* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: #f6f6f6;
  color: #171717;
  font-family: Arial, Helvetica, sans-serif;
  display: grid;
  place-items: center;
}
.card {
  width: min(420px, calc(100% - 32px));
  background: #fff;
  border: 1px solid #dedede;
  border-radius: 10px;
  padding: 28px;
}
.brand { display: flex; gap: 12px; align-items: center; margin-bottom: 22px; }
.logo {
  width: 40px; height: 40px; border-radius: 8px;
  display: grid; place-items: center; background: #111; color: #fff;
  font-weight: 700;
}
h1 { margin: 0; font-size: 20px; }
p { line-height: 1.5; }
.muted { color: #555; }
.small { color: #777; font-size: 12px; margin-top: 18px; }
.button {
  display: block; text-align: center; text-decoration: none;
  background: #111; color: #fff; border-radius: 7px;
  padding: 12px 16px; margin-top: 20px;
}
.button:hover { background: #222; }
form { display: grid; gap: 12px; }
label { font-size: 13px; font-weight: 600; }
input {
  width: 100%; padding: 11px; border: 1px solid #ccc; border-radius: 6px;
  font: inherit;
}
button {
  border: 0; border-radius: 7px; padding: 12px 16px;
  background: #111; color: #fff; font: inherit; cursor: pointer;
}
.error {
  border: 1px solid #e0b4b4; background: #fff6f6;
  padding: 12px; border-radius: 7px; color: #8b1e1e;
}
.success {
  border: 1px solid #b8d7bd; background: #f5fff6;
  padding: 12px; border-radius: 7px; color: #205b29;
}