html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  overflow-x: hidden;
}

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f0f8ff;
  padding: 0 0 60px 0;
  color: #1A237E;
  max-width: 100vw;
}

header {
  background: linear-gradient(90deg, #13347B 80%, #2685BE 100%);
  color: #fff;
  padding: 30px 4vw 18px 4vw;
  border-radius: 0 0 20px 20px;
  margin-bottom: 15px;
  box-shadow: 0 1px 10px 0 #0002;
  text-align: center;
}

.header-icon {
  font-size: 2.2rem;
  vertical-align: middle;
  margin-bottom: 2px;
  margin-right: 8px;
}

h1 {
  margin: 0 0 7px 0;
  font-size: 2.1rem;
  letter-spacing: 0.01em;
  font-weight: 700;
  display: block;
  word-break: break-word;
  line-height: 1.18;
}

.header-sub {
  color: #BFE8FF;
  margin: 5px auto 0 auto;
  max-width: 97vw;
  font-size: 1.1rem;
  line-height: 1.3;
  word-break: break-word;
}

.main {
  max-width: 950px;
  margin: 0 auto;
  background: #fff;
  border-radius: 12px;
  padding: 24px 3vw 24px 3vw;
  box-shadow: 0 1px 12px 0 #0001;
  word-break: break-word;
  width: 98vw;
  box-sizing: border-box;
}

section {
  background: #e3f2fd;
  padding: 20px;
  border-radius: 6px;
  margin-bottom: 30px;
  box-shadow: 0 1px 3px #0001;
  overflow-x: auto;
}

h2 {
  color: #0D47A1;
  margin-top: 0;
  font-size: 1.21rem;
}

h3 {
  color: #0D47A1;
  margin: 16px 0 8px 0;
  font-size: 1.07rem;
}

code, pre {
  background: #263238;
  color: #ECEFF1;
  padding: 6px 7px;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.97em;
  word-break: break-all;
  display: inline-block;
  max-width: 95vw;
  box-sizing: border-box;
}

ul, ol {
  margin-left: 18px;
  padding-left: 14px;
}

li {
  margin: 4px 0;
}

footer {
  text-align: center;
  padding: 16px;
  color: #1A237E;
  background: #F3F9FE;
  position: fixed;
  width: 100vw;
  left: 0;
  bottom: 0;
  font-size: 0.97rem;
  border-top: 1px solid #e1e8f4;
  z-index: 20;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #13347B;
  color: #fff;
  font-size: .85em;
  margin-right: 6px;
}

@media (max-width: 700px) {
  header {
    padding: 15px 2vw 11px 2vw;
    border-radius: 0 0 13px 13px;
  }

  h1 {
    font-size: 1.15rem;
  }

  .main {
    padding: 9px 1vw 12vw 1vw;
    width: 99vw;
  }

  section {
    padding: 10px 2vw 8px 2vw;
    font-size: 1em;
  }

  .header-sub {
    font-size: 0.99rem;
  }
}

@media (max-width: 420px) {
  h1 {
    font-size: 1.01rem;
  }

  .main {
    padding: 6px 0 20vw 0;
    width: 100vw;
  }

  .header-icon {
    font-size: 1.5rem;
  }
}