/* ---- reset ---- */

body {
  margin: 0;
  font: normal 75% Arial, Helvetica, sans-serif;
}

canvas {
  display: block;
  vertical-align: bottom;
}
/* ---- particles.js container ---- */

#particles-js {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: #000000;
}

/* particles background */
#particles-js{
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  background: #000;
  z-index: 0;
}

/* overlay above particles, but doesn't block interaction except the button */
.ui-overlay{
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.center-content{
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  pointer-events: none;
}

.intro-text{
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  color: #fff;
  text-align: center;
  text-shadow: 0 4px 18px rgba(0,0,0,0.45);
}

.center-button{
  pointer-events: auto; /* only this is clickable */
  display: inline-block;
  padding: 14px 22px;
  border-radius: 12px;
  text-decoration: none;
  font: 600 16px/1.1 system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: rgba(0,0,0,0.55);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.35);
  backdrop-filter: blur(6px);
}

.center-button:hover{ background: rgba(0,0,0,0.7); }
.center-button:focus{
  outline: 2px solid rgba(255,255,255,0.8);
  outline-offset: 4px;
}