/* CSS Reset*/
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS variable */
:root {
    --white: #ffffff;
    --amber-light: #fef3c7;
    --amber: #fbbf24;
    --amber-dark: #f59e0b;
    --blue: #155e75;
    --blue-dark: #164e63;
    --red: #ef4444;
    --green: #81b622;

    --normal-shadow: 5px 5px 5px rgba(0, 0, 0, 0.2);
    --smaller-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
    --radius-small: 15px;
    --radius-circle: 50%;
    --bold: 700;
}

/* Body */
body {
    width: 100vw;
    height: 100vh;
    display: grid;
    grid:
        [row1-start] 'header' 1fr [row1-end]
        [row2-start] 'library' 5fr [row2-end];

    font-family: 'Roboto', sans-serif;
}

/* Header */
header {
    grid-area: header;
    display: grid;
    grid:
        'logo button'
        / 2fr 1fr;
    align-items: center;

    background-color: var(--blue);
}

div.header-logo {
    grid-area: logo;
    display: flex;
    justify-content: start;
    align-items: center;
}

div.header-btn {
    grid-area: button;
    justify-self: center;
}

div.header-logo svg {
    margin-right: 2rem;
}

div.header-logo svg,
div.header-logo h1 {
    color: var(--amber);
}

div.header-logo h1,
div.header-btn button .header-btn-plus {
    font-size: 3rem;
}

div.header-logo h1,
div.header-btn button {
    font-family: 'Roboto Slab', serif;
}

div.header-btn button {
    padding: 1.5rem;
    margin: 1rem;

    font-size: 1.5rem;
    border-radius: var(--radius-circle);
    background-color: var(--amber);
    color: var(--blue);
    border: 1px solid var(--amber);
    box-shadow: var(--normal-shadow);
}

div.header-btn button:active {
    transform: translateY(4px);
    box-shadow: var(--smaller-shadow);
}

div.header-btn button:hover {
    background-color: var(--amber-dark);
    color: var(--blue-dark);
}

div.header-btn button:disabled {
    transform: none;
    box-shadow: var(--smaller-shadow);
}

/* Section library */
section.library-wrapper {
    grid-area: library;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    justify-items: center;

    align-content: flex-start;
    background-color: var(--white);
}

/* Cards (books) and add book form*/
div.card,
div.card form,
.card-footer {
    display: flex;
    flex-direction: column;
}

div.card {
    justify-content: space-between;
    align-items: flex-start;
    width: max(250px, 5rem);
    height: max(300px, 6rem);
    margin-top: 2rem;
    padding: 1rem;

    background-color: var(--amber);
    border: 2px solid var(--blue);
    box-shadow: var(--normal-shadow);
    border-radius: var(--radius-small);
    color: var(--blue-dark);
    font-weight: var(--bold);
}

div.card form {
    align-items: flex-start;
}

.card-footer {
    font-size: 0.9rem;
}

div.card button {
    padding: 0.3rem;
    margin: 0.5rem;

    background-color: var(--blue);
    color: var(--amber);
    border-radius: var(--radius-small);
    border: 1px solid var(--blue);
    font-weight: var(--bold);
    box-shadow: var(--normal-shadow);
    min-width: 6rem;
}

div.card button:active {
    transform: translateY(2px);
    box-shadow: var(--smaller-shadow);
}

div.card button:hover {
    background-color: var(--blue-dark);
    color: var(--amber-dark);
}

/* Toggle button in card and form */
div.card-footer,
form {
    position: relative;
}

/* Standard checkbox reset and toggle background*/
div.card-footer input[type='checkbox'],
form input[type='checkbox'] {
    -webkit-appearance: none;
    appearance: none;
    width: 3rem;
    height: 1.5rem;
    background: var(--red);
    transition: all 0.4s;
}

div.card-footer input[type='checkbox']:checked,
form input[type='checkbox']:checked {
    background-color: var(--amber);
    transition: all 0.4s;
}

/* Read position*/
div.card-footer input[type='checkbox']:checked::before {
    top: 35%;
    left: 23%;
}

form input[type='checkbox']:checked::before {
    left: 14%;
    top: 71%;
}

/* Not read position */
div.card-footer input[type='checkbox']::before {
    top: 35%;
    left: 0%;
}

form input[type='checkbox']::before {
    top: 71%;
    left: 0%;
}

div.card-footer input[type='checkbox']:checked::before,
form input[type='checkbox']:checked::before {
    transition: all 0.4s;
}

/* Toggle ball style*/
div.card-footer input[type='checkbox']::before,
form input[type='checkbox']::before {
    width: 1.3rem;
    height: 1.3rem;
    border-radius: var(--radius-circle);
    background-color: var(--blue);
    content: '';
    position: absolute;
    transition: all 0.4s;
}

/* Add book form*/
input {
    border-radius: var(--radius-small);
    border: 2px solid var(--blue);
}

input[type='text'],
input[type='number'] {
    padding: 0.3rem;
    width: 12rem;
    margin-bottom: 0.5rem;
    border-radius: var(--radius-small);
    border: 2px solid var(--blue);
    color: var(--blue);
    font-weight: var(--bold);
}

input[type='text']:focus,
input[type='number']:focus {
    outline-color: var(--amber);
}

input[type='text']:valid,
input[type='text']:focus:valid,
input[type='number']:valid,
input[type='number']:focus:valid
  { outline: none;
    border: 3px solid var(--green);
}

input[type='text']:invalid,
input[type='text']:focus:invalid,
input[type='number']:invalid,
input[type='number']:focus:invalid
  { outline: none;
    border: 3px solid var(--red);
}

  .info-message {
    font-size: 0.8rem;
  }