:root {
  color-scheme: light;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  background: #edf3f7;
  color: #173042;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 20% 10%, rgba(30, 136, 168, .18), transparent 32rem),
    linear-gradient(145deg, #edf5f8 0%, #dce8ef 100%);
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: min(100%, 430px);
  padding: 38px;
  border: 1px solid rgba(23, 63, 95, .12);
  border-radius: 20px;
  background: rgba(255, 255, 255, .96);
  box-shadow: 0 24px 70px rgba(25, 57, 77, .16);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 16px;
  background: #173f5f;
  color: white;
  font-weight: 800;
  letter-spacing: .08em;
}

.eyebrow {
  margin: 28px 0 6px;
  color: #147d93;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .14em;
}

h1 { margin: 0; font-size: 28px; line-height: 1.2; }
.intro { margin: 12px 0 26px; color: #607584; line-height: 1.55; }
form { display: grid; gap: 18px; }
label { display: grid; gap: 8px; font-size: 13px; font-weight: 700; }

input {
  width: 100%;
  border: 1px solid #bdccd5;
  border-radius: 10px;
  padding: 12px 14px;
  background: #fff;
  color: #173042;
  font: inherit;
  outline: none;
}

input:focus {
  border-color: #14839b;
  box-shadow: 0 0 0 3px rgba(20, 131, 155, .14);
}

button {
  border: 0;
  border-radius: 10px;
  padding: 13px 18px;
  background: #173f5f;
  color: #fff;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

button:disabled { opacity: .6; cursor: wait; }
.error { min-height: 20px; margin: -4px 0; color: #b42318; font-size: 13px; }
.security-note { margin: 24px 0 0; color: #7a8b96; font-size: 12px; text-align: center; }

@media (max-width: 520px) {
  .login-card { padding: 28px 22px; }
}