:root {
  --primary-color: #0d6efd;
  --main-bg-color: #f0f2f5;
}
body {
  background-color: #f0f2f5;
  font-family: 'Noto Sans TC', sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-container {
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  width: 100%;
  max-width: 400px;
}
.login-header {
  text-align: center;
  margin-bottom: 2rem;
}
.login-header h3 {
  color: #0d6efd;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.login-header .subtitle {
  color: #6c757d;
  font-size: 0.9rem;
}
button {
  border: 0px none;
  background-color: transparent;
}
.form-control {
  border-radius: 8px;
  border: 1px solid #dee2e6;
  padding: 0.75rem 1rem;
  font-size: 1rem;
}
.form-control:focus {
  border-color: #0d6efd;
  box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}
.btn-login {
  background-color: #0d6efd;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-weight: 500;
  width: 100%;
  font-size: 1rem;
}
.btn-login:hover {
  background-color: #0b5ed7;
}
.captcha-container {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}
.captcha-image {
  border: 1px solid #dee2e6;
  border-radius: 4px;
  cursor: pointer;
}
.captcha-image:hover {
  opacity: 0.8;
}
.password-toggle {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  background: none;
  color: #6c757d;
  cursor: pointer;
}
.password-container {
  position: relative;
}
.alert {
  border-radius: 8px;
  border: none;
}
.form-label {
  font-weight: 500;
  color: #495057;
  margin-bottom: 0.5rem;
}
.mb-3 {
  margin-bottom: 1.5rem !important;
}