body {
  font-family: "Segoe UI", sans-serif;
  background: #f8fafc;
  text-align: center;
  padding: 20px;
  color: #333;
}

.controls {
  margin: 15px 0;
}

button {
  margin: 5px;
  padding: 10px 20px;
  font-size: 16px;
  background: white;          /* 背景を白に */
  color: black;               /* 文字を黒に */
  border: 1px solid black;    /* 枠線を黒に */
  border-radius: 6px;
  cursor: pointer;
  transition: 0.2s;
}

/* マウスを乗せたときの見た目 */
button:hover {
  background: #f0f0f0;        /* 少しグレーにして反応が分かるように */
}


.slider-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 20px auto;
  max-width: 400px;
}

label {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

input[type="range"] {
  width: 150px;
}

#result {
  margin-top: 20px;
  background: #eef2ff;
  border-radius: 8px;
  padding: 15px;
}

#feedback p {
  margin: 4px 0;
}

#adsrCanvas {
  background: #fff;
  border: 1px solid #ccc;
  border-radius: 6px;
  margin-top: 10px;
}

.back-button {
  display: inline-block;
  margin-top: 30px;
  padding: 10px 20px;
  font-size: 1rem;
  background-color: #e2e8f0;
  border: 1px solid #ccc;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.2s;
}
.back-button:hover {
  background-color: #cbd5e1;
}