/* 全体の背景グラデーション */
body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 100vh;
  margin: 0;
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  color: #fff;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  padding: 20px;
}

h1 {
  margin-bottom: 20px;
  font-weight: 700;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.7);
  user-select: none;
}

/* 操作エリア 横並び */
.controls {
  display: flex;
  gap: 15px;
  align-items: center;
  margin-bottom: 15px;
  flex-wrap: wrap;
  user-select: none;
}

label {
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

select {
  padding: 6px 12px;
  border-radius: 8px;
  border: none;
  font-size: 16px;
  cursor: pointer;
  background-color: #1f3a5f;
  color: #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  transition: background-color 0.3s ease;
}

select:hover,
select:focus {
  background-color: #305a8c;
  outline: none;
}

button {
  padding: 12px 28px;
  font-size: 18px;
  font-weight: 700;
  border-radius: 10px;
  border: none;
  background: #00c896;
  color: white;
  cursor: pointer;
  box-shadow: 0 6px 12px rgba(0, 200, 150, 0.6);
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
  user-select: none;
}

button:hover {
  background-color: #00a67e;
  box-shadow: 0 8px 20px rgba(0, 166, 126, 0.8);
}

button:active {
  background-color: #007651;
  box-shadow: 0 4px 8px rgba(0, 118, 81, 0.8);
  transform: translateY(2px);
}

/* videoとcanvasのスタイル */
video {
  border-radius: 14px;
  max-width: 90vw;
  max-height: 60vh;
  background-color: #000;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  user-select: none;
}

canvas {
  display: none;
}

/* 撮影ボタンは動画下に幅広で大きく */
#snapBtn {
  margin-top: 24px;
  width: 220px;
  align-self: center;
}

/* スマホなど小画面時にレスポンシブ */
@media (max-width: 480px) {
  .controls {
    flex-direction: column;
    gap: 12px;
  }

  #snapBtn {
    width: 100%;
  }
}