/* Main studio layout with a masthead, stage, and page toolbar. */
:root {
  --bg: #FEFAF3;
  --surface: #F6E2E9;
  --surface-2: #B8CFB3;
  --ink: #2D4031;
  --muted: #5D7161;
  --line: #84A282;
  --accent: #84A282;
  --accent-ink: #FEFAF3;
  --accent-soft: #F6E2E9;
  --ok: #4F7957;
  --danger: #A34F63;
  --focus: #84A282;
  --shadow: 0 18px 50px rgba(45, 64, 49, .18);
  --backdrop: #FEFAF3;
  --backdrop-ink: #2D4031;

  --font-display: "Bodoni Moda", Georgia, serif;
  --font-ui: "Bodoni Moda", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --bar-h: 56px;
  --tool-h: 52px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0E1014;
    --surface: #171A20;
    --surface-2: #1F232B;
    --ink: #ECEEF2;
    --muted: #9AA1AE;
    --line: #2B303A;
    --accent: #FF5C9A;
    --accent-ink: #1C0611;
    --accent-soft: #3A1628;
    --ok: #4CC38A;
    --danger: #FF7B6F;
    --focus: #FF5C9A;
    --shadow: 0 18px 50px rgba(0, 0, 0, .55);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0E1014;
  --surface: #171A20;
  --surface-2: #1F232B;
  --ink: #ECEEF2;
  --muted: #9AA1AE;
  --line: #2B303A;
  --accent: #FF5C9A;
  --accent-ink: #1C0611;
  --accent-soft: #3A1628;
  --ok: #4CC38A;
  --danger: #FF7B6F;
  --focus: #FF5C9A;
  --shadow: 0 18px 50px rgba(0, 0, 0, .55);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 14px/1.5 var(--font-ui);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
[hidden] { display: none !important; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--accent); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.icon { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.mono { font-family: var(--font-mono); }

/* App frame */
.app {
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  grid-template-columns: minmax(0, 1fr);
  min-height: 0;
  width: 100%;
}
.app > * { min-width: 0; }

/* Top bar */
.topbar {
  display: flex;
  align-items: center;
  min-height: var(--bar-h);
  padding: 8px 16px;
  padding-top: calc(8px + env(safe-area-inset-top, 0px));
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: relative;
  z-index: 5;
}
.brand { display: flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; flex: none; }
.brand-mark { width: 28px; height: 28px; }
.bm-left { fill: var(--ink); }
.bm-right { fill: var(--accent); }
.bm-curl { fill: var(--surface); opacity: .9; }
.brand-name { font-family: var(--font-display); font-size: 22px; letter-spacing: .01em; }
.doc {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  min-width: 0;
  width: min(520px, calc(100% - 220px));
  padding-left: 0;
  text-align: center;
}
.doc-title {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 400;
  line-height: 1.15;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.doc-sub {
  display: block;
  margin-top: 2px;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.doc-sep { margin: 0 6px; }
.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  position: relative;
  z-index: 1;
}
.made-with { font-size: 13px; font-weight: 600; text-decoration: none; padding: 0 6px; }
.made-with:hover { text-decoration: underline; }

/* Buttons and fields */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 38px;
  padding: 0 14px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color .15s, border-color .15s, color .15s;
}
.btn:hover { background: var(--surface-2); border-color: color-mix(in srgb, var(--line) 60%, var(--ink)); }
.btn:disabled, .btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 88%, var(--ink)); border-color: transparent; }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-icon { width: 38px; padding: 0; }
.btn-wide { width: 100%; }
.btn .icon { width: 18px; height: 18px; }
.link-btn {
  background: none;
  border: 0;
  padding: 0;
  color: var(--accent);
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.input {
  width: 100%;
  min-width: 0;
  height: 40px;
  padding: 0 12px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--ink);
}
.settings-text-input {
  background: var(--backdrop);
  color: var(--backdrop-ink);
}
textarea.input { height: auto; padding: 10px 12px; resize: vertical; line-height: 1.5; }
.input.code { font-size: 12px; word-break: break-all; }
.input.color { padding: 4px; height: 40px; cursor: pointer; }
.input:focus { outline: 2px solid var(--focus); outline-offset: -1px; border-color: transparent; }
.input-inline { width: auto; }
.field-label { display: block; font-size: 12px; font-weight: 600; letter-spacing: .03em; color: var(--muted); margin-bottom: 6px; }
.field-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.field-row .field-label { margin: 0; }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field-grid.three { grid-template-columns: 1fr 1fr 1.3fr; }
.field-msg { margin: 8px 0 0; font-size: 13px; color: var(--muted); }
.field-msg[data-kind="error"] { color: var(--danger); }
.field-msg[data-kind="ok"] { color: var(--ok); }
.input-row { display: flex; gap: 8px; }
.input-row .input { flex: 1; }
.row-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 12px; }
.stack { display: flex; flex-direction: column; gap: 16px; }
.stack > .row-actions { margin-top: 0; }
.check { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); cursor: pointer; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }
.hint { font-size: 13px; color: var(--muted); margin: 12px 0 0; }
.stack > .hint { margin: 0; }
.lede { margin: 0 0 16px; font-size: 14px; }
.note { padding: 12px 14px; border-radius: var(--r-md); background: var(--accent-soft); margin-bottom: 16px; font-size: 13px; }

/* Segmented control */
.seg { display: flex; flex-wrap: wrap; gap: 6px; }
.seg button {
  flex: 1 1 auto;
  height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.seg button[aria-checked="true"] { background: var(--ink); color: var(--surface); border-color: var(--ink); }
.seg-dim { font-family: var(--font-mono); font-weight: 400; font-size: 11px; opacity: .7; margin-left: 4px; }

/* Switch */
.switch { display: flex; align-items: flex-start; gap: 12px; cursor: pointer; font-size: 14px; margin-top: 10px; }
.switch input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.switch-ui {
  flex: none;
  width: 36px; height: 20px;
  border-radius: 999px;
  background: #FEFAF3;
  box-shadow: inset 0 0 0 1px var(--line);
  position: relative;
  margin-top: 1px;
  transition: background-color .15s;
}
.switch-ui::after {
  content: "";
  position: absolute; top: 2px; left: 2px;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--surface);
  box-shadow: 0 1px 2px rgba(0,0,0,.25);
  transition: transform .15s;
}
.switch input:checked + .switch-ui { background: #84A282; }
.switch input:checked + .switch-ui::after { transform: translateX(16px); }
.switch input:focus-visible + .switch-ui { outline: 2px solid var(--focus); outline-offset: 2px; }
.fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }

/* Progress bar */
.bar { height: 4px; border-radius: 999px; background: var(--line); overflow: hidden; margin-top: 12px; }
.bar > span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.bar.indeterminate > span { width: 35%; animation: indet 1.1s ease-in-out infinite; }
@keyframes indet { from { transform: translateX(-100%); } to { transform: translateX(300%); } }

/* Stage */
.stage {
  --stage: #2A2D34;
  position: relative;
  min-height: 0;
  overflow: hidden;
  background-color: var(--stage);
  background-image:
    radial-gradient(ellipse 70% 60% at 50% 45%, rgba(255,255,255,.07), rgba(255,255,255,0) 70%),
    radial-gradient(ellipse 120% 90% at 50% 50%, rgba(0,0,0,0) 55%, rgba(0,0,0,.22) 100%);
  transition: background-color .3s;
}
/* Stage colors come from the creator's backdrop, not the app theme. */
.stage[data-tone="dark"] { --sfg: #F2F3F5; --sbtn: rgba(255,255,255,.10); --sbtn-h: rgba(255,255,255,.2); --snote: rgba(10,11,14,.55); }
.stage[data-tone="light"] { --sfg: #16181D; --sbtn: rgba(0,0,0,.06); --sbtn-h: rgba(0,0,0,.12); --snote: rgba(255,255,255,.7); }
.book-frame {
  position: absolute;
  inset: 32px 76px;
}
.nav-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 0;
  display: grid; place-items: center;
  background: var(--sbtn);
  color: var(--sfg);
  cursor: pointer;
  z-index: 3;
  transition: background-color .15s, opacity .15s;
}
.nav-arrow:hover { background: var(--sbtn-h); }
.nav-arrow:disabled { opacity: .25; cursor: default; }
.nav-arrow .icon { width: 24px; height: 24px; }
.nav-prev { left: 16px; }
.nav-next { right: 16px; }

.empty-state {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 4;
  width: min(360px, calc(100% - 32px));
  padding: 28px 24px;
  text-align: center;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
}
.empty-state .icon {
  width: 32px;
  height: 32px;
  margin-bottom: 8px;
  color: var(--accent);
}
.empty-state h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 400;
}
.empty-state p {
  margin: 4px 0 16px;
  color: var(--muted);
}

.overlay-card {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  z-index: 6;
  width: min(420px, calc(100% - 32px));
  padding: 20px 22px;
  border-radius: var(--r-lg);
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow);
}
.loading-label { font-weight: 600; }
.error-title { font-family: var(--font-display); font-weight: 400; font-size: 26px; margin: 0 0 6px; text-wrap: balance; }
.error-text { margin: 0; color: var(--muted); }

/* Book */
.book { width: 100%; height: 100%; transition: transform .5s cubic-bezier(.2,.7,.2,1); }
.stf__parent { position: relative; display: block; box-sizing: border-box; transform: translateZ(0); touch-action: pan-y; }
.stf__wrapper { position: relative; width: 100%; height: 100%; box-sizing: border-box; }
.stf__block { position: absolute; inset: 0; width: 100%; height: 100%; box-sizing: border-box; perspective: 2000px; }
.stf__item { display: none; position: absolute; transform-style: preserve-3d; }
.stf__outerShadow, .stf__innerShadow, .stf__hardShadow, .stf__hardInnerShadow { position: absolute; left: 0; top: 0; }
.page { background: #FFFFFF; overflow: hidden; }
.page-inner { position: absolute; inset: 0; }
.page img {
  display: block;
  width: 100%; height: 100%;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}
.page.is-empty img { visibility: hidden; }
.page-inner::after { content: ""; position: absolute; inset: 0; pointer-events: none; }
.page--left .page-inner::after { background: linear-gradient(to left, rgba(0,0,0,.20), rgba(0,0,0,.05) 3%, rgba(0,0,0,0) 8%); }
.page--right .page-inner::after { background: linear-gradient(to right, rgba(0,0,0,.20), rgba(0,0,0,.05) 3%, rgba(0,0,0,0) 8%); }
.is-portrait .page-inner::after, .page[data-density="hard"] .page-inner::after { background: none; }
.page-spinner {
  position: absolute; left: 50%; top: 50%;
  width: 28px; height: 28px; margin: -14px 0 0 -14px;
  border-radius: 50%;
  border: 2px solid #D9DCE2;
  border-top-color: #C2185B;
  animation: spin .8s linear infinite;
}
.page:not(.is-empty) .page-spinner { display: none; }
.page.is-failed .page-spinner { display: none; }
.page.is-failed .page-inner::before {
  content: "This page couldn’t be drawn";
  position: absolute; inset: 0; display: grid; place-items: center;
  font: 500 13px var(--font-ui); color: #6B7080;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Thumbnails */
.thumbs {
  background: var(--surface);
  border-top: 1px solid var(--line);
}
.thumbs-track {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding: 12px 16px;
  scroll-snap-type: x proximity;
}
.thumb {
  flex: none;
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  scroll-snap-align: center;
}
.thumb-img {
  height: 104px;
  aspect-ratio: var(--ratio, .8);
  max-width: 180px;
  background: #FFFFFF;
  border-radius: 2px;
  outline: 1px solid var(--line);
  overflow: hidden;
}
.thumb-img img { width: 100%; height: 100%; object-fit: contain; display: block; }
.thumb-num { font-family: var(--font-mono); font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; }
.thumb.is-active .thumb-img { outline: 2px solid var(--accent); }
.thumb.is-active .thumb-num { color: var(--accent); font-weight: 500; }

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: var(--tool-h);
  padding: 6px 12px;
  padding-bottom: calc(6px + env(safe-area-inset-bottom, 0px));
  background: var(--surface);
  border-top: 1px solid var(--line);
  z-index: 5;
}
.tb-group { display: flex; align-items: center; gap: 2px; }
.tb-btn {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border: 0; border-radius: var(--r-sm);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.tb-btn:hover { background: var(--surface-2); }
.tb-btn:disabled { opacity: .35; cursor: default; background: transparent; }
.tb-btn[aria-pressed="true"]#tbThumbs { background: var(--accent-soft); color: var(--accent); }
.folio {
  display: flex; align-items: baseline; gap: 4px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  padding: 0 6px;
}
.folio-input {
  width: 4.6em;
  height: 32px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 14px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  background: var(--surface-2);
  padding: 0 6px;
}
.folio-input:focus { outline: 2px solid var(--focus); outline-offset: -1px; }
.folio-total { font-size: 13px; color: var(--muted); white-space: nowrap; }
.tb-progress { display: flex; align-items: center; gap: 10px; min-width: 0; font-size: 12px; color: var(--muted); font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.tb-progress-bar { width: 120px; height: 3px; border-radius: 999px; background: var(--line); overflow: hidden; flex: none; }
.tb-progress-bar > span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.tb-progress-text { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tb-open { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: 13px; text-decoration: none; padding: 0 8px; }
.tb-open .icon { width: 16px; height: 16px; }

/* Drawers */
.scrim {
  position: fixed; inset: 0;
  background: rgba(8, 9, 12, .4);
  z-index: 20;
  opacity: 0;
  transition: opacity .25s;
}
.scrim.show { opacity: 1; }
.drawer {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: min(460px, 100%);
  z-index: 30;
  display: flex; flex-direction: column;
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow);
  transform: translateX(100%);
  visibility: hidden;
  transition: transform .3s cubic-bezier(.2,.7,.2,1), visibility 0s linear .3s;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.drawer.open { transform: none; visibility: visible; transition: transform .3s cubic-bezier(.2,.7,.2,1); }
.drawer-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 16px 8px 20px; }
.drawer-title { font-family: var(--font-display); font-weight: 400; font-size: 30px; line-height: 1.1; margin: 0; }
.drawer-body { flex: 1; overflow-y: auto; padding: 16px 20px 28px; min-height: 0; }
.tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  padding: 4px 20px 16px;
  border-bottom: 1px solid var(--line);
}
.tabs [role="tab"] {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-width: 0;
  height: 36px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--surface);
  font-size: 13px; font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tabs [role="tab"]:hover { color: var(--ink); background: var(--surface-2); }
.tabs [role="tab"] .icon { width: 16px; height: 16px; }
.tabs [role="tab"][aria-selected="true"] { color: var(--surface); background: var(--ink); border-color: var(--ink); }
.sec-title { font-size: 13px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; }
.sec-title:not(:first-child) { margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); }

.option {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 16px;
  margin-bottom: 12px;
}
.option-head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.option-head h3 { margin: 0; font-size: 15px; font-weight: 600; }
.option-key {
  width: 22px; height: 22px; flex: none;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 11px; color: var(--muted);
}
.option p { margin: 0 0 12px; color: var(--muted); font-size: 13px; }
.steps { margin: 0 0 12px; padding-left: 20px; color: var(--muted); font-size: 13px; }
.steps li + li { margin-top: 2px; }
.option .input-row { margin-top: 12px; }
.option > .btn:first-of-type + .input-row { margin-top: 12px; }

.needs-link { padding: 16px; border: 1px dashed var(--line); border-radius: var(--r-md); text-align: center; }
.needs-link p { margin: 0 0 12px; color: var(--muted); }
.needs-link.compact { text-align: left; }

/* Social */
.social-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 16px 0 12px; }
.social {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 12px 6px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  color: var(--ink);
  text-decoration: none;
  font-size: 12.5px; font-weight: 600;
  transition: border-color .15s, background-color .15s;
}
.social:hover { background: var(--surface-2); border-color: var(--muted); }
.social-mark {
  width: 34px; height: 34px;
  border-radius: 50%;
  display: grid; place-items: center;
  background: var(--c);
  color: #FFFFFF;
  font: 700 14px/1 var(--font-ui);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.18);
}

/* Share card + QR previews */
.card-preview {
  margin-top: 12px;
  padding: 12px;
  border-radius: var(--r-md);
  background: var(--surface-2);
  display: grid; place-items: center;
}
.card-preview canvas { display: block; max-width: 100%; max-height: 360px; width: auto; height: auto; border-radius: 4px; box-shadow: 0 6px 18px rgba(0,0,0,.18); }
.qr-preview { display: grid; place-items: center; padding: 16px; border-radius: var(--r-md); background: var(--surface-2); }
.qr-preview canvas { width: min(240px, 100%); height: auto; display: block; border-radius: 4px; }

/* Downloads */
.dl-list { list-style: none; padding: 0; margin: 16px 0 0; border-top: 1px solid var(--line); }
.dl-list li { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.dl-icon { width: 38px; height: 38px; display: grid; place-items: center; border-radius: var(--r-sm); background: var(--surface-2); color: var(--muted); }
.dl-text { display: flex; flex-direction: column; min-width: 0; }
.dl-text strong { font-weight: 600; }
.dl-text span { font-size: 12.5px; color: var(--muted); }

/* Settings */
.swatches { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 8px; }
.swatch {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 0; border: 0; background: none;
  font-size: 11.5px; color: var(--muted); cursor: pointer; text-align: center;
  position: relative;
}
.swatch > span:first-child, .sw-custom {
  width: 100%; aspect-ratio: 4 / 3; max-width: 72px;
  border-radius: var(--r-sm);
  background: var(--sw);
  box-shadow: inset 0 0 0 1px rgba(127,127,127,.35);
}
.sw-custom { background: conic-gradient(from 0deg, #C2185B, #F2A33A, #3BB273, #2E7DD7, #8E44AD, #C2185B); }
.swatch-custom input { position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 100%; max-width: 72px; aspect-ratio: 4 / 3; opacity: 0; cursor: pointer; border: 0; padding: 0; }
.swatch[aria-pressed="true"] { color: var(--ink); font-weight: 600; }
.swatch[aria-pressed="true"] > span:first-child, .swatch[aria-pressed="true"] .sw-custom { outline: 2px solid var(--accent); outline-offset: 2px; }
.fieldset .seg { margin-bottom: 4px; }

/* Zoom */
.zoom { position: fixed; inset: 0; z-index: 40; background: rgba(12, 13, 16, .95); color: #F2F3F5; display: flex; flex-direction: column; padding-top: env(safe-area-inset-top, 0px); }
.zoom-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 16px; }
.zoom-label { font-family: var(--font-mono); font-size: 13px; color: #B9BDC7; }
.zoom-ctrls { display: flex; align-items: center; gap: 4px; }
.zoom-btn { width: 40px; height: 40px; border-radius: var(--r-sm); border: 0; background: rgba(255,255,255,.08); color: #F2F3F5; font-size: 20px; cursor: pointer; display: grid; place-items: center; }
.zoom-btn:hover { background: rgba(255,255,255,.16); }
.zoom-btn:disabled { opacity: .35; cursor: default; background: rgba(255,255,255,.08); }
.zoom-level { font-family: var(--font-mono); font-size: 13px; width: 52px; text-align: center; font-variant-numeric: tabular-nums; }
.zoom-scroll { flex: 1; overflow: auto; cursor: grab; touch-action: pan-x pan-y; }
.zoom-scroll.dragging { cursor: grabbing; }
.zoom-content { display: flex; gap: 0; width: max-content; min-width: 100%; min-height: 100%; align-items: center; justify-content: center; padding: 16px; }
.zoom-content img { display: block; background: #FFFFFF; box-shadow: 0 10px 40px rgba(0,0,0,.5); user-select: none; -webkit-user-drag: none; }

/* Drop overlay and toast */
.drop-overlay {
  position: fixed; inset: 0; z-index: 50;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  padding: 24px;
  pointer-events: none;
}
.drop-target {
  position: relative;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  width: min(460px, 100%);
  padding: 48px 24px;
  text-align: center;
  background: var(--surface);
  border-radius: var(--r-sm);
  box-shadow: var(--shadow);
}
/* Crop marks at each corner */
.drop-target::before, .drop-target::after {
  content: ""; position: absolute; inset: -14px;
  pointer-events: none;
  background:
    linear-gradient(var(--accent), var(--accent)) left 0 top 14px / 10px 1.5px no-repeat,
    linear-gradient(var(--accent), var(--accent)) left 14px top 0 / 1.5px 10px no-repeat,
    linear-gradient(var(--accent), var(--accent)) right 0 top 14px / 10px 1.5px no-repeat,
    linear-gradient(var(--accent), var(--accent)) right 14px top 0 / 1.5px 10px no-repeat,
    linear-gradient(var(--accent), var(--accent)) left 0 bottom 14px / 10px 1.5px no-repeat,
    linear-gradient(var(--accent), var(--accent)) left 14px bottom 0 / 1.5px 10px no-repeat,
    linear-gradient(var(--accent), var(--accent)) right 0 bottom 14px / 10px 1.5px no-repeat,
    linear-gradient(var(--accent), var(--accent)) right 14px bottom 0 / 1.5px 10px no-repeat;
}
.drop-target::after { display: none; }
.drop-target .icon { width: 36px; height: 36px; color: var(--accent); }
.drop-target strong { font-family: var(--font-display); font-weight: 400; font-size: 30px; }
.drop-target span { color: var(--muted); }

.toast {
  position: fixed;
  left: 50%; bottom: calc(var(--tool-h) + 20px + env(safe-area-inset-bottom, 0px));
  transform: translate(-50%, 12px);
  z-index: 60;
  max-width: calc(100% - 32px);
  padding: 10px 16px;
  border-radius: var(--r-md);
  background: var(--ink);
  color: var(--surface);
  font-weight: 500;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast[data-kind="error"] { background: var(--danger); color: #FFFFFF; }

/* Modes */
.is-reader [data-creator] { display: none !important; }
body:not(.is-reader) [data-reader] { display: none !important; }
.no-download [data-download] { display: none !important; }
.is-embed .topbar { display: none; }
.is-embed .app { grid-template-rows: 1fr auto auto; }
.is-embed .book-frame { inset: 12px 56px; }
.is-embed .nav-prev { left: 6px; }
.is-embed .nav-next { right: 6px; }
.is-embed .nav-arrow { width: 40px; height: 40px; }
.is-reader-page .app { grid-template-rows: 1fr; }
.is-reader-page .topbar,
.is-reader-page .thumbs,
.is-reader-page .toolbar,
.is-reader-page .nav-arrow { display: none !important; }
.is-reader-page .stage { min-height: 100vh; }
.is-reader-page .book-frame { inset: 0; }

/* Small screens */
@media (max-width: 760px) {
  .doc { width: calc(100% - 220px); }
  .btn-label { display: none; }
  #btnUpload { width: 38px; padding: 0; }
  .book-frame { inset: 16px 12px 16px; }
  .nav-arrow { display: none; }
  .tb-progress-bar { width: 56px; }
  .toolbar { gap: 4px; padding-left: 6px; padding-right: 6px; }
  .tb-group { min-width: 0; }
  .tb-progress { gap: 4px; }
  .tabs [role="tab"] { min-height: 40px; }
  .drawer {
    top: auto;
    width: 100%;
    max-height: 90%;
    border-radius: var(--r-lg) var(--r-lg) 0 0;
    transform: translateY(100%);
  }
}
@media (max-width: 480px) {
  .topbar { gap: 10px; padding-left: 12px; padding-right: 12px; }
  .top-actions { gap: 6px; }
  .doc { width: calc(100% - 190px); }
  .doc-title { font-size: 18px; }
  .doc-sub { font-size: 11px; }
  .hide-sm { display: none; }
  .tb-btn { width: 36px; }
  .folio { padding: 0 2px; }
  .folio-input { width: 3.8em; }
  .tb-progress-text { display: none; }
  .social-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .field-grid, .field-grid.three { grid-template-columns: 1fr 1fr; }
  .swatches { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .dl-list li { grid-template-columns: 1fr auto; }
  .dl-icon { display: none; }
  .input-row { flex-wrap: wrap; }
  .input-row .btn { flex: 1; }
}
@media (max-width: 360px) {
  .topbar { gap: 4px; padding-left: 8px; padding-right: 8px; }
  .top-actions { gap: 2px; }
  .doc { width: calc(100% - 176px); }
  .doc-title { font-size: 16px; }
  .doc-sub { display: none; }
  .btn-icon, #btnUpload { width: 34px; height: 34px; }
  #btnShare { padding: 0 8px; }
  .toolbar { gap: 0; }
  .tb-btn { width: 34px; }
  .tb-progress-bar { width: 36px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}