* { box-sizing: border-box; margin: 0; padding: 0; }
:root { color-scheme: dark; }
html, body { height: 100%; background: #0c1424; overflow: hidden; }
body { font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; color: #eef2f8; }

/* The site's iframe wrapper sets #chip{display:flex}; make sure [hidden] still wins. */
[hidden] { display: none !important; }

#stage {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
}
#game {
  max-width: 100%; max-height: 100%;
  width: min(100vw, 177.7vh);   /* keep 16:9 */
  aspect-ratio: 960 / 540;
  background: #1b2a4a;
  border-radius: 6px;
  touch-action: none;
  transition: filter .2s;
}

/* Overlay panels */
.panel {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  width: min(420px, 88vw);
  background: rgba(12, 20, 36, .92);
  border: 1px solid rgba(120, 150, 200, .25);
  border-radius: 14px;
  padding: 24px 26px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .5);
  backdrop-filter: blur(3px);
}
.panel h1 { font-size: 30px; margin-bottom: 10px; }
.panel h2 { font-size: 22px; margin-bottom: 12px; }
.tag { color: #c3cede; font-size: 14px; line-height: 1.5; margin-bottom: 18px; }
.muted { color: #8494ab; }
.small { font-size: 12px; }
.err { color: #ff7a6b; }

.btn {
  display: block; width: 100%; margin: 8px 0;
  padding: 12px 16px; border: 0; border-radius: 10px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  background: #24344f; color: #eef2f8; transition: transform .05s, background .15s;
}
.btn:hover { background: #2d4160; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: #3f7bd6; }
.btn.primary:hover { background: #4a88e8; }
.btn.ghost { background: transparent; color: #9fb0c8; }
.btn.ghost:hover { background: rgba(255, 255, 255, .05); }
.btn:disabled { opacity: .45; cursor: not-allowed; }

.controls { margin-top: 14px; }

.code {
  font-size: 15px; margin: 12px 0; color: #c3cede;
}
.code span { font-family: ui-monospace, Menlo, monospace; font-size: 22px; letter-spacing: 3px; color: #ffd76b; font-weight: 700; }

.join-row { display: flex; gap: 8px; margin: 8px 0; }
.join-row input {
  flex: 1; padding: 12px; border-radius: 10px; border: 1px solid rgba(120, 150, 200, .35);
  background: #0f1a2e; color: #fff; font-size: 18px; text-align: center;
  font-family: ui-monospace, Menlo, monospace; letter-spacing: 4px; text-transform: uppercase;
}
.join-row .btn { width: auto; margin: 0; padding: 12px 18px; }

.stat { display: flex; justify-content: space-between; align-items: baseline; padding: 8px 4px; border-bottom: 1px solid rgba(120, 150, 200, .15); }
.stat span { color: #8494ab; font-size: 13px; }
.stat b { font-size: 18px; }
.stat b#overScore { color: #ffd76b; }

/* ---- upgrade shop ---- */
.panel.wide { width: min(620px, 94vw); max-height: 92vh; overflow-y: auto; }
.skulls { color: #ffd76b; font-weight: 700; }
.skull-line { color: #ffd76b; font-weight: 800; font-size: 20px; margin-bottom: 6px; }
.panel h1 { font-size: 26px; margin-bottom: 8px; }
.panel .tag { margin-bottom: 10px; }
.shop-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px;
  margin: 14px 0 16px; text-align: left;
}
@media (max-width: 460px) { .shop-grid { grid-template-columns: 1fr; } }
.up-btn {
  display: grid; grid-template-columns: 30px 1fr auto; align-items: center; gap: 4px 8px;
  padding: 9px 11px; border: 1px solid rgba(120, 150, 200, .28); border-radius: 10px;
  background: #1a2740; color: #eef2f8; cursor: pointer; text-align: left; transition: background .12s;
}
.up-btn:hover:not(.off) { background: #223357; }
.up-btn.off { opacity: .5; cursor: not-allowed; }
.up-ic { grid-row: 1 / 3; font-size: 20px; text-align: center; }
.up-name { font-weight: 600; font-size: 14px; }
.up-name em { color: #8fd0ff; font-style: normal; font-size: 11px; font-weight: 700; }
.up-desc { grid-column: 2; color: #93a3ba; font-size: 11px; }
.up-cost { grid-row: 1 / 3; grid-column: 3; color: #ffd76b; font-weight: 700; font-size: 13px; white-space: nowrap; }