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CSS

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HTML 

              
                <div id="root"></div>
!

CSS 

              
                video,
img {
  position: absolute;
  left: 0;
  top: 0;

  width: 100%;
  height: 100%;
  object-fit: cover;
  will-change: transform;
}

.slides {
  width: 100%;
  height: 100vh;
  overflow: hidden;
  position: relative;
}

.slide {
  position: absolute;
  top: 0;
  width: 100%;
  height: 100vh;
  clip-path: polygon(0 100%, 100% 100%, 100% 100%, 0 100%);

  &:first-child {
    clip-path: polygon(0% 100%, 100% 100%, 100% 0%, 0% 0%);
  }

  a {
    position: relative;
    display: grid;
    height: 100vh;
    text-decoration: none;
    overflow: hidden;
  }
}

.outer,
.inner {
  width: 100%;
  height: 100%;
  overflow-y: hidden;
}

.container {
  display: grid;
  position: relative;
  height: 100vh;
  background-color: orange;
}

.slides,
.nav,
.bg {
  grid-area: 1 / 1;
}

.bg {
  position: relative;
  overflow: hidden;
  width: 100%;
  height: 100%;
  will-change: transform;
  perspective: 1px;
}

.nav {
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-self: center;
  justify-self: flex-start;
  list-style-type: none;

  > li {
    &:first-child {
      padding-left: 24px;

      @media (min-width: 799px) {
        padding-left: 64px;
      }
    }

    button {
      display: inline-flex;
      align-items: center;
      cursor: pointer;
    }

    svg {
      width: 35px;
      margin-right: 12px;
      color: #fff;
      display: none;
    }

    h2 {
      color: blue;
      text-align: start;
    }

    &.is-active {
      svg {
        display: block;
      }
    }
  }
}

.line {
  width: 100%;
  height: 10px;
  position: absolute;
  top: 0;
  z-index: 1;
  display: inline-block;
  background-color: chocolate;
}

.menu {
  border: 1px solid red;
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  z-index: 1000;

  ul {
    display: flex;
    gap: 2em;
  }
}
!

JS 

              
                const { useEffect, useState, useRef } = React;

gsap.registerPlugin(ScrollToPlugin, ScrollTrigger);

const sliderArr = [
  {
    id: 1,
    href: "/",
    src:
      "https://images.unsplash.com/photo-1526409049865-5b0b188372f1?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1632&q=50",
    navTitle: "Slide 1"
  },
  {
    id: 2,
    href: "/",
    src:
      "https://images.unsplash.com/photo-1425913397330-cf8af2ff40a1?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1074&q=50",
    navTitle: "Slide 2"
  },
  {
    id: 3,
    href: "/",
    src:
      "https://images.unsplash.com/photo-1551986782-d0169b3f8fa7?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=688&q=50",
    navTitle: "Slide 3"
  },
  {
    id: 4,
    href: "/",
    src:
      "https://images.unsplash.com/photo-1608478497783-158b45d36042?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1470&q=50",
    navTitle: "Slide 4"
  }
];

function App() {
  const containerRef = useRef(null);
  const slidesWrapperRef = useRef(null);
  const slides = useRef([]);
  const navItems = useRef([]);
  const bg = useRef([]);
  const lineRef = useRef([]);
  const slidesTl = useRef();
  const duration = useRef(1);
  const [ctx] = useState(gsap.context(() => {}, containerRef));
  const [activeNavItem, setActiveNavItem] = useState(0);

  useEffect(() => {
    ctx.add(() => {
      // const slides = gsap.utils.toArray(".slide");

      let breakPoint = 800;
      let mm = gsap.matchMedia();

      slidesTl.current = gsap.timeline({
        id: "hero-animation",
        defaults: {
          ease: "none",
          duration: 1
        },
        scrollTrigger: {
          trigger: containerRef.current,
          pin: true, // locked the slidesWrapperRef div with position fixed
          start: "top top", // init slides at the top of the viewport
          end: `+=${sliderArr.length * 100}%`, // intead of using "bottom top" move end marker to the end of 3rd slide to slow down scroll animation

          scrub: true,
          invalidateOnRefresh: true, // to make it responsive
          markers: true
        }
      });

      // each slide
      slides.current.forEach((slide, index) => {
        // exclude the first slide
        // since we want to start animation from the second slide (index 1)
        if (index > 0) {
          if (!slidesTl.current) return;
          const position = duration.current / 2; // add active class at the center of the viewport

          console.log(bg.current[index - 1]);

          mm.add("(min-width: 799px)", () => {
            // this setup code only runs when viewport is at least 800px wide
            slidesTl.current
              .to(navItems.current[index - 1], { paddingLeft: 0 }, "<")
              .to(navItems.current[index], { paddingLeft: 50 }, "<");
          });

          mm.add("(max-width: 800px)", () => {
            // this setup code only runs when viewport is at least 800px wide
            slidesTl.current
              .to(navItems.current[index - 1], { paddingLeft: 0 })
              .to(navItems.current[index], { paddingLeft: 100 });
          });

          slidesTl.current
            .to(slide, {
              clipPath: "polygon(0% 100%, 100% 100%, 100% 0%, 0% 0%)"
            })
            .fromTo(
              bg.current[index - 1].firstElementChild,
              {
                y: 0
              },
              {
                y: () => -slide.offsetHeight * 0.3
              },
              "<"
            )
            .fromTo(
              bg.current[index].firstElementChild,
              {
                y: () => slide.offsetHeight * 0.3
              },
              {
                y: () => 0
              },
              "<"
            )
            .call(
              () => {
                const st = slidesTl.current?.scrollTrigger;
                //console.log(slidesTl.current?.scrollTrigger.progress);
                if (st && st.direction !== undefined) {
                  const _d = st.direction;
                  setActiveNavItem(index + (_d > 0 ? 0 : _d));
                }
              },
              undefined,
              `-=${String(position)}`
            )
            .fromTo(
              lineRef.current[index],
              {
                value: 0
              },
              {
                value: 100,
                ease: "none"
              },
              "<"
            );
        }

        // ScrollTrigger.create({
        //   trigger: slide,
        //   start: "top center",
        //   end: "bottom center",
        //   markers: true
        // });
      });
    });

    return () => {
      ctx.revert();
    };
  }, []);

  const slideToSection = (index) => {
    const navItemsCount = navItems.current.length - 1;
    const st = slidesTl.current?.scrollTrigger;

    if (st && st.start !== undefined && st.end !== undefined) {
      // calculate the y-coordinate based on the scrollTrigger
      const y = st.start + (st.end - st.start) * ((1 / navItemsCount) * index);
      console.log({ navItemsCount, index });

      gsap.to(window, {
        scrollTo: { y },
        duration: duration.current
      });
    }
  };

  return (
    <>
      <header className="menu">
        <div className="inner-menu">
          <ul>
            <li>item 1</li>
            <li>item 2</li>
          </ul>
        </div>
      </header>
      <section className="container" ref={containerRef}>
        <div className="slides" ref={slidesWrapperRef}>
          {sliderArr.map((slide, index) => {
            return (
              <div
                className={`slide`}
                id={`slide-${index}`}
                aria-hidden={index === activeNavItem ? false : true}
                ref={(element) => {
                  // check if the element exists and if it's not already present
                  if (element && !slides.current.includes(element)) {
                    slides.current.push(element);
                  }
                }}
              >
                <div className="outer">
                  <div className="inner">
                    <progress
                      className="line"
                      max="100"
                      value="0"
                      ref={(element) => {
                        if (element && !lineRef.current.includes(element)) {
                          lineRef.current.push(element);
                        }
                      }}
                    ></progress>
                    <a href={slide.href}>
                      <div
                        className="bg"
                        ref={(element) => {
                          if (element && !bg.current.includes(element)) {
                            bg.current.push(element);
                          }
                        }}
                      >
                        <img src={slide.src} alt="" />
                      </div>
                    </a>
                  </div>
                </div>
              </div>
            );
          })}
        </div>
        <ul className="nav">
          {sliderArr.map(({ navTitle, id }, idx) => {
            return (
              <li
                key={id}
                ref={(element) => {
                  if (element && !navItems.current.includes(element)) {
                    navItems.current.push(element);
                  }
                }}
                className={idx === activeNavItem ? "is-active" : ""}
              >
                <button
                  onClick={() => slideToSection(idx)}
                  data-href={`#slide-${idx}`}
                  type="button"
                >
                  <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
                    <path d="M165.013 288.946h75.034c6.953 0 12.609 5.656 12.609 12.608v26.424c0 7.065 3.659 9.585 7.082 9.585 2.106 0 4.451-.936 6.78-2.702l90.964-69.014c3.416-2.589 5.297-6.087 5.297-9.844 0-3.762-1.881-7.259-5.297-9.849l-90.964-69.014c-2.329-1.766-4.674-2.702-6.78-2.702-3.424 0-7.082 2.519-7.082 9.584v26.425c0 6.952-5.656 12.608-12.609 12.608h-75.034c-8.707 0-15.79 7.085-15.79 15.788v34.313c0 8.706 7.082 15.79 15.79 15.79z" />
                    <path d="M256 0C114.842 0 .002 114.84.002 256S114.842 512 256 512s255.998-114.84 255.998-256S397.158 0 256 0zm0 66.785c104.334 0 189.216 84.879 189.216 189.215S360.334 445.215 256 445.215 66.783 360.336 66.783 256 151.667 66.785 256 66.785z" />
                  </svg>
                  <h2>{navTitle}</h2>
                </button>
              </li>
            );
          })}
        </ul>
      </section>
      <section className="container">
        <div className="inner">
          <h1>HELLO!!!</h1>
        </div>
      </section>
      <section className="container">
        <div className="inner">
          <h1>HELLO!!! AGAIN</h1>
        </div>
      </section>
    </>
  );
}

const root = ReactDOM.createRoot(document.getElementById("root"));
root.render(<App />);

// console.clear();

// gsap.registerPlugin(ScrollTrigger);

// const slides = gsap.utils.toArray(".slide");

// const slidesTl = gsap.timeline({
//   defaults: {
//     ease: "none"
//   },
//   scrollTrigger: {
//     trigger: ".container",
//     pin: true,
//     start: "top top",
//     end: "bottom top",
//     scrub: true,
//     markers: true
//   }
// });

// slides.forEach((slide, i) => {
//   console.log("fired", slide, i);

//   slidesTl.to(slide, {
//     clipPath: "polygon(0% 100%, 100% 100%, 100% 0%, 0% 0%)"
//   });
// });
!
999px

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