[hidden] { display: none !important; }
:root {
  --bg: #f7f6f2; --panel: #ffffff; --ink: #1d232a; --muted: #5b6570; --line: #d9dde1;
  --accent: var(--rs-primary, #1e5bc6); --accent-ink: #ffffff; --wall: #e9e4da; --cta: #eef4ff;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14181c; --panel: #1c2228; --ink: #e8ecef; --muted: #a3adb7; --line: #33404b;
    --accent: #4c8dff; --accent-ink: #0b1220; --cta: #1b2a40;
  }
}
:root[data-theme="dark"] {
  --bg: #14181c; --panel: #1c2228; --ink: #e8ecef; --muted: #a3adb7; --line: #33404b;
  --accent: #4c8dff; --accent-ink: #0b1220; --cta: #1b2a40;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
.top, .foot { max-width: 1200px; margin: 0 auto; padding: 16px; }
.off { visibility: hidden; }
h1 { margin: 8px 0; font-size: 1.7rem; }
h2 { margin: 0 0 8px; font-size: 1.15rem; }
.lede, .hint, .foot { color: var(--muted); }
.lede strong { color: var(--ink); }
.grid { max-width: 1200px; margin: 0 auto; padding: 0 16px 16px; display: grid; gap: 16px; grid-template-columns: 1fr 1fr; }
@media (max-width: 860px) { .grid { grid-template-columns: 1fr; } }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 16px; min-width: 0; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 8px 0; }
label { display: inline-flex; gap: 6px; align-items: center; flex-wrap: wrap; }
input { font: inherit; padding: 4px 6px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--ink); max-width: 100%; }
button, .btn { font: inherit; padding: 6px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--ink); cursor: pointer; text-decoration: none; display: inline-block; }
.mode.on, .btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.file { display: block; }
.status { min-height: 3em; font-weight: 600; }
.stage { border: 1px solid var(--line); border-radius: 6px; overflow: hidden; background: #fff; }
#plan { display: block; width: 100%; height: auto; cursor: crosshair; touch-action: manipulation; }
.stage3d { border: 1px solid var(--line); border-radius: 6px; overflow: hidden; aspect-ratio: 4 / 3; background: #dfe6ec; }
#view { display: block; width: 100%; height: 100%; touch-action: none; cursor: grab; }
.stats { color: var(--muted); }
.cta { margin-top: 16px; padding: 16px; background: var(--cta); border-radius: 8px; }
.cta h3 { margin: 0 0 6px; font-size: 1.05rem; }