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

}
body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: black;
    color: #e7e7e7;
    min-height: 100vh;
    line-height: 1.5;   
}

.image-gradient {
    position: absolute;
    top:0;
    right: 0;
    opacity: 0.5;
    z-index: -1;
}

.layer-blur {
    height: 0;
    width : 30rem;
    position: absolute;
    top: 20%;
    right: 0;
    box-shadow:  0 0 700px 15px white;
    rotate: -30deg;
    z-index: -1;   
}

.container {
    width: 100%;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    overflow: hidden;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5rem;


}

header h1 {
    margin: 0;
    font-size: 3rem;
    font-weight : 300   
}

nav {
    display: flex;
    align-items: center;
    gap : 3rem;
    margin-left: -5%;
}
nav a {
    font-size : 1rem;
    letter-spacing: .1rem;
    transition: color .2s ease;
    text-decoration: none;
    color: inherit;
    z-index: 999;
}

nav a:hover {
    color: #a7a7a7;
}

.btn-singing{
    background-color: #a7a7a7a7;
    color: black;
    padding: .8rem 2rem;
    border-radius : 50px;
    border: none;
    font-size: 1rem;
    font-weight:500;
    transition: background-color .2s ease;
    cursor: pointer;
    z-index: 999;
}
.btn-singing:hover {
    background-color: white ;   
}
main {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height : calc(90vh - 6rem)
}

.content {
    max-width : 40rem;
    margin-left : 10%;
    z-index: 999;
    margin-bottom: 4%;
}

.tag-box {
    position: relative;
    width: 18rem;
    height : 2.5rem;
    border-radius : 50px;
    background: linear-gradient(to right, #656565, #7f42a7, #6600c5, #5300a0, #757575, #656565);
    background-size:200%;
    animation : animationGradient 2.5s linear infinite;
    box-shadow:  0 0 15px rgba(255, 255, 255, .3);
} 

@keyframes animationGradient {
    to{
        background-position: 200%;
    }
}

.tag-box .tag {
    position: absolute;
    inset: 3px 3px 3px 3px;
    background-color: black;
    border-radius: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: .5s ease;
    cursor: pointer;
}

.tag-box .tag:hover {
    color: #5300a0;
}

.content h1 {
    font-size : 4rem;
    font-weight: 600;
    letter-spacing: .1em;
    margin: 2rem 0;
    line-height: 1.2;
    text-shadow : 0 0 10px rgba(128, 128, 128, .418);
}

.description {
    font-size : 1.2rem;
    letter-spacing: .05em;   
    max-width: 35rem;
    color:gray
}

.buttons {
    display: flex;
    gap : 1rem;
    margin-top: 3rem;
}

.btn-get-started {
    text-decoration : none;
    border: 1px solid #2a2a2a;
    padding: .7rem 1.2rem;
    border-radius: 50px;
    font-size:1.2rem;
    font-weight : 600;
    letter-spacing: .1em;
    transition : background-color .2s ease;
}

.btn-get-started:hover {
    background-color: #1a1a1a;
}

.btn-siging-main{
    text-decoration: none;
    background-color: lightgray;
    color: black;
    padding: .6rem 2.5rem;
    border-radius: 50px;
    font-weight : 600;
    font-size : 1.2rem;
    letter-spacing: .1em;
    transition : background-color .2s ease;
}
.btn-siging-main:hover {
    background-color: gray;
}

.robot-3d{
    position: absolute;
    top : 0;
    right: -25%;
    scale : .7
}

@media (max-width:1300px) {
    header {

        padding: 1rem .5rem ;
    }
    .content{
        margin-top : 85%
    }
    .robot-3d {
        scale: .6;
        top : -20%;
        right: 2%;
    }
}

@media (max-width : 768px) {
    header {
        padding: 1rem .1rem;
    }
    nav {
        display: none;
    }

    header h1 {
        font-size: 2rem;
    }

    .btn-singing {
        padding: .6rem 1.5rem;
    }
    .content {
        margin-top: 25rem;
        max-width :30rem;
        margin-left: 10%;
    }
    .robot-3d{
        scale: .5;
        top:-25%;
        right: 0;
    }
    .tag-box{
        width: 12rem;
    }

    .content h1 {
        font-size: 2.5rem;
    }
    .description{
        font-size: 1rem;
    }

    .btn-get-started{
        font-size: .8rem;
        padding: .8rem 1.2rem;
    }

    .btn-siging-main{
        font-size: .8rem;
        padding: .5rem 2rem;
    }
}