.reader-body { background: var(--project-surface); }

.reader-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 6.5rem;
  padding: 1rem clamp(1.25rem, 5vw, 5rem);
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}

.reader-brand { display: block; width: clamp(10rem, 16vw, 14rem); flex: none; }
.reader-brand img { display: block; width: 100%; height: auto; }
.reader-header nav { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: center; }
.reader-header nav a { display: inline-flex; min-height: 2.75rem; align-items: center; gap: .5rem; font-size: .8rem; font-weight: 700; text-decoration: none; }
.reader-header nav a:hover { color: var(--blue); }
.reader-header svg,
.reader-footer svg,
.reader-controls svg {
  width: 1.2rem;
  height: 1.2rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.reader-pdf-link svg,
.reader-footer svg { width: 1rem; height: 1rem; }

.reader-main { max-width: 100rem; margin: 0 auto; padding: clamp(2.5rem, 5vw, 5rem) clamp(1.25rem, 5vw, 5rem) 4rem; }
.reader-intro { display: flex; justify-content: space-between; gap: 2rem; align-items: end; margin-bottom: 3rem; }
.reader-intro h1 { max-width: 12ch; margin: 0; font-size: clamp(3rem, 5.6vw, 5.5rem); line-height: .93; letter-spacing: -.04em; }
.reader-intro h1 span { color: var(--red); }
.reader-intro p { max-width: 53ch; margin: 1.35rem 0 0; color: var(--mobile-ink); font-size: 1.08rem; line-height: 1.5; }
.reader-intro > span { flex: none; padding-bottom: .35rem; font-size: .72rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.reader-intro i { display: inline-block; width: 1.5rem; height: 2px; margin: 0 .5rem .2rem; background: var(--yellow); }

.reader-layout { display: grid; grid-template-columns: minmax(12rem, .25fr) minmax(0, 1fr); gap: clamp(2rem, 4vw, 4rem); align-items: start; }
.reader-contents { position: sticky; top: 2rem; padding-top: .85rem; border-top: 2px solid var(--navy); }
.reader-contents h2 { margin: 0 0 1.5rem; font-size: 1.05rem; }
.reader-chapters { border-top: 1px solid var(--rule); }
.reader-chapters button {
  display: flex;
  width: 100%;
  min-height: 3.4rem;
  align-items: center;
  gap: 1rem;
  padding: .75rem .15rem;
  border: 0;
  border-bottom: 1px solid var(--rule);
  background: transparent;
  color: var(--navy);
  font: 700 .9rem "Guner Ubuntu", sans-serif;
  text-align: left;
  cursor: pointer;
}
.reader-chapters button span { width: 1.5rem; color: var(--blue); font-size: .7rem; letter-spacing: .07em; }
.reader-chapters button[aria-current] { color: var(--red); }
.reader-chapters button[aria-current] span { color: var(--red); }
.reader-chapters button:hover { color: var(--blue); }
.reader-contents > p { max-width: 24ch; margin: 2rem 0 0; color: var(--mobile-ink); font-size: .78rem; line-height: 1.55; }

.reader-workspace { min-width: 0; }
.reader-controls { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.reader-controls-top { margin-bottom: .75rem; }
.reader-pagination,
.reader-zoom { display: inline-flex; align-items: center; gap: .6rem; }
.reader-controls button {
  display: inline-flex;
  min-width: 2.9rem;
  min-height: 2.9rem;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .45rem .75rem;
  border: 1px solid var(--navy);
  background: var(--paper);
  color: var(--navy);
  font: 700 .8rem "Guner Ubuntu", sans-serif;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease;
}
.reader-controls button:hover:not(:disabled) { background: var(--navy); color: #fff; }
.reader-controls button:disabled { opacity: .42; cursor: not-allowed; }
.reader-pagination > span { min-width: 7.4rem; font-size: .8rem; font-weight: 700; text-align: center; }
.reader-zoom > span { min-width: 2.7rem; font-size: .75rem; font-weight: 700; text-align: center; }

.reader-viewport {
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: clamp(.8rem, 2vw, 1.5rem);
  background: #dce5ed;
  scrollbar-color: var(--navy) #dce5ed;
}
.reader-leaf { width: min(100%, 46rem); margin: 0 auto; background: #fff; box-shadow: 12px 17px 34px rgba(5,20,38,.18); }
.reader-leaf img { display: block; width: 100%; height: auto; aspect-ratio: 1300 / 1839; background: #fff; }
.reader-leaf img.is-changing { animation: reader-page-settle 300ms cubic-bezier(.16,1,.3,1) both; }
.reader-image-error { margin: 1rem 0; padding: 1rem; background: #fff; color: var(--red); line-height: 1.5; }
.reader-image-error a { color: var(--navy); font-weight: 700; }

.reader-page-copy { max-width: 46rem; padding: 2rem 0 2.5rem; }
.reader-page-copy > span { color: var(--blue); font-size: .7rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; }
.reader-page-copy h2 { margin: .65rem 0 0; font-size: clamp(1.8rem, 3vw, 2.8rem); line-height: 1; letter-spacing: -.03em; }
.reader-page-copy p { max-width: 62ch; margin: .75rem 0 0; color: var(--mobile-ink); line-height: 1.55; }
.reader-controls-bottom { padding: 1rem 0 0; border-top: 1px solid var(--rule); }
.reader-controls-bottom button { min-width: 8rem; }

.reader-footer { display: flex; justify-content: space-between; align-items: center; gap: 1.5rem; margin-top: 4rem; padding-top: 1.25rem; border-top: 2px solid var(--navy); }
.reader-footer p { margin: 0; color: var(--mobile-ink); line-height: 1.5; }
.reader-footer p a { color: var(--navy); font-weight: 700; }
.reader-footer > a { display: inline-flex; min-height: 2.75rem; align-items: center; gap: .75rem; flex: none; font-weight: 700; text-decoration: none; }
.reader-footer > a:hover { color: var(--red); }
.reader-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }

@keyframes reader-page-settle { from { opacity: .55; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 760px) {
  .reader-header { align-items: flex-start; min-height: 0; padding: .75rem 1.25rem; }
  .reader-brand { width: 8.5rem; }
  .reader-header nav { justify-content: flex-end; gap: .15rem; }
  .reader-header nav a { min-height: 2.2rem; font-size: .7rem; }
  .reader-back { white-space: nowrap; }
  .reader-main { padding: 2.5rem 1.25rem 3rem; }
  .reader-intro { display: block; margin-bottom: 2rem; }
  .reader-intro h1 { font-size: clamp(2.6rem, 11vw, 3.7rem); }
  .reader-intro p { margin-top: 1rem; font-size: .95rem; }
  .reader-intro > span { display: block; margin-top: 1.5rem; }
  .reader-layout { min-width: 0; grid-template-columns: minmax(0, 1fr); gap: 1.5rem; }
  .reader-contents { position: static; min-width: 0; padding-top: .75rem; }
  .reader-contents h2 { margin-bottom: .75rem; font-size: .9rem; }
  .reader-chapters { display: flex; overflow-x: auto; gap: .35rem; padding-bottom: .4rem; border: 0; scrollbar-color: var(--navy) transparent; }
  .reader-chapters button { width: auto; min-height: 2.75rem; gap: .5rem; flex: none; padding: .5rem .7rem; border: 1px solid var(--rule); background: #fff; font-size: .75rem; white-space: nowrap; }
  .reader-chapters button[aria-current] { border-color: var(--red); }
  .reader-chapters button span { width: auto; }
  .reader-contents > p { display: none; }
  .reader-controls-top { flex-direction: column; align-items: stretch; gap: .6rem; }
  .reader-pagination,
  .reader-zoom { gap: .25rem; }
  .reader-pagination { display: grid; width: 100%; min-width: 0; grid-template-columns: 2.75rem minmax(0, 1fr) 2.75rem; gap: .5rem; }
  .reader-pagination > span { min-width: 0; align-self: center; }
  .reader-zoom { display: flex; width: 100%; justify-content: flex-end; }
  .reader-controls button { min-width: 2.75rem; min-height: 2.75rem; padding: .35rem; }
  .reader-pagination > span { min-width: 6.7rem; font-size: .72rem; }
  .reader-zoom > span { min-width: 2.3rem; font-size: .68rem; }
  .reader-viewport { padding: .6rem; }
  .reader-leaf { max-width: none; }
  .reader-page-copy { padding: 1.5rem 0 2rem; }
  .reader-page-copy h2 { font-size: 2rem; }
  .reader-page-copy p { font-size: .95rem; }
  .reader-footer { display: block; margin-top: 3rem; }
  .reader-footer > a { margin-top: 1.25rem; }
}

@media (max-width: 375px) {
  .reader-header { display: block; }
  .reader-header nav { justify-content: space-between; margin-top: .2rem; }
  .reader-controls-top { flex-wrap: nowrap; }
}

@media (prefers-reduced-motion: reduce) {
  .reader-leaf img.is-changing { animation: none; }
}