body {
  background: linear-gradient(120deg, #43cea2 0%, #185a9d 100%);
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  min-height: 100vh;
  text-align: center;
}
h1 {
  color: #185a9d;
  margin-top: 32px;
  margin-bottom: 12px;
  letter-spacing: 2px;
}
.game-container {
  max-width: 400px;
  margin: 0 auto;
  background: #eafaf1;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.10);
  padding: 24px 16px 32px 16px;
}
#board {
  margin-bottom: 18px;
}
.row {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 6px;
}
.slot {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid #185a9d;
  margin: 0 4px;
  background: #fff;
  cursor: pointer;
  transition: border 0.2s;
}
.slot.selected {
  border: 2px solid #43cea2;
}
.feedback {
  display: flex;
  margin-left: 12px;
}
.feedback-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin: 1px;
  background: #bbb;
}
.feedback-dot.black {
  background: #222;
}
.feedback-dot.white {
  background: #fff;
  border: 1px solid #222;
}
#color-palette {
  margin-bottom: 10px;
}
.color-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid #43cea2;
  margin: 0 4px;
  cursor: pointer;
  outline: none;
  transition: border 0.2s;
}
.color-btn.selected {
  border: 2px solid #185a9d;
}
button {
  background: #43cea2;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 28px;
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
  margin: 0 8px;
  transition: background 0.2s;
}
button:hover {
  background: #185a9d;
  color: #fff;
}
@media (max-width: 500px) {
  .game-container { max-width: 98vw; padding: 8vw 2vw 10vw 2vw; }
  .slot, .color-btn { width: 8vw; height: 8vw; }
}