:root {
  color-scheme: light;
  --blue: #1769d2;
  --ink: #172033;
  --muted: #627084;
  --line: #d8dee8;
  --panel: #f7f9fc;
  --soft: #eef3fa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: #ffffff;
}

.viewer-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto auto 1fr;
}

.viewer-topbar,
.viewer-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}

.viewer-topbar {
  justify-content: space-between;
  background: #ffffff;
}

.brand {
  font-weight: 800;
  color: var(--blue);
  text-decoration: none;
  font-size: 20px;
}

.subtitle {
  color: var(--muted);
  margin-left: 10px;
  font-size: 14px;
}

.conversion-link,
.toolbar-link {
  color: var(--blue);
  text-decoration: none;
  font-weight: 700;
}

.viewer-toolbar {
  flex-wrap: wrap;
  background: var(--panel);
}

.viewer-project-info {
  margin-left: auto;
  color: var(--muted);
  font-weight: 700;
  font-size: 14px;
}

.viewer-content {
  min-height: 0;
  display: grid;
  grid-template-columns: 284px minmax(0, 1fr);
}

.viewer-sidebar {
  border-right: 1px solid var(--line);
  background: #ffffff;
  padding: 14px;
  overflow: auto;
}

.viewer-sidebar-title {
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 12px;
}

.sidebar-group {
  margin-bottom: 14px;
}

.sidebar-label {
  font-size: 12px;
  font-weight: 800;
  color: var(--muted);
  margin-bottom: 7px;
}

.viewer-stage {
  position: relative;
  min-height: 0;
  height: calc(100vh - 106px);
  background: #ffffff;
}

button,
.file-button,
.toolbar-link {
  appearance: none;
  border: 1px solid #b8c4d5;
  background: #ffffff;
  color: var(--ink);
  border-radius: 7px;
  padding: 9px 12px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.toolbar-link {
  display: inline-block;
  color: var(--blue);
}

button:disabled,
select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.file-button input { display: none; }

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid #aebbd0;
  border-radius: 8px;
  overflow: hidden;
  width: 100%;
}

.segmented button {
  border: 0;
  border-radius: 0;
  min-width: 92px;
}

.segmented button.active {
  background: var(--blue);
  color: #ffffff;
}

.view-picker {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  margin-bottom: 14px;
}

select {
  border: 1px solid #b8c4d5;
  background: #ffffff;
  color: var(--ink);
  border-radius: 7px;
  padding: 8px 10px;
  width: 100%;
  font: inherit;
}

#viewerError,
.error {
  color: #ad1f1f;
  font-weight: 700;
  margin-top: 10px;
}

.notes {
  color: #7a4d00;
  font-size: 13px;
  line-height: 1.4;
}

#plotlyHost,
#vtkHost {
  position: absolute;
  inset: 0;
  display: none;
}

#emptyState {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  text-align: center;
  gap: 8px;
  color: var(--muted);
  padding: 24px;
}

#emptyState strong {
  color: var(--ink);
  font-size: 22px;
}

.marker-panel {
  display: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: var(--soft);
  margin-top: 12px;
}

.marker-panel.active {
  display: block;
}

.marker-panel button {
  margin: 6px 8px 6px 0;
}

.marker-note {
  color: var(--muted);
  margin: 0 0 8px 0;
  font-size: 13px;
}

@media (max-width: 760px) {
  .viewer-topbar,
  .viewer-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .viewer-project-info {
    margin-left: 0;
  }

  .viewer-content {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .viewer-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .viewer-stage {
    height: calc(100vh - 360px);
    min-height: 420px;
  }
}