h2 { text-align: center; font-size: 24px }

h3 { font-size: 20px }

.intro-box {
    padding: 30px; 
}

.intro-box, .card, #start-div {
    background-color: rgb(248, 249, 250); 
    border-radius: 10px;    
}

.intro-box {
    margin-left: auto; 
    margin-right: auto;    
}

.hero-box {
    margin-top: 60px;
    margin-left: auto;
    margin-right: 100px;
    border-radius: 10px;
    max-width: 700px;   
    padding: 50px; 
    opacity: 0.8;
    color: white;
    background-color: black;
}

.hero {
    width: 100%;
    min-height: 500px;
    background: url("images/shooting_range.jpg") center / cover no-repeat;
    padding-top: 1px;
    padding-bottom: 1px;
}

#intro-div .fa-solid {
    font-size: 36px;
    margin-bottom: 10px;
    margin-top: 20px;
}

.card {
    padding: 20px;
    border: none;
}

#instructions-div {
    padding-top: 30px;
    padding-bottom: 30px;
}

#intro-div section .row {
    margin-top: 20px;
}

#reg-form, #pin-form, #demo-form
{
    display: flex; 
    flex-direction: column; 
    padding: 20px; 
    gap: 20px;
}

#start-div {
    margin: 30px;
}

#start-div input {
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

#home-div {
    min-height: 100%;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
}
footer {
    flex-shrink: 0;
}

#spinner {
    display: none;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    z-index: 10;
    position: absolute;
    top: 50%;
    left: 50%;
}

#image {
    transform-origin: 0 0; 
    transition: transform 0.3s ease; 
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media only screen and (max-width: 1024px) {
    .hero-box {
        margin: 40px;
    }

    .card {

        padding: 10px;
    }
}

@media only screen and (max-width: 768px) {
    .hero {
        min-height: 0;
    }

    .hero-box {
        padding: 30px;
        text-align: center;
    }

    .intro-box {
        margin-left: 12px;
        margin-right: 12px;
    }

    #intro-div section {
        margin-top: 0;
    }    

    #intro-div section .row {
        margin-top: 0;
    }
}