/* browser reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    /* colors */
    --dark-teal: #154360;
    --light-cream: #fef9e7;
    /* font */
    --body-font: 'Courier New', Courier, monospace;
}
body {    
    /* Photo by Black  ice: https://www.pexels.com/photo/lots-of-numbers-1314543/ */
    background-image: url('/projects//websites/calculator/images/numbers.jpg');
    background-size: cover;
    font-family: var(--body-font);
    font-size: 1.15em;
    line-height: 1.5;
}
footer {
    margin: 0 auto;
    padding: .5em;
    text-align: center;
    border-top: solid 2px var(--dark-teal);
    background-color: var(--light-cream);
    font-size: .9em;
    font-style: italic;
}
footer p {
    color: var(--dark-teal);
    font-size: .85rem;
    font-style: italic;
    text-align: center;
}
footer ul {
    list-style-type: none;
    display: flex;
    flex-flow: row wrap;
    justify-content: center;
    padding-bottom: .5rem;
}
footer a {    
    text-decoration: none;
    color: var(--dark-teal);
    font-size: .85rem;
    font-style: italic;
    text-align: center;
    padding: 3px 10px;
}
.return-home {
    width: max-content;
    padding: .1em .5em;
    background-color: var(--light-cream);
    box-shadow: 5px 5px 5px var(--dark-teal);  
}
.return-home a {
    text-decoration: none;
    color: var(--dark-teal);
    font-style: italic;
}
footer a:focus, footer a:hover, .return-home a:focus, .return-home a:hover {
    text-decoration: underline;
}
#wrapper {
    width: 45ch;
    border: solid 2px var(--dark-teal);
    margin-left: auto;
    margin-right: auto;
}
#calculator {
    padding: .5rem;
    background-color: var(--light-cream);
}
#calc-function {
    text-align: center;
}
#error {
    color: red;
    padding: 0 5rem;
}
.bold-text {
    font-weight: 700;    
}
h1 {
    padding: .5rem 0;
    text-align: center;
    background-color: var(--dark-teal);
    color: var(--light-cream);
}
h2 {
    color: var(--dark-teal);
    letter-spacing: 2.25px;
}
label, p, li {
    color: var(--dark-teal);
}
input, .buttons {
    margin: .5rem 0;
}
input {
    width: 3rem;
    margin-right: .5rem;
    padding: .2rem;
}
label {
    margin-left: .5rem;
    font-weight: 600;
}
div.result p {
    max-width: 45ch;
    font-weight: 700;
    font-size: 1.3rem;
    margin: 1rem 0;
    padding: 0 .5rem;
    word-wrap: break-word;
}
.button-grp {
    margin-top: .5rem;
}
button {
    background-color: var(--dark-teal);
    color: var(--light-cream);
    padding: .2rem .5rem;
    font-family: 'Courier New', Courier, monospace;
    font-weight: 700;
    letter-spacing: 1px;
    cursor: pointer;
}
button:focus, button:hover {
    background-color: orangered;
}
.button-grp button {
    font-size: 1em;
    margin-top: .5rem;
}
#instructions-btn {
    margin-bottom: 1rem;
    font-size: 1rem;
}
#instructions-div {
    display: none;
    margin: 0 .5rem 1rem 2.5rem;
}
li>p {
    margin-top: .5rem;
}
.note-list {
    margin-left: 2.5rem;
    margin-right: 1rem;
}
#calc-hr {
    display: none;
    border-color: var(--dark-teal);
    margin-bottom: 1rem;
}
/* color adjustment for dark color scheme */
@media (prefers-color-scheme: dark) { 
    body {
        /* Photo by Photo By: Kaboompics.com: https://www.pexels.com/photo/blackboard-with-handwritten-calculations-6256066/ */
        background-image: url('/projects/websites/calculator/images/chalkboard.jpg');
    }
    footer {
        border-color: var(--light-cream);    
        background-color: var(--dark-teal);
    }
    footer p, footer a {        
        color: var(--light-cream);
    }
    .return-home {
        background-color: var(--dark-teal);
        box-shadow: 5px 5px 5px var(--light-cream);  
    }
    .return-home a {
        text-decoration: none;
        color: var(--light-cream);
        font-style: italic;
    }
    #wrapper {
        border-color: var(--light-cream);
    }
    #calculator {
        background-color: var(--dark-teal);
    }
    h1 {
        background-color: var(--light-cream);
        color: var(--dark-teal);
    }
    h2 {
        color: var(--light-cream);
    }
    label, p {
        color: var(--light-cream);
    }
    button {
        background-color: var(--light-cream);
        color: var(--dark-teal);
    }
    button:hover, button:focus {
        background-color: lightsteelblue;
    }
    #instructions-div ol li {
        color: var(--light-cream);
    }
    #calc-hr {
        border-color: var(--light-cream);
    }
}