:root{
  --bg:#f4fbf8;
  --surface:#ffffff;
  --text:#17342f;
  --muted:#61766f;
  --accent:#15a97d;
  --accent2:#3bcf9a;
  --line:#dcebe6;
  --shadow:0 16px 40px rgba(20,80,65,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Sans","Yu Gothic",sans-serif;
  color:var(--text);
  background:
    radial-gradient(circle at top right, rgba(59,207,154,.12), transparent 34rem),
    var(--bg);
  line-height:1.75;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.site-header{
  position:sticky; top:0; z-index:10;
  backdrop-filter:blur(14px);
  background:rgba(244,251,248,.86);
  border-bottom:1px solid rgba(220,235,230,.85);
}
.nav{
  max-width:900px; margin:0 auto; padding:14px 20px;
  display:flex; align-items:center; justify-content:space-between; gap:18px;
}
.brand{font-weight:800; letter-spacing:-.02em; color:var(--text); display:flex; align-items:center; gap:10px}
.logo{
  width:34px;height:34px;border-radius:10px;
  display:grid;place-items:center;
  color:white;font-weight:900;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  box-shadow:0 8px 18px rgba(21,169,125,.24);
}
.nav-links{display:flex;gap:14px;flex-wrap:wrap;font-size:.93rem}
main{max-width:900px;margin:0 auto;padding:58px 20px 80px}
.hero{padding:22px 0 34px}
.eyebrow{color:var(--accent);font-weight:800;font-size:.85rem;letter-spacing:.08em;text-transform:uppercase}
h1{font-size:clamp(2rem,5vw,3.5rem);line-height:1.12;letter-spacing:-.045em;margin:.4rem 0 1rem}
h2{font-size:1.35rem;letter-spacing:-.02em;margin:2.2rem 0 .8rem}
h3{font-size:1.05rem;margin:1.5rem 0 .45rem}
.lead{font-size:1.08rem;color:var(--muted);max-width:720px}
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:24px;
  padding:26px;
  margin:18px 0;
  box-shadow:var(--shadow);
}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.button{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:52px;padding:0 22px;border-radius:16px;
  color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent2));
  font-weight:800;box-shadow:0 10px 22px rgba(21,169,125,.2)
}
.button:hover{text-decoration:none;filter:brightness(.98)}
.secondary{
  background:#eef8f4;color:var(--accent);box-shadow:none;border:1px solid var(--line)
}
ul{padding-left:1.35rem}
.note{
  padding:16px 18px;border-left:4px solid var(--accent);
  background:#eef8f4;border-radius:10px;color:#46655c;
}
.meta{color:var(--muted);font-size:.9rem}
footer{
  max-width:900px;margin:0 auto;padding:26px 20px 44px;
  color:var(--muted);font-size:.9rem;border-top:1px solid var(--line)
}
.footer-links{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:8px}
@media(max-width:640px){
  main{padding-top:38px}
  .grid{grid-template-columns:1fr}
  .nav{align-items:flex-start}
  .nav-links{justify-content:flex-end}
  .card{padding:20px;border-radius:20px}
}