:root {
  color-scheme: light dark;
  --paper: #faf7f2;
  --ink: #2b2723;
  --muted: #6f675e;
  --line: #e2dbd0;
  --accent: #a4472c;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1f1c19;
    --ink: #ece6dc;
    --muted: #a89f93;
    --line: #3a352f;
    --accent: #e8957a;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.9;
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

img {
  max-width: 100%;
  height: auto;
}

.site-header,
main,
.site-footer {
  width: min(100% - 2.5rem, 40rem);
  margin-inline: auto;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.25rem 1.5rem;
  padding-block: 1.5rem 1rem;
  border-bottom: 1px solid var(--line);
}

.site-name {
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.site-header nav {
  display: flex;
  gap: 1.25rem;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-header nav a:hover,
.site-header nav a[aria-current="page"] {
  color: var(--accent);
}

.site-header nav a[aria-current="page"] {
  font-weight: 700;
}

main {
  padding-block: 2.5rem 4rem;
}

h1,
h2,
h3 {
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", serif;
  line-height: 1.4;
}

h1 {
  margin: 0 0 1.5rem;
  font-size: 2rem;
}

h2 {
  margin: 2.5rem 0 0.75rem;
  font-size: 1.375rem;
}

h3 {
  margin: 2rem 0 0.5rem;
  font-size: 1.125rem;
}

p {
  margin: 0 0 1.25rem;
}

.diary-list {
  margin: 0 0 1.25rem;
  padding: 0;
  list-style: none;
}

.diary-list li {
  border-bottom: 1px solid var(--line);
}

.diary-list a {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.25rem;
  padding-block: 0.75rem;
  color: var(--ink);
  text-decoration: none;
}

.diary-list a:hover span {
  color: var(--accent);
}

.diary-list time,
.entry-date {
  color: var(--muted);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

.diary-list time {
  flex: 0 0 8.5rem;
  align-self: center;
}

.entry-date {
  margin-bottom: 0.25rem;
}

.back-link {
  margin-top: 3rem;
}

.site-footer {
  padding-block: 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.875rem;
}