/* 升级提示弹窗样式 */
.upgrade-popup-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 99999;
    justify-content: center;
    align-items: center;
}

.upgrade-popup-box {
    position: relative;
    width: 580px;
    max-width: 90%;
    background: #fff;
    border-radius: 16px;
    padding: 50px 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: popupAppear 0.4s ease-out;
}

@keyframes popupAppear {
    from {
        opacity: 0;
        transform: scale(0.8) translateY(-30px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.upgrade-popup-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 36px;
    color: #999;
    cursor: pointer;
    transition: color 0.3s;
    line-height: 1;
}

.upgrade-popup-close:hover {
    color: #333;
}

.upgrade-popup-content {
    text-align: center;
}

.upgrade-popup-icon {
    width: 90px;
    height: 90px;
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a5a 100%);
    border-radius: 50%;
    margin: 0 auto 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 50px;
    color: #fff;
    font-weight: bold;
    box-shadow: 0 10px 30px rgba(238, 90, 90, 0.4);
    animation: iconPulse 2s infinite;
}

@keyframes iconPulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 10px 30px rgba(238, 90, 90, 0.4);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 15px 40px rgba(238, 90, 90, 0.6);
    }
}

.upgrade-popup-message {
    font-size: 26px;
    color: #333;
    margin-bottom: 35px;
    line-height: 1.6;
    font-weight: 500;
}

.upgrade-popup-link {
    display: inline-block;
    padding: 18px 50px;
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a5a 100%);
    color: #fff;
    font-size: 22px;
    font-weight: bold;
    text-decoration: none;
    border-radius: 50px;
    transition: all 0.3s;
    box-shadow: 0 8px 25px rgba(238, 90, 90, 0.4);
}

.upgrade-popup-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(238, 90, 90, 0.6);
    background: linear-gradient(135deg, #ff8787 0%, #ff6b6b 100%);
}