:root{
    --clr1: white;
    --clr2: grey;
    --gold: #ffcc00;
    --yellow: #ffeb3b;
    --card1: #1b1401;
    --card2: #251d00;
    --card3: #2b2201;
    --card4: #312600;
}
#main_heading{
    margin-left: 7%;
    font-size: 7.4rem;
    font-weight: 500;
}
#main_heading img{
    width:6rem;
}

.project-container{
    margin-top:1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap:20vh;
}

#arrow{
    margin-top: 5rem;
    padding-left: 15vw;
}

.card{
    width:80vw;
    height:90vh;
    color: var(--clr1);
    display: flex;
    align-items: center;
    justify-content: center;
    position: sticky;
    top:5rem;
    border-radius: 2rem;
    box-shadow: 0 0 10px var(--yellow);
}
.card:hover{
    box-shadow: 0 0 20px var(--yellow);
}
.card h2{
    margin-bottom: 2rem;
    color: var(--gold);
    border-bottom:1px solid var(--gold)
}
.card h3{
    margin-top:1.2rem;
}
.card ul{
    margin-top:0.5rem;
    padding-left:5rem;
    color: var(--clr2); 
}
.card p{
    margin-top:1rem;
    color: var(--clr2);
}

#c1{
    z-index:1;
    background: transparent;
    border-color: transparent;
    box-shadow: none;
    align-items: flex-start;
    font-size: 2rem;
    padding-top:15rem;
}
#c2{
    align-items: flex-start;
    flex-direction: column;
    padding: 2rem;
    z-index:2;
    background: var(--card2);
    font-size:2rem;
}
#c3{
    align-items: flex-start;
    flex-direction: column;
    padding: 2rem;
    font-size:2rem;
    z-index:3;
    background: var(--card3);
}
#c4{
    align-items: flex-start;
    flex-direction: column;
    padding: 2rem;
    font-size:2rem;
    Z-index:4;
    background: var(--card4);
}

.card a.button{
    margin-top: 2rem;
    padding: 1rem 3rem;
    color: var(--gold);
    border: 1px solid var(--gold);
    border-radius: 4rem;
    border-color: var(--gold);
    background-color: black;
    letter-spacing: 0.7rem;
    font-size:1.5rem;
    font-weight: 500;
}
.card a.button:hover{
    box-shadow: 0 0 10px var(--yellow);
}

.footer{
    height: 15vh; 
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--grad100);
    color: var(--clr1);
    font-size: 1.2rem;
    font-weight: 500;
    z-index: 5;
}
.footer a{
    color: var(--gold);
    border-bottom: 2px dashed var(--gold);
}


@media (max-width: 900px) {
    #main_heading {
        font-size: 3.5rem;
        margin-left: 0;
        margin-top: 2rem;
        text-align: center;
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 1rem;
    }

    #main_heading img {
        width: 3.5rem;
    }

    .project-container {
        gap: 10vh;
    }

    .card {
        width: 90vw;
        height: auto;
        min-height: 75vh;
        top: 6rem;
        padding: 2rem 1.5rem; 
    }

    .card h2 {
        font-size: 1.8rem;
        margin-bottom: 1rem;
    }

    .card h3 {
        font-size: 1.4rem;
        margin-top: 0.8rem;
    }

    .card p, .card ul {
        font-size: 1.2rem;
        line-height: 1.4;
    }

    .card ul {
        padding-left: 2.5rem;
    }

    #c1 {
        padding-top: 5rem;
        align-items: center;
        text-align: center;
    }

    #c1 h1 {
        font-size: 2rem;
    }

    #arrow {
        margin-top: 3rem;
        padding-left: 0;
        width: 50px;
    }

    .card a.button {
        font-size: 1.1rem;
        padding: 0.8rem 2rem;
        margin-top: 1.5rem;
        align-self: flex-start;
    }

    .footer {
        height: auto;
        padding: 2rem 5%;
        text-align: center;
        line-height: 1.5;
    }
}