body { 
    font-family: Arial, sans-serif; 
    padding: 20px; 
    margin: 0;
    box-sizing: border-box;
}

h1 {
    font-size: 1.5rem;
    text-align: center;
}

label {
    font-size: 1rem;
    margin-bottom: 5px;
}

input[type="number"], input[type="text"] {
    width: 100%;
    padding: 10px;
    margin: 5px 0 15px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
}

button {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}

button:hover {
    background-color: #45a049;
}

#coupons {
    display: flex;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.coupon {
    width: calc(50% - 10px);
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #f9f9f9;
    box-sizing: border-box;
    margin-bottom: 10px;
}

.coupon label {
    font-size: 0.9rem;
    flex-grow: 1;
}

.coupon button {
    width: 70px;
    padding: 5px;
    font-size: 0.8rem;
    background-color: #ff5f5f;
    border: none;
    color: white;
    border-radius: 4px;
    cursor: pointer;
}

#result {
    color: red; /* 设置计算结果颜色为红色 */
    font-size: 1.2rem; /* 调整结果字体大小 */
    margin-top: 20px; /* 增加顶部边距 */
    font-weight: bold; /* 加粗文本 */
}

@media (max-width: 600px) {
    h1 {
        font-size: 1.2rem;
    }

    label {
        font-size: 0.9rem;
    }

    button {
        font-size: 0.9rem;
        padding: 8px;
    }

    input[type="number"], input[type="text"] {
        font-size: 0.9rem;
    }

    .coupon {
        width: calc(50% - 10px);
    }
}