#full-height {
    height: 100vh !important;
    width: 100vw !important;
}

#activity-bg {
    width: 99vw;
    aspect-ratio: 50 / 13; /* 宽高比固定为 10 : 3 */
    position: absolute;
    overflow: hidden;
}

#activity-bg img {
    width: 100%;
    height: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%); /* 水平、竖直居中 */
    filter: brightness(50%) blur(20px); /* 图片变暗、变模糊 */
}

#activity-info {
    margin-top: 6.5vw;
}

#activity-content .section-header {
    padding-bottom: 50px;
    margin-bottom: 40px;
}

#activity-content .section-header h2 {
    height: 3.5vw;
    font-size: 2.5vw;
    color: #fff;
}

#activity-content .section-header p {
    height: 4.5vw;
    font-size: 1vw;
    font-weight: 300;
    color: #fff;
}

#activity-data-cover {
    width: 48vw;
    display: block;
    margin: 0 auto 40px auto;
    transition: transform ease 1s, box-shadow ease 1s;
    position: relative;
}

#activity-data-cover:hover {
    transform: scale(1.05);
    box-shadow: 0 0 10px 5px rgba(0, 0, 0, 0.5);
}

#activity-data-bilibili {
    width: 5vw;
    display: block;
    margin: auto;
}

.agenda-description-box{
    margin: 0 auto;
}

#activity-description{
    margin: 60px auto 30px;
    padding: 35px 35px;
    border-radius: 10px;
    background: #fafafa;
    transition: background-color ease-in-out 0.3s, box-shadow ease-in-out 0.3s;
}

#activity-description p{
    margin: 0;
    font-size: 18px;
    line-height: 1.8;
}

#activity-description p b {
    background-image: linear-gradient(45deg, #09009f, #4869df);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

#activity-description:hover{
    background-color: #fff;
    box-shadow: 0 0 10px 5px rgba(0, 0, 0, 0.02);
}

.segment-1 {
    text-align: center;
}

.segment-1-layout{
    background: #fafafa;
    border: 1px solid transparent;
    position: relative;
    border-radius: 10px;
    padding: 20px 32px !important;
    transition: background-color ease-in-out 0.3s, box-shadow ease-in-out 0.3s;
}

.segment-1-layout:hover{
    background-color: #fff;
    box-shadow: 0 0 10px 5px rgba(0, 0, 0, 0.02);
}

.segment-1-layout h4{
    margin-bottom: 0;
    font-weight: 600;
}

.segment-1-layout img {
    max-width: 150px;
    height: auto;
    padding: 0;
    margin: 0 auto 12px;
    overflow: hidden;
    border-radius: 50%;
}

.segment-1-layout .segment-time{
    margin: 7px auto 25px;
    color: #5c636a;
    font-size: 14px;
    font-weight: 300;
}

.segment-1-layout .segment-cover{
    margin: 0 auto;
}