:root {
      --mca-primary: #2563eb;
      --mca-dark:    #0f172a;
      --mca-surface: #1e293b;
      --mca-border:  #334155;
      --mca-text:    #f1f5f9;
      --mca-muted:   #94a3b8;
    }

    body {
      background: var(--mca-dark);
      color: var(--mca-text);
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: 'Inter', system-ui, sans-serif;
    }

    .login-card {
      background: var(--mca-surface);
      border: 1px solid var(--mca-border);
      border-radius: 12px;
      padding: 2.5rem;
      width: 100%;
      max-width: 420px;
    }

    .login-logo {
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--mca-text);
    }

    .login-logo span {
      color: var(--mca-primary);
    }

    .login-subtitle {
      color: var(--mca-muted);
      font-size: 0.875rem;
      margin-top: 0.25rem;
    }

    .form-label {
      color: var(--mca-muted);
      font-size: 0.8125rem;
      font-weight: 500;
      margin-bottom: 0.4rem;
    }

    .form-control {
      background: var(--mca-dark);
      border: 1px solid var(--mca-border);
      color: var(--mca-text);
      border-radius: 8px;
      padding: 0.65rem 1rem;
      transition: border-color 0.15s;
    }

    .form-control:focus {
      background: var(--mca-dark);
      border-color: var(--mca-primary);
      color: var(--mca-text);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

    .form-control::placeholder {
      color: #475569;
    }

    .btn-login {
      background: var(--mca-primary);
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 0.7rem;
      border-radius: 8px;
      transition: background 0.15s, transform 0.1s;
      width: 100%;
    }

    .btn-login:hover:not(:disabled) {
      background: #1d4ed8;
    }

    .btn-login:active:not(:disabled) {
      transform: scale(0.98);
    }

    .btn-login:disabled {
      opacity: 0.7;
      cursor: not-allowed;
    }

    .alert-error {
      background: rgba(239, 68, 68, 0.12);
      border: 1px solid rgba(239, 68, 68, 0.3);
      color: #fca5a5;
      border-radius: 8px;
      padding: 0.75rem 1rem;
      font-size: 0.875rem;
      display: none;
    }

    .divider {
      border-top: 1px solid var(--mca-border);
      margin: 1.5rem 0;
    }

    .footer-text {
      color: var(--mca-muted);
      font-size: 0.75rem;
      text-align: center;
    }