/* =========================================================
 * 공통 "맨 위로" 버튼 스타일 (scroll-top-btn 접두사)
 * 우하단 고정, 스크롤 300px 초과 시 페이드인 노출.
 * ========================================================= */

.scroll-top-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1030;

    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background-color: #2563eb;
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);

    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    line-height: 1;
    cursor: pointer;

    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.2s ease, visibility 0.2s ease, background-color 0.15s ease;
}

.scroll-top-btn.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.scroll-top-btn:hover {
    background-color: #1d4ed8;
}

.scroll-top-btn:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
}