* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: #f4f4f7;
  color: #1f2430;
}
.card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(20, 24, 40, 0.08);
  padding: 2.5rem 2rem;
  max-width: 26rem;
  width: 100%;
}
h1 { margin: 0 0 0.5rem; font-size: 1.6rem; }
.sub { margin: 0 0 1.5rem; color: #5a6270; font-size: 0.95rem; }
label { display: block; font-weight: 600; margin-bottom: 0.4rem; font-size: 0.9rem; }
input {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid #c9ced8;
  border-radius: 8px;
  font-size: 1rem;
  margin-bottom: 0.9rem;
}
input:focus { outline: 2px solid #3b5bdb; outline-offset: 1px; border-color: #3b5bdb; }
button {
  width: 100%;
  padding: 0.75rem;
  background: #3b5bdb;
  color: #fff;
  border: 0;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
button:hover { background: #3350c4; }
button:disabled { background: #8fa0e0; cursor: default; }
.message { min-height: 1.4rem; margin: 1rem 0 0; font-size: 0.95rem; }
.message.success { color: #1c7d3c; }
.message.error { color: #c42b2b; }
.message.info { color: #5a6270; }