:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --text: #1d2430;
  --muted: #5d6676;
  --border: #d9dee6;
  --accent: #2f5d8a;
  --accent-strong: #244a6f;
  --accent-soft: #e6eef6;
  --on-accent: #ffffff;
  --danger: #b3362f;
  --danger-soft: #fbeceb;
  --warn-bg: #fff4e0;
  --warn-text: #7a4b00;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181f;
    --surface: #1c222b;
    --text: #e6e9ee;
    --muted: #9aa3b2;
    --border: #2f3743;
    --accent: #7fb0e0;
    --accent-strong: #a3c7ea;
    --accent-soft: #233446;
    --on-accent: #0f1620;
    --danger: #f08a83;
    --danger-soft: #3a2220;
    --warn-bg: #3a2d14;
    --warn-text: #f3c77a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

[hidden] { display: none !important; }

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  margin-bottom: 24px;
}
.site-header h1 { margin: 0; font-size: 1.6rem; }
.tagline { margin: 2px 0 0; color: var(--muted); }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
}
.panel h2 { margin: 0 0 12px; font-size: 1.25rem; }
.panel h3 { margin: 24px 0 8px; font-size: 1rem; }
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.panel-head h2 { margin: 0; }
.subhead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 24px 0 8px;
}
.subhead h3 { margin: 0; }

.hint { margin: 0 0 16px; color: var(--muted); }
.hint.small { font-size: 0.85rem; margin: 8px 0 0; }
.meta { margin: 8px 0 0; color: var(--muted); font-size: 0.92rem; }
.privacy-note {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}

/* Buttons & form controls */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s;
}
.button.small { padding: 5px 12px; font-size: 0.9rem; }
.button.large { padding: 12px 24px; font-size: 1.05rem; }
.button.primary { background: var(--accent); color: var(--on-accent); }
.button.primary:hover:not(:disabled) { background: var(--accent-strong); }
.button.secondary { background: var(--surface); color: var(--accent); border-color: var(--border); }
.button.secondary:hover:not(:disabled) { border-color: var(--accent); background: var(--accent-soft); }
.button.danger { background: var(--surface); color: var(--danger); border-color: var(--border); }
.button.danger:hover { border-color: var(--danger); background: var(--danger-soft); }
.button:disabled { opacity: 0.5; cursor: not-allowed; }

.link-button {
  border: none;
  background: none;
  padding: 0;
  color: var(--accent);
  cursor: pointer;
  font: inherit;
  font-size: 0.9rem;
  text-decoration: underline;
}

input[type="text"],
input[type="number"],
select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}
input:focus-visible,
select:focus-visible,
button:focus-visible,
.drop-zone:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
input:disabled { opacity: 0.5; }
select { font-weight: 600; font-size: 1.05rem; }

.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; }
.field > span { font-size: 0.85rem; font-weight: 600; color: var(--muted); }
.field-row { display: flex; gap: 12px; flex-wrap: wrap; }
.field.grow { flex: 1 1 240px; }
.field.narrow { flex: 0 0 110px; }

.check { display: flex; align-items: center; gap: 8px; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }

.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }


/* Banners & messages */
.banner { padding: 10px 14px; border-radius: 8px; margin: 12px 0 0; }
.banner.error { background: var(--danger-soft); color: var(--danger); }
.banner.warn { background: var(--warn-bg); color: var(--warn-text); }
#fatal { margin: 0 0 24px; }

.status { min-height: 1.25em; margin: 8px 0 0; color: var(--muted); font-size: 0.92rem; }
.status:empty { min-height: 0; margin: 0; }
.status.error { color: var(--danger); }

.messages { list-style: none; margin: 20px 0 0; padding: 0; display: grid; gap: 8px; }
.messages:empty { display: none; }
.messages li { padding: 8px 12px; border-radius: 8px; font-size: 0.92rem; }
.messages .error { background: var(--danger-soft); color: var(--danger); }
.messages .warn { background: var(--warn-bg); color: var(--warn-text); }

#generate { margin-top: 20px; }

/* Dataset panel */
.type-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.type-chip {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 2px 8px 2px 2px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}
.type-chip .code { margin-right: 4px; border-radius: 999px; }

.file-details { margin-top: 10px; font-size: 0.9rem; }
.file-details summary { cursor: pointer; color: var(--muted); }
.plain-list { margin: 6px 0 0; padding-left: 20px; color: var(--muted); }

.editor h3 { margin-top: 0; }

/* Drop zone */
.drop-zone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 28px 16px;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
}
.drop-zone:hover,
.drop-zone.dragging {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.drop-zone input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.drop-icon { color: var(--accent); }
.drop-title { font-weight: 600; font-size: 1.05rem; }
.drop-sub { color: var(--muted); font-size: 0.9rem; }

.file-list { list-style: none; margin: 8px 0 0; padding: 0; }
.file-list:empty { display: none; }
.file-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  border-top: 1px solid var(--border);
}
.file-name { flex: 1; min-width: 0; overflow-wrap: anywhere; font-weight: 500; }
.file-count { color: var(--muted); white-space: nowrap; font-size: 0.9rem; }
.file-count.warn { color: var(--warn-text); background: var(--warn-bg); padding: 2px 8px; border-radius: 999px; }
.remove-button {
  border: none;
  background: none;
  color: var(--muted);
  font-size: 1.25rem;
  line-height: 1;
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
}
.remove-button:hover { color: var(--danger); background: var(--danger-soft); }

/* Chapter picker: one card per book with a text field and a checklist */
.chapter-hint { margin: 0 0 10px; }
.chapter-picker { display: grid; gap: 10px; }
.book-card { border: 1px solid var(--border); border-radius: 10px; }
.book-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 12px;
  padding: 10px 10px 10px 14px;
}
.book-check { display: flex; align-items: center; gap: 8px; font-weight: 700; cursor: pointer; }
.book-card input[type="checkbox"] { width: 18px; height: 18px; margin: 0; accent-color: var(--accent); flex: none; }
.book-text { flex: 1 1 140px; max-width: 240px; padding: 6px 10px; }
.book-text[aria-invalid="true"] { border-color: var(--danger); }
.book-count { color: var(--muted); font-size: 0.88rem; white-space: nowrap; font-variant-numeric: tabular-nums; }
.collapse-button {
  margin-left: auto;
  display: inline-flex;
  padding: 6px;
  border: none;
  border-radius: 6px;
  background: none;
  color: var(--muted);
  cursor: pointer;
}
.collapse-button:hover { background: var(--accent-soft); color: var(--text); }
.collapse-button svg { transition: transform 0.15s; }
.book-card.collapsed .collapse-button svg { transform: rotate(-90deg); }
.book-card.collapsed .chapter-list { display: none; }
.book-error { margin: -4px 14px 8px; color: var(--danger); font-size: 0.88rem; }
.book-error:empty { display: none; }
.chapter-list {
  columns: 4 118px;
  column-gap: 16px;
  padding: 6px 10px 10px;
  border-top: 1px solid var(--border);
}
.chapter-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 6px;
  border-radius: 6px;
  break-inside: avoid;
  cursor: pointer;
  user-select: none;
}
.chapter-row:hover { background: var(--accent-soft); }
.chapter-name { font-weight: 600; white-space: nowrap; }
.chapter-count { margin-left: auto; color: var(--muted); font-size: 0.82rem; font-variant-numeric: tabular-nums; }
.chapter-row.off .chapter-name { color: var(--muted); font-weight: 400; }

/* Tables */
.table-scroll { overflow-x: auto; }
.type-table { width: 100%; border-collapse: collapse; }
.type-table th,
.type-table td {
  padding: 8px;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
.type-table th { font-size: 0.8rem; color: var(--muted); font-weight: 600; white-space: nowrap; }
.type-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.type-table tr.zero td { color: var(--muted); opacity: 0.6; }
.type-table tfoot td { font-weight: 700; border-bottom: none; }
.type-table input[type="number"] { width: 4.5em; text-align: right; padding: 5px 6px; }
.type-table .total.short { color: var(--warn-text); background: var(--warn-bg); }
.type-table.no-tb .tb-col { display: none; }

.code {
  display: inline-block;
  min-width: 1.8em;
  margin-right: 8px;
  padding: 1px 6px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  text-align: center;
  font-size: 0.85rem;
}

/* Tiebreakers */
.tb-options { display: flex; gap: 16px; flex-wrap: wrap; align-items: flex-end; margin-top: 12px; }
.tb-options.disabled { opacity: 0.5; }
.tb-options .field { margin-bottom: 0; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
output { color: var(--text); }

/* Result preview */
.preview { margin-top: 16px; display: grid; gap: 8px; }
.preview details { border: 1px solid var(--border); border-radius: 8px; }
.preview summary { padding: 10px 14px; cursor: pointer; font-weight: 600; }
.q-list { list-style: none; margin: 0; padding: 0 14px 8px; }
.q-list li {
  display: grid;
  grid-template-columns: 2.2em auto 1fr;
  align-items: start;
  padding: 8px 0;
  border-top: 1px solid var(--border);
}
.q-num { color: var(--muted); font-variant-numeric: tabular-nums; padding-top: 1px; }
.q-text { margin: 0; }
.q-answer { margin: 2px 0 0; color: var(--muted); font-size: 0.92rem; }
.q-ref { white-space: nowrap; }

@media (max-width: 560px) {
  .panel { padding: 16px; }
  .type-name { display: block; font-size: 0.8rem; color: var(--muted); }
  .type-table td:first-child .code { margin-bottom: 2px; }
  .type-table th, .type-table td { padding: 6px 4px; }
  .type-table input[type="number"] { width: 3.6em; }
}

/* Pick styles */
.style-options { display: grid; gap: 10px; }
.style-card {
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  transition: border-color 0.15s, background-color 0.15s;
}
.style-card:hover { border-color: var(--accent); }
.style-card.selected { border-color: var(--accent); background: var(--accent-soft); }
.style-choice { display: flex; align-items: flex-start; gap: 10px; cursor: pointer; }
.style-choice input { width: 18px; height: 18px; margin: 2px 0 0; accent-color: var(--accent); flex: none; }
.style-choice strong { display: block; }
.style-summary { display: block; color: var(--muted); font-size: 0.9rem; margin-top: 2px; }
.style-how { margin: 8px 0 0 28px; font-size: 0.9rem; }
.style-how summary { cursor: pointer; color: var(--accent); font-weight: 600; }
.style-how ul, .rules-details ul { margin: 6px 0 0; padding-left: 18px; display: grid; gap: 4px; }
.rules-details { margin-top: 10px; font-size: 0.9rem; }
.rules-details summary { cursor: pointer; color: var(--muted); }
.rules-details li { color: var(--muted); }