:root { --bg: #fbfbfd; --text: #1d1d1f; --muted: #6e6e73; --line: #e5e5ea; --card: #ffffff; --link: #0066cc; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #000; --text: #f5f5f7; --muted: #a1a1a6; --line: #2c2c2e; --card: #1c1c1e; --link: #2997ff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 48px 20px 64px; }
header { margin-bottom: 32px; }
.app { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 15px; }
.app img { width: 40px; height: 40px; border-radius: 9px; }
h1 { font-size: 34px; line-height: 1.2; margin: 16px 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 21px; margin: 36px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 15px; }
section.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 4px 22px 18px; margin-top: 20px; }
a { color: var(--link); text-decoration: none; } a:hover { text-decoration: underline; }
nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 15px; margin-top: 12px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0 24px; }
details { border-top: 1px solid var(--line); padding: 12px 0; }
details:first-of-type { border-top: 0; }
summary { cursor: pointer; font-weight: 600; }
footer { margin-top: 48px; color: var(--muted); font-size: 13px; }