* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    color: var(--font);
    font-family: var(--bodyFont);
    background-color: var(--background);
    border-radius: var(--borderRadius);
    }

:root {
    --primary: #642280;
    --accent: #FFCCE8;
    --font: #190D1B;
    --background: #f2f2e6;
    --accent2: #AB84B9;
    --input: #FCCCFF;
    --borderStyle: 5px groove #642280;
    --thinBorder: 2px solid #411B50;
    --borderRadius: 10px 0px;
    --headingFont: "Satisfy", cursive;
    --bodyFont: "Lora", serif;
    --boxShadow: 5px 5px 5px var(--primary);
    --backdrop: #190D1BDD
}
/* everything that needs a border */
h1, h2, footer,
.flip-card, fieldset {
   border: var(--borderStyle);
   border-radius: var(--borderRadius); 
}
/* everything that needs a thin border */
nav, .nonflip-card,
.flip-card-back button,
input[type="text"],
input[type="email"],
textarea,
.confirmation,
.other-info {
    border: var(--thinBorder);
    border-radius: var(--borderRadius);
}
/* all background colors that are the same */
nav, nav li, h3,
.author-container .flip-card,
.author-container p,
form {
    background-color: var(--accent);
}
h2, .flip-card-back button,
.confirmation, .confirmation span {
    background-color: var(--accent2);
}
/* everything that needs a box shadow */
.other-info, .flip-card-back button,
.card-img, input[type="submit"],
#close-button, #book-filter-button {
    box-shadow: var(--boxShadow);
}

.hdr-top {
    display: grid;
    grid-template-columns: 6rem auto 2.75rem;
    background-color: var(--primary);
    color: var(--background);
}

.hdr-top img {
    width: 6rem;
    height: auto;
}

.hdr-top span {
    display: inline-block;
    width: 75%;
    text-align: left;
    align-self: center;
    font-family: var(--headingFont);
    font-size: 2rem;
    padding-left: .6rem;
    background-color: var(--primary);
    color: var(--background);
}

#nav-button {
    font-weight: 700;
    background-color: var(--primary);
    font-size: 1.75rem;
    color: var(--background);
    position: absolute;
    top: 0.75em;
    right: 0.75em;
    border: var(--thinBorder);
}

.hamburger::before {
    content: "\2630";
}

.hamburger.show::before {
    content: "\00D7";
    font-size: 2rem;
}

.navigation {
    display: none;
    margin-top: .6rem;
}

.navigation.show {
    display: block;
}

nav ul li {
    text-decoration: none;
    min-width: 17.5rem;
}

nav ul {
    list-style: none;
}

nav a {
    display: block;
    padding: .75rem 1.5rem;
    text-decoration: none;
}

.current {
    background-color: var(--background);
    font-weight: 700;
}

main {
    text-align: center;
}

#filter-modal {
    padding: .3rem;
    margin: 1.3rem;
    width: 99%;
    max-width: 18rem;
}

#modal-content .label-heading {
    text-align: center;
}

.modal-content select {
    padding: .3rem;
    margin-top: .2rem;
}

::backdrop {
    background-color: var(--backdrop);
}

#nav-button,
#social a img {
    width: 3rem;
    height: 3rem;
}

body {
    padding: 1rem;
}

h2, footer {
    text-align: center;
}

h1, #copyright, #social,
footer p, footer span, footer img,
.main-info, .main-info p {
    background-color: var(--primary);
    color: var(--background);
}

h1, h2 {
    font-family: var(--headingFont);
    padding: .5rem;
}

h1 {
    font-size: 2.5rem;
    margin: .5rem 0;
    text-align: left;
}

h2 {
    margin: .5rem 0;
    font-size: 1.75rem;
}

h3 {
    text-align: center;
    padding: .5rem;
    border-bottom: var(--thinBorder);
    width: 100%;
}

main p {
    padding: .3rem;
    text-align: center;
}

summary {
    list-style: none;
}

.form-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.card-container {
    display: flex;
    flex-direction: column;
    gap: 5px;
    align-items: center;
    overflow: hidden;
}
.author-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 99%;
}

.nonflip-card {
    width: 99%;
    max-width: 19.4rem;
}

.flip-card {
    max-width: 19.4rem;
    background-color: transparent;
    perspective: 1000px;
    box-shadow: 0 4px 8px 0 #74226C33, 0 6px 20px 0 #74226C30;
}

.flip-card-inner {
    text-align: center;
    transition: transform 0.8s, height 0.8s;
    transform-style: preserve-3d;
}

.flip-card.is-flipped .flip-card-inner{
    transform: rotateY(180deg);
}

.flip-card.is-flipped .flip-card-back {
    position: relative;
}

.flip-card.is-flipped .flip-card-front {
    position: absolute;
}

.flip-card-front,
.flip-card-back {
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotateX(0deg);
}

.flip-card-front {
    position: relative;
}

.flip-card-back {
    position: absolute;
    transform: rotateY(180deg);
    flex-direction: column;
}

.flip-card-back p {
    padding: .6rem;
}

.flip-card-back button {
    padding: .5rem;
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: .3rem;
}

.card-img {
    width: 99%;
    height: auto;
}

.main-info, .other-info {
    padding: .5rem;
}

.other-info {
    margin: .5rem;
}

form {
    width: 100%;
    max-width: 750px;
}

fieldset {
    margin: 1rem auto;
    padding: .75rem;
    width: 100%;
    min-width: 0;
    max-width: 31.25rem;
}

legend {
    padding: .3rem .6rem;
    font-size: 1.25rem;
    font-weight: 600;
    text-align: left;
    margin-left: 0;
    border-bottom: var(--thinBorder);
}

label, .label-heading {
    display: block;
    text-align: left;
}

.input {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 20px;
    align-items: center;
}

.label-heading {
    padding-top: 1.25rem;
    font-size: 1.1rem;
    font-weight: 500;
}

input[type="radio"] {
    margin-right: .125rem;
}

input[type="text"],
input[type="email"],
textarea {
    display: block;
    background-color: var(--input);
    padding: .75rem;
    width: 100%;
    min-width: 15.6rem;
    max-width: 28.125rem;
    margin-top: .2rem;
}

input[type="submit"],
#close-button, #book-filter-button {
    border: none;
    background-image: linear-gradient(var(--input), var(--accent2));
    padding: .8rem;
    width: 99%;
    max-width: 25rem;
    font-size: 1.1rem;
    font-weight: 500;
}

input[type="submit"], #close-button {
    margin: .75rem 0;
}

#book-filter-button {
    margin: .2rem 0 .8rem;
}

input:required,
textarea:required {
    border-left: 8px solid var(--accent2);
}

input:required:valid,
textarea:required:valid {
    border-left: 8px solid var(--primary);
}

.confirmation {
    margin-top: .5rem;
    width: 90%;
}

#social, #copyright {
    border-radius: 0;
    padding-top: .6rem;
}

#copyright {
    padding-bottom: .6rem;
}

/* #subscribe {
    border-radius: 0;
    background-color: var(--primary);
    color: var(--background);
} */
/* iframe {
    border: 0;
    overflow: hidden;
} */

footer {
    margin-top: .6rem;
    font-size: .9rem;
    background-color: var(--primary);
}