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Gradient Text Hue Shift

Text with animated gradient background that shifts hue and saturation as you scroll. Uses CSS Custom Properties updated in real-time by GSAP ScrollTrigger.

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gsap scrolltrigger css-variables lenis

目标: JS HTML

代码

:root {
  --bg: #070a12;
  --text: #f0f4fb;
  --panel: #121a2b;
  --border: #263249;
  --accent: #86e8ff;
  --muted: #8a95a8;
  --hue-hero: 0deg;
  --hue: 0deg;
  --hue-saturation: 80%;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: linear-gradient(135deg, rgba(134, 232, 255, 0.05) 0%, rgba(174, 82, 255, 0.05) 100%);
}

.hero-content {
  max-width: 700px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero .gradient-text {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -1px;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 500px;
  margin: 0 auto;
}

/* Gradient Text Styling */
.gradient-text {
  background: linear-gradient(
    90deg,
    hsl(var(--hue-hero), var(--hue-saturation), 50%),
    hsl(calc(var(--hue-hero) + 60deg), var(--hue-saturation), 50%),
    hsl(calc(var(--hue-hero) + 120deg), var(--hue-saturation), 50%)
  );
  background-size: 300% 100%;
  background-position: 0% 50%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
  animation: gradientShift 8s ease infinite;
}

/* Fallback for browsers that don't support gradient text */
@supports not (-webkit-background-clip: text) {
  .gradient-text {
    color: var(--accent);
    background: none;
  }
}

/* Spacer Sections */
.spacer {
  padding: 6rem 2rem;
  max-width: 800px;
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
}

.spacer:nth-child(even) {
  background: rgba(18, 26, 43, 0.5);
}

.spacer h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--text);
}

.spacer p {
  font-size: 1rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.spacer ul {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.spacer li {
  color: var(--muted);
  margin-bottom: 0.8rem;
  line-height: 1.7;
}

.spacer li strong {
  color: var(--accent);
}

.spacer ol {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.spacer ol li {
  color: var(--muted);
  margin-bottom: 0.8rem;
  line-height: 1.7;
}

code {
  background: rgba(134, 232, 255, 0.1);
  color: var(--accent);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: "Monaco", "Courier New", monospace;
  font-size: 0.9rem;
}

/* Showcase Sections */
.showcase-1,
.showcase-2,
.showcase-3 {
  padding: 6rem 2rem;
  max-width: 800px;
  margin: 0 auto;
  background: linear-gradient(135deg, rgba(134, 232, 255, 0.03) 0%, rgba(174, 82, 255, 0.03) 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.showcase-1 .gradient-text {
  --hue: 0deg;
}

.showcase-2 .gradient-text {
  --hue: 60deg;
}

.showcase-3 .gradient-text {
  --hue: 120deg;
}

.showcase-1 h2,
.showcase-2 h2,
.showcase-3 h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.showcase-1 p,
.showcase-2 p,
.showcase-3 p {
  font-size: 1rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

/* Final Section */
.final-section {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 2rem;
  text-align: center;
}

.btn-back {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.8rem 1.5rem;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: 4px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-back:hover {
  background: rgba(134, 232, 255, 0.8);
  transform: translateY(-2px);
}

.content {
  max-width: 800px;
  margin: 0 auto;
}

/* Animations */
@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .hero .gradient-text {
    font-size: 2.5rem;
  }

  .spacer h2,
  .showcase-1 h2,
  .showcase-2 h2,
  .showcase-3 h2 {
    font-size: 1.5rem;
  }

  .spacer,
  .showcase-1,
  .showcase-2,
  .showcase-3 {
    padding: 3rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .hero .gradient-text {
    font-size: 1.8rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .spacer,
  .showcase-1,
  .showcase-2,
  .showcase-3 {
    padding: 2rem 1rem;
  }
}

html.reduced-motion .gradient-text {
  animation: none !important;
  background-position: 0% 50% !important;
}

html.reduced-motion * {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
}

if (!window.MotionPreference) {
  const __mql = window.matchMedia("(prefers-reduced-motion: reduce)");
  const __listeners = new Set();

  const MotionPreference = {
    prefersReducedMotion() {
      return __mql.matches;
    },
    setOverride(value) {
      const reduced = Boolean(value);
      document.documentElement.classList.toggle("reduced-motion", reduced);
      window.dispatchEvent(new CustomEvent("motion-preference", { detail: { reduced } }));
      for (const listener of __listeners) {
        try {
          listener({ reduced, override: reduced, systemReduced: __mql.matches });
        } catch {}
      }
    },
    onChange(listener) {
      __listeners.add(listener);
      try {
        listener({
          reduced: __mql.matches,
          override: null,
          systemReduced: __mql.matches,
        });
      } catch {}
      return () => __listeners.delete(listener);
    },
    getState() {
      return { reduced: __mql.matches, override: null, systemReduced: __mql.matches };
    },
  };

  window.MotionPreference = MotionPreference;
}

function prefersReducedMotion() {
  return window.MotionPreference.prefersReducedMotion();
}

function initDemoShell() {
  // No-op shim in imported standalone snippets.
}

import gsap from "gsap";
import { ScrollTrigger } from "gsap/ScrollTrigger";
import Lenis from "lenis";

gsap.registerPlugin(ScrollTrigger);

initDemoShell({
  title: "Gradient Text with Scroll Hue Shift",
  category: "scroll",
  tech: ["gsap", "scrolltrigger", "css-variables"],
});

const lenis = new Lenis({ lerp: 0.1, smoothWheel: true });
lenis.on("scroll", ScrollTrigger.update);
gsap.ticker.add((time) => lenis.raf(time * 1000));
gsap.ticker.lagSmoothing(0);

const reduced = prefersReducedMotion();
if (reduced) document.documentElement.classList.add("reduced-motion");

// Intro animation
if (!reduced) {
  gsap.set(".hero .eyebrow", { opacity: 0, y: 20 });
  gsap.set(".hero .gradient-text", { opacity: 0, y: 40 });
  gsap.set(".hero .subtitle", { opacity: 0, y: 25 });

  gsap
    .timeline({ defaults: { ease: "expo.out" } })
    .to(".hero .eyebrow", { opacity: 1, y: 0, duration: 0.7, delay: 0.3 })
    .to(".hero .gradient-text", { opacity: 1, y: 0, duration: 0.9 }, "-=0.4")
    .to(".hero .subtitle", { opacity: 1, y: 0, duration: 0.7 }, "-=0.5");
}

// Hero gradient animation — synced to overall page scroll
if (!reduced) {
  gsap.to(document.documentElement, {
    "--hue-hero": 360,
    duration: 1,
    ease: "none",
    scrollTrigger: {
      trigger: document.body,
      start: "top top",
      end: "bottom bottom",
      scrub: 0.8,
      onUpdate: (self) => {
        // Optional: update opacity based on progress
        const progress = self.progress;
        document.documentElement.style.setProperty("--hue-saturation", `${80 + progress * 20}%`);
      },
    },
  });
}

// Section-specific gradient animations
const gradientTexts = document.querySelectorAll(".gradient-text");
gradientTexts.forEach((el, index) => {
  if (el.closest(".hero")) return; // Skip hero, already animated

  // Initial state
  gsap.set(el, { opacity: 0, y: 30 });

  // Entrance animation
  gsap.to(el, {
    opacity: 1,
    y: 0,
    duration: 0.8,
    ease: "expo.out",
    scrollTrigger: {
      trigger: el,
      start: "top 75%",
      toggleActions: "play none none reverse",
    },
  });

  // Section-specific hue shift
  if (!reduced) {
    const startHue = (index * 60) % 360;
    const endHue = (startHue + 120) % 360;

    gsap.to(el, {
      "--hue": endHue,
      duration: 1.2,
      ease: "sine.inOut",
      scrollTrigger: {
        trigger: el,
        start: "top 80%",
        end: "bottom 20%",
        scrub: 1,
      },
    });

    gsap.set(el, { "--hue": startHue });
  }
});

// Stagger text content reveals
document
  .querySelectorAll(
    ".spacer p, .spacer h2, .spacer ul, .showcase-1 p, .showcase-2 p, .showcase-3 p"
  )
  .forEach((el) => {
    if (!reduced) {
      gsap.set(el, { opacity: 0, y: 20 });
      gsap.to(el, {
        opacity: 1,
        y: 0,
        duration: 0.6,
        ease: "expo.out",
        scrollTrigger: {
          trigger: el,
          start: "top 75%",
          toggleActions: "play none none reverse",
        },
      });
    }
  });

// List items stagger
document.querySelectorAll(".spacer ul li").forEach((li, i) => {
  if (!reduced) {
    gsap.set(li, { opacity: 0, x: -20 });
    gsap.to(li, {
      opacity: 1,
      x: 0,
      duration: 0.6,
      ease: "expo.out",
      delay: 0.05 * i,
      scrollTrigger: {
        trigger: li,
        start: "top 75%",
        toggleActions: "play none none reverse",
      },
    });
  }
});

// Code and ol elements
document.querySelectorAll(".spacer ol, .spacer code, .showcase-1 code").forEach((el) => {
  if (!reduced) {
    gsap.set(el, { opacity: 0, y: 15 });
    gsap.to(el, {
      opacity: 1,
      y: 0,
      duration: 0.6,
      ease: "expo.out",
      scrollTrigger: {
        trigger: el,
        start: "top 75%",
        toggleActions: "play none none reverse",
      },
    });
  }
});

// Motion preference listener
window.addEventListener("motion-preference", (e) => {
  if (e.detail.reduced) {
    gsap.globalTimeline.paused(true);
  } else {
    gsap.globalTimeline.paused(false);
  }
});

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Gradient Text with Scroll Hue Shift — stealthisdesign</title>
  <link rel="stylesheet" href="style.css">
    <script type="importmap">{"imports":{"gsap":"https://esm.sh/[email protected]","gsap/ScrollTrigger":"https://esm.sh/[email protected]/ScrollTrigger","gsap/SplitText":"https://esm.sh/[email protected]/SplitText","gsap/Flip":"https://esm.sh/[email protected]/Flip","gsap/ScrambleTextPlugin":"https://esm.sh/[email protected]/ScrambleTextPlugin","gsap/TextPlugin":"https://esm.sh/[email protected]/TextPlugin","gsap/all":"https://esm.sh/[email protected]/all","gsap/":"https://esm.sh/[email protected]/","lenis":"https://esm.sh/[email protected]/dist/lenis.mjs","three":"https://esm.sh/[email protected]","three/addons/":"https://esm.sh/[email protected]/examples/jsm/"}}</script>
  <style>html.lenis,
html.lenis body {
  height: auto;
}

.lenis:not(.lenis-autoToggle).lenis-stopped {
  overflow: clip;
}

.lenis [data-lenis-prevent],
.lenis [data-lenis-prevent-wheel],
.lenis [data-lenis-prevent-touch] {
  overscroll-behavior: contain;
}

.lenis.lenis-smooth iframe {
  pointer-events: none;
}

.lenis.lenis-autoToggle {
  transition-property: overflow;
  transition-duration: 1ms;
  transition-behavior: allow-discrete;
}</style>
</head>
<body>
  <section class="hero">
    <div class="hero-content">
      <span class="eyebrow">Demo 37</span>
      <h1 class="gradient-text">Gradient Text Hue Shift</h1>
      <p class="subtitle">Text with animated gradient background that shifts hue and saturation as you scroll down the page. Pure CSS + GSAP ScrollTrigger.</p>
    </div>
  </section>

  <section class="spacer">
    <div class="content">
      <h2>How It Works</h2>
      <p>This effect uses CSS Custom Properties (CSS variables) to dynamically control the hue, saturation, and lightness of a gradient background applied to text.</p>
      <p>As the user scrolls, GSAP ScrollTrigger updates the CSS variables in real-time, creating a smooth color shift that feels organic and modern.</p>
    </div>
  </section>

  <section class="showcase-1">
    <div class="content">
      <h2 class="gradient-text">The Technique</h2>
      <p>A heading element uses <code>background: linear-gradient(...)</code> with CSS variables for hue rotation. Each section has its own hue range.</p>
      <p>The effect is simple but impactful: as you scroll past, the text color smoothly transitions through the color spectrum.</p>
    </div>
  </section>

  <section class="spacer">
    <div class="content">
      <h2>Perfect For</h2>
      <ul>
        <li><strong>Hero sections:</strong> Draw attention with color-shifting headlines</li>
        <li><strong>Section headers:</strong> Visual rhythm and engagement</li>
        <li><strong>Feature callouts:</strong> Highlight key messages</li>
        <li><strong>Portfolio pages:</strong> Modern, eye-catching typography</li>
        <li><strong>Marketing sites:</strong> Brand color integration and movement</li>
      </ul>
    </div>
  </section>

  <section class="showcase-2">
    <div class="content">
      <h2 class="gradient-text">Advanced Variations</h2>
      <p>You can layer multiple hue shifts, adjust saturation for desaturation on scroll, or synchronize the shift with other animations on the page.</p>
      <p>The gradient direction can also be linked to scroll velocity for even more dynamism.</p>
    </div>
  </section>

  <section class="spacer">
    <div class="content">
      <h2>Implementation</h2>
      <ol>
        <li>Define CSS variables for hue: <code>--hue: 0deg</code></li>
        <li>Apply gradient to text: <code>background: linear-gradient(to right, hsl(var(--hue), 100%, 50%), ...)</code></li>
        <li>Use <code>background-clip: text</code> to show only the gradient on text</li>
        <li>Update <code>--hue</code> with ScrollTrigger's <code>onUpdate</code> callback</li>
        <li>Wrap in <code>prefers-reduced-motion</code> check for accessibility</li>
      </ol>
    </div>
  </section>

  <section class="showcase-3">
    <div class="content">
      <h2 class="gradient-text">Responsive & Accessible</h2>
      <p>The effect gracefully degrades on browsers without gradient text support. When <code>prefers-reduced-motion</code> is enabled, the gradient is static or removed entirely.</p>
    </div>
  </section>

  <section class="final-section">
    <div class="content">
      <p style="text-align: center; color: var(--muted);">Scroll back to the top to see the hero gradient shift again.</p>
      <a href="/" class="btn-back">Back to Showcase</a>
    </div>
  </section>

  <script type="module" src="script.js"></script>
</body>
</html>

Gradient Text Hue Shift

Text with animated gradient background that shifts hue and saturation as you scroll. Uses CSS Custom Properties updated in real-time by GSAP ScrollTrigger.

Source

Repository: libs-genclaude
Original demo id: 37-gradient-text-scroll

Notes

Text with animated gradient background that shifts hue and saturation as you scroll. Uses CSS Custom Properties updated in real-time by GSAP ScrollTrigger.