html {
  height: 100%;

  margin: 0;

  scroll-behavior: smooth;
}

section {
  padding: 80px 0;
}

nav {
  width: 100%;
  z-index: 1050;
  background-color: #212529;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

#mainNav {
  position: fixed;
}

.hero {
  background: linear-gradient(to right, #4e54c8, #8f94fb);
  color: white;
  padding: 120px 20px;
  text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.3);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: bold;
}

.hero p {
  font-size: 1.3rem;
  max-width: 700px;
  margin: auto;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 40px;
}

footer {
  background: #212529;
  color: white;
  padding: 20px 0;
  text-align: center;
}

#preloader {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  background-color: white;
  display: flex;
  justify-content: center;
  align-items: center;
}