html {
    scroll-behavior: smooth;
}

html body{
    margin:0;
    padding:0;
    overflow-x:hidden;
}

a {
    word-break: break-all;
}

#background {
    position:fixed;
    top:0;
    left:0;
    width:100vw;
    height:100vh;
    background: radial-gradient(circle, #ffffff, #f7ffff 75%, #ededed 100%);
    z-index:-1;
}

#cover-container {
    margin:0;
    padding:0;
    width:100vw;
    height:100vh;
    overflow:hidden;
}

#cover-background {
    position: absolute;
    top: 0;
    left: 0;
    margin:0;
    padding:0;
    width:100vw;
    height:100vh;
    filter: blur(5px);
    z-index: 2;
}

#cover {
    position: relative;
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 3;
}

.triangle-container {
    position: relative;
    width: 100vw;
    height: 100vh;
}

.triangle {
    position: absolute;
    width: 100%;
    height: 100%;
}

.triangle img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.triangle-left-top {
    clip-path: polygon(0 0, 100% 0, 100% 10%, 0 50%);
    img {
        object-position: -185px -200px;
        @media (min-aspect-ratio: 1.3/1) {
            object-position: -200px -500px;
        }
        @media (min-aspect-ratio: 1.7/1) {
            object-position: -200px -800px;
        }
    }
}

.triangle-right {
    clip-path: polygon(0 50%, 100% 0%, 100% 100%, 0 75%);
}

.triangle-left-bottom {
    clip-path: polygon(0 75%, 100% 90%, 100% 100%, 0% 100%);
    img {
        object-position: 0 60%;
    }
}

.align-center {
    text-align: center;
    align-items: center;
}

.blur-back {
    background: rgba(255, 255, 255, 0.5);
    padding: 20px;
    border-radius: 15px;
    backdrop-filter: blur(50px);
}

.down-arrow {
    position: relative;
    bottom: 100px;
    display: inline-block;
    width: 40px;
    height: 40px;
    border-top: 3px solid #000;
    border-right: 3px solid #000;
    transform: rotate(135deg);
    margin-top: 15px;
    z-index: 3;
    box-shadow: 5px -5px 10px 5px rgba(255, 255, 255, 0.6);
}

.down-arrow:hover {
    animation: down-arrow-shadow 2s infinite;
}

@keyframes down-arrow-shadow {
    0% {
        box-shadow: 5px -5px 10px 5px rgba(255, 252, 255, 0.6);
    }
    50% {
        box-shadow: 5px -5px 10px 5px rgb(255, 211, 65);
    }
    100%{
        box-shadow: 5px -5px 10px 5px rgba(255, 252, 255, 0.6);
    }
}

.main {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.headline {
    position: relative;
    margin: 20px 0;
    padding: 20px 10vw;
    background: rgba(0, 0, 0, 0.75);
    color: white;
}

.headline-left {
    position: absolute;
    background: white;
    text-decoration: none;
    user-select: none;
    top: 20px;
    left: 10px;
    width: 20px;
    height: 20px;
}

.headline-right {
    position: absolute;
    background: white;
    text-decoration: none;
    user-select: none;
    bottom: 20px;
    right: 20px;
    height: 25%;
    width: 2px;
}

.content {
    margin: 60px 0;
    width: 80vw;
    text-align: left;
    .inline-img, video {
        width: 100%;
        height: auto;
    }
    a {
        text-decoration: none;
    }
}

.content-body {
    position: relative;
    padding: 20px 25px 20px 40px;
    background: hsla(0,0%,93%,.2);
    font-size: 20px;
}

.content-top {
    position: absolute;
    height: 2px;
    width: 25%;
    background: #000;
    text-decoration: none;
    user-select: none;
    top: 5px;
    left: 5px;
}

.content-bottom {
    position: absolute;
    height: 2px;
    width: 25%;
    background: #000;
    text-decoration: none;
    user-select: none;
    bottom: 5px;
    right: 5px;
}

.content-card {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    align-items: center;
    gap: 50px;
    .card {
        position: relative;
        text-align: center;
        .card-icon {
            display: flex;
            justify-content: center;
            align-items: center;
            min-width: 100px;
            min-height: 100px;
            color: black;
        }
        .card-description {
            position: relative;
            display: flex;
            min-height: 40px;
            padding: 10px;
            justify-content: center;
            align-items: center;
            .card-right {
                position: absolute;
                width: 50px;
                height: 50px;
                text-decoration: none;
                user-select: none;
                top: 0;
                right: 0;
                border-top: 2px solid #000;
                border-right: 2px solid #000;
            }

            .card-left {
                position: absolute;
                width: 50px;
                height: 50px;
                text-decoration: none;
                user-select: none;
                bottom: 0;
                left: 0;
                border-bottom: 2px solid #000;
                border-left: 2px solid #000;
            }
        }
    }
}

.icon-discord {
    width: 200px;
    height: auto;
}

.icon-pixiv {
    color: #0096fa;
}

.icon-bilibili {
    color: white;
    padding: 10px;
    background: hotpink;
    border-radius: 20px;
}

.icon-booth {
    color: #ff5c67;
}

#footer {
    margin: 0;
    padding: 20px 0;
    width: 100vw;
}

.menu-container {
    position: fixed;
    bottom: 20px;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    z-index: 1;
    a {
        text-decoration: none;
    }
}

.menu-item {
    width: 130px;
    height: 40px;
    background-color: #333;
    color: white;
    text-align: center;
    line-height: 40px;
    border-radius: 8px;
    margin-bottom: 8px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s, transform 0.3s;
    pointer-events: none;
    user-select: none;
}

#menu-toggle:checked ~ a .menu-item {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.svg-button {
    width: 60px;
    height: 60px;
    cursor: pointer;
}

.svg-circle {
    fill: #333;
}

.svg-lines {
    stroke: white;
    stroke-width: 3;
    stroke-linecap: round;
}

#menu-toggle {
    display: none;
}