*{
    box-sizing: border-box;
}

body{
    margin: 0 auto;
    color: #3f464d;
    font-family: 'Spoqa Han Sans Neo', 'Sans-serif'; 
}
/* 태블릿 화면 (최대 너비 768px) */
@media only screen and (max-width: 768px) {
    body {
        font-size: 14px;
        margin: 10px;
    }
}

/* 모바일 화면 (최대 너비 480px) */
@media only screen and (max-width: 480px) {
    body {
        font-size: 12px;
        margin: 5px;
    }
}

a {
    all: unset;
}

a:link {
    text-decoration: none;
    color: #3f464d;
}

a:visited {
    text-decoration: none;
    color: #3f464d;
}

a:active {
    text-decoration: none;
    color: #3f464d;
  }

a:hover{
    text-decoration: none;
    color: #3f464d;
}

.inner{
    width:100%;
    height:100%;
    margin: 0 auto;
    padding: 2em 2rem;
    overflow: hidden;
}

header{
    width: 100%;
    height:60px;
    background-color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000; 
}

.head-container{
    width: 100%;
    height:100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.head-container .head-brand {
    font-weight: bold;
    font-size: 1.2rem;
  }
  
  .head-container .head-brand a:hover {
    color: #2186c4;
    cursor: pointer;
  }
  
  /* 필요시 세부 설정을 위해, 상단 우측 메뉴만을 별도로 클래스로 정의 */
  .head-container .head-blog {
    font-weight: bold;
    font-size: 1.2rem;
  }
  
  .head-container .head-blog a:hover {
    color: #2186c4; 
    cursor: pointer;
  }
section{
    width: 100%;
    background-color: #fff;
    position: relative;
}


.main{
    height: 360px;
    background-image: url("https://media-cdn.tripadvisor.com/media/photo-s/17/aa/5c/77/201812.jpg");
    background-size: cover;
    background-position: center 30%; /* 이미지 위치를 살짝 위로 올리기 위한 position 설정 */
    background-repeat: no-repeat;
    z-index: 1;
}

.main-container{
    width: 100%;
    height: 100%;
    background-color: rgb(47, 48, 69);
    opacity: 0.8;
    z-index: 2;
    margin-top: 60px;
}

.title-container{
    padding-top: 50px;
    padding-bottom: 100px;
}

.title{
    font-size: 2rem;
    font-weight: bold;
    color: #fff;
    margin-bottom: 1em;
    z-index: 2;
    padding-left: auto ;
}
.message{
    font-size: 1rem;
    font-weight: normal;
    color: #fff;
    line-height: 2.5rem;
    z-index: 2;
}

.skill-container{
    width: 100%;
    height:100%;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.skill{
    width: 25%;
    background-color: #fff;
    display: flex;
    align-items: center;
    border-radius: 9px;
    padding: 0.5rem 1rem;
    margin: 0 1rem;
    box-shadow: 10px 10px 10px -5px rgba(25, 42, 70, 0.2);
}

.skill-name:hover{
    color: #0b77e4;
}

.skill:hover {
    box-shadow: 10px 10px 10px 0px rgba(25, 42, 70, 0.2);
    transform: translate(0, -5px);
    transition-duration: 1s;
    cursor: pointer;
  }

.skill-icon{
    font-size:2.5rem;
    margin: 10px;
    
}

.python-style{
    color:#2186c4;

}

.analysis-style{
    color:#ff8096;
}

.ai-style {
    color: #0bdc6d;
  }
  
.js-style {
    color: #f7df1e;
  }

.skill-title{
    display: flex;
    flex-direction: column;
    align-content: center;
}

.skill-name{
    font-weight: bold;
    color: #545e6f;
    margin-bottom: 0.2rem;
}

.skll-usage{
    font-size:0.9rem;
    color: #545e6f;
}

.roadmap-container{
    width: 100%;
    margin-top: 2rem;
}

.roadmap-title-container{
    width: 100%;
    display: flex;
    padding: 0.5rem 1rem;
    margin: 0 2.2rem;
    justify-content: space-between;
    align-items: center;
}

.roadmap-title{
    font-size: 1.3rem;
    font-weight: bold;
    color: #54536f;
}

.slide-prev {
    font-size: 2rem;
    cursor: pointer;
    color: rgb(47, 48, 89);
  }
  
  .slide-next {
    font-size: 2rem;
    cursor: pointer;
    color: #cfd8dc;
  }

.arrow-container{
    display: flex;
}

.class-list{
    display: flex;
    list-style: none;
    padding: 32px;
}

.class-card{
    width: 240px;
    box-shadow: 10px 10px 10px -5px rgba(25, 42, 70, 0.2);
    border-radius: 8px ;
    margin: 0 10px;
    
}

.class-card:hover {
    box-shadow: 10px 10px 10px 0px rgba(25, 42, 70, 0.2);
    transform: translate(0, -5px);
    transition-duration: 1s;
  }

.class-image{
    max-width: 240px;
     /* border-radius: 블럭 모서리를 둥글게 하는 CSS 기능
     top-left | top-right | bottom-right | bottom-left */
    border-radius: 8px 8px 0 0;
    box-shadow: 10px 10px 10px -5px rgba(25, 42, 70, 0.2);
}

.class-image:hover{
    cursor: pointer;
}


.class-container{
    width:100%;
    padding: 0.5rem 1rem 1rem 1rem;
    cursor: pointer;
}

.class-skill{
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.class-type{
    font-size: 0.9rem;
    color: #949393;

}
.class-format{
    font-size: 0.9rem;
    color: #fff;
    background-color: #0d47a1;
    padding: 0.2rem;
}
.class-title{
    font-weight: bold;
    font-size:1rem;
    color: #000;
    padding-top:1rem;

}

.class-title:hover{
    text-decoration: none;
    color: #0b77e4;
}

.class-detail{
    font-size: 0.8rem;
    line-height: 1.3rem;
    color:#c1c6cb;
    padding-top: 0.8rem;
}

#backtotop{
    background-color: rgb(47,48,49);
    width: 40px;
    height:40px;
    text-align: center;

    border-radius: 20px;
    position: fixed;
    bottom: 30px;
    right:30px;
    transition-property: background-color, opacity, visibility;
    transition-duration: 0.3s, 0.5s, 0.5s;
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

/* 아이콘 적용방법
    1. ::after (요소 뒤에 content 추가) 가상 요소에서,
    2. content: "fontawsome"유니코드 넣고,
    3. font-family: FontAwesome 이라고 넣으면 됨.
*/
#backtotop::after{
    content: "\f077";
    font-family: FontAwesome;
    font-size:  1.5rem;
    line-height: 40px;
    color: #fff;
}

#backtotop.show{
    opacity: 1;
    visibility: visible;
    background-color: rgb(47,48,49);
}

#backtotop.show:hover{
    cursor: pointer;
    background-color: #2186c4;

}


@media only screen and (min-width:1200px){
    .inner{
        max-width: 1200px;
    }
}

@media only screen and (max-width:980px){
    .skill-container{
        display: none;
    }
}

/* Mobile styles */
@media only screen and (min-width:200px) and (max-width:480px) {
    @media (max-width: 768px) {
        .title {
            font-size: 1.5rem !important;
        }
    }
    /* Adjust header */

    .title-container{       
        margin-top: 0.5px;
        padding-bottom: 100px;
        margin-right:auto;

    }

    .head-container{
        justify-content: space-between;
    }
    .inner{
        align-items: center;
        font-size: 0.85rem;
        padding:20px;
    }

    .skill{
        width:24rem;
        display: center;
    }

    .roadmap-title{
        align-items: center;
    }

    .arrow-container{
        visibility: hidden;
    }

    .head-container{
        width: 100%;
        height:100%;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .head-brand, .head-blog {
        margin-bottom: 10px;
    }
  
    /* Main image section */
    .main-container{
        padding: 10px;
        text-align: center;
    }

    .main-container .title {
        font-size: 1.8rem;
    }

    .message {
        font-size: 0.7rem;
        padding: 10px;
    }

    .class-image{
        max-width: 100%;
         /* border-radius: 블럭 모서리를 둥글게 하는 CSS 기능
         top-left | top-right | bottom-right | bottom-left */
        border-radius: 8px 8px 0 0;
        box-shadow: 10px 10px 10px -5px rgba(25, 42, 70, 0.2);
    }
    

    /* Skills section */
    .skill-container {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .skill {
        margin-bottom: 20px;
        text-align: center;
    }

    /* Roadmap section */
    .roadmap-container {
        text-align: center;
    }

    .roadmap-title-container {
        flex-direction: column;
        align-items: center;
        margin-left: 0px;
    }

    .class-list {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .class-card {
        width: 90%;
        margin-bottom: 20px;
    }

    /* Footer */
    footer {
        text-align: center;
    }
}

footer {
    background-color: #f8f9fa;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-container {
    text-align: center;
}

.social-links {
    margin-bottom: 1rem;
}

.social-links a {
    color: #333;
    font-size: 1.5rem;
    margin: 0 1rem;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: #007bff;
}

.copyright {
    color: #6c757d;
    font-size: 0.9rem;
    margin: 0;
}

/* 각 아이콘별 호버 효과 */
.social-links a:hover .fa-github {
    color: #333;
}

.social-links a:hover .fa-instagram {
    color: #e1306c;
}

.social-links a:hover .fa-blog {
    color: #2ecc71;
}

.social-links a:hover .fa-pencil-alt {
    color: #f05228;  /* 티스토리 브랜드 색상 */
}