:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #59657a;
  --line: #cdd5df;
  --brand: #145ca8;
  --brand-dark: #0d477f;
  --danger-bg: #fff0f0;
  --danger: #9d1c20;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: linear-gradient(145deg, #edf3fa, #f7f9fc 60%, #e5edf7);
  color: var(--ink);
}
.login-shell { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card {
  width: min(100%, 410px);
  background: #fff;
  padding: 32px;
  border: 1px solid #dde3eb;
  border-radius: 16px;
  box-shadow: 0 20px 55px rgba(24, 52, 88, .13);
}
.login-mark {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 14px;
  color: #fff;
  background: var(--brand);
  font-weight: 800;
  letter-spacing: .08em;
}
h1 { margin: 20px 0 6px; font-size: 1.55rem; }
.login-lead { margin: 0 0 24px; color: var(--muted); }
label { display: block; margin: 14px 0 6px; font-weight: 700; }
input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}
input:focus-visible, button:focus-visible { outline: 3px solid rgba(20, 92, 168, .3); outline-offset: 2px; }
button {
  width: 100%;
  min-height: 44px;
  margin-top: 22px;
  border: 0;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}
button:hover { background: var(--brand-dark); }
.login-error {
  margin: 16px 0;
  padding: 12px;
  border-radius: 8px;
  background: var(--danger-bg);
  color: var(--danger);
  font-weight: 650;
}