:root {
  --bg: #f7f8fa; --fg: #1b1f24; --muted: #667085; --card: #fff; --line: #e3e6eb;
  --accent: #2563eb; --accent-fg: #fff;
  --ok: #15803d; --ok-bg: #dcfce7; --bad: #b91c1c; --bad-bg: #fee2e2; --idle-bg: #eef0f4;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216; --fg: #e6e9ee; --muted: #98a2b3; --card: #171b21; --line: #2a303a;
    --accent: #5b8def; --accent-fg: #0b0e12;
    --ok: #4ade80; --ok-bg: #12301f; --bad: #f87171; --bad-bg: #3a1618; --idle-bg: #252b34;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 14px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; }
.layout { display: grid; grid-template-columns: minmax(320px, 2fr) 3fr; gap: 16px; padding: 16px; min-height: 100vh; }
.panel { min-width: 0; }
h1 { font-size: 18px; margin: 0; }
.head-top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; margin-bottom: 4px; }
.meta { color: var(--muted); }
.row { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; margin: 8px 0; }
.check { display: flex; gap: 6px; align-items: center; }
input, select, textarea { font: inherit; color: var(--fg); background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 4px 6px; }
input[type=color] { padding: 0 2px; height: 30px; width: 40px; }
#build { max-width: 22rem; }
textarea { width: 100%; font: 12px var(--mono); padding: 8px; }
button { font: inherit; border-radius: 6px; border: 1px solid var(--line); background: var(--card); color: var(--fg); padding: 5px 12px; cursor: pointer; }
button.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 600; }
.frame iframe { width: 100%; height: calc(100vh - 32px); min-height: 420px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.status { padding: 4px 8px; border-radius: 6px; background: var(--idle-bg); font-weight: 600; }
.status[data-state=initialized], .status[data-state=sceneApplied] { background: var(--ok-bg); color: var(--ok); }
.status[data-state=error] { background: var(--bad-bg); color: var(--bad); }
.detail { font: 12px var(--mono); white-space: pre-wrap; margin: 4px 0; }
.small { margin: 4px 0; font-size: 12px; }
.small a { color: inherit; }
@media (max-width: 900px) { .layout { grid-template-columns: 1fr; } .frame iframe { height: 70vh; } }