/* ═══════════════════════════════════════════════════════════════
   XTC Converter Pro — iOS-style light theme.
   ═══════════════════════════════════════════════════════════════ */

:root {
  --bg: #F2F2F7;
  --card: #FFFFFF;
  --accent: #007AFF;
  --accent-press: #0062CC;
  --green: #34C759;
  --orange: #FF9500;
  --red: #FF3B30;
  --text: #1C1C1E;
  --text-2: #8A8A8E;
  --text-3: #AEAEB2;
  --hairline: rgba(60, 60, 67, 0.12);
  --hairline-strong: rgba(60, 60, 67, 0.18);
  --fill-quart: rgba(118, 118, 128, 0.08);
  --fill-tert: rgba(118, 118, 128, 0.12);
  --fill-sec: rgba(120, 120, 128, 0.16);
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-float: 0 8px 32px rgba(0, 0, 0, 0.12);
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text",
          "Segoe UI Variable Text", "Segoe UI", system-ui, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body { height: 100%; overflow: hidden; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  display: flex;
  flex-direction: column;
}

.hidden { display: none !important; }

/* ═══════════ TOOLBAR ═══════════ */
#toolbar {
  min-height: 66px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 22px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(24px) saturate(1.6);
  -webkit-backdrop-filter: blur(24px) saturate(1.6);
  border-bottom: 1px solid var(--hairline);
  position: relative;
  z-index: 10;
}

.tb-identity { min-width: 150px; }
.tb-title { font-size: 17px; font-weight: 700; letter-spacing: -0.2px; }
.tb-file  { font-size: 11px; color: var(--text-2); margin-top: 1px;
            max-width: 210px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.tb-actions { display: flex; gap: 8px; flex: 1; }
.tb-right { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

.tb-progress { display: flex; flex-direction: column; align-items: flex-end; gap: 5px; min-width: 190px; }

.tb-coffee { display: flex; align-items: center; flex-shrink: 0; opacity: 0.92; transition: opacity 0.12s; }
.tb-coffee:hover { opacity: 1; }
.tb-coffee img { height: 36px; width: auto; display: block; border-radius: 8px; }

/* Language toggle (top right) */
.lang-toggle {
  display: flex;
  padding: 2px;
  background: var(--fill-sec);
  border-radius: 8px;
  margin-left: 4px;
  flex-shrink: 0;
}
.lang-toggle button {
  border: none;
  background: transparent;
  font-family: var(--font);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.3px;
  color: var(--text-2);
  padding: 5px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.lang-toggle button.on {
  background: var(--card);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
}
.tb-status { font-size: 11px; color: var(--text-2); font-variant-numeric: tabular-nums; }
.progress-track { width: 190px; height: 4px; border-radius: 2px; background: var(--fill-sec); overflow: hidden; }
.progress-fill  { width: 0%; height: 100%; border-radius: 2px; background: var(--accent);
                  transition: width 0.25s ease; }

/* ═══════════ BUTTONS ═══════════ */
.btn {
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  padding: 0 16px;
  height: 36px;
  cursor: pointer;
  transition: transform 0.08s ease, background 0.12s ease, opacity 0.12s;
  white-space: nowrap;
  /* Real <button>s center their label by default; the plain <div>-based
     buttons v4 uses for a few actions (Import Font, Edit Chapters, cover
     Choose…) don't, so make it explicit for both. */
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn:active:not(:disabled) { transform: scale(0.965); }
.btn:disabled { opacity: 0.38; cursor: default; }

.btn.filled { background: var(--accent); color: #fff; }
.btn.filled:hover:not(:disabled) { background: var(--accent-press); }
.btn.green  { background: var(--green); color: #fff; }
.btn.green:hover:not(:disabled) { background: #2CB350; }
.btn.orange { background: var(--orange); color: #fff; }
.btn.orange:hover:not(:disabled) { background: #E88600; }
.btn.tinted { background: rgba(0, 122, 255, 0.13); color: var(--accent); }
.btn.tinted:hover:not(:disabled) { background: rgba(0, 122, 255, 0.20); }
.btn.plain  { background: transparent; color: var(--text-2); }
.btn.plain:hover:not(:disabled) { background: var(--fill-tert); color: var(--text); }
.btn.sm { height: 32px; padding: 0 13px; font-size: 12px; border-radius: 8px; }
.btn.block { display: block; width: calc(100% - 32px); margin: 14px 16px 4px; height: 42px; border-radius: 12px; }

.link-btn {
  display: block; width: 100%;
  background: none; border: none;
  color: var(--accent); font-family: var(--font); font-size: 12px; font-weight: 500;
  padding: 9px 0 11px; cursor: pointer; border-radius: 8px;
}
.link-btn:hover { background: var(--fill-quart); }

/* ═══════════ LAYOUT ═══════════ */
#main { display: flex; flex: 1; min-height: 0; position: relative; }

.side {
  width: 356px;
  flex-shrink: 0;
  overflow-y: auto;
  background: var(--bg);
}
#side-left  { border-right: 1px solid var(--hairline); }
#side-right { border-left: 1px solid var(--hairline); }

.side-caption {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
  padding: 16px 20px 0;
}
.side-pad { height: 28px; }

.row-value { font-size: 13px; color: var(--text-2); font-variant-numeric: tabular-nums; }
.card.top-gap { margin-top: 8px; }

/* Header & Footer Elements — drag-and-drop zones */
.hf-elements { padding: 12px 14px; display: flex; flex-direction: column; gap: 12px; }
.hf-zone-label {
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.03em; color: var(--text-2); margin-bottom: 5px;
}
.hf-zone-list {
  display: flex; flex-direction: column; gap: 5px;
  min-height: 34px;
  border: 1px dashed var(--hairline-strong);
  border-radius: 8px;
  padding: 5px;
}
.hf-item {
  display: flex; align-items: center; justify-content: space-between; gap: 6px;
  padding: 7px 8px 7px 10px;
  background: var(--fill-quart);
  border-radius: 7px;
  font-size: 13px; color: var(--text);
  user-select: none;
}
.hf-item-label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
/* iOS-style vertical stepper: one narrow capsule (like .seg/.pager-pill
   elsewhere in this app) with the two arrows stacked and a hairline
   divider between them, in neutral gray rather than the accent blue
   (which read as a link/primary-action color here, not a utility
   control). */
.hf-item-arrows {
  display: flex;
  flex-direction: column;
  background: var(--fill-sec);
  border-radius: 7px;
  overflow: hidden;
  flex-shrink: 0;
}
.hf-arrow-btn {
  width: 26px; height: 17px;
  border: none;
  background: transparent;
  color: var(--text-2);
  font-size: 9px;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
  display: flex; align-items: center; justify-content: center;
}
.hf-arrow-btn:first-child { border-bottom: 1px solid var(--hairline-strong); }
.hf-arrow-btn:hover:not(:disabled) { background: var(--fill-tert); color: var(--text); }
.hf-arrow-btn:active:not(:disabled) { background: var(--fill-tert); transform: scale(0.92); }
.hf-arrow-btn:disabled { color: var(--text-3); opacity: 0.35; cursor: default; }

.hyph-detected {
  font-size: 12px;
  color: var(--accent);
  padding: 2px 14px 10px;
}

.group-hint {
  font-size: 11px;
  color: var(--text-3);
  line-height: 1.5;
  padding: 7px 30px 0;
}

.inline-warning {
  font-size: 11px;
  color: var(--orange);
  line-height: 1.5;
  padding: 7px 14px 0;
}

@keyframes fadein { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; transform: none; } }

/* Presets */
.preset-card {
  margin: 12px 16px 4px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 12px 14px 4px;
}
.preset-row { display: flex; gap: 8px; margin-bottom: 6px; }
.grow { flex: 1; }

/* Grouped inset lists */
.group-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--text-2);
  padding: 18px 30px 7px;
}
.card {
  margin: 0 16px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 46px;
  padding: 0 14px;
}
.row.tall { min-height: 64px; }
.row + .row, .row + .slider-row, .slider-row + .row,
.slider-row + .slider-row, .field + .field {
  border-top: 1px solid var(--hairline);
}
.row-label { font-size: 13px; color: var(--text); flex-shrink: 0; }
.row-controls { display: flex; align-items: center; gap: 7px; }
.notice { color: var(--red); font-size: 12px; line-height: 1.6; }
.notice code { background: var(--fill-tert); padding: 1px 6px; border-radius: 5px; font-size: 11px; }

/* ═══════════ CONTROLS ═══════════ */

/* Select */
.select {
  font-family: var(--font);
  font-size: 13px;
  color: var(--text);
  background: var(--fill-quart);
  border: none;
  border-radius: 8px;
  padding: 7px 28px 7px 11px;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='11' height='7' viewBox='0 0 11 7'%3E%3Cpath d='M1 1l4.5 4.5L10 1' fill='none' stroke='%238A8A8E' stroke-width='1.8' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  max-width: 220px;
}
.select:hover { background-color: var(--fill-tert); }
.select.sm { padding: 5px 26px 5px 10px; font-size: 12px; }
.select.block { width: 100%; max-width: none; }

/* Number / text inputs */
.num {
  font-family: var(--font);
  font-size: 13px;
  width: 58px;
  padding: 6px 8px;
  text-align: center;
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
}
.num.xs { width: 42px; }
.num:focus, .text:focus { outline: 2px solid rgba(0, 122, 255, 0.45); outline-offset: -1px; }

.text {
  font-family: var(--font);
  font-size: 13px;
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
}
.text.block { width: 100%; }

.field { padding: 10px 14px 12px; }
.field label { display: block; font-size: 11px; color: var(--text-2); margin-bottom: 5px; }
.field-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }

/* iOS switch */
.switch { position: relative; display: inline-block; width: 51px; height: 31px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .knob {
  position: absolute; inset: 0;
  background: var(--fill-sec);
  border-radius: 16px;
  transition: background 0.2s ease;
  cursor: pointer;
}
.switch .knob::after {
  content: "";
  position: absolute;
  top: 2px; left: 2px;
  width: 27px; height: 27px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.15), 0 1px 1px rgba(0, 0, 0, 0.16);
  transition: transform 0.2s cubic-bezier(0.3, 1.2, 0.5, 1);
}
.switch input:checked + .knob { background: var(--green); }
.switch input:checked + .knob::after { transform: translateX(20px); }

/* iOS segmented control */
.seg {
  display: inline-flex;
  padding: 2px;
  background: var(--fill-sec);
  border-radius: 9px;
  flex-shrink: 0;
}
.seg button {
  border: none;
  background: transparent;
  font-family: var(--font);
  font-size: 12px;
  font-weight: 500;
  color: var(--text);
  padding: 5px 10px;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.seg button.on {
  background: var(--card);
  font-weight: 600;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12), 0 3px 8px rgba(0, 0, 0, 0.04);
}
/* Stacked variant: label on top, seg fills the row below */
.row.stacked-seg {
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding-top: 10px;
  padding-bottom: 10px;
}
.seg.seg-full { width: 100%; display: flex; }
.seg.seg-full button { flex: 1; text-align: center; }

/* iOS slider */
.slider-row { padding: 11px 14px 13px; }
.slider-head {
  display: flex; justify-content: space-between;
  font-size: 13px; color: var(--text); margin-bottom: 8px;
}
.slider-head .val { color: var(--text-2); font-variant-numeric: tabular-nums; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 28px;
  background: transparent;
  cursor: pointer;
  --pct: 50%;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(to right,
    var(--accent) 0%, var(--accent) var(--pct),
    #E4E4E9 var(--pct), #E4E4E9 100%);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.22), 0 0.5px 1px rgba(0, 0, 0, 0.2);
  margin-top: -10px;
  transition: transform 0.1s ease;
}
input[type="range"]:active::-webkit-slider-thumb { transform: scale(1.08); }

/* ═══════════ PREVIEW ═══════════ */
#preview { flex: 1; display: flex; flex-direction: column; min-width: 0; }

#canvas {
  flex: 1;
  overflow: auto;
  display: grid;
  place-items: center;
  padding: 34px;
  background:
    radial-gradient(1200px 500px at 50% -10%, rgba(0, 122, 255, 0.035), transparent),
    var(--bg);
}

#paper {
  background: #fff;
  border-radius: 6px;
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.06),
    0 12px 40px rgba(0, 0, 0, 0.13),
    0 2px 10px rgba(0, 0, 0, 0.06);
  overflow: hidden;
  line-height: 0;
  position: relative;
}
#del-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 59, 48, 0.10);
  border: 3px solid #FF3B30;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: #FF3B30;
  letter-spacing: 0.10em;
  pointer-events: none;
}
#btn-del-page { font-size: 17px; padding-bottom: 2px; order: 4; }
#exportPageBtn { order: 5; }
#btn-del-page.del-active {
  background: rgba(255, 59, 48, 0.12);
  color: #FF3B30;
}
/* Desktop: icon-only round button (as before) — the text label only
   shows up on mobile, where it's restyled into a regular labeled
   button to match Export Page (see the mobile media query). */
.del-label { display: none; }
#placeholder {
  position: absolute;
  inset: 0;
  display: grid; place-items: center;
  font-size: 15px; color: var(--text-3);
  line-height: 1.5;
  background: #fff;
  text-align: center;
  padding: 20px;
}

/* No book loaded yet: dim and block every tool except the toolbar itself
   (Import EPUB / Export buttons live there, outside #main). */
body.no-book #side-left,
body.no-book #side-right,
body.no-book #pagerbar {
  opacity: 0.4;
  pointer-events: none;
}
#page-img { display: block; width: 440px; height: auto; }

/* Pager bar — single row (go-to and Refresh were removed, Monitor DPI
   moved to the toolbar, freeing up enough width for everything else to
   fit: chapter select, slider, prev/count/next, delete, export page). */
#pagerbar {
  height: 66px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(24px) saturate(1.6);
  -webkit-backdrop-filter: blur(24px) saturate(1.6);
  border-top: 1px solid var(--hairline);
}

.pager-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

/* .pager-nav-row/.pager-tools-row exist purely so the mobile layout
   (below) can force page-slider+pager-pill and chapterSelect+export+
   delete into two guaranteed rows via real flex containers, instead of
   relying on flex-wrap to break lines organically (which reflows
   item-by-item as width changes). On desktop they're unwrapped via
   display:contents, so their children act as plain .pager-row flex
   items — the explicit `order` values below restore the original
   left-to-right desktop sequence regardless of where each item now
   physically sits in the markup. */
.pager-nav-row, .pager-tools-row { display: contents; }

#chapterSelect { min-width: 90px; max-width: 130px; order: 1; }

.pager-pill {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--fill-quart);
  border-radius: 14px;
  padding: 4px 6px;
  order: 3;
}
.nav-btn {
  width: 38px; height: 38px;
  border: none; border-radius: 10px;
  background: transparent;
  color: var(--accent);
  font-size: 22px; line-height: 1;
  cursor: pointer;
  transition: background 0.12s;
  padding-bottom: 4px;
}
.nav-btn:hover { background: var(--fill-tert); }
.nav-btn:active { transform: scale(0.94); }

.pager-count {
  font-size: 14px; font-weight: 600;
  font-variant-numeric: tabular-nums;
  min-width: 72px; text-align: center;
  padding: 0 6px;
}

#pageSlider { flex: 1; min-width: 120px; max-width: 300px; order: 2; }

.zoom-box {
  flex-shrink: 0;
  display: flex; align-items: center; gap: 10px;
  font-size: 12px; color: var(--text-2);
  white-space: nowrap;
}
.zoom-box input[type="range"] { width: 110px; }

/* ═══════════ EXPORT OVERLAY ═══════════ */
#export-overlay {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 200;
  animation: fadein 0.15s ease;
}
#export-card {
  background: var(--card);
  border-radius: 22px;
  padding: 30px 40px 24px;
  text-align: center;
  box-shadow: 0 24px 72px rgba(0, 0, 0, 0.22);
  min-width: 300px;
}
#export-title {
  font-size: 15px; font-weight: 600; color: var(--text);
  margin-bottom: 18px; letter-spacing: -0.01em;
}
/* Shown while any progress overlay is up (export, loading, etc.) so it
   stays in view for as long as the user is waiting. */
.export-card-coffee { justify-content: center; margin-bottom: 16px; }
.export-track {
  height: 8px; background: var(--fill-sec); border-radius: 4px;
  overflow: hidden; margin-bottom: 10px;
}
.export-fill {
  height: 100%; background: var(--green); border-radius: 4px;
  transition: width 0.3s ease; width: 0%;
}
#export-pct { font-size: 13px; color: var(--text-2); font-variant-numeric: tabular-nums; }
#progress-ok-btn { margin-top: 16px; min-width: 100px; }

/* ═══════════ SCRUB CHIPS ═══════════ */
.scrub-chips { display: flex; flex-wrap: wrap; gap: 5px; padding: 10px 14px 2px; min-height: 0; }
.scrub-chips:empty { padding: 0; }
.scrub-chips:not(:empty) + .row { border-top: 1px solid var(--hairline); }
.scrub-chip {
  display: inline-flex; align-items: center; gap: 5px;
  background: rgba(0, 122, 255, 0.10);
  border-radius: 12px;
  padding: 4px 6px 4px 11px;
  font-size: 12px; color: var(--accent);
}
.chip-del {
  display: flex; align-items: center; justify-content: center;
  width: 18px; height: 18px;
  background: rgba(0,0,0,0.08); border: none; border-radius: 50%;
  color: var(--text-2); cursor: pointer; font-size: 13px; line-height: 1;
  flex-shrink: 0;
}
.chip-del:hover { background: rgba(255, 59, 48, 0.15); color: #FF3B30; }
.scrub-add-row { gap: 8px; }
.scrub-add-row .scrub-text { flex: 1; min-width: 0; }

/* ═══════════ MODALS ═══════════ */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: grid; place-items: center;
  z-index: 100;
  animation: fadein 0.15s ease;
}
.modal {
  width: 520px;
  max-height: 82vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  border-radius: 16px;
  box-shadow: var(--shadow-float);
  overflow: hidden;
  animation: pop 0.2s cubic-bezier(0.2, 1.2, 0.4, 1);
}
@keyframes pop { from { opacity: 0; transform: scale(0.96); } to { opacity: 1; transform: none; } }
.modal.narrow { width: 400px; }

.modal-head { padding: 20px 22px 6px; display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.modal-head-text { min-width: 0; }
.modal-title { font-size: 17px; font-weight: 700; letter-spacing: -0.2px; }
.modal-sub { font-size: 12px; color: var(--text-2); margin-top: 5px; line-height: 1.5; }
.modal-close-btn {
  width: 28px; height: 28px; flex-shrink: 0;
  border: none; border-radius: 50%;
  background: var(--fill-tert);
  color: var(--text-2);
  font-size: 13px;
  cursor: pointer;
  display: grid; place-items: center;
  transition: background 0.12s, color 0.12s;
}
.modal-close-btn:hover { background: var(--fill-sec); color: var(--text); }

.modal-tools { display: flex; gap: 8px; padding: 12px 22px 4px; }

.modal-list {
  flex: 1;
  overflow-y: auto;
  margin: 10px 16px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}
.chap-item {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 14px;
  cursor: pointer;
  font-size: 13px;
}
.chap-item + .chap-item { border-top: 1px solid var(--hairline); }
.chap-item:hover { background: var(--fill-quart); }
.chap-check {
  width: 22px; height: 22px; flex-shrink: 0;
  border: 1.5px solid var(--text-3);
  border-radius: 50%;
  display: grid; place-items: center;
  transition: all 0.13s ease;
}
.chap-item.on .chap-check {
  background: var(--accent);
  border-color: var(--accent);
}
.chap-item.on .chap-check::after {
  content: "";
  width: 6px; height: 10px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translate(-1px, -1px);
}
.chap-num { color: var(--text-3); font-variant-numeric: tabular-nums; min-width: 22px; }
.chap-title-input {
  flex: 1; min-width: 0;
  font-family: var(--font); font-size: 13px; color: var(--text);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 4px 6px;
  cursor: text;
}
.chap-title-input:hover { border-color: var(--hairline-strong); }
.chap-title-input:focus { border-color: var(--accent); background: var(--card); outline: none; }
.chap-remove-btn {
  width: 22px; height: 22px; flex-shrink: 0;
  border: none; border-radius: 50%;
  background: transparent;
  color: var(--text-3);
  font-size: 12px;
  cursor: pointer;
  display: grid; place-items: center;
  transition: background 0.12s, color 0.12s;
}
.chap-remove-btn:hover { background: rgba(255, 59, 48, 0.12); color: var(--red); }

.modal-actions { padding: 8px 16px 16px; }
.modal-actions.two { display: flex; gap: 10px; padding: 14px 22px 20px; }

#preset-name-input { flex: 1; min-width: 0; }
.preset-item {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px;
  font-size: 13px;
}
.preset-item + .preset-item { border-top: 1px solid var(--hairline); }
.preset-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.preset-meta { font-size: 11px; color: var(--text-3); flex-shrink: 0; }
.preset-actions { display: flex; gap: 4px; flex-shrink: 0; }
.btn.danger:hover:not(:disabled) { background: rgba(255, 59, 48, 0.13); color: var(--red); }
.preset-empty { padding: 16px 14px; font-size: 13px; color: var(--text-3); text-align: center; }
.modal-actions.two .btn { flex: 1; }
.modal-actions.stack { display: flex; flex-direction: column; gap: 8px; padding: 16px 22px 20px; }
.modal-actions .btn.block { width: 100%; margin: 0; }
.modal-body { padding: 12px 22px 4px; }

#cover-preview {
  display: block;
  max-width: 130px; max-height: 190px;
  margin: 0 auto 14px;
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
}
.cover-fields .pair {
  display: grid;
  grid-template-columns: auto 1fr auto 1fr;
  gap: 8px; align-items: center;
  margin-bottom: 10px;
}
.cover-fields .pair label { font-size: 12px; color: var(--text-2); }
.cover-fields .num { width: 100%; }
.hint { font-size: 11px; color: var(--text-3); margin-top: 10px; line-height: 1.5; }

/* Toast */
#toast {
  position: fixed;
  bottom: 84px; left: 50%;
  transform: translateX(-50%);
  background: rgba(28, 28, 30, 0.92);
  backdrop-filter: blur(10px);
  color: #fff;
  font-size: 13px; font-weight: 500;
  padding: 11px 20px;
  border-radius: 12px;
  box-shadow: var(--shadow-float);
  z-index: 200;
  animation: toastin 0.25s cubic-bezier(0.2, 1.2, 0.4, 1);
  max-width: 70vw;
}
#toast.err { background: rgba(215, 45, 40, 0.94); }
@keyframes toastin { from { opacity: 0; transform: translate(-50%, 10px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* Scrollbars */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-thumb { background: rgba(0, 0, 0, 0.16); border-radius: 5px; border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: rgba(0, 0, 0, 0.28); border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-track { background: transparent; }

/* ═══════════════════════════════════════════════════════════════
   Canvas preview, drop-zone, file list, orientation buttons, and the
   conversion/export progress overlay.
   ═══════════════════════════════════════════════════════════════ */

/* Toolbar: two-line book identity + drop-zone-as-button */
.tb-file.tb-author { font-size: 10px; color: var(--text-3); margin-top: 0; }

#dropZone { display: flex; align-items: center; justify-content: center; cursor: pointer; }
#dropZone.drag-over { background: var(--accent-press); }

.file-list:empty { display: none; }
.file-list {
  margin: 10px 16px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.file-item {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px;
  background: var(--card);
  border-radius: 10px;
  box-shadow: var(--shadow-card);
  padding: 8px 12px;
  font-size: 12px;
}
.file-item.active { background: rgba(0, 122, 255, 0.10); }
.file-item .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; cursor: pointer; }
.file-item .remove { background: none; border: none; color: var(--text-3); cursor: pointer; padding: 2px 6px; font-size: 14px; }
.file-item .remove:hover { color: var(--red); }

/* Canvas preview, scaled via --preview-scale (set from the Monitor DPI
   control in app.js). `zoom` (not `transform: scale`) so the element's
   layout box shrinks along with its visual size — otherwise #paper
   reserves the canvas's full unscaled 480x800 box and the actual
   (smaller) rendered content ends up floating in a sea of white, easy
   to miss against the light background. */
#previewCanvas {
  display: block;
  background: #fff;
  zoom: var(--preview-scale, 0.44);
}

/* Orientation buttons toggle a literal .active class (rather than the
   .on class used elsewhere) — give it the same look as .seg button.on */
.orientation-buttons button.active {
  background: var(--card);
  font-weight: 600;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12), 0 3px 8px rgba(0, 0, 0, 0.04);
}

/* Conversion / export progress overlay — app.js toggles this container's
   style.display directly. */
/* app.js toggles this with style.display = 'block'/'none' (not flex),
   so #export-card is centered via absolute positioning instead of a
   flex/grid parent — that way it works regardless of which display
   value ends up on the container. */
#progressContainer {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 200;
}
#progressContainer #export-card {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}
#progressText {
  font-size: 15px; font-weight: 600; color: var(--text);
  margin-bottom: 18px; letter-spacing: -0.01em;
}

/* ═══════════ MOBILE / RESPONSIVE ═══════════
   Below 860px the two side panels go off-canvas (fixed width, slid out
   via transform) instead of permanently eating into the preview's
   width, and are opened one at a time with the floating toggle buttons
   + backdrop below. Desktop layout is untouched outside the media
   query — the toggles are display:none there, so they never fire. */
.mobile-side-toggle {
  display: none;
  position: absolute;
  top: 12px;
  z-index: 40;
  width: 38px; height: 38px;
  border: none; border-radius: 50%;
  background: var(--card);
  color: var(--text);
  font-size: 16px;
  align-items: center; justify-content: center;
  box-shadow: var(--shadow-float);
  cursor: pointer;
}
.mobile-side-toggle-left { left: 12px; }
.mobile-side-toggle-right { right: 12px; }

#mobile-backdrop {
  display: none;
  position: absolute; inset: 0;
  background: rgba(0, 0, 0, 0.32);
  z-index: 45;
}

@media (max-width: 860px) {
  /* Toolbar becomes 3 rows: (1) lang toggle + title + coffee,
     (2) Import / Presets / Export together, (3) Monitor DPI (full
     width, so the slider isn't squeezed). .tb-actions/.tb-right stay
     real flex containers on desktop but "unwrap" here via
     display:contents so their children can be individually ordered as
     direct #toolbar flex items — a flex-basis:100% item always starts
     a fresh row. */
  #toolbar { flex-wrap: wrap; padding: 10px 14px; gap: 10px; }
  .tb-actions, .tb-right { display: contents; }

  .lang-toggle  { order: 1; }
  .tb-identity  { order: 2; flex: 1 1 auto; min-width: 0; }
  .tb-coffee    { order: 3; }
  #dropZone     { order: 4; }
  #btn-presets  { order: 5; }
  #exportBtn    { order: 6; }
  .zoom-box     { order: 7; flex-basis: 100%; width: 100%; }
  .zoom-box input[type="range"] { flex: 1; width: auto; }

  /* Import / Presets / Export share row 2 — smaller so all three
     (plus the full "Export XTC" label, kept unshortened on purpose to
     avoid confusion) fit without wrapping on narrow phones. */
  #dropZone, #btn-presets, #exportBtn {
    height: 32px; padding: 0 12px; font-size: 12px; border-radius: 8px;
  }

  .tb-file { max-width: 60vw; }

  .mobile-side-toggle { display: flex; }
  body.no-book .mobile-side-toggle { display: none; }
  #mobile-backdrop.show { display: block; }

  .side {
    position: absolute;
    top: 0; bottom: 0;
    width: min(86vw, 340px);
    z-index: 50;
    box-shadow: var(--shadow-float);
    transition: transform 0.25s ease;
  }
  #side-left  { left: 0; transform: translateX(-100%); border-right: none; }
  #side-right { right: 0; transform: translateX(100%); border-left: none; }
  #side-left.open, #side-right.open { transform: translateX(0); }

  /* Pagerbar becomes 2 guaranteed rows the instant mobile kicks in —
     .pager-nav-row and .pager-tools-row stop being display:contents
     and become real flex rows in their own right, stacked via
     .pager-row switching to flex-direction:column. This is structural
     (DOM grouping), not organic flex-wrap reflow, so the split doesn't
     depend on how narrow the viewport gets. */
  .pager-row { flex-direction: column; align-items: center; gap: 10px; }
  .pager-nav-row, .pager-tools-row {
    display: flex; flex-wrap: nowrap; align-items: center;
    justify-content: center; gap: 10px; width: 100%;
  }

  #pageSlider { order: 1; flex: 1 1 0%; min-width: 60px; max-width: none; }
  .pager-pill { order: 2; flex-shrink: 0; }

  #chapterSelect { order: 1; flex-shrink: 1; min-width: 60px; max-width: 130px; }
  #exportPageBtn { order: 2; flex-shrink: 0; }
  #btn-del-page  { order: 3; flex-shrink: 0; }

  #pagerbar { height: auto; min-height: 66px; padding: 10px 16px; }

  /* Delete becomes a regular labeled button here (icon + "Delete"),
     matching Export Page, instead of desktop's icon-only circle. */
  #btn-del-page {
    width: auto; height: 32px;
    padding: 0 12px; border-radius: 8px;
    display: inline-flex; align-items: center; gap: 6px;
    background: rgba(255, 59, 48, 0.13); color: var(--red);
    font-size: 12px; font-weight: 600;
  }
  #btn-del-page .del-emoji { font-size: 13px; }
  .del-label { display: inline; }
}