:root { color-scheme: light; }
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: min(1100px, 100%); margin: 0 auto; padding: 16px; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(0,0,0,.08);
}
.brand { flex: 0 0 auto; }
.topnav { flex: 1 1 auto; display: flex; justify-content: flex-end; }

.menu { display: flex; gap: 14px; flex-wrap: wrap; }
.menu a { padding: 8px 10px; border-radius: 10px; }
.menu a:focus { outline: 2px solid rgba(0,0,0,.35); outline-offset: 2px; }

.layout {
  display: grid;
  grid-template-columns: 70% 30%;
  gap: 18px;
  align-items: start;
}

.content { min-width: 0; }
.sidebar { min-width: 0; }

.card {
  border: 1px solid rgba(0,0,0,.08);
  border-radius: 14px;
  padding: 14px;
}

.footer {
  border-top: 1px solid rgba(0,0,0,.08);
  margin-top: 24px;
}
.footer-inner { padding: 16px; }

h1 { font-size: 1.8rem; margin: 0 0 12px; }
h2 { font-size: 1.1rem; margin: 0 0 10px; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .topnav { justify-content: flex-start; }
}