:root { --bg: #f7f7f5; --fg: #1d1d1f; --muted: #6e6e73; --accent: #0a7c6b; --card: #ffffff; }
@media (prefers-color-scheme: dark) { :root { --bg: #111113; --fg: #f2f2f2; --muted: #a1a1a6; --accent: #34c3ac; --card: #1c1c1e; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif; }
main { max-width: 440px; margin: 0 auto; padding: 48px 16px 32px; }
h1 { font-size: 28px; margin: 0 0 8px; }
h2 { font-size: 17px; margin: 0 0 4px; }
.lead { color: var(--muted); margin: 0 0 24px; }
.button { display: block; text-align: center; padding: 14px 16px; border-radius: 12px; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600; }
.hint { margin: 12px 0 0; padding: 10px 12px; border-radius: 10px; background: var(--card); }
section { margin: 28px 0 0; padding: 16px; border-radius: 12px; background: var(--card); }
section p { margin: 0; color: var(--muted); }
.foot { margin: 24px 0 0; font-size: 14px; color: var(--muted); }