* {
  box-sizing: border-box;
}

html,
body,
#root {
  height: 100%;
  margin: 0;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  color: #e2e5ea;
  background: #161a22;
}

.app {
  display: flex;
  height: 100%;
}

.sidebar {
  width: 340px;
  flex-shrink: 0;
  overflow-y: auto;
  padding: 20px;
  background: #1e2128;
  border-right: 1px solid #2c313a;
}

.sidebar h1 {
  margin: 0 0 4px;
  font-size: 20px;
  color: #fff;
}

.tagline {
  margin: 0 0 10px;
  color: #9aa1ac;
  font-size: 13px;
  line-height: 1.45;
}

.tagline a {
  color: #9b8bff;
}

.engine-status {
  margin: 0 0 16px;
  font-size: 12px;
  color: #9aa1ac;
}

.engine-status.loading {
  color: #ecc477;
}
.engine-status.ready {
  color: #8fd7ab;
}
.engine-status.error {
  color: #f2a3a3;
}

.sidebar section {
  margin-bottom: 22px;
}

.sidebar h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #7f8794;
  margin: 0 0 8px;
}

button {
  font: inherit;
  padding: 7px 12px;
  border-radius: 6px;
  border: 1px solid #3a4150;
  background: #2a2f39;
  color: #e2e5ea;
  cursor: pointer;
}

button:hover:not(:disabled) {
  background: #333947;
}

button:disabled {
  opacity: 0.5;
  cursor: default;
}

.primitive-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 10px;
}

.button-row {
  display: flex;
  gap: 8px;
}

.button-row button {
  flex: 1;
}

button.primary {
  margin-top: 10px;
  width: 100%;
  background: #6a44c8;
  border-color: #6a44c8;
  color: #fff;
  font-weight: 600;
}

button.primary:hover:not(:disabled) {
  background: #7a54d8;
}

button.subtle {
  margin-top: 8px;
  padding: 3px 8px;
  font-size: 12px;
  color: #9aa1ac;
  background: transparent;
  border-color: #2c313a;
}

select {
  font: inherit;
  width: 100%;
  padding: 7px 8px;
  border-radius: 6px;
  border: 1px solid #3a4150;
  background: #2a2f39;
  color: #e2e5ea;
}

.error {
  margin-top: 10px;
  padding: 8px 10px;
  border-radius: 6px;
  background: rgba(220, 70, 70, 0.12);
  border: 1px solid rgba(220, 70, 70, 0.45);
  color: #f2a3a3;
  font-size: 13px;
  white-space: pre-wrap;
}

.busy {
  margin-top: 10px;
  color: #ecc477;
  font-size: 13px;
}

.mesh-info {
  font-size: 13px;
  line-height: 1.55;
}

.mesh-info .source {
  color: #7f8794;
  font-size: 12px;
  margin-bottom: 4px;
  overflow-wrap: anywhere;
}

.chip {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
  border: 1px solid #3a4150;
  color: #b3b9c2;
}

.chip.on {
  color: #a8d5b8;
  border-color: rgba(80, 190, 120, 0.5);
}

.view-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border: 1px solid #3a4150;
  border-radius: 6px;
  overflow: hidden;
}

.view-toolbar button {
  flex: 1 1 auto;
  border: none;
  border-radius: 0;
  background: transparent;
  padding: 6px 8px;
  font-size: 12px;
  color: #9aa1ac;
}

.view-toolbar button + button {
  border-left: 1px solid #3a4150;
}

.view-toolbar button.active {
  background: rgba(106, 68, 200, 0.4);
  color: #e7ddff;
}

.slider {
  display: block;
  margin: 12px 0 0;
}

.slider > span {
  display: block;
  font-size: 12.5px;
  color: #9aa1ac;
  margin-bottom: 4px;
}

.slider input[type='range'] {
  width: 100%;
}

.footnote {
  margin: 8px 0 0;
  color: #6b7280;
  font-size: 12px;
  line-height: 1.45;
}

.viewport {
  flex: 1;
  min-width: 0;
  position: relative;
}

.view-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #6b7280;
  font-size: 15px;
  pointer-events: none;
}