body {
    background: #f7d6ff;
}

@keyframes slide-fade-in {
    from {
        opacity: 0.1;
        transform: scale(0.9) translateY(1vh);
    }
}

.cards {
    display: grid;
    gap: 2rem;
    grid-auto-flow: dense;
    grid-template-columns: repeat(5, 30ch);
    /* 5 列，每列宽度平均分配 */
}

.card {
    animation: slide-fade-in both;
    animation-timeline: view();
    animation-range: contain 0% contain 100%;
    border-radius: 10px;
    line-height: 6;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    font-size: 32px;
    letter-spacing: 5px;
    color: #FFF;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-image: linear-gradient(to bottom right, #a1c4fd, #c2e9fb, #d1cfe2, #e0b3d7, #f0b3d5, #f9bccc);
    display: flex;
    justify-content: center;
    align-items: center;
}

.card:hover {
    transform: scale(1.05) translateY(0);
}

.card img {
    width: 100%;
    height: 100%;
}

.card:nth-of-type(4n) {
    grid-column: span 2;
}

.card:nth-of-type(5n) {
    grid-column: span 2;
}

.card:nth-of-type(7n) {
    grid-row: span 2;
}

.btn {
    display: inline-block;
    padding: 12px 20px;
    border: none;
    border-radius: 30px;
    padding: 12px 30px;
    font-size: 16px;
    font-weight: bold;
    text-align: center;
    color: #fff;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn:hover {
    transform: scale(1.5);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn:active {
    transform: scale(0.98);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn span {
    font-size: 18px;
}


.card ul {
    display: block;
    position: absolute;
    top: 0px;
    right: 10px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
    list-style: none;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 14px;
    color: #333;
    z-index: 10;
    width: calc(50% - 20px);
    transform: translateY(100px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
}

/* hover 显示信息框，向上弹出 + 淡入 */
.card:hover ul {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.card li {
    line-height: 1.6em;
    margin: 4px 0;
}

.card li.title {
    font-weight: bold;
    font-size: 16px;
    color: #2c3e50;
    border-bottom: 1px solid #a7d5ff;
    padding-bottom: 5px;
    margin-bottom: 6px;
}

.card li.catno {
    color: #3498db;
    font-weight: 500;
}

.card li.price {
    color: #e74c3c;
    font-style: italic;
    font-weight: bold;
}