.root {
  position: fixed; inset: 0;
  background: #000;
  display: flex; flex-direction: column;
  z-index: var(--z-reader);
  transform: translateZ(0); will-change: transform;
}

/* ── UI autohide ── */
.uiHidden {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
.topbar, .bottombar {
  transition: opacity 0.25s ease;
}

/* ── Topbar ── */
.topbar {
  display: flex; align-items: center; gap: var(--sp-1);
  padding: 0 var(--sp-3); height: 40px;
  background: var(--bg-void); border-bottom: 1px solid var(--border-dim);
  flex-shrink: 0; overflow: visible;
  position: relative; z-index: 2;
}

.iconBtn {
  display: flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: var(--radius-sm);
  color: var(--text-muted); flex-shrink: 0;
  transition: color var(--t-base), background var(--t-base);
}
.iconBtn:hover:not(:disabled) { color: var(--text-primary); background: var(--bg-raised); }
.iconBtn:disabled { opacity: 0.2; cursor: default; }

.chLabel {
  flex: 1; display: flex; align-items: center; gap: var(--sp-2);
  font-size: var(--text-sm); color: var(--text-muted);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.chTitle { color: var(--text-secondary); font-weight: var(--weight-medium); }
.chSep   { color: var(--text-faint); }

.pageLabel {
  font-family: var(--font-ui); font-size: var(--text-xs);
  color: var(--text-muted); letter-spacing: var(--tracking-wide);
  flex-shrink: 0;
}

.topSep {
  width: 1px; height: 16px;
  background: var(--border-dim); flex-shrink: 0; margin: 0 var(--sp-1);
}

.modeBtn {
  display: flex; align-items: center; gap: 4px;
  padding: 4px var(--sp-2); border-radius: var(--radius-sm);
  color: var(--text-muted); flex-shrink: 0;
  font-family: var(--font-ui); font-size: var(--text-2xs);
  letter-spacing: var(--tracking-wide);
  transition: color var(--t-base), background var(--t-base);
}
.modeBtn:hover { color: var(--text-primary); background: var(--bg-raised); }
.modeBtnActive { color: var(--accent-fg); background: var(--accent-muted); }
.modeBtnActive:hover { color: var(--accent-fg); background: var(--accent-muted); }
.modeBtnLabel { text-transform: capitalize; }

/* ── Zoom ── */
.zoomWrap {
  position: relative; flex-shrink: 0;
}

.zoomBtn {
  font-family: var(--font-ui); font-size: var(--text-2xs);
  letter-spacing: var(--tracking-wide); color: var(--text-faint);
  padding: 4px var(--sp-2); border-radius: var(--radius-sm);
  min-width: 36px; text-align: center;
  transition: color var(--t-base), background var(--t-base);
}
.zoomBtn:hover { color: var(--text-secondary); background: var(--bg-raised); }

.zoomPopover {
  position: absolute; top: calc(100% + 6px); left: 50%;
  transform: translateX(-50%);
  background: var(--bg-raised); border: 1px solid var(--border-base);
  border-radius: var(--radius-lg); padding: var(--sp-3) var(--sp-3) var(--sp-2);
  display: flex; flex-direction: column; align-items: center; gap: var(--sp-2);
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  z-index: 100; min-width: 160px;
  animation: scaleIn 0.1s ease both; transform-origin: top center;
}

.zoomSlider {
  -webkit-appearance: none;
  appearance: none;
  width: 140px; height: 3px;
  background: var(--border-strong);
  border-radius: 2px; outline: none; cursor: pointer;
}
.zoomSlider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent-fg);
  cursor: pointer;
}
.zoomSlider::-moz-range-thumb {
  width: 12px; height: 12px;
  border-radius: 50%; border: none;
  background: var(--accent-fg);
  cursor: pointer;
}

.zoomResetBtn {
  font-family: var(--font-ui); font-size: var(--text-xs);
  color: var(--text-muted); letter-spacing: var(--tracking-wide);
  padding: 2px var(--sp-2); border-radius: var(--radius-sm);
  transition: color var(--t-base), background var(--t-base);
}
.zoomResetBtn:hover { color: var(--text-primary); background: var(--bg-overlay); }

/* ── Viewer ── */
.viewer {
  flex: 1; overflow-y: auto; overflow-x: hidden;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  -webkit-overflow-scrolling: touch;
}

.viewerStrip {
  justify-content: flex-start;
  padding: var(--sp-4) 0;
}

/* ── Images ── */
.img {
  display: block; user-select: none;
  image-rendering: auto;
}
.img.optimizeContrast { image-rendering: -webkit-optimize-contrast; }

/* Fit modes */
.fitWidth    { max-width: var(--max-page-width); width: 100%; height: auto; }
.fitHeight   { max-height: calc(100vh - 80px); width: auto; max-width: 100%; }
.fitScreen   { max-width: 100%; max-height: calc(100vh - 80px); object-fit: contain; }
.fitOriginal { max-width: none; width: auto; height: auto; }

/* Longstrip */
.stripGap { margin-bottom: 8px; }

/* ── Double page ── */
.doubleWrap {
  display: flex; align-items: flex-start; justify-content: center;
  max-width: calc(var(--max-page-width) * 2);
  width: 100%;
}
.pageHalf  { flex: 1; min-width: 0; object-fit: contain; }
.gapLeft   { margin-right: 2px; }
.gapRight  { margin-left: 2px; }

/* ── Bottom nav ── */
.bottombar {
  display: flex; align-items: center; justify-content: center; gap: var(--sp-4);
  padding: var(--sp-3); border-top: 1px solid var(--border-dim);
  background: var(--bg-void); flex-shrink: 0;
}

.navBtn {
  display: flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: var(--radius-md);
  border: 1px solid var(--border-strong); color: var(--text-muted);
  transition: background var(--t-base), color var(--t-base);
}
.navBtn:hover:not(:disabled) { background: var(--bg-raised); color: var(--text-primary); }
.navBtn:disabled { opacity: 0.25; cursor: default; }

/* ── States ── */
.center {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  position: fixed; inset: 0; background: #000;
}
.errorMsg { color: var(--color-error); font-size: var(--text-base); }

/* ── Download modal ── */
.dlBackdrop {
  position: fixed; inset: 0;
  z-index: calc(var(--z-reader) + 10);
  display: flex; align-items: flex-start; justify-content: flex-end;
  padding: 48px var(--sp-4) 0;
}

.dlModal {
  background: var(--bg-raised); border: 1px solid var(--border-base);
  border-radius: var(--radius-xl); padding: var(--sp-3);
  min-width: 210px; display: flex; flex-direction: column; gap: var(--sp-1);
  box-shadow: 0 8px 32px rgba(0,0,0,0.6);
  animation: scaleIn 0.12s ease both; transform-origin: top right;
}

.dlTitle {
  font-family: var(--font-ui); font-size: var(--text-2xs);
  color: var(--text-faint); letter-spacing: var(--tracking-wider);
  text-transform: uppercase; padding: 2px var(--sp-2) var(--sp-2);
  border-bottom: 1px solid var(--border-dim); margin-bottom: var(--sp-1);
}

.dlOption {
  display: flex; flex-direction: column; align-items: flex-start; gap: 2px;
  width: 100%; padding: 7px var(--sp-3); border-radius: var(--radius-md);
  font-size: var(--text-sm); color: var(--text-secondary);
  background: none; border: none; cursor: pointer; text-align: left;
  transition: background var(--t-fast), color var(--t-fast);
}
.dlOption:hover:not(:disabled) { background: var(--bg-overlay); color: var(--text-primary); }
.dlOption:disabled { opacity: 0.3; cursor: default; }

.dlSub { font-size: var(--text-xs); color: var(--text-faint); }

.dlRow { display: flex; align-items: center; gap: var(--sp-2); }

.dlStepper {
  display: flex; align-items: center; gap: 2px;
  background: var(--bg-overlay); border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); overflow: hidden; flex-shrink: 0;
}

.dlStepBtn {
  display: flex; align-items: center; justify-content: center;
  width: 22px; height: 28px;
  font-size: var(--text-base); color: var(--text-muted);
  background: none; border: none; cursor: pointer; line-height: 1;
  transition: color var(--t-fast), background var(--t-fast);
}
.dlStepBtn:hover:not(:disabled) { color: var(--text-primary); background: var(--bg-raised); }
.dlStepBtn:disabled { opacity: 0.25; cursor: default; }

.dlStepVal {
  font-family: var(--font-ui); font-size: var(--text-xs);
  color: var(--text-secondary); min-width: 24px; text-align: center;
  letter-spacing: var(--tracking-wide);
}
/* Viewer focus — suppress outline since we're handling keys ourselves */
.viewer:focus { outline: none; }