* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #162030;
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh;
}
.card {
  background: #1a3a4a;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0,0,0,.4);
  padding: 40px 36px;
  width: 100%;
  max-width: 360px;
}
h1 {
  font-size: 20px;
  font-weight: 700;
  color: #e8f4f8;
  margin-bottom: 6px;
}
.subtitle {
  font-size: 13px;
  color: #4fc3f7;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 28px;
}
label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: #a0c4d8;
  margin-bottom: 5px;
}
input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 7px;
  font-size: 14px;
  margin-bottom: 16px;
  outline: none;
  background: rgba(255,255,255,.07);
  color: #e8f4f8;
  transition: border-color .15s;
}
input:focus { border-color: #4fc3f7; }
button {
  width: 100%;
  padding: 11px;
  background: #4fc3f7;
  color: #162030;
  border: none;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background .15s;
}
button:hover { background: #81d4fa; }
.error {
  background: rgba(198,40,40,.2);
  color: #ef9a9a;
  border: 1px solid rgba(198,40,40,.4);
  border-radius: 7px;
  padding: 10px 12px;
  font-size: 13px;
  margin-bottom: 16px;
}