:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #e8f8ff;
  background: #061923;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% 0%, rgba(56, 189, 248, .2), transparent 30rem),
    radial-gradient(circle at 90% 35%, rgba(14, 165, 233, .1), transparent 28rem),
    linear-gradient(160deg, #071d29 0%, #04131b 100%);
}

.shell { width: min(880px, calc(100% - 32px)); margin: 0 auto; padding: 32px 0; }
.brand { display: inline-flex; align-items: center; gap: 12px; margin-bottom: 24px; font-weight: 750; font-size: 18px; }
.brand-mark { display: grid; place-items: center; min-width: 84px; height: 42px; padding: 0 12px; border-radius: 12px; background: #38bdf8; color: #04202c; font-size: 11px; font-weight: 900; letter-spacing: .08em; }
.card { background: rgba(12, 42, 56, .94); border: 1px solid rgba(125, 211, 252, .18); border-radius: 24px; padding: clamp(24px, 6vw, 54px); box-shadow: 0 24px 80px rgba(0, 0, 0, .35); }
.eyebrow { color: #7dd3fc; font-size: 12px; font-weight: 800; letter-spacing: .14em; }
h1 { margin: 10px 0 14px; font-size: clamp(38px, 7vw, 58px); line-height: 1.04; letter-spacing: -.04em; }
h2 { margin: 0 0 12px; font-size: 25px; letter-spacing: -.015em; }
h3 { margin: 24px 0 8px; font-size: 17px; }
p, li { line-height: 1.72; }
.lede { max-width: 700px; color: #b4cfda; font-size: 18px; margin-bottom: 8px; }
.updated { color: #86aab8; font-size: 13px; margin-bottom: 30px; }
section { padding-top: 34px; margin-top: 34px; border-top: 1px solid rgba(186, 230, 253, .14); scroll-margin-top: 20px; }
ul { padding-left: 23px; }
li + li { margin-top: 8px; }
a { color: #7dd3fc; text-underline-offset: 3px; }
a:hover { color: #bae6fd; }
a:focus-visible { outline: 3px solid #38bdf8; outline-offset: 3px; border-radius: 3px; }
.contents { border: 1px solid rgba(125, 211, 252, .22); background: rgba(22, 57, 74, .75); border-radius: 16px; padding: 19px 21px; }
.contents-links { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 10px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 20px 0; }
.feature, .provider { border: 1px solid rgba(186, 230, 253, .14); border-radius: 14px; padding: 18px; background: rgba(22, 57, 74, .55); }
.feature h3, .provider h3 { margin-top: 0; }
.feature p, .provider p { margin-bottom: 0; }
.provider + .provider { margin-top: 12px; }
footer { display: flex; justify-content: space-between; color: #86aab8; font-size: 13px; padding: 20px 4px; }

@media (max-width: 720px) {
  .feature-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .shell { width: min(100% - 20px, 880px); padding-top: 18px; }
  .card { border-radius: 18px; }
  .contents-links { flex-direction: column; gap: 8px; }
  footer { flex-direction: column; gap: 7px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}