/* --- 1. 全域設定 (絕對要保留) --- */
* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    overflow-x: hidden; /* 確保手機版不會左右晃動 */
    background-color: rgb(248, 226, 3);
}

/* --- 2. 容器結構 --- */
.main-slider {
    position: relative;
    width: 100%;
}

.slider-wrapper {
    display: flex;
    width: 100%;
    align-items: flex-start;
    overflow: hidden;
}

.big-group {
    min-width: 100%;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.big-group > div {
    width: 70%;
    margin: 0 auto;
}

.big-group img {
    width: 100%;
    display: block;
}

/* --- 3. 圓形箭頭設定 --- */
.arrow {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10002;
    background: rgba(0, 0, 0, 0.4);
    color: #ffffff;
    border: none;
    
    /* 圓形核心設定 */
    width: 70px; 
    height: 70px;
    border-radius: 50%;
    
    /* 置中箭頭符號 */
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px; 
    
    cursor: pointer;
    user-select: none;
    transition: background 0.2s, transform 0.1s;
}

.arrow:hover { background: rgba(0, 0, 0, 0.7); }
.arrow:active { transform: translateY(-50%) scale(0.9); }

.prev { left: 20px; }
.next { right: 20px; }

/* --- 4. 頁碼與手機版適配 --- */
.page-number {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10003;
    font-family: 'Arial Black', sans-serif;
    font-size: 40vw;
    color: rgba(255, 255, 255, 0.7);
    font-weight: bold;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.page-number.show { opacity: 1; }

@media screen and (max-width: 768px) {
    .slider-wrapper .big-group > div { width: 100% !important; }
    .arrow {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
}