:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f3f6fa;
  color: #18212f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 15%, rgba(52, 112, 255, .10), transparent 32rem),
    #f3f6fa;
}

.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 18px;
}

.card {
  width: min(100%, 420px);
  padding: 38px;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  box-shadow: 0 22px 60px rgba(15, 23, 42, .11);
}

.brand {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: #2156d8;
  color: #fff;
  font-size: 21px;
  font-weight: 750;
  box-shadow: 0 8px 20px rgba(33, 86, 216, .28);
}

.eyebrow {
  margin: 22px 0 8px;
  color: #64748b;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
}

h1 {
  margin: 0;
  font-size: 27px;
  line-height: 1.25;
  letter-spacing: -.02em;
}

.intro {
  margin: 10px 0 25px;
  color: #64748b;
  line-height: 1.55;
}

.alert {
  margin: 18px 0 22px;
  padding: 12px 14px;
  border: 1px solid #fecaca;
  border-radius: 9px;
  background: #fef2f2;
  color: #991b1b;
  font-size: 14px;
  line-height: 1.45;
}

form { display: grid; gap: 9px; }

label {
  margin-top: 8px;
  font-size: 14px;
  font-weight: 650;
}

input {
  width: 100%;
  height: 46px;
  padding: 0 13px;
  border: 1px solid #cbd5e1;
  border-radius: 9px;
  background: #fff;
  color: #0f172a;
  font: inherit;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}

input:focus {
  border-color: #3470ff;
  box-shadow: 0 0 0 3px rgba(52, 112, 255, .14);
}

button {
  height: 47px;
  margin-top: 18px;
  border: 0;
  border-radius: 9px;
  background: #2156d8;
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:hover { background: #1948bd; }

@media (max-width: 500px) {
  .card { padding: 28px 22px; }
}