:root {
  --font-jp: "BIZ UDPGothic", "MS PGothic", "ＭＳ Ｐゴシック",
             "Noto Sans JP", sans-serif;

  --paper: #f3eddf;
  --ink: #16130f;
  --vermilion: #8b2f25;
  --muted: #726858;
  --rule: #8d816e;
}

body {
  margin: 0;
  font-family: var(--font-jp);
  font-size: 16px;
  line-height: 1.9;
  letter-spacing: 0.04em;

  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  min-height: 100vh;

  background-color: var(--paper);
  background-image: radial-gradient(
    rgba(22, 19, 15, 0.035) 0.7px,
    transparent 0.7px
  );
  background-size: 4px 4px;

  color: var(--ink);
}

aside {
  padding: 32px 20px;
  border-right: 1px solid var(--rule);
}

aside h1 {
  margin: 0 0 36px 0;
  font-size: 1.1rem;
  font-weight: normal;
  letter-spacing: 0.18em;
}

nav a {
  display: block;
  margin-bottom: 10px;
  line-height: 1.5;
  text-decoration: none;
}

nav a.active {
  color: var(--ink);
  border-left: 3px solid var(--vermilion);
  padding-left: 8px;
}

a {
  color: var(--vermilion);
}

a:hover {
  text-decoration: underline;
}

main {
  padding: 32px 48px;
  width: 100%;
  max-width: none;
  box-sizing: border-box;
}

h1,
h2,
h3 {
  font-weight: normal;
  letter-spacing: 0.06em;
  margin-top: 1.5em;
  margin-bottom: 0.65em;
}

main h1 {
  font-size: 1.5rem;
  border-left: 4px solid var(--vermilion);
  padding-left: 12px;
}

h2 {
  font-size: 1rem;
  padding-bottom: 5px;
  border-bottom: 3px double var(--rule);
  margin-top: 2.2em;
}

h3 {
  font-size: 1rem;
}

p,
li {
  font-size: 1rem;
}

.breadcrumbs {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 24px;
  letter-spacing: 0.05em;
}

ul,
ol {
  padding-left: 1.4em;
}

li {
  margin-bottom: 0.35em;
}

ul {
  list-style-type: square;
}


li::marker {
  color: var(--vermilion);
}

main a {
  text-decoration: none;
  border-bottom: 1px solid rgba(139, 47, 37, 0.35);
}

main a:hover {
  border-bottom-color: var(--vermilion);
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2em 0;
}

.meta {
  font-size: 0.875rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.raw-note {
  margin: 0;
  width: 100%;
  max-width: none;
  font: inherit;
  line-height: inherit;
  white-space: pre-wrap;
  overflow-wrap: normal;
  word-break: normal;
}

.note-footer {
  margin-top: 4em;
  padding-top: 1em;
  border-top: 1px solid var(--rule);
}

.site-footer {
  margin-top: 4em;
  padding-bottom: 2em;
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}

@media (max-width: 700px) {
  body {
    display: block;
  }

  aside {
    border-right: 0;
    border-bottom: 1px solid var(--rule);
    padding: 20px;
  }

  aside h1 {
    margin-bottom: 18px;
  }

  nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
  }

  nav a {
    margin-bottom: 0;
  }

  nav a.active {
    border-left: 0;
    border-bottom: 2px solid var(--vermilion);
    padding-left: 0;
  }

  main {
    padding: 24px 20px;
    max-width: none;
  }

  .breadcrumbs {
    font-size: 0.875rem;
    margin-bottom: 22px;
  }
}

::selection {
  background: rgba(139, 47, 37, 0.18);
  color: var(--ink);
}