@media (max-width: 768px) {
  header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 66px;
  padding: 0 28px;

  width: 100%;
  max-width: 100vw;
  overflow: visible;

  display: flex;
  align-items: center;
  justify-content: space-between;

  background: rgba(3, 8, 16, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0, 150, 255, 0.18);
}

  header::after {
  display: block;
  left: 0;
  width: 36vw;
}

  @keyframes sweep {
    0% {
      transform: translateX(-120%);
      opacity: 0;
    }

    15% {
      opacity: 1;
    }

    85% {
      opacity: 1;
    }

    100% {
      transform: translateX(285%);
      opacity: 0;
    }
  }

  .brand img {
    height: 36px;
  }

  .brand span {
    font-size: 0.82rem;
  }

  .burger {
  display: block;
  position: relative;
  z-index: 10000;
  }

  nav {
  display: none;
  position: fixed;
  top: 66px;
  right: 14px;
  z-index: 9999;

  width: min(220px, calc(100vw - 28px));
  flex-direction: column;
  gap: 0;

  background: rgba(7, 13, 26, 0.98);
  border: 1px solid rgba(0, 166, 255, 0.22);
  border-radius: 12px;
  overflow: hidden;

  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.45);
}

  nav.active {
    display: flex;
  }

  nav a {
    padding: 14px 16px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }

  .hero-banner {
  height: 230px;

  background-image:
    linear-gradient(
      rgba(0, 0, 0, 0.25),
      rgba(0, 0, 0, 0.5)
    ),
    url("../images/hero-mobile.png");

  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero-content-section {
  padding: 34px 18px 28px;
}

.hero-content {
  transform: none;
  padding: 0;
}

.material-section {
  padding: 24px 18px 34px;
}

.material-slider-card {
  max-width: 100%;
  min-height: 420px;
  height: auto;

  padding: 16px;
}

  .subline {
    font-size: 0.95rem;
    line-height: 1.45;
  }

  .cta {
    margin-top: 10px;
  }
}