:root {
  --bg: #f5f6f7; --panel: #fff; --ink: #1d2126; --muted: #5d6670; --line: #d9dde2; --accent: #1f6feb; --warn-bg: #fff4e0; --warn-ink: #7a4b00; --err-bg: #fde7e7; --err-ink: #8a1c1c; --ok-bg: #e7f6ec; --ok-ink: #17602e;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #15181c; --panel: #1e2227; --ink: #e8ebee; --muted: #9aa3ad; --line: #343a41; --accent: #6ea8fe; --warn-bg: #3c2d10; --warn-ink: #f4cf8d; --err-bg: #431d1d; --err-ink: #f7b3b3; --ok-bg: #173423; --ok-ink: #a6e3b8; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
header { padding: 14px 16px 6px; }
h1 { margin: 0; font-size: 20px; }
header p { margin: 2px 0 0; color: var(--muted); font-size: 13px; }
main { display: grid; grid-template-columns: minmax(0, 1fr) 420px; gap: 14px; padding: 10px 16px 24px; align-items: start; }
.stage, .panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px; min-width: 0; }
.canvasWrap { position: relative; width: 100%; aspect-ratio: 16 / 9; background: #000; border-radius: 6px; overflow: hidden; touch-action: none; }
#canvas { width: 100%; height: 100%; display: block; }
.busy { position: absolute; left: 8px; top: 8px; background: rgba(0, 0, 0, .7); color: #fff; padding: 4px 10px; border-radius: 4px; font-size: 13px; }
.row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin: 8px 0; }
.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px 14px; margin: 8px 0; }
label { display: block; font-size: 13px; color: var(--muted); margin: 6px 0; }
label.check { display: inline-flex; align-items: center; gap: 4px; margin: 0; color: var(--ink); }
label.range { display: grid; grid-template-columns: 110px minmax(0, 1fr) 54px; align-items: center; gap: 6px; }
label.range output { text-align: right; font-variant-numeric: tabular-nums; color: var(--ink); }
input[type=range] { width: 100%; }
select, input[type=text] { width: 100%; font: inherit; padding: 4px 6px; border: 1px solid var(--line); border-radius: 5px; background: var(--panel); color: var(--ink); }
label.check select { width: auto; }
.row label { flex: 1 1 140px; margin: 0; }
.row label.check { flex: 0 0 auto; }
button { font: inherit; padding: 5px 12px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); border-radius: 6px; cursor: pointer; }
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
button.primary, #download:not(:disabled) { background: var(--accent); border-color: var(--accent); color: #fff; }
.tabs button.on { background: var(--accent); border-color: var(--accent); color: #fff; }
details { border-top: 1px solid var(--line); padding: 8px 0; }
details:first-child { border-top: 0; padding-top: 0; }
summary { font-weight: 600; cursor: pointer; padding: 2px 0; }
.drop { margin: 8px 0; padding: 18px 12px; border: 2px dashed var(--line); border-radius: 8px; text-align: center; cursor: pointer; }
.drop.small { padding: 10px; }
.drop.over { border-color: var(--accent); background: rgba(31, 111, 235, .08); }
.drop span { display: block; color: var(--muted); font-size: 13px; }
.files { list-style: none; margin: 6px 0; padding: 0; font-size: 13px; }
.files li { padding: 2px 0; overflow-wrap: anywhere; }
.files .err { color: var(--err-ink); }
.hint, .note { color: var(--muted); font-size: 12.5px; margin: 6px 0; }
.partsView { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 10px; }
#partCanvas { width: 180px; height: 230px; background: #2a2f35; border-radius: 6px; cursor: crosshair; touch-action: manipulation; }
#uvCanvas { width: 100%; height: auto; aspect-ratio: 1; background: #333; border-radius: 6px; display: block; }
.legend { display: flex; flex-wrap: wrap; gap: 3px 10px; font-size: 12px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 4px; vertical-align: -1px; }
.stats { font-size: 13px; }
.stats table { width: 100%; border-collapse: collapse; margin-top: 6px; font-variant-numeric: tabular-nums; }
.stats td, .stats th { padding: 2px 6px; border-bottom: 1px solid var(--line); text-align: right; font-weight: 400; }
.stats th:first-child, .stats td:first-child { text-align: left; }
.warnings div { margin-top: 6px; padding: 6px 10px; border-radius: 6px; font-size: 13px; background: var(--warn-bg); color: var(--warn-ink); }
.warnings div.ok { background: var(--ok-bg); color: var(--ok-ink); }
.warnings div.error { background: var(--err-bg); color: var(--err-ink); }
.hideBattle[hidden] { display: none; }
@media (max-width: 900px) {
  main { grid-template-columns: minmax(0, 1fr); padding: 8px 8px 20px; }
  .grid2 { grid-template-columns: minmax(0, 1fr); }
  .stage { position: static; }
  label.range { grid-template-columns: 96px minmax(0, 1fr) 48px; }
}

.btn { display: inline-block; font: inherit; padding: 5px 12px; border: 1px solid var(--line); background: var(--panel); color: var(--ink); border-radius: 6px; text-decoration: none; }
.btn:hover { border-color: var(--accent); }
.report { margin-top: 12px; border-top: 1px solid var(--line); padding-top: 8px; }
.report h2 { font-size: 16px; margin: 0 0 6px; }
#repCounts { font-weight: 400; font-size: 13px; color: var(--muted); margin-left: 6px; }
.item { border: 1px solid var(--line); border-radius: 6px; margin: 6px 0; padding: 0; }
.item summary { font-weight: 400; padding: 6px 10px; }
.item .body { padding: 0 10px 8px; font-size: 13.5px; }
.item ol { margin: 4px 0 8px; padding-left: 20px; }
.chip { display: inline-block; font-size: 11.5px; font-weight: 600; padding: 1px 7px; border-radius: 9px; margin-right: 6px; }
.chip.must { background: var(--err-bg); color: var(--err-ink); }
.chip.warn { background: var(--warn-bg); color: var(--warn-ink); }
.chip.hint { background: rgba(120, 130, 140, .18); color: var(--muted); }
.est { color: var(--muted); font-size: 12px; }
.diff { font-size: 13px; margin-bottom: 6px; }
.diff ul { margin: 2px 0 6px; padding-left: 18px; }
.diff .fixed { color: var(--ok-ink); }
.diff .added { color: var(--err-ink); }
.hlBar { margin-top: 8px; padding: 6px 10px; border-radius: 6px; background: var(--err-bg); color: var(--err-ink); font-size: 13px; }
.spec { font-size: 13.5px; }
.spec h3 { font-size: 14px; margin: 10px 0 2px; }
.spec table { border-collapse: collapse; font-variant-numeric: tabular-nums; width: 100%; }
.spec td, .spec th { border-bottom: 1px solid var(--line); padding: 2px 6px; text-align: left; font-weight: 400; }
.spec ul, .spec ol { margin: 2px 0; padding-left: 18px; }