body {
    margin: 0;
}


.header-section {
    width: 100%;
    height: 920px; 
    background-image: url('https://static.web.sdo.com/dnr/pic/wuniang/bg_1.webp'); 
    background-repeat: no-repeat;
    background-position: top center;
    background-size: cover; 
    margin: 0 auto;
}


.content-section {
    width: 100%;
    height: 2790px; 
    background-repeat: no-repeat;
    background-position: top center;
    background-size: cover;
    position: relative; 
    margin: 0 auto;
    margin-top: -2px; 
}


.carousel-section {
    position: absolute;
    width: 1180px;
    height: fit-content;
    bottom: 90px; 
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 20px;
}


.main-display {
    width: 890px;
    height: 570px;
    position: relative;
    overflow: hidden;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 35px;
}

.main-display img {
    position: relative; 
    z-index: 1;  
}

.main-display::after {
    content: ''; 
    position: absolute; 
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://static.web.sdo.com/dnr/pic/wuniang/lunbo-l.png');
    background-repeat: no-repeat;
    background-position: center;
    background-size: 100% 100%; 
    z-index: 2;
    pointer-events: none; 
}

.thumbnail-area {
    width: 250px;
    height: 644px;
    position: relative;
    display: flex;
    flex-direction: column;
}


.arrow-up {
    width: 100%;
    height: 40px;
    background-image: url('https://static.web.sdo.com/dnr/pic/wuniang/arrow-top.png');
    background-color: transparent; 
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.arrow-up:hover {
    transform: translateY(-2px);
    filter: brightness(1.2);
}

.arrow-up::before {
    display: none;
}

.thumbnail-container {
    flex: 1;
    overflow: hidden;
    position: relative;
    margin: 10px 0;
}

.thumbnail-wrapper {
    height: 100%;
    transition: transform 0.4s ease-in-out;
}

.thumbnail-item {
    width: 244px;
    height: 160px;
    margin-bottom: 20px;
    cursor: pointer;
    overflow: hidden;
    position: relative;
    transition: all 0.3s ease;
    border: 3px solid transparent;
    background-color: transparent; 
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

.thumbnail-item:last-child {
    margin-bottom: 0;
}

.thumbnail-item img {
    width: 100%;
    height: 100%;
    object-fit: fill;
    transition: transform 0.3s ease;
    cursor: pointer;
}

.thumbnail-item.active {
    border-color: #ff6b35;
    box-shadow: 0 0 20px rgba(255, 107, 53, 0.6);
}

.arrow-down {
    width: 100%;
    height: 40px;
    background-image: url('https://static.web.sdo.com/dnr/pic/wuniang/arrow-bottom.png');
    background-color: transparent; 
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0 0 8px 8px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.arrow-down:hover {
    transform: translateY(2px);
    filter: brightness(1.2);
}

.arrow-down::before {
    display: none;
}


.fixed-reserve-btn {
    position: fixed; 
    top: 15%;       
    right: 40px;      
    z-index: 999;    
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px); 
    transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.4s ease;
}

.fixed-reserve-btn img {
    display: block; 
    width: 150px;   
    height: auto;
}

.fixed-reserve-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}