html, body {
    overflow-x: hidden; 
    width: 100%;
    margin: 0;
    padding: 0;
}

/* 全ての要素に border-box を適用 */
*, *::before, *::after {
    box-sizing: border-box;
}
body{
    font-family: 
    'Noto Sans', 
    "Helvetica Neue",
    Arial,
    "Hiragino Kaku Gothic ProN",
    "Hiragino Sans",
    "Noto Sans JP",
    sans-serif;

    font-size: 16px;
    line-height: 1.5;
    color: #fff;

    position: relative;
    margin: 0;
    min-height: 100vh;
}
html{
    scroll-behavior: smooth;
}
body::before{
    content: "";
    position: fixed;
    inset: 0;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    opacity: 0.20;
    z-index: -1;
    pointer-events: none;
}
@font-face {
    font-family: 'keifont';
    src: url('../fonts/keifont.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
}
/*
icon
*/
.icon-img{
    border-radius: 50%;
    overflow: hidden;
}
/* 
slidein
*/
.slidein-left, .slidein-right, .slidein-bottom, .slidein-up {
    opacity: 0;
    /* transition: 0.4s ease; */
    transition-duration: 0.7s;
}
.slidein-left{
    transform: translateX(-50px);
}
.slidein-right{
    transform: translateX(50px);
}
.slidein-bottom{
    transform: translateY(50px);
}
.slidein-up{
    transform: translateY(-50px);
}
.is-visible{
    opacity: 1 ;
    transform: translate3d(0, 0, 0) ;
}
/* 
section
 */
.section{
    padding: 40px 0;
    margin: 0 0 0px;
    width: 100%;
}
.section.secondary{
    position: relative;
    background-color: rgba(208, 230, 241, 0.72);
    margin: 0 0 60px;
}
.section.secondary::before,
.section.secondary::after{
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    height: 30px;
    pointer-events: none;
}
.section.secondary::before{
    top: -25px;
    background: linear-gradient(to bottom, rgba(208, 230, 241, 0), rgba(208, 230, 241, 0.72));
}
.section-headline{
    font-size: 32px;
    font-weight: bold;
    text-align: left;
    margin: 0 0 30px;
}
.section-disc {
    font-size: 1rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.8); 
    max-width: 800px;           
    margin: 0 auto 40px;       
    text-align: center;         
    padding: 0 20px;
    position: relative;
    letter-spacing: 0.05em;
}


.section-disc::before,
.section-disc::after {
    content: "";
    display: block;
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, #00c3ff, transparent);
    margin: 15px auto;
    opacity: 0.6;
}
.topsection-headline{
    font-size: 32px;
    font-weight: bold;
    text-align: center;
    margin: 0 0 30px;
}
.section-headline{
    font-size: 32px;
    font-weight: bold;
    text-align: left;
    margin: 0 0 30px;
}
.section-button{
    margin-top: 40px;
    text-align: center;
}


@keyframes line-grow {
    0% { transform: scaleY(0); transform-origin: top; }
    100% { transform: scaleY(1); transform-origin: top; }
}

@keyframes hero-headline-pop {
    0% { opacity: 0; transform: translateY(20px); }
    100% { opacity: 1; transform: translateY(0); }
}

.footer{
    .keifont {
        font-family: 'keifont', sans-serif !important;
    }
    padding: 20px 0;
}