body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    margin: 0;
    padding: 0;
    background: #0b1120;
    color: #e5e7eb;
}
header{
  position: sticky;
  top: 0;
  z-index: 20;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
  padding: 10px 16px;
  background: linear-gradient(180deg,#020617,#020617);
  border-bottom: 1px solid rgba(30,41,59,.9);
  box-shadow: 0 10px 30px rgba(0,0,0,.45);
}
.site-menu {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
}
.site-menu a {
    color: #e5e7eb;
    text-decoration: none;
    padding: 0.35rem 0.8rem;
    border: 1px solid rgba(148,163,184,0.4);
    font-size: 0.9rem;
}
.site-menu a:hover {
    background: rgba(56,189,248,0.12);
    border-color: #38bdf8;
}
main {
    padding: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}
footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(148,163,184,0.3);
    font-size: 0.8rem;
    color: #9ca3af;
    text-align: center;
}