:root {
  color-scheme: dark;
  --bg: #0d1117;
  --panel: #161d27;
  --line: #2c3745;
  --text: #eef3f8;
  --muted: #96a5b6;
  --blue: #78a6ff;
  --red: #ff8b94;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 50% 15%, #1c2a3d 0, transparent 34rem),
    var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

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

.login-card {
  width: min(100%, 390px);
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: color-mix(in srgb, var(--panel) 96%, transparent);
  box-shadow: 0 24px 70px #0007;
}

h1 { margin: 0 0 2px; font-size: 25px; }
.login-hint { margin: 0 0 22px; color: var(--muted); }

.login-error {
  margin: 0 0 16px;
  padding: 9px 11px;
  border: 1px solid #663139;
  border-radius: 7px;
  background: #2d171b;
  color: var(--red);
}

form { display: grid; gap: 8px; }
label { margin-top: 7px; font-size: 13px; font-weight: 700; }

input {
  width: 100%;
  padding: 10px 11px;
  border: 1px solid var(--line);
  border-radius: 7px;
  outline: none;
  background: #0e141c;
  color: var(--text);
  font: inherit;
}

input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px #78a6ff24; }

button {
  margin-top: 16px;
  padding: 10px 12px;
  border: 1px solid #547fc8;
  border-radius: 7px;
  background: #315b9e;
  color: white;
  cursor: pointer;
  font: inherit;
  font-weight: 800;
}

button:hover { background: #3b69ae; }
button:focus-visible { outline: 2px solid #b8d0ff; outline-offset: 2px; }

@media (max-width: 460px) {
  .login-shell { padding: 15px; }
  .login-card { padding: 24px 20px; }
}