:root { --bg: #fafafa; --fg: #16161a; --muted: #5a5a64; --line: #e3e3e8; --accent: #2f5bea; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e0e10; --fg: #f2f2f4; --muted: #a0a0aa; --line: #2a2a30; --accent: #8aa6ff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 16px; }
header { display: flex; justify-content: space-between; align-items: center; padding-top: 20px; padding-bottom: 20px;
         border-bottom: 1px solid var(--line); }
header a.brand { font-weight: 700; text-decoration: none; letter-spacing: -.01em; }
nav a { margin-left: 14px; font-size: .9rem; color: var(--muted); }
main { padding-top: 24px; padding-bottom: 40px; }
h1 { font-size: 1.9rem; line-height: 1.2; letter-spacing: -.02em; margin: .5rem 0; }
h2 { font-size: 1.2rem; margin: 2rem 0 .5rem; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
.lead { font-size: 1.1rem; color: var(--muted); }
.box { border: 1px solid var(--line); border-radius: 12px; padding: 4px 18px; margin: 1.2rem 0; }
table { border-collapse: collapse; width: 100%; font-size: .95rem; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px 8px 0; border-bottom: 1px solid var(--line); }
a { color: var(--accent); }
footer { padding-top: 16px; padding-bottom: 32px; border-top: 1px solid var(--line); font-size: .875rem; color: var(--muted); }
footer a { color: inherit; margin-right: 14px; }
@media (max-width: 480px) { nav a { margin-left: 10px; } h1 { font-size: 1.6rem; } table, thead, tbody, tr, th, td { display: block; } th { padding-bottom: 0; border: 0; } }
.step { border: 1px solid var(--line); border-radius: 12px; padding: 4px 18px 18px; margin: 1rem 0; }
.step h2 { display: flex; align-items: center; gap: 10px; margin: .9rem 0 .25rem; }
.step p { margin: .25rem 0 .9rem; color: var(--muted); }
.num { flex: none; width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center;
       background: var(--accent); color: var(--bg); font-size: .9rem; font-weight: 700; }
.button { display: block; text-align: center; padding: 12px 16px; border-radius: 10px; background: var(--accent);
          color: var(--bg); font-weight: 600; text-decoration: none; }