:root {
  --fg: #111;
  --bg: #fff;
  --muted: #555;
  --subtle: #666;
  --rule: #ccc;
  --quote: #333;
  --quote-rule: #999;
  --link: #00008B;
  color-scheme: light;
}

[data-theme="dark"] {
  --fg: #e6e6e6;
  --bg: #0F0F0F;
  --muted: #aaa;
  --subtle: #999;
  --rule: #333;
  --quote: #ddd;
  --quote-rule: #555;
  --link: #8ab4f8;
  color-scheme: dark;
}

body {
  font-family: Georgia, "Times New Roman", serif;
  max-width: 700px;
  margin: 60px auto;
  padding: 0 20px;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
  font-size: 17px;
  -webkit-text-size-adjust: 100%;
}

h1 {
  font-size: 26px;
  font-weight: normal;
  margin: 0 0 4px;
}

h2 {
  font-size: 20px;
  font-weight: normal;
  margin-bottom: 4px;
}

.subtitle {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 30px;
}

hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 30px 0;
}

blockquote {
  margin: 0;
  padding-left: 15px;
  border-left: 2px solid var(--quote-rule);
  color: var(--quote);
  font-style: italic;
}

blockquote p {
  margin: 0;
}

.cite {
  display: block;
  margin-top: 8px;
  font-style: normal;
  font-size: 14px;
  color: var(--subtle);
}

a {
  color: var(--link);
  text-underline-offset: 2px;
}

a:hover {
  text-decoration-thickness: 2px;
}

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

ul {
  padding-left: 18px;
}

li {
  margin-bottom: 4px;
}

/* top navigation */
.site-nav {
  font-size: 15px;
  color: var(--subtle);
  margin-bottom: 40px;
}

.site-nav a {
  text-decoration: none;
}

.site-nav a:hover {
  text-decoration: underline;
}

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

.site-nav .sep {
  margin: 0 6px;
}

#theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  font-size: 18px;
  line-height: 1;
  padding: 6px;
  cursor: pointer;
  color: var(--fg);
}

section {
  margin-bottom: 10px;
}

.project-date {
  color: var(--subtle);
  font-size: 14px;
  margin: 0 0 10px;
}

.fingerprint {
  display: block;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 13px;
  color: var(--subtle);
  word-break: break-all;
}

footer {
  margin-top: 50px;
  font-size: 14px;
  color: var(--subtle);
}

@media (max-width: 600px) {
  body {
    margin: 40px auto;
    font-size: 16px;
  }

  #theme-toggle {
    top: 10px;
    right: 10px;
  }
}

@media print {
  #theme-toggle,
  .site-nav {
    display: none;
  }

  body {
    margin: 0;
    max-width: none;
    color: #000;
    background: #fff;
  }
}