:root {
  --green: #1DC54D;
  --green-dark: #16a341;
  --ink: #18211b;
  --muted: #5b6b60;
  --bg: #f6fbf7;
  --card: #ffffff;
  --line: #e4efe7;
  --radius: 18px;
  --maxw: 820px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--green-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin: 0 auto; padding: 22px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; color: var(--ink); }
.brand .mark {
  width: 34px; height: 34px; border-radius: 9px; background: var(--green);
  display: grid; place-items: center; box-shadow: 0 4px 14px rgba(29,197,77,.35);
}
.brand .mark svg { width: 20px; height: 20px; }
.nav .links a { color: var(--muted); font-weight: 600; font-size: 14px; margin-left: 18px; }

/* Hero */
.hero { text-align: center; max-width: var(--maxw); margin: 0 auto; padding: 48px 24px 30px; }
.hero .badge {
  width: 84px; height: 84px; border-radius: 22px; background: var(--green);
  display: grid; place-items: center; margin: 0 auto 22px; box-shadow: 0 10px 30px rgba(29,197,77,.35);
}
.hero .badge svg { width: 48px; height: 48px; }
.hero h1 { font-size: 40px; line-height: 1.1; margin: 0 0 14px; letter-spacing: -.5px; }
.hero p { font-size: 19px; color: var(--muted); max-width: 560px; margin: 0 auto 26px; }
.btn {
  display: inline-block; background: var(--green); color: #fff; font-weight: 700;
  padding: 14px 26px; border-radius: 999px; box-shadow: 0 8px 22px rgba(29,197,77,.35);
}
.btn:hover { background: var(--green-dark); text-decoration: none; }

/* Feature grid */
.features { max-width: var(--maxw); margin: 10px auto; padding: 10px 24px 40px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.feature h3 { margin: 0 0 6px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }
@media (max-width: 640px) { .features { grid-template-columns: 1fr; } .hero h1 { font-size: 32px; } }

/* Content pages */
.page { max-width: var(--maxw); margin: 0 auto; padding: 20px 24px 60px; }
.page .card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 32px; }
.page h1 { font-size: 30px; margin: 8px 0 4px; }
.page .updated { color: var(--muted); font-size: 14px; margin-bottom: 22px; }
.page h2 { font-size: 19px; margin: 28px 0 8px; }
.page p, .page li { color: #2c3a30; font-size: 15.5px; }
.page ul { padding-left: 20px; }
.back { display: inline-block; margin-bottom: 6px; font-weight: 600; font-size: 14px; }

/* Footer */
.footer { max-width: var(--maxw); margin: 0 auto; padding: 26px 24px 50px; border-top: 1px solid var(--line); text-align: center; color: var(--muted); font-size: 13.5px; }
.footer a { color: var(--muted); margin: 0 9px; font-weight: 600; }