body {
        font-family: Arial, sans-serif;
        background-color: #eef2f7;
        text-align: center;
        padding: 20px;
    }
    h2 {
        color: #333;
        font-size: clamp(1.2rem, 4vw, 1.8rem);
    }
    p {
        font-size: clamp(0.9rem, 3vw, 1rem);
        color: #555;
    }
    .images {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 12px;
        justify-items: center;
        margin: 20px 0;
    }
    .images img {
        width: 100%;
        max-width: 110px;
        height: 110px;
        object-fit: cover;
        border-radius: 10px;
        cursor: pointer;
        transition: transform 0.2s ease, border 0.2s ease;
        border: 3px solid transparent;
    }
    .images img:hover {
        transform: scale(1.05);
    }
    .cat-highlight {
        animation: pulse 1s infinite;
        border-color: #4CAF50;
    }
    @keyframes pulse {
        0%, 100% { box-shadow: 0 0 0px rgba(76, 175, 80, 0.6); }
        50% { box-shadow: 0 0 12px rgba(76, 175, 80, 1); }
    }
    .btn-group {
        display: flex;
        justify-content: center;
        gap: 12px;
        margin-top: 15px;
        flex-wrap: wrap;
    }
    .btn {
        background-color: #4CAF50;
        color: white;
        border: none;
        padding: 12px 25px;
        font-size: 1rem;
        border-radius: 6px;
        cursor: pointer;
        transition: background 0.3s ease;
    }
    .btn:hover {
        background-color: #45a049;
    }
    .btn.refresh {
        background-color: #2196F3;
    }
    .btn.refresh:hover {
        background-color: #1976D2;
    }
    .toast {
        visibility: hidden;
        min-width: 220px;
        background-color: #4CAF50;
        color: white;
        text-align: center;
        border-radius: 6px;
        padding: 14px;
        position: fixed;
        z-index: 1;
        left: 50%;
        bottom: 30px;
        font-size: 16px;
        transform: translateX(-50%);
        opacity: 0;
        transition: opacity 0.5s, visibility 0.5s;
    }
    .toast.error {
        background-color: #f44336; /* 红色错误提示 */
    }
    .toast.show {
        visibility: visible;
        opacity: 1;
    }
    @media (max-width: 600px) {
        .images img {
            max-width: 90px;
            height: 90px;
        }
        .btn {
            padding: 10px 18px;
            font-size: 0.9rem;
        }
    }