:root {
  color-scheme: light;
  --ink: #101624;
  --muted: #596273;
  --line: rgba(16, 22, 36, 0.12);
  --soft: #f5f8fb;
  --green: #087c6f;
  --blue: #2f72d6;
  --shadow: 0 26px 70px rgba(34, 48, 73, 0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: #fff;
  letter-spacing: 0;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(16, 22, 36, 0.08);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(170%) blur(18px);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
}

.nav-links a:hover { color: var(--green); }

.section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 78px 22px;
}

.hero {
  padding-top: 92px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-weight: 800;
  font-size: 14px;
}

h1, h2, h3 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(42px, 8vw, 88px);
  line-height: 0.96;
}

h2 {
  font-size: clamp(32px, 5vw, 58px);
  line-height: 1.05;
}

h3 {
  font-size: 24px;
  line-height: 1.18;
}

.lead {
  max-width: 780px;
  margin: 24px auto 0;
  color: var(--muted);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.65;
}

.actions {
  margin-top: 30px;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  font-weight: 800;
}

.button.primary {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.button.blue {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
}

.media-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--soft);
  box-shadow: var(--shadow);
}

.media-card img {
  width: 100%;
  height: auto;
}

.copy p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.78;
}

.points {
  display: grid;
  gap: 12px;
  margin-top: 22px;
}

.point {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  align-items: start;
  color: var(--muted);
  line-height: 1.72;
}

.point span {
  display: inline-flex;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  align-items: center;
  justify-content: center;
  color: var(--green);
  background: rgba(8, 124, 111, 0.1);
  font-weight: 900;
}

.download-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 22px 0;
}

.download-step {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 12px 28px rgba(34, 48, 73, 0.08);
}

.download-step img {
  width: 100%;
  height: 160px;
  object-fit: contain;
  background: #f7fafc;
}

.download-step p {
  margin: 0;
  padding: 12px 14px 14px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.related {
  background: var(--soft);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 24px;
  overflow: hidden;
}

.related-card {
  background: #fff;
  padding: 28px;
}

.related-card p {
  color: var(--muted);
  line-height: 1.65;
}

footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 22px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--green);
  font-weight: 700;
}

@media (max-width: 820px) {
  .nav-links { display: none; }
  .section { padding: 58px 18px; }
  .hero { text-align: left; padding-top: 64px; }
  .lead { margin-left: 0; }
  .actions { justify-content: flex-start; }
  .feature-grid, .related-grid { grid-template-columns: 1fr; }
  .download-steps { grid-template-columns: 1fr; }
}