:root {
  --bg: #f7f8fa;
  --fg: #17202a;
  --muted: #5b6773;
  --line: #dfe4ea;
  --accent: #1f6feb;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; max-width: 1040px; margin: 0 auto; padding: 22px 24px;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); font-weight: 700; letter-spacing: .02em; }
.brand-mark {
  display: inline-grid; place-items: center; width: 30px; height: 30px;
  border-radius: 8px; background: var(--fg); color: #fff; font-size: 15px;
}
nav { display: flex; flex-wrap: wrap; gap: 20px; }
nav a { color: var(--muted); font-size: 15px; }
nav a:hover { color: var(--fg); text-decoration: none; }
main { max-width: 1040px; margin: 0 auto; padding: 0 24px; }
.hero { padding: 84px 0 64px; max-width: 760px; }
.eyebrow { margin: 0 0 14px; color: var(--accent); font-weight: 600; font-size: 14px; letter-spacing: .08em; text-transform: uppercase; }
h1 { margin: 0 0 20px; font-size: clamp(34px, 5vw, 56px); line-height: 1.08; letter-spacing: -.02em; }
.lead { margin: 0 0 30px; color: var(--muted); font-size: 19px; max-width: 620px; }
.button {
  display: inline-block; padding: 13px 22px; border-radius: 8px;
  background: var(--fg); color: #fff; font-weight: 600;
}
.button:hover { background: #2b3947; text-decoration: none; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; padding-bottom: 28px; }
.grid article { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 26px; }
.grid h2 { margin: 0 0 10px; font-size: 19px; }
.grid p { margin: 0; color: var(--muted); }
.note { border-top: 1px solid var(--line); margin-top: 24px; padding: 44px 0 64px; max-width: 720px; }
.note h2 { margin: 0 0 12px; font-size: 24px; }
.note p { margin: 0; color: var(--muted); }
.page { padding: 64px 0 80px; max-width: 760px; }
.page h1 { font-size: clamp(30px, 4vw, 44px); }
.page h2 { margin-top: 34px; font-size: 22px; }
.page p, .page li { color: var(--muted); }
.page ul { padding-left: 22px; }
.site-footer {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px;
  max-width: 1040px; margin: 0 auto; padding: 26px 24px 40px;
  border-top: 1px solid var(--line); color: var(--muted); font-size: 14px;
}
.site-footer p { margin: 0; }
@media (max-width: 640px) {
  .site-header { flex-direction: column; align-items: flex-start; }
  .hero { padding-top: 56px; }
}