.top-box{
    display: flex;
    justify-content: center;
    align-items: center;
}
.top-heading{
       font-family: 'Poppins', sans-serif;
    font-size: 80px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 5px;

    background: linear-gradient(
        90deg,
        #ffffff,
        #00ffff,
        #ffffff,
        #00ff99,
        #ffffff
    );

    background-size: 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;

    position: relative;

    animation:
        shine 5s linear infinite,
        float 3s ease-in-out infinite;

    text-shadow:
        0 0 10px rgba(255,255,255,0.8),
        0 0 20px rgba(0,255,255,0.8),
        0 0 40px rgba(0,255,255,0.7),
        0 0 80px rgba(0,255,255,0.6);

    transform-style: preserve-3d;
    perspective: 1000px;
}

/* Sliding Light Effect */
.heading::before{
    content: attr(data-text);
    position: absolute;
    left: 0;
    top: 0;

    width: 100%;
    height: 100%;

    color: rgba(69, 47, 47, 0.2);

    filter: blur(8px);

    z-index: -1;

    animation: glow 2s ease-in-out infinite alternate;
}

/* Gradient Animation */
@keyframes shine{
    0%{
        background-position: 0%;
    }
    100%{
        background-position: 300%;
    }
}

/* Floating 3D Motion */
@keyframes float{
    0%{
        transform: translateY(0px) rotateX(0deg);
    }
    50%{
        transform: translateY(-15px) rotateX(12deg);
    }
    100%{
        transform: translateY(0px) rotateX(0deg);
    }
}

/* Extra Glow */
@keyframes glow{
    from{
        opacity: 0.5;
    }
    to{
        opacity: 1;
    }
}
body{
    background-color: black;
}
.input-box-container{
    display: flex;
    height:20rem;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    
}
.rr{
    text-decoration: solid;
    font-size: larger;
    font-display: fallback;
    letter-spacing:2px;
}
.gg{
    margin-left:40px;
}
 .msg-container{
       display: flex;
    justify-content: center;
    align-items: center;
    height:200px;
    color:white;
  
 }
 .msg-screen{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color:antiquewhite
 }
 .top-heading-msg-screen{
   font-size: xx-large;
   text-decoration: underline;
 }
 #btn{
    padding: 18px 45px;
    font-size: 24px;
    font-weight: bold;
    font-family: Arial, sans-serif;

    color: white;
    background: linear-gradient(135deg, #00c6ff, #0072ff);

    border: none;
    border-radius: 50px;

    cursor: pointer;

    box-shadow:
        0 0 10px rgba(0,198,255,0.6),
        0 0 25px rgba(0,114,255,0.5),
        0 0 50px rgba(0,114,255,0.4);

    transition: all 0.4s ease;

    position: relative;
    overflow: hidden;

    letter-spacing: 2px;
    text-transform: uppercase;
}

/* Hover Effect */
#btn:hover{
    transform: scale(1.08) translateY(-5px);

    box-shadow:
        0 0 20px rgba(0,198,255,0.9),
        0 0 40px rgba(0,114,255,0.8),
        0 0 80px rgba(0,114,255,0.7);
}

/* Click Effect */
#btn:active{
    transform: scale(0.96);
}

/* Shine Animation */
.calculate-btn::before{
    content: "";

    position: absolute;
    top: 0;
    left: -100%;

    width: 100%;
    height: 100%;

    background: rgba(255,255,255,0.3);

    transform: skewX(-25deg);

    transition: 0.7s;
}

#btn:hover::before{
    left: 120%;
    background-color: #00ff99;
}