<button class="button">
    <span class="default">Absenden</span>
    <span class="success">
        <svg viewBox="0 0 16 16">
            <polyline points="3.75 9 7 12 13 5"></polyline>
        </svg>Sent
    </span>
    <svg class="trails" viewBox="0 0 33 64">
        <path d="M26,4 C28,13.3333333 29,22.6666667 29,32 C29,41.3333333 28,50.6666667 26,60"></path>
        <path d="M6,4 C8,13.3333333 9,22.6666667 9,32 C9,41.3333333 8,50.6666667 6,60"></path>
    </svg>
    <div class="plane">
        <div class="left"></div>
        <div class="right"></div>
    </div>
</button>

<!-- twitter / dribbble -->
<a class="dribbble" href="https://dribbble.com/ai" target="_blank"><img src="https://dribbble.com/assets/logo-small-2x-9fe74d2ad7b25fba0f50168523c15fda4c35534f9ea0b1011179275383035439.png" alt=""></a>
<a class="twitter" target="_blank" href="https://twitter.com/aaroniker_me"><svg xmlns="http://www.w3.org/2000/svg" width="72" height="72" viewBox="0 0 72 72"><path d="M67.812 16.141a26.246 26.246 0 0 1-7.519 2.06 13.134 13.134 0 0 0 5.756-7.244 26.127 26.127 0 0 1-8.313 3.176A13.075 13.075 0 0 0 48.182 10c-7.229 0-13.092 5.861-13.092 13.093 0 1.026.118 2.021.338 2.981-10.885-.548-20.528-5.757-26.987-13.679a13.048 13.048 0 0 0-1.771 6.581c0 4.542 2.312 8.551 5.824 10.898a13.048 13.048 0 0 1-5.93-1.638c-.002.055-.002.11-.002.162 0 6.345 4.513 11.638 10.504 12.84a13.177 13.177 0 0 1-3.449.457c-.846 0-1.667-.078-2.465-.231 1.667 5.2 6.499 8.986 12.23 9.09a26.276 26.276 0 0 1-16.26 5.606A26.21 26.21 0 0 1 4 55.976a37.036 37.036 0 0 0 20.067 5.882c24.083 0 37.251-19.949 37.251-37.249 0-.566-.014-1.134-.039-1.694a26.597 26.597 0 0 0 6.533-6.774z"></path></svg></a>

.button {
    --primary: #F6F8FF;
    --primary-dark: #D1D6EE;
    --primary-darkest: #8A91B4;
    --shadow: #{rgba(#000, .3)};
    --text: #362A89;
    --text-opacity: 1;
    --success: #EEECFF;
    --success-x: -12;
    --success-stroke: 14;
    --success-opacity: 0;
    --border-radius: 7;
    --overflow: hidden;
    --x: 0;
    --y: 0;
    --rotate: 0;
    --plane-x: 0;
    --plane-y: 0;
    --plane-opacity: 1;
    --trails: #{rgba(#fff, .15)};
    --trails-stroke: 57;
    --left-wing-background: var(--primary);
    --left-wing-first-x: 0;
    --left-wing-first-y: 0;
    --left-wing-second-x: 50;
    --left-wing-second-y: 0;
    --left-wing-third-x: 0;
    --left-wing-third-y: 100;
    --left-body-background: var(--primary);
    --left-body-first-x: 51;
    --left-body-first-y: 0;
    --left-body-second-x: 51;
    --left-body-second-y: 100;
    --left-body-third-x: 0;
    --left-body-third-y: 100;
    --right-wing-background: var(--primary);
    --right-wing-first-x: 49;
    --right-wing-first-y: 0;
    --right-wing-second-x: 100;
    --right-wing-second-y: 0;
    --right-wing-third-x: 100;
    --right-wing-third-y: 100;
    --right-body-background: var(--primary);
    --right-body-first-x: 49;
    --right-body-first-y: 0;
    --right-body-second-x: 49;
    --right-body-second-y: 100;
    --right-body-third-x: 100;
    --right-body-third-y: 100;
    display: block;
    cursor: pointer;
    position: relative;
    border: 0;
    padding: 8px 0;
    min-width: 100px;
    text-align: center;
    margin: 0;
    line-height: 24px;
    font-family: inherit;
    font-weight: 600;
    font-size: 14px;
    background: none;
    outline: none;
    color: var(--text);
    -webkit-appearance: none;
    -webkit-tap-highlight-color: transparent;
    .plane,
    .trails {
        pointer-events: none;
        position: absolute;
    }
    .plane {
        left: 0;
        top: 0;
        right: 0;
        bottom: 0;
        filter: drop-shadow(0 3px 6px var(--shadow));
        transform:  translate(calc(var(--x) * 1px), calc(var(--y) * 1px)) rotate(calc(var(--rotate) * 1deg)) translateZ(0);
        .left,
        .right {
            position: absolute;
            left: 0;
            top: 0;
            right: 0;
            bottom: 0;
            opacity: var(--plane-opacity);
            transform: translate(calc(var(--plane-x) * 1px), calc(var(--plane-y) * 1px)) translateZ(0);
            &:before,
            &:after {
                content: '';
                position: absolute;
                left: 0;
                top: 0;
                right: 0;
                bottom: 0;
                border-radius: calc(var(--border-radius) * 1px);
                transform: translate(var(--part-x, .4%), var(--part-y, 0)) translateZ(0);
                z-index: var(--z-index, 2);
                background: var(--background, var(--left-wing-background));
                clip-path: polygon(calc(var(--first-x, var(--left-wing-first-x)) * 1%) calc(var(--first-y, var(--left-wing-first-y)) * 1%), calc(var(--second-x, var(--left-wing-second-x)) * 1%) calc(var(--second-y, var(--left-wing-second-y)) * 1%), calc(var(--third-x, var(--left-wing-third-x)) * 1%) calc(var(--third-y, var(--left-wing-third-y)) * 1%));
            }
        }
        .left:after {
            --part-x: -1%;
            --z-index: 1;
            --background: var(--left-body-background);
            --first-x: var(--left-body-first-x);
            --first-y: var(--left-body-first-y);
            --second-x: var(--left-body-second-x);
            --second-y: var(--left-body-second-y);
            --third-x: var(--left-body-third-x);
            --third-y: var(--left-body-third-y);
        }
        .right:before {
            --part-x: -1%;
            --z-index: 2;
            --background: var(--right-wing-background);
            --first-x: var(--right-wing-first-x);
            --first-y: var(--right-wing-first-y);
            --second-x: var(--right-wing-second-x);
            --second-y: var(--right-wing-second-y);
            --third-x: var(--right-wing-third-x);
            --third-y: var(--right-wing-third-y);
        }
        .right:after {
            --part-x: 0;
            --z-index: 1;
            --background: var(--right-body-background);
            --first-x: var(--right-body-first-x);
            --first-y: var(--right-body-first-y);
            --second-x: var(--right-body-second-x);
            --second-y: var(--right-body-second-y);
            --third-x: var(--right-body-third-x);
            --third-y: var(--right-body-third-y);
        }
    }
    .trails {
        display: block;
        width: 33px;
        height: 64px;
        top: -4px;
        left: 16px;
        fill: none;
        stroke: var(--trails);
        stroke-linecap: round;
        stroke-width: 2;
        stroke-dasharray: 57px;
        stroke-dashoffset: calc(var(--trails-stroke) * 1px);
        transform: rotate(68deg) translateZ(0);
    }
    span {
        display: block;
        position: relative;
        z-index: 4;
        opacity: var(--text-opacity);
        &.success {
            z-index: 0;
            position: absolute;
            left: 0;
            right: 0;
            top: 8px;
            transform: translateX(calc(var(--success-x) * 1px)) translateZ(0);
            opacity: var(--success-opacity);
            color: var(--success);
            svg {
                display: inline-block;
                vertical-align: top;
                width: 16px;
                height: 16px;
                margin: 4px 8px 0 0;
                fill: none;
                stroke-width: 2;
                stroke-linecap: round;
                stroke-linejoin: round;
                stroke-dasharray: 14px;
                stroke: var(--success);
                stroke-dashoffset: calc(var(--success-stroke) * 1px)
            }
        }
    }
}

html {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

* {
    box-sizing: inherit;
    &:before,
    &:after {
        box-sizing: inherit;
    }
}

// dribbble & twitter
body {
    overflow: hidden;
    min-height: 100vh;
    font-family: 'Inter';
    display: flex;
    justify-content: center;
    align-items: center;
    background: #362A89;
    .dribbble {
        position: fixed;
        display: block;
        right: 20px;
        bottom: 20px;
        img {
            display: block;
            width: 76px;
        }
    }
    .twitter {
        position: fixed;
        display: block;
        right: 112px;
        bottom: 14px;
        svg {
            width: 24px;
            height: 24px;
            fill: white;
        }
    }
}

document.querySelectorAll('.button').forEach(button => {

    let getVar = variable => getComputedStyle(button).getPropertyValue(variable);

    button.addEventListener('click', e => {

        if(!button.classList.contains('active')) {

            button.classList.add('active');

            gsap.to(button, {
                keyframes: [{
                    '--left-wing-first-x': 50,
                    '--left-wing-first-y': 100,
                    '--right-wing-second-x': 50,
                    '--right-wing-second-y': 100,
                    duration: .2,
                    onComplete() {
                        gsap.set(button, {
                            '--left-wing-first-y': 0,
                            '--left-wing-second-x': 40,
                            '--left-wing-second-y': 100,
                            '--left-wing-third-x': 0,
                            '--left-wing-third-y': 100,
                            '--left-body-third-x': 40,
                            '--right-wing-first-x': 50,
                            '--right-wing-first-y': 0,
                            '--right-wing-second-x': 60,
                            '--right-wing-second-y': 100,
                            '--right-wing-third-x': 100,
                            '--right-wing-third-y': 100,
                            '--right-body-third-x': 60
                        })
                    }
                }, {
                    '--left-wing-third-x': 20,
                    '--left-wing-third-y': 90,
                    '--left-wing-second-y': 90,
                    '--left-body-third-y': 90,
                    '--right-wing-third-x': 80,
                    '--right-wing-third-y': 90,
                    '--right-body-third-y': 90,
                    '--right-wing-second-y': 90,
                    duration: .2
                }, {
                    '--rotate': 50,
                    '--left-wing-third-y': 95,
                    '--left-wing-third-x': 27,
                    '--right-body-third-x': 45,
                    '--right-wing-second-x': 45,
                    '--right-wing-third-x': 60,
                    '--right-wing-third-y': 83,
                    duration: .25
                }, {
                    '--rotate': 60,
                    '--plane-x': -8,
                    '--plane-y': 40,
                    duration: .2
                }, {
                    '--rotate': 40,
                    '--plane-x': 45,
                    '--plane-y': -300,
                    '--plane-opacity': 0,
                    duration: .375,
                    onComplete() {
                        setTimeout(() => {
                            button.removeAttribute('style');
                            gsap.fromTo(button, {
                                opacity: 0,
                                y: -8
                            }, {
                                opacity: 1,
                                y: 0,
                                clearProps: true,
                                duration: .3,
                                onComplete() {
                                    button.classList.remove('active');
                                }
                            })
                        }, 1800)
                    }
                }]
            })

            gsap.to(button, {
                keyframes: [{
                    '--text-opacity': 0,
                    '--border-radius': 0,
                    '--left-wing-background': getVar('--primary-dark'),
                    '--right-wing-background': getVar('--primary-dark'),
                    duration: .11
                }, {
                    '--left-wing-background': getVar('--primary'),
                    '--right-wing-background': getVar('--primary'),
                    duration: .14
                }, {
                    '--left-body-background': getVar('--primary-dark'),
                    '--right-body-background': getVar('--primary-darkest'),
                    duration: .25,
                    delay: .1
                }, {
                    '--trails-stroke': 171,
                    duration: .22,
                    delay: .22
                }, {
                    '--success-opacity': 1,
                    '--success-x': 0,
                    duration: .2,
                    delay: .15
                }, {
                    '--success-stroke': 0,
                    duration: .15
                }]
            })

        }

    })

});