/* --- 滾動文字浮現動畫核心 (Scroll Reveal) --- */
.reveal-item {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 1.2s cubic-bezier(0.215, 0.610, 0.355, 1.000), 
                transform 1.2s cubic-bezier(0.215, 0.610, 0.355, 1.000);
    will-change: opacity, transform;
}

/* 當 JS 偵測到進入視窗時，加上 active 類名觸發優雅上浮 */
.reveal-item.active {
    opacity: 1;
    transform: translateY(0);
}