:root {
    --viewport: 1920;
    --base-unit: calc(100vw * 10/var(--viewport));
    --font-family-noto-sans: "Noto Sans JP", sans-serif;
    --font-family-zen-mincho: "Zen Old Mincho", serif;
    --bg_color: #d9d4ce;
    --cl_orange: #9d2700;
}

body {
    font-family: var(--font-family-noto-sans);
    width: 100vw;
    height: 100svh;
    overflow-x: hidden;
    overflow-y: auto;
    font-size: var(--base-unit);
}

main {
    width: 100%;
    height: 100%;
    background-color: var(--bg_color);
    position: relative;
    overflow-x: hidden;
    overflow-y: hidden;

}

.bg-grad {
    width: 50%;
    aspect-ratio: 1;
    border-radius: 50vh;
    background-color:var(--cl_orange);
    filter: blur(7rem);
    opacity: .15;
    bottom: 0;
    right: 0;
    position: absolute;
    transform: translate(50%, 50%);
}

.position-base {
    position: absolute;
    transform: translate(-50%, -50%);
}

.grad-line {
    width: 110%;
    height: auto;
    top: 88%;
    left: 50%;
    opacity: 0;
    filter: blur(1rem);
}

.grad-line.is-active {
    opacity: 1;
    filter: blur(0rem);
    transition: all 1s;
    transition-delay: 0.3s;
}

.logo {
    top: 45%;
    left: 50%;
    width: 60%;
    opacity: 0;
    filter: blur(1rem);
}

.logo.is-active {
    opacity: 1;
    filter: blur(0rem);
    transition: all 1s;
    transition-delay: 0.5s;
}

/* ーータブレットーーー */
@media (max-width: 1000px) {
    .grad-line {
        top: 80%;
    }
    
    
}

/* ーースマホーーー */
@media (max-width: 768px) {
    .grad-line {
        width: 150%;
        transform: translate(-50%, -50%) rotate(20deg);
        top: 73%;
    }
    .logo {
        top: 45%;
        width: 80%;
    }

}