* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; }
body {
  display: flex; flex-direction: column;
  background: #0b1220; color: #e5e7eb;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  height: 100dvh; overflow: hidden;
  -webkit-user-select: none; user-select: none;
}
.topbar {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px; padding-top: calc(8px + env(safe-area-inset-top));
  background: #111827; border-bottom: 1px solid #1f2937;
}
.brand { font-weight: 700; font-size: 15px; white-space: nowrap; margin-right: auto; letter-spacing: .02em; color: #22d3ee; }
.tools { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.btn {
  appearance: none; border: 1px solid #374151; background: #1f2937; color: #e5e7eb;
  border-radius: 8px; padding: 7px 11px; font-size: 13px; font-family: inherit;
  cursor: pointer; white-space: nowrap;
}
.btn:active { background: #374151; }
.btn.primary { background: #2563eb; border-color: #2563eb; }
.btn.active { background: #059669; border-color: #059669; }
#stage { position: relative; flex: 1; overflow: hidden; background: #05070d; touch-action: none; }
#canvas { display: block; width: 100%; height: 100%; touch-action: none; }
.hint {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  color: #64748b; font-size: 14px; line-height: 1.8; text-align: center; padding: 0 24px;
  pointer-events: none;
}
.hint.hidden { display: none; }
.readout {
  display: flex; align-items: center; gap: 12px;
  padding: 8px 14px; padding-bottom: calc(8px + env(safe-area-inset-bottom));
  background: #111827; border-top: 1px solid #1f2937;
}
.mode { font-size: 13px; color: #9ca3af; flex: 1; }
.angle { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 26px; color: #22d3ee; }
.angle .deg { font-size: 16px; margin-left: 2px; }
.more-panel {
  position: absolute; right: 10px; top: calc(50px + env(safe-area-inset-top)); z-index: 20;
  width: 272px; max-width: calc(100vw - 20px);
  background: rgba(17,24,39,.96); border: 1px solid #1f2937; border-radius: 12px;
  padding: 12px; display: flex; flex-direction: column; gap: 10px;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.more-panel.hidden { display: none; }
.more-panel .row { display: flex; align-items: center; gap: 8px; font-size: 13px; color: #cbd5e1; }
.more-panel .row input[type=range] { flex: 1; min-width: 0; }
.more-panel .chk { gap: 6px; }
.more-panel .seg { gap: 6px; }
.more-panel .seg .btn { flex: 1; padding: 7px 6px; }
.scale-info { font-size: 12px; color: #94a3b8; line-height: 1.6; }
.scale-info.tip { color: #64748b; border-top: 1px solid #1f2937; padding-top: 8px; }
@media (max-width: 560px) {
  .brand { display: none; }
  .btn { padding: 7px 9px; font-size: 12.5px; }
}