*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    font-family: Arial, sans-serif;
    min-height:100vh;
    overflow:hidden;
    background:#050816;
    color:white;
}

.background{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background:
    radial-gradient(circle at top, #1f2f5c, #050816);
    z-index:-1;
}

.container{
    min-height:100vh;
    display:flex;
    flex-direction:column;
    justify-content:center;
    align-items:center;
    text-align:center;
    padding:20px;
}

h1{
    font-size:3rem;
    margin-bottom:15px;
}

h2{
    font-size:1.8rem;
    font-weight:300;
    margin-bottom:30px;
}

.subtitle{
    font-size:1.2rem;
    margin-bottom:30px;
}

#countdown{
    display:flex;
    gap:15px;
    flex-wrap:wrap;
    justify-content:center;
}

.time-box{
    background:rgba(255,255,255,0.08);
    border:1px solid rgba(255,255,255,0.15);
    padding:20px;
    border-radius:15px;
    min-width:90px;
}

.time-box span{
    display:block;
    font-size:2rem;
    font-weight:bold;
}

.time-box small{
    font-size:0.8rem;
}

#startBtn{
    margin-top:40px;
    padding:15px 40px;
    border:none;
    border-radius:50px;
    cursor:pointer;
    font-size:1rem;
    background:white;
    color:black;
    transition:0.3s;
}

#startBtn:hover{
    transform:scale(1.05);
}

@media(max-width:768px){

    h1{
        font-size:2rem;
    }

    h2{
        font-size:1.3rem;
    }

    .time-box{
        min-width:75px;
        padding:15px;
    }

    .time-box span{
        font-size:1.5rem;
    }

}
/* Stars */

.stars{
    position:fixed;
    width:100%;
    height:100%;
    top:0;
    left:0;
    pointer-events:none;
}

.stars::before{
    content:"";
    position:absolute;
    width:2px;
    height:2px;
    background:white;

    box-shadow:
    5vw 10vh white,
    20vw 30vh white,
    35vw 15vh white,
    50vw 25vh white,
    70vw 40vh white,
    80vw 20vh white,
    90vw 60vh white,
    15vw 70vh white,
    40vw 80vh white,
    60vw 75vh white;

    animation:twinkle 4s infinite alternate;
}

@keyframes twinkle{
    from{
        opacity:.3;
    }
    to{
        opacity:1;
    }
}

/* Floating particles */

.particles{
    position:fixed;
    width:100%;
    height:100%;
    top:0;
    left:0;
    pointer-events:none;
}

.particles span{
    position:absolute;
    width:6px;
    height:6px;
    border-radius:50%;
    background:rgba(255,255,255,.6);

    animation:floatUp 15s linear infinite;
}

.particles span:nth-child(1){
    left:10%;
    animation-delay:0s;
}

.particles span:nth-child(2){
    left:20%;
    animation-delay:2s;
}

.particles span:nth-child(3){
    left:35%;
    animation-delay:4s;
}

.particles span:nth-child(4){
    left:50%;
    animation-delay:6s;
}

.particles span:nth-child(5){
    left:65%;
    animation-delay:8s;
}

.particles span:nth-child(6){
    left:75%;
    animation-delay:10s;
}

.particles span:nth-child(7){
    left:85%;
    animation-delay:12s;
}

.particles span:nth-child(8){
    left:95%;
    animation-delay:14s;
}

@keyframes floatUp{

    0%{
        transform:translateY(100vh);
        opacity:0;
    }

    20%{
        opacity:1;
    }

    80%{
        opacity:1;
    }

    100%{
        transform:translateY(-100px);
        opacity:0;
    }

}