* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f8f9fb;
  color: #151515;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

h1 {
  margin-bottom: 0.4rem;
}

.subtitle {
  margin-top: 0;
  color: #4b5563;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.9rem;
}

.tab-button {
  background: #ffffff;
  color: #1f2937;
  border: 1px solid #d1d5db;
}

.tab-button.active {
  background: #2563eb;
  border-color: #1d4ed8;
  color: #ffffff;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.8rem;
  align-items: end;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 1rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.92rem;
}

input,
select,
button {
  font: inherit;
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  border: 1px solid #d1d5db;
}

button {
  cursor: pointer;
  border-color: #1d4ed8;
  background: #2563eb;
  color: #ffffff;
  font-weight: 600;
}

button:hover {
  background: #1d4ed8;
}

.status {
  min-height: 1.5rem;
  margin-top: 0.9rem;
  color: #374151;
}

.actions {
  display: flex;
  gap: 0.6rem;
  margin-top: 0.25rem;
}

.actions button {
  background: #ffffff;
  color: #1f2937;
  border: 1px solid #d1d5db;
}

.actions button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.result-card {
  margin-top: 0.75rem;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 0.9rem 1rem;
}

.result-card h2 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.result-list {
  margin: 0;
  color: #111827;
}

.graph-canvas {
  margin-top: 0.8rem;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  min-height: 560px;
  overflow: hidden;
}

.cluster-results {
  margin-top: 0.8rem;
}

.cluster-list {
  margin: 0;
  padding-left: 1.2rem;
}

.cluster-list li {
  margin-bottom: 0.45rem;
}

.cluster-summary {
  margin: 0 0 0.25rem;
  font-weight: 600;
}

.cluster-words {
  margin: 0;
  color: #111827;
  overflow-wrap: anywhere;
}

.cluster-meta {
  margin: 0.25rem 0 0;
  color: #4b5563;
  font-size: 0.85rem;
}