:root {
  --bg: #ffffff;
  --surface: #f4f3fa;
  --text: #15132b;
  --muted: #5d5a75;
  --line: #e3e1ef;
  --accent-a: #4c24a0;
  --accent-b: #ff6b61;
  --link: #5b2fd0;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0c1a;
    --surface: #18162b;
    --text: #f2f1fa;
    --muted: #a9a6c2;
    --line: #2a2742;
    --link: #b49cff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 0 16px; }
header.site {
  background: linear-gradient(135deg, #120f38 0%, var(--accent-a) 55%, var(--accent-b) 100%);
  color: #fff;
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; padding-top: 18px; padding-bottom: 18px; gap: 12px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 800; font-size: 20px; letter-spacing: -0.01em; }
.brand-mark { width: 30px; height: 30px; border-radius: 8px; background: rgba(255,255,255,.18); display: grid; place-items: center; }
.brand-mark span { display: block; height: 4px; border-radius: 2px; background: #fff; margin: 2px 0; }
nav.site a { color: rgba(255,255,255,.9); text-decoration: none; margin-left: 16px; font-size: 15px; font-weight: 600; }
nav.site a:first-child { margin-left: 0; }
nav.site a:hover { color: #fff; text-decoration: underline; }
.hero { padding: 56px 0 48px; }
.hero h1 { font-size: clamp(38px, 9vw, 60px); line-height: 1.05; margin: 0 0 14px; letter-spacing: -0.03em; font-weight: 900; }
.hero p { font-size: 19px; color: rgba(255,255,255,.88); margin: 0 0 26px; max-width: 34em; }
.badge { display: inline-flex; align-items: center; gap: 8px; background: #000; color: #fff; text-decoration: none; padding: 12px 20px; border-radius: 12px; font-weight: 700; border: 1px solid rgba(255,255,255,.35); }
main { padding: 36px 0 56px; }
h1.page { font-size: 36px; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 6px; }
.meta { color: var(--muted); font-size: 15px; margin: 0 0 28px; }
h2 { font-size: 22px; margin: 34px 0 8px; letter-spacing: -0.01em; }
h3 { font-size: 18px; margin: 22px 0 6px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--link); }
ul { padding-left: 22px; }
li { margin: 6px 0; }
.features { list-style: none; padding: 0; display: grid; gap: 12px; }
.features li { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 16px 18px; margin: 0; }
.features strong { display: block; font-size: 17px; }
.callout { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--accent-b); border-radius: 12px; padding: 14px 16px; margin: 18px 0; }
details { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 12px 16px; margin: 10px 0; }
summary { cursor: pointer; font-weight: 700; }
details p, details ul { margin: 10px 0 4px; }
footer.site { border-top: 1px solid var(--line); padding: 22px 0 36px; color: var(--muted); font-size: 14px; }
footer.site a { color: var(--muted); margin-right: 14px; }
@media (max-width: 480px) {
  nav.site a { margin-left: 12px; font-size: 14px; }
  h1.page { font-size: 30px; }
}