:root {
  --bg: #ffffff; --fg: #1c1c1e; --muted: #6e6e73; --line: #e5e5ea; --card: #f2f2f7; --accent: #007aff;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #000000; --fg: #f2f2f7; --muted: #98989d; --line: #38383a; --card: #1c1c1e; --accent: #0a84ff; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
nav { display: flex; gap: 20px; font-size: 15px; margin-bottom: 40px; flex-wrap: wrap; }
nav a:first-child { font-weight: 600; color: var(--fg); margin-right: auto; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 34px; line-height: 1.15; margin: 0 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 22px; margin: 40px 0 8px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 24px 0 4px; }
p, li { color: var(--fg); }
.lede { font-size: 20px; color: var(--muted); margin: 0 0 32px; }
.muted { color: var(--muted); }
.card { background: var(--card); border-radius: 14px; padding: 16px 20px; margin: 16px 0; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
.table { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 15px; margin: 12px 0; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--line); }
th { font-weight: 600; }
footer { margin-top: 56px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }
footer p { color: var(--muted); margin: 4px 0; }
.heart { color: #ff3b30; }