:root {
  color-scheme: dark;
  --background: #020817;
  --surface: rgba(16, 37, 75, 0.82);
  --border: rgba(127, 212, 255, 0.3);
  --text: #eef8ff;
  --muted: #9fc4da;
  --accent: #70cfff;
  --accent-dark: #05213d;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  padding: 32px 18px;
  display: grid;
  place-items: center;
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 20% 10%, rgba(64, 137, 188, 0.45), transparent 36%),
    radial-gradient(circle at 85% 20%, rgba(32, 75, 170, 0.38), transparent 42%),
    linear-gradient(160deg, #061630, var(--background) 70%);
}

.card {
  width: min(760px, 100%);
  padding: clamp(28px, 7vw, 68px);
  border: 1px solid var(--border);
  border-radius: 32px;
  background: var(--surface);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(18px);
}

.document { padding-top: 36px; }
.eyebrow { margin: 0; color: var(--accent); letter-spacing: .35em; font-size: 13px; font-weight: 700; }
h1 { margin: 8px 0 18px; font-size: clamp(42px, 9vw, 72px); line-height: 1; }
h2 { margin-bottom: 6px; font-size: 22px; }
p { color: var(--muted); }
.lead { max-width: 620px; font-size: 21px; }
.note { font-size: 14px; }
section { margin-top: 34px; }
nav { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0; }

a { color: var(--accent); }
.back { display: inline-block; margin-bottom: 30px; text-decoration: none; }
.button {
  display: inline-block;
  padding: 12px 19px;
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text);
  text-decoration: none;
}
.button.primary { color: var(--accent-dark); background: var(--accent); border-color: var(--accent); font-weight: 750; }
.button:hover, .button:focus-visible { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(112, 207, 255, 0.22); }
footer { margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--border); }

@media (prefers-reduced-motion: no-preference) {
  .button { transition: transform .2s ease, box-shadow .2s ease; }
}