body {
  background-color: #f8f9fa;
  color: #333;
  font-family: sans-serif;
  padding: 40px;
}

a {
  color: #25bace;
  text-decoration: none;
}

a:hover {
  color: #1995a8;
  text-decoration: underline;
}

header {
  color: #25bace;
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: #f8f9fa;
  border-bottom: 1px solid #eeeeee;
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

header h1 {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  line-height: 1;
}

main {
  display: flex;
  gap: 20px;
  font-size: small;
}

main h4 {
  margin-bottom: 7px;
}
main p {
  margin-top: 0;
  padding-left: 1em;
}

footer {
  position: sticky;
  top: 100vh;
  text-align: center;
}

.subtitle {
  font-size: 0.85rem;
  font-weight: normal;
  color: #666666;
}


/* nav menu */
nav ul {
  display: flex;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}


/* deon only color setting */
.deon a {
  color: #ce2525;
  text-decoration: none;
}
.deon a:hover {
  color: #941b1b;
  text-decoration: underline;
}
.deon header {
  color: #ce2525;
}

/* left side*/
aside {
  margin-top: 30px;
  width: 300px;
  flex-shrink: 0;
  position: sticky;
  top: 70px;
  align-self: flex-start;
}

aside ul {
  list-style-type: square;
}


/* right side*/
.details {
  margin-top: 30px;
  max-width: 600px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 60px; /* 曲と曲の間のすき間 */
}

.details section {
  background-color: #ededed;
  padding: 24px;
  scroll-margin-top: 100px;
}

.details p:not(.lyric) {
  font-size: smaller;
  color: #666666;
  margin-bottom: 12px;
}

.details .lyric {
  font-size: small;
}

.column {
  flex: 1;
  padding: 20px;
}