*, 
*::before, 
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
  
body {
    line-height: 1.5; /* You shouldn't use this line-height on headings */
    -webkit-font-smoothing: antialiased;
}
  
img, picture, video, canvas, svg {
    display: block;
    max-width: 100%;
}
  
input, button, textarea, select, label {
    font: inherit;
    font-size: max(16px, 1rem);
    /* !Never set font-size less than 16px on these elements because of mobile zooming */
}
  
button,
input,
select,
progress,
meter {
    display: block;
    width: 100%;
    padding: 5px;
    height: 30px;
}
  
p, h1, h2, h3, h4, h5, h6 {
    overflow-wrap: break-word;
}

/* FONTS */

/*! Generated by Font Squirrel (https://www.fontsquirrel.com) on August 4, 2024 */

@font-face {
    font-family: 'ubuntu-bold';
    src: url('../assets/fonts/ubuntu-b-webfont.woff2') format('woff2'),
         url('../assets/fonts/ubuntu-b-webfont.woff') format('woff');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'ubuntu-medium';
    src: url('../assets/fonts/ubuntu-m-webfont.woff2') format('woff2'),
         url('../assets/fonts/ubuntu-m-webfont.woff') format('woff');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'ubuntu-regular';
    src: url('../assets/fonts/ubuntu-r-webfont.woff2') format('woff2'),
         url('../assets/fonts/ubuntu-r-webfont.woff') format('woff');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

/* ROOT */

:root {

    /* FONT */

    --font-regular: "ubuntu-regular", sans-serif;
    --font-medium: "ubuntu-medium", sans-serif;
    --font-bold: "ubuntu-bold", sans-serif;

    /* TYPE-SCALE */

    /* LARGE DEVICE */

    --fs-100: 0.8125rem;  /* 13px */
    --fs-200: 1rem;       /* 16px  */
    --fs-300: 1.225rem;   /* 19.6px */
    --fs-400: 1.425rem;   /* 22.8px */
    --fs-500: 2rem;       /* 32px */
    --fs-600: 2.828rem;   /* 45.25px */
    --fs-700: 4rem;       /* 64px */
    --fs-800: 5.625rem;   /* 90px */
    --fs-900: 7rem;       /* 112px */

    /* BOX SHADOW */

    --shw-dark-bottom: 0 2rem 6rem rgba(0, 0, 0, 0.3);
    --shw-medium-bottom: 0 2rem 5rem rgba(0, 0, 0, 0.08);
    --shw-light-bottom: 0 2rem 5rem rgba(0, 0, 0, 0.06);
    --shw-mini-light-bottom: 0 2rem 4rem rgba(0, 0, 0, 0.04);

    /* COLORS */

    /* PRIMARY */

    --clr-primary: rgb(249, 59, 59);
    --clr-primary--200: rgb(222, 48, 67);
    --clr-primary--300: rgb(255, 234, 236); 
    --clr-primary--400: rgb(255, 249, 249);

    /* SECONDARY */

    --clr-secondary: rgb(0, 0, 0);
    --clr-secondary--200: rgb(25, 25, 33);
    --clr-secondary--300: rgb(67, 67, 86);

    /* NEUTRAL */

    --clr-neutral: rgb(255, 255, 255);
    --clr-neutral--200: rgb(245, 245, 245);
    --clr-neutral--300: rgb(131, 131, 131);
    --clr-neutral--400:  rgb(200, 200, 200);
    --clr-neutral--500:  rgb(235, 235, 235);
}

/* GLOBAL */

body {
    font-family: var(--font-regular);
    background-color: var(--clr-neutral);
}

.container {
    max-width: calc((900 / 16) * 1rem);
    margin: 0 auto;
}


.flex-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.main-heading {
    text-transform: lowercase;
    letter-spacing: 1.5px;
    line-height: 1.2;
    font-size: var(--fs-600);
    color: var(--clr-secondary--200);
    font-family: var(--font-bold);
    margin-bottom: calc((10 / 16) * 1rem);
}

.tertiary-heading {
    color: var(--clr-primary--200);
    font-family: var(--font-regular);
    font-size: var(--fs-200);
}

.add-button {
    width: auto;
    height: auto;
    border-radius: 50%;
    border: 0;
    padding: .75rem;
    background-color: var(--clr-primary--300);
    cursor: pointer;
    transition: all .2s;
    transform: translateY(-10px);
}

.add-button-icon {
    stroke: var(--clr-primary);
    transition: all .2s;
}

.add-button:hover {
    background-color: var(--clr-primary);
}

.add-button:hover .add-button-icon {
    stroke: var(--clr-neutral);
    transform: rotate(-90deg);
}

/* HEADER */

.header {
    padding: 2.5rem 1rem 1rem .75rem;
    position: relative;
    margin-bottom: 2rem;
}

.header__logo-icon {
    stroke: var(--clr-neutral--300);
}

.header__select-control {
    background-color: red;
}


.header__github-icon {
    height: 36px;
    width: 36px;
    fill: var(--clr-neutral--300);
    transition: all .2s;
}

.header__github-link:hover .header__github-icon,
.header__github-link:active .header__github-icon {
    fill: var(--clr-neutral--600);
}

.header nav a:link,
.header nav a:visited {
    display: inline-block;
    padding-left: 1rem;
    padding-right: .5rem;
    border-left: 1px solid var(--clr-neutral--400);
    text-decoration: none;
}

/* POST HEADER */

.post-header {
    padding: .5rem .5rem 1.5rem .5rem;
    border-bottom: 1px solid var(--clr-neutral--500);
}

.post-header.flex-wrapper {
    justify-content: space-between;
}

/* MAIN */

.library {
    margin-top: 5rem;
    padding: .5rem .5rem 1.5rem .5rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(16.25rem, 1fr));
    gap: 2rem;
}

.library__book {
    padding: 1rem;
    background-color: var(--clr-neutral);
    border-radius: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    border: 2px solid var(--clr-neutral--200);
}

.library__book-avatar-box {
    flex-basis: 20%;
    display: flex;
    justify-content: center;
}


.library__book-avatar-icon {
    height: 4rem;
    width: 4rem;
}

.library__book-info-box {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.library__book-info-box > div {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.library__book-info-box > div:last-child span {
    color: var(--clr-secondary--200);
    font-size: var(--fs-200);
}

.library__book-info-heading {
    color: var(--clr-secondary--200);
    font-family: var(--font-regular);
    font-weight: 400;
    letter-spacing: .25px;
    text-align: center;
}

.library__book-info-author {
    color: rgb(0, 115, 235);
    font-size: var(--fs-100);
    letter-spacing: .25px;
}

.library__book-info-pages {
    color: var(--clr-secondary--200);
    font-family: var(--font-medium);
    font-size: var(--fs-100);
}

.library__book-read-box {
    display: flex;
}

.library__book-read {
    appearance: none;
    height: 1.5rem;
    width: 3rem;
    border-radius: 5rem;
    background-color: var(--clr-secondary--300);
    position: relative;
    cursor: pointer;
    transition: all .3s;
    margin-left: 1rem;
}

.library__book-read::after {
    content: "";
    position: absolute;
    left: .125rem;
    top: 50%;
    transform: translateY(-50%);
    height: 1.25rem;
    width: 1.25rem;
    border-radius: 50%;
    background-color: var(--clr-neutral--200);
    transition: all .3s;
}

.library__book-read:checked {
    background-color: var(--clr-primary);
}

.library__book-read:checked::after {
    background-color: var(--clr-neutral);
    transform: translate(calc(100% + .25rem), -50%);
}

.library__book-icon-box {
    background-size: cover;
}

/* MODAL */

.modal {
    display: block;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    padding: 2.5rem;
    border: none;
    background-color: transparent;
    transition: all .2s;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    width: 16.25rem;
    padding: 0 .5rem 0 0;
}

.modal[open] {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
    transform: translate(-50%, -50%) scale(1);
}

.modal__row {
    background-color: var(--clr-primary);
    padding: 1.5rem 2rem;
    border-radius: 1rem;
}

.modal__row.flex-wrapper {
    gap: 1rem;
}

.modal__heading {
    color: var(--clr-neutral);
    font-size: var(--fs-300);
    letter-spacing: .25px;
}

.modal__close-button,
.library__book-close-button {
    cursor: pointer;
    border: none;
    font-size: max(16px, var(--fs-400));
    height: 2.5rem;
    width: 2.5rem;
    overflow: hidden;
    position: relative;
    border-radius: calc((12 / 16) * 1rem);
    transition: background-color .2s;
}

.library__book-close-button {
    height: 2rem;
    width: 2rem;
    border-radius: calc((8 / 16) * 1rem);
}

.library__book-close-button {
    background-color: var(--clr-primary);
}

.library__book-close-button:hover,
.library__book-close-button:active {
    background-color: var(--clr-neutral);
}

.modal__close-button::after,
.modal__close-button::before,
.library__book-close-button::after,
.library__book-close-button::before {
    content: "";
    height: 1.25rem;
    width: 2px;
    position: absolute;
    top: 50%;
    left: 50%;

    background-color: var(--clr-secondary);
    transition: all .3s;
}

.library__book-close-button::after,
.library__book-close-button::before {
    background-color: var(--clr-neutral--200);
}

.modal__close-button::after,
.library__book-close-button::after {
    transform: translate(-50%, -50%) rotate(45deg);
}

.modal__close-button::before,
.library__book-close-button::before {
    transform: translate(-50%, -50%) rotate(-45deg);
}

.modal__close-button:hover::after,
.modal__close-button:active::after,
.library__book-close-button:hover::after,
.library__book-close-button:active::after {
    transform: translate(-30px, 15px) rotate(45deg);
    background-color: var(--clr-secondary);
}

.modal__close-button:hover::before,
.modal__close-button:active::before,
.library__book-close-button:hover::before,
.library__book-close-button:active::before {
    transform: translate(30px, 15px) rotate(-45deg);
    background-color: var(--clr-secondary);
}

.modal__close-button span,
.library__book-close-button span {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
}

.modal__close-button span::after,
.modal__close-button span::before,
.library__book-close-button span::after,
.library__book-close-button span::before {
    content: "";
    height: 1.25rem;
    width: 2px;
    position: absolute;
    top: 50%;
    left: 50%;

    transition: all .3s; 
    background-color: var(--clr-neutral);
}

.modal__close-button span::after,
.library__book-close-button span::after {
    left: auto;
    transform: translate(30px, -35px) rotate(45deg);
}

.modal__close-button span::before,
.library__book-close-button span::before {
    transform: translate(-30px, -35px) rotate(-45deg);
}

.modal__close-button:hover span::after,
.modal__close-button:active span::after,
.library__book-close-button:hover span::after,
.library__book-close-button:active span::after {
    transform: translate(-50%, -50%) rotate(45deg);
    background-color: var(--clr-secondary);
}

.modal__close-button:hover span::before,
.modal__close-button:active span::before,
.library__book-close-button:hover span::before,
.library__book-close-button:active span::before {
    transform: translate(-50%, -50%) rotate(-45deg);
    background-color: var(--clr-secondary);
}

.modal__form {
    border-radius: 1rem;
    padding: 1.5rem;
    margin-top: 1.5rem;
    background-color: var(--clr-neutral);
}

.modal__form ul {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    list-style: none;
}

.modal__form ul li:last-child {
    display: flex;
    align-items: center;
    gap: 1.5rem;
} 

.modal__form label {
    display: inline-block;
    color: var(--clr-secondary);
    font-size: var(--fs-200);
    margin-bottom: calc((6 / 16) * 1rem);
}

.modal__form ul li:last-child label {
    margin-bottom: 0;
}

.modal__form input {
    background-color: var(--clr-neutral--200);
}

.modal__form input:not([type=checkbox]) {
    border-radius: 6px;
    height: auto;
    font-size: var(--fs-200);
    color: var(--clr-secondary);
    padding: .25rem .5rem;
    box-shadow: none;
    border: 0;
}

.modal__form input:hover {
    outline: 2px solid var(--clr-primary);
}

.modal__form input:not([type=checkbox]):focus {
    outline: 2px solid var(--clr-primary);
}

.modal__form input[type=checkbox],
.modal__form input[type=number] {
    appearance: none;
}

.modal__form input[type=checkbox] {
    border-radius: 3px;
    height: 1.25rem;
    width: 1.25rem;
    cursor: pointer;
    position: relative;
    background-color: var(--clr-neutral--500);
}

.modal__form input[type=checkbox]::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--clr-primary);
    border-radius: 3px;
    height: .75rem;
    width: .75rem;
    opacity: 0;
}

.modal__form input[type=checkbox]:checked::after {
    opacity: 1;
}

.modal__form input[type=number]::-webkit-outer-spin-button,
.modal__form input[type=number]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.modal__submit-button {
    margin-top: 2rem;
    border: none;
    border-radius: 9px;
    background-color: var(--clr-secondary);
    color: var(--clr-neutral);
    height: auto;
    width: 100%;
    cursor: pointer;
}