:root {
  color-scheme: dark;
  --background: #02071d;
  --panel: #07153b;
  --border: rgba(111, 225, 255, 0.22);
  --text: #f7fbff;
  --muted: #b7c4df;
  --cyan: #20e4ff;
  --blue: #3478ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 0%, rgba(25, 91, 255, 0.42), transparent 34rem),
    radial-gradient(circle at 90% 100%, rgba(118, 52, 255, 0.26), transparent 30rem),
    var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
  line-height: 1.6;
}

main {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 72px;
}

.brand {
  color: var(--cyan);
  font-size: 0.88rem;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 { font-size: clamp(2.25rem, 8vw, 4rem); line-height: 1.05; margin: 12px 0 18px; }
h2 { font-size: 1.25rem; margin: 0 0 8px; }
p { margin: 0 0 16px; }
a { color: var(--cyan); }

.lede { color: var(--muted); font-size: 1.12rem; max-width: 760px; }
.meta { color: var(--muted); font-size: 0.92rem; }
.compatibility { color: var(--muted); font-size: 0.92rem; margin-top: 18px; }

.card {
  background: linear-gradient(145deg, rgba(10, 35, 94, 0.94), rgba(4, 15, 47, 0.94));
  border: 1px solid var(--border);
  border-radius: 22px;
  margin-top: 20px;
  padding: 24px;
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.28);
}

.actions { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin-top: 28px; }
.action {
  display: block;
  padding: 18px;
  border-radius: 16px;
  background: rgba(52, 120, 255, 0.17);
  border: 1px solid rgba(52, 120, 255, 0.5);
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}
.action span { display: block; color: var(--muted); font-size: 0.88rem; font-weight: 500; margin-top: 4px; }
.action.primary { background: linear-gradient(135deg, var(--blue), #7145ff); border-color: rgba(255, 255, 255, 0.45); }
.action.primary span { color: rgba(255, 255, 255, 0.82); }
.steps { margin: 20px 0 0; padding-left: 22px; color: var(--muted); }
.steps li + li { margin-top: 12px; }
.steps strong { color: var(--text); }
.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.feature-grid .card { margin-top: 14px; }

footer { color: var(--muted); font-size: 0.84rem; margin-top: 36px; }
nav { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 32px; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a:focus { color: var(--cyan); }

@media (max-width: 520px) {
  main { padding-top: 32px; }
  .card { padding: 20px; border-radius: 18px; }
  .feature-grid { grid-template-columns: 1fr; }
}