:root { --brand: #1F5C45; --ink: #1c1c1e; --muted: #6e6e73; --paper: #f5f3ee; --card: #ffffff; }
@media (prefers-color-scheme: dark) { :root { --ink: #f2f2f7; --muted: #a1a1a6; --paper: #000; --card: #1c1c1e; --brand: #6ed9a3; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 20px 64px; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 28px; }
header .mark { width: 40px; height: 40px; border-radius: 12px; background: var(--brand); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 18px; }
header a { color: var(--ink); text-decoration: none; font-weight: 700; font-size: 20px; }
nav a { color: var(--brand); text-decoration: none; margin-right: 16px; font-weight: 600; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 6px; letter-spacing: -0.3px; }
h2 { font-size: 20px; margin: 30px 0 8px; }
p, li { color: var(--ink); }
.muted { color: var(--muted); }
.card { background: var(--card); border-radius: 18px; padding: 20px 22px; margin: 18px 0; }
a.button { display: inline-block; background: var(--brand); color: #fff; padding: 12px 18px; border-radius: 14px; text-decoration: none; font-weight: 600; }
footer { margin-top: 48px; color: var(--muted); font-size: 14px; }
ul { padding-left: 22px; }