* { box-sizing: border-box; }
body {
  font-family: -apple-system, Segoe UI, Roboto, sans-serif;
  background: #111; color: #eee;
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; margin: 0;
}
.card {
  background: #1c1c1c; padding: 32px; border-radius: 12px;
  width: 100%; max-width: 360px; box-shadow: 0 4px 24px rgba(0,0,0,.5);
}
h1 { font-size: 20px; margin: 0 0 20px; }
input {
  width: 100%; padding: 10px 12px; margin-bottom: 12px;
  border: 1px solid #333; border-radius: 8px;
  background: #0d0d0d; color: #eee; font-size: 14px;
}
button {
  width: 100%; padding: 10px; border: 0; border-radius: 8px;
  background: #3b82f6; color: white; font-size: 15px; cursor: pointer;
}
button:hover { background: #2563eb; }
.error { color: #f87171; margin-bottom: 12px; font-size: 14px; }
.success { color: #4ade80; margin-bottom: 12px; font-size: 14px; }
.link { margin-top: 14px; font-size: 14px; text-align: center; }
.link a { color: #60a5fa; text-decoration: none; }