:root {
  color-scheme: light;
  --color-background: #eef2f6;
  --color-surface: #ffffff;
  --color-surface-muted: #f7f9fc;
  --color-border: #c8d2df;
  --color-text: #172033;
  --color-muted: #5e6d82;
  --color-head: #667085;
  --color-left-eye: #2f80c2;
  --color-right-eye: #d46a5b;
  --color-unigaze-ray: #006d6f;
  --color-hit-area: #c43d7a;
  --color-gaze-sphere: #d8dde5;
  --color-warning: #b5532f;
  --shadow-panel: 0 14px 34px rgb(20 31 49 / 12%);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--color-text);
  background: var(--color-background);
}

button,
input {
  font: inherit;
}

.viewer-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 16px;
  min-height: 100vh;
  padding: 16px;
}

.scene-panel,
.control-panel {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface);
  box-shadow: var(--shadow-panel);
}

.scene-panel {
  display: grid;
  grid-template-rows: auto minmax(420px, 1fr);
  min-width: 0;
  overflow: hidden;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 78px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-muted);
}

.title-block {
  min-width: 0;
}

h1,
h2,
p,
dl,
dd {
  margin: 0;
}

h1 {
  margin-bottom: 4px;
  font-size: 1.12rem;
  line-height: 1.25;
  letter-spacing: 0;
}

h1 a,
h1 a:visited {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

h2 {
  font-size: 0.86rem;
  line-height: 1.3;
  letter-spacing: 0;
}

#frame-status {
  color: var(--color-muted);
  font-size: 0.92rem;
  line-height: 1.35;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, max-content);
  gap: 14px;
  text-align: right;
}

.metrics dt,
.status-panel dt {
  color: var(--color-muted);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.2;
  text-transform: uppercase;
}

.metrics dd {
  margin-top: 3px;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.1;
}

.viewport {
  position: relative;
  min-height: 0;
  background: #e7edf4;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 420px;
  outline: none;
}

.fallback-status {
  position: absolute;
  left: 16px;
  bottom: 16px;
  max-width: min(620px, calc(100% - 32px));
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-muted);
  background: rgb(255 255 255 / 94%);
  font-size: 0.92rem;
  line-height: 1.35;
}

.fallback-status[data-state="error"] {
  border-color: #e6a18d;
  color: var(--color-warning);
  background: #fff4ef;
}

.fallback-status[hidden] {
  display: none;
}

.control-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-self: stretch;
  padding: 16px;
  overflow: auto;
}

.control-section,
.status-panel,
.axis-legend {
  display: grid;
  gap: 10px;
}

.frame-number-row {
  display: grid;
  grid-template-columns: 1fr 96px;
  align-items: center;
  gap: 10px;
}

.frame-number-row label,
legend {
  color: var(--color-muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--color-unigaze-ray);
}

input[type="number"] {
  width: 100%;
  min-height: 36px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 6px 8px;
  color: var(--color-text);
  background: var(--color-surface);
}

.button-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

button {
  min-height: 38px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-text);
  background: var(--color-surface-muted);
  cursor: pointer;
}

button:hover:not(:disabled) {
  border-color: var(--color-unigaze-ray);
  color: var(--color-unigaze-ray);
}

button:disabled,
input:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.mode-group,
.toggle-grid,
.status-panel,
.axis-legend {
  margin: 0;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-surface-muted);
}

.mode-group,
.toggle-grid {
  display: grid;
  gap: 10px;
}

.mode-group label,
.toggle-grid label {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 24px;
  color: var(--color-text);
  font-size: 0.92rem;
  line-height: 1.25;
}

.mode-group input,
.toggle-grid input {
  accent-color: var(--color-unigaze-ray);
}

.hit-area-error-row,
.hit-area-opacity-row,
.toggle-grid label.range-control {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(96px, 1.15fr) 54px;
  align-items: center;
  gap: 8px;
}

.hit-area-error-row label,
.hit-area-opacity-row label,
.toggle-grid label.range-control span:first-child {
  min-width: 0;
  color: var(--color-muted);
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.2;
  text-transform: uppercase;
}

.hit-area-error-row output,
.hit-area-opacity-row output,
.toggle-grid label.range-control span:last-child {
  min-width: 0;
  color: var(--color-text);
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
  text-align: right;
}

.status-panel dl {
  display: grid;
  gap: 10px;
}

.status-panel div {
  display: grid;
  gap: 3px;
}

.status-panel dd {
  overflow-wrap: anywhere;
  color: var(--color-text);
  font-size: 0.9rem;
  line-height: 1.35;
}

.axis-legend {
  gap: 8px;
  color: var(--color-muted);
  font-size: 0.88rem;
  line-height: 1.35;
}

.axis-chip {
  display: inline-block;
  width: 12px;
  height: 3px;
  margin-right: 6px;
  vertical-align: middle;
}

.axis-x {
  background: #8a1f2d;
}

.axis-y {
  background: #2f7d32;
}

.axis-z {
  background: #2c5aa0;
}

@media (max-width: 900px) {
  .viewer-shell {
    grid-template-columns: 1fr;
  }

  .control-panel {
    align-self: auto;
  }
}