:root {
  color-scheme: dark;
  --ink: #e9f7ff;
  --muted: #8ca4b4;
  --panel: rgba(10, 23, 39, 0.84);
  --line: rgba(127, 219, 255, 0.16);
  --cyan: #77ecff;
  --pink: #ff6ec7;
  --yellow: #ffe66d;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background: #050b16;
  color: var(--ink);
  font-family: "Segoe UI", system-ui, sans-serif;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 15% 10%, rgba(119, 236, 255, 0.13), transparent 28rem),
    radial-gradient(circle at 90% 85%, rgba(255, 110, 199, 0.1), transparent 24rem);
  content: "";
}

.game-shell { width: min(940px, calc(100% - 32px)); margin: 0 auto; padding: 48px 0 24px; }
.topbar, .status-row, footer { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.eyebrow, .scoreboard span, footer, .signal { color: var(--muted); font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase; }
h1 { margin: 7px 0 0; font-size: clamp(2.2rem, 7vw, 4.5rem); letter-spacing: -0.07em; line-height: 0.9; }
.scoreboard { display: flex; gap: 26px; text-align: right; }
.scoreboard div { display: grid; gap: 6px; }
.scoreboard strong { color: var(--cyan); font-size: 1.8rem; line-height: 1; }
.game-card { margin-top: 40px; padding: 16px; border: 1px solid var(--line); border-radius: 20px; background: var(--panel); box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35); backdrop-filter: blur(12px); }
.status-row { padding: 0 6px 13px; color: var(--muted); font-size: 0.86rem; }
.status-row p { margin: 0; }
.controls-hint { display: flex; align-items: center; gap: 5px; }
kbd { padding: 3px 7px; border: 1px solid var(--line); border-radius: 5px; color: var(--ink); font-size: 0.72rem; }
.canvas-wrap { position: relative; overflow: hidden; border-radius: 12px; background: #081323; }
canvas { display: block; width: 100%; height: auto; }
.overlay { position: absolute; inset: 0; display: grid; place-items: center; padding: 24px; background: rgba(3, 10, 20, 0.7); }
.overlay.hidden { display: none; }
.overlay-panel { max-width: 430px; text-align: center; }
.signal { color: var(--pink); }
.overlay h2 { margin: 15px 0 10px; font-size: clamp(1.7rem, 4vw, 2.8rem); letter-spacing: -0.05em; }
.overlay p { margin: 0 auto 24px; color: var(--muted); line-height: 1.6; }
button { border: 0; border-radius: 999px; background: var(--cyan); color: #04111c; cursor: pointer; font: inherit; font-weight: 800; transition: transform 160ms ease, box-shadow 160ms ease; }
button:hover { box-shadow: 0 0 25px rgba(119, 236, 255, 0.4); transform: translateY(-2px); }
#start-button { padding: 13px 24px; }
.mobile-controls { display: none; gap: 12px; padding-top: 14px; }
.mobile-controls button { flex: 1; padding: 12px; font-size: 1.4rem; }
footer { padding: 18px 4px 0; }

@media (max-width: 620px) {
  .game-shell { padding-top: 28px; }
  .topbar { align-items: flex-end; }
  .scoreboard { gap: 14px; }
  .scoreboard strong { font-size: 1.4rem; }
  .controls-hint { display: none; }
  .mobile-controls { display: flex; }
  footer { align-items: flex-start; flex-direction: column; gap: 7px; }
}