body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f5f5f5;
  line-height: 1.6;
  color: #333;
}

.container {
  width: 80%;
  margin: 20px auto;
  background: #fff;
  padding: 20px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px 0 20px;
  color: #fff;
  border-bottom: 3px solid #002366;
}

.header-right {
  display: flex;
  align-items: center;
}

.logo img {
  max-height: 50px;
}

.title h1 {
  margin: 0;
  font-size: 30px;
  font-weight: bold;
  text-align: center;
  margin-right: 10px;
}

.language-switch {
  font-size: 18px;
  margin-left: auto;
  color: #004aad;
}

.language-switch a {
  text-decoration: none;
  color: #004aad;
  font-weight: bold;
  margin: 0 5px;
}

.language-switch a:hover {
  text-decoration: underline;
}

.security-info {
  padding: 15px;
}

.security-info h2 {
  margin: 0 0 10px;
  font-size: 20px;
  color: #003366;
}

.security-info .english {
  font-size: 16px;
  color: #666;
}

.security-info ul {
  margin: 0;
  padding-left: 28px;
  list-style-type: disc;
}

.security-info li {
  font-size: 16px;
  margin-bottom: 8px;
}

.security-info strong {
  color: #ff0000;
}


.installation-guide {
  max-width: 100%;
  padding: 20px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

h1 {
  text-align: center;
  color: #002366;
}

.steps {
  margin: 20px 0;
}

.step {
  display: flex;
  align-items: flex-start;
  margin: 20px 0;
  position: relative;
}

.step-number {
  font-size: 18px;
  font-weight: bold;
  background-color: #003366;
  color: #fff;
  border-radius: 50px;
  width: 150px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 10px;
  position: relative;
}

.step-number.english{
  font-size: 18px;
  font-weight: bold;
  background-color: #003366;
  color: #fff;
  border-radius: 50px;
  width: 192px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 10px;
  position: relative;
}

.login-step {
  text-align: left;
  justify-content: flex-start; 
  padding-left: 40px;
}

.login-step.english{
  text-align: left; 
  justify-content: flex-start; 
  padding-left: 20px; 
}

.installation-title {
  font-size: 22px;
  font-weight: bold;
  margin-left: 47px;
  color: #003366;
}

.installation-title.english{
  font-size: 22px;
  font-weight: bold;
  margin-left: 17px;
  color: #003366;
}

.step-number.has-line::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 100%;
  width: 109px; 
  border-top: 4px dotted #003366; 
  transform: translateY(-50%);
}

.step-info {
  flex: 1;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-left: 100px;
  background: #f9f9f9;
  padding: 10px;
  border: 2px solid #ddd;
  border-radius: 8px;
}

.step-info.warning {
   border: 5px solid #ff9800;
   background: #ffeb3b;
}

.step-info p {
  margin: 0;
}

.step-details {
  flex: 3;
}

.step.last {
  margin-top: 33px;
  margin-bottom: 0px;
}
  
.buttons {
  display: flex;
  flex: 1;
  justify-content: flex-end;
}

button {
  background: #002366;
  color: #fff;
  border: none;
  padding: 16px 12px;
  margin-left: 10px; 
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  width: 135px;
  font-weight: bold;
}

button:hover {
  background: #004aad;
}

a.button {
  background: #002366;
  color: #fff;
  border: none;
  padding: 12px 18px;
  margin-left: 10px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  font-weight: bold;
  width: 100px;
  text-decoration: none;
  text-align: center;
  display: inline-block;
}

a.button.english{
  padding: 12px 10px;
}

a.button:hover {
  background: #004aad;
}

.arrow {
  position: absolute;
  top: 80%;
  right: calc(100% - 110px);
  width: 0;
  height: 0;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-top: 20px solid #003366;
  transform: translateY(-50%);
}

.arrow.english {
  right: calc(100% - 124px);
}

.arrow_2.english {
  right: calc(100% - 124px);
}

.arrow_2 {
  position: absolute;
  top: 140%;
  right: calc(100% - 110px);
  width: 0;
  height: 0;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-top: 20px solid #003366;
  transform: translateY(-50%);
}

.nac-hint-box {
  position: absolute;
  bottom: calc(100% - 380px);
  left: calc(100% - 335px);
  width: 170px;
  background: #fff;
  border: 2px solid #003366;
  border-radius: 8px;
  font-size: 14px;
  color: #000;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  z-index: 10;
}

.nac-hint-box.english {
  position: absolute;
  bottom: calc(100% - 380px);
  left: calc(100% - 335px);
  width: 180px;
  background: #fff;
  border: 2px solid #003366;
  border-radius: 8px;
  font-size: 14px;
  color: #000;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  z-index: 10;
}

.nac-hint-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.nac-hint-content img {
  width: 100%;
  max-width: 160px;
}

.nac-hint-content p {
  margin: 0;
  font-weight: bold;
  text-align: center;
  font-size: 13px;
  color: #333;
  margin-top: 2px;
}

.nac-hint-content p img {
  width: 34px;
  vertical-align: middle;
  margin: -14px -10px -10px -10px;
}

.nac-hint-arrow {
  position: absolute;
  top: 100%;
  right: 74px;
  width: 0;
  height: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
  border-top: 12px solid #003366;
}

/* 반응형 디자인 적용 */
@media (max-width: 1351px) {
	.nac-hint-box {
		position: absolute;
		bottom: calc(100% - 380px);
		left: calc(100% - 200px);
		width: 170px;
		background: #fff;
		border: 2px solid #003366;
		border-radius: 8px;
		font-size: 14px;
		color: #000;
		box-shadow: 0 2px 6px rgba(0,0,0,0.2);
		z-index: 10;
	}
	
	.nac-hint-arrow {
		position: absolute;
		top: 100%;
		right: 147px;
		width: 0;
		height: 0;
		border-left: 10px solid transparent;
		border-right: 10px solid transparent;
		border-top: 12px solid #003366;
	}
}

@media (max-width: 1205px) {
  .header {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-right {
    width: 100%;
    justify-content: space-between;
    margin-top: 10px;
  }

  .title h1 {
    text-align: left;
  }
  
  .step {
    flex-direction: column;
	align-items: center;
	margin: 0px;
  }
  
  .step.last {
    margin-top: 0px;
	margin-bottom: 0px;"
  }

  .step-info {
    flex-direction: column;
    align-items: flex-start;
	margin: 10px 0px 0px 0px;
	text-align: left;
  }

  .buttons {
     justify-content: center;
    width: 100%;
    margin-top: 10px;
	
  }

  button {
    margin-left: 10px;
    margin-top: 10px;
  }
  
  a.button {
    background: #002366;
    color: #fff;
    border: none;
    padding: 12px 18px;
    margin-left: 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 15px;
    font-weight: bold;
    width: 60px;
    text-decoration: none;
    text-align: center;
    display: inline-block;
  }
  
  a.button.english{
    padding: 12px 18px;
  }

  .step-number.has-line::after {
    display: none;
  }
  
  .installation-title {
    text-align: center;
    margin-left: 0;
  }
  
  .arrow {
    position: static;
    margin: 20px 10px 0 0; 
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
    border-top: 20px solid #003366;
  }
  
  .arrow_2 {
    position: static;
    margin: 20px 10px 0 0;
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
    border-top: 20px solid #003366;
  }
  
  .nac-hint-box {
		position: absolute;
		bottom: calc(100% - 750px);
		left: calc(100% - 450px);
		width: 170px;
		background: #fff;
		border: 2px solid #003366;
		border-radius: 8px;
		font-size: 14px;
		color: #000;
		box-shadow: 0 2px 6px rgba(0,0,0,0.2);
		z-index: 10;
	}
	
	.nac-hint-arrow {
	  width: 0;
	  height: 0;
	  border-top: 10px solid transparent;
	  border-bottom: 10px solid transparent;
	  border-right: 12px solid #003366;
	  margin: -100px 23px 0 0;
	}
}


@media (max-width: 1124px) {
	.nac-hint-box {
		position: absolute;
		bottom: calc(100% - 810px);
		left: calc(100% - 350px);
		width: 170px;
		background: #fff;
		border: 2px solid #003366;
		border-radius: 8px;
		font-size: 14px;
		color: #000;
		box-shadow: 0 2px 6px rgba(0,0,0,0.2);
		z-index: 10;
	}
	
	.nac-hint-arrow {
	  width: 0;
	  height: 0;
	  border-top: 10px solid transparent;
	  border-bottom: 10px solid transparent;
	  border-right: 12px solid #003366;
	  margin: -100px 23px 0 0;
	}
}

@media (max-width: 900px) {
	.nac-hint-box {
		position: absolute;
		bottom: calc(100% - 810px);
		left: calc(100% - 300px);
		width: 170px;
		background: #fff;
		border: 2px solid #003366;
		border-radius: 8px;
		font-size: 14px;
		color: #000;
		box-shadow: 0 2px 6px rgba(0,0,0,0.2);
		z-index: 10;
	}
	
	.nac-hint-arrow {
	  width: 0;
	  height: 0;
	  border-top: 10px solid transparent;
	  border-bottom: 10px solid transparent;
	  border-right: 12px solid #003366;
	  margin: -100px 23px 0 0;
	}
}

@media (max-width: 712px) {
	.nac-hint-box {
		position: absolute;
		bottom: calc(100% - 810px);
		left: calc(100% - 180px);
		width: 170px;
		background: #fff;
		border: 2px solid #003366;
		border-radius: 8px;
		font-size: 14px;
		color: #000;
		box-shadow: 0 2px 6px rgba(0,0,0,0.2);
		z-index: 10;
	}
	
	.nac-hint-arrow {
	  width: 0;
	  height: 0;
	  border-top: 10px solid transparent;
	  border-bottom: 10px solid transparent;
	  border-right: 12px solid #003366;
	  margin: -100px 23px 0 0;
	}
}

@media (max-width: 700px) {
	.nac-hint-box {
		position: absolute;
		bottom: calc(100% - 880px);
		left: calc(100% - 230px);
		width: 170px;
		background: #fff;
		border: 2px solid #003366;
		border-radius: 8px;
		font-size: 14px;
		color: #000;
		box-shadow: 0 2px 6px rgba(0,0,0,0.2);
		z-index: 10;
	}
	
	.nac-hint-arrow {
	  width: 0;
	  height: 0;
	  border-top: 10px solid transparent;
	  border-bottom: 10px solid transparent;
	  border-right: 12px solid #003366;
	  margin: -100px 23px 0 0;
	}
}

@media (max-width: 598px) {
	.nac-hint-box {
		position: absolute;
		bottom: calc(100% - 920px);
		left: calc(100% - 180px);
		width: 170px;
		background: #fff;
		border: 2px solid #003366;
		border-radius: 8px;
		font-size: 14px;
		color: #000;
		box-shadow: 0 2px 6px rgba(0,0,0,0.2);
		z-index: 10;
	}
	
	.nac-hint-arrow {
	  width: 0;
	  height: 0;
	  border-top: 10px solid transparent;
	  border-bottom: 10px solid transparent;
	  border-right: 12px solid #003366;
	  margin: -100px 23px 0 0;
	}
}

@media (max-width: 508px) {
	.nac-hint-box {
		position: absolute;
		bottom: calc(100% - 950px);
		left: calc(100% - 180px);
		width: 170px;
		background: #fff;
		border: 2px solid #003366;
		border-radius: 8px;
		font-size: 14px;
		color: #000;
		box-shadow: 0 2px 6px rgba(0,0,0,0.2);
		z-index: 10;
	}
	
	.nac-hint-arrow {
	  width: 0;
	  height: 0;
	  border-top: 10px solid transparent;
	  border-bottom: 10px solid transparent;
	  border-right: 12px solid #003366;
	  margin: -72px 23px 0 0;
	}
}