:root {
  color-scheme: light;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --border: #d8d8d8;
  --accent: #2563eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  background: var(--bg);
  color: var(--fg);
}

.header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}

#app {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
}

.screen.hidden { display: none; }

.dropzone {
  display: block;
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 32px;
  text-align: center;
  cursor: pointer;
  margin-top: 16px;
}

.warning { color: #b45309; }
.error { color: #b91c1c; }
.hidden { display: none; }

.panel-thumbs {
  display: flex;
  gap: 12px;
  margin: 16px 0;
  flex-wrap: wrap;
}

.panel-thumb {
  border: 3px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  padding: 4px;
}

.panel-thumb.selected { border-color: var(--accent); }

.panel-thumb canvas { display: block; max-width: 140px; }

.height-input {
  display: block;
  margin: 16px 0;
}

.scene-container {
  width: 100%;
  max-width: 600px;
  height: 450px;
  border: 1px solid var(--border);
}

button {
  padding: 10px 16px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: white;
  cursor: pointer;
  margin-top: 8px;
}

button:disabled {
  background: #ccc;
  border-color: #ccc;
  cursor: not-allowed;
}