.waterfall-item .card {
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--gray-border);
    height: 100%;
}

.waterfall-item .card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px var(--shadow-color);
}

.card-img-top-wrapper {
    position: relative;
    width: 100%;
    padding-top: 70%;
    background: var(--light-color);
    overflow: hidden;
}

.card-img-top-wrapper .card-img-top {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card-img-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--light-color);
    color: var(--gray);
}

.card-img-placeholder i {
    font-size: 48px;
    margin-bottom: 8px;
}

.card-img-placeholder span {
    font-size: 14px;
}

.card-tags {
    position: absolute;
    top: 10px;
    left: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    z-index: 2;
}

.tag-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    color: var(--white-color);
    letter-spacing: 0.5px;
}

.tag-top { background: var(--danger-color); }
.tag-essence { background: var(--orange-color); }
.tag-hot { background: var(--blue-color); }

.card-body {
    padding: 12px 15px;
    flex: 1;
}

.card-title {
    font-size: 16px;
    line-height: 1.5;
    color: var(--dark-color);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-decoration: none;
    margin-bottom: 6px;
}

.card-title:hover {
    color: var(--blue-color);
}

.card-text {
    font-size: 14px;
    color: var(--gray);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.6;
    margin-bottom: 0;
}

.card-meta {
    border-top: 1px solid var(--gray-lighter);
    padding-top: 10px;
    margin-top: auto;
}

.meta-left {
    font-size: 13px;
    color: var(--gray);
}

.meta-left span {
    margin-right: 12px;
}

.meta-left span i {
    margin-right: 3px;
}

.meta-right {
    font-size: 12px;
    color: var(--gray);
}

.filter-bar {
    background: var(--light-color);
    border-radius: 8px;
    padding: 16px;
    margin: 12px 16px 0;
}
.filter-group {
    margin-bottom: 12px;
}
.filter-group:last-child {
    margin-bottom: 0;
}
.filter-group-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 8px;
    display: block;
}
.filter-values {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.filter-value {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
    border: 1px solid var(--gray-border);
    background: var(--white-color);
    color: var(--gray);
    transition: all 0.2s;
    text-decoration: none;
    white-space: nowrap;
}
.filter-value:hover {
    border-color: var(--blue-color);
    color: var(--blue-color);
    background: var(--blue-light);
}
.filter-value.active {
    background: var(--blue-color);
    color: var(--white-color);
    border-color: var(--blue-color);
}
.filter-reset {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 13px;
    border: 1px dashed var(--danger-color);
    background: var(--white-color);
    color: var(--danger-color);
    text-decoration: none;
    transition: all 0.2s;
    margin-top: 12px;
}
.filter-reset:hover {
    background: var(--danger-color);
    color: var(--white-color);
}