:root {
  --bg: #1b1e24;
  --panel: #242830;
  --panel2: #2c313b;
  --ink: #d8dce4;
  --dim: #8a919e;
  --accent: #4f9cf7;
  --border: #363c47;
  /* dark native chrome: number spinners, scrollbars, <select> popup, file
     dialogs, autofill — inherit the page theme instead of white system UI */
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.5 -apple-system, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  display: flex;
  flex-direction: column;
}

/* ---- header ---- */
header {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  background: var(--panel);
}
h1 { font-size: 17px; margin: 0; font-weight: 600; }
h1 .dim { color: var(--dim); font-weight: 400; font-size: 13px; margin-left: 8px; }
#fileRow { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 320px; }
.status {
  color: var(--dim); font-size: 13px; margin-left: auto;
  /* long book titles truncate on one line instead of wrapping */
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.status.err { color: #ff7b7b; }
.status.ok { color: #7bdc9b; }

/* ---- layout: preview (always visible) | settings | export ---- */
main {
  display: flex;
  flex: 1;
  overflow: hidden;
}
#preview {
  flex: 1;
  min-width: 0;              /* never pushed off by the rails */
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 12px;
  overflow: hidden;          /* page is always in view */
}
/* scrollable viewport for the canvas — fits at 100%, scrolls when zoomed in */
#canvasScroll {
  flex: 1;
  min-width: 0;
  height: 100%;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}
#canvasScroll #canvasWrap { margin: auto; }
#controls {
  width: 330px;
  min-width: 300px;
  max-width: 38vw;
  overflow-y: auto;
  padding: 14px;
  border-left: 1px solid var(--border);
  background: var(--panel);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
#exportPanel {
  width: 240px;
  min-width: 240px;
  max-width: 30vw;
  overflow-y: auto;
  padding: 14px;
  border-left: 1px solid var(--border);
  background: var(--panel);
}

/* ---- cards / controls ---- */
.card {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}
.card h2 {
  margin: 0 0 10px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--dim);
}
.ctrl {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 6px 0;
  font-size: 14px;
}
.ctrl i { color: var(--dim); font-style: normal; font-size: 12px; }
.ctrl.check { justify-content: flex-start; gap: 10px; cursor: pointer; }
.ctrl.check.disabled { opacity: 0.55; cursor: default; }
.ctrl.check.disabled input { cursor: not-allowed; }
.aaHint {
  font-style: italic;
  font-size: 11px;
  color: var(--accent);
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
}

/* ---- themed form controls (one dark-web look for every native input) ---- */
.ctrl select,
.ctrl input[type=text],
.ctrl input[type=number],
.ctrl input[type=url],
.ctrl input[type=search],
.chapter select {
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 8px;
  font: inherit;
  font-size: 13px;
  min-width: 0;
  transition: border-color 0.12s ease;
}
.ctrl select { max-width: 190px; cursor: pointer; }
.ctrl input[type=text],
.ctrl input[type=number],
.ctrl input[type=url],
.ctrl input[type=search] { flex: 1; width: auto; min-width: 70px; }
.ctrl input[type=number] { max-width: 90px; text-align: right; }

/* rows with long labels / free-text values: label on its own line, control
   takes the full row width — prevents narrow unreadable fields */
.ctrl.stacked {
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
}
.ctrl.stacked input[type=text],
.ctrl.stacked input[type=number] {
  max-width: none;
  width: 100%;
  text-align: left;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  letter-spacing: 0.02em;
}
.ctrl select:hover,
.ctrl input:hover,
.chapter select:hover { border-color: var(--dim); }
.ctrl select:focus-visible,
.ctrl input:focus-visible,
.chapter select:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(79, 156, 247, 0.25);
}
.ctrl input::placeholder { color: #5b6270; }
.ctrl select:disabled,
.ctrl input:disabled { opacity: 0.5; cursor: default; }
/* number input: hide native spinner, keep the field clean */
.ctrl input[type=number] {
  -moz-appearance: textfield;
  appearance: textfield;
}
.ctrl input[type=number]::-webkit-outer-spin-button,
.ctrl input[type=number]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.ctrl input[type=range] { flex: 1; accent-color: var(--accent); }
.ctrl output { min-width: 34px; text-align: right; color: var(--dim); font-size: 13px; }
.ctrl input[type=checkbox] { accent-color: var(--accent); width: 16px; height: 16px; flex: none; }

/* ---- buttons: one family, three looks (primary / default / secondary) ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  margin-top: 4px;
  text-decoration: none;
  box-sizing: border-box;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}
.btn:hover:not(:disabled) { background: rgba(79, 156, 247, 0.12); }
.btn:active:not(:disabled) { background: rgba(79, 156, 247, 0.22); }
.btn:disabled { opacity: 0.4; cursor: default; }

/* filled, high-emphasis action */
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}
.btn.primary:hover:not(:disabled) { background: #6cb0ff; border-color: #6cb0ff; }
.btn.primary:active:not(:disabled) { background: #3b86e8; }
.btn.primary:disabled { background: var(--accent); opacity: 0.4; }

/* muted, low-emphasis action (file pickers, secondary choices) */
.btn.secondary {
  border-color: var(--border);
  color: var(--dim);
  background: var(--bg);
}
.btn.secondary:hover:not(:disabled) { border-color: var(--dim); color: var(--ink); background: var(--panel2); }
.btn.secondary:active:not(:disabled) { background: var(--bg); }

/* buttons that live in a horizontal row (header, segmented rows) lose the
   full-width + top-margin behaviour of column buttons */
#fileRow .btn, .fileCtrl .btn { width: auto; margin-top: 0; }
.btn.small { padding: 5px 10px; font-size: 12px; border-radius: 6px; }

/* native file inputs: visually hidden, activated via their <label> */
.fileInput {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.fileCtrl { justify-content: space-between; }

/* segmented control (face presets) — radio-style button row */
.segRow { align-items: center; }
.segRow > span:first-child { margin-right: auto; padding-right: 10px; }
.seg {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
  flex: 1;
}
.segBtn {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--dim);
  border-radius: 7px;
  padding: 6px 10px;
  font: inherit;
  font-size: 12.5px;
  line-height: 1.3;
  cursor: pointer;
  transition: all 0.12s ease;
  text-align: center;
}
.segBtn:hover:not(.active) { border-color: var(--dim); color: var(--ink); }
.segBtn.active {
  background: rgba(79, 156, 247, 0.18);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}
.segBtn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

/* select kept for state but never shown (segmented buttons drive it) */
.visHidden { display: none; }

/* ---- custom-font upload submenu ---- */
.uploadBox {
  margin-top: 10px;
  padding: 10px 12px 4px;
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: 8px;
}
.uploadBox .hint { padding: 0; }
.uploadBox code {
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 4px;
  font-size: 11px;
  color: var(--ink);
}
.fontStatus {
  font-size: 12px;
  line-height: 1.5;
  padding: 6px 8px;
  margin: 4px 0;
  border-radius: 6px;
  word-break: break-word;
}
.fontStatus.ok { color: #7bdc9b; background: rgba(123, 220, 155, 0.08); }
.fontStatus.err { color: #ff7b7b; background: rgba(255, 123, 123, 0.08); }
.fontStatus:empty { display: none; }

/* hosted (static) deploy: the server-side rasterizer isn't deployed here */
.backendNote {
  border-left: 2px solid #ffb84d;
  background: rgba(255, 184, 77, 0.07);
  padding: 8px 10px;
  border-radius: 4px;
  margin: 6px 0 2px;
}
.backendNote b { color: #ffb84d; }
.uploadBox.noBackend .fileInput + .fileBtn { opacity: 0.5; }
#fontConvertBtn { margin-top: 8px; }

/* ---- scrollbars: dark, slim, consistent ---- */
* {
  scrollbar-width: thin;
  scrollbar-color: #444c5a var(--panel);
}
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background: #3a4150;
  border-radius: 6px;
  border: 2px solid transparent;
  background-clip: content-box;
}
*::-webkit-scrollbar-thumb:hover { background-color: #4c5567; }
*::-webkit-scrollbar-corner { background: transparent; }

/* focus ring on everything keyboard-reachable */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.hint { color: var(--dim); font-size: 12px; line-height: 1.6; padding: 0 4px; }

/* ---- canvas ---- */
#canvasWrap { position: relative; }
#page {
  background: #fff;
  border-radius: 4px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
  image-rendering: pixelated;
  /* size is set by app.js updateZoomCss() to fit the preview pane 1:1 */
}
#loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(27, 30, 36, 0.6);
  color: #fff;
  border-radius: 4px;
  font-size: 15px;
  letter-spacing: 0.05em;
}
.hidden { display: none !important; }

/* ---- pager: vertical rail right of the canvas ---- */
#pager {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: var(--panel2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  align-self: center;
}
#pager button {
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 14px;
  cursor: pointer;
  width: 100%;
}
#pager button:disabled { opacity: 0.35; cursor: default; }
#pageInfo { min-width: 90px; text-align: center; font-variant-numeric: tabular-nums; }
.chapter {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--dim);
  font-size: 12px;
  text-align: center;
  width: 100%;
}
.chapter select {
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 6px;
  max-width: 150px;
  font-size: 12px;
  width: 100%;
}
#coverBtn { font-size: 12px; }

/* view scale, at the bottom of the rail (view-only zoom, never re-renders) */
.scaleCtrl {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--dim);
  font-size: 12px;
  text-align: center;
  width: 100%;
  margin-top: 6px;
  border-top: 1px solid var(--border);
  padding-top: 8px;
}
.scaleCtrl input[type=range] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}
.scaleCtrl output { font-variant-numeric: tabular-nums; }

/* ---- export column (right rail) ---- */
#exportCard { border-color: rgba(79, 156, 247, 0.35); }
#exportSub { margin: -4px 0 8px; }
/* output-mode toggle: vertical full-width segments, same family as presets */
.exportSeg { display: flex; flex-direction: column; gap: 6px; margin: 2px 0 10px; }
.exportSeg .segBtn { text-align: center; padding: 7px 10px; }
.exportSeg .segBtn i { font-style: normal; color: var(--dim); font-size: 11px; margin-left: 5px; }
.exportSeg .segBtn.active i { color: #bcd8ff; }
#exportCard .ctrl { gap: 8px; }
#downloadBtn { margin-top: 6px; }
.exportStatus {
  color: var(--dim); font-size: 12px; font-style: italic; line-height: 1.5;
  margin-top: 8px; word-break: break-word; min-height: 0;
}
.exportStatus:empty { display: none; }
#exportCard button.btn:disabled { opacity: 0.35; cursor: default; }