h1{
    width: auto;
    margin: 0 auto;
    padding: 20px;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: white;
    font-size: 60px;
    text-shadow: 4px 10px 4px rgba(0, 0, 0, 0.5);
    
}
body{
     background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

 html, body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    }

.start-button{
    position: fixed;
    top: 50%;
    left: 46%;
    color: white;
    background: linear-gradient(135deg, #667eea, #764ba2);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    border-radius: 10px;
    cursor: pointer;
    display: block;
    padding: 15px 30px;
    }
    .start-button:hover {
  background: linear-gradient(135deg, #764ba2, #667eea);
  box-shadow: 0 6px 20px rgba(118, 75, 162, 0.9);
  z-index: 10;
}

.container{
    display: flex;
    flex-direction: column;
    padding: 20px;
    background-color: rgba(82, 56, 131, 0.8);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.3);
    height: 10vh;
    justify-content: center;
    align-items: center;
    z-index: 10;
}


.slide-in{
    animation: slideDown 1.5s cubic-bezier(0.4, 0, 0.2, 1) forwards, bob 2s ease-in-out infinite;
    opacity: 0;
}

.particles-container {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.particle {
    position: absolute;
    background: blue;
    border-radius: 50%;
    animation-name: floatUp;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    animation-direction: normal;
    z-index: 1;
}

@keyframes floatUp{
0% {
    transform: translateY(100vh) translateX(0);
    opacity: 0;
}
10% {
    opacity: 1;
}
100% {
    transform: translateY(-10vh) translateX(20px);
    opacity: 0;
}
}

@keyframes slideDown{
    0% {
        transform: translateY(0);
        opacity: 0;
    }
    100%{
        transform: translateY(-100px);
        opacity: 1;
    }
}

@keyframes bob{
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
    100% {
        transform: translateY(0);
    }
}

.hidden {
    opacity: 0;
    transition: opacity 0.5s ease;
}