:root {
  --ink: #ece8e1;
  --dim: #9aa1ad;
  --bg: #0d0f14;
  --panel: #161922;
  --line: #262b36;
  --warm: #e0a866;
  --live: #6fd3a8;
  --bad: #ff8f7a;
  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* The paper */
  --paper: #f7f1e3;
  --paper-low: #ece2cd;
  --paper-ink: #221f1a;
  --paper-soft: #7c7161;
  --paper-rule: #d8cdb4;
  --nib: #1f3f66;

  /* One page turn, and the size of the printed page */
  --turn-ms: 620ms;
  --page-font: clamp(13px, 1.17vw, 17px);
  --page-h: clamp(360px, calc(100vh - 236px), 780px);
}
* { box-sizing: border-box; }
/* A class with a display rule would otherwise beat the hidden attribute. */
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
}
a { color: var(--warm); }

/* ------------------------------------------------------------- the top bar */

.bar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  padding: 8px 18px;
  background: rgba(13, 15, 20, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.home {
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink);
}
.home::before { content: "\25A0"; color: var(--warm); margin-right: 7px; }
.crumb {
  color: var(--dim);
  font-family: var(--serif);
  font-size: 15px;
  max-width: 26vw;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.stats {
  display: flex;
  gap: clamp(14px, 2.4vw, 34px);
  margin-left: auto;
  font-variant-numeric: tabular-nums;
}
.stat { display: flex; flex-direction: column; line-height: 1.1; }
.stat b {
  font-size: clamp(19px, 2.1vw, 30px);
  font-weight: 600;
  white-space: nowrap;
}
.stat i {
  font-style: normal;
  font-size: 10px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--dim);
  margin-top: 3px;
}
.stat.rate b { color: var(--live); }
.ghost, .stop {
  font: inherit;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
}
.stop { border-color: #5a2b2b; color: var(--bad); }
.stop:hover { background: #2a1616; }
.ghost:hover { background: var(--panel); }

/* ------------------------------------------------------- the page around it */

.sheet {
  max-width: 76rem;
  margin: 0 auto;
  padding: 14px 16px 80px;
}
.setup, .status, .error {
  max-width: 46rem;
  margin-left: auto;
  margin-right: auto;
}
h1 { font-size: 1.6rem; line-height: 1.25; margin: 0 0 8px; }
.setup {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  margin-top: 8px;
}
.idea, .facts { color: var(--dim); font-size: 14px; }
label { display: block; font-size: 13px; color: var(--dim); margin: 12px 0 4px; }
textarea, input, select {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: #0f1219;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
}
textarea { resize: vertical; min-height: 78px; }
textarea:focus, input:focus, select:focus { outline: 2px solid var(--warm); outline-offset: 1px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.field { flex: 1 1 14rem; }
.field.narrow { flex: 0 0 7rem; }
.go {
  font: inherit;
  font-weight: 600;
  margin-top: 16px;
  width: 100%;
  padding: 12px 16px;
  border: 0;
  border-radius: 8px;
  background: var(--warm);
  color: #1a1206;
  cursor: pointer;
}
.go:disabled { opacity: 0.5; cursor: default; }

.status { margin: 10px auto 6px; font-size: 14px; color: var(--dim); text-align: center; }
.status::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--live);
  animation: pulse 1.1s infinite ease-in-out;
}
@keyframes pulse { 0%, 100% { opacity: 0.25; } 50% { opacity: 1; } }
.status.still::before { animation: none; background: var(--dim); }

.error {
  margin: 16px auto;
  padding: 12px 14px;
  border: 1px solid #5a2b2b;
  border-left-width: 4px;
  border-radius: 8px;
  background: #1c1416;
  color: var(--bad);
  font-size: 14px;
}
.error pre {
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--dim);
  font-size: 12px;
  margin: 8px 0 0;
}
.notice {
  margin: 12px 0 0;
  padding: 10px 12px;
  border-radius: 8px;
  background: #241d12;
  color: var(--warm);
  font-size: 13px;
}

.outline { margin: 0; font-size: 13px; max-width: 42rem; }
.outline summary { cursor: pointer; color: var(--dim); }
.outline ol { margin: 10px 0 0; padding-left: 22px; color: var(--dim); }
.outline li { margin-bottom: 6px; }
.outline b { color: var(--ink); font-weight: 600; }

/* The run is over and the book stays open, so this is a strip under it, not a panel. */
.finish {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px 11px;
  max-width: 74rem;
  margin: 8px auto 0;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}
.finish h2 { margin: 0; font-size: 1rem; }
.finish .facts { margin: 0; }
.share {
  padding: 6px 11px;
  border-radius: 7px;
  background: #0f1219;
  border: 1px solid var(--line);
  word-break: break-all;
  font-size: 13px;
  text-decoration: none;
}
.again {
  font: inherit;
  font-size: 13px;
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.again:hover { background: #202533; }

/* ------------------------------------------------------------- the open book */

.desk {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) 46px;
  grid-template-rows: auto auto;
  align-items: center;
  gap: 6px 10px;
  max-width: 74rem;
  margin: 6px auto 0;
  overflow-x: clip;
}
.book {
  --fit: 1;
  position: relative;
  grid-column: 2;
  grid-row: 1;
  display: flex;
  width: 100%;
  height: var(--page-h);
  perspective: 2600px;
  perspective-origin: 50% 42%;
}
.leaf { position: relative; width: 50%; height: 100%; }
.gutter {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 26px;
  margin-left: -13px;
  z-index: 3;
  pointer-events: none;
  background: linear-gradient(
    to right,
    rgba(58, 42, 22, 0) 0%,
    rgba(58, 42, 22, 0.26) 42%,
    rgba(30, 20, 10, 0.4) 50%,
    rgba(58, 42, 22, 0.26) 58%,
    rgba(58, 42, 22, 0) 100%
  );
}

.paper {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: clamp(16px, 2.6vh, 30px) clamp(18px, 2.4vw, 44px) clamp(10px, 1.6vh, 18px);
  background: linear-gradient(160deg, var(--paper) 0%, var(--paper) 62%, var(--paper-low) 100%);
  color: var(--paper-ink);
  font-family: var(--serif);
  font-size: calc(var(--page-font) * var(--fit));
  line-height: 1.6;
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}
.side-left .paper { border-radius: 7px 2px 2px 7px; }
.side-right .paper { border-radius: 2px 7px 7px 2px; }
/* The edge of the pile of sheets under the one on show. */
.side-left::before, .side-right::before {
  content: "";
  position: absolute;
  top: 7px;
  bottom: 7px;
  width: 7px;
  z-index: -1;
}
.side-left::before {
  left: -7px;
  border-radius: 4px 0 0 4px;
  background: repeating-linear-gradient(to right, #cfc3a8 0 1px, #efe6d2 1px 2px);
}
.side-right::before {
  right: -7px;
  border-radius: 0 4px 4px 0;
  background: repeating-linear-gradient(to right, #efe6d2 0 1px, #cfc3a8 1px 2px);
}
.leaf.empty::before { display: none; }

.runhead {
  flex: 0 0 auto;
  font-size: 0.66em;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper-soft);
  border-bottom: 1px solid var(--paper-rule);
  padding-bottom: 6px;
  margin-bottom: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.text {
  flex: 1 1 auto;
  overflow-y: auto;
  scrollbar-width: none;
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
}
.text::-webkit-scrollbar { width: 0; height: 0; }
.text p { margin: 0; }
.text p + p { text-indent: 1.4em; }
.opener { margin: 0.2em 0 1.1em; text-align: center; }
.chapter-no {
  display: block;
  font-size: 0.72em;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper-soft);
}
.chapter-name {
  display: block;
  margin-top: 0.3em;
  font-size: 1.28em;
  font-style: italic;
}
.folio {
  flex: 0 0 auto;
  margin-top: 10px;
  padding-top: 6px;
  border-top: 1px solid var(--paper-rule);
  text-align: center;
  font-size: 0.72em;
  letter-spacing: 0.1em;
  color: var(--paper-soft);
}
/* A page with more text than the paper holds scrolls, and says so. */
.paper.more::after {
  content: "";
  position: absolute;
  left: 8%;
  right: 8%;
  bottom: 2.7em;
  height: 2.2em;
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(247, 241, 227, 0), var(--paper));
}
.folio .cut { margin-left: 1em; color: #8a5a22; }
.caret {
  display: inline-block;
  width: 2px;
  height: 0.95em;
  margin-left: 1.5px;
  vertical-align: -0.14em;
  background: var(--nib);
  animation: blink 1.05s steps(1) infinite;
}
@keyframes blink { 0%, 62% { opacity: 1; } 63%, 100% { opacity: 0.12; } }

.title-page { justify-content: center; text-align: center; }
.title-block { margin: auto; padding: 0 6%; }
.title-block h2 {
  margin: 0;
  font-size: 2em;
  font-weight: 400;
  line-height: 1.22;
}
.title-block .rule {
  width: 58px;
  height: 1px;
  margin: 1.1em auto;
  background: var(--paper-rule);
}
.title-idea { margin: 0; font-style: italic; font-size: 0.96em; color: #4a443a; }
.imprint {
  margin: 1.6em 0 0;
  font-size: 0.7em;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-soft);
}

/* ------------------------------------------------------------ the page turn */

.turner {
  position: absolute;
  top: 0;
  height: 100%;
  z-index: 6;
  transform-style: preserve-3d;
  pointer-events: none;
}
.turner .face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.turner .face.back { transform: rotateY(180deg); }
.turner .paper { border-radius: 4px; box-shadow: 0 16px 38px rgba(0, 0, 0, 0.45); }
.turner .face::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 4px;
  opacity: 0;
  pointer-events: none;
}
.turner .front::after {
  background: linear-gradient(to right, rgba(20, 12, 4, 0.42), rgba(20, 12, 4, 0) 45%, rgba(255, 248, 232, 0.5));
}
.turner .back::after {
  background: linear-gradient(to left, rgba(20, 12, 4, 0.42), rgba(20, 12, 4, 0) 45%, rgba(255, 248, 232, 0.5));
}
.book.turn-fwd .turner,
.book.turn-back .turner {
  animation-duration: var(--turn-ms);
  animation-timing-function: cubic-bezier(0.36, 0.06, 0.28, 1);
  animation-fill-mode: forwards;
}
/* The leaf is put in place and painted before it starts to move, so its text is
   measured against the same page size it will be read at. */
.turner.at-right { left: 50%; width: 50%; transform-origin: left center; }
.turner.at-left { left: 0; width: 50%; transform-origin: right center; }
.book.turn-fwd .turner { animation-name: leaf-forward; }
.book.turn-back .turner { animation-name: leaf-backward; }
@keyframes leaf-forward { from { transform: rotateY(0deg); } to { transform: rotateY(-180deg); } }
@keyframes leaf-backward { from { transform: rotateY(0deg); } to { transform: rotateY(180deg); } }
@keyframes leaf-backward-single { from { transform: rotateY(-180deg); } to { transform: rotateY(0deg); } }
.book.turn-fwd .face::after,
.book.turn-back .face::after {
  animation: sheen var(--turn-ms) ease-in-out forwards;
}
@keyframes sheen { 0% { opacity: 0; } 46% { opacity: 0.9; } 100% { opacity: 0; } }

/* The shadow the turning leaf throws on the page it is sweeping over. */
.cast {
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 4;
  opacity: 0;
  pointer-events: none;
  border-radius: 6px;
}
.book.turn-fwd .cast {
  left: 0;
  width: 50%;
  background: linear-gradient(to left, rgba(0, 0, 0, 0.62), rgba(0, 0, 0, 0));
  animation: cast-in var(--turn-ms) ease-in forwards;
}
.book.turn-back .cast {
  right: 0;
  width: 50%;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.62), rgba(0, 0, 0, 0));
  animation: cast-in var(--turn-ms) ease-in forwards;
}
@keyframes cast-in { 0% { opacity: 0; } 55% { opacity: 0.85; } 100% { opacity: 0; } }

/* --------------------------------------------------------- reading it back */

.arrow {
  grid-row: 1;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  justify-self: center;
}
.arrow:hover:not(:disabled) { background: #202533; border-color: #3a4152; }
.arrow:disabled { opacity: 0.22; cursor: default; }
.arrow.prev { grid-column: 1; }
.arrow.next { grid-column: 3; }
.bookbar {
  grid-column: 1 / -1;
  grid-row: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
  min-height: 34px;
  font-size: 13px;
  color: var(--dim);
}
.where { font-variant-numeric: tabular-nums; }
.tolive {
  font: inherit;
  font-size: 13px;
  padding: 5px 13px;
  border-radius: 999px;
  border: 1px solid #2f5a48;
  background: #12251e;
  color: var(--live);
  cursor: pointer;
}
.tolive:hover { background: #17332a; }

/* ------------------------------------------- the saved book and the shelf */

body.reader .sheet { max-width: 50rem; }
.reader h1 { font-family: var(--serif); font-size: 2rem; font-weight: 400; margin-top: 18px; }
.reader .facts { margin: 10px 0 0; }
.reader .idea { font-style: italic; }
.toc { margin: 22px 0; }
.toc h2 { font-size: 1rem; color: var(--dim); margin: 0 0 8px; }
.toc ol, .booklist { padding-left: 20px; }
.toc li, .booklist li { margin-bottom: 8px; }
.toc a, .booklist a { text-decoration: none; }
.toc a:hover, .booklist a:hover { text-decoration: underline; }
.range { display: block; font-size: 12px; color: var(--dim); }
.booklist { list-style: none; padding: 0; }
.booklist li { padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.end { margin-top: 32px; font-size: 14px; }

.reader .chapter {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--warm);
  margin: 34px 0 12px;
  letter-spacing: 0.02em;
}
.reader .page {
  position: relative;
  margin: 0 0 18px;
  padding: 30px clamp(20px, 5vw, 52px) 34px;
  border-radius: 4px;
  background: linear-gradient(160deg, var(--paper) 0%, var(--paper) 64%, var(--paper-low) 100%);
  color: var(--paper-ink);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.45);
  font-family: var(--serif);
  font-size: 1.02rem;
  line-height: 1.68;
  text-align: justify;
  hyphens: auto;
}
.reader .page p { margin: 0; }
.reader .page p + p { text-indent: 1.4em; }
.reader .page-no {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 10px;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--paper-soft);
}
.reader .page-no a { color: var(--paper-soft); text-decoration: none; }

/* ------------------------------------------------------------ small screens */

@media (max-width: 860px) {
  :root { --page-font: clamp(13px, 3.6vw, 16px); --page-h: clamp(340px, calc(100vh - 252px), 820px); }
  .sheet { padding: 10px 12px 72px; }
  /* One page, the full width of the phone, and the arrows drop under it. */
  .desk { grid-template-columns: minmax(0, 1fr); }
  .book { grid-column: 1; }
  .arrow.prev, .arrow.next { grid-row: 2; grid-column: 1; align-self: start; }
  .arrow.prev { justify-self: start; }
  .arrow.next { justify-self: end; }
  .bookbar { grid-row: 2; grid-column: 1; padding: 0 46px; }
  .side-left { display: none; }
  .side-right { width: 100%; }
  .gutter { display: none; }
  .turner.at-right, .turner.at-left { left: 0; width: 100%; transform-origin: left center; }
  .book.turn-back .turner { animation-name: leaf-backward-single; }
  .book.turn-fwd .cast, .book.turn-back .cast { left: 0; right: auto; width: 100%; }
  .side-right .paper { border-radius: 4px; }
  .arrow { width: 36px; height: 36px; font-size: 20px; }
}

@media (max-width: 560px) {
  .bar { gap: 6px 12px; padding: 7px 12px; }
  .crumb { max-width: 100%; order: 3; flex-basis: 100%; font-size: 14px; }
  .stats { order: 4; flex-basis: 100%; margin-left: 0; justify-content: space-between; }
  .stat b { font-size: 21px; }
  h1 { font-size: 1.35rem; }
}

@media (prefers-reduced-motion: reduce) {
  :root { --turn-ms: 1ms; }
  .caret, .status::before { animation: none; }
}