* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.65;
  color: #1c1c1e;
  background: #f7f7f8;
  -webkit-font-smoothing: antialiased;
}
a { color: #22c55e; text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 760px; margin: 0 auto; padding: 24px; }
nav { background: #fff; border-bottom: 1px solid #e5e5ea; }
nav .wrap {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 14px; padding-bottom: 14px;
}
nav .logo { font-size: 17px; font-weight: 700; color: #1c1c1e; }
nav .links a { margin-left: 20px; font-size: 14px; color: #555; }
.hero {
  background: linear-gradient(180deg, #f0fdf4 0%, #f7f7f8 100%);
  padding: 80px 24px 60px;
  text-align: center;
}
.hero h1 {
  font-size: 44px; font-weight: 800; line-height: 1.15; margin-bottom: 16px;
  letter-spacing: -0.03em;
}
.hero .sub { font-size: 18px; color: #555; max-width: 520px; margin: 0 auto 28px; }
.cta {
  display: inline-block; padding: 14px 30px; background: #22c55e; color: #fff !important;
  font-weight: 700; border-radius: 12px; font-size: 17px;
  box-shadow: 0 4px 14px rgba(34,197,94,0.3);
}
.cta:hover { text-decoration: none; background: #16a34a; }
.features { padding: 60px 0; }
.features h2 { text-align: center; font-size: 28px; margin-bottom: 36px; letter-spacing: -0.02em; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.feature { background: #fff; border: 1px solid #e5e5ea; border-radius: 14px; padding: 22px; }
.feature h3 { font-size: 17px; margin-bottom: 8px; }
.feature p { color: #555; font-size: 14px; }
article { background: #fff; border: 1px solid #e5e5ea; border-radius: 14px; padding: 36px; margin: 40px 0; }
article h1 { font-size: 30px; margin-bottom: 10px; letter-spacing: -0.02em; }
article .updated { color: #888; font-size: 13px; margin-bottom: 28px; }
article h2 { font-size: 20px; margin-top: 28px; margin-bottom: 10px; }
article p { margin-bottom: 12px; color: #333; }
article ul { margin: 0 0 12px 20px; color: #333; }
article li { margin-bottom: 6px; }
article strong { color: #1c1c1e; }
footer { border-top: 1px solid #e5e5ea; background: #fff; padding: 24px 0; margin-top: 60px; }
footer .wrap { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
footer .links a { margin-right: 16px; font-size: 13px; color: #555; }
footer .copy { font-size: 13px; color: #888; }
@media (max-width: 600px) {
  .hero { padding: 56px 20px 44px; }
  .hero h1 { font-size: 32px; }
  article { padding: 22px; }
}