body {
  margin: 0;
  font-family: 'Inter', Arial, sans-serif;
  background: #f7faff;
  color: #23252a;
}
header {
  background: #fff;
  box-shadow: 0 1px 16px rgba(0, 30, 100, 0.06);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.logo-wrap {
  display: flex;
  align-items: center;
  max-width: 900px;
  margin: 0 auto;
  gap: 18px;
  justify-content: flex-start;
}
.logo {
  width: 58px;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(60,90,250,.09);
}
.site-title h1 {
  font-size: 1.25em;
  color: #245be2;
  font-weight: 700;
  margin: 0;
}
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 0 28px rgba(30,50,90,0.045);
}

section { margin-bottom: 1.2em; }
h2 {
  color: #245be2;
  font-weight: 700;
  margin-top: 28px;
  margin-bottom: 10px;
}
h3 {
  color: #485468;
  font-weight: 500;
  margin-top: 16px;
  margin-bottom: 8px;
}
ul, ol {
  margin-left: 30px;
  margin-bottom: 12px;
}
@media (max-width: 600px) {
  header, main {
    border-radius: 0;
    box-shadow: none;
  }
  .logo-wrap {
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
  }
  .site-title h1 {
    font-size: 1em;
  }
  main {
    padding: 7px;
  }
  h1, h2 {
    font-size: 1em;
  }
}

.site-footer {
  background: #f5f7fc;
  color: #3855a8;
  text-align: center;
  padding: 28px 16px 20px 16px;
  font-size: 1em;
  border-top: 1px solid #e3eaf2;
  box-shadow: 0 -2px 16px rgba(60,90,250,0.03);
  margin-top: 56px;
}
.site-footer a {
  color: #245be2;
  text-decoration: underline dotted;
  font-weight: 500;
}
.site-footer .footer-content {
  max-width: 900px;
  margin: 0 auto;
}
.site-footer p {
  margin: 0 0 14px 0;
  line-height: 1.6;
}
@media (max-width: 600px) {
  .site-footer {
    font-size: 0.94em;
    padding: 16px 5px 14px 5px;
  }
}