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HTML

              
                <a href="https://youtu.be/UbOCO7TOl00" target="_blank" data-keyframers-credit style="color: #FFF"></a>
<script src="https://codepen.io/shshaw/pen/QmZYMG.js"></script>

<div id="app" data-current-planet="mercury">

  <nav class="planet-nav">
    <svg viewBox="0 20 400 400" xmlns="http://www.w3.org/2000/svg">

<!--       <defs> -->
        <path 
            id="navPath" 
            d="M10,200 C30,-28 370,-28 390,200"
            fill="none" />
<!--       </defs> -->

      <text>
        <textPath href="#navPath" startOffset="0" font-size="10">
          <tspan>Mercury</tspan>
          <tspan>Venus</tspan>
          <tspan>Earth</tspan>
          <tspan>Mars</tspan>
          <tspan>Jupiter</tspan>
          <tspan>Saturn</tspan>
          <tspan>Uranus</tspan>
          <tspan>Neptune</tspan>
        </textPath>
      </text>

    </svg>
  </nav>

  <div class="planet" data-planet="mercury" data-active>
    <div class="planet-title">
      <h1>Mercury</h1>
      <p class="planet-description">Tiny and close to the sun.</p>
    </div>

    <div class="planet-details">
      <div class="detail" data-detail="tilt" data-postfix="°">
        3.13
      </div>
      <div class="detail" data-detail="gravity" data-postfix="𝗑">
        0.9
      </div>
      <div class="detail" data-detail="hours">
        10
      </div>
    </div>

    <figure class="planet-figure">
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/t-1188/1_mercury.jpg" />
    </figure>
  </div>

  <div class="planet" data-planet="venus">
    <div class="planet-title">
      <h1>Venus</h1>
      <p class="planet-description">A planet of razors and tennis players.</p>
    </div>

    <div class="planet-details">
      <div class="detail" data-detail="tilt" data-postfix="°">
        4.13
      </div>
      <div class="detail" data-detail="gravity" data-postfix="𝗑">
        0.2
      </div>
      <div class="detail" data-detail="hours">
        20
      </div>
    </div>

    <figure class="planet-figure">
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/t-1188/2_venus.jpg" />
    </figure>
  </div>

  <div class="planet" data-planet="earth">
    <div class="planet-title">
      <h1>Earth</h1>
      <p class="planet-description">Voted best planet in the Solar System by all organisms.</p>
    </div>

    <div class="planet-details">
      <div class="detail" data-detail="tilt" data-postfix="°">
        5.13
      </div>
      <div class="detail" data-detail="gravity" data-postfix="𝗑">
        7.3
      </div>
      <div class="detail" data-detail="hours">
        30
      </div>
    </div>

    <figure class="planet-figure">
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/t-1188/3_earth.jpg" />
    </figure>
  </div>

  <div class="planet" data-planet="mars">
    <div class="planet-title">
      <h1>Mars</h1>
      <p class="planet-description">Future Site of Elon Musk's AirBnB.</p>
    </div>

    <div class="planet-details">
      <div class="detail" data-detail="tilt" data-postfix="°">
        6.13
      </div>
      <div class="detail" data-detail="gravity" data-postfix="𝗑">
        1.1
      </div>
      <div class="detail" data-detail="hours">
        40
      </div>
    </div>

    <figure class="planet-figure">
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/t-1188/4_mars.jpg" />
    </figure>
  </div>

  <div class="planet" data-planet="jupiter">
    <div class="planet-title">
      <h1>Jupiter</h1>
      <p class="planet-description">Twice as massive as the other planets combined.</p>
    </div>

    <div class="planet-details">
      <div class="detail" data-detail="tilt" data-postfix="°">
        11.13
      </div>
      <div class="detail" data-detail="gravity" data-postfix="𝗑">
        1.8
      </div>
      <div class="detail" data-detail="hours">
        50
      </div>
    </div>

    <figure class="planet-figure">
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/t-1188/5_jupiter.jpg" />
    </figure>
  </div>

  <div class="planet" data-planet="saturn">
    <div class="planet-title">
      <h1>Saturn</h1>
      <p class="planet-description">This planet sponsored by Zales.</p>
    </div>

    <div class="planet-details">
      <div class="detail" data-detail="tilt" data-postfix="°">
        9.13
      </div>
      <div class="detail" data-detail="gravity" data-postfix="𝗑">
        7.3
      </div>
      <div class="detail" data-detail="hours">
        60
      </div>
    </div>

    <figure class="planet-figure">
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/t-1188/6_saturn.jpg" />
    </figure>
  </div>

  <div class="planet" data-planet="uranus">
    <div class="planet-title">
      <h1>Uranus</h1>
      <p class="planet-description">Hey, stop laughing. It's not funny.</p>
    </div>

    <div class="planet-details">
      <div class="detail" data-detail="tilt" data-postfix="°">
        11.13
      </div>
      <div class="detail" data-detail="gravity" data-postfix="𝗑">
        1.8
      </div>
      <div class="detail" data-detail="hours">
        50
      </div>    </div>

    <figure class="planet-figure">
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/t-1188/7_uranus.jpg" />
    </figure>
  </div>


  <div class="planet" data-planet="neptune">
    <div class="planet-title">
      <h1>Neptune</h1>
      <p class="planet-description">A planet for pirates; just narrowly made the cut when scientists decided nine planets was too many.</p>
    </div>

    <div class="planet-details">
      <div class="detail" data-detail="tilt" data-postfix="°">
        31.03      </div>
      <div class="detail" data-detail="gravity" data-postfix="𝗑">
        8.9      </div>
      <div class="detail" data-detail="hours">
        10
      </div>
    </div>

    <figure class="planet-figure">
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/t-1188/8_neptune.jpg" />
    </figure>
  </div>
</div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=DM+Sans:400,700&display=swap');

:root {
  --duration: .8s;
  --half-duraiton: calc( var(--duration) / 2 );
  --ease: cubic-bezier(.7, 0, .3, 1);
}

*, *:before, *:after {
  box-sizing: border-box;
  position: relative;
}

html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
}

body {
  background: black;
  color: white;
  font-family: 'DM Sans', sans-serif;
}

img { max-width: 100%; }

// ---------------------

#app {
  height: 100%;
  width: 100%;

  display: grid;
  grid-template-columns: 1;
  grid-template-rows: 1fr 1fr;
}

.planet {
  grid-column: 1;
  grid-row: 1 / -1;
  overflow: hidden;
  height: 100%;
  width: 100%;
  display: grid;
  grid-template-columns: 10% 40% 40% 10%;
  grid-template-rows: 10% 1fr 1fr;
  grid-template-areas: 
    "header header header header"
    "x title details y"
    "x planet photos photos";

  > .planet-title {
    display: block;
    grid-area: title;
  }

  > .planet-figure {
    grid-column: 1 / -1;
    grid-row: planet; 
    padding: 0;
    margin: 0 auto;
    position: relative;
    
    img { 
      margin-bottom: -50%;
    }

    &::after {
      content: '';
      position: fixed;
      bottom: 0%;
      top: 0%;
      width: 100%;
      left: 0;
      background: linear-gradient(to top, rgba(#000,.7) 0%, transparent 30%);
      z-index: 2;
    }
  }

  > .planet-details {
    grid-area: details;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
  }

}

.detail {
  font-size: 5vmin;
  width: 3em;
  font-weight: 400;
  display: flex;
  margin-left: .4em;
  flex-shrink: 0;
  align-self: start;

  &:after {
    content: attr(data-postfix); 
  }

  &:before {
    display: block;
    position: absolute;
    top: 100%;
    margin-top: 1rem;
    font-size: .75rem;
    text-transform: uppercase;
    opacity: 0.6;
    letter-spacing: 1px;
  }

  &[data-detail="hours"]:before {
    content: 'Hours'
  }

  &[data-detail="gravity"]:before {
    content: 'gravity'
  }
  &[data-detail="tilt"]:before {
    content: 'tilt'
  }
}

h1, h2 {
  margin: 0;
}

/* ---------------------------------- */

.planet {
  visibility: hidden;
  // opacity: 0;
  transition: visibility 0.01s linear var(--duration);

  // > * { transition: opacity var(--duration) var(--ease); }

  &[data-active] {
    visibility: visible;
    opacity: 1;
    transition-delay: 0s;
  }
  
  /* ---------------------------------- */

  .planet-title {
    .word { overflow: hidden; }
    .char { 
      transform: translateY(100%);
      transition: transform var(--duration) var(--ease);
      transition-delay: calc( var(--char-index) * .1s );
    }
  }

  &[data-active] {
    .planet-title .char {
      transform: translateY(0%);
      transition-delay: calc(
        (var(--duration)/2) + 
        (var(--char-index) * .1s)
      );   
    }
  }
  
  /* ---------------------------------- */
  
  .planet-description {
    visibility: hidden;
    opacity: 0;
    transform: translateY(1em);
    transition: 
      transform var(--duration) var(--ease),
      opacity var(--duration) linear, 
      visibility 0.01s linear var(--duration);
  }
  
  
  &[data-active] {
    .planet-description {
      opacity: 1;
      transform: translateY(0);
      visibility: visible;
      transition-delay: 
        var(--duration), 
        var(--duration),
        0s;
    }
  }
  
  /* ---------------------------------- */

  .planet-details {
    visibility: hidden;
  }

  &[data-active] {
    .planet-details {
      opacity: 1;
      transform: translateY(0);
      visibility: visible;
      transition-delay: 0s;
    }
  }

  .planet-figure {
    opacity: 0;
    transition: opacity var(--duration) var(--ease);
  }

  &[data-active] {
    .planet-figure {
      opacity: 1;
    }
  }

}

/* ---------------------------------- */

#app { overflow: hidden; }

.planet-nav {
  grid-column: 1;
  grid-row: 2;
  pointer-events: none;
  z-index: 10;
  display: flex;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;

  svg { 
    display: block; 
    width: auto;
    height: auto;
    min-width: 100%;
    max-width: none;
    min-height: 100vh;
    margin-bottom: -50%;
    @media (max-width: 600px) {
      margin-bottom: -55%;
    }
  }

  tspan {
    cursor: pointer;
    fill: #FFF;
    pointer-events: auto;
    opacity: 0;
    transition: opacity var(--duration) linear; 

    &[x] {
      opacity: 0.6;
    }

    &:hover,
    &:focus {
      opacity: 1;
    }
  }

  svg {
    // border: solid 1px red;
    transform-origin: center center;
    --length: 7;
    --range: 160deg;

    transform: rotate( calc( 
      (var(--active,0) / var(--length))
      * (-1 * var(--range))
      + (var(--range) / 2)
    ));

    transition: transform var(--duration) var(--ease);
  }

  tspan { cursor: pointer; }
}

              
            
!

JS

              
                console.clear();

Splitting({ target: '.planet-title h1', by: 'chars' });

const elApp = document.querySelector('#app');

const elPlanets = Array.from(document.querySelectorAll('[data-planet]'))
  .reduce((acc, el) => {
    const planet = el.dataset.planet;
    
    acc[planet] = el;
    
    return acc;
  }, {});

const planetKeys = Object.keys(elPlanets);

function getDetails(planet) {
  // tilt, gravity, hours
  const details = Array.from(elPlanets[planet]
    .querySelectorAll(`[data-detail]`))
    .reduce((acc, el) => {
      acc[el.dataset.detail] = el.innerHTML.trim();
      
      return acc;
    }, { planet });
  
  return details;
}

// ...........

let currentPlanetIndex = 0;
let currentPlanet = getDetails('mercury');

function selectPlanet(planet) {
  const prevPlanet = currentPlanet;
  const elActive = document.querySelector('[data-active]');
  
  delete elActive.dataset.active;
  
  const elPlanet = elPlanets[planet];
  
  elPlanet.dataset.active = true;
  currentPlanet = getDetails(elPlanet.dataset.planet)
  
  console.log(prevPlanet, currentPlanet);
  
  const elHoursDetail = elPlanet.querySelector('[data-detail="hours"]')
  animate.fromTo({
    from: +prevPlanet.hours,
    to: +currentPlanet.hours
  }, value => {
    elHoursDetail.innerHTML = Math.round(value);
  })
  
  const elTiltDetail = elPlanet.querySelector('[data-detail="tilt"]')
  animate.fromTo({
    from: +prevPlanet.tilt,
    to: +currentPlanet.tilt
  }, value => {
    elTiltDetail.innerHTML = (value).toFixed(2);
  })
  
  const elGravityDetail = elPlanet.querySelector('[data-detail="gravity"]')
  
  animate.fromTo({
    from: +prevPlanet.gravity,
    to: +currentPlanet.gravity
  }, value => {
    elGravityDetail.innerHTML = (value).toFixed(1);
  })
}

function selectPlanetByIndex(i) {
  currentPlanetIndex = i;
  elApp.style.setProperty('--active',i);
  selectPlanet(planetKeys[i]);
}

// document.body.addEventListener('click', () => {
//   currentPlanetIndex = (currentPlanetIndex + 1) % planetKeys.length;
  
//   selectPlanet(planetKeys[currentPlanetIndex]);
// });


/* ---------------------------------- */

function animate(duration, fn) {
  const start = performance.now();
  const ticks = Math.ceil(duration / 16.666667);
  let progress = 0; // between 0 and 1, +/-
  
  function tick(now) {
    if (progress >= 1) {
      fn(1);
      return;
    }
    
    const elapsed = now - start;
    progress = elapsed / duration;
    
    // callback
    fn(progress); // number between 0 and 1
    
    requestAnimationFrame(tick); // every 16.6666667 ms
  }
  
  tick(start);
}

function easing(progress) {
  return (1 - Math.cos(progress * Math.PI)) / 2
}

const animationDefaults = {
  duration: 1000,
  easing
}

animate.fromTo = ({
  from,
  to,
  easing,
  duration
}, fn) => {
  easing = easing || animationDefaults.easing;
  duration = duration || animationDefaults.duration;
  
  const delta = +to - +from;
  
  return animate(duration, progress => fn(from + easing(progress) * delta));
}


/* ---------------------------------- */

const svgNS = 'http://www.w3.org/2000/svg';
const elSvgNav = document.querySelector('.planet-nav svg');

const elTspans = [...document.querySelectorAll('tspan')];;
const length = elTspans.length - 1;

elSvgNav.style.setProperty('--length',length);

// Getting the length for distributing the text along the path
const elNavPath = document.querySelector('#navPath');
const elLastTspan =  elTspans[length];
const navPathLength = elNavPath.getTotalLength() - elLastTspan.getComputedTextLength();

elTspans.forEach( (tspan,i) => {
  let percent = i / length;
  
  tspan.setAttribute('x', percent * navPathLength);
  tspan.setAttributeNS(svgNS, 'x', percent * navPathLength);
  
  tspan.addEventListener('click', (e)=>{
    e.preventDefault();
    selectPlanetByIndex(i);
  });
  
});

              
            
!
999px

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