:root {
  color-scheme: light;
  --bg: #f6f4ed;
  --surface: #ffffff;
  --ink: #13261a;
  --muted: #5f6b63;
  --line: #dfe7df;
  --accent: #2f9d50;
  --accent-soft: #edf8ef;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
}

a { color: var(--accent); }

.shell {
  width: min(920px, calc(100% - 36px));
  margin: 0 auto;
}

header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .92);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 24px;
}

.brand {
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
}

.links { display: flex; gap: 18px; }
.links a { color: var(--muted); text-decoration: none; }
main { padding: 64px 0 80px; }

.hero, .card {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: 0 20px 50px rgba(19, 38, 26, .07);
}

.hero { padding: clamp(34px, 7vw, 72px); }
.card { padding: clamp(26px, 5vw, 48px); }
.eyebrow { color: var(--accent); font-size: 13px; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.25; }
h1 { margin: 14px 0 18px; font-size: clamp(36px, 7vw, 62px); }
h2 { margin: 38px 0 12px; font-size: 24px; }
h3 { margin: 28px 0 8px; font-size: 18px; }
p, li { color: var(--muted); }
.lead { max-width: 710px; font-size: 19px; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 34px;
}

.feature { border: 1px solid var(--line); border-radius: 14px; background: #fbfcfb; padding: 20px; }
.feature strong { display: block; margin-bottom: 6px; }
.notice { margin: 24px 0; border-left: 4px solid var(--accent); border-radius: 10px; background: var(--accent-soft); padding: 16px 18px; }
.button { display: inline-block; margin-top: 14px; border-radius: 10px; background: var(--accent); color: white; font-weight: 650; padding: 11px 18px; text-decoration: none; }
.divider { margin: 48px 0; border: 0; border-top: 1px solid var(--line); }
footer { padding: 28px 0 46px; color: var(--muted); font-size: 14px; }
footer .shell { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }

@media (max-width: 720px) {
  .feature-grid { grid-template-columns: 1fr; }
  nav { align-items: flex-start; flex-direction: column; padding: 16px 0; }
}