html {
  scroll-behavior: smooth;
}

header {
  text-align: center;
  position: sticky;
  top: 0;
  background-color: rgba(54, 50, 50, 0.2);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  padding: 3px;
  z-index: 100;
}

h1 {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  color: white;
  color: transparent;
  background-clip: text;
  -webkit-background-clip: text;
  background-image: linear-gradient(to bottom, #1ed92b, #2f6ccf);
  text-align: center;
}

body {
  background-color: black;
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  scroll-behavior: smooth;
   user-select: none;
  -webkit-user-select: none;
}

p {
  color: white;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-size: 40px;
}

main {
  text-align: center;
  flex: 1;
}

@keyframes bounce {
  0%, 100%{
    transform: translateY(0);

  }
  50% {
    transform: translateY(20px);
  }
}

.arrow {
  animation: bounce 1.5s infinite;
}

.os-logos {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 50px auto;
  width: 60%;
}

.os-logos img {
  transition: ease-in-out 0.2s;
}

.os-logos img:hover {
  transform: scale(1.3);
}

footer {
   text-align: center;
  position: sticky;
  top: 0;
  background-color: rgba(54, 50, 50, 0.2);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
 padding: 20px;
}

b {
  color: white;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-size: 17px; 
}

a {
  color: white;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-size: 17px; 
  margin: 20px;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  margin: 50px auto;
  width: 300px;
}

input, select {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  color: white;
  background-color: rgba(54, 50, 50, 0.2);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  border: none;
  
}

label {
  color: white;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-size: 17px; 
}

option {
  border: none;
  background-color: black;
  padding: 10px 20px;
  border-radius: 10px;
  
}

.btt1 {
  padding: 10px 20px;
  border-radius: 10px;
  border: none;
  background-image: linear-gradient(to bottom, #1ed92b, #2f6ccf);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-weight: bold;
  cursor: pointer;
  transition: transform ease-in-out 0.25s;
}

.btt1:hover {
  transform: scale(1.25);
}

select {
  outline: none;
}

.form-container {
  display: flex;
  justify-content: center;
  color: transparent;
  backdrop-filter: blur(20px);
  background-color: rgba(15, 183, 209, 0.2);
  padding: 30px;
  border-radius: 20px;
  max-width: 400px;
  margin: 100px auto;
  flex-direction: column;
  align-items: center;
}

.box-title {
  font-size: 30px;
}

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

h2 {
  color: white;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-size: 30px; 
}

.Hauptinfo {
  height: 90vh;
  font-size: clamp(40px, 4vw, 100px);
}

.btt2 {
 border-radius: 200px;
  border: none;
  background-image: linear-gradient(to bottom, #1ed92b, #2f6ccf);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  font-weight: bold;
  cursor: pointer;
  transition: transform ease-in-out 0.28s;
  padding: 20px 40px;
  animation: fadeout;
  animation-timeline: scroll();
  animation-range: 0px 1000px;
  animation-fill-mode: forwards;
}

.btt2:hover {
  transform: scale(1.25);
}

@keyframes fadeout {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
    pointer-events: none;
  }
}