient(135deg, #0f1a2e 0%, #040810 100%);
}

.reader-preset.field .reader-preset-swatch {
  background: linear-gradient(135deg, #0a1220 0%, #1a2840 100%);
}

.reader-preset.classroom .reader-preset-swatch {
  background: linear-gradient(135deg, #fffef9 0%, #f4f4f0 100%);
}

.reader-advanced-note {
  font-size: 0.75rem;
  color: #a89070;
  margin: 0.25rem 0 0.5rem;
  line-height: 1.45;
}

.reader-reset-vanilla {
  width: 100%;
  justify-content: center;
  margin-top: 0.25rem;
}

.reader-btn:focus-visible,
.reader-preset:focus-visible {
  outline: 2px solid #f0d060;
  outline-offset: 2px;
}

.reader-settings input[type="color"] {
  width: 100%;
  height: 36px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  background: transparent;
}

.reader-settings input[type="range"] {
  width: 100%;
  accent-color: #c4a35a;
}

.reader-settings select {
  width: 100%;
  padding: 0.5rem;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(0, 0, 0, 0.25);
  color: #e8dcc8;
  font-size: 0.85rem;
}

.reader-settings-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
}

.reader-vanilla-note {
  font-size: 0.8rem;
  font-style: italic;
  color: #c4a35a;
  margin-top: 0.5rem;
  line-height: 1.5;
}

.reader-settings-overlay {
  position: fixed;
  inset: 0;
  z-index: 2050;
  background: rgba(0, 0, 0, 0.4);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
}

.reader-settings-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

/* ── Tablet (portrait + landscape) ── */
@media (max-width: 1024px) {
  .reader-page {
    padding: 1.75rem 1rem 3rem;
  }

  .reader-paper {
    padding: 2.5rem 2rem 3rem;
    box-shadow:
      0 1px 0 rgba(255, 255, 255, 0.45) inset,
      0 16px 48px rgba(0, 0, 0, 0.38);
  }

  .reader-toolbar {
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
  }
}

/* ── Phone ── */
@media (max-width: 768px) {
  .reader-shell {
    height: 100dvh;
    height: -webkit-fill-available;
    min-height: 100vh;
  }

  .reader-launch {
    bottom: max(1rem, env(safe-area-inset-bottom));
    right: max(1rem, env(safe-area-inset-right));
    left: auto;
    padding: 0.75rem 1.15rem;
    font-size: 0.95rem;
    min-height: 44px;
    min-width: 44px;
  }

  .reader-toolbar {
    flex-wrap: wrap;
    padding-top: max(0.5rem, env(safe-area-inset-top));
    gap: 0.5rem;
  }

  .reader-toolbar-left {
    flex: 1 1 100%;
    order: 1;
  }

  .reader-toolbar-right {
    flex: 1 1 100%;
    order: 2;
    justify-content: stretch;
    gap: 0.4rem;
  }

  .reader-title {
    max-width: none;
    flex: 1;
    font-size: 0.88rem;
    line-height: 1.35;
    white-space: normal;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .reader-btn {
    flex: 1;
    min-height: 44px;
    padding: 0.55rem 0.65rem;
    font-size: 0.82rem;
    touch-action: manipulation;
  }

  .reader-toolbar-right .reader-btn.primary {
    flex: 1.2;
  }

  .reader-page {
    padding: 0.75rem 0.65rem 2rem;
    padding-bottom: max(2rem, env(safe-area-inset-bottom));
  }

  .reader-paper {
    padding: 1.75rem 1.15rem 2.25rem;
    border-radius: 1px;
    max-width: 100%;
  }

  .reader-content h2 {
    font-size: 1.2rem;
    margin-top: 1.75rem;
  }

  .reader-content h3 {
    font-size: 1.02rem;
  }

  .reader-content .on-the-way,
  .reader-content .objectives,
  .reader-content .chapter-summary-box {
    padding: 1rem 1.1rem;
    margin: 1.25rem 0 1.5rem;
  }

  .reader-content table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 0.82em;
  }

  .reader-content table thead,
  .reader-content table tbody,
  .reader-content table tr {
    display: table;
    width: 100%;
    min-width: 520px;
  }

  .reader-content pre.eq,
  .reader-content pre {
    font-size: 0.78em;
    padding: 0.75rem;
  }

  .reader-content .on-the-way-figure img,
  .reader-content .figure img {
    max-height: 200px;
    object-fit: cover;
  }

  /* Settings: bottom sheet on phone */
  .reader-settings {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-height: min(88dvh, 92vh);
    height: auto;
    border-left: none;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px 16px 0 0;
    transform: translateY(100%);
    padding-bottom: max(1.5rem, env(safe-area-inset-bottom));
  }

  .reader-settings.open {
    transform: translateY(0);
  }

  .reader-settings::before {
    content: "";
    display: block;
    width: 36px;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    margin: 0 auto 1rem;
  }

  .reader-preset-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .reader-preset {
    min-height: 44px;
    padding: 0.5rem 0.35rem;
    font-size: 0.7rem;
  }

  .reader-settings input[type="color"],
  .reader-settings select,
  .reader-settings input[type="range"] {
    min-height: 44px;
  }
}

/* ── Narrow phone ── */
@media (max-width: 400px) {
  .reader-preset-grid {
    grid-template-columns: 1fr 1fr;
  }

  .reader-launch span.label-full {
    display: none;
  }

  .reader-paper {
    padding: 1.35rem 0.95rem 2rem;
  }
}

/* ── Landscape phone / small tablet ── */
@media (max-height: 500px) and (orientation: landscape) {
  .reader-page {
    padding: 0.5rem 1.5rem 1.5rem;
  }

  .reader-paper {
    padding: 1.25rem 2rem 1.75rem;
  }

  .reader-toolbar {
    padding-top: 0.35rem;
    padding-bottom: 0.35rem;
  }

  .reader-settings {
    max-height: 95dvh;
  }
}

/* ── Home page: Reading room (schools + home) ── */
.reader-room {
  background: linear-gradient(180deg, rgba(247, 242, 232, 0.06) 0%, transparent 100%);
  border-bottom: 1px solid var(--border, rgba(255, 255, 255, 0.08));
}

.reader-room-inner {
  max-width: min(96vw, 1280px);
  margin: 0 auto;
  padding: 2.5rem max(1.25rem, env(safe-area-inset-left)) max(3rem, env(safe-area-inset-bottom)) max(1.25rem, env(safe-area-inset-right));
  display: grid;
  grid-template-columns: 1fr min(320px, 40vw);
  gap: 2.5rem;
  align-items: center;
  width: 100%;
}

.reader-room-copy h2 {
  margin: 0.35rem 0 0.75rem;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
}

.reader-room-copy p {
  color: var(--muted, #8aa4c8);
  line-height: 1.65;
  margin: 0 0 1rem;
}

.reader-room-features {
  margin: 0 0 1.25rem;
  padding-left: 1.2rem;
  color: var(--text, #e8f2ff);
  font-size: 1.05rem;
  line-height: 1.6;
}

.reader-room-features li {
  margin: 0.35rem 0;
}

.reader-room-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.25rem;
}

.reader-room-cta .btn-reader-vanilla {
  background: #f7f2e8;
  color: #2e261c;
  border: 1px solid rgba(139, 105, 20, 0.35);
  font-family: Georgia, "Times New Roman", serif;
}

.reader-room-cta .btn-reader-vanilla:hover {
  background: #faf6ed;
  border-color: #8b6914;
}

.reader-preview-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
}

.reader-preview-label {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted, #8aa4c8);
}

#reader-room-preview {
  width: 100%;
  max-width: 260px;
  aspect-ratio: 3 / 4;
  padding: 1.35rem 1.25rem;
  border-radius: 3px;
  background-color: var(--preview-paper, #f7f2e8);
  color: var(--preview-ink, #2e261c);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.5) inset,
    0 12px 40px rgba(0, 0, 0, 0.28);
  position: relative;
  overflow: hidden;
  font-family: "Literata", Georgia, serif;
  font-size: 0.82rem;
  line-height: 1.65;
}

#reader-room-preview::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: calc(var(--preview-texture, 1) * 0.3);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  background-size: 120px 120px;
  mix-blend-mode: multiply;
  pointer-events: none;
}

.reader-preview-title {
  position: relative;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 0.65rem;
  color: var(--preview-ink);
}

.reader-preview-body {
  position: relative;
  margin: 0;
  color: var(--preview-ink);
}

.reader-preview-muted {
  position: relative;
  display: block;
  margin-top: 0.75rem;
  font-size: 0.72rem;
  color: var(--preview-muted, #6b5e4f);
}

.reader-preview-code {
  position: relative;
  display: block;
  margin-top: 0.75rem;
  padding: 0.45rem 0.5rem;
  font-family: ui-monospace, monospace;
  font-size: 0.68rem;
  background: var(--preview-code-bg, #ede6d6);
  border-radius: 3px;
  color: var(--preview-code-ink, #5c4a32);
}

.reader-room kbd {
  font-family: ui-monospace, monospace;
  font-size: 0.85em;
  padding: 0.1em 0.35em;
  border-radius: 3px;
  border: 1px solid var(--border, rgba(255, 255, 255, 0.15));
  background: rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
  .reader-room-inner {
    grid-template-columns: 1fr;
    padding: 2rem 1.25rem 2.5rem;
    gap: 1.5rem;
  }

  .reader-preview-wrap {
    order: -1;
  }

  #reader-room-preview {
    max-width: 220px;
    margin: 0 auto;
  }

  .reader-room-cta .btn {
    flex: 1 1 auto;
    min-height: 44px;
    text-align: center;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .reader-settings,
  .reader-settings-overlay,
  .reader-launch,
  .reader-progress-bar {
    transition: none;
  }
}