* {
  font-family: monospace;
  font-size: 1.025em;
  letter-spacing: -0.6px;
}

body {
  max-width: 650px;
  min-height: 100vh;
  margin: 0 auto;

  display: flex;
  align-items: center;
  overflow: hidden;
}
p {
  margin: 0;
  padding: 0;
}

header {
  padding: 8px;
}

footer {
  display: flex;
  justify-content: center;
  align-items: center;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  padding: 0;
  font-size: 1.5rem;
}

main {
  padding: 4px;
}

a,
a:visited,
a:hover,
a:active,
a:focus {
  color: blue;
  text-decoration: none;
}

ul {
  width: 100%;
  margin: 0;
  padding: 0.5rem 0;

  display: flex;
  align-items: flex-start;
  gap: 0.4rem;

  overflow-x: auto;

  list-style: none;
  box-sizing: border-box;

  scrollbar-width: none;
}

ul::-webkit-scrollbar {
  display: none;
}

li {
  flex: 0 0 auto;

  width: fit-content;
  max-width: 300px;
  padding: 0.2rem 0.5rem;

  border: 1px solid #000;
  border-radius: 8px;

  overflow-wrap: break-word;
}

li details {
  max-width: 100%;
}

li details p {
  overflow-wrap: break-word;
}

li details summary {
  text-align: center;
}

.header-list {
  margin: 0;
  padding: 0;
}

header ul {
  display: block;
}

header ul li {
  padding: 0;
  border: none;
}

/* phone layout */
@media (max-width: 740px) {
  body {
    min-height: 100vh;
    margin: auto;
    /* padding: 1.5rem; */
    padding: 0;
    width: fit-content;
    width: calc(100% - 10rem);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    border-radius: 12px;
    box-sizing: border-box;
    font-size: 1.125rem;
  }

  header {
    width: 100%;
    display: block;
    margin: 0;
    padding: 0;
  }

  header ul {
    overflow-x: visible;
  }

  header ul li {
    display: block;
  }

  main {
    margin-top: 1rem;
  }
}