.pick-option-hint {
    color: #D53134;
    font-weight: 500;
    margin-bottom: 10px;
}

.sticky-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: white;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    z-index: 50;
    display: none; /* 默认隐藏 */
}

.footer-content {
    max-width: 768px;
    margin: 0 auto;
    padding: 12px 16px;
}

.add-to-cart-btn {
    width: 100%;
    background-color: #000000; /* 黑色背景 */
    color: white;
    font-weight: 600;
    padding: 16px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    font-size: 18px; /* 增大字体 */
}

.add-to-cart-btn:hover {
    background-color: #1a1a1a;
    transform: scale(1.02);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.add-to-cart-btn:active {
    transform: scale(0.98);
}

/* 禁用状态样式 */
.add-to-cart-btn:disabled {
    background-color: #4b5563;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    opacity: 0.7;
}

.bottom-spacer {
    display: none;
    height: 70px;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.pulse-animation {
    animation: pulse 0.5s ease-in-out;
}

@media (max-width: 768px) {
    .sticky-footer {
        display: block;
    }

    .bottom-spacer {
        display: block !important;
    }
}