:root {
  --bg: radial-gradient(circle at 20% 20%, rgba(59,130,246,0.08), rgba(37,99,235,0.03)), #0c1220;
  --card: #111a2b;
  --border: #1f2e46;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --primary: #3b82f6;
  --primary-strong: #2563eb;
  --shadow: 0 25px 60px rgba(0,0,0,0.55);
  --error: #ef4444;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: grid;
  place-items: center;
}
.login-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  width: min(420px, 90vw);
  padding: 2rem 2.4rem;
  text-align: center;
}
.login-card h2 { margin-bottom: 0.35rem; }
.login-subtitle { color: var(--muted); margin-bottom: 1.4rem; }
.mfa-prompt { 
  color: var(--muted); 
  margin-bottom: 1.2rem; 
  text-align: left;
  font-size: 0.95rem;
}
.form-group {
  margin-bottom: 1.2rem;
  text-align: left;
}
.form-group label {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--text);
  font-weight: 600;
  font-size: 0.9rem;
}
.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.3);
  color: var(--text);
  font-family: 'Inter', 'Segoe UI', sans-serif;
  font-size: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}
.form-group input::placeholder {
  color: var(--muted);
  opacity: 0.5;
}
.error-message {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--error);
  padding: 0.75rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  text-align: left;
}
.btn {
  width: 100%;
  border: none;
  border-radius: 10px;
  padding: 0.8rem 1rem;
  font-weight: 700;
  cursor: pointer;
  background: linear-gradient(135deg, var(--primary), var(--primary-strong));
  color: #0b1220;
  box-shadow: 0 10px 30px rgba(37,99,235,0.35);
  transition: transform 0.1s ease, opacity 0.2s ease;
  font-size: 1rem;
  font-family: 'Inter', 'Segoe UI', sans-serif;
}
.btn:hover:not(:disabled) { 
  transform: translateY(-1px); 
}
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  box-shadow: none;
  margin-top: 0.75rem;
  border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.08);
}
.login-footer {
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}