body {
  margin: 0;
  font-family: "Noto Sans TC", sans-serif;
  background-color: #f5f5f5;
}

.signup-form {
  max-width: 400px;
  margin: 60px auto;
  background: #f8fafc;
  padding: 32px 32px 24px 32px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(44, 62, 80, 0.07);
}

.signup-form h2 {
  text-align: center;
  margin-bottom: 24px;
  color: #2c3e50;
  font-size: 24px;
  letter-spacing: 2px;
}

.signup-form label {
  display: block;
  margin-bottom: 8px;
  color: #2c3e50;
  font-weight: 500;
  font-size: 15px;
}

.signup-form input[type="email"],
.signup-form input[type="password"],
.signup-form input[type="text"] {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 15px;
  margin-bottom: 18px;
  background: #fff;
  box-sizing: border-box;
}

.signup-form button {
  width: 100%;
  padding: 10px 0;
  background: #2c3e50;
  color: #fff;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  letter-spacing: 2px;
  cursor: pointer;
  transition: background 0.2s;
}

.signup-form button:hover {
  background: #1a242f;
}

.signup-form .message {
  text-align: center;
  color: #e67e22;
  margin-top: 15px;
  font-size: 15px;
}

.message.success {
  color: green;
}

.message.error {
  color: red;
}

.signup-form .signup-link {
  display: block;
  text-align: center;
  margin-top: 18px;
  color: #2c3e50;
  text-decoration: underline;
  font-size: 15px;
}

.input-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.input-group input[type="password"],
.input-group input[type="text"] {
  flex: 1;
}

#match-icon,
#password-match-icon {
  font-size: 18px;
  color: green;
  display: none;
}

#password-rule-message {
  font-size: 13px;
  color: red;
  margin-top: -14px;
  margin-bottom: 12px;
  display: none;
}

.show-password {
  display: flex;
  align-items: center;
  font-size: 14px;
  margin-top: -8px;
  margin-bottom: 16px;
  color: #2c3e50;
}

.show-password input[type="checkbox"] {
  margin-right: 6px;
}

.flash-message.success {
  background: #d4edda;
  color: #155724;
  padding: 12px;
  border-radius: 4px;
  margin-bottom: 10px;
  border: 1px solid #c3e6cb;
}

.flash-message.danger {
  background: #f8d7da;
  color: #721c24;
  padding: 12px;
  border-radius: 4px;
  margin-bottom: 10px;
  border: 1px solid #f5c6cb;
}

.recaptcha-wrapper {
  background: #f4f4f4;
  padding: 16px;
  border-radius: 8px;
  border: 1px solid #ccc;
  max-width: 400px;
  width: 100%;
  margin: 0 auto 18px auto;
  box-sizing: border-box;
}

.recaptcha-label {
  display: block;
  font-size: 14px;
  margin-bottom: 8px;
  color: #444;
}
.recaptcha-wrapper .g-recaptcha {
  margin: 0 auto;
  transform: scale(1);
  transform-origin: 0 0;
}
.recaptcha-wrapper .g-recaptcha {
  transform: scale(0.85) translateX(-10px);
  transform-origin: top left;
}