:root { --indigo: #1E2B4F; --indigo-deep: #141D38; --marigold: #E3A21A; --white: #fff; }
* { box-sizing: border-box; }
html, body { height: 100%; }
body.reader {
  margin: 0; display: flex; flex-direction: column; height: 100dvh;
  background: radial-gradient(ellipse at center, #2A3A66 0%, var(--indigo-deep) 75%);
  color: var(--white); font-family: "Manrope", "Segoe UI", system-ui, -apple-system, sans-serif; font-size: 1rem;
}
.reader-bar { display: flex; align-items: center; gap: 1rem; padding: 0.6rem 1rem; background: var(--indigo-deep); border-bottom: 2px solid var(--marigold); }
.reader-bar h1 { flex: 1; margin: 0; font-size: 1.15rem; font-weight: 700; text-align: center; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.reader-back, .reader-link { color: var(--marigold); text-decoration: none; white-space: nowrap; }
.reader-back:hover, .reader-link:hover { text-decoration: underline; }
.reader-tools { display: flex; align-items: center; gap: 0.9rem; }
.reader-btn {
  font: inherit; cursor: pointer; border: 1.5px solid var(--marigold); background: transparent; color: var(--white);
  padding: 0.4rem 1rem; border-radius: 4px;
}
.reader-btn:hover:not([disabled]) { background: var(--marigold); color: var(--indigo); }
.reader-btn[disabled] { opacity: 0.4; cursor: not-allowed; }
:focus-visible { outline: 3px solid var(--marigold); outline-offset: 2px; }

.reader-stage { flex: 1; min-height: 0; display: grid; place-items: center; padding: 0.75rem 4.2rem; position: relative; overflow: hidden; }
.reader-status { text-align: center; max-width: 30rem; margin: 0; }
.book { width: 100%; height: 100%; max-width: 1400px; }
.book .page { background: #fff; overflow: hidden; }
.book canvas { display: block; width: 100%; height: 100%; }
.book .page.is-blank::after { content: "Loading page…"; position: absolute; inset: 0; display: grid; place-items: center; color: #8a8f9f; font-size: 0.95rem; }

.reader-controls { display: flex; justify-content: center; align-items: center; gap: 1.2rem; padding: 0.7rem 1rem; background: var(--indigo-deep); border-top: 1px solid rgba(255,255,255,0.15); flex-wrap: wrap; }
.reader-jump { display: flex; align-items: center; gap: 0.5rem; }
.reader-jump input { width: 5rem; font: inherit; padding: 0.3rem 0.5rem; border-radius: 4px; border: 1.5px solid var(--marigold); background: var(--indigo); color: var(--white); text-align: center; }

@media (max-width: 640px) {
  .reader-bar { flex-wrap: wrap; justify-content: space-between; }
  .reader-bar h1 { order: 3; flex-basis: 100%; }
  #reader-full { display: none; }
}

.book { filter: drop-shadow(0 18px 28px rgba(0,0,0,0.55)); }
.side-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 5;
  width: 3rem; height: 5rem; border: 0; border-radius: 6px; cursor: pointer;
  background: rgba(255,255,255,0.12); color: var(--white); font-size: 3rem; line-height: 1; padding: 0 0 0.35rem;
}
.side-arrow:hover:not([disabled]) { background: var(--marigold); color: var(--indigo); }
.side-arrow[disabled] { opacity: 0.2; cursor: default; }
.side-arrow--prev { left: 0.6rem; }
.side-arrow--next { right: 0.6rem; }
.book[hidden] ~ .side-arrow, .reader-status:not([hidden]) ~ .side-arrow { visibility: hidden; }
@media (max-width: 640px) {
  .reader-stage { padding: 0.5rem 0.4rem; }
  .side-arrow { display: none; }
}