:root {
  --ink: #16332e;
  --muted: #62736f;
  --green: #0b806b;
  --mint: #dff6ef;
  --sand: #fff0e4;
  --line: rgba(22, 51, 46, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #f8fbfa;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
}
a { color: inherit; }

.nav {
  height: 76px;
  max-width: 1180px;
  margin: auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 800; }
.brand-mark {
  width: 38px; height: 38px; display: grid; place-items: center;
  border-radius: 13px; color: white; background: var(--green);
  box-shadow: 0 8px 22px rgba(11, 128, 107, .22);
}
.nav-link { color: var(--green); font-weight: 700; text-decoration: none; }

main { max-width: 1180px; margin: auto; padding: 0 28px 80px; }
.hero {
  min-height: 620px;
  padding: 76px 70px;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: 60px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 38px;
  background: linear-gradient(135deg, #f4fffb 0%, #eefbf8 52%, #fff0e4 100%);
}
.eyebrow { margin: 0 0 14px; color: var(--green); font-weight: 800; letter-spacing: .12em; }
h1 { margin: 0; font-size: clamp(56px, 8vw, 96px); line-height: 1; letter-spacing: -.05em; }
.lead { max-width: 600px; margin: 28px 0 36px; color: var(--muted); font-size: 21px; line-height: 1.75; }
.actions { display: inline-flex; flex-direction: column; align-items: flex-start; gap: 12px; }
.download {
  display: flex; flex-direction: column; gap: 5px; min-width: 280px;
  padding: 18px 24px; border-radius: 18px; text-decoration: none;
  color: white; background: var(--green); font-size: 19px; font-weight: 800;
  box-shadow: 0 16px 36px rgba(11, 128, 107, .25);
  transition: transform .2s ease, box-shadow .2s ease;
}
.download:hover { transform: translateY(-2px); box-shadow: 0 20px 42px rgba(11, 128, 107, .3); }
.download small { font-size: 13px; font-weight: 500; opacity: .82; }
.download-note { margin: 0; color: var(--muted); font-size: 13px; }
.visual { position: relative; display: grid; place-items: center; }
.visual img {
  position: relative; width: min(100%, 430px); aspect-ratio: 1; object-fit: cover;
  border-radius: 30%; box-shadow: 0 32px 70px rgba(30, 91, 81, .25); z-index: 1;
}
.halo { position: absolute; width: 120%; aspect-ratio: 1; border-radius: 50%; background: rgba(87, 220, 191, .18); filter: blur(4px); }

.features { padding: 100px 0 76px; }
.section-heading { max-width: 680px; }
h2 { margin: 0; font-size: clamp(34px, 5vw, 54px); line-height: 1.15; letter-spacing: -.03em; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 42px; }
.feature-grid article { padding: 30px; border: 1px solid var(--line); border-radius: 24px; background: white; }
.feature-grid span { color: var(--green); font-weight: 800; }
.feature-grid h3 { margin: 28px 0 12px; font-size: 23px; }
.feature-grid p { margin: 0; color: var(--muted); line-height: 1.8; }

.notice {
  padding: 48px;
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 38px;
  border-radius: 30px;
  background: var(--sand);
}
.notice ol { margin: 0; padding-left: 24px; color: var(--muted); line-height: 2; }
.safety { grid-column: 1 / -1; margin: 0; padding-top: 24px; border-top: 1px solid rgba(112, 68, 41, .14); color: #765d50; }

footer {
  max-width: 1180px; margin: auto; padding: 36px 28px 46px;
  display: flex; align-items: flex-end; justify-content: space-between;
  border-top: 1px solid var(--line); color: var(--muted);
}
footer div { display: flex; flex-direction: column; gap: 6px; }
footer strong { color: var(--ink); }
footer a { text-decoration: none; }

@media (max-width: 820px) {
  .nav { height: 66px; padding: 0 18px; }
  main { padding: 0 14px 56px; }
  .hero { min-height: auto; padding: 44px 24px; grid-template-columns: 1fr; gap: 46px; border-radius: 28px; }
  .hero-copy { order: 2; }
  .visual { order: 1; }
  .visual img { width: min(72vw, 330px); }
  .lead { font-size: 17px; }
  .download { width: 100%; min-width: 0; }
  .actions { width: 100%; }
  .features { padding: 70px 0 54px; }
  .feature-grid { grid-template-columns: 1fr; }
  .notice { padding: 30px 24px; grid-template-columns: 1fr; }
  .safety { grid-column: auto; }
  footer { padding: 28px 18px 34px; align-items: flex-start; flex-direction: column; gap: 20px; }
}