body {
  font-family: 'Helvetica Neue', sans-serif;
  background: #f9f9f9;
  color: #333;
  margin: 0;
  padding: 0;
}

header {
  background: #f38020;
  color: white;
  padding: 1rem;
  display: flex;
  align-items: center;
  max-width: 800px;
  margin: 0 auto;
}

.logo {
  height: 40px;
  margin-right: 10px;
}

h1 {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

#categories {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 20px;
}

#categories button {
  padding: 8px 12px;
  background: #f38020;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

#categories button:hover {
  background: #d96d1f;
}

/* 全体の最大幅制限 */
main {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}

/* 動画リストの表示スタイル */
#video-list {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-top: 20px;
}

/* 各動画アイテム */
#video-list div {
  width: 600px;
  cursor: pointer;
  text-align: center;
  background: #fff;
  padding: 10px;
  border-radius: 8px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
  transition: transform 0.2s ease;
}

#video-list div:hover {
  transform: scale(1.05);
}

#video-list img {
  width: 100%;
  border-radius: 6px;
}

#player {
	padding: 1rem;
  margin: 1rem;
  max-width: 640px;
  max-height: 660px;
  margin: 20px auto;
  border: 1px solid #ccc;
  border-radius: 8px;
  overflow: hidden;
}

iframe {
  width: 100%;
  border: none;
  border-radius: 8px;
  aspect-ratio: 16 / 9;
}