:root { --ink: #121417; --accent: #CF3A22; --muted: #5d6470; --bg: #fafaf8; --card: #fff; --text: #1a1d22; }
@media (prefers-color-scheme: dark) { :root { --bg: #0e0f12; --card: #1a1d22; --text: #ececec; --muted: #a3a9b3; } }
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; line-height: 1.6; color: var(--text); background: var(--bg); }
header { background: var(--ink); color: #fff; padding: 2.5rem 1.5rem; }
header .wrap, main { max-width: 680px; margin: 0 auto; }
header h1 { margin: .5rem 0 0; font-size: 2rem; }
header p { margin: .5rem 0 0; color: #c9ced6; }
.mark { display: inline-block; width: 48px; height: 48px; border-radius: 14px; background: var(--accent); }
main { padding: 2rem 1.5rem 4rem; }
h2 { margin-top: 2rem; font-size: 1.2rem; }
a { color: var(--accent); }
.btn { display: inline-block; padding: .8rem 1.2rem; border-radius: 12px; background: var(--accent); color: #fff; text-decoration: none; font-weight: 700; }
footer { max-width: 680px; margin: 0 auto; padding: 1rem 1.5rem 3rem; color: var(--muted); font-size: .9rem; }
footer a { color: var(--muted); margin-right: 1rem; }
code { background: rgba(127,127,127,.15); padding: .1rem .35rem; border-radius: 6px; }