body {
    background-color: #FFFFFF;
    color: #111111;
    font-family: 'Noto Serif JP', serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.writing-vertical {
    writing-mode: vertical-rl;
    text-orientation: upright;
}

/* 控えめなフェードインアニメーション */
.fade-element {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1.5s cubic-bezier(0.2, 0.8, 0.2, 1), transform 1.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.fade-element.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* リンクのホバーエフェクト */
.hover-underline {
    position: relative;
    display: inline-block;
}
.hover-underline::after {
    content: '';
    position: absolute;
    width: 100%;
    transform: scaleX(0);
    height: 1px;
    bottom: -4px;
    left: 0;
    background-color: currentColor;
    transform-origin: bottom right;
    transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}
.hover-underline:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* 画像のホバーエフェクト */
.img-wrap {
    overflow: hidden;
}
.img-wrap img {
    transition: transform 2s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.img-wrap:hover img {
    transform: scale(1.05);
}