body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background: #f4f4f9;
  color: #111;
}

body.dark {
  background: #0f172a;
  color: #e5e7eb;
}

header { background:#fff; border-bottom:1px solid #eee; }
body.dark header { background:#020617; border-bottom-color:#1e293b; }

.wrap { max-width:900px; margin:0 auto; padding:16px; }
.card { background:#fff; padding:24px; border-radius:14px; }
body.dark .card { background:#020617; }

.grid { display:grid; gap:16px; }
button { padding:10px 14px; border-radius:10px; cursor:pointer; }
.muted { color:#555; }
body.dark .muted { color:#9ca3af; }

button {
  padding: 10px 14px;
  border: none;
  border-radius: 10px;
  background: #2563eb;
  color: rgb(255, 255, 255);
  font-size: 14px;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

nav a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: #111;
}

nav a:hover {
  background: #909295;
}

body.dark nav a {
  color: #386eda;
}

body.dark nav a:hover {
  background: #1e293b;
}