<section class="section">
  <div>
    <h1>Reveal Sections on Scroll</h1>
    <p>GSAP & ScrollTrigger - <span>right-to-left horizontal animation</span></p>
    <p>👇 Scroll down</p>
  </div>
</section>
<section class="section-slides">
  <div class="slides">
    <div class="slide">
      <figure>
        <img width="1920" height="1280" src="https://assets.codepen.io/162656/gallery-edinburgh.jpg" alt="edinburgh" />
        <figcaption>
          <h2 class="heading">Edinburgh</h2>
        </figcaption>
      </figure>
    </div>
    <div class="slide">
      <figure>
        <img width="1920" height="1005" src="https://assets.codepen.io/162656/gallery-berlin.jpg" alt="berlin" />
        <figcaption>
          <h2 class="heading">Berlin</h2>
        </figcaption>
      </figure>
    </div>
    <div class="slide">
      <figure>
        <img width="1920" height="1282" src="https://assets.codepen.io/162656/gallery-havana.jpg" alt="havana" />
        <figcaption>
          <h2 class="heading">Havana</h2>
        </figcaption>
      </figure>
    </div>
    <div class="slide">
      <figure>
        <img width="1920" height="1279" src="https://assets.codepen.io/162656/gallery-london.jpg" alt="london" />
        <figcaption>
          <h2 class="heading">London</h2>
        </figcaption>
      </figure>
    </div>
    <div class="slide">
      <figure>
        <img width="1920" height="1439" src="https://assets.codepen.io/162656/gallery-athens.jpg" alt="athens" />
        <figcaption>
          <h2 class="heading">Athens</h2>
        </figcaption>
      </figure>
    </div>
    <div class="slide">
      <figure>
        <img width="1920" height="1281" src="https://assets.codepen.io/162656/gallery-vienna.jpg" alt="vienna" />
        <figcaption>
          <h2 class="heading">Vienna</h2>
        </figcaption>
      </figure>
    </div>
  </div>
</section>
<section class="section">
  <h2>Thank you!</h2>
</section>

<footer class="page-footer">
  <span>made by </span>
  <a href="https://georgemartsoukos.com/" target="_blank">
    <img width="24" height="24" src="https://assets.codepen.io/162656/george-martsoukos-small-logo.svg" alt="George Martsoukos logo">
  </a>
</footer>

/* BASIC STYLES
–––––––––––––––––––––––––––––––––––––––––––––––––– */
@import url("https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,100..900;1,100..900&display=swap");

* {
  box-sizing: border-box;
}

body {
  font-family: "Montserrat", sans-serif;
  margin: 0;
}

.section {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 15px;
  height: 100vh;
  text-align: center;
  color: white;
  background: #003049;
}

.section span {
  text-decoration: underline;
}

.section-slides {
  margin-top: -1px;
}

/* MAIN STYLES
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.slides {
  display: grid;
  overflow: hidden;
}

.slide {
  grid-area: 1/1;
}

.slide figure {
  margin: 0;
  position: relative;
  height: 100vh;
}

.slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #f1faee;
}

.slide figcaption {
  display: flex;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  align-items: center;
  background: rgba(0, 0, 0, 0.15);
}

.slide .heading {
  display: inline-block;
  padding: 5px 15px;
  text-align: center;
  font-size: clamp(2.5rem, 2vh, 5rem);
  line-height: 1;
  font-weight: bold;
  color: #d62828;
  background: #fcbf49;
  transform: rotate(-90deg) translateX(-50%);
  transform-origin: left top;
}

/* FOOTER STYLES
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.page-footer {
  position: fixed;
  right: 0;
  bottom: 50px;
  display: flex;
  align-items: center;
  padding: 5px;
  z-index: 1;
  font-size: 14px;
  background: white;
}

.page-footer a {
  display: flex;
  margin-left: 4px;
}

gsap.set(".slide:not(:first-child)", { xPercent: 100 });
gsap.set(".slide .heading", { opacity: 0 });

const tl = gsap.timeline();
tl.to(".slide:not(:first-child)", {
  ease: "none",
  xPercent: 0,
  stagger: 1,
  duration: 1
}).to(
  ".slide .heading",
  {
    opacity: 1,
    duration: 1,
    stagger: 1
  },
  "<"
);

ScrollTrigger.create({
  trigger: ".slides",
  start: "top top",
  end: "+=500%",
  scrub: true,
  pin: true,
  animation: tl
  //markers: true
});