:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5d6570;
  --border: #dcd9d0;
  --accent: #1f6f5c;
  --accent-text: #ffffff;
  --accent-soft: #e3f0ec;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --success: #1a7f37;
  --warn: #8a5a00;
  --warn-soft: #fff4d6;
  --radius: 10px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --surface: #1e2125;
    --text: #e8e6e1;
    --muted: #a3a9b1;
    --border: #33373d;
    --accent: #5cc2a6;
    --accent-text: #0f1a17;
    --accent-soft: #1f3a33;
    --danger: #f97066;
    --danger-soft: #3a1f1d;
    --success: #4ac26b;
    --warn: #f5c451;
    --warn-soft: #3a3020;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent); }
[hidden] { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
}
.header-inner {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
.site-header h1 { margin: 0; font-size: 1.75rem; }
.tagline { margin: 4px 0 0; color: var(--muted); }

/* Buttons */
.btn {
  font: inherit;
  border-radius: 8px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: 0.6; cursor: wait; }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}
.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-ghost { background: transparent; }
.btn-small { padding: 4px 10px; font-size: 0.85rem; }

/* Form controls */
select, input, textarea {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  width: 100%;
}
input[type="checkbox"] { width: auto; }
.search { padding: 12px 14px; border-radius: var(--radius); }

/* Filters */
.filters { padding: 24px 0 8px; }
.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
  align-items: flex-end;
}
.filter-row label {
  display: flex;
  flex-direction: column;
  font-size: 0.85rem;
  color: var(--muted);
  gap: 4px;
  flex: 1 1 220px;
}
.filter-row .search { flex: 1 1 300px; width: auto; }
.result-count { color: var(--muted); font-size: 0.9rem; margin: 12px 0 0; }

/* Results */
.results-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.results-bar .result-count { margin: 0; }
.collapse-controls { display: flex; gap: 6px; }

.type-group { margin: 24px 0; }
.type-group > summary {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  padding: 6px 0;
  border-bottom: 2px solid var(--accent);
  user-select: none;
}
.type-group > summary::-webkit-details-marker { display: none; }
.type-group > summary::before {
  content: "";
  width: 0.55em;
  height: 0.55em;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
  transition: transform 0.15s ease;
  flex: none;
}
.type-group[open] > summary::before { transform: rotate(45deg); }
.type-group > summary:hover h2 { color: var(--accent); }
.type-group > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
.type-group > summary h2 { font-size: 1.4rem; margin: 0; }
.type-count {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}
.type-group[open] > summary { margin-bottom: 4px; }
@media (prefers-reduced-motion: reduce) { .type-group > summary::before { transition: none; } }
.section-heading {
  font-size: 1.05rem;
  margin: 20px 0 10px;
  color: var(--muted);
}
.entry {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}
.entry h4 { margin: 0; font-size: 1.1rem; }
.description { margin: 6px 0 0; }
.citation {
  margin: 10px 0;
  padding-left: 2em;
  text-indent: -2em; /* APA hanging indent */
  overflow-wrap: anywhere;
  color: var(--muted);
}
.citation-preview {
  margin: -4px 0 0;
  padding: 8px 10px 8px calc(2em + 10px);
  border: 1px dashed var(--border);
  border-radius: 8px;
  font-size: 0.9rem;
}
.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.chip {
  font: inherit;
  font-size: 0.8rem;
  padding: 2px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--accent-soft);
  color: var(--text);
  cursor: pointer;
}
.chip:hover { border-color: var(--accent); }
.badge-approx {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--warn-soft);
  color: var(--warn);
}
.entry-actions { margin-left: auto; display: flex; gap: 6px; }
.empty { text-align: center; color: var(--muted); padding: 48px 0; }

/* Dialogs */
dialog {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0;
  width: min(600px, calc(100vw - 32px));
  max-height: calc(100vh - 32px);
  background: var(--surface);
  color: var(--text);
}
dialog::backdrop { background: rgba(0, 0, 0, 0.45); }
.modal-form, .editor {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.modal-form { padding: 20px; }
.modal-form h2 { margin: 0; }
.modal-form label, .editor label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.9rem;
}
label.check { flex-direction: row; align-items: center; gap: 8px; }
.reason-fields { display: flex; flex-direction: column; gap: 12px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 520px) { .two-col { grid-template-columns: 1fr; } }
.hint { margin: 0; color: var(--muted); font-size: 0.9rem; }
.req { color: var(--danger); }
.hp { position: absolute; left: -10000px; }
.form-status { margin: 0; min-height: 1.2em; font-size: 0.9rem; }
.form-status.error { color: var(--danger); }
.form-status.success { color: var(--success); }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; flex-wrap: wrap; }

/* Admin */
.tabs {
  display: flex;
  gap: 4px;
  margin: 24px 0 12px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.tabs button {
  font: inherit;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  padding: 8px 12px;
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
}
.tabs button[aria-selected="true"] { color: var(--text); border-bottom-color: var(--accent); font-weight: 600; }
.admin-card { display: flex; flex-direction: column; gap: 10px; }
.admin-card > .btn { align-self: flex-start; }
.admin-card-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.admin-card-head h3 { margin: 0; font-size: 1.1rem; flex: 1 1 auto; }
.kind-badge {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
}
.kind-suggest { background: var(--accent-soft); color: var(--accent); }
.kind-report { background: var(--danger-soft); color: var(--danger); }
.info-row { margin: 0; overflow-wrap: anywhere; }
.diff { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.diff th, .diff td { text-align: left; padding: 6px 8px; border: 1px solid var(--border); vertical-align: top; overflow-wrap: anywhere; }
.diff-old { background: var(--danger-soft); }
.diff-new { background: var(--accent-soft); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 48px;
  padding: 24px 0;
  color: var(--muted);
  font-size: 0.85rem;
}
.site-footer p { margin: 4px 0; }

.not-found { padding: 64px 16px; text-align: center; }