:root { color-scheme: light dark; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  color: #111;
  background: #fff;
}
@media (prefers-color-scheme: dark) {
  body { color: #eee; background: #111; }
  a { color: #8ab4ff; }
}
h1 { font-size: 1.75rem; font-weight: 700; margin-bottom: 0.25rem; }
.meta { color: #666; font-size: 0.9rem; margin-bottom: 2rem; }
@media (prefers-color-scheme: dark) { .meta { color: #aaa; } }
h2 { font-size: 1.1rem; font-weight: 600; margin: 2rem 0 0.75rem; }
h3 { font-size: 1rem; font-weight: 600; margin: 1.25rem 0 0.5rem; }
ul { padding-left: 1.25rem; margin: 0.5rem 0; }
li { margin: 0.35rem 0; }
hr { border: none; border-top: 1px solid rgba(0,0,0,0.08); margin: 2rem 0; }
@media (prefers-color-scheme: dark) {
  hr { border-top-color: rgba(255,255,255,0.12); }
}
a { color: #0645ad; }
strong { font-weight: 600; }
.nav { display: flex; flex-wrap: wrap; gap: 0.75rem 1.25rem; margin-bottom: 2rem; font-size: 0.95rem; }
.card {
  background: rgba(0,0,0,0.03);
  border-radius: 16px;
  padding: 1.25rem;
  margin: 1rem 0;
}
@media (prefers-color-scheme: dark) {
  .card { background: rgba(255,255,255,0.06); }
}
label { display: block; font-weight: 600; margin: 1rem 0 0.35rem; font-size: 0.92rem; }
input, select, textarea {
  width: 100%;
  box-sizing: border-box;
  font: inherit;
  padding: 0.75rem 0.85rem;
  border: none;
  border-radius: 12px;
  background: rgba(0,0,0,0.05);
  color: inherit;
}
@media (prefers-color-scheme: dark) {
  input, select, textarea { background: rgba(255,255,255,0.08); }
}
textarea { min-height: 140px; resize: vertical; }
button {
  margin-top: 1.25rem;
  width: 100%;
  font: inherit;
  font-weight: 600;
  padding: 0.9rem 1rem;
  border: none;
  border-radius: 14px;
  background: #111;
  color: #fff;
  cursor: pointer;
}
@media (prefers-color-scheme: dark) {
  button { background: #fff; color: #111; }
}
button:disabled { opacity: 0.55; cursor: not-allowed; }
.status { margin-top: 1rem; font-size: 0.95rem; }
.status.ok { color: #1a7f37; }
.status.err { color: #c65314; }