/* css/backmatter-premium.css — refined Back Matter tab. Everything is scoped to #tab-backmatter. */

#tab-backmatter {
  --bm-ui: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --bm-surface: #ffffff;
  --bm-surface-2: #faf7f1;
  --bm-border: rgba(26, 22, 17, 0.09);
  --bm-border-strong: rgba(26, 22, 17, 0.17);
  --bm-ring: rgba(168, 52, 31, 0.14);
  --bm-accent-soft: rgba(168, 52, 31, 0.07);
  --bm-good: #1f7a4d;
  --bm-good-bg: #e3f4ea;
  --bm-warn: #9a6200;
  --bm-warn-bg: #fdf1d8;
  --bm-bad: #9b2c1b;
  --bm-bad-bg: #fbe7e3;
  --bm-radius: 14px;
  --bm-radius-sm: 10px;
  --bm-shadow: 0 1px 2px rgba(26, 22, 17, 0.04), 0 8px 24px -16px rgba(26, 22, 17, 0.18);
  font-family: var(--bm-ui);
}

body.fs-theme-dark #tab-backmatter {
  --bm-surface: var(--card);
  --bm-surface-2: #16181e;
  --bm-border: rgba(255, 255, 255, 0.07);
  --bm-border-strong: rgba(255, 255, 255, 0.14);
  --bm-ring: rgba(224, 105, 79, 0.22);
  --bm-accent-soft: rgba(224, 105, 79, 0.1);
  --bm-good: #6fd49b;
  --bm-good-bg: rgba(111, 212, 155, 0.12);
  --bm-warn: #f0c26b;
  --bm-warn-bg: rgba(240, 194, 107, 0.12);
  --bm-bad: #f08a76;
  --bm-bad-bg: rgba(240, 138, 118, 0.12);
  --bm-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px -16px rgba(0, 0, 0, 0.6);
}

#tab-backmatter > .panel-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  max-width: 1180px;
  margin: 0 auto;
}

/* ── Page header ── */
#tab-backmatter .bm-page-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px 24px;
  padding: 4px 2px 2px;
}

#tab-backmatter .bm-page-title {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink);
}

#tab-backmatter .bm-page-lead { max-width: 70ch; margin: 0; font-size: 13.5px; color: var(--muted); }

#tab-backmatter .bm-stats { display: flex; flex-wrap: wrap; gap: 6px; }

#tab-backmatter .bm-stat {
  padding: 5px 11px;
  font-size: 12px;
  color: var(--ink-soft);
  background: var(--bm-surface);
  border: 1px solid var(--bm-border);
  border-radius: 999px;
}

#tab-backmatter .bm-stat strong { font-weight: 650; color: var(--ink); font-variant-numeric: tabular-nums; }
#tab-backmatter .bm-stat--good { color: var(--bm-good); background: var(--bm-good-bg); border-color: transparent; }
#tab-backmatter .bm-stat--good strong { color: var(--bm-good); }

/* ── Section jump nav ── */
#tab-backmatter .bm-jump {
  position: sticky;
  top: 8px;
  z-index: 6;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px;
  background: color-mix(in srgb, var(--bm-surface) 88%, transparent);
  border: 1px solid var(--bm-border);
  border-radius: 12px;
  box-shadow: var(--bm-shadow);
  backdrop-filter: blur(8px);
}

#tab-backmatter .bm-jump:empty { display: none; }

#tab-backmatter .bm-jump-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  font: 600 12px var(--bm-ui);
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
}

#tab-backmatter .bm-jump-chip:hover { color: var(--ink); background: var(--bm-surface-2); border-color: var(--bm-border); }

#tab-backmatter .bm-jump-dot {
  width: 8px;
  height: 8px;
  border: 1.5px solid var(--bm-border-strong);
  border-radius: 50%;
}

#tab-backmatter .bm-jump-chip.is-filled .bm-jump-dot { background: var(--bm-good); border-color: var(--bm-good); }

/* ── Cards ── */
#tab-backmatter .card {
  padding: 22px 24px;
  background: var(--bm-surface);
  border: 1px solid var(--bm-border);
  border-radius: var(--bm-radius);
  box-shadow: var(--bm-shadow);
  scroll-margin-top: 72px;
  transition: box-shadow 0.3s;
}

#tab-backmatter .card::before { display: none; }
#tab-backmatter .card.bm-flash { box-shadow: 0 0 0 3px var(--bm-ring), var(--bm-shadow); }

body.fs-density-compact #tab-backmatter .card { padding: 16px 18px; }

#tab-backmatter .bm-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px 16px;
  margin-bottom: 14px;
}

#tab-backmatter .bm-head-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }

#tab-backmatter .card-title {
  margin-bottom: 2px;
  font-family: var(--bm-ui);
  font-size: 15.5px;
  font-weight: 650;
}

#tab-backmatter .card-hint {
  margin-bottom: 0;
  font-family: var(--bm-ui);
  font-size: 12.5px;
  font-style: normal;
  line-height: 1.55;
}

#tab-backmatter .bm-status {
  flex: none;
  padding: 2px 9px;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.6;
  white-space: nowrap;
  color: var(--muted);
  background: var(--bm-surface-2);
  border: 1px solid var(--bm-border);
  border-radius: 999px;
}

#tab-backmatter .bm-status:empty { display: none; }
#tab-backmatter .bm-status.is-filled { color: var(--bm-good); background: var(--bm-good-bg); border-color: transparent; }

/* ── Buttons ── */
#tab-backmatter .btn-primary,
#tab-backmatter .btn-ghost {
  min-height: 36px;
  padding: 7px 14px;
  border-radius: var(--bm-radius-sm);
  font-family: var(--bm-ui);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: normal;
  text-transform: none;
  white-space: nowrap;
}

#tab-backmatter .btn-ghost { background: var(--bm-surface); border-color: var(--bm-border-strong); }
#tab-backmatter .btn-ghost:hover { background: var(--bm-surface-2); }

#tab-backmatter .btn-tiny {
  min-height: 30px;
  padding: 4px 11px !important;
  font-size: 12px !important;
  border-radius: 8px;
}

body.fs-theme-dark #tab-backmatter .btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }

#tab-backmatter .bm-icon-group { display: flex; align-items: center; gap: 2px; }

#tab-backmatter .bm-icon-btn {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding: 0;
  font: 500 15px/1 var(--bm-ui);
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
}

#tab-backmatter .bm-icon-btn:hover:not(:disabled) { color: var(--ink); background: var(--bm-surface-2); border-color: var(--bm-border); }
#tab-backmatter .bm-icon-btn:disabled { opacity: 0.3; cursor: default; }
#tab-backmatter .bm-icon-btn--danger { font-size: 18px; color: var(--bm-bad); }
#tab-backmatter .bm-icon-btn--danger:hover:not(:disabled) { color: var(--bm-bad); background: var(--bm-bad-bg); border-color: transparent; }

/* ── Inputs ── */
#tab-backmatter textarea,
#tab-backmatter input[type="text"],
#tab-backmatter .rich-editor {
  width: 100%;
  min-height: 40px;
  padding: 9px 12px;
  background: var(--bm-surface);
  border: 1px solid var(--bm-border-strong);
  border-radius: var(--bm-radius-sm);
  font-family: var(--bm-ui);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--ink);
  box-sizing: border-box;
}

#tab-backmatter textarea { resize: vertical; }
#tab-backmatter .rich-editor { min-height: 96px; font-family: var(--font-serif); font-size: 15px; }

#tab-backmatter textarea:focus,
#tab-backmatter input[type="text"]:focus,
#tab-backmatter .rich-editor:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--bm-ring);
}

#tab-backmatter textarea::placeholder,
#tab-backmatter input::placeholder { color: var(--muted); opacity: 0.65; }

#tab-backmatter .rich-editor:empty::before {
  content: attr(data-placeholder);
  color: var(--muted);
  opacity: 0.65;
  pointer-events: none;
}

#tab-backmatter .bm-field { display: flex; flex-direction: column; gap: 6px; }

#tab-backmatter .bm-field-label {
  display: block;
  font-family: var(--bm-ui);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: normal;
  text-transform: none;
  color: var(--ink);
}

/* Switch-style checkbox */
#tab-backmatter .bm-switch {
  display: inline-flex;
  flex: none;
  flex-direction: row;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font: 500 12.5px var(--bm-ui);
  letter-spacing: normal;
  text-transform: none;
  color: var(--ink-soft);
  cursor: pointer;
}

#tab-backmatter .bm-switch input {
  appearance: none;
  position: relative;
  flex: none;
  width: 34px;
  height: 20px;
  margin: 0;
  background: var(--bm-border-strong);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s;
}

#tab-backmatter .bm-switch input::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s;
}

#tab-backmatter .bm-switch input:checked { background: var(--accent); }
#tab-backmatter .bm-switch input:checked::after { transform: translateX(14px); }
#tab-backmatter .bm-switch input:focus-visible { box-shadow: 0 0 0 3px var(--bm-ring); }

/* ── Templates ── */
#tab-backmatter .bm-template-row { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 10px; }
#tab-backmatter .bm-template-row:empty { display: none; }

#tab-backmatter .bm-template-chip {
  max-width: 100%;
  overflow: hidden;
  padding: 4px 10px;
  font: 500 12px/1.4 var(--bm-ui);
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
  color: var(--ink-soft);
  background: var(--bm-surface-2);
  border: 1px solid var(--bm-border);
  border-radius: 999px;
  cursor: pointer;
}

#tab-backmatter .bm-template-chip::before { content: "+ "; color: var(--accent); font-weight: 700; }
#tab-backmatter .bm-template-chip:hover { color: var(--ink); border-color: var(--accent); background: var(--bm-accent-soft); }

/* ── People: CRediT + bios ── */
#tab-backmatter .bm-person { display: flex; align-items: center; gap: 10px; }

#tab-backmatter .bm-avatar {
  display: grid;
  flex: none;
  place-items: center;
  width: 30px;
  height: 30px;
  font: 650 11.5px var(--bm-ui);
  color: var(--accent);
  background: var(--bm-accent-soft);
  border-radius: 50%;
}

#tab-backmatter .bm-bio-name { margin: 0; font-size: 13.5px; font-weight: 650; color: var(--ink); }

#tab-backmatter .bm-credit-count,
#tab-backmatter .bm-word-count { margin-left: auto; font-size: 11.5px; color: var(--muted); font-variant-numeric: tabular-nums; }

#tab-backmatter .bm-credit { display: flex; flex-direction: column; gap: 10px; }

#tab-backmatter .bm-credit-author {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px 14px;
  background: var(--bm-surface-2);
  border: 1px solid var(--bm-border);
  border-radius: 12px;
}

#tab-backmatter .bm-role-chips { display: flex; flex-wrap: wrap; gap: 6px; }

#tab-backmatter .bm-role-chip {
  padding: 5px 11px;
  font: 500 12px/1.3 var(--bm-ui);
  color: var(--ink-soft);
  background: var(--bm-surface);
  border: 1px solid var(--bm-border-strong);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}

#tab-backmatter .bm-role-chip:hover { border-color: var(--accent); color: var(--ink); }

#tab-backmatter .bm-role-chip.is-on {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

#tab-backmatter .bm-role-chip.is-on::before { content: "✓ "; }

#tab-backmatter .bm-notice {
  padding: 9px 12px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--bm-warn);
  background: var(--bm-warn-bg);
  border: 0;
  border-radius: 8px;
}

#tab-backmatter .bm-authors-statement {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--bm-border);
}

#tab-backmatter .bm-authors-statement > summary {
  font: 600 12.5px var(--bm-ui);
  color: var(--ink-soft);
}

#tab-backmatter .bm-authors-statement > summary:hover,
#tab-backmatter .bm-authors-statement[open] > summary { color: var(--accent); }

#tab-backmatter .bm-authors-statement .card-hint { margin: 8px 0; }

#tab-backmatter .bm-bios { display: flex; flex-direction: column; gap: 12px; transition: opacity 0.15s; }
#tab-backmatter .bm-bios.is-off { opacity: 0.55; }
#tab-backmatter .bm-bio-row { display: flex; flex-direction: column; gap: 8px; margin: 0; }

#tab-backmatter .bm-empty {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

#tab-backmatter .bm-empty-state {
  padding: 22px;
  text-align: center;
  background: var(--bm-surface-2);
  border: 1px dashed var(--bm-border-strong);
  border-radius: 12px;
}

#tab-backmatter .bm-empty-title { margin: 0 0 4px; font-size: 13.5px; font-weight: 650; color: var(--ink); }

/* ── Appendices ── */
#tab-backmatter .bm-appendices { display: flex; flex-direction: column; gap: 14px; }

#tab-backmatter .bm-appendix-card {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: var(--bm-surface);
  border: 1px solid var(--bm-border-strong);
  border-radius: 12px;
}

#tab-backmatter .bm-appendix-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bm-surface-2);
  border-bottom: 1px solid var(--bm-border);
}

#tab-backmatter .bm-appendix-card.is-collapsed .bm-appendix-head { border-bottom: 0; }

#tab-backmatter .bm-appendix-letter {
  display: grid;
  flex: none;
  place-items: center;
  width: 32px;
  height: 32px;
  font: 700 14px var(--bm-ui);
  color: #fff;
  background: var(--accent);
  border-radius: 9px;
}

#tab-backmatter .bm-appendix-head .bm-appendix-title-input {
  flex: 1;
  min-width: 0;
  min-height: 36px;
  padding: 6px 10px;
  font: 600 14.5px var(--bm-ui);
  background: transparent;
  border-color: transparent;
}

#tab-backmatter .bm-appendix-head .bm-appendix-title-input:hover { border-color: var(--bm-border-strong); }
#tab-backmatter .bm-appendix-head .bm-appendix-title-input:focus { background: var(--bm-surface); }

#tab-backmatter .bm-appendix-summary { flex: none; font-size: 11.5px; color: var(--muted); white-space: nowrap; }

#tab-backmatter .bm-appendix-body { display: flex; flex-direction: column; gap: 8px; padding: 14px 16px 16px; }

#tab-backmatter .bm-appendix-tables {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
  padding-top: 14px;
  border-top: 1px solid var(--bm-border);
}

#tab-backmatter .bm-appendix-tables-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
#tab-backmatter .bm-appendix-tables-title { margin: 0; font-size: 12.5px; }

#tab-backmatter .bm-appendix-table-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 12px 14px;
  background: var(--bm-surface);
  border: 1px solid var(--bm-border);
  border-radius: 10px;
}

#tab-backmatter .bm-appendix-table-card.is-missing-caption { box-shadow: inset 3px 0 0 var(--bm-warn); }
#tab-backmatter .bm-appendix-table-card.is-editing {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.12);
}

#tab-backmatter .bm-appendix-table-head { display: flex; align-items: center; gap: 8px; margin: 0; }
#tab-backmatter .bm-appendix-table-head .bm-icon-group { margin-left: auto; gap: 4px; }

#tab-backmatter .bm-table-badge { font-size: 13.5px; font-weight: 650; color: var(--ink); }
#tab-backmatter .bm-appendix-table-card.is-editing .bm-table-badge { color: var(--accent); }

#tab-backmatter .bm-pill {
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  line-height: 1.5;
  border-radius: 999px;
}

#tab-backmatter .bm-pill[hidden] { display: none; }
#tab-backmatter .bm-pill--warn { color: var(--bm-warn); background: var(--bm-warn-bg); }

#tab-backmatter .bm-appendix-table-card .table-edit-mode-bar,
#tab-backmatter .bm-appendix-table-card .table-edit-panel,
#tab-backmatter .bm-appendix-table-card .row-actions--edit {
  margin: 0;
}

#tab-backmatter .bm-appendix-table-card .table-edit-wrap {
  max-height: 360px;
  overflow: auto;
}

#tab-backmatter .bm-appendix-table-preview {
  max-height: 280px;
  margin: 0;
  overflow: auto;
  padding: 10px 12px;
  background: var(--bm-surface-2);
  border: 1px solid var(--bm-border);
  border-radius: 8px;
}

#tab-backmatter .bm-appendix-table-preview table { font-size: 12.5px; }

#tab-backmatter .bm-table-fields {
  display: grid;
  grid-template-columns: minmax(130px, 190px) minmax(0, 1fr);
  gap: 12px;
}

#tab-backmatter .bm-appendix-table-card .bm-switch { margin: 0; }

#tab-backmatter .bm-appendix-table-html {
  min-height: 140px;
  font-family: var(--font-mono);
  font-size: 12px;
}

/* Appendix import dropzone */
#tab-backmatter .bm-appendix-table-import { margin: 0; padding: 0; border: 0; }

#tab-backmatter .dropzone {
  margin: 0;
  padding: 16px 18px;
  background: var(--bm-surface-2);
  border: 1.5px dashed var(--bm-border-strong);
  border-radius: var(--bm-radius-sm);
  transition: border-color 0.15s, background 0.15s;
}

#tab-backmatter .dropzone:hover,
#tab-backmatter .dropzone.drag,
#tab-backmatter .dropzone:focus-visible {
  outline: none;
  border-color: var(--accent);
  background: var(--bm-accent-soft);
}

#tab-backmatter .bm-appendix-table-import-dropzone .dz-inner {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 2px 12px;
  text-align: left;
}

#tab-backmatter .bm-appendix-table-import-dropzone .dz-icon {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin: 0;
  font-size: 17px;
  color: var(--accent);
  background: var(--bm-surface);
  border: 1px solid var(--bm-border);
  border-radius: 10px;
}

#tab-backmatter .dz-text { font-size: 13px; font-weight: 600; color: var(--ink); }
#tab-backmatter .dz-link { text-decoration: none; border-bottom: 1px solid currentColor; }
#tab-backmatter .dz-meta { margin: 0; font-family: var(--bm-ui); font-size: 12px; letter-spacing: normal; color: var(--muted); }

#tab-backmatter .table-import-meta:empty { display: none; }

#tab-backmatter .table-import-meta {
  margin-top: 8px;
  padding: 8px 12px;
  font-size: 12.5px;
  color: var(--ink-soft);
  background: var(--bm-surface-2);
  border-radius: 8px;
}

#tab-backmatter .table-import-meta[data-tone="good"] { color: var(--bm-good); background: var(--bm-good-bg); }
#tab-backmatter .table-import-meta[data-tone="warn"] { color: var(--bm-warn); background: var(--bm-warn-bg); }
#tab-backmatter .table-import-meta[data-tone="bad"] { color: var(--bm-bad); background: var(--bm-bad-bg); }

/* ── Supplementary ── */
#tab-backmatter .bm-supp-list { display: flex; flex-direction: column; gap: 8px; }
#tab-backmatter .bm-supp-list:not(:empty) { margin-bottom: 12px; }

#tab-backmatter .supp-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  padding: 10px 12px;
  background: var(--bm-surface);
  border: 1px solid var(--bm-border);
  border-radius: 10px;
}

#tab-backmatter .bm-file-ext {
  display: grid;
  flex: none;
  place-items: center;
  width: 42px;
  height: 42px;
  font: 700 10.5px var(--bm-ui);
  letter-spacing: 0.04em;
  color: var(--accent);
  background: var(--bm-accent-soft);
  border-radius: 9px;
}

#tab-backmatter .bm-file-main { display: flex; flex: 1; flex-direction: column; gap: 6px; min-width: 0; }
#tab-backmatter .bm-file-name { display: flex; align-items: baseline; gap: 10px; min-width: 0; }

#tab-backmatter .supp-name {
  overflow: hidden;
  font-size: 13.5px;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--ink);
}

#tab-backmatter .bm-file-size { flex: none; font-size: 11.5px; color: var(--muted); }
#tab-backmatter .bm-file-desc { min-height: 34px; padding: 6px 10px; font-size: 13px; }

#tab-backmatter .bm-supp-dropzone { text-align: center; }

/* ── Responsive ── */
@media (max-width: 760px) {
  #tab-backmatter .bm-card-head { flex-direction: column; }
  #tab-backmatter .bm-table-fields { grid-template-columns: 1fr; }
  #tab-backmatter .bm-appendix-summary { display: none; }
  #tab-backmatter .bm-page-title { font-size: 22px; }
}

@media (max-width: 900px) {
  #tab-backmatter > .panel-grid { grid-template-columns: minmax(0, 1fr); }
}