body, html {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: 'Segoe UI', 'Arial', sans-serif;
  background: #12131A;
  color: #D9EAFB;
  position: relative;
}

.bg-overlay {
  position: fixed;
  inset: 0;
  z-index: -2;
  background: url('tech.jpg') center/cover no-repeat;
  opacity: 0.23;
  filter: blur(1.5px) brightness(0.55);
}

.main-flex {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  background: rgba(20,36,56, 0.83);
  border-radius: 20px;
  box-shadow: 0 2px 24px #2c1141a3;
  margin: 28px auto 14px auto;
  max-width: 940px;
  gap: 32px;
  padding: 40px 18px;
}

.hero-img {
  width: 260px;
  max-width: 60vw;
  border-radius: 20px;
  box-shadow: 0 4px 48px #00fff781;
  border: 2px solid #1afeffb0;
  object-fit: contain;
}

.hero-content {
  max-width: 500px;
}
h1 {
  font-size: 2.3rem;
  color: #50F8C9;
  text-shadow: 0 0 8px #1afeff90;
  margin-bottom: 0;
}
h2 {
  font-size: 1.13rem;
  color: #fff;
  margin-top: 8px;
}
.highlight {
  color: #73afff;
  background: #203aad94;
  padding: 2px 7px;
  border-radius: 8px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(280px,1fr));
  gap: 32px;
  justify-content: center;
  max-width: 1120px;
  margin: 44px auto 25px auto;
  padding: 0 24px;
}
.hex-card {
  background: rgba(16,25,34,0.92);
  border-radius: 24px;
  border: 2.4px solid #25ffe4e0;
  box-shadow: 0 0 26px #00fff72b;
  padding: 30px 24px 18px 24px;
  transition: border-color 0.5s;
  overflow: hidden;
}
.hex-card:hover {
  border-color: #56b6ff;
  box-shadow: 0 0 36px #4ba6e6a5;
}
.hex-card h3 {
  color: #50f8c9;
  font-size: 1.13rem;
}

.card-grid ul, .card-grid p {
  font-size: 1rem;
  margin-top: 8px;
  margin-bottom: 8px;
}

.diagram-flex {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin: 18px 0 8px 0;
}
.diagram-step {
  background: linear-gradient(96deg,#1afeff 60%,#83ffcf 100%);
  color: #160e38;
  font-weight: bold;
  padding: 5px 18px;
  border-radius: 16px;
  font-size: 1rem;
  box-shadow: 0 0 6px #1afeff41;
}
.arrow {
  color: #85ffe2;
  font-size: 1.15rem;
  font-weight: bold;
  text-shadow: 0 0 4px #00fff75a;
}

.fade {
  opacity: 0;
  transform: translateY(54px);
  transition: opacity 1.1s cubic-bezier(.51,.19,.35,1), transform 1.2s cubic-bezier(.41,.68,.57,1);
  will-change: opacity, transform;
}
.fade.visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 750px) {
  .main-flex {
    flex-direction: column;
    gap: 18px;
    padding: 18px;
  }
  .hero-img {
    margin: 0 auto 10px auto;
    max-width: 90vw;
  }
  .card-grid {
    grid-template-columns: 1fr;
    padding: 0 6px;
  }
  .hex-card {
    padding: 18px 10px;
  }
}