:root { color-scheme: light dark; }
body {
  font-family: system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #171717;
  color: #f5f5f5;
}
form {
  background: #232323;
  border-radius: 16px;
  padding: 2rem;
  width: min(320px, 90vw);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}
h1 { font-size: 1.05rem; margin: 0 0 1.25rem; font-weight: 600; }
input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.75rem;
  border-radius: 10px;
  border: 1px solid #3a3a3a;
  background: #141414;
  color: #f5f5f5;
  font-size: 1rem;
  margin-bottom: 1rem;
}
button {
  width: 100%;
  padding: 0.75rem;
  border-radius: 10px;
  border: none;
  background: #b8863b;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
}
p.error { color: #e8a0a0; font-size: 0.85rem; margin: -0.5rem 0 1rem; }