body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  width: 100%;
}

* {
  box-sizing: inherit;
}

header {
  background: #aaa;
  padding: 1rem;
}

.top-image {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0; /* 必要に応じて調整 */
  padding: 0;
}

.top-image {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 0;
  box-shadow: none;
}

.container {
  display: flex;
  flex-direction: row;
  width: 100%;
}

.sidebar, .settings {
  width: 200px;
  padding: 1rem;
  background: #eee;
  height: 100vh;
  overflow-y: auto;
}

main {
  flex: 1;
  padding: 1rem;
  min-width: 0;
}

h2 {
  font-size: 1.5rem;
  margin-top: 2rem;
}

h3 {
  font-size: 1.2rem;
  margin-top: 1.5rem;
}

.video {
  margin: 1rem 0;
}

.sticky {
  position: sticky;
  top: 0;
}

.menu .sub-menu {
  list-style: none;
  padding-left: 1em;
}

.toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-weight: bold;
  margin-top: 1em;
}

input[type="radio"] {
  margin-right: 0.4em;
}

.media-container {
  display: flex;
  align-items: flex-start; /* 上揃え */
  gap: 2rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.media-container .video,
.media-container .spotify {
  flex: 1 1 48%;
  display: block;
}

/* YouTube: 元の比率で表示（16:9）でなく、「元の動画の解像度そのまま」で表示 */
.media-container .video iframe {
  width: 100%;
  height: 315px; /* 元のYouTube標準埋め込みサイズ（可変にしてもOK） */
  border: none;
  display: block;
}

/* Spotify：高さは低めでOK */
.media-container .spotify iframe {
  width: 100%;
  height: 232px; /* Spotifyの推奨サイズ（高さ） */
  border-radius: 12px;
  border: none;
  transform: translateY(15px);
}