:root {
  color-scheme: light;
  font-family: Inter, "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  background: #e9eef1;
  color: #24313b;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; }
a { color: #126394; }
button, select, input { font: inherit; }
button, select {
  border: 1px solid #a8b7c0;
  border-radius: 7px;
  background: #fff;
  color: inherit;
  padding: 7px 11px;
}
button { cursor: pointer; }
button:hover { border-color: #126394; }
button[aria-pressed="true"] { background: #126394; border-color: #126394; color: #fff; }

.page { max-width: 1220px; margin: 0 auto; padding: 24px; }
.back { display: inline-block; margin-bottom: 12px; text-decoration: none; }
h1 { margin: 4px 0 6px; font-size: clamp(24px, 4vw, 36px); }
.subtle { color: #60717c; }
.download {
  display: inline-block;
  margin: 8px 0 16px;
  padding: 10px 14px;
  border-radius: 7px;
  background: #126394;
  color: #fff;
  text-decoration: none;
}
.variant-navigation {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin: 14px 0 6px;
  padding: 12px 14px;
  border: 1px solid #c7d4da;
  border-radius: 9px;
  background: #f7fafb;
}
.variant-navigation label { font-weight: 700; }
.variant-navigation select { min-width: 190px; }
.variant-navigation .subtle { font-size: 14px; }

.preview-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 18px;
  align-items: start;
}
.stage-card, .panel {
  border: 1px solid #d0dade;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 8px 28px rgb(37 53 64 / 8%);
}
.stage-card { overflow: hidden; }
#pixi-stage {
  display: grid;
  width: 100%;
  min-height: 320px;
  place-items: center;
  overflow: hidden;
  background-color: #fff;
  background-image: conic-gradient(
    #fff 25%,
    #ccc 0 50%,
    #fff 0 75%,
    #ccc 0
  );
  background-position: 0 0;
  background-size: 16px 16px;
}
#pixi-stage[data-background="white"] { background: #fff; }
#pixi-stage[data-background="black"] { background: #000; }
#pixi-stage[data-background="grass"] { background: #596749; }
#pixi-stage canvas { display: block; width: 100%; height: auto; }
#loading { padding: 24px; }
.stage-status { margin: 0; padding: 10px 14px; border-top: 1px solid #d0dade; }

.controls { display: grid; gap: 12px; }
.panel { padding: 14px; }
.panel h2 { margin: 0 0 12px; font-size: 17px; }
.control-row { display: grid; gap: 6px; margin: 9px 0; }
.button-row { display: flex; flex-wrap: wrap; gap: 7px; }
.fps-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 5px 12px;
  margin: 12px 0 8px;
  padding: 9px 10px;
  border-radius: 8px;
  background: #f2f6f8;
  color: #60717c;
}
.fps-grid strong { color: #24313b; font-variant-numeric: tabular-nums; }
.port-list { display: grid; gap: 8px; }
.port-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 8px;
  border-radius: 8px;
  background: #f2f6f8;
}
.port-row label { font-weight: 600; }
.port-row small { display: block; color: #6b7b85; font-weight: 400; }
.ring-row { margin-top: 12px; padding-top: 12px; border-top: 1px solid #d7e0e4; }
.switch { display: flex; align-items: center; gap: 8px; }
.metadata { margin-top: 18px; line-height: 1.9; }
.status-light-list { margin: 8px 0; padding-left: 20px; color: #455761; }
.error { color: #a02b2b; }
[hidden] { display: none !important; }

@media (max-width: 820px) {
  .page { padding: 16px; }
  .preview-layout { grid-template-columns: 1fr; }
  .controls { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
}