:root {
  color-scheme: light dark;
  --ink: #10213f;
  --muted: #54637a;
  --paper: #f7f9fc;
  --surface: #ffffff;
  --blue: #1267d6;
  --lime: #9fe31a;
  --coral: #ff6b5c;
  --line: #dce3ed;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a { color: var(--blue); }

header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.nav, main, footer {
  width: min(760px, calc(100% - 40px));
  margin: 0 auto;
}

.nav {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
}

.brand img { width: 44px; height: 44px; border-radius: 10px; }
.nav nav { display: flex; gap: 18px; }
.nav nav a { color: var(--muted); text-decoration: none; }

main { padding: 64px 0 72px; }

.eyebrow {
  color: var(--blue);
  font-size: 0.82rem;
  font-weight: 750;
  text-transform: uppercase;
}

h1 { margin: 8px 0 16px; font-size: clamp(2.2rem, 8vw, 4.2rem); line-height: 1.05; }
h2 { margin-top: 38px; font-size: 1.35rem; }
p, li { color: var(--muted); }
.lead { max-width: 640px; font-size: 1.16rem; }

.actions { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 9px 16px;
  border: 1px solid var(--blue);
  border-radius: 6px;
  background: var(--blue);
  color: white;
  font-weight: 650;
  text-decoration: none;
}
.button.secondary { background: transparent; color: var(--blue); }

.feature-list {
  margin: 48px 0 0;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-list strong { display: block; margin-bottom: 5px; }
.feature-list span { color: var(--muted); }

.notice {
  margin: 28px 0;
  padding: 16px 18px;
  border-left: 4px solid var(--lime);
  background: var(--surface);
}

footer { padding: 28px 0 44px; border-top: 1px solid var(--line); color: var(--muted); }

@media (max-width: 620px) {
  .nav { align-items: flex-start; padding: 15px 0; flex-direction: column; }
  .nav nav { padding-bottom: 4px; }
  main { padding-top: 44px; }
  .feature-list { grid-template-columns: 1fr; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f4f7fc;
    --muted: #b2bfd1;
    --paper: #0e1624;
    --surface: #151f30;
    --blue: #65a5ff;
    --line: #2d3a4f;
  }
}