.section-img {
  width: 160px;
  height: 160px;
  border-radius: 8px; /* bordas suavemente arredondadas */
  object-fit: cover;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  margin: 40px 0 30px 0;
  display: block;
  background: #b2d8c9;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 4px solid rgba(46, 204, 113, 0.6);
}
.section-img:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 40px rgba(46, 204, 113, 0.7);
  border-color: rgba(46, 204, 113, 0.9);
}
@media (max-width: 900px) {
  .section-img {
    width: 120px;
    height: 120px;
    border-radius: 6px;
    margin: 30px 0 25px 0;
  }
}
@media (max-width: 600px) {
  .section-img {
    width: 100px;
    height: 100px;
    border-radius: 4px;
    margin: 24px 0 20px 0;
  }
}
#btn-topo {
  position: fixed;
  bottom: 90px;
  right: 30px;
  background: #27ae60;
  color: white;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 28px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: background 0.3s;
}
#btn-topo:hover {
  background: #16a085;
}

#btn-whatsapp {
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 10000;
  width: 60px;
  height: 60px;
  background: none;
  cursor: pointer;
  transition: opacity 0.3s;
}
#btn-whatsapp img {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 2px 6px rgba(0,128,0,0.8));
}
#btn-whatsapp:hover {
  opacity: 0.8;
}
#btn-topo {
  position: fixed;
  bottom: 90px;
  right: 30px;
  background: #27ae60;
  color: white;
  border: none;
  border-radius: 50%;
  width: 60px;
  height: 60px;
  font-size: 40px;
  line-height: 60px;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 6px 15px rgba(0,0,0,0.35);
  display: none;
  z-index: 10000;
  transition: background 0.3s;
  user-select: none;
}
#btn-topo:hover {
  background: #16a085;
}

#btn-topo {
  position: fixed;
  bottom: 90px;
  right: 30px;
  background: #27ae60;
  color: white;
  border: none;
  border-radius: 50%;
  width: 60px;
  height: 60px;
  font-size: 40px;
  line-height: 60px;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 6px 15px rgba(0,0,0,0.35);
  display: none;
  z-index: 10000;
  transition: background 0.3s;
  user-select: none;
}
#btn-topo:hover {
  background: #16a085;
}

#btn-whatsapp {
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 10000;
  width: 50px;
  height: 50px;
  cursor: pointer;
  transition: opacity 0.3s;
}
#btn-whatsapp img {
  width: 48px;
  height: 48px;
  filter: drop-shadow(0 2px 6px rgba(0,128,0,0.8));
  border-radius: 12px;
}
#btn-whatsapp:hover {
  opacity: 0.8;
}
#particles-js {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: 0;
  background: #232526; /* fallback, base escura */
}
#particles-js {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  background-color: #1c1e22; /* tom de fundo escuro base cyber segurança */
}
nav, #top-slider, section, footer, #btn-topo, #btn-whatsapp {
  position: relative;
  z-index: 1;
}