body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #74ebd5, #ACB6E5);
  margin: 0;
  padding: 0;
  text-align: center;
  color: #333;
}

/* Bước */
.step {
  display: none;
  margin-top: 50px;
}
.step.active {
  display: block;
}

button {
  padding: 12px 25px;
  margin-top: 20px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(45deg, #ff4e50, #f9d423);
  color: white;
  font-size: 16px;
  cursor: pointer;
  transition: 0.3s;
  box-shadow: 0 6px 15px rgba(0,0,0,0.2);
}
button:hover {
  transform: scale(1.05);
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

/* Thanh chuyển đổi */
.switch-bar {
  display: flex;
  justify-content: center;
  background: #ccc;
  padding: 10px;
  margin-bottom: 20px;
}
.switch-bar button {
  margin: 0 10px;
  background: #666;
}
.switch-bar button:hover {
  background: #444;
}

/* Panel */
.panel { display: none; }
.panel.active { display: block; }

/* Vòng quay */
.wheel-container {
  position: relative;
  width: 500px;
  height: 500px;
  margin: 0 auto;
}
canvas {
  border-radius: 50%;
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}
.pointer {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-bottom: 40px solid red;
  filter: drop-shadow(0 3px 4px rgba(0,0,0,0.4));
}

#resultText {
  margin-top: 25px;
  font-size: 1.4em;
  font-weight: bold;
  color: #222;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}