* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
  background: #f7f7fb;
  color: #111827;
}
.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}
.site-header {
  background: #f0eeea;
  color: black;
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-header nav a {
  font-weight: 500;
  color: #305296;
  text-decoration: none;
  margin-left: 12px;
  transition: color 0.3s ease;
}
.site-header nav a:hover {
  color: #1b0000;
}
main.container {
  padding-top: 24px;
  padding-bottom: 24px;
}
.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 16px 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
h1,
h2,
h3 {
  margin: 0 0 12px 0;
}
p,
ul,
ol,
li {
  line-height: 1.6;
}
.site-footer {
  background: #f3f4f6;
  border-top: 1px solid #e5e7eb;
}
.site-footer .container {
  text-align: center;
  padding: 16px;
  color: #6b7280;
}