/* general settings */

:root {
    --primary-color: darkblue;
    --answer-bkg-color: #f1f1f8;
}

body {
    font-size: 14pt;
    color: black;
}

a {
    color: black;
}

p {
    margin: .5em 0em;
}

code, pre {
    font-family: Inconsolata;
}

pre {
    margin: 0;
    padding: 0;
}

/* index page */

#index {
    max-width: 40em;
    width: 100%;
    margin: 0 auto;
    line-height: 1.8em;
}

#index ul {
    list-style-type: none;
}

/* buttons at top */

#buttons {
    text-align: left;
    max-width: 40em;
    width: 100%;
    margin: 0 auto;
}


#top-buttons {
    padding-top: .5em;
    text-align: center;
}


#button-reveal-all {
    opacity: 0.4;
}

/* row */

.row {
    border-top: .5pt solid black;
    display: flex;
    flex-wrap: wrap;
    margin: 0 auto;
    max-width: 40em;
    opacity: 0.05;
    position: relative;
}

#buttons-under {
    width: 100%;
    text-align: right;
    padding-bottom: 1em;
}

#buttons-under button {
    visibility: hidden;
    font-size: 0.9em;
    line-height: 1.8em;
    margin-right: .1em;
    margin-top: .2em;
}

#buttons-under button.learned-something {
    margin-right: 1em;
}

.star {
    display: inline-block;
    font-size: 1.2em;
}

.star.learned {
    color: yellow;
}

.row.question-revealed #buttons-under button {
    visibility: visible;
}

.row.done.question-revealed #buttons-under .next-question {
    visibility: hidden;
}

.all-revealed #buttons-under button.learned-something {
    visibility: visible;
}

.all-revealed .row.question-revealed #buttons-under button.next-question {
    visibility: hidden;
}

button {
    background-color: var(--primary-color);
    border-radius: 5px;
    padding: .3em .7em;
    color: white;
    font-size: 1em;
    border: none;
}

.row.revealed, .all-revealed .row {
    opacity: 1;
}

.chapter + .row {
    border-top: 0px;
}

/* question/answer divs */

.question, .answer {
    max-width: 18em;
    width: 100%;
    margin: .5em;
    padding: .5em;
    min-width: 10em;
    border-radius: 10px;
    background-color: white;
}

.answer {
    position: relative;
    border-radius: 10px;
    background-color: var(--answer-bkg-color);
}

.answer::before {
    text-align: center;
    width: 100%;
    position: absolute;
    top: .2em;
    left: .2em;
    bottom: .2em;
    right: .2em;
    content: '';
    background-color: var(--primary-color);
    border-radius: 10px;
    transition: all 0.5s ease-out;
}

.answer.revealed::before, .all-revealed .answer::before {
    top: 100%;
    left: .2em;
    bottom: .2em;
    right: .2em;
}

.answer::after {
    content: 'reveal';
    text-align: center;
    font-family: sans-serif;
    color: white;
    position: absolute;
    font-size: 1.5em;
    top: 40%;
    left: 0;
    right: 0;
    height: 100%;
}

.answer.revealed::after , .all-revealed .answer::after{
    display: none;
}

.question h3, .answer h3 {
    text-align: center;
    font-size: 1.2em;
    font-weight: normal;
    margin: 0em;
}

ol, ul {
    margin: 0 0 0 2em;
    padding: 0;
}

/* tables */

table.ip {
    font-family: Inconsolata;
}

td {
    border: .5pt solid black;
    padding: .2em .5em;
    margin: 0;
}



/* headers */

h1 {
    text-align: center;
}

h1,h2,h3,h4,h5 {
	font-weight: bold;
}