:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #5f5f5f;
  --line: #e6e6e6;
  --card: #f6f6f6;
  --accent: #111111;
  --todo-bg: #fff3b0;
  --todo-text: #5c4600;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --text: #f2f2f2;
    --muted: #a0a0a0;
    --line: #262626;
    --card: #141414;
    --accent: #ffffff;
    --todo-bg: #4a3b00;
    --todo-text: #ffe680;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}
header {
  border-bottom: 1px solid var(--line);
}
.bar {
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  font-weight: 700;
  font-size: 19px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.2px;
}
nav { display: flex; gap: 16px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 6px; letter-spacing: -0.5px; }
h2 { font-size: 21px; margin: 36px 0 8px; letter-spacing: -0.2px; }
h3 { font-size: 17px; margin: 24px 0 6px; }
p, li { color: var(--text); }
.updated { color: var(--muted); margin: 0 0 24px; font-size: 14px; }
.lead { font-size: 17px; color: var(--muted); }
a { color: var(--accent); }
ul { padding-left: 22px; }
li { margin: 4px 0; }
.box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 18px 0;
}
table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 12px 0; }
th, td { text-align: left; vertical-align: top; padding: 10px 8px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: 13px; }
.todo {
  background: var(--todo-bg);
  color: var(--todo-text);
  border-radius: 4px;
  padding: 0 4px;
  font-weight: 600;
}
footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
footer .bar { flex-wrap: wrap; }
footer a { color: var(--muted); }
@media (max-width: 520px) {
  h1 { font-size: 27px; }
  .bar { flex-direction: column; align-items: flex-start; gap: 8px; }
}
.box > :first-child { margin-top: 0; }
.box > :last-child { margin-bottom: 0; }