* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top, #28323e, #11161d 60%);
  color: #f4f7fb;
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 18px 16px 28px;
}

h1 {
  margin: 6px 0;
  font-size: 2rem;
}

.tagline {
  margin-top: 0;
  color: #c5d4e7;
}

.hud {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 10px;
  font-size: 1rem;
}

#gameCanvas {
  width: 100%;
  border: 3px solid #3e4b59;
  border-radius: 10px;
  background: #222a33;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
}

.controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}

button {
  border: none;
  border-radius: 8px;
  padding: 10px 14px;
  background: #56b6c2;
  color: #0e1820;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.1);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.hint {
  color: #c5d4e7;
}

.notes {
  margin-top: 8px;
  color: #afc4db;
  font-size: 0.95rem;
}

code {
  background: rgba(0, 0, 0, 0.3);
  padding: 1px 5px;
  border-radius: 5px;
}