:root {
  color: #1d2b38;
  background: #f6f8fb;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  margin: 0;
  background: #f6f8fb;
}

.page-shell {
  width: min(920px, calc(100% - 40px));
  min-height: calc(100vh - 88px);
  margin: 0 auto;
  padding: 30px 0 72px;
}

.site-header {
  padding: 12px 0 48px;
}

.site-name {
  color: #1e5a96;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0;
  text-decoration: none;
}

.intro {
  max-width: 630px;
  padding: 28px 0 54px;
  border-bottom: 1px solid #dce4ec;
}

.eyebrow {
  margin: 0 0 12px;
  color: #5b7287;
  font-size: 14px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 16px;
  color: #1d2b38;
  font-size: 34px;
  line-height: 1.3;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 12px;
  color: #243443;
  font-size: 20px;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  color: #243443;
  font-size: 17px;
  letter-spacing: 0;
}

.lead,
.content-section p {
  margin-bottom: 0;
  color: #5b6b78;
  font-size: 16px;
  line-height: 1.8;
}

.content-section {
  padding: 44px 0;
  border-bottom: 1px solid #dce4ec;
}

.section-heading {
  margin-bottom: 22px;
}

.tool-item {
  padding: 22px 24px;
  border: 1px solid #d7e0e8;
  border-radius: 6px;
  background: #ffffff;
}

.about {
  border-bottom: 0;
}

.site-footer {
  padding: 28px 20px 32px;
  border-top: 1px solid #dce4ec;
  color: #6c7b88;
  text-align: center;
}

.site-footer a {
  color: #6c7b88;
  font-size: 14px;
  text-decoration: none;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: #1e5a96;
  text-decoration: underline;
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 32px, 920px);
    padding-top: 18px;
  }

  .site-header {
    padding-bottom: 30px;
  }

  .intro {
    padding: 20px 0 40px;
  }

  h1 {
    font-size: 28px;
  }
}