/* variables */
:root {
    /* main colors */
    --blue: #1e90ff;
    --blue-compliment: #1082f1;

    /* bg colors */
    --primary-bg-color: #ffffff;
    --primary-bg-color-inv: #000000;
    --secondary-bg-color: #f1f1f1;

}

/* classes | containers */

.flex-container {
    display: flex;
    background-color: var(--secondary-bg-color);
}

.title {
    color: var(--primary-bg-color-inv);

    /* text alignment */
    margin: 0px 10px;
  
}

.title a {
    text-decoration: none;
    color: var(--primary-bg-color-inv)
}

.center-figure {
    text-align: center;
}

/* general style */

html, body {
    max-width: 1500px;
    margin: auto;
}

body {
    background-color: var(--primary-bg-color);
    margin: 10px;
}

header {
    background-color: var(--blue);
    
    /* border */
    border-color: var(--blue-compliment);
    border-bottom-style: solid;
    border-bottom-width: 10px;
    
    /* alignment */
    margin-bottom: 10px;
}

/* flexbox */
nav {
    background-color: var(--secondary-bg-color);
    
    /* flex style */
    justify-content: space-around;
}

nav a {
    margin: 2px;
    text-decoration: none;
    color: var(--primary-bg-color-inv);
}

main hr {
    color: var(--secondary-bg-color);
}

main table {
    /* size and position */
    width: 100%;
}

/* pages.html | table */
#article-list {
    width: 100%;
}

#article-list tr:nth-child(even) {
    background-color: var(--primary-bg-color);
}

footer {
    /* self alignment */
    margin-top: 10px;

    /* border */
    border-color: var(--secondary-bg-color);
    border-style: solid;
    border-width: 2px 0px;
}

footer p {
    /* text alignmenet */
    justify-self: center;
    text-align: center;
    
    /* font style */
    font-size: 0.8em;
    font-style: italic;
}

/* forms */
label {
    float: left;
    display: block;
    text-align: right;
    width: 125px;
    padding-right: 2em;
}

input, textarea {
    display: block;
    margin-bottom: 20px;
}

iframe {
    width: auto;
}

#submit {
    margin-left: 135px;
}

#keyboardImage {
    width: 50%;
    height: 50%;
}

figure figcaption,
figure p {
    font-size: 0.8em;
}

/* phone */
@media only screen and (max-width: 37.5em) {

    body {
        margin: 0px;
    }

    main {
        padding: 0.1em 1em;
        font-size: 90%;
    }
    
    h1 {
        font-size: 2em;
    }

    nav a {
        margin: 5px;
    }
}