:root {
  --brand-900: #0f2540;
  --brand-700: #1d3f66;
  --brand-500: #2f6fb0;
  --brand-100: #e7f0fa;
  --ink: #1c2530;
  --muted: #5b6b7c;
  --border: #d8dee5;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --danger-bg: #fdeceb;
  --danger-ink: #9c2b23;
  --danger-border: #f3c3bf;
  --pos: #1a7a4c;
  --neg: #b5352a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Noto Sans TC", "Microsoft JhengHei", "PingFang TC", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--brand-900);
  color: #fff;
  flex-wrap: wrap;
  gap: 10px;
}
.topbar-title { font-size: 1.15rem; font-weight: 700; letter-spacing: 0.02em; }
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.subtext { font-size: 0.8rem; color: #b9c8d8; }

.btn {
  padding: 7px 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.88rem;
  transition: background-color 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { background: var(--brand-100); }
.btn-primary { background: var(--brand-500); color: #fff; border-color: var(--brand-500); }
.btn-primary:hover { background: var(--brand-700); }
.btn-remove-cmp {
  background: transparent;
  border: 1px solid var(--danger-border);
  color: var(--danger-ink);
  padding: 4px 10px;
  font-size: 0.8rem;
}
.btn-remove-cmp:hover { background: var(--danger-bg); }

.errorbanner {
  background: var(--danger-bg);
  color: var(--danger-ink);
  padding: 12px 20px;
  border-bottom: 1px solid var(--danger-border);
  font-size: 0.9rem;
}

.layout {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 20px;
  max-width: 1400px;
  margin: 0 auto;
}

.sidebar {
  flex: 0 0 300px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  box-shadow: 0 1px 2px rgba(15, 37, 64, 0.05);
  position: sticky;
  top: 20px;
}

.results { flex: 1 1 auto; min-width: 0; }

.field { margin-bottom: 18px; }
.field:last-child { margin-bottom: 0; }
.field label {
  display: block;
  font-weight: 700;
  margin-bottom: 6px;
  font-size: 0.85rem;
  color: var(--brand-900);
}
.field select {
  width: 100%;
  padding: 6px 8px;
  margin-bottom: 4px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface);
  font-size: 0.88rem;
  color: var(--ink);
}

.rowpair { display: flex; gap: 6px; }
.rowpair select { flex: 1 1 0; }
.comparison-row { align-items: center; margin-bottom: 8px; }
.comparison-row .btn-remove-cmp { flex: 0 0 auto; }
#btn-add-comparison { margin-top: 6px; width: 100%; }

.radiogroup { display: flex; flex-direction: column; gap: 5px; }
.radioitem { display: flex; align-items: center; gap: 6px; font-size: 0.88rem; }

.checkboxlist {
  max-height: 280px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  background: #fbfcfd;
}
.checkitem { display: flex; align-items: center; gap: 7px; font-size: 0.88rem; padding: 3px 2px; }
.checkitem:hover { background: var(--brand-100); border-radius: 4px; }

.empty-hint {
  color: var(--muted);
  padding: 40px 24px;
  text-align: center;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: 10px;
  font-size: 0.95rem;
}

.resultblock {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 18px;
  box-shadow: 0 1px 2px rgba(15, 37, 64, 0.05);
}
.resultblock-title {
  font-weight: 700;
  margin-bottom: 10px;
  font-size: 1rem;
  color: var(--brand-900);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--brand-100);
}

.tablescroll { overflow-x: auto; }
table.resulttable {
  border-collapse: collapse;
  width: 100%;
  min-width: 680px;
  font-variant-numeric: tabular-nums;
}
table.resulttable th, table.resulttable td {
  border: 1px solid var(--border);
  padding: 7px 10px;
  font-size: 0.85rem;
  text-align: right;
  white-space: nowrap;
}
table.resulttable th.rowlabel, table.resulttable td.rowlabel {
  text-align: left;
  color: var(--muted);
  font-weight: 600;
  background: #fbfcfd;
}
table.resulttable thead th {
  background: var(--brand-100);
  color: var(--brand-900);
  text-align: center;
  font-weight: 700;
}
table.resulttable tbody tr:nth-child(4n+3),
table.resulttable tbody tr:nth-child(4n) {
  background: #fafbfc;
}

@media (max-width: 900px) {
  .layout { flex-direction: column; padding: 12px; }
  .sidebar { flex: 1 1 auto; width: 100%; position: static; }
}