:root {
  --text: #1f2328;
  --muted: #59636e;
  --line: #d1d9e0;
  --accent: #1a5fb4;
  --bg: #ffffff;
  --soft: #f6f8fa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }

header { display: flex; align-items: center; justify-content: space-between; padding-top: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
header a.brand { font-weight: 700; color: var(--text); text-decoration: none; }
header nav a { margin-left: 16px; color: var(--muted); text-decoration: none; font-size: 15px; }

main { padding-top: 28px; padding-bottom: 40px; }
h1 { font-size: 32px; line-height: 1.25; margin: 8px 0 12px; }
h2 { font-size: 22px; margin: 32px 0 8px; }
h3 { font-size: 18px; margin: 20px 0 6px; }
p.lead { font-size: 19px; color: var(--muted); }
a { color: var(--accent); }

.cta { display: inline-block; margin: 12px 12px 0 0; padding: 10px 18px; border-radius: 6px; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600; }
.cta.secondary { background: var(--soft); color: var(--text); border: 1px solid var(--line); }

.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 12px; }
.plan { border: 1px solid var(--line); border-radius: 8px; padding: 16px 18px; }
.plan h3 { margin-top: 0; }
.plan .price { font-size: 22px; font-weight: 700; }
.plan ul { padding-left: 20px; margin: 8px 0 0; }

.note { background: var(--soft); border: 1px solid var(--line); border-radius: 8px; padding: 12px 16px; }

footer { padding-top: 16px; padding-bottom: 32px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); margin-right: 14px; }

@media (max-width: 600px) {
  .plans { grid-template-columns: 1fr; }
  h1 { font-size: 27px; }
}