:root { color-scheme: dark; }
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: #0B0D12; color: #E6F1F5; font: 15px/1.4 "Segoe UI", Arial, sans-serif; padding: 16px;
}
.card {
  width: 100%; max-width: 380px; background: #10151D; border: 1px solid #1E3540; border-radius: 14px; padding: 28px;
}
.brand { color: #4FD1E8; font-weight: 700; letter-spacing: 2px; font-size: 13px; }
h1 { font-size: 20px; margin: 10px 0 18px; }
label { display: block; color: #8FA3B0; font-size: 13px; margin: 12px 0 6px; }
input {
  width: 100%; height: 42px; border-radius: 8px; border: 1px solid #2A4A58; background: #11161E;
  color: #E6F1F5; padding: 0 12px; font-size: 15px;
}
input:focus { outline: none; border-color: #4FD1E8; }
button {
  width: 100%; height: 44px; margin-top: 18px; border: 0; border-radius: 8px; background: #4FD1E8;
  color: #0B0D12; font-weight: 700; font-size: 15px; cursor: pointer;
}
button:disabled { opacity: .6; cursor: default; }
.error { color: #E5533D; font-size: 13px; min-height: 18px; margin-top: 10px; }
.hint { color: #8FA3B0; font-size: 12px; margin: 14px 0 0; }