:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --panel: #ffffff;
  --text: #1c2430;
  --muted: #637487;
  --accent: #1463ff;
  --ok: #1f9d55;
  --warn: #d94841;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  font-family: "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
  background: radial-gradient(circle at 20% 10%, #ffffff, var(--bg));
  color: var(--text);
}

.app {
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 12px;
  padding: 16px;
}

.toolbar {
  background: var(--panel);
  border: 1px solid #dbe3ee;
  border-radius: 12px;
  padding: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.controls {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.file-label,
button {
  border: 1px solid #c7d4e4;
  border-radius: 8px;
  padding: 8px 12px;
  background: #fff;
  font-size: 14px;
}

.file-label {
  cursor: pointer;
}

#fileInput {
  width: 220px;
  font-size: 14px;
}

button {
  cursor: pointer;
}

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

.status-wrap {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.status,
.stats {
  margin: 0;
  font-size: 13px;
}

.status.info {
  color: var(--muted);
}

.status.ok {
  color: var(--ok);
}

.status.err {
  color: var(--warn);
}

.viewer-container {
  display: flex;
  flex-direction: row;
  gap: 16px;
  min-height: 480px;
}

.viewer-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 300px;
}

.viewer-title {
  margin: 0;
  font-size: 15px;
  color: #334155;
  text-align: center;
  font-weight: 600;
}

.viewer-wrap {
  flex: 1;
  border: 1px solid #dbe3ee;
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(180deg, #fefeff 0%, #f6f9ff 100%);
  position: relative;
}

#viewerCanvas2D,
#viewerCanvas3D {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  display: block;
}

.tips {
  font-size: 12px;
  color: var(--muted);
  text-align: center;
  padding: 4px 0 8px;
}