:root {
  --bg: #080b12;
  --panel: #121826;
  --btn: #1c2536;
  --btn-hover: #26314a;
  --border: #2a3550;
  --fg: #eaf1ff;
  --muted: #93a3c4;
  --accent: #46b7e0;
  --accent-hover: #63c6ea;
  --accent-ink: #06222e;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
  overscroll-behavior: none;
}

.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  padding: .6rem clamp(.8rem, 3vw, 1.6rem);
  border-bottom: 1px solid var(--border);
  background: rgba(8, 11, 18, .72);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.topbar .left { display: flex; align-items: center; gap: .7rem; }
.topbar .back {
  color: var(--fg); text-decoration: none; font-size: 1.3rem; line-height: 1;
  width: 34px; height: 34px; display: flex; align-items: center; justify-content: center;
  border-radius: 9px; border: 1px solid var(--border); background: var(--btn);
}
.topbar .back:hover { background: var(--btn-hover); }
.topbar .title { font-weight: 800; letter-spacing: .3px; }
.topbar .title span { color: var(--accent); }

main { position: fixed; inset: 0; }
#game { display: block; width: 100%; height: 100%; touch-action: none; }

/* connection status pill */
.status {
  position: fixed; top: 52px; left: 50%; transform: translateX(-50%); z-index: 4;
  font: 600 13px system-ui; color: var(--muted);
  background: rgba(10, 14, 22, .8); border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 999px; pointer-events: none;
}
.status[hidden] { display: none; }
.status.err { color: #ff9a8a; border-color: rgba(255, 120, 100, .5); }

/* menu overlay */
.menu {
  position: fixed; inset: 0; z-index: 6;
  display: flex; align-items: center; justify-content: center; padding: 1.2rem;
  background: radial-gradient(1200px 700px at 50% 25%, rgba(30, 60, 90, .35), rgba(8, 11, 18, .92));
}
.menu[hidden] { display: none; }
.panel {
  width: min(460px, 100%); text-align: center;
  background: rgba(18, 24, 38, .82); border: 1px solid var(--border);
  border-radius: 18px; padding: 2rem 1.8rem 1.8rem;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .5);
}
.logo { margin: 0 0 .6rem; font-size: 2.1rem; font-weight: 800; letter-spacing: .5px; }
.logo span { color: var(--accent); }
.tag { margin: 0 0 1rem; color: var(--muted); font-size: 1rem; line-height: 1.5; }
.controls { margin: 0 0 1.4rem; color: var(--muted); font-size: .82rem; }
.btn {
  font: 700 1rem system-ui; cursor: pointer;
  padding: .8rem 2rem; border-radius: 12px; border: 1px solid var(--border);
  background: var(--btn); color: var(--fg);
}
.btn:hover { background: var(--btn-hover); }
.btn-primary { background: var(--accent); border-color: transparent; color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent-hover); }
.btn:disabled { opacity: .5; cursor: default; }
.note { margin: 1rem 0 0; min-height: 1.2em; font-size: .85rem; color: var(--muted); }
.note.err { color: #ff9a8a; }