/* =====================================================================
   文字档案 · 分类重设计 (/archive/docs)
   Master/detail: right rail = category index, left = reading area.
   Claude Design handoff (local/archive-docs/). All colors via tokens.css;
   loaded after archive.css. New classes are .dr-* prefixed.
   ===================================================================== */

.dr-layout {
  display: grid;
  grid-template-columns: minmax(0, 760px) 380px;   /* reader (≤760, matches detail) · rail */
  gap: 56px;
  justify-content: center;   /* center the pair — no wasted middle gap */
  align-items: start;
  margin: 8px 0 48px;
}

/* ── reader (left) ────────────────────────────────────────────────── */
.dr-reader {
  max-width: 760px;
  min-width: 0;
  /* selectDoc() does readerEl.scrollIntoView(block:'start'); offset past the
     sticky .topbar (~55px) so the doc title isn't hidden under the nav. */
  scroll-margin-top: 84px;
}
.dr-kicker {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
}
.dr-title {                       /* matches .doc-detail-title (the detail page) */
  font-family: 'Noto Serif SC', serif;
  font-weight: 600;
  line-height: 1.3;
  font-size: clamp(24px, 3.2vw, 30px);
  color: var(--ink);
  margin: 0 0 18px;
}
.dr-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 26px;
}
.dr-langs { display: inline-flex; gap: 6px; margin-right: 6px; }
.dr-lang {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border: 1px solid var(--line-2);
  border-radius: 2px;
}
.dr-lang.is-on { color: var(--ink); border-color: var(--ink-3); }
.dr-lang.is-off { color: var(--ink-3); opacity: 0.5; }
.dr-act {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-2);
  padding: 4px 10px;
  border: 1px solid var(--line-2);
  border-radius: 2px;
}
.dr-act:hover { color: var(--hot); border-color: var(--hot); }
.dr-summary {                      /* body typography matches the detail page */
  font-family: 'Noto Serif SC', serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
}
.dr-summary h2 { font-size: 17px; font-weight: 600; margin: 26px 0 10px; color: var(--ink); }
.dr-summary h3 { font-size: 15px; font-weight: 600; margin: 18px 0 6px; color: var(--ink-2); }
.dr-summary p { margin: 0 0 12px; }
.dr-summary strong { font-weight: 600; }
.dr-summary :first-child { margin-top: 0; }
.dr-meta-line {
  margin-top: 26px;
  padding-top: 14px;
  border-top: 1px dotted var(--line-2);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-3);
  line-height: 1.6;
}
.dr-meta-line .dr-id { color: var(--muted); }

/* same-series nav (court filings) */
.dr-series { margin-top: 22px; }
.dr-series-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 8px;
}
.dr-series-nav { display: flex; gap: 10px; }
.dr-series-btn {
  flex: 1;
  text-align: left;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 9px 12px;
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--ink-2);
}
.dr-series-btn:hover:not(:disabled) { border-color: var(--hot); color: var(--hot); }
.dr-series-btn:disabled { opacity: 0.4; cursor: default; }
.dr-series-btn .s-dir { display: block; font-size: 10px; color: var(--ink-3); margin-bottom: 2px; }

.dr-reader.is-empty { color: var(--muted); }
.dr-empty {
  font-family: 'Noto Serif SC', serif;
  font-size: 16px;
  color: var(--muted);
  padding: 40px 0;
}

/* ── rail (right) ─────────────────────────────────────────────────── */
.dr-rail {
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  border-left: 1px solid var(--line);
  padding-left: 24px;
}
.dr-rail-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 12px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--line);
}
.dr-rail-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  white-space: nowrap;
}
.dr-rail-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
}

/* category group */
.dr-cat { border-bottom: 1px solid var(--line); }
.dr-cat:last-child { border-bottom: 0; }
.dr-cat-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  width: 100%;
  background: none;
  border: 0;
  padding: 14px 0 10px;
  cursor: pointer;
  text-align: left;
}
.dr-cat-en {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.dr-cat-zh {
  font-family: 'Noto Serif SC', serif;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.dr-cat-n {
  margin-left: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-3);
}
.dr-cat-chev {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--muted);
  width: 12px;
  text-align: center;
}
.dr-cat-list { display: none; padding-bottom: 8px; }
.dr-cat.is-open > .dr-cat-list { display: block; }
.dr-cat-list.is-capped {
  overflow-y: auto;
  -webkit-mask-image: linear-gradient(to bottom, #000 calc(100% - 22px), transparent);
  mask-image: linear-gradient(to bottom, #000 calc(100% - 22px), transparent);
}
.dr-cat-more {
  display: block;
  width: 100%;
  background: none;
  border: 0;
  text-align: left;
  padding: 8px 0 4px;
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--muted);
}
.dr-cat-more:hover { color: var(--hot); }

/* row */
.dr-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  width: 100%;
  background: none;
  border: 0;
  border-left: 2px solid transparent;
  padding: 8px 10px;
  cursor: pointer;
  text-align: left;
}
.dr-row:hover { background: color-mix(in srgb, var(--ink) 4%, transparent); }
.dr-row.is-active {
  border-left-color: var(--hot);
  background: color-mix(in srgb, var(--hot) 8%, transparent);
}
.dr-row-title {
  flex: 1;
  min-width: 0;
  font-family: 'Noto Serif SC', serif;
  font-size: 13px;
  line-height: 1.4;
  color: var(--ink-2);
  display: -webkit-box;
  -webkit-line-clamp: 2;            /* full title, wraps to ≤2 lines (keeps Doc N) */
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.dr-row.is-active .dr-row-title { color: var(--ink); }
.dr-row-date {
  flex: 0 0 auto;
  margin-top: 2px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--ink-3);
  white-space: nowrap;
}

/* mobile back button (hidden on desktop) */
.dr-back { display: none; }

/* ── responsive · single column, list/detail mutually exclusive ───── */
@media (max-width: 760px) {
  .dr-layout { grid-template-columns: 1fr; gap: 0; }
  .dr-rail {
    position: static;
    max-height: none;
    overflow: visible;
    border-left: 0;
    padding-left: 0;
  }
  .dr-reader { max-width: none; }
  /* list view: rail only */
  .dr-layout.m-list .dr-reader { display: none; }
  /* detail view: reader only */
  .dr-layout.m-detail .dr-rail { display: none; }
  .dr-layout.m-detail .dr-back {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: none;
    border: 0;
    cursor: pointer;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--muted);
    padding: 0 0 16px;
  }
  .dr-layout.m-detail .dr-back:hover { color: var(--hot); }
}