/* Apple-like minimal light theme */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: #111827;
  background: #f7f8fb;
  font-size: 17px;
  line-height: 1.65;
}

.shell { max-width: 980px; padding: 0 22px; margin: 0 auto; }

.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: saturate(180%) blur(20px);
  background: rgba(255,255,255,0.8);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.site-header .shell { display: flex; align-items: center; justify-content: center; height: 72px; }
.brand-link { display: flex; gap: 12px; align-items: center; text-decoration: none; color: inherit; }
.logo { height: 48px; display: block; }
.nav a { color: #333; text-decoration: none; margin-left: 18px; font-weight: 600; font-size: 14px; }
.nav a:hover { color: #000; }

.content-narrow { padding: 72px 0 96px; max-width: 760px; }
h1 { font-size: 36px; line-height: 1.15; margin: 0 0 12px; font-weight: 700; }
h2 { font-size: 26px; margin: 36px 0 12px; font-weight: 600; }
p { margin: 0 0 18px; }
.muted { color: #6e6e73; }
.bullets { margin: 16px 0 28px; padding-left: 22px; color: #1f2933; line-height: 1.75; }
.bullets li + li { margin-top: 10px; }

.site-footer { border-top: 1px solid rgba(0,0,0,0.06); padding: 22px 0; background: #fafafa; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 8px; align-items: center; justify-items: center; text-align: center; }
.footer-nav a { color: #4a4a4a; text-decoration: none; margin-left: 16px; }
.footer-nav a:hover { color: #111; }

main.shell.content-narrow {
  background: #ffffff;
  border-radius: 24px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 24px 48px -32px rgba(15, 23, 42, 0.35);
  padding: 64px 48px 80px;
  margin-top: 64px;
  margin-bottom: 96px;
}

.content-narrow h1 {
  text-align: center;
  font-size: 34px;
  letter-spacing: -0.01em;
}

.content-narrow .muted {
  font-size: 15px;
  text-align: center;
  margin-bottom: 32px;
}

.content-narrow h2 {
  font-size: 24px;
  color: #0f172a;
}

.content-narrow p,
.content-narrow li {
  font-size: 17px;
  color: #1f2937;
}

.content-narrow h2 + p,
.content-narrow h2 + ul {
  margin-top: 8px;
}

.content-narrow ul {
  padding-left: 24px;
}

@media (max-width: 768px) {
  main.shell.content-narrow {
    padding: 52px 36px 68px;
    margin-top: 48px;
    margin-bottom: 80px;
  }
}

@media (max-width: 640px) {
  .nav a { margin-left: 12px; }
  h1 { font-size: 30px; }
  .shell { padding: 0 20px; }
  main.shell.content-narrow {
    padding: 40px 24px 60px;
    margin-top: 32px;
    margin-bottom: 60px;
  }
}