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:root {
    --htmlColor : #223547;
    --cssColor : #472222;
    --javascriptColor : #224736;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'NexonLv1Gothic';
    color: var(--htmlColor);
}
*, *:before, *:after {
    box-sizing:border-box;
}
a {
    color: var(--htmlColor);
    text-decoration: none;
}
li {
    list-style: none;
}
/* scroll */
::-webkit-scrollbar-track
{
	box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
	border-radius: 10px;
	background-color: #F5F5F5;
}

::-webkit-scrollbar
{
	width: 10px;
	background-color: #F5F5F5;
    height: 10px;
}

::-webkit-scrollbar-thumb
{
	border-radius: 10px;
	box-shadow: inset 0 0 6px rgba(0,0,0,.3);
	background-color: #282936;
}
::-webkit-scrollbar-thumb:hover {
    background-color: #0f1891a7;

}

/* header */
#header {
    display: flex;
    justify-content: space-between;
}
#header nav {
    margin: 10px;
}
#header nav li {
    position: relative;
    display: inline;
}
#header nav li a {
    width: 30px;
    height: 30px;
    border: 1px solid var(--htmlColor);
    border-radius: 50%;
    display: inline-block;
    text-align: center;
    line-height: 30px;
    font-family: 'NexonLv1Gothic';
}
#header nav li.active a {
    background-color: var(--htmlColor);
    color: #fff;
}
#header nav li .sub {
    position: absolute;
    left: 0;
    top: 35px;
    width: 400px;
}
#header nav li .sub li a {
    width: auto;
    background-color: transparent;
    color: var(--htmlColor);
    border: 0;
    text-align: left;
    line-height: 1.2;
}
#header nav li .sub li.active a {
    text-decoration: underline;
}

/* main */
#main {
    margin: 50px 10px;
}
.search__wrap {
    max-width: 1400px;
    margin: 0 auto;
    border: 3px solid var(--htmlColor);
    border-radius: 20px;
    background-color: #f1f3f6;
    padding: 30px;
    text-align: center;
}
.search__wrap > span {
    font-size: 20px;
    margin-bottom: 20px;
    display: inline-block;
}
.search__wrap > h1 {
    font-family: 'Tmon';
    color: var(--htmlColor);
    font-size: 6vw;
    margin-bottom: 10px;
}
.search__box {
    margin-bottom: 20px;
}
.search__box label {
    position: absolute;
    clip: rect(0 0 0 0);
    width: 1px;
    height: 1px;
    margin: -1px;
    overflow: hidden;
}
.search__box input {
    border: 2px solid var(--htmlColor);
    padding: 15px 40px;
    width: 70%;
    border-radius: 50px;
    font-size: 20px;
}
.search__list li {
    text-align: left;
    line-height: 1.7;
}
.search__list li.hide {
    display: none;
}
.search__list li.show {
    display: block;
}

.search__info {
    text-align: right;
    margin-bottom: 30px;
    padding-bottom: 10px;
    border-bottom: 2px dashed var(--htmlColor);
}
.search__info {
    text-align: center;
    margin-bottom: 10px;
}
/* keyword box */
.search__info .keyword {
    text-align: center;
    margin-bottom: 10px;
}
.search__info .keyword span {
    border: 2px solid var(--htmlColor);
    border-radius: 50px;
    padding: 10px;
    display: inline-block;
    margin-bottom: 4px;
}
.search__info .keyword span:hover {
    background-color: var(--htmlColor);
    cursor: pointer;
    color: #fff;
} 

@media (max-width: 600px){
    .search__wrap {
        padding: 20px;
    }
    .search__wrap > span {
        font-size: 16px;
        margin-bottom: 10px;
    }
    .search__wrap > h1 {
        font-size: 44px;
    }
    .search__box input {
        font-size: 16px;
        padding: 12px 30px;
    }
}

/* modal__wrap */
.modal__wrap {}
.modal__cont {
    width: 100%;
    height: 100vh;
    background-color: rgba(255, 255, 255, 0.3);
    position: fixed;
    left: 0;
    top: 0;
    overflow-x: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: scale(0);
}
.modal__btn {
    color: #000;
    border: 1px solid rgb(177, 12, 12);
    border-radius: 50px;
    display: inline-block;
    padding: 10px 20px;
    position: absolute;
    right: 0px;
    top: 20px;
    cursor: pointer;
    transition: all 0.3s;
}
.modal__btn:hover {
    background-color: rgb(0, 255, 42);
    color: #3B3D63;
}
.modal__box {
    width: 70%;
    height: 70vh;
    margin: 0 auto;
    background-color: #fff;
    background-color: #fff;
    border-radius: 0.5rem;
    box-shadow: 0 10px 20px -5px hsl(180deg 2% 10%);
    transform: scale(0);
  
}
.modal__box .title {
    padding-inline: 1rem;
    background-color: #000007;
    display: flex;
    align-items: center;
    color: #fff;
    height: 50px;
    border-top-left-radius: 0.5rem;
    border-top-right-radius: 0.5rem;
}
.modal__box .title .dot {
    width: 15px;
    height: 15px;
    background-color: #fbff00;
    display: inline-block;
    border-radius: 50%;
    position: relative;
    margin-left: 2rem;
}
.modal__box .title .dot::before {
    content: '';
    position: absolute;
    left: 25px;
    top: 0;
    width: 15px;
    height: 15px;
    background-color: #22ff00;
    border-radius: 50%;
}
.modal__box .title .dot::after {
    content: '';
    position: absolute;
    right: 25px;
    top: 0;
    width: 15px;
    height: 15px;
    background-color: rgb(255, 0, 0);
    border-radius: 50%;
}
.modal__box .title .plus {
    background: #282936;
    padding: 0.5rem 0.5rem 0.3rem 0.5rem;
    border-radius: 0.5rem;
    color: #7A7D9D;
}
.modal__box .title .tabs {
    display: flex;
    margin-left: 50px;
}
.modal__box .title .tabs > div {
    color: #7A7D9D;
    background-color: #1f224a;
    padding: 0.35rem 0.8rem 0.25rem 0.8rem;
    margin-right: 0.5rem;
    display: flex;
    align-items: center;
    border-radius: 0.4rem;
    text-transform: uppercase;
    cursor: grab;
}
.modal__box .title .tabs > div.active {
    background-color: #fff;
}
.modal__box .title .tabs > div em {
    font-style: normal;
}
.modal__box .title .tabs > div .favicon {
    margin-right: 0.4rem;
    margin-top: 0.2rem;
}
.modal__box .title .tabs > div .close {
    margin-left: 4rem;
}
.title .plus {
    border: 1px solid #000;
    padding: 0.4rem;
    border-radius: 10px;
    background-color: #1f224a;
    color: #fff;
}
.modal__box .cont {
    background-color: #282936;
    height: 100%;
    box-sizing: border-box;
    border-bottom-left-radius: 0.5rem;
    border-bottom-right-radius: 0.5rem;
    overflow-y: auto;
}
.modal__box .cont > div{ 
    display: none;
}

.modal__box .cont > div.active {
    display: block;
    height: 100%;
}
.modal__close {
    position: absolute;
    right: 100px;
    top: 40px;
    background-color: #1f224a;
    padding: 1rem 1rem 0.8rem 1rem;
    border-radius: 5px;
    box-shadow: 0 3px 5px -5px hsl(180deg 2% 10%);
    cursor: pointer;
    transition: all 0.3s;
    opacity: 0;
}
.modal__close:hover{
    background-color: #13142d7d;
}
.modal__close svg{
    color: #fff;
}

/* 모달 애니메이션 */
.modal__cont.show { /*전체 배경*/
    animation: foldOut 1s ease forwards;
}

.modal__cont.show .modal__box {   /*스크립트 배경*/
    animation: zoomOut 0.5s 1s ease forwards; /*초를 두개써서딜레이를 줄 수 있다*/
}

.modal__cont.show .modal__close {    /* 닫기버튼*/
    animation: closeOut 0.6s 1.5s ease forwards;
}

.modal__cont.show.hide {  
    animation: foldIn 0.3s 0.3s ease backwards; 
}
.modal__cont.show.hide .modal__box{   
    animation: zoomIn 0.5s 1s ease backwards;
}
.modal__cont.show.hide .modal__close {    /* 닫기버튼*/
    animation: closeIn 0.3s 0.6s ease backwards;
    opacity: 1;
}

@keyframes foldOut {
    0% {transform: scaleX(0) scaleY(0.001);}
    50% {transform: scaleX(1) scaleY(0.001);}
    100% {transform: scaleX(1) scaleY(1);}
}
@keyframes closeOut {
    0% {opacity: 0;}
    100% {opacity: 1;}
}

@keyframes foldIn {
    0% {transform: scaleX(1) scaleY(1);}
    50% {transform: scaleX(1) scaleY(0.001);}
    100% {transform: scaleX(0) scaleY(0.001);}
}
@keyframes zoomOut {
    0% {transform: scale(0);}
    100% {transform: scale(1);}
}
@keyframes zoomIn {
    100% {transform: scale(1);}
    0% {transform: scale(0);}
}

@media (max-width: 1100px){
    #header {
        width: 100%;
    }
    .modal__box{
        width: 96%;
    }
    .modal__box .title {
        overflow: hidden;
    }
    .modal__box .title .dot {
        display: none;
    }
    .modal__box .title .tabs {
        margin-left: 0;
    }
    .modal__box .title .tabs > div .close {
        display: none;
    }
}
@media (max-width: 600px){
    #header {
        text-align: center;
    }
    #header h1{
        line-height: 1.4;
    }
    .modal__box{
        width: 96%;
    }
}

/* footer */
#footer {
    text-align: center;
}
#footer a {
    color: #000;
    font-family: 'NexonLv1Gothic';
    padding-bottom: 50px;
}
#footer a:hover {
    text-decoration: underline;
}

    <main id="main">
    <div class="search__wrap">
        <span>charAt()를 이용하여 검색하기</span>
        <h1>CSS 속성 검색하기</h1>

        <div class="search__info">
            <div class="keyword">
                <span>a</span>
                <span>b</span>
                <span>c</span>
                <span>d</span>
                <span>e</span>
                <span>f</span>
                <span>g</span>
                <span>h</span>
                <span>i</span>
                <span>j</span>
                <span>k</span>
                <span>l</span>
                <span>m</span>
                <span>n</span>
                <span>o</span>
                <span>p</span>
                <span>q</span>
                <span>r</span>
                <span>s</span>
                <span>t</span>
                <span>u</span>
                <span>v</span>
                <span>w</span>
                <span>x</span>
                <span>y</span>
                <span>z</span>
            </div>
            <div>전체 속성 갯수 : <span class="num"></span></div>
            <div>목록 속성 갯수 : <span class="subnum"></span></div>
        </div>
        <div class="search__list">
            <div class="css">
                <ul>
                    <li><strong>accent-color</strong> : 특정 요소에 색상을 지정할 때 사용됩니다.</li>
                        <li><strong>align-content</strong> : 콘텐츠 아이템의 상하관계 정렬 상태를 설정합니다.</li>
                        <li><strong>align-items</strong> : 콘텐츠 아이템의 내부 상하관계 정렬 상태를 설정합니다.</li>
                        <li><strong>align-self</strong> : 개별적인 콘텐츠 아이템의 정렬 상태를 설정합니다.</li>
                        <li><strong>all</strong> : 요소의 속성을 초기화 또는 상속을 설정합니다.</li>
                        <li><strong>animation</strong> : 애니메이션과 관련된 속성을 일괄적으로 설정합니다.</li>
                        <li><strong>animation-delay</strong> : 애니메이션 지연 시간을 설정합니다.</li>
                        <li><strong>animation-direction</strong> : 애니메이션 움직임 방향을 설정합니다.</li>
                </ul>
            </div>
        </div>
    </div>
</main>
filter()를 이용하여 속성의 중요도 보여주기

CSS 속성 검색하기

전체 속성 갯수 : 0