/* header */
header {
    display: flex;
    justify-content: space-between;
    background-color: #142164;
    color: #ffffff;
    padding: 10px 10%;
}
header img {
    width: 150px;
    margin-top: 10px;
    margin-right: 10px;
}
header nav {
    display: inline-block;
}
@media (max-width: 1100px) {
    header {
        display: block;
        padding: 10px 5%;
    }

    header nav {
        display: block;
    }
}
@media (max-width: 700px) {
    header nav {
        display: none;
    }
}

/* nav(header) */
.nav-links li {
    display: inline-block;
    font-size: 0.8em;
    padding: 10px;
}
.nav-links li:hover {
    background-color: #22327e;
    border-radius: 5px;
}
.nav-links .eng {
    font-size: 0.7em;
    display: block;
    margin-top: 2px;
}

/* humberger-menu-btn */
.menu-btn {
    font-size: 1.3em;
    padding: 13px 20px;
    /* background-color: #0A0908; */
    background-color: rgba(10, 9, 8, 0.9);
    color: #F2F4F3;
    cursor: pointer;
    position: fixed;
    top: 0px;
    right: 0px;
    z-index: 990;
    display: flex;
    flex-direction: column;
    align-items: center;
}
@media (min-width: 1000px) {
    .menu-btn {
        display: none;
    }
}
.menu-btn::after {
    content: "menu";
    font-size: 12px;
}

/* humberger-menu */
.side-nav {
    background-color: rgba(10, 9, 8, 0.8);
    height: 100%;
    width: 250px;
    position: fixed;
    top: 0;
    right: -250px;
    padding-top: 60px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    overflow-y: auto;
    /* transition: all 800ms ease-in-out; */
    /* ベジェ曲線 */
    transition: all 800ms cubic-bezier(.8, 0, .33, 1);
}
.side-nav::-webkit-scrollbar {
    display: none;
}
.side-nav.open {
    transform: translateX(-250px);
}
.side-nav a {
    padding: 10px 15px;
    color: #F2F4F3;
    display: block;
    transition: 0.3s;
}
.side-nav a:hover {
    background-color: #575757;
}
.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 1.5em;
    color: white;
    cursor: pointer;
}

/* banner */
.banner a {
    padding: 1px 2%;
    text-align: center;
}
.banner img {
    width: 200px;
    height: auto;
}

/* PCnav */
#PCnav {
    color: #e3ebff;
    background-color: #04104b;
    width: clamp(200px, 25vw, 300px);
    min-width: 200px;
    padding: 10px 20px;
    margin-right: 30px;
}
@media (max-width: 1000px) {
    #PCnav {
        display: none;
    }
}
#PCnav .eng {
    font-size: 0.8em;
}
#PCnav li {
    padding: 0 10px;
    border-left: #5e7ed5 solid 3px;
    margin-bottom: 10px;
}
#PCnav li:hover {
    color: rgb(255, 200, 70);
    border-left: rgb(255, 200, 70) solid 10px;
    border-bottom: rgb(255, 200, 70) solid 1px;
    transition: 0.3s ease;
}
#PCnav ul ul li {
    font-size: 0.9rem;
    margin-left: 40px;
    margin-bottom: 7px;
    border-left: none;
    list-style-type: circle;
}
#PCnav ul ul li:hover{
    border: none;
    list-style-type: square;
    transform: translateX(0.1rem);
    transition: 0.3s ease;
}
.fitmenu {
    position: sticky;
    top: 0;
    height: 100vh;
    align-self: flex-start;
}