/* Base reset + typography */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #1c1c1e;
  background: #ffffff;
  margin: 0;
  padding: 0;
}
main {
  max-width: 780px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}
header {
  border-bottom: 1px solid #e5e5ea;
  padding-bottom: 24px;
  margin-bottom: 32px;
}
header h1 {
  font-size: 32px;
  font-weight: 700;
  margin: 0 0 8px;
  color: #000;
}
header .subtitle {
  font-size: 14px;
  color: #6b6b70;
  margin: 0;
}
.lang-switch {
  font-size: 14px;
  margin-top: 16px;
}
.lang-switch a {
  color: #6366f1;
  text-decoration: none;
  margin-right: 12px;
}
.lang-switch a:hover { text-decoration: underline; }
h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 40px 0 12px;
  color: #000;
}
h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
  color: #000;
}
p, li {
  font-size: 16px;
  margin: 0 0 12px;
}
ul, ol {
  padding-left: 24px;
  margin: 0 0 16px;
}
a {
  color: #6366f1;
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover { color: #4f52cc; }
strong { font-weight: 600; }
footer {
  border-top: 1px solid #e5e5ea;
  padding-top: 24px;
  margin-top: 48px;
  font-size: 14px;
  color: #6b6b70;
  text-align: center;
}
@media (prefers-color-scheme: dark) {
  body { background: #0d0d0f; color: #e5e5ea; }
  header h1, h2, h3 { color: #ffffff; }
  header { border-bottom-color: #2c2c2e; }
  footer { border-top-color: #2c2c2e; color: #8e8e93; }
  header .subtitle, footer { color: #8e8e93; }
  a { color: #818cf8; }
  a:hover { color: #a5b0ff; }
}