:root {
  --bg: #040b16;
  --panel: #0f172a;
  --accent: #38bdf8;
  --accent-strong: #22d3ee;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --danger: #f87171;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.25), transparent 40%), var(--bg);
  color: var(--text);
}

.auth-shell {
  width: min(420px, 100%);
  padding: 16px;
}

.login-panel {
  background: rgba(15, 23, 42, 0.95);
  border-radius: 18px;
  padding: 26px;
  box-shadow: 0 24px 60px rgba(2, 6, 23, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.logo {
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-align: center;
}

h1 {
  margin: 10px 0 4px;
  text-align: center;
  font-size: 24px;
  color: #e0f2fe;
}

p {
  margin: 0 0 18px;
  text-align: center;
  color: var(--muted);
}

form {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  font-weight: 600;
  color: var(--text);
}

input {
  padding: 12px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  font-size: 15px;
  background: rgba(255,255,255,0.02);
  color: var(--text);
}

.primary {
  border: none;
  border-radius: 12px;
  padding: 12px 16px;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #021129;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.2s ease;
  box-shadow: 0 12px 28px rgba(34, 211, 238, 0.3);
}

.primary:hover {
  filter: brightness(1.05);
}

#login-error {
  min-height: 20px;
  color: var(--danger);
  font-size: 14px;
  text-align: center;
}