:root {
  --pdf-w: clamp(340px, 40vw, 600px);
}

/* ── pane ─────────────────────────────────────────────────── */
.pdf-pane {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--pdf-w);
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border-left: 1px solid var(--rule);
  z-index: 40;
  transform: translateX(100%);
  transition:
    transform 0.5s cubic-bezier(0.22, 1, 0.36, 1),
    visibility 0s linear 0.5s;
  visibility: hidden;
  outline: none;
}

.pdf-pane[data-open='true'] {
  transform: translateX(0);
  visibility: visible;
  transition:
    transform 0.5s cubic-bezier(0.22, 1, 0.36, 1),
    visibility 0s linear 0s;
}

/* ── header ───────────────────────────────────────────────── */
.pdf-pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--rule);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(6px);
  flex-shrink: 0;
}

.pdf-pane-title {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pdf-pane-controls {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

/* ── buttons ──────────────────────────────────────────────── */
.pdf-btn {
  background: none;
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  cursor: pointer;
  line-height: 1.4;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.pdf-btn:hover:not(:disabled) {
  color: var(--ink);
  border-color: var(--ink-soft);
}
.pdf-btn:disabled {
  opacity: 0.3;
  cursor: default;
}
.pdf-close {
  font-size: 1rem;
  line-height: 1;
  padding: 0.15rem 0.45rem;
}

.pdf-page-readout {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  white-space: nowrap;
  padding: 0 0.15rem;
}

.pdf-auto-pill {
  background: none;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.pdf-auto-pill.on {
  color: var(--accent);
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--paper));
}
.pdf-auto-pill:hover { opacity: 0.85; }

/* ── scroll area ──────────────────────────────────────────── */
.pdf-pane-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 1rem 1rem 2rem;
  display: flex;
  justify-content: center;
  scroll-behavior: smooth;
}

.pdf-page canvas {
  max-width: 100%;
  height: auto !important;
  display: block;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
}

.pdf-loading {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
  padding: 3rem 1rem;
  text-align: center;
}
.pdf-error { color: #c0392b; }

/* ── mobile: full-screen bottom sheet ────────────────────── */
@media (max-width: 1024px) {
  .pdf-pane {
    width: 100vw;
    height: 92dvh;
    top: auto;
    bottom: 0;
    right: 0;
    border-left: none;
    border-top: 1px solid var(--rule);
    border-radius: 12px 12px 0 0;
    transform: translateY(100%);
    transition:
      transform 0.5s cubic-bezier(0.22, 1, 0.36, 1),
      visibility 0s linear 0.5s;
  }
  .pdf-pane[data-open='true'] {
    transform: translateY(0);
    transition:
      transform 0.5s cubic-bezier(0.22, 1, 0.36, 1),
      visibility 0s linear 0s;
  }
}

/* ── reduced motion ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .pdf-pane,
  .pdf-pane[data-open='true'] {
    transition: visibility 0s linear 0s;
  }
}