/* ── Page shell ───────────────────────────────────────── */
.detail-page {
  padding-top: calc(var(--nav-height) + 2.5rem);
  padding-bottom: 5rem;
  min-height: 100vh;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  transition: color 0.2s;
}
.back-link:hover { color: var(--text); }
.back-link::before { content: '←'; }

/* ── Status banner ────────────────────────────────────── */
.exchange-status-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 500;
}
.status-pill::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
}
.status-pill--available { color: var(--success); background: rgba(16,185,129,0.12); border: 1px solid rgba(16,185,129,0.25); }
.status-pill--taken     { color: var(--gold);    background: var(--gold-dim);        border: 1px solid rgba(201,168,76,0.25); }
.status-pill--completed { color: var(--text-muted); background: var(--surface-2);   border: 1px solid var(--border); }

/* ── Exchange sides ───────────────────────────────────── */
.exchange-sides {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.side-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.side-card--active { border-color: rgba(201,168,76,0.3); }
.side-card--empty  { opacity: 0.5; border-style: dashed; }

.side-card__role {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.side-card__question {
  font-style: italic;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.6;
}

.side-card__question--empty {
  color: var(--text-dim);
  font-style: normal;
}

.side-card__user {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.side-card__username { font-size: 0.85rem; color: var(--text); font-weight: 500; }
.side-card__level    { font-size: 0.75rem; color: var(--text-muted); }

/* ── Reading links ────────────────────────────────────── */
.readings-section { margin-bottom: 1.5rem; }

.readings-section__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

.reading-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.reading-link-slot { margin-bottom: 0.5rem; }

.reading-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: all 0.2s;
  text-decoration: none;
}
.reading-link:hover { border-color: var(--gold); color: var(--text); }

.reading-link__thumbs {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.reading-link__thumb {
  width: 28px;
  height: 47px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid rgba(255,255,255,0.07);
}

.reading-link__thumb--reversed {
  transform: rotate(180deg);
  opacity: 0.8;
}

.reading-link__label {
  flex: 1;
}

/* ── CTA ──────────────────────────────────────────────── */
.exchange-cta {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
}
.exchange-cta h3 { margin-bottom: 0.5rem; }
.exchange-cta p  { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1.25rem; }
.exchange-cta__deadline { color: var(--text-dim); font-size: 0.8rem; margin-bottom: 1.25rem; }

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 640px) {
  .exchange-sides { grid-template-columns: 1fr; }
}

/* ── Incomplete action notice ─────────────────────────── */
.exchange-incomplete-notice {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  background: linear-gradient(135deg, rgba(124,58,237,0.08), rgba(157,110,192,0.07));
  border: 1.5px solid rgba(196,150,255,0.35);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}

.exchange-incomplete-notice__icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 0.05rem;
  color: var(--purple-light);
}

.exchange-incomplete-notice__body { flex: 1; }

.exchange-incomplete-notice__title {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--purple-light);
  margin-bottom: 0.3rem;
}

.exchange-incomplete-notice__text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 0.85rem;
}

/* ── Exchange action states ───────────────────────────── */
.exchange-done-note {
  font-size: 0.88rem;
  color: var(--success);
  font-family: var(--font-ui);
}
.exchange-prefill-info {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  background: var(--surface-2);
  border: 1px solid var(--border);
}
.exchange-prefill-info__q {
  font-style: italic;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}