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; }

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; }

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;
}

@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; }
}