body {
  margin: 0;
  font-family: sans-serif;
  background: #f4f1e6;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

#game-container {
  background: #8b5e3c;
  padding: 20px;
  border-radius: 20px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
  border: 5px solid #deb887;
  margin: 20px;
}

#timer {
  color: white;
  font-size: 24px;
  text-align: center;
  margin-bottom: 15px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 100px);
  grid-gap: 5px;
}

.tile {
  width: 100px;
  height: 100px;
  background: #d8a15f;
  color: #2e2e2e;
  font-size: 32px;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  box-shadow: inset 0 -2px 4px #a45b23;
  user-select: none;
}

.empty {
  background: none;
  box-shadow: none;
}

.popup {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 999;
  display: none;
}

.popup-content {
  background: white;
  padding: 20px 30px;
  border-radius: 10px;
  text-align: center;
}

.popup-content button {
  padding: 10px 20px;
  margin-top: 10px;
  font-size: 16px;
  background: #8b5e3c;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}