* {

  box-sizing: border-box;

}

body {
  margin: 0;
  padding: 0;

  color: #111;
  font-size: 18px;
  font-family: system-ui, sans-serif;
}

main {

  max-width: 680px;

  margin: 0 auto;

  padding: 80px 24px;

  line-height: 2.4;

}

a {
  color: #111;
  text-decoration: none;
}

details {
  margin-bottom: 24px;
}

.site-header {
  font-family: "jimbo-std-expanded", sans-serif;

  font-size: 42px;
  text-align: center;

  margin-bottom: 100px;

  letter-spacing: 0.02em;
}

summary {
  list-style: none;
  cursor: pointer;

  font-size: 24px;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

summary::-webkit-details-marker {
  display: none;
}

details summary::before {
  content: "⌵";
  display: inline-block;
  margin-right: 10px;

  transition: transform 0.2s ease;
}

details[open] summary::before {
  transform: rotate(180deg);
}

details div {
  margin-bottom: 18px;
  padding-left: 28px;
  font-size: 20px;
}

.post-nav {
  margin-top: 40px;

  display: flex;
  justify-content: center;
  gap: 40px;

  font-size: 17px;
}

.post-nav a {
  color: #111;
  text-decoration: none;
}

.footer {
  clear: both;

  margin-top: 80px;

  text-align: center;
  font-family: serif;
  color: black;
  width: 100%;
  line-height: 1.6;
  padding-bottom: 38px;
}

.post-footer {
  margin-top: 40px !important;
}

.touch {
  font-size: 16px;
  margin-bottom: 6px;
}

.part {
  font-size: 14px;
  margin-bottom: 6px;
}

.links {
  font-size: 14px;
  margin-bottom: 6px;
}

.copyright {
  font-size: 13px;
}

/* 画像 */
img {
  width: 100%;
  height: auto;

  display: block;
  margin: 60px 0;
}

/* iPhone */
@media (max-width: 768px) {

  main {
    width: 100%;
    padding: 40px 20px;
  }

  .site-header {
    font-size: 24px;
    margin-bottom: 48px;
  }

  details {
    text-align: center;
  }

  summary {
  position: relative;

  width: 100%;
  max-width: 320px;

  margin: 0 auto;
  text-align: center;

  border-bottom: 1px solid #111;
  padding-bottom: 8px;  
}

details summary::before {

  content: "⌵";

  position: absolute;

  left: 0;

  transform: translateX(20px);

  transition: transform 0.2s ease;
}

details[open] summary::before {
  transform: translateX(20px) rotate(180deg);
}

 details div {
  padding-left: 0;
} 

  .touch {
  font-size: 14px;
}

.part {
  font-size: 12px;
}

.links {
  font-size: 12px;
  line-height: 2;
  word-break: break-word;
}

.copyright {
  font-size: 11px;
}
  .links {
    line-height: 2;
    word-break: break-word;
  }

  .footer {

  margin-top: 300px;

}

  .post-footer {

  margin-top: 60px !important;

}

  .post-nav {
    font-size: 17px !important;
  }
  
  img {
    width: 100%;
    height: auto;
  }

}