:root {
  color-scheme: light;
  --ink: #17384a;
  --muted: #627985;
  --blue: #248ccb;
  --line: #d9eaf3;
  --panel: rgba(255, 255, 255, 0.94);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  background:
    radial-gradient(circle at 15% 12%, rgba(83, 181, 231, 0.22), transparent 28%),
    radial-gradient(circle at 85% 80%, rgba(176, 219, 242, 0.3), transparent 32%),
    linear-gradient(180deg, #f5fbff 0%, #e8f5fc 100%);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
}

.public-shell {
  display: grid;
  width: min(960px, calc(100% - 32px));
  flex: 1;
  margin: 0 auto;
  place-items: center;
  padding: 48px 0 28px;
}

.hero-card {
  width: 100%;
  padding: clamp(28px, 6vw, 64px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 32px;
  background: var(--panel);
  box-shadow: 0 24px 70px rgba(34, 105, 143, 0.14);
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 7px 14px;
  border-radius: 999px;
  background: #e7f6ff;
  color: #1875aa;
  font-size: 14px;
}

h1 {
  margin: 0;
  font-size: clamp(40px, 9vw, 76px);
  letter-spacing: 0.08em;
}

.lead {
  max-width: 680px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: clamp(17px, 3vw, 21px);
  line-height: 1.8;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.feature-grid article {
  display: grid;
  gap: 8px;
  padding: 22px 16px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #f8fcff;
}

.feature-grid strong {
  color: #186f9f;
  font-size: 18px;
}

.feature-grid span,
.wechat-tip {
  color: var(--muted);
  line-height: 1.6;
}

.wechat-tip {
  margin: 28px 0 0;
  font-weight: 600;
}

.public-footer {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 18px 16px 24px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.public-footer a {
  color: inherit;
  text-decoration: none;
}

.public-footer a:hover,
.public-footer a:focus-visible {
  color: var(--blue);
  text-decoration: underline;
}

@media (max-width: 680px) {
  .public-shell {
    width: min(100% - 20px, 960px);
    padding-top: 20px;
  }

  .hero-card {
    border-radius: 24px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .public-footer {
    flex-direction: column;
    gap: 7px;
  }
}