/* —————————————————————————————————— Reader */

#reader {
  position: fixed; inset: 0; z-index: 20;
  --paper: #f8f3e6; --paper-2: #f2ebd9; --ink: #292118; --ink-soft: #6d6252;
  --folio: #8a7d68; --head: #7c6f5c; --gutter: rgba(60,45,25,.16);
  --fs: 19px; --lh: 1.54;
  --pw: 430px; --ph: 620px;
}
#reader[data-theme="sepia"] {
  --paper: #f2e4c9; --paper-2: #ecdcbd; --ink: #3f3327; --ink-soft: #7d6c58;
  --folio: #93805f; --head: #857252; --gutter: rgba(66,48,22,.18);
}
#reader[data-theme="dark"] {
  --paper: #201d19; --paper-2: #1b1815; --ink: #d8cdb9; --ink-soft: #9a8f7d;
  --folio: #7e7361; --head: #857a66; --gutter: rgba(0,0,0,.5);
}

#reader .reader-scrim {
  position: absolute; inset: 0;
  background: radial-gradient(130% 120% at 50% 40%, rgba(22,16,11,.88), rgba(9,6,4,.96));
  opacity: 0; transition: opacity .5s var(--ease-out);
}
#reader.on .reader-scrim { opacity: 1; }

/* ————— book stage & flight ————— */

.book-stage {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  perspective: 2200px;
}

.book {
  position: relative;
  width: calc(var(--pw) * 2); height: var(--ph);
  transform: var(--fly, translate3d(0, 4vh, 0) scale(.2));
  transform-style: preserve-3d;
  transition: none;
}

/* open spread */
.spread {
  position: absolute; inset: 0;
  display: grid; grid-template-columns: 1fr 26px 1fr;
  opacity: 0; transition: opacity .18s linear;
}
.book[data-phase="open"] .spread { opacity: 1; }
.book[data-phase="open"] .spread .sheet { pointer-events: auto; }

.sheet { position: relative; opacity: 0; transition: opacity .5s var(--ease-out) .1s; }
.book[data-phase="open"] .sheet { opacity: 1; }
.sheet.left { transform-origin: right center; }
.sheet.right { transform-origin: left center; }

.paper {
  position: absolute; inset: 0; overflow: hidden; border-radius: 3px;
  background:
    linear-gradient(180deg, var(--paper), var(--paper-2) 82%, var(--paper));
  box-shadow: 0 1px 0 rgba(255,255,255,.35) inset, 0 24px 70px rgba(0,0,0,.5);
}
#reader[data-theme="dark"] .paper {
  box-shadow: 0 0 0 rgba(255,255,255,0) inset, 0 24px 70px rgba(0,0,0,.65);
}
.sheet.left .paper { box-shadow: 0 1px 0 rgba(255,255,255,.3) inset, 8px 18px 50px rgba(0,0,0,.42); }

/* gutter shading */
.sheet.left .paper::after {
  content: ""; position: absolute; top: 0; bottom: 0; right: 0; width: 34px;
  background: linear-gradient(90deg, transparent, var(--gutter));
  pointer-events: none;
}
.sheet.right .paper::after {
  content: ""; position: absolute; top: 0; bottom: 0; left: 0; width: 34px;
  background: linear-gradient(270deg, transparent, var(--gutter));
  pointer-events: none;
}
.sheet .paper::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .05 0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

.spine-gutter {
  background: linear-gradient(90deg, var(--paper-2), var(--paper) 14%, var(--paper) 86%, var(--paper-2));
  box-shadow: inset 0 0 14px rgba(0,0,0,.22);
  border-radius: 1px;
  opacity: 0; transition: opacity .5s var(--ease-out) .1s;
}
.book[data-phase="open"] .spine-gutter { opacity: 1; }

/* running head + folio */
.running-head {
  position: absolute; top: 4.6%; left: 9%; right: 9%;
  font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--head); text-align: center; white-space: nowrap; overflow: hidden;
  font-variant: normal;
}
.running-head::after {
  content: ""; display: block; margin: 5px auto 0; width: 44px; height: 1px;
  background: currentColor; opacity: .5;
}
.folio {
  position: absolute; bottom: 3.8%; left: 0; right: 0; text-align: center;
  font-size: 12px; color: var(--folio); font-variant: oldstyle-nums;
}

/* flow (paginated text) */
.flow-wrap { position: absolute; top: 9.2%; bottom: 7.4%; left: 8.5%; right: 8.5%; overflow: hidden; }
.flow {
  height: 100%;
  column-fill: auto;
  column-gap: 96px;
  column-width: var(--cw, 340px);
  will-change: transform;
}
.flow > * { break-inside: auto; }
.flow .chap-head {
  font-weight: 500; font-size: calc(var(--fs) * 1.5); line-height: 1.2;
  text-align: center; letter-spacing: .02em;
  margin: calc(var(--fs) * 1.5) auto calc(var(--fs) * 1.1);
  max-width: 82%;
  color: var(--ink);
}
.flow .chap-head .chap-rule { display: block; width: 54px; height: 1px; background: var(--head); margin: 12px auto 0; opacity: .6; }
.flow p {
  font-size: var(--fs); line-height: var(--lh);
  text-align: justify; hyphens: auto; -webkit-hyphens: auto;
  color: var(--ink);
  margin: 0 0 calc(var(--fs) * .72);
  text-indent: calc(var(--fs) * 1.35);
  orphans: 2; widows: 2;
}
.flow p.lead { text-indent: 0; }
.flow p.lead::first-letter {
  float: left; font-size: calc(var(--fs) * 3.1); line-height: .82;
  padding: calc(var(--fs) * .1) calc(var(--fs) * .12) 0 0;
  color: var(--ink); font-weight: 500;
}
.flow p.verse, .flow div.verse {
  white-space: pre-line; text-align: left; text-indent: 0;
  font-style: italic; color: color-mix(in srgb, var(--ink) 88%, var(--ink-soft));
}
.flow p.note {
  font-size: calc(var(--fs) * .82); line-height: 1.45; color: var(--ink-soft);
  padding-left: calc(var(--fs) * .8); text-indent: 0;
  border-left: 1px solid color-mix(in srgb, var(--head) 40%, transparent);
}
.flow .titlepage {
  height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; gap: calc(var(--fs) * .5);
}
.flow .titlepage .tp-rule { width: 60px; height: 1px; background: var(--head); margin: 10px 0; opacity: .6; }
.flow .titlepage .tp-title { font-size: calc(var(--fs) * 1.9); line-height: 1.18; max-width: 84%; }
.flow .titlepage .tp-author { font-size: calc(var(--fs) * 1.15); letter-spacing: .14em; text-transform: uppercase; }
.flow .titlepage .tp-meta { font-style: italic; font-size: calc(var(--fs) * .92); color: var(--ink-soft); line-height: 1.6; }

/* ————— covers & closed book ————— */

.cover {
  position: absolute; top: 0; bottom: 0; width: 50%;
  backface-visibility: hidden;
  border-radius: 3px 0 0 3px;
  background: #2a1c12;
  transition: opacity .3s;
}
.cover.front {
  left: 0; transform-origin: left center;
  transform: rotateY(0deg);
  z-index: 6; overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.25), 6px 10px 34px rgba(0,0,0,.5);
}
.cover.front img.cover-art { width: 100%; height: 100%; object-fit: cover; display: block; }
.cover.front .cover-gloss {
  position: absolute; inset: 0;
  background: linear-gradient(115deg, rgba(255,255,255,.13), transparent 38%);
}
.cover.back { right: 0; transform: rotateY(0deg); z-index: 1; border-radius: 0 3px 3px 0; }
.book[data-phase="closed"] .cover.front { transform: rotateY(-6deg); }
.book[data-phase="open"] .cover.front { transform: rotateY(-164deg); }
.book[data-phase="closed"] .cover.back { transform: rotateY(6deg); }
.book[data-phase="open"] .cover.back { transform: rotateY(164deg); }
.book[data-phase="closed"] .page-block { opacity: 1; }
.page-block {
  position: absolute; top: 1.2%; bottom: 1.2%; left: 50%; right: 0;
  opacity: 0; z-index: 2; transition: opacity .25s;
  background:
    repeating-linear-gradient(90deg, #ded0ac 0 1px, #cbbd97 1px 3px);
  border-radius: 0 2px 2px 0;
  box-shadow: inset -3px 0 6px rgba(0,0,0,.35);
}
.page-block i { position: absolute; background: rgba(120,100,70,.35); height: 1px; left: 6%; right: 6%; }
.page-block i:nth-child(1) { top: 18%; } .page-block i:nth-child(2) { top: 52%; } .page-block i:nth-child(3) { top: 81%; }

/* ————— page-turn overlay ————— */

.flip {
  position: absolute; top: 0; height: 100%; width: 50%; right: 0; z-index: 8;
  transform-origin: left center;
  transform-style: preserve-3d;
}
.flip.backwards { right: auto; left: 0; transform-origin: right center; }
.flip-face { position: absolute; inset: 0; backface-visibility: hidden; }
.flip-face .paper { box-shadow: 0 18px 44px rgba(0,0,0,.5); }
.flip-face.back { transform: rotateY(180deg); }
.flip .flip-face.front .paper { border-radius: 0 3px 3px 0; }
.flip .flip-face.back .paper { border-radius: 3px 0 0 3px; }

/* ————— chrome ————— */

.chrome {
  position: absolute; left: 50%; transform: translateX(-50%);
  z-index: 12; display: flex; align-items: center; gap: 10px;
  opacity: 0; transition: opacity .45s var(--ease-out);
}
#reader.on .chrome { opacity: 1; }
#reader.quiet .chrome { opacity: .28; }
#reader.quiet .chrome:hover, #reader.quiet .chrome:focus-within { opacity: 1; }
.chrome.top { top: max(14px, env(safe-area-inset-top)); }
.chrome.bottom {
  bottom: max(14px, env(safe-area-inset-bottom));
  flex-direction: column; gap: 7px; width: min(680px, calc(100vw - 48px));
}
.chip {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--serif); font-size: 13px; letter-spacing: .04em;
  color: var(--cream); background: rgba(28,21,15,.72);
  border: 1px solid rgba(201,163,95,.25); border-radius: 999px;
  padding: 7px 14px; cursor: pointer;
  backdrop-filter: blur(10px);
  transition: background .2s, border-color .2s, transform .15s;
}
.chip:hover { background: rgba(44,33,22,.85); border-color: rgba(201,163,95,.5); }
.chip:active { transform: translateY(1px); }
.chip.icon { padding: 7px 11px; font-size: 15px; }
.chip svg { display: block; }
.chrome-title {
  display: flex; align-items: baseline; gap: 8px; max-width: 40vw;
  font-size: 13px; color: var(--cream-dim); font-style: italic;
  padding: 7px 14px; white-space: nowrap; overflow: hidden;
  background: rgba(28,21,15,.4); border-radius: 999px; backdrop-filter: blur(10px);
}
.chrome-title .ct-book { color: var(--cream); }
.ct-sep { opacity: .4; }

/* progress */
.progress input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 18px;
  background: transparent; cursor: pointer;
}
.progress input[type="range"]::-webkit-slider-runnable-track {
  height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, rgba(201,163,95,.8), rgba(201,163,95,.25));
}
.progress input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 13px; height: 13px; margin-top: -5.5px;
  border-radius: 50%; background: var(--brass);
  box-shadow: 0 2px 8px rgba(0,0,0,.6);
}
.progress input[type="range"]::-moz-range-track { height: 2px; background: rgba(201,163,95,.35); border-radius: 2px; }
.progress input[type="range"]::-moz-range-thumb { width: 13px; height: 13px; border: 0; border-radius: 50%; background: var(--brass); }
.progress-caption {
  display: flex; justify-content: space-between;
  font-size: 11.5px; color: var(--cream-dim); letter-spacing: .03em;
  font-variant-numeric: oldstyle-nums;
}
.progress-caption #pg-label { color: var(--cream); }

/* ————— appearance popover ————— */

.appear {
  position: absolute; top: 62px; right: max(14px, calc(50% - min(430px, 46vw)));
  z-index: 13; width: 240px;
  background: rgba(30,23,17,.96); border: 1px solid rgba(201,163,95,.3);
  border-radius: 12px; padding: 16px 18px;
  box-shadow: 0 30px 80px rgba(0,0,0,.55);
  backdrop-filter: blur(12px);
}
.appear-row { display: flex; align-items: center; justify-content: space-between; }
.appear-row + .appear-row { margin-top: 12px; padding-top: 12px; border-top: 1px solid rgba(201,163,95,.15); }
.appear-label { font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--cream-dim); }
.sizer { display: flex; gap: 6px; }
.sz {
  width: 34px; height: 34px; border-radius: 8px; cursor: pointer;
  background: rgba(255,255,255,.05); color: var(--cream);
  border: 1px solid rgba(201,163,95,.2); font-family: var(--serif);
  display: grid; place-items: center;
}
.sz.small { font-size: 12px; } .sz.mid { font-size: 15px; } .sz.big { font-size: 19px; }
.sz.on { background: rgba(201,163,95,.22); border-color: rgba(201,163,95,.6); }
.themes { display: flex; gap: 8px; }
.th {
  width: 34px; height: 34px; border-radius: 50%; cursor: pointer;
  border: 1px solid rgba(201,163,95,.3); background: none; padding: 3px;
}
.th i { display: block; width: 100%; height: 100%; border-radius: 50%; }
.th[data-theme="light"] i { background: linear-gradient(135deg, #fbf7ee, #e9e0c8); }
.th[data-theme="sepia"] i { background: linear-gradient(135deg, #f2e4c9, #d9c39a); }
.th[data-theme="dark"] i { background: linear-gradient(135deg, #3a352e, #191714); }
.th.on { border-color: var(--brass); box-shadow: 0 0 0 1px rgba(201,163,95,.4); }

/* ————— TOC ————— */

.toc {
  position: absolute; top: 0; bottom: 0; left: 0; z-index: 14;
  width: min(360px, 88vw);
  background: linear-gradient(175deg, rgba(26,20,14,.98), rgba(16,12,8,.99));
  border-right: 1px solid rgba(201,163,95,.25);
  box-shadow: 30px 0 80px rgba(0,0,0,.5);
  transform: translateX(-102%); transition: transform .45s var(--ease-in-out);
  display: flex; flex-direction: column;
  visibility: hidden;
}
.toc.on { transform: none; visibility: visible; }
.toc-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 22px 14px;
  font-size: 14px; letter-spacing: .3em; text-transform: uppercase; color: var(--cream);
}
.toc-list { flex: 1; overflow-y: auto; padding: 4px 12px 28px; scrollbar-width: thin; scrollbar-color: #5a4a33 transparent; }
.toc-group {
  font-size: 10.5px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--brass-dim); padding: 16px 12px 6px;
}
.toc-item {
  display: flex; align-items: baseline; gap: 10px; width: 100%;
  background: none; border: 0; cursor: pointer; text-align: left;
  font-family: var(--serif); font-size: 15px; color: #c9bda6;
  padding: 8px 12px; border-radius: 7px; line-height: 1.3;
}
.toc-item:hover { background: rgba(201,163,95,.1); color: var(--cream); }
.toc-item.on { color: var(--brass); background: rgba(201,163,95,.08); }
.toc-item .tp { margin-left: auto; font-size: 11.5px; color: var(--cream-dim); font-variant-numeric: oldstyle-nums; white-space: nowrap; }

/* ————— edge hit zones & toast ————— */

.edge-hit { position: absolute; top: 0; bottom: 0; width: 16%; z-index: 9; cursor: pointer; }
.edge-hit.left { left: 0; }
.edge-hit.right { right: 0; }
.edge-hit::after {
  content: ""; position: absolute; top: 50%; width: 26px; height: 26px; margin-top: -13px;
  border-top: 1px solid rgba(237,227,207,.0); transition: border-color .3s;
}
.edge-hit.left::after { left: 18px; transform: rotate(-45deg); border-left: 1px solid transparent; }
.edge-hit.right::after { right: 18px; transform: rotate(45deg); border-right: 1px solid transparent; }
.edge-hit:hover::after { border-color: rgba(237,227,207,.5); }

.resume-toast {
  position: absolute; top: 66px; left: 50%; transform: translateX(-50%) translateY(-6px);
  z-index: 15; padding: 9px 18px;
  background: rgba(30,23,17,.92); border: 1px solid rgba(201,163,95,.3); border-radius: 999px;
  color: var(--cream); font-size: 13px; font-style: italic;
  box-shadow: 0 16px 44px rgba(0,0,0,.5);
  opacity: 0; transition: opacity .4s var(--ease-out), transform .4s var(--ease-out);
  pointer-events: none; white-space: nowrap;
}
.resume-toast.on { opacity: 1; transform: translateX(-50%); }

/* ————— single page (mobile) ————— */

#reader[data-pages="1"] .book { width: var(--pw); }
#reader[data-pages="1"] .spread { grid-template-columns: 1fr; }
#reader[data-pages="1"] .sheet.left, #reader[data-pages="1"] .spine-gutter { display: none; }
#reader[data-pages="1"] .flip { width: 100%; }
#reader[data-pages="1"] .sheet.right .paper::after { display: none; }
#reader[data-pages="1"] .chrome-title { max-width: 46vw; }
#reader[data-pages="1"] .edge-hit { width: 24%; }

@media (max-width: 760px) {
  .chrome.top { top: max(8px, env(safe-area-inset-top)); }
  .chrome.top .chrome-title { display: none; }
  .chip span { display: none; }
  #reader .flow-wrap { top: 7.8%; bottom: 7%; left: 7.5%; right: 7.5%; }
}

@media (prefers-reduced-motion: reduce) {
  .sheet, .spine-gutter, .cover, .toc { transition-duration: .12s; }
}