:root {
  color-scheme: light dark;
  --ink: #162035;
  --muted: #56647a;
  --bg: #f4f7fc;
  --surface: rgba(255, 255, 255, .78);
  --line: rgba(27, 47, 79, .12);
  --accent: #475ce7;
  --accent-soft: #e8edff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at 85% 0%, #dfe6ff 0, transparent 36%),
              radial-gradient(circle at 0% 55%, #e5f5f7 0, transparent 38%), var(--bg);
}
a { color: var(--accent); }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
.shell { width: min(100% - 36px, 820px); margin: 0 auto; }
header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 28px 0; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); font-weight: 750; text-decoration: none; letter-spacing: -.03em; }
.mark { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 11px; color: #fff; background: linear-gradient(145deg, #7989ff, #3d4ed2); box-shadow: 0 5px 15px rgba(57, 75, 205, .24); }
nav { display: flex; gap: 20px; font-size: .94rem; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--accent); }
main { padding: 64px 0 90px; }
.eyebrow { color: var(--accent); font-size: .75rem; font-weight: 800; text-transform: uppercase; letter-spacing: .13em; }
h1, h2, h3 { line-height: 1.16; letter-spacing: -.045em; }
h1 { font-size: clamp(2.5rem, 7vw, 4.5rem); margin: 12px 0 20px; }
h2 { font-size: 1.35rem; margin: 0 0 12px; }
h3 { font-size: 1.08rem; margin: 0 0 8px; }
p { margin: 0 0 16px; }
.lead { color: var(--muted); font-size: 1.18rem; max-width: 640px; }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-top: 38px; }
.card, .paper { border: 1px solid var(--line); background: var(--surface); box-shadow: 0 16px 48px rgba(38, 55, 92, .07); backdrop-filter: blur(14px); }
.card { padding: 28px; border-radius: 23px; }
.card p { color: var(--muted); }
.button { display: inline-block; margin-top: 7px; border-radius: 12px; padding: 11px 17px; color: #fff; background: var(--accent); text-decoration: none; font-weight: 650; }
.button:hover { filter: brightness(1.08); }
.text-link { font-weight: 650; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.paper { padding: clamp(25px, 5vw, 52px); border-radius: 27px; margin-top: 38px; }
.paper section + section { border-top: 1px solid var(--line); padding-top: 27px; margin-top: 27px; }
.paper p, .paper li { color: var(--muted); }
.paper ul { padding-left: 23px; }
.updated { color: var(--muted); font-size: .9rem; }
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; padding: 25px 0 38px; display: flex; justify-content: space-between; gap: 16px; }
footer a { color: inherit; }
@media (max-width: 620px) {
  header, footer { align-items: flex-start; flex-direction: column; }
  main { padding-top: 38px; }
  .cards { grid-template-columns: 1fr; }
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #eff3ff; --muted: #b4bed4; --bg: #0d1425; --surface: rgba(26, 36, 59, .78); --line: rgba(199, 212, 247, .15); --accent: #a4b2ff; --accent-soft: #1f2b57; }
  body { background: radial-gradient(circle at 85% 0%, #1e2755 0, transparent 36%), radial-gradient(circle at 0% 55%, #103449 0, transparent 38%), var(--bg); }
  .button { color: #0b1430; }
}