* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top left, #1e3a8a 0%, #0f172a 45%, #020617 100%);
  color: #f8fafc;
  min-height: 100vh;
}

.page-shell {
  width: min(1100px, calc(100% - 28px));
  margin: 0 auto;
  padding: 18px 0 28px;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.back-link {
  color: #bfdbfe;
  text-decoration: none;
  border: 1px solid rgba(191, 219, 254, 0.35);
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.45);
}

.brand {
  font-size: 13px;
  letter-spacing: 0.18em;
  color: #93c5fd;
  font-weight: 700;
}

.hero {
  text-align: center;
  margin-bottom: 18px;
}

.eyebrow {
  color: #38bdf8;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 12px;
  font-weight: 700;
  margin: 0 0 8px;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1;
}

.subtitle {
  color: #cbd5e1;
  margin: 12px auto 0;
  max-width: 620px;
}

.game-panel {
  background: rgba(15, 23, 42, 0.72);
  border: 1px solid rgba(148, 163, 184, 0.22);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  border-radius: 24px;
  padding: 16px;
}

canvas {
  display: block;
  width: 100%;
  max-height: 500px;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.96), rgba(2, 6, 23, 0.98));
  border-radius: 18px;
  border: 1px solid rgba(59, 130, 246, 0.35);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 12px;
  color: #cbd5e1;
  font-size: 14px;
}

.controls span {
  background: rgba(30, 41, 59, 0.85);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 999px;
  padding: 8px 12px;
}

.controls strong { color: #67e8f9; }

@media (max-width: 640px) {
  .top-bar { flex-direction: column; align-items: stretch; text-align: center; }
  .game-panel { padding: 10px; border-radius: 18px; }
}