:root {
  --bg: #fbfbf9;
  --fg: #1d1d1f;
  --muted: #6b6b70;
  --link: #2563eb;
  --border: #e6e6e1;
  --code-bg: #f1f1ec;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16161a;
    --fg: #e8e8ea;
    --muted: #9a9aa2;
    --link: #7aa2ff;
    --border: #2a2a30;
    --code-bg: #23232a;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 4rem 1.4rem 6rem;
}

header h1 { font-size: 2rem; margin: 0 0 2rem; letter-spacing: -0.02em; }

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.home {
  display: inline-block;
  margin-bottom: 2.5rem;
  font-size: 0.92rem;
  color: var(--muted);
}
.home:hover { color: var(--link); }

/* index list */
ul.notes { list-style: none; padding: 0; margin: 0; }
ul.notes li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}
ul.notes li a { font-size: 1.08rem; }
ul.notes .date { color: var(--muted); font-size: 0.85rem; white-space: nowrap; }

.empty { color: var(--muted); }

/* article */
article .date { color: var(--muted); font-size: 0.85rem; margin: 0 0 1.5rem; }
article h1 { font-size: 1.9rem; letter-spacing: -0.02em; margin: 0 0 1rem; }
article h2 { font-size: 1.4rem; margin: 2.5rem 0 0.8rem; }
article h3 { font-size: 1.15rem; margin: 2rem 0 0.6rem; }

p, ul, ol, blockquote, pre, table { margin: 0 0 1.2rem; }

blockquote {
  border-left: 3px solid var(--border);
  margin-left: 0;
  padding-left: 1rem;
  color: var(--muted);
}

code {
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
pre {
  background: var(--code-bg);
  padding: 1rem 1.2rem;
  border-radius: 8px;
  overflow-x: auto;
}
pre code { background: none; padding: 0; font-size: 0.85em; }

img { max-width: 100%; height: auto; border-radius: 8px; }

hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

table { border-collapse: collapse; width: 100%; }
th, td { border: 1px solid var(--border); padding: 0.5rem 0.75rem; text-align: left; }