/**
 * NOTEBOOK-VIEWER.CSS
 * ===================
 * Dual-pane manuscript reader for DiscoveringDaVinci.com.
 * Left panel: folio image + controls.
 * Right panel: translation + commentary.
 */

/* ── Shell & Layout ─────────────────────────────── */

.nv-page {
  background: var(--color-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.nv-topbar {
  position: sticky;
  top: 0;
  z-index: 200;
  height: 48px;
  background: rgba(12, 12, 12, 0.96);
  border-bottom: 1px solid rgba(212, 175, 55, 0.2);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  font-family: var(--font-ui);
  font-size: 0.78rem;
}

.nv-topbar__back {
  color: var(--color-accent-primary);
  text-decoration: none;
  white-space: nowrap;
}

.nv-topbar__back:hover {
  text-decoration: underline;
}

.nv-topbar__crumb {
  color: var(--color-text-tertiary);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nv-topbar__crumb a {
  color: var(--color-text-tertiary);
  text-decoration: none;
}

.nv-topbar__crumb a:hover {
  color: var(--color-accent-primary);
}

.nv-topbar__sep {
  margin: 0 4px;
  opacity: 0.4;
}

.nv-topbar__nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nv-topbar__btn {
  border: 1px solid #333;
  background: #1a1a1a;
  color: var(--color-text-secondary);
  border-radius: 4px;
  padding: 4px 10px;
  font-family: var(--font-ui);
  font-size: 0.72rem;
  cursor: pointer;
  transition: border-color 120ms, color 120ms;
}

.nv-topbar__btn:hover {
  border-color: rgba(212, 175, 55, 0.5);
  color: var(--color-accent-primary);
}

.nv-topbar__btn:disabled {
  opacity: 0.35;
  cursor: default;
}

.nv-topbar__counter {
  color: var(--color-text-tertiary);
  font-size: 0.72rem;
  padding: 0 6px;
  white-space: nowrap;
}

/* ── Dual Pane ──────────────────────────────────── */

.nv-panes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  flex: 1;
  min-height: 0;
  height: calc(100vh - 48px);
}

@media (max-width: 780px) {
  .nv-panes {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 100vh;
  }
}

/* ── Left pane: folio image ─────────────────────── */

.nv-folio-pane {
  border-right: 1px solid rgba(212, 175, 55, 0.15);
  display: flex;
  flex-direction: column;
  background: #050505;
  overflow: hidden;
}

.nv-folio-pane__header {
  padding: 10px 14px 8px;
  border-bottom: 1px solid #1a1a1a;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.nv-folio-pane__label {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  color: var(--color-accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.nv-folio-pane__id {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--color-text-tertiary);
}

.nv-folio-pane__zoom {
  margin-left: auto;
  display: flex;
  gap: 4px;
}

.nv-zoom-btn {
  border: 1px solid #2a2a2a;
  background: transparent;
  color: #888;
  width: 26px;
  height: 26px;
  border-radius: 4px;
  font-size: 0.8rem;
  cursor: pointer;
  display: grid;
  place-items: center;
}

.nv-zoom-btn:hover {
  border-color: #444;
  color: #ccc;
}

.nv-folio-pane__img-wrap {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.nv-folio-pane__img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border: 1px solid #1e1e1e;
  border-radius: 4px;
  transition: transform 200ms ease;
  transform-origin: center center;
}

.nv-folio-pane__img--zoom-2 { transform: scale(1.5); }
.nv-folio-pane__img--zoom-3 { transform: scale(2.5); }

.nv-folio-pane__placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px 20px;
  color: var(--color-text-tertiary);
  text-align: center;
}

.nv-folio-pane__placeholder-icon {
  font-size: 2.5rem;
  opacity: 0.25;
}

.nv-folio-pane__placeholder-text {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  line-height: 1.5;
  max-width: 200px;
}

.nv-folio-pane__credit {
  padding: 7px 14px;
  border-top: 1px solid #181818;
  font-family: var(--font-ui);
  font-size: 0.68rem;
  color: #555;
}

.nv-folio-pane__credit a {
  color: #666;
  text-decoration: none;
}

.nv-folio-pane__credit a:hover {
  color: var(--color-accent-primary);
  text-decoration: underline;
}

/* ── Right pane: translation ────────────────────── */

.nv-text-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.nv-text-pane__header {
  padding: 10px 18px 8px;
  border-bottom: 1px solid #1a1a1a;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.nv-text-pane__label {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  color: #666;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.nv-text-pane__translator {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--color-text-tertiary);
  margin-left: auto;
}

.nv-text-pane__scroll {
  flex: 1;
  overflow-y: auto;
  padding: 20px 22px 32px;
  scroll-behavior: smooth;
}

/* ── Passage card ───────────────────────────────── */

.nv-passage {
  margin-bottom: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid #1c1c1c;
}

.nv-passage:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.nv-passage__num {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  color: var(--color-accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.nv-passage__subject {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--color-text-primary);
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.3;
}

.nv-passage__text {
  font-family: var(--font-body);
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
}

.nv-passage__text p {
  margin: 0 0 0.8em;
}

.nv-passage__text p:last-child {
  margin-bottom: 0;
}

.nv-passage__footnote {
  margin-top: 10px;
  padding: 8px 12px;
  border-left: 2px solid #2a2a2a;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: #777;
  line-height: 1.55;
}

.nv-passage__commentary {
  margin-top: 12px;
  padding: 10px 14px;
  background: rgba(212, 175, 55, 0.06);
  border: 1px solid rgba(212, 175, 55, 0.2);
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: #c8c8c8;
  line-height: 1.6;
}

.nv-passage__commentary::before {
  content: "— D  ";
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--color-accent-primary);
  letter-spacing: 0.06em;
  font-weight: 600;
}

.nv-passage__tags {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.nv-tag {
  border: 1px solid #2b2b2b;
  border-radius: 999px;
  padding: 2px 8px;
  font-family: var(--font-ui);
  font-size: 0.64rem;
  color: #888;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Codex info sidebar in passage pane ─────────── */

.nv-codex-info {
  margin-bottom: 24px;
  padding: 14px 16px;
  background: #0e0e0e;
  border: 1px solid #222;
  border-radius: 8px;
}

.nv-codex-info__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}

.nv-codex-info__sub {
  font-family: var(--font-ui);
  font-size: 0.76rem;
  color: var(--color-text-tertiary);
  margin-bottom: 10px;
}

.nv-codex-info__pills {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.nv-codex-info__pill {
  border: 1px solid #2e2e2e;
  border-radius: 4px;
  padding: 3px 8px;
  font-family: var(--font-ui);
  font-size: 0.68rem;
  color: #999;
}

.nv-codex-info__pill strong {
  color: #ccc;
  font-weight: 500;
}

/* ── Empty state ────────────────────────────────── */

.nv-empty {
  padding: 48px 22px;
  text-align: center;
  color: var(--color-text-tertiary);
  font-family: var(--font-ui);
  font-size: 0.84rem;
  line-height: 1.6;
}

/* ── Mobile stack ───────────────────────────────── */

@media (max-width: 780px) {
  .nv-folio-pane {
    border-right: none;
    border-bottom: 1px solid rgba(212, 175, 55, 0.15);
    height: 50vw;
    min-height: 260px;
    max-height: 400px;
  }

  .nv-text-pane {
    height: auto;
    min-height: 0;
  }

  .nv-text-pane__scroll {
    max-height: none;
    overflow-y: visible;
  }

  .nv-topbar__crumb {
    display: none;
  }
}