:root {
    --bg: #2b3340;
    /* 深色背景（主体） */
    --muted: #9ea7b2;
    /* 次级文字灰 */
    --white: #ffffff;
    --accent: #e6eef6;
    /* 分隔线/浅色 */
    --footer-bottom: #f5f7f9;
    /* 底部浅条背景 */
    --card-bg: #ffffff;
    --max-width: 420px;
}

.mobile-frame {
    width: 100%;
    /* max-width: var(--max-width); */
    /*box-shadow: 0 6px 24px rgba(20, 24, 30, 0.08);*/
    /*border-radius: 8px;*/
    overflow: hidden;
    background: linear-gradient(#ffffff00, #ffffff00);
}

.footer {
    background: var(--bg);
    color: var(--white);
    padding: 15px 18px;
}

/* 顶部三列（关于我们 / 抗衰探索 / 长寿中国） */
.footer-topcols {
    display: flex;
    gap: 12px;
    justify-content: space-between;
    margin-bottom: 18px;
    text-align: center;
}

.col {
    flex: 1 1 0;
    min-width: 0;
}

.col h3 {
    margin: 8px auto;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: 0.4px;
}

.col h3 a {
    color: var(--white);
    text-decoration: none;
}

.col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.col li a {
    color: var(--muted);
    font-size: 14px;
    line-height: 1.8rem;
    white-space: nowrap;
    /* overflow: hidden; */
    text-overflow: ellipsis;
    text-decoration: none;
}

/* 二维码 + 品牌行 */
.footer-contact {
    display: flex;
    gap: 4vw;
    /* align-items: flex-start; */
    align-items: center;
    padding: 6px 20px 10px;
    margin: 0 auto;
    width: 88%;
}

.qr-wrap {
    flex: 0 0 30vw;
    /* width: 80px; */
    /* height: 80px; */
    /* background: var(--white); */
    /*padding: 8px;*/
    /*border-radius: 6px;*/
    display: flex;
    align-items: center;
    /* justify-content: center; */
    /* box-shadow: 0 1px 0 rgba(255, 255, 255, 0.02) inset; */
}

.qr-wrap img {
    /* width: 115px; */
    /* height: auto; */
    display: block;
    border-radius: 4px;
    width: 90%;
    /* max-width: 100%; */
    /* max-height: 100%; */
}

/* 内置二维码 SVG 宽高自适应 */
.qr-wrap svg {
    width: 88px;
    height: 88px;
    display: block;
    border-radius: 4px
}

.brand {
    flex: 1;
    color: var(--white);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.brand-head {
    display: flex;
    gap: 12px;
    align-items: center;
}

.brand-head img {
    width: 100%;
    /* height: 44px; */
    /* border-radius: 50%; */
    /* flex-shrink: 0; */
    /* box-shadow: 0 1px 0 rgba(255, 255, 255, 0.02) inset; */
}

.brand-logo {
    width: 44px;
    height: 44px;
    flex: 0 0 44px;
}

.brand-name {
    font-size: 20px;
    font-weight: 700;
    line-height: 1;
}

.brand-name .zh {
    display: block;
    font-size: 16px;
    font-weight: 500;
    margin-top: 4px;
    letter-spacing: 2px;
}

.brand-sep {
    margin: 10px 0;
    border: none;
    height: 1px;
    background: rgba(255, 255, 255, 0.06);
}

.brand p {
    color: var(--muted);
    font-size: 0.75rem;
    line-height: 1.5;
    margin: 0;
}

/* 底部浅条（备案与阿里云提示） */
.footer-bottom {
    background: var(--footer-bottom);
    color: #6c6f73;
    font-size: 13px;
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    /*gap: 8px;*/
    align-items: center;
}

.footer-bottom .icp {
    width: 100%;
    text-align: center;
}

.footer-bottom .aliyun {
    width: 100%;
    text-align: center;
    color: #9aa0a6;
    display: flex;
    gap: 8px;
    align-items: center;
    justify-content: center;
    font-size: 13px;
}

body {
    margin: 0;
    font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    background: #fdfaf5;
    color: #333;
}

.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    z-index: 1000;
    background: #1d2088;
    color: #fff;
    height: 3.5rem;
    display: flex;
    align-items: center;
    font-size: 1rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.nav-list {
    display: flex;
    gap: 1rem;
    list-style: none;
    margin: 0 auto;
    padding: 0;
    width: 100%;
    justify-content: center;
}

.nav-item {
    display: flex;
    align-items: center;
}

.nav-item:not(:last-child)::after {
    content: "|";
    color: #fff;
    margin-left: 1rem;
    margin-right: 0;
    font-size: 0.8rem;
    opacity: 0.5;
}

.nav a {
    color: #fff;
    text-decoration: none;
    padding: 0 0.2rem;
    display: block;
}

/* 轮播广告区域 */
.carousel-section {
    width: 100%;
    padding-top: 3.5rem;
    aspect-ratio: 3 / 2;
    position: relative;
    overflow: hidden;
}

.carousel-container {
    height: 100%;
    margin: 0 auto;
    position: relative;
}

.carousel {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.carousel-inner {
    display: flex;
    transition: transform 0.8s ease-in-out;
    height: 100%;
    width: 400%;
}

.carousel-item {
    flex: 0 0 25%;
    height: 100%;
    position: relative;
}

.carousel-img {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
}

.carousel-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
}

.carousel-indicators {
    position: absolute;
    bottom: 20px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: 12px;
    z-index: 10;
}

.indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
}

.indicator.active {
    background: white;
    transform: scale(1.2);
}

.carousel-control {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 30px;
    height: 30px;
    background: rgba(0, 0, 0, 0.3);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 10;
}

.carousel-control:hover {
    background: rgba(0, 0, 0, 0.6);
}

.carousel-control.prev {
    left: 20px;
}

.carousel-control.next {
    right: 20px;
}

/* 视频播放模块 */
.video-section {
    /* max-width: 1200px; */
    margin: 15px 10px;
    padding-top: 3.5rem;
}

.video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 15px;
    overflow: hidden;
    /* box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2); */
    /*background: #000;*/
}

#videoPlayer {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /*background: rgba(0, 0, 0, 0.4);*/
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.5s ease;
}

.video-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.play-btn {
    width: 50px;
    height: 50px;
    background: rgba(0, 0, 0, 0.2);
    /*backdrop-filter: blur(10px);*/
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.play-btn:hover {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.3);
}

.play-btn i {
    color: white;
    font-size: 1.5rem;
    margin-left: 8px;
}

.video-controls {
    position: absolute;
    bottom: 20px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    gap: 15px;
    z-index: 10;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-container:hover .video-controls {
    opacity: 1;
}

.video-btn {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 50px;
    font-weight: 500;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.video-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.cut_image {
    /* display: flex; */
    display: block;
    /* flex-wrap: wrap; */
    /* gap: 0; */
}

.content {
    padding-top: 3.5rem;
}

.cut_image img {
    display: block;
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 0;
    border: none;
}

.link_to {
    display: grid;
    grid-template-columns: 1fr 1fr;
    /* grid-template-rows: 1fr 1fr; */
    /* width: 100vw; */
    /* height: 50vw; */
    /* margin: 0; */
    /* padding: 0; */
}

.link_to img {
    width: 100%;
    /* height: 100%; */
    /* object-fit: cover; */
    /* margin: 0; */
    /* padding: 0; */
    /* border: none; */
    display: block;
}