/* style.css */

/* ベース設定と微調整 */
body {
    color: #334155;
    line-height: 1.8;
    background-color: #f1f5f9;
}
img {
    max-width: 100%;
    height: auto;
    border-radius: 4px;
}
.text-shadow { text-shadow: 1px 1px 2px rgba(0,0,0,0.1); }

/* カスタム見出し装飾 */
.heading-primary {
    position: relative;
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}
.heading-primary::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 50px;
    height: 3px;
    background-color: #ea580c;
}

/* スムーススクロール */
html { scroll-behavior: smooth; }

/* トップへ戻るボタン */
#page-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 50;
}
#page-top.show {
    opacity: 1;
    visibility: visible;
}