:root {
  --bg-dark: #121212;
  --card-dark: #1E1E1E;
  --text-white: #FFFFFF;
  --text-secondary: #f6f5f5;
  --accent-green: #B9FF2B;
  --link-green: #7CFC00;
}

body {
  background: var(--bg-dark);
  color: var(--text-white);
  font-family: 'Open Sans', sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-card {
  background: var(--card-dark);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 8px 20px rgba(0,0,0,0.4);
  width: 100%;
  max-width: 420px;
  animation: fadeIn 0.6s ease;
  text-align: center;
}

.logo-img {
  max-width: 220px;
  margin-bottom: 1.5rem;
}

.brand-name {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--accent-green);
}

.form-label {
  font-weight: 600;
  margin-bottom: 0.5rem;
  text-align: left;
}

.form-control {
  background: #2a2a2a;
  border: 1px solid #333;
  color: var(--text-white);
  border-radius: 0.5rem;
  padding: 0.9rem 1rem;
}

.form-control:focus {
  border-color: var(--accent-green);
  background: #333;
  outline: none;
  box-shadow: none;
  color: var(--text-white);
}

.btn-login {
  background: var(--accent-green);
  border: none;
  color: #121212;
  font-weight: 700;
  padding: 0.9rem;
  border-radius: 0.5rem;
  width: 100%;
  transition: all 0.3s ease;
}

.btn-login:hover {
  background: #aaff33;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(185,255,43,0.3);
}

.error-message {
  background: rgba(255,71,87,0.1);
  border: 1px solid rgba(255,71,87,0.3);
  color: #ff4757;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}