html,
body {
  margin: 0;
  height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background: #f3f4f6;
}

h1 {
  text-align: center;
  /* margin: 12px 0 0 0; */
  /* font-size: 20px; */
  /* letter-spacing: 0.03em; */
}

#app {
  display: grid;
  grid-template-columns: 320px 1fr;
  height: calc(100dvh - 32px);
}

/* ------- left sidebar ------- */

aside#controls {
  padding: 16px 14px;
  border-right: 1px solid #e5e7eb;
  background: #f9fafb;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

aside#controls h2 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #6b7280;
  margin: 0 0 4px 0;
}

.axis-panels {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.axis-panel {
  background: #ffffff;
  border-radius: 10px;
  padding: 10px 12px 12px;
  box-shadow: 0 0 0 1px #e5e7eb;
}

.axis-panel h3 {
  margin: 0 0 8px 0;
  font-size: 15px;
  font-weight: 600;
  color: #111827;
  border-bottom: 1px solid #f3f4f6;
  padding-bottom: 4px;
}

.group-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}

.group-row label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 999px;
  background: #f3f4f6;
  font-size: 11px;
  color: #374151;
  cursor: pointer;
}

.group-row input[type="checkbox"] {
  margin: 0;
}

.overflow {
  overflow: auto;
  border-radius: 6px;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  padding: 4px 6px;
  font-size: 11px;
  max-height: 140px;
}

#list-x label,
#list-y label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 0;
  color: #374151;
}

#list-x input,
#list-y input {
  margin: 0;
}

.row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 6px;
  font-size: 11px;
}

.row.small {
  justify-content: flex-end;
}

/* buttons */

button {
  font-family: inherit;
  font-size: 11px;
  cursor: pointer;
}

.btn {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid #d1d5db;
  background: #ffffff;
  color: #374151;
  font-weight: 500;
}

.btn:hover {
  background: #f3f4f6;
}

.btn-primary {
  background: #f59e0b;
  border-color: #f59e0b;
  color: #111827;
}

.btn-primary:hover {
  background: #fbbf24;
}

.btn-ghost {
  border-color: transparent;
  background: transparent;
}

#toolbar {
  background: #ffffff;
  box-shadow: 0 0 0 1px #e5e7eb;
  border-radius: 10px;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
}

#selected-count {
  color: #6b7280;
}

/* ------- main area ------- */

#main {
  padding: 12px 18px 18px;
  overflow: auto;
  background: #ffffff;
}

#plot-info {
  color: #6b7280;
  margin-bottom: 8px;
  font-size: 13px;
}

#knn-delta {
  width: 100px;
  align-self: flex-end;
}