<form class="newsletter-form">
    <input type="email" placeholder="Email address" />
    <button>
        <span class="default">Subscribe</span>
        <span class="success">
            <svg viewBox="0 0 16 16">
                <polyline points="3.75 9 7 12 13 5"></polyline>
            </svg>Done
        </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>
</form>

<!-- dribbble - twitter -->
<a class="dribbble" href="https://dribbble.com/ai" target="_blank"><img src="https://cdn.dribbble.com/assets/dribbble-ball-mark-2bd45f09c2fb58dbbfb44766d5d1d07c5a12972d602ef8b32204d28fa3dda554.svg" alt=""></a>
<a class="twitter" target="_top" 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>

.newsletter-form {
    --primary: #275EFE;
    --primary-dark: #2055EE;
    --primary-darkest: #133FC0;
    --input-placeholder: #A6ACCD;
    --input-text: #646B8C;
    --border-default: #E1E6F9;
    --border-active: #275EFE;
    --background: #fff;
    --button-text: #FFFFFF;
    --success: #275EFE;
    --trails: #{rgba(#275EFE, .15)};
    display: flex;
    align-items: center;
    max-width: 300px;
    width: 100%;
    background: var(--background);
    box-shadow: inset 0 0 0 var(--border-width, 1px) var(--border, var(--border-default));
    border-radius: 9px;
    padding-right: 4px;
    transition: box-shadow .25s;
    &:focus-within {
        --border-width: 1.5px;
        --border: var(--border-active);
    }
    input,
    button {
        -webkit-appearance: none;
        background: none;
        outline: none;
        display: block;
        border: none;
        font-family: inherit;
        font-size: 14px;
        line-height: 24px;
        margin: 0;
    }
    input {
        width: 100%;
        flex-grow: 1;
        padding: 12px 12px 12px 16px;
        color: var(--input-text);
        font-weight: 400;
        &::placeholder {
            color: var(--input-placeholder);
        }
    }
    button {
        --text-opacity: 1;
        --success-x: -12px;
        --success-stroke: 14px;
        --success-opacity: 0;
        --border-radius: 7px;
        --overflow: hidden;
        --x: 0px;
        --y: 0px;
        --rotate: 0deg;
        --plane-x: 0px;
        --plane-y: 0px;
        --plane-opacity: 1;
        --trails-stroke: 57px;
        --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: 50%;
        --left-body-first-y: 0%;
        --left-body-second-x: 50%;
        --left-body-second-y: 100%;
        --left-body-third-x: 0%;
        --left-body-third-y: 100%;
        --right-wing-background: var(--primary);
        --right-wing-first-x: 50%;
        --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: 50%;
        --right-body-first-y: 0%;
        --right-body-second-x: 50%;
        --right-body-second-y: 100%;
        --right-body-third-x: 100%;
        --right-body-third-y: 100%;
        position: relative;
        padding: 8px 0;
        min-width: 100px;
        text-align: center;
        font-weight: 600;
        opacity: var(--button-opacity, .5);
        cursor: var(--button-cursor, not-allowed);
        filter: var(--button-filter, grayscale(65%));
        color: var(--button-text);
        border-radius: var(--border-radius);
        transform: translateZ(0);
        transition: opacity .25s, filter .25s;
        -webkit-tap-highlight-color: transparent;
        &:not(.active) {
            background: var(--primary);
        }
        .plane,
        .trails {
            pointer-events: none;
            position: absolute;
        }
        .plane {
            left: 0;
            top: 0;
            right: 0;
            bottom: 0;
            transform:  translate(var(--x), var(--y)) rotate(var(--rotate)) translateZ(0);
            .left,
            .right {
                position: absolute;
                left: 0;
                top: 0;
                right: 0;
                bottom: 0;
                opacity: var(--plane-opacity);
                transform: translate(var(--plane-x), var(--plane-y)) translateZ(0);
                &:before,
                &:after {
                    content: '';
                    position: absolute;
                    left: 0;
                    top: 0;
                    right: 0;
                    bottom: 0;
                    border-radius: var(--border-radius);
                    transform: translate(var(--part-x, .25%), var(--part-y, 0)) translateZ(0);
                    z-index: var(--z-index, 2);
                    background: var(--b, var(--left-wing-background));
                    clip-path: polygon(var(--first-x, var(--left-wing-first-x)) var(--first-y, var(--left-wing-first-y)), var(--second-x, var(--left-wing-second-x)) var(--second-y, var(--left-wing-second-y)), var(--third-x, var(--left-wing-third-x)) var(--third-y, var(--left-wing-third-y)));
                }
            }
            .left:after {
                --part-x: 0;
                --z-index: 1;
                --b: 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: -.25%;
                --z-index: 2;
                --b: 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;
                --b: 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: var(--trails-stroke);
            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(var(--success-x)) 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: var(--success-stroke);
                }
            }
        }
    }
    &.valid {
        --button-opacity: 1;
        --button-cursor: pointer;
        --button-filter: grayscale(0%);
    }
}

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

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

// Center & dribbble
body {
    min-height: 100vh;
    display: flex;
    font-family: 'Inter', Arial;
    justify-content: center;
    align-items: center;
    background: #F6F8FF;
    .dribbble {
        position: fixed;
        display: block;
        right: 20px;
        bottom: 20px;
        img {
            display: block;
            height: 28px;
        }
    }
    .twitter {
        position: fixed;
        display: block;
        right: 64px;
        bottom: 14px;
        svg {
            width: 32px;
            height: 32px;
            fill: #1da1f2;
        }
    }
}

const { to, fromTo, set } = gsap

function validateEmail(email) {
    const re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
    return re.test(String(email).toLowerCase())
}

document.querySelectorAll('.newsletter-form').forEach(form => {

    let input = form.querySelector('input'),
        button = form.querySelector('button'),
        getVar = variable => getComputedStyle(button).getPropertyValue(variable)

    input.addEventListener('input', e => {
        form.classList.toggle('valid', validateEmail(input.value))
    })

    form.addEventListener('submit', e => {

        e.preventDefault()

        if(!validateEmail(input.value)) {
            input.focus()
            return
        }

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

            button.classList.add('active')

            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() {
                        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': '50deg',
                    '--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': '60deg',
                    '--plane-x': '-8px',
                    '--plane-y': '40px',
                    duration: .2
                }, {
                    '--rotate': '40deg',
                    '--plane-x': '45px',
                    '--plane-y': '-300px',
                    '--plane-opacity': 0,
                    duration: .375,
                    onComplete() {
                        setTimeout(() => {
                            button.removeAttribute('style')
                            fromTo(button, {
                                opacity: 0,
                                y: -8
                            }, {
                                opacity: 1,
                                y: 0,
                                clearProps: true,
                                duration: .3,
                                onComplete() {
                                    button.classList.remove('active')
                                }
                            })
                        }, 2500)
                    }
                }]
            })

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

        }

    })

})