:root {
  color-scheme: light dark;
  --accent: #00897b;

  --bg:          #fafafa;
  --bg-card:     #ffffff;
  --bg-hover:    #eeeeee;
  --bg-hop:      #fafafa;
  --bg-error:    #fdd;
  --text:        #111111;
  --text-muted:  #555555;
  --text-faint:  #777777;
  --text-meta:   #888888;
  --text-value:  #222222;
  --text-error:  #900;
  --text-warn:   #a3221f;
  --border:      #dddddd;
  --border-soft: #eeeeee;
  --border-input:#cccccc;
  --border-error:#cc3333;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #121212;
    --bg-card:     #1e1e1e;
    --bg-hover:    #2a2a2a;
    --bg-hop:      #1a1a1a;
    --bg-error:    #3b1111;
    --text:        #e8e8e8;
    --text-muted:  #aaaaaa;
    --text-faint:  #888888;
    --text-meta:   #777777;
    --text-value:  #dddddd;
    --text-error:  #ff8080;
    --text-warn:   #f08080;
    --border:      #333333;
    --border-soft: #2a2a2a;
    --border-input:#444444;
    --border-error:#cc3333;
  }
}

* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  background: var(--accent);
  color: #fff;
  font-size: 1.25rem;
  font-weight: 600;
  padding: 1rem 1.5rem;
}

.container {
  max-width: 700px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.row {
  display: flex;
  gap: 0.5rem;
}

#domain {
  flex: 1;
  padding: 0.6rem 0.75rem;
  font-size: 1rem;
  border: 1px solid var(--border-input);
  border-radius: 4px;
  background: var(--bg-card);
  color: var(--text);
}

#domain:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  font-size: 1rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.type-tabs {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
  margin-top: 1rem;
}

.type-tab {
  flex: 1 1 auto;
  min-width: 3.5rem;
  padding: 0.5rem 0.4rem;
  margin: 2px;
  font-size: 0.8rem;
  color: var(--text);
  background: none;
  border: none;
  border-radius: 999px;
  cursor: pointer;
}

.type-tab:hover {
  background: var(--bg-hover);
}

.type-tab.active {
  background: var(--accent);
  color: #fff;
}

details {
  margin-top: 0.75rem;
  border: 1px solid var(--border-input);
  border-radius: 4px;
  padding: 0.5rem 0.75rem;
}

summary {
  cursor: pointer;
}

.type-tabs-more {
  margin-top: 0.5rem;
}

.check-tabs {
  margin-top: 0.25rem;
}

.check-tab {
  border: 1px dashed var(--accent);
  color: var(--accent);
}

.check-tab:hover {
  background: rgba(0, 137, 123, 0.12);
}

.check-tab.active {
  background: var(--accent);
  color: #fff;
  border-style: solid;
}

.advanced-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.75rem;
  align-items: center;
}

.advanced-row label {
  display: flex;
  flex-direction: column;
  font-size: 0.85rem;
  gap: 0.25rem;
}

.advanced-row label.checkbox {
  flex-direction: row;
  align-items: center;
}

.es-section {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-soft);
}

.es-section:last-child {
  border-bottom: none;
}

.es-heading {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.error {
  margin-top: 1rem;
  padding: 0.5rem 0.75rem;
  background: var(--bg-error);
  border: 1px solid var(--border-error);
  border-radius: 4px;
  color: var(--text-error);
}

.results {
  margin-top: 1.5rem;
}

.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.25rem;
}

.mono {
  font-family: ui-monospace, Menlo, Consolas, monospace;
}

.empty-note {
  color: var(--text-faint);
  font-style: italic;
  margin: 0;
}

.answer-block {
  position: relative;
  padding: 0.75rem 3.75rem 0.75rem 0;
  border-bottom: 1px solid var(--border-soft);
}

.answer-block:last-child {
  border-bottom: none;
}

.card-header {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 0.5rem;
}

.copy-btn {
  background: none;
  border: 1px solid var(--border-input);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1.4;
  white-space: nowrap;
  flex: none;
}

.copy-btn:hover {
  background: var(--bg-hover);
  border-color: var(--text-faint);
}

.copy-btn.copied {
  color: var(--accent);
  border-color: var(--accent);
}

.answer-block > .copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0;
}

.field-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 0.5rem;
  padding: 0.15rem 0;
  font-size: 0.9rem;
}

.field-label {
  font-weight: 600;
  color: var(--text-muted);
}

.field-value {
  color: var(--text-value);
  word-break: break-all;
}

.result-footer {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-meta);
}

.result-footer.warn {
  color: var(--text-warn);
}

.short-list, .referral-list {
  margin: 0;
  padding-left: 1.2rem;
}

.short-list li, .referral-list li {
  padding: 0.15rem 0;
}

.short-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.hop-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.hop-card {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 0.75rem;
  background: var(--bg-hop);
  border-radius: 0 4px 4px 0;
}

.hop-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hop-step {
  font-weight: 600;
  color: var(--text);
}

.hop-detail {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin: 0.25rem 0 0;
}