:root { --ink: #1a1a14; --body: #4a4b52; --mute: #6f6f66; --canvas: #ffffff; --page: #f1f0e9; --primary: #9fe870; --on-primary: #163300; --radius: 24px; }
@media (prefers-color-scheme: dark) { :root { --ink: #f1f0e9; --body: #adaca2; --mute: #8b8b80; --canvas: #1c1c18; --page: #101009; } }
* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, -apple-system, system-ui, "Segoe UI", Roboto, sans-serif; background: var(--page); color: var(--ink); line-height: 1.5; }
main { max-width: 560px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-family: Archivo, Inter, system-ui, sans-serif; font-weight: 900; font-size: 34px; line-height: 1.1; margin: 24px 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--body); }
.mark { width: 64px; height: 64px; border-radius: 20px; background: var(--primary); color: var(--on-primary); display: grid; place-items: center; font-family: Archivo, system-ui, sans-serif; font-weight: 900; font-size: 32px; }
.card { background: var(--canvas); border-radius: var(--radius); padding: 24px; margin: 24px 0; }
.code { font-family: Archivo, system-ui, sans-serif; font-weight: 900; font-size: 40px; letter-spacing: 6px; margin: 8px 0 16px; }
.button { display: inline-block; background: var(--primary); color: var(--on-primary); text-decoration: none; font-weight: 600; padding: 14px 24px; border-radius: 999px; }
.button.secondary { background: transparent; color: var(--ink); border: 1px solid var(--ink); }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.muted { color: var(--mute); font-size: 14px; }
footer { margin-top: 48px; font-size: 14px; color: var(--mute); }
footer a { color: inherit; }