:root {
  --bg: #f7f8f8; --fg: #14181b; --mut: #5d676f; --line: #dde2e5; --card: #fff;
  --link: #0a6e74; --gold: #b38f00;
  --hero1: #0f171c; --hero2: #0d2b2b; --hero3: #080d12; --herofg: #eef3f3;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0b1013; --fg: #e8eded; --mut: #9aa6ad; --line: #222b30; --card: #12191d;
          --link: #5fd0d3; --gold: #ffd60a; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif; }
a { color: var(--link); }
.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
       max-width: 860px; margin: 0 auto; padding: 14px 16px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--fg); text-decoration: none; }
.brand img { border-radius: 7px; }
nav { display: flex; gap: 16px; font-size: 15px; }
nav a { color: var(--mut); text-decoration: none; }
nav a[aria-current=page] { color: var(--fg); font-weight: 600; }
.hero { background: linear-gradient(160deg, var(--hero1), var(--hero2) 55%, var(--hero3));
        color: var(--herofg); text-align: center; padding: 56px 16px 64px; }
.hero img { border-radius: 22px; }
.hero h1 { font-size: clamp(28px, 6vw, 46px); line-height: 1.12; margin: 20px auto 6px; max-width: 720px; text-wrap: balance; }
.hero .sub { font-size: clamp(19px, 3.4vw, 24px); color: #ffd60a; margin: 0 0 16px; }
.hero .lead { max-width: 560px; margin: 0 auto 24px; color: #c4d1d1; }
.cta { display: inline-block; background: #ffd60a; color: #111; font-weight: 600; padding: 12px 22px;
       border-radius: 12px; text-decoration: none; }
.prose { max-width: 720px; margin: 0 auto; padding: 28px 16px 40px; }
.prose h1 { font-size: 32px; line-height: 1.2; margin: 8px 0 12px; }
.prose h2 { font-size: 21px; margin: 28px 0 6px; }
.prose p { margin: 0 0 12px; }
details { border-top: 1px solid var(--line); padding: 12px 0; }
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 8px 0 0; color: var(--mut); }
.mut { color: var(--mut); font-size: 14px; }
footer { max-width: 720px; margin: 0 auto; padding: 16px 16px 40px; border-top: 1px solid var(--line);
         color: var(--mut); font-size: 14px; }
footer p { margin: 4px 0; }