.big-event-years {
    background: rgba(255,255,255,0.80);
    border: 1px solid rgba(255,255,255,1);
    box-shadow: 0px 5px 20px 0px rgba(0,0,0,0.08);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    width: 120px;
    position: fixed;
    top: 50%;
    right: 5%;
    z-index: 10;
    transition: opacity 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94), 
                transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transform: translateY(-50%) translateX(30px); /* 初始时向右偏移 */

    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s;
}
.big-event-years.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%) translateX(0);
}
.big-event-years .button { 
    width: 100%;
    height: 32px;
    font-family: SourceHanSansSC-Bold;
    font-size: 14px;
    color: #646464;
    letter-spacing: 0;
    line-height: 32px;
    font-weight: 700;
    text-align: center;
    cursor: pointer;
}
.big-event {
    position: relative;
    width: 70%;
    max-width: 1440px;
    margin: 0px auto;
}
.big-event-header {
    width: 100%;
    position: relative;
    z-index: 1;
}
.big-event-header-img { 
    padding-top: 37%;
    background-image: url(../images/big-event/bg_cn@2x.webp);
    background-size: 100%;
    background-position: top;
    background-repeat: no-repeat;
}
.big-event-wrap {
    background-image: url(../images/big-event/bg_dna_w1360@2x.webp);
    background-size: 1000px;
    background-position: top;
    background-repeat: repeat-y;
    margin-top: -12%;
}
.big-event-year:not(:first-child) {
    margin-top: 20px;
}

.big-event-month {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.big-event-month:not(:first-child) {
    margin-top: 20px;
}
.big-event-month-header {
    width: 300px;
    height: 84px;
    background-image: url(../images/big-event/month-base@2x.png);
    background-repeat: no-repeat;
    background-size: cover;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 64px;
}
.big-event-month-title {
    font-family: SourceHanSansSC-Heavy;
    font-size: 24px;
    color: #FFDD3A;
    letter-spacing: 0;
    text-align: center;
    line-height: 32px;
    font-weight: 900;
}

.big-event-month-year {
    font-family: SourceHanSansSC-Regular;
    margin-top: 0px;
    font-size: 18px;
    color: #FFFFFF;
    letter-spacing: 0;
    text-align: center;
    line-height: 20px;
    font-weight: 400;
}

.big-event-days {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(35%, 1fr));
    grid-auto-rows: 10px; /* 最小行高 */
    gap: 0px;
    column-gap: 30%;
    justify-content: center;
    width: 100%;
}

.big-event-day {
    height: auto;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    font-size: 24px;
    padding: 0px;
    text-align: left;
}

.big-event-day:nth-child(2) .big-event-day-content {
    padding-top: 70px;
}

.big-event-day-content {
    width: 100%;
    padding-bottom: 10px;
}

.big-event-day-title {
    font-size: 22px;
    font-weight: bold;
    color: #019C7E;
    text-shadow: -1px -1px 0 #FFFFFF, 1px -1px 0 #FFFFFF, -1px 1px 0 #FFFFFF, 1px 1px 0 #FFFFFF;
}
.big-event-day-text {
    font-family: SourceHanSansSC-Regular;
    font-size: 14px;
    color: #323232;
    margin-top: 16px;
    text-shadow: -1px -1px 0 #FFFFFF, 1px -1px 0 #FFFFFF, -1px 1px 0 #FFFFFF, 1px 1px 0 #FFFFFF;
}
.big-event-day-img {
    margin-top: 17px;
    width: 100%;
    border: 2px solid rgba(255,255,255,1);
    box-shadow: 4px 8px 20px 0px rgba(0,0,0,0.2);
    border-radius: 8px;
}
.big-event-day.left .big-event-day-title {
    text-align: right;
}
.big-event-day.right .big-event-day-title {
    text-align: left;
}