/* 全域手機版導覽列與選單樣式 (仿首頁側邊欄風格) */
@media (max-width: 768px) {
    /* TOP 懸浮按鈕 */
    .floating-action-btn {
        position: fixed;
        bottom: 30px; /* 改回較低的位置 */
        right: 20px;
        background: #fff;
        color: var(--text-main);
        width: 60px;
        height: 60px;
        border-radius: 50%;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        font-size: 12px;
        font-weight: bold;
        cursor: pointer;
        z-index: 99;
        opacity: 0;
        pointer-events: none;
        transition: all 0.3s ease;
        border: 1px solid rgba(0, 0, 0, 0.05);
    }
    .floating-action-btn.visible {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }
}