/* =========================================================
   In Everything — Reader
   Variable-font, multi-format, reactive reading environment
   ========================================================= */

/* ---- font stack: variable fonts via Google ---- */
@import url('https://fonts.googleapis.com/css2?family=Spectral:ital,wght@0,300;0,400;0,500;0,600;1,400;1,500&family=EB+Garamond:ital,wght@0,400;0,500;1,400&family=Crimson+Pro:ital,wght@0,300..700;1,300..700&family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;1,400&family=JetBrains+Mono:ital,wght@0,400;0,500;0,700;1,400&family=IBM+Plex+Mono:ital,wght@0,400;0,500;1,400&family=Inter:wght@300..700&family=Caveat:wght@400..700&family=Kalam:wght@400;700&family=Gloria+Hallelujah&family=Source+Serif+4:ital,wght@0,300..700;1,400&family=Newsreader:ital,wght@0,400..700;1,400..700&family=Fraunces:ital,opsz,wght@0,9..144,300..700;1,9..144,400..700&display=swap');

/* ---- root ---- */
:root {
  /* defaults — overridden per chapter via .chapter[data-chapter] */
  --bg: #0a0e14;
  --ink: #c9d4e0;
  --dim: #5a6878;
  --accent: #7da3c4;
  --glow: #9ec4e8;
  --paper: var(--bg);

  --type-body: 'Source Serif 4', 'Spectral', Georgia, serif;
  --type-display: 'Fraunces', 'Newsreader', Georgia, serif;
  --type-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, monospace;
  --type-hand: 'Caveat', 'Kalam', cursive;
  --type-clinical: 'Inter', system-ui, sans-serif;

  --reading-size: 19px;
  --reading-line: 1.65;
  --reading-measure: 36rem;

  --transition: 1200ms cubic-bezier(.5,.05,.2,1);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; height: 100dvh; overflow: hidden; overscroll-behavior: none; -webkit-tap-highlight-color: transparent; -webkit-touch-callout: none; touch-action: pan-y; }
@supports (padding: env(safe-area-inset-top)) {
  .chrome-top { padding-top: max(18px, env(safe-area-inset-top)); padding-left: max(28px, env(safe-area-inset-left)); padding-right: max(28px, env(safe-area-inset-right)); }
  .signal-strip { padding-bottom: max(18px, env(safe-area-inset-bottom)); padding-left: max(28px, env(safe-area-inset-left)); padding-right: max(28px, env(safe-area-inset-right)); }
  .drawer { padding-top: env(safe-area-inset-top); padding-bottom: env(safe-area-inset-bottom); }
  .compendium { padding-top: env(safe-area-inset-top); padding-bottom: env(safe-area-inset-bottom); }
  .echo-head { padding-top: max(16px, env(safe-area-inset-top)); }
  .cover { padding-top: env(safe-area-inset-top); padding-bottom: env(safe-area-inset-bottom); }
}
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--type-body);
  font-size: var(--reading-size);
  line-height: var(--reading-line);
  font-feature-settings: "kern", "liga", "onum";
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0; }
a { color: var(--accent); text-decoration: none; }

/* ============================================================
   STAGE — the reader stage
   ============================================================ */

#stage {
  position: fixed;
  inset: 0;
  height: 100vh;
  height: 100dvh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--bg);
  transition: background var(--transition);
}

/* ---- top chrome ---- */
.chrome-top {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  padding: 18px 28px;
  gap: 24px;
  z-index: 50;
  pointer-events: none;
}
.chrome-top > * { pointer-events: auto; }

.brand {
  font-family: var(--type-display);
  font-weight: 350;
  font-style: italic;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--dim);
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.brand .title-mark {
  font-style: normal;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--ink);
  opacity: 0.85;
}
.brand .author {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  opacity: 0.7;
}

.chapter-meta {
  text-align: center;
  font-family: var(--type-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--dim);
  display: flex;
  flex-direction: column;
  gap: 2px;
  align-items: center;
}
.chapter-meta .ch-num { opacity: 0.55; }
.chapter-meta .ch-title { color: var(--ink); opacity: 0.78; letter-spacing: 0.16em; }

.chrome-tools {
  display: flex;
  gap: 4px;
  align-items: center;
}
.tool-btn {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: 999px;
  color: var(--dim);
  transition: color 200ms, background 200ms;
}
.tool-btn:hover { color: var(--ink); background: color-mix(in oklab, var(--ink) 6%, transparent); }
.tool-btn svg { width: 16px; height: 16px; stroke-width: 1.5; fill: none; stroke: currentColor; }

/* ============================================================
   PAGE — the reading surface
   ============================================================ */
.page-wrap {
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  padding: 0 24px;
}

.page {
  width: 100%;
  max-width: var(--reading-measure);
  height: 100%;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: 8px 0;
}

.page-content {
  position: absolute;
  inset: 0;
  padding: 0;
  overflow: hidden;
  font-variant-numeric: oldstyle-nums;
}

/* page transition */
.page-content.entering { animation: pageEnter 700ms cubic-bezier(.2,.6,.2,1) both; }
.page-content.exiting  { animation: pageExit  450ms cubic-bezier(.6,.1,.8,.2) both; }
.page-content.entering-back { animation: pageEnterBack 700ms cubic-bezier(.2,.6,.2,1) both; }
.page-content.exiting-back  { animation: pageExitBack  450ms cubic-bezier(.6,.1,.8,.2) both; }

@keyframes pageEnter   { from { opacity: 0; transform: translateY(14px); filter: blur(8px); } to { opacity: 1; transform: none; filter: none; } }
@keyframes pageExit    { from { opacity: 1; transform: none; } to { opacity: 0; transform: translateY(-12px); filter: blur(6px); } }
@keyframes pageEnterBack { from { opacity: 0; transform: translateY(-14px); filter: blur(8px); } to { opacity: 1; transform: none; filter: none; } }
@keyframes pageExitBack  { from { opacity: 1; transform: none; } to { opacity: 0; transform: translateY(12px); filter: blur(6px); } }

/* ---- prose typography ---- */
.prose p {
  margin: 0 0 1.05em;
  text-wrap: pretty;
  hyphens: auto;
}
.prose p:first-child { text-indent: 0; }
.prose p + p { text-indent: 1.5em; }
.prose hr {
  border: 0;
  text-align: center;
  margin: 2.4em 0;
  height: 0.5em;
  position: relative;
}
.prose hr::after {
  content: '·   ·   ·';
  letter-spacing: 0.6em;
  color: var(--dim);
  font-size: 0.9em;
}
.prose em { font-style: italic; }
.prose strong { font-weight: 600; }
.prose .dropcap::first-letter {
  font-family: var(--type-display);
  font-size: 3.6em;
  line-height: 0.9;
  float: left;
  padding: 0.06em 0.08em 0 0;
  font-weight: 350;
  color: var(--ink);
}

/* ---- chapter-opener block ---- */
.opener {
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
  text-align: center;
  gap: 24px;
  padding: 0 8px;
}
.opener .number {
  font-family: var(--type-mono);
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--dim);
  text-transform: uppercase;
}
.opener .title {
  font-family: var(--type-display);
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.05;
  font-weight: 300;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.opener .epigraph {
  font-family: var(--type-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  max-width: 30em;
  margin: 0 auto;
  text-wrap: balance;
}
.opener .pov-tag {
  font-family: var(--type-display);
  font-style: italic;
  font-size: 14px;
  color: var(--dim);
  letter-spacing: 0.04em;
}

/* ============================================================
   PER-FORMAT RENDERERS
   ============================================================ */

/* MAINTENANCE LOG ------------------------------------------- */
.fmt-log {
  font-family: var(--type-mono);
  font-size: 14px;
  line-height: 1.7;
  letter-spacing: 0.005em;
}
.fmt-log .log-header {
  border-top: 1px solid color-mix(in oklab, var(--ink) 22%, transparent);
  border-bottom: 1px solid color-mix(in oklab, var(--ink) 22%, transparent);
  padding: 12px 0;
  margin-bottom: 28px;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
  display: grid;
  gap: 4px;
}
.fmt-log .log-entry {
  margin-bottom: 28px;
  padding: 18px 20px;
  background: color-mix(in oklab, var(--ink) 3%, transparent);
  border-left: 2px solid var(--accent);
  position: relative;
}
.fmt-log .log-entry .log-id {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  display: block;
}
.fmt-log .log-entry p { margin: 0 0 0.9em; }
.fmt-log .log-entry p:last-child { margin: 0; }
.fmt-log .transcript {
  font-size: 13px;
  border: 1px dashed color-mix(in oklab, var(--ink) 22%, transparent);
  padding: 12px 14px;
  margin: 12px 0;
}
.fmt-log .transcript .speaker {
  color: var(--accent);
  font-weight: 600;
}

/* JOURNAL PAPER -------------------------------------------- */
.fmt-paper {
  font-family: 'EB Garamond', 'Source Serif 4', Georgia, serif;
  font-size: 16.5px;
  line-height: 1.55;
  font-feature-settings: "kern", "liga", "onum";
  color: var(--ink);
}
.fmt-paper .paper-head {
  text-align: center;
  margin-bottom: 36px;
  padding-bottom: 22px;
  border-bottom: 0.5px solid var(--ink);
}
.fmt-paper .paper-head .pubinfo {
  font-size: 11px;
  letter-spacing: 0.08em;
  font-style: italic;
  color: var(--dim);
  margin-bottom: 18px;
}
.fmt-paper .paper-head .paper-title {
  font-family: 'EB Garamond', serif;
  font-size: 26px;
  font-weight: 500;
  line-height: 1.2;
  margin: 0 0 12px;
  text-wrap: balance;
}
.fmt-paper .section-head {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  margin: 28px 0 12px;
}
.fmt-paper .subsection-head {
  font-style: italic;
  font-size: 14px;
  margin: 20px 0 10px;
}
.fmt-paper .abstract {
  font-size: 14.5px;
  margin: 0 0 24px;
  padding: 14px 16px;
  background: color-mix(in oklab, var(--ink) 4%, transparent);
}
.fmt-paper p { margin: 0 0 0.9em; text-align: justify; hyphens: auto; }
.fmt-paper sup { font-size: 0.7em; vertical-align: super; line-height: 0; }
.fmt-paper .footnote {
  font-size: 12px;
  line-height: 1.5;
  border-top: 0.5px solid color-mix(in oklab, var(--ink) 30%, transparent);
  padding-top: 10px;
  margin-top: 20px;
  color: var(--dim);
}

/* JOURNAL (TOVE) ------------------------------------------- */
.fmt-journal {
  font-family: 'Newsreader', 'Source Serif 4', Georgia, serif;
  font-size: 18px;
  line-height: 1.7;
}
.fmt-journal .journal-head {
  font-style: italic;
  text-align: center;
  color: var(--dim);
  font-size: 13.5px;
  margin-bottom: 32px;
  letter-spacing: 0.02em;
}
.fmt-journal .entry-date {
  font-family: var(--type-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 28px 0 14px;
  border-bottom: 0.5px dashed color-mix(in oklab, var(--accent) 50%, transparent);
  padding-bottom: 8px;
}
.fmt-journal p { margin: 0 0 1em; }

/* DIARY (REEVE) -------------------------------------------- */
.fmt-diary {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  font-weight: 380;
  letter-spacing: -0.005em;
}
.fmt-diary .diary-head {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dim);
  text-align: center;
  margin-bottom: 28px;
  padding: 12px 0;
  border-top: 0.5px solid color-mix(in oklab, var(--ink) 22%, transparent);
  border-bottom: 0.5px solid color-mix(in oklab, var(--ink) 22%, transparent);
  line-height: 1.8;
}
.fmt-diary .day-head {
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 32px 0 14px;
}
.fmt-diary p { margin: 0 0 1em; }

/* PERSONAL LETTER (handwritten) --------------------------- */
.fmt-letter {
  font-family: 'Caveat', 'Kalam', cursive;
  font-size: 24px;
  line-height: 1.55;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.005em;
}
.fmt-letter .letter-head {
  font-style: italic;
  text-align: center;
  font-family: 'Caveat', cursive;
  font-size: 18px;
  color: var(--dim);
  margin-bottom: 28px;
  line-height: 1.5;
}
.fmt-letter p { margin: 0 0 0.7em; text-indent: 0; }
.fmt-letter em { font-style: italic; opacity: 0.92; }
.fmt-letter hr {
  border: 0;
  margin: 1.6em 0;
  text-align: center;
  height: 0.5em;
}
.fmt-letter hr::after {
  content: '~';
  font-family: 'Caveat', cursive;
  font-size: 28px;
  color: var(--dim);
}

/* RECORD (final chapter) ---------------------------------- */
.fmt-record {
  font-family: 'Fraunces', serif;
  font-weight: 300;
  font-size: 28px;
  line-height: 1.4;
  text-align: center;
  font-variation-settings: "opsz" 144, "SOFT" 100;
  text-wrap: balance;
}

/* ============================================================
   TEXTURES — chapter-specific atmospheric layers
   ============================================================ */
.texture-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 1500ms ease;
  z-index: 1;
  mix-blend-mode: screen;
}
.texture-layer.active { opacity: 1; }

/* static-grid (Nera) — faint terminal grid + scanlines */
.tex-static-grid {
  background-image:
    linear-gradient(color-mix(in oklab, var(--accent) 6%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in oklab, var(--accent) 6%, transparent) 1px, transparent 1px);
  background-size: 32px 32px, 32px 32px;
  opacity: 0;
}
.tex-static-grid.active { opacity: 0.5; }

/* twilight-fog (Venn) — bruised drift */
.tex-twilight-fog {
  background:
    radial-gradient(ellipse at 30% 20%, color-mix(in oklab, var(--accent) 30%, transparent) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 70%, color-mix(in oklab, var(--glow) 25%, transparent) 0%, transparent 65%);
  filter: blur(40px);
  mix-blend-mode: normal;
}
.tex-twilight-fog.active { opacity: 0.6; }

/* crt-scan (Unit 7) */
.tex-crt-scan {
  background: repeating-linear-gradient(
    0deg,
    transparent 0,
    transparent 2px,
    color-mix(in oklab, var(--accent) 8%, transparent) 2px,
    color-mix(in oklab, var(--accent) 8%, transparent) 3px
  );
  mix-blend-mode: screen;
}
.tex-crt-scan.active { opacity: 0.4; }

/* paper-warm (Pei/Olenne) */
.tex-paper-warm {
  background:
    radial-gradient(circle at 50% 50%, transparent 0%, color-mix(in oklab, #c47a3a 15%, transparent) 100%);
  mix-blend-mode: multiply;
}
.tex-paper-warm.active { opacity: 0.4; }

/* paper-cool (Symposium) */
.tex-paper-cool { background: radial-gradient(circle at 50% 50%, transparent 60%, color-mix(in oklab, var(--ink) 8%, transparent) 100%); mix-blend-mode: multiply; }
.tex-paper-cool.active { opacity: 0.5; }

/* industrial-light (Maren ch6) */
.tex-industrial-light {
  background: radial-gradient(ellipse at 50% 0%, color-mix(in oklab, var(--accent) 25%, transparent), transparent 70%);
}
.tex-industrial-light.active { opacity: 0.5; }

/* corridor-light */
.tex-corridor-light {
  background: linear-gradient(180deg, color-mix(in oklab, var(--accent) 15%, transparent), transparent 50%, color-mix(in oklab, var(--accent) 8%, transparent));
}
.tex-corridor-light.active { opacity: 0.4; }

/* desk-lamp (Tove) */
.tex-desk-lamp {
  background: radial-gradient(ellipse at 50% 100%, color-mix(in oklab, var(--accent) 30%, transparent), transparent 60%);
}
.tex-desk-lamp.active { opacity: 0.55; }

/* paper-letter (Maren letter) */
.tex-paper-letter {
  background:
    radial-gradient(circle at 30% 40%, color-mix(in oklab, #8a4a3a 12%, transparent), transparent 60%),
    radial-gradient(circle at 80% 80%, color-mix(in oklab, #1f1812 8%, transparent), transparent 60%);
  mix-blend-mode: multiply;
}
.tex-paper-letter.active { opacity: 0.6; }

/* rust-streaks (Callex) */
.tex-rust-streaks {
  background: linear-gradient(180deg, color-mix(in oklab, var(--accent) 25%, transparent) 0%, transparent 30%);
}
.tex-rust-streaks.active { opacity: 0.5; }

/* vacuum-cold (Cade) */
.tex-vacuum-cold {
  background: radial-gradient(circle at 50% 100%, color-mix(in oklab, var(--accent) 18%, transparent), transparent 60%);
}
.tex-vacuum-cold.active { opacity: 0.4; }

/* rain-watermark (Wren) */
.tex-rain-watermark {
  background:
    radial-gradient(ellipse at 70% 20%, color-mix(in oklab, #6a4a2a 20%, transparent), transparent 30%),
    radial-gradient(ellipse at 70% 22%, color-mix(in oklab, #6a4a2a 30%, transparent), transparent 12%);
  mix-blend-mode: multiply;
}
.tex-rain-watermark.active { opacity: 0.5; }

/* circuit-pulse (Seven) */
.tex-circuit-pulse {
  background:
    repeating-linear-gradient(45deg, transparent 0, transparent 80px, color-mix(in oklab, var(--accent) 10%, transparent) 80px, color-mix(in oklab, var(--accent) 10%, transparent) 81px),
    repeating-linear-gradient(-45deg, transparent 0, transparent 80px, color-mix(in oklab, var(--glow) 8%, transparent) 80px, color-mix(in oklab, var(--glow) 8%, transparent) 81px);
}
.tex-circuit-pulse.active { opacity: 0.5; animation: pulseTex 4s ease-in-out infinite; }
@keyframes pulseTex { 50% { opacity: 0.7; } }

/* dust-fall (Davan) */
.tex-dust-fall {
  background: radial-gradient(ellipse at 50% -20%, color-mix(in oklab, var(--ink) 8%, transparent), transparent 50%);
}
.tex-dust-fall.active { opacity: 0.4; }

/* soft-fluorescent (Reeve) */
.tex-soft-fluorescent {
  background: linear-gradient(180deg, color-mix(in oklab, var(--glow) 15%, transparent), transparent 40%);
}
.tex-soft-fluorescent.active { opacity: 0.4; }

/* soft-paper */
.tex-soft-paper { mix-blend-mode: multiply; background: radial-gradient(circle at 50% 50%, transparent 60%, color-mix(in oklab, var(--ink) 8%, transparent)); }
.tex-soft-paper.active { opacity: 0.4; }

/* noise-floor (Rue) */
.tex-noise-floor {
  background: repeating-linear-gradient(0deg, transparent 0, transparent 1px, color-mix(in oklab, var(--accent) 10%, transparent) 1px, color-mix(in oklab, var(--accent) 10%, transparent) 2px);
}
.tex-noise-floor.active { opacity: 0.35; animation: noiseSlide 30s linear infinite; }
@keyframes noiseSlide { from { background-position: 0 0; } to { background-position: 0 100px; } }

/* amber-light (Convergence) */
.tex-amber-light {
  background:
    radial-gradient(ellipse at 50% 100%, color-mix(in oklab, var(--accent) 35%, transparent), transparent 60%),
    radial-gradient(ellipse at 20% 30%, color-mix(in oklab, var(--accent) 18%, transparent), transparent 40%);
}
.tex-amber-light.active { opacity: 0.55; }

/* home-warmth (Maren ch20) */
.tex-home-warmth {
  background: radial-gradient(ellipse at 50% 30%, color-mix(in oklab, var(--accent) 18%, transparent), transparent 60%);
}
.tex-home-warmth.active { opacity: 0.45; }

/* morning-light (Eli) */
.tex-morning-light {
  background:
    radial-gradient(ellipse at 80% 0%, color-mix(in oklab, var(--accent) 35%, transparent), transparent 60%),
    radial-gradient(ellipse at 20% 100%, color-mix(in oklab, var(--glow) 20%, transparent), transparent 50%);
}
.tex-morning-light.active { opacity: 0.55; }

/* pure-dark (Record) — nothing */

/* ============================================================
   SIGNAL — the persistent waveform progress bar
   ============================================================ */
.signal-strip {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 28px 18px;
  z-index: 50;
  user-select: none;
}
.signal-canvas-wrap {
  flex: 1;
  height: 28px;
  position: relative;
  cursor: pointer;
}
.signal-canvas-wrap canvas { width: 100%; height: 100%; display: block; }
.signal-progress {
  position: absolute;
  top: 0; bottom: 0; left: 0;
  width: 0%;
  background: color-mix(in oklab, var(--accent) 18%, transparent);
  border-right: 1px solid color-mix(in oklab, var(--accent) 60%, transparent);
  pointer-events: none;
}
.signal-meta {
  font-family: var(--type-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dim);
  display: flex;
  gap: 14px;
  white-space: nowrap;
}
.signal-meta .pages { color: var(--ink); opacity: 0.7; }
.signal-meta .freq { opacity: 0.6; }

/* nav buttons in chrome bottom */
.nav-btns {
  display: flex;
  gap: 8px;
  align-items: center;
}
.nav-btn {
  display: grid; place-items: center;
  width: 38px; height: 38px;
  border-radius: 999px;
  color: var(--dim);
  transition: color 200ms, background 200ms, transform 200ms;
}
.nav-btn:hover { color: var(--ink); background: color-mix(in oklab, var(--ink) 7%, transparent); }
.nav-btn:active { transform: scale(0.95); }
.nav-btn:disabled { opacity: 0.2; cursor: not-allowed; }
.nav-btn svg { width: 16px; height: 16px; stroke: currentColor; stroke-width: 1.5; fill: none; }

/* ============================================================
   TOC DRAWER
   ============================================================ */
.scrim {
  position: fixed; inset: 0;
  background: color-mix(in oklab, var(--bg) 75%, #000 25%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 350ms ease;
  z-index: 100;
  backdrop-filter: blur(6px);
}
.scrim.open { opacity: 1; pointer-events: auto; }

.drawer {
  position: fixed;
  top: 0; bottom: 0; left: 0;
  width: min(440px, 92vw);
  background: var(--bg);
  border-right: 0.5px solid color-mix(in oklab, var(--ink) 14%, transparent);
  z-index: 110;
  transform: translateX(-100%);
  transition: transform 450ms cubic-bezier(.3,.7,.2,1);
  display: flex; flex-direction: column;
  overflow: hidden;
}
.drawer.open { transform: translateX(0); }

.drawer-head {
  padding: 22px 24px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.drawer-head .label {
  font-family: var(--type-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--dim);
}
.drawer-head h1 {
  font-family: var(--type-display);
  font-weight: 300;
  font-style: italic;
  font-size: 28px;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink);
}
.drawer-head h1 .author {
  font-style: normal;
  display: block;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  margin-top: 4px;
}

.toc {
  flex: 1;
  overflow-y: auto;
  padding: 12px 12px 24px;
}
.toc::-webkit-scrollbar { width: 6px; }
.toc::-webkit-scrollbar-thumb { background: color-mix(in oklab, var(--ink) 18%, transparent); border-radius: 3px; }

.toc-item {
  width: 100%;
  text-align: left;
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  padding: 14px 14px;
  border-radius: 8px;
  color: var(--ink);
  position: relative;
  transition: background 200ms;
}
.toc-item:hover { background: color-mix(in oklab, var(--ink) 6%, transparent); }
.toc-item.current {
  background: color-mix(in oklab, var(--accent) 14%, transparent);
}
.toc-item .num {
  font-family: var(--type-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--dim);
  padding-top: 4px;
}
.toc-item.current .num { color: var(--accent); }
.toc-item .title-line {
  font-family: var(--type-display);
  font-weight: 350;
  font-size: 17px;
  line-height: 1.25;
  letter-spacing: -0.005em;
}
.toc-item .meta-line {
  font-family: var(--type-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  margin-top: 4px;
}
.toc-item .read-bar {
  grid-column: 2;
  margin-top: 8px;
  height: 2px;
  background: color-mix(in oklab, var(--ink) 10%, transparent);
  border-radius: 1px;
  overflow: hidden;
}
.toc-item .read-bar-fill {
  height: 100%;
  background: var(--accent);
  width: 0;
  transition: width 600ms ease;
}

.drawer-foot {
  padding: 16px 24px 20px;
  border-top: 0.5px solid color-mix(in oklab, var(--ink) 14%, transparent);
  font-family: var(--type-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  display: flex;
  justify-content: space-between;
}

/* ============================================================
   SETTINGS PANEL
   ============================================================ */
.settings {
  position: fixed;
  top: 70px; right: 22px;
  width: 280px;
  background: var(--bg);
  border: 0.5px solid color-mix(in oklab, var(--ink) 18%, transparent);
  border-radius: 14px;
  padding: 18px 20px;
  z-index: 105;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity 220ms, transform 220ms;
  box-shadow: 0 24px 48px -16px rgba(0,0,0,0.5);
}
.settings.open { opacity: 1; pointer-events: auto; transform: none; }
.settings .row {
  display: grid; gap: 8px;
  padding: 10px 0;
  border-bottom: 0.5px solid color-mix(in oklab, var(--ink) 10%, transparent);
}
.settings .row:last-child { border-bottom: 0; }
.settings .row label {
  font-family: var(--type-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dim);
  display: flex;
  justify-content: space-between;
}
.settings .row label .v { color: var(--ink); }
.settings .row .options {
  display: flex; gap: 6px;
}
.settings .row .options button {
  flex: 1;
  padding: 8px 6px;
  border-radius: 8px;
  font-family: var(--type-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  background: color-mix(in oklab, var(--ink) 5%, transparent);
  color: var(--ink);
  transition: all 200ms;
}
.settings .row .options button:hover { background: color-mix(in oklab, var(--ink) 10%, transparent); }
.settings .row .options button.on {
  background: var(--accent);
  color: var(--bg);
}
.settings .row input[type=range] {
  width: 100%;
  accent-color: var(--accent);
}

.settings .toggle {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.settings .toggle .switch {
  width: 36px; height: 20px;
  border-radius: 999px;
  background: color-mix(in oklab, var(--ink) 14%, transparent);
  position: relative;
  transition: background 200ms;
}
.settings .toggle .switch::after {
  content:'';
  position: absolute;
  top: 2px; left: 2px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--ink);
  transition: transform 200ms;
}
.settings .toggle.on .switch { background: var(--accent); }
.settings .toggle.on .switch::after { transform: translateX(16px); background: var(--bg); }

/* ============================================================
   FOOTNOTE / GLOSSARY POPOVER
   ============================================================ */
.glossary-mark {
  cursor: pointer;
  border-bottom: 1px dotted color-mix(in oklab, var(--accent) 60%, transparent);
  color: var(--accent);
  transition: background 200ms;
}
.glossary-mark:hover { background: color-mix(in oklab, var(--accent) 10%, transparent); }

.popover {
  position: fixed;
  max-width: 320px;
  background: var(--bg);
  border: 0.5px solid color-mix(in oklab, var(--ink) 22%, transparent);
  border-radius: 10px;
  padding: 14px 16px;
  box-shadow: 0 12px 24px -8px rgba(0,0,0,0.5);
  z-index: 200;
  font-size: 13px;
  line-height: 1.55;
  font-family: var(--type-body);
  color: var(--ink);
}
.popover .pop-label {
  font-family: var(--type-mono);
  font-size: 9.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}
.popover .pop-title {
  font-family: var(--type-display);
  font-style: italic;
  font-size: 16px;
  margin-bottom: 4px;
}

/* ============================================================
   COVER (intro screen)
   ============================================================ */
.cover {
  position: fixed; inset: 0;
  height: 100vh;
  height: 100dvh;
  display: grid;
  place-items: center;
  background: var(--bg);
  z-index: 90;
  transition: opacity 700ms ease;
}
.cover.gone { opacity: 0; pointer-events: none; }
.cover-inner {
  text-align: center;
  display: grid;
  gap: 36px;
  padding: 0 24px;
  max-width: 640px;
}
.cover .pre {
  font-family: var(--type-mono);
  font-size: 10.5px;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--dim);
}
.cover h1 {
  font-family: var(--type-display);
  font-weight: 300;
  font-style: italic;
  font-size: clamp(54px, 12vw, 140px);
  line-height: 0.95;
  margin: 0;
  letter-spacing: -0.025em;
  color: var(--ink);
  font-variation-settings: "opsz" 144, "SOFT" 100;
}
.cover .by {
  font-family: var(--type-display);
  font-size: 14px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dim);
  font-style: normal;
}
.cover .enter {
  font-family: var(--type-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 12px 22px;
  border: 0.5px solid color-mix(in oklab, var(--accent) 60%, transparent);
  border-radius: 999px;
  justify-self: center;
  transition: all 200ms;
}
.cover .enter:hover { background: var(--accent); color: var(--bg); }
.cover .resume {
  font-family: var(--type-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
}
.cover .resume button { color: var(--ink); border-bottom: 1px dotted var(--ink); }

.cover .signal-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.15;
}

/* ============================================================
   responsive
   ============================================================ */
@media (max-width: 720px) {
  :root { --reading-size: 17px; --reading-line: 1.6; }

  /* Top chrome — compact, larger taps */
  .chrome-top { padding: 10px 14px; gap: 8px; }
  .brand { font-size: 13px; gap: 6px; }
  .brand .author { display: none; }
  .brand .title-mark { font-size: 14px; }
  .chapter-meta .ch-title { display: none; }
  .chapter-meta .ch-num { font-size: 9.5px; letter-spacing: 0.18em; }
  .chrome-tools { gap: 2px; }
  .tool-btn { width: 44px; height: 44px; }
  .tool-btn svg { width: 18px; height: 18px; }

  /* Reading surface — give it room */
  .page-wrap { padding: 0 18px; }
  .page { padding: 4px 0; }

  /* Bottom signal strip — drop the freq label which forces overflow */
  .signal-strip { padding: 8px 14px 12px; gap: 10px; }
  .signal-meta { font-size: 9px; gap: 8px; }
  .signal-meta .freq { display: none; }
  .signal-canvas-wrap { height: 22px; }
  .nav-btn { width: 44px; height: 44px; }
  .nav-btn svg { width: 18px; height: 18px; }
  .nav-btns { gap: 4px; }

  /* Settings panel — never overflow viewport */
  .settings { top: 56px; right: 12px; left: 12px; width: auto; max-width: 320px; margin-left: auto; padding: 14px 16px; }
  .settings .row .options button { padding: 10px 6px; min-height: 40px; }

  /* Drawer — full bleed */
  .drawer { width: min(420px, 100vw); }
  .drawer-head { padding: 18px 18px 12px; }
  .drawer-head h1 { font-size: 24px; }
  .toc-item { padding: 12px 12px; }
  .toc-item .title-line { font-size: 16px; }

  /* Cover — fit small phones */
  .cover-inner { gap: 28px; padding: 0 20px; }
  .cover h1 { font-size: clamp(48px, 14vw, 96px); }
  .cover .pre { font-size: 9.5px; letter-spacing: 0.32em; }
  .cover .by { font-size: 12px; letter-spacing: 0.18em; }
  .cover .enter { padding: 14px 26px; min-height: 44px; font-size: 11px; }

  /* Chapter opener + format-specific sizing */
  .opener { gap: 18px; padding: 0 4px; }
  .opener .title { font-size: clamp(32px, 8vw, 44px); }
  .opener .epigraph { font-size: 10.5px; letter-spacing: 0.16em; }
  .fmt-letter { font-size: 20px; line-height: 1.5; }
  .fmt-record { font-size: 22px; line-height: 1.4; }
  .fmt-paper { font-size: 15.5px; }
  .fmt-paper .paper-head .paper-title { font-size: 22px; }
  .fmt-journal { font-size: 17px; }
  .fmt-diary { font-size: 15.5px; }
  .fmt-log { font-size: 13px; }
  .fmt-log .log-entry { padding: 14px 16px; }

  /* Disable text-selection during taps (avoid accidental selection on swipe) */
  .page-content { -webkit-user-select: none; user-select: none; }
  .page-content p, .page-content .glossary-mark { -webkit-user-select: text; user-select: text; }
}

/* Very small phones (iPhone SE etc) */
@media (max-width: 380px) {
  :root { --reading-size: 16.5px; }
  .chrome-top { padding: 8px 10px; }
  .brand .title-mark { font-size: 13px; }
  .signal-strip { padding: 6px 10px 10px; }
  .page-wrap { padding: 0 14px; }
  .opener .title { font-size: 30px; }
}