:root { --gold: #F5B800; --text: #1c1c1e; --muted: #6e6e73; --bg: #ffffff; --card: #f2f2f7; }
@media (prefers-color-scheme: dark) { :root { --text: #f2f2f7; --muted: #a1a1a6; --bg: #121212; --card: #1f1f22; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
       font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
.mark { width: 44px; height: 50px; background: var(--gold); clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
        display: grid; place-items: center; font-weight: 700; color: #000; margin-bottom: 16px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
.sub { color: var(--muted); margin: 0 0 24px; }
a { color: inherit; text-decoration-color: var(--gold); text-decoration-thickness: 2px; text-underline-offset: 3px; }
.card { background: var(--card); border-radius: 14px; padding: 4px 20px; }
ul { padding-left: 20px; }
footer { color: var(--muted); font-size: 14px; margin-top: 48px; }