.o-activity-grid {
    margin: 0 auto;
    max-width: 1000px;
    padding-top: 40px;
}

.o-activity-col {
    margin-bottom: 40px;
}

/* 活动卡片 - 上下布局 */
.o-activity-card {
    background: #fff;
    overflow: hidden;
    transition: all 0.4s ease;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    cursor: pointer;
    display: block;
    text-decoration: none;
}

.o-activity-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 36px rgba(0, 0, 0, 0.1);
}

/* 图片区域 - 高度400px */
.o-activity-img-wrapper {
    position: relative;
    overflow: hidden;
    background: #f0f0f0;
    width: 100%;
}

.o-activity-img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.o-activity-card:hover .o-activity-img {
    transform: scale(1.03);
}

/* 色块标签 - 左上角 */
.o-activity-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 16px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 600;
    color: #fff;
}

.o-activity-tag.contest {
    background: #e74c3c;
}

.o-activity-tag.design {
    background: #f39c12;
}

.o-activity-tag.hardware {
    background: #1a73e8;
}

.o-activity-tag.culture {
    background: #8e44ad;
}

.o-activity-tag.workshop {
    background: #16a085;
}

.o-activity-tag.live {
    background: #e67e22;
}

/* 状态色块 - 右上角 */
.o-activity-status {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 6px 16px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 600;
    color: #fff;
}

.o-activity-status.hot {
    background: #e74c3c;
}

.o-activity-status.soon {
    background: #2ecc71;
}

.o-activity-status.ongoing {
    background: #3498db;
}

/* 卡片信息 */
.o-activity-info {
    padding: 20px 24px 24px;
}

.o-activity-title {
    font-size: 20px;
    font-weight: 700;
    color: #1a1a2e;
    line-height: 1.4;
    margin-bottom: 12px;
}

.o-activity-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.55;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.o-activity-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid #f0f0f0;
}

.o-activity-date {
    font-size: 13px;
    color: #999;
}

.o-activity-prize {
    font-size: 13px;
    font-weight: 600;
    color: #e74c3c;
}