.reader {
  width: 100vw; height: 100dvh; max-width: none; max-height: none; margin: 0; padding: 0; border: 0;
  background: var(--ink); color: var(--paper);
}
.reader[open] { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; }
.reader::backdrop { background: var(--ink); }

.reader__bar {
  display: flex; align-items: center; gap: var(--space-3); padding: 0.6rem 1rem;
  border-bottom: var(--line) solid var(--paper);
}
.reader__title { font-size: var(--step-1); margin-right: auto; }
.reader__page { margin: 0; font-family: var(--font-display); text-transform: uppercase; letter-spacing: 0.08em; }
.reader__pdf { font-size: var(--step-0); padding: 0.3rem 0.9rem 0.2rem; box-shadow: none; background: var(--paper); color: var(--ink); border-color: var(--paper); }
.reader__close {
  background: var(--paper); color: var(--ink); border: 0; width: 2.4rem; height: 2.4rem; font-size: 1.2rem; line-height: 1;
}

.reader__body { position: relative; display: grid; grid-template-rows: minmax(0, 1fr); min-height: 0; }
.reader__stage { overflow: auto; display: grid; grid-template-rows: minmax(0, 1fr); place-items: center; min-height: 0; padding: 1rem; touch-action: pan-x pan-y pinch-zoom; }
.reader__img { background: var(--paper); height: 100%; width: auto; max-width: 100%; object-fit: contain; cursor: zoom-in; }
.reader__stage.is-zoomed { place-items: start center; }
.reader__stage.is-zoomed { grid-template-rows: none; }
.reader__stage.is-zoomed .reader__img { max-width: none; height: auto; width: min(200vw, 2000px); cursor: zoom-out; }

.reader__nav {
  position: absolute; top: 50%; translate: 0 -50%; z-index: 2;
  background: var(--paper); color: var(--ink); border: var(--line) solid var(--ink);
  width: 3rem; height: 4.5rem; font-family: var(--font-display); font-size: 2.2rem; line-height: 1;
}
.reader__nav--prev { left: 0.5rem; }
.reader__nav--next { right: 0.5rem; }
.reader__nav:disabled { opacity: 0.25; cursor: default; }
.reader__hint { margin: 0; text-align: center; padding: 0.4rem 1rem 0.6rem; font-size: var(--step--1); opacity: 0.8; max-width: none; }

@media (max-width: 40rem) {
  .reader__pdf { display: none; }
  .reader__nav { width: 2.4rem; height: 3.6rem; }
}