.reading-hero {
  padding-bottom: 34px;
}

.reading-hero h1 {
  font-size: clamp(2.8rem, 7vw, 6rem);
}

.reading-layout {
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: 28px;
  align-items: start;
  padding-top: 20px;
}

.reading-sidebar {
  position: sticky;
  top: 140px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.045);
  border-radius: 24px;
  padding: 14px;
  display: grid;
  gap: 8px;
}

.reading-sidebar a {
  padding: 12px 14px;
  border-radius: 16px;
  color: var(--muted);
  font-weight: 800;
}

.reading-sidebar a:hover {
  background: rgba(51, 209, 96, 0.09);
  color: var(--text);
}

.reading-content {
  display: grid;
  gap: 42px;
}

.reading-section {
  scroll-margin-top: 150px;
}

.reading-section-title {
  margin-bottom: 20px;
}

.reading-section-title h2,
.reader-empty h2,
.reader-toolbar h2 {
  font-size: clamp(1.9rem, 4vw, 3.2rem);
}

.reading-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.reading-card,
.reading-note,
.reading-viewer-shell {
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(255,255,255,0.075), rgba(255,255,255,0.035));
  border-radius: 26px;
  padding: 24px;
}

.reading-card {
  min-height: 260px;
  display: flex;
  flex-direction: column;
}

.reading-card.is-disabled {
  opacity: 0.72;
}

.reading-card-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 18px;
}

.reading-tag {
  color: var(--gold);
  font-weight: 950;
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.reading-type {
  color: var(--green);
  background: rgba(51, 209, 96, 0.10);
  border: 1px solid rgba(51, 209, 96, 0.22);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.78rem;
  font-weight: 900;
}

.reading-card p,
.reading-note p,
.reader-empty p,
.reader-toolbar p {
  color: var(--muted);
  line-height: 1.65;
}

.reading-link {
  margin-top: auto;
  display: inline-flex;
  width: fit-content;
  padding: 11px 14px;
  border-radius: 14px;
  border: 0;
  cursor: pointer;
  color: #041008;
  background: var(--green);
  font-weight: 950;
}

.reading-link:disabled {
  background: rgba(255,255,255,0.08);
  color: var(--muted);
  cursor: not-allowed;
}

.reader-empty {
  min-height: 280px;
  display: grid;
  align-content: center;
}

.reader-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.pdf-frame {
  width: 100%;
  height: min(78vh, 860px);
  min-height: 620px;
  border-radius: 20px;
  overflow: hidden;
  background: #111;
  border: 1px solid rgba(255,255,255,0.14);
}

.pdf-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

@media (max-width: 980px) {
  .reading-layout {
    grid-template-columns: 1fr;
  }

  .reading-sidebar {
    position: static;
    grid-template-columns: repeat(3, 1fr);
    overflow-x: auto;
  }

  .reading-grid {
    grid-template-columns: 1fr;
  }

  .reader-toolbar {
    flex-direction: column;
  }
}

@media (max-width: 620px) {
  .reading-sidebar {
    grid-template-columns: 1fr;
  }

  .pdf-frame {
    min-height: 520px;
  }
}