:root {
  --bg: #f4f6f8;
  --card-bg: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e2e8f0;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --danger: #dc2626;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  background: var(--accent-dark);
  color: #fff;
  padding: 12px 16px;
  position: sticky;
  top: 0;
  z-index: 10;
}
header h1 { margin: 0 0 8px 0; font-size: 1.2rem; }

#tabnav { display: flex; gap: 6px; flex-wrap: wrap; }
.tab-btn {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: none;
  padding: 8px 14px;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  font-size: 0.95rem;
}
.tab-btn.active { background: var(--card-bg); color: var(--accent-dark); font-weight: 600; }

main { padding: 12px; max-width: 1100px; margin: 0 auto; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.panel-grid {
  display: grid;
  grid-template-columns: minmax(260px, 340px) 1fr;
  gap: 12px;
}
@media (max-width: 720px) {
  .panel-grid { grid-template-columns: 1fr; }
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 12px;
}
.card h2 { margin-top: 0; font-size: 1rem; color: var(--muted); }

form label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.9rem;
  color: var(--muted);
}
form input, form select {
  display: block;
  width: 100%;
  padding: 7px 8px;
  margin-top: 4px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
}
form select[multiple] { height: auto; }

button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 9px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
}
button:hover { background: var(--accent-dark); }

.fav-actions { display: flex; gap: 8px; margin-bottom: 12px; }
.fav-actions button { flex: 1; background: #64748b; font-size: 0.85rem; padding: 6px; }
.fav-actions button:hover { background: #475569; }

.result-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.result-table td { padding: 5px 4px; border-bottom: 1px solid var(--border); }
.result-table td:first-child { color: var(--muted); white-space: nowrap; }
.result-table td:last-child { text-align: right; font-variant-numeric: tabular-nums; }

.chart-card { overflow-x: auto; }
.chart-card canvas { max-width: 100%; }

.compare-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; margin-bottom: 14px; }
.compare-table th, .compare-table td {
  border: 1px solid var(--border);
  padding: 5px 6px;
  text-align: right;
  white-space: nowrap;
}
.compare-table th:first-child, .compare-table td:first-child { text-align: left; }
.compare-table th { background: #f1f5f9; }

.error-msg { color: var(--danger); font-size: 0.9rem; margin-top: 8px; }

.hint { color: var(--muted); font-size: 0.85rem; margin-top: -6px; }

.inline-form { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; margin-bottom: 10px; }
.inline-form label { margin-bottom: 0; min-width: 160px; }
.inline-form button { height: 38px; }