SmartStruct/design-system.css at main · RAMZISAIDI/SmartStruct · GitHub

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/* SmartStruct atmosphere — drop-in CSS for the signature backdrop.
 *
 * Use:
 *   <div class="ss-atmosphere"></div>
 *   <div class="ss-particles" id="particles"></div>
 *
 * + this small JS to spawn particles:
 *   const p = document.getElementById('particles');
 *   for (let i = 0; i < 20; i++) {
 *     const el = document.createElement('div');
 *     el.className = 'ss-particle';
 *     const size = 2 + Math.random() * 3;
 *     Object.assign(el.style, {
 *       left: Math.random() * 100 + '%',
 *       bottom: '0',
 *       width: size + 'px',
 *       height: size + 'px',
 *       animationDuration: 8 + Math.random() * 12 + 's',
 *       animationDelay: Math.random() * 8 + 's'
 *     });
 *     p.appendChild(el);
 *   }
 */

.ss-atmosphere {
  position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 50%  0%, rgba(232,184,75,0.10), transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 50%, rgba(155,109,255,0.06), transparent 60%),
    radial-gradient(ellipse 70% 60% at 20% 80%, rgba( 74,144,226,0.05), transparent 60%);
}
.ss-atmosphere::before {
  content: '';
  position: absolute; left: 50%; bottom: 0;
  width: 200%; height: 60vh;
  transform: translateX(-50%) perspective(900px) rotateX(60deg);
  transform-origin: bottom center;
  background-image:
    linear-gradient(rgba(232,184,75,0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232,184,75,0.18) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 100%, #000 30%, transparent 75%);
          mask-image: radial-gradient(ellipse 60% 60% at 50% 100%, #000 30%, transparent 75%);
  opacity: 0.35;
  animation: ss-grid-scroll 20s linear infinite;
}
@keyframes ss-grid-scroll {
  from { background-position: 0 0, 0 0; }
  to   { background-position: 0 60px, 60px 0; }
}

.ss-particles { position: fixed; inset: 0; z-index: 1; pointer-events: none; overflow: hidden; }

/* Scoped stage variant — for hero sections that should NOT take over the whole viewport.
 * Apply .ss-stage to a positioned container; it provides the same grid + glow but
 * scoped to its bounds. */
.ss-stage { position: relative; isolation: isolate; }
.ss-stage > .ss-grid-overlay,
.ss-stage > .ss-radial-glow { position: absolute; inset: 0; pointer-events: none; z-index: 0; }
.ss-stage > .ss-radial-glow {
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(232,184,75,0.12), transparent 60%),
    radial-gradient(ellipse 60% 80% at 80% 50%, rgba(155,109,255,0.05), transparent 60%);
}
.ss-stage > .ss-grid-overlay { overflow: hidden; }
.ss-stage > .ss-grid-overlay::before {
  content: ''; position: absolute; left: 50%; bottom: -10%;
  width: 200%; height: 70%;
  transform: translateX(-50%) perspective(900px) rotateX(62deg);
  transform-origin: bottom center;
  background-image:
    linear-gradient(rgba(232,184,75,0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232,184,75,0.18) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 100%, #000 30%, transparent 75%);
          mask-image: radial-gradient(ellipse 60% 60% at 50% 100%, #000 30%, transparent 75%);
  opacity: 0.35;
  animation: ss-grid-scroll 20s linear infinite;
}
.ss-particle {
  position: absolute; border-radius: 50%;
  background: #E8B84B;
  box-shadow: 0 0 10px #E8B84B, 0 0 20px rgba(232,184,75,0.35);
  opacity: 0;
  animation: ss-float-up linear infinite;
}
@keyframes ss-float-up {
  0%   { transform: translateY(0)      translateX(0); opacity: 0; }
  10%  { opacity: 0.8; }
  90%  { opacity: 0.8; }
  100% { transform: translateY(-100vh) translateX(40px); opacity: 0; }
}