:root {
  --bg: #f7f6f3; --card: #ffffff; --text: #1b1b1f; --muted: #5f5f66; --accent: #0a66d9; --line: #e5e3dd;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111114; --card: #1b1b20; --text: #f2f2f5; --muted: #a0a0aa; --accent: #6fa8ff; --line: #2a2a31; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background: var(--bg); color: var(--text); }
main { max-width: 720px; margin: 0 auto; padding: 48px 20px 80px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 36px; }
header .mark { width: 44px; height: 28px; border-radius: 6px; background: linear-gradient(135deg, #e8956a, #b05a63 60%, #4b3a7a); box-shadow: 0 4px 12px rgba(0,0,0,.18); }
header a { color: inherit; text-decoration: none; font-weight: 700; font-size: 20px; }
nav { margin-left: auto; display: flex; gap: 18px; }
nav a { font-weight: 500; font-size: 15px; color: var(--muted); }
nav a:hover { color: var(--accent); }
h1 { font-size: 34px; line-height: 1.2; margin: 0 0 8px; letter-spacing: -0.01em; }
h2 { font-size: 22px; margin: 36px 0 10px; }
p.lede { color: var(--muted); font-size: 19px; margin: 0 0 28px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 22px 24px; margin: 18px 0; }
ul { padding-left: 22px; } li { margin: 6px 0; }
a { color: var(--accent); }
.meta { color: var(--muted); font-size: 14px; }
footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; display: flex; flex-wrap: wrap; gap: 8px 18px; }
footer a { color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.grid .card { margin: 0; }
.grid h3 { margin: 0 0 6px; font-size: 17px; }
.grid p { margin: 0; color: var(--muted); font-size: 15px; }