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one-case-per-day
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15-drink-water.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>drink-water</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }

        body {
            width: 100vw;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            background-color: #3494e4;
            color: #fff;
        }

        .bottom {
            width: 180px;
            height: 400px;
            border: 5px solid #144fc6;
            border-bottom-left-radius: 50px;
            border-bottom-right-radius: 50px;
            background-color: #fff;
            color: #144fc6;
            overflow: hidden;

            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        .empty {
            width: 100%;
            height: 100%;
            font-size: 24px;


            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            transition: all 0.3s ease;
        }

        .empty p {
            font-size: 16px;
            font-weight: 100;
        }

        .water {
            flex:1;
            width: 100%;
            font-weight: bold;
            font-size: 24px;
            color: #144fc6;
            background-color: #3494e4;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        .cups {
            width: 280px;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
        }

        .cup {
            width: 50px;
            height: 90px;
            border: 3px solid #144fc6;
            border-radius: 0 0 15px 15px;
            margin: 5px;
            background-color: rgba(255, 255, 255, .8);
            color: #144fc6;
            cursor: pointer;
            font-size: 16px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .full {
            color: #fff;
            background-color: #6ab3f8;
        }

        .hidden {
            visibility: hidden;
        }

    </style>
</head>
<body>
    <h1>Drink Water</h1>
    <p>Goal : 2 Liters</p>
    <div class="bottom">
        <div class="empty">
            2L
        </div>
        <div class="water hidden">0%</div>
    </div>
    <p>Select how many glasses of water that you have drank</p>
    <div class="cups">
        <div class="cup">250ml</div>
        <div class="cup">250ml</div>
        <div class="cup">250ml</div>
        <div class="cup">250ml</div>
        <div class="cup">250ml</div>
        <div class="cup">250ml</div>
        <div class="cup">250ml</div>
        <div class="cup">250ml</div>
    </div>

    <script>
        const cups = document.querySelectorAll('.cup');
        const empty = document.querySelector('.empty');
        const water = document.querySelector('.water')

        let current = 0 //当前占比
        let goal = 2
        cups.forEach((cup,index)=>{
            cup.addEventListener('click',(e)=>{
                if(cup.classList.contains('full')){
                    // 在这之后的全部置空
                    for(let i=index;i<cups.length;i++){
                        cups[i].classList.remove('full')
                    }
                    current = 100 - (cups.length - index )*12.5
                    // console.log(current)
                }else {
                    // 在这之前的全部填满
                    for(let i=0;i<=index;i++){
                        cups[i].classList.add('full')
                    }
                    current = 12.5 * (index + 1)
                }

                empty.style.height = (100 - current) + '%'

                // 空
                if(current === 0){
                    water.classList.add('hidden')
                    empty.classList.remove('hidden')
                }else if(current === 100){
                    empty.classList.add('hidden')
                    water.classList.remove('hidden')
                }else {
                    water.classList.remove('hidden')
                    empty.classList.remove('hidden')
                }

                empty.innerHTML = `${2 - 2 * current / 100}L`
                water.innerHTML = `${current} %`
            })
        })


    </script>

</body>
</html>