:root {
  --bg: #ffffff;
  --text: #000000;
  --border: #cccccc;
  --link: #0066cc;
  --link-visited: #660066;
  --gray: #666666;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1a1a1a;
    --text: #e0e0e0;
    --border: #444444;
    --link: #66b3ff;
    --link-visited: #ff99ff;
    --gray: #999999;
  }
}

@media (prefers-color-scheme: light) {
  :root[data-theme="dark"] {
    --bg: #1a1a1a;
    --text: #e0e0e0;
    --border: #444444;
    --link: #66b3ff;
    --link-visited: #ff99ff;
    --gray: #999999;
  }
}
:root[data-theme="dark"] {
  --bg: #1a1a1a;
  --text: #e0e0e0;
  --border: #444444;
  --link: #66b3ff;
  --link-visited: #ff99ff;
  --gray: #999999;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  padding: 16px;
  max-width: 72ch;
  margin: 0 auto;
}

h1 { font-size: 1.5em; margin: 0.5em 0; }
h2 { font-size: 1.2em; margin: 0.8em 0 0.3em 0; }
section { border-bottom: 1px solid var(--border); padding: 1.5em 0; }
section:last-of-type { border-bottom: none; }
a { color: var(--link); text-decoration: none; }
a:visited { color: var(--link-visited); }
.meta { color: var(--gray); font-size: 0.9em; }
.source-item { margin: 0.3em 0; padding: 0.1em 0 0.1em 0.5em; border-left: 2px solid var(--border); }
.primary { margin: 0.5em 0; }
.lang-tag { font-size: 0.7em; font-weight: bold; border: 1px solid var(--border); border-radius: 3px; padding: 0 0.3em; vertical-align: middle; }
details { margin: 1em 0; }
summary { cursor: pointer; font-weight: bold; }
.footer { border-top: 2px solid var(--border); margin-top: 2em; padding-top: 1em; font-size: 0.9em; color: var(--gray); }
nav.days { display: flex; flex-wrap: wrap; gap: 0.4em 1.2em; font-size: 0.9em; padding: 0.3em 0; }
.embed { margin: 0.3em 0 0.4em 0; }
.embed summary { font-weight: normal; color: var(--link); }
.embed-body { padding: 0.4em 0; max-width: 100%; overflow-wrap: anywhere; }
.embed-body blockquote { margin: 0; padding: 0.4em 0.6em; border-left: 3px solid var(--border); }
.embed-yt { display: block; width: 100%; aspect-ratio: 16 / 9; height: auto; border: 0; }
.embed-card { border: 1px solid var(--border); border-radius: 6px; padding: 0.5em 0.7em; }
.archive ul { padding-left: 1.2em; }