:root {
  --text: #1a1a1a;
  --muted: #666;
  --border: #ddd;
  --accent: #0f62fe;
  --bg: #ffffff;
  --bg-soft: #f7f7f8;
  --leaf-bg: #e6f4ea;
  --leaf-text: #1e7a34;
  --sub-bg: #fff4e5;
  --sub-text: #9a6400;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

body {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 16px 48px;
}

.site-header {
  padding: 24px 0 16px;
  border-bottom: 1px solid var(--border);
}

.site-header h1 {
  font-size: 1.5rem;
  margin: 0 0 8px;
}

.subcopy {
  margin: 0 0 4px;
  color: var(--text);
  font-size: 0.95rem;
}

.subcopy-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.search-panel {
  padding: 20px 0 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 10px;
}

.field-label:first-child { margin-top: 0; }

#keyword, #level1 {
  width: 100%;
  padding: 12px 14px;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-soft);
  color: var(--text);
  min-height: 48px;
}

#keyword:focus, #level1:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  background: var(--bg);
}

.status-panel {
  min-height: 1.4em;
  padding: 10px 0 4px;
  font-size: 0.9rem;
  color: var(--muted);
}

.status-panel.empty-hint {
  color: var(--muted);
}

.status-panel.zero-hint,
.status-panel.overflow-hint {
  color: #b3261e;
  font-weight: 600;
}

.results-panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 16px;
}

.result-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  background: var(--bg-soft);
}

.result-path {
  font-size: 0.98rem;
  word-break: break-word;
  line-height: 1.5;
}

.result-meta {
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge {
  display: inline-block;
  font-size: 0.78rem;
  padding: 3px 9px;
  border-radius: 999px;
  font-weight: 600;
}

.badge.leaf {
  background: var(--leaf-bg);
  color: var(--leaf-text);
}

.badge.subcategory {
  background: var(--sub-bg);
  color: var(--sub-text);
}

.badge-level1 {
  font-size: 0.78rem;
  color: var(--muted);
}

.site-footer {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--muted);
}

.meta-line {
  margin: 0 0 10px;
}

.disclaimer {
  margin: 0 0 12px;
  line-height: 1.7;
}

.footer-links a {
  color: var(--accent);
}

@media (max-width: 400px) {
  body { padding: 0 12px 40px; }
  .site-header h1 { font-size: 1.3rem; }
}

/* --- SEO / AI discoverability minimal layer (static content sections) --- */

.info-panel,
.level1-panel,
.faq-panel {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.info-panel h2,
.level1-panel h2,
.faq-panel h2 {
  font-size: 1.05rem;
  margin: 0 0 10px;
}

.info-panel h2 + h2 {
  margin-top: 20px;
}

.info-panel ul {
  margin: 0 0 4px;
  padding-left: 20px;
}

.info-panel li {
  margin-bottom: 4px;
  font-size: 0.9rem;
  color: var(--text);
}

.info-panel p {
  font-size: 0.9rem;
  margin: 0 0 4px;
  color: var(--text);
}

.level1-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
  columns: 2;
  column-gap: 16px;
}

.level1-list li {
  font-size: 0.85rem;
  padding: 3px 0;
  break-inside: avoid;
  color: var(--text);
}

@media (max-width: 400px) {
  .level1-list { columns: 1; }
}

.faq-panel dt {
  font-weight: 600;
  font-size: 0.92rem;
  margin-top: 14px;
}

.faq-panel dt:first-child {
  margin-top: 0;
}

.faq-panel dd {
  margin: 4px 0 0;
  font-size: 0.88rem;
  color: var(--text);
}