style.css

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

:root {
    --background-primary-color : #6f4c37;
    --color-h1 : #dacbcb;
    --primary-color : #dacbcb;
    --color-hover : #6f4c37;
    --background-hover : #dacbcb;
    --primary-transition: all 0.5s ease;
    --delete : #d14c4c;
    --shadow-hover : #b3944c;
    --shadow : #0f0f0f;

}

body {
    padding: 3px;
    height: 100vh;
    background-image: url(img/parchemin.jpg);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

header {
    display: flex;
    height: 40px;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

nav h1,
nav ul {
    margin: 3px;
}

nav>h1 {
    font-size: 1.5rem;
    color: var(--background-hover);
}

nav>div>ul {
    list-style: none;
}

a {
    display: none;
}

.counter-position {
    display: flex;
    align-items: center;
}

.counter {
    color: var(--background-hover);
}

.fa-refresh {
    padding-right: 0.5rem;
    font-size: 1rem;
    color: var(--delete);
    text-shadow: 2px 2px 2px var(--shadow);
    transition: .3s;
}

.fa-refresh:hover {
    text-shadow: 2px 2px 2px var(--shadow-hover);
    transform: rotate(45deg);
    cursor: pointer;
}

.clear {
    margin: 2px;
}

input {
    float: none;
    width: 60%;
}

form {
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 35px;
}

form input,
form button,
.task {
    background: var(--background-primary-color);
    border: none;
    font-size: 0.8rem;
    color: var(--color-h1);
    padding: 0.3rem;
}

form input {
    border-top-left-radius: 0.4rem;
    border-bottom-left-radius: 0.4rem;
}

form button {
    border-top-right-radius: 0.4rem;
    border-bottom-right-radius: 0.4rem;
    cursor: pointer;
    margin-right: 9px;
}

form button:hover {
    background: var(--background-hover);
    color: var(--color-hover);
}

select {
    background: var(--background-primary-color);
    border: none;
    font-size: 1rem;
    color: var(--primary-color);
    padding: 0.3rem;
    border-radius: 0.4rem;
    margin: 0.5rem;
    cursor: pointer;
    text-decoration: none;
}

.select {
    display: none;
}

.btn-burger {
    display: block;
}

.menu > li {
    overflow: hidden;
}

.menu {
    display: flex;
    position: absolute;
    top: 90px;
    right: 10px;
    list-style-type: none;
    flex-direction: column;
    justify-content: center;
    background: var(--background-primary-color);
    color: var(--primary-color);
    margin: 0;
    padding: 0;
}

.menu > li {
    margin: 0 1rem;
    overflow: hidden;
}

.menu-button-container {
    display: flex;
    height: 100%;
    width: 30px;
    cursor: pointer;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.menu-button,
.menu-button::before,
.menu-button::after {
    display: block;
    background-color: #fff;
    position: absolute;
    height: 2px;
    width: 23px;
    transition: transform 400ms cubic-bezier(0.23, 1, 0.32, 1);
    border-radius: 2px;
}

.menu-button::before {
    content: '';
    margin-top: -8px;
}

.menu-button::after {
    content: '';
    margin-top: 8px;
}

#menu-toggle {
    display: none;
}

#menu-toggle ~ .menu li {
    height: 0;
    margin: 0;
    padding: 0;
    border: 0;
    transition: height 400ms cubic-bezier(0.23, 1, 0.32, 1);
}

#menu-toggle:checked ~ .menu li {
    height: 2.5em;
    padding: 0.5em;
    transition: height 400ms cubic-bezier(0.23, 1, 0.32, 1);
}

#menu-toggle:checked ~ .menu li:hover {
    background: var(--background-hover);
    color: var(--color-hover);
    cursor: pointer;
}

#menu-toggle:checked + .menu-button-container .menu-button::before {
    margin-top: 0px;
    transform: rotate(405deg);
}

#menu-toggle:checked + .menu-button-container .menu-button {
    background: rgba(255, 255, 255, 0);
}

#menu-toggle:checked + .menu-button-container .menu-button::after {
    margin-top: 0px;
    transform: rotate(-405deg);
  }

.check-btn,
.delete-btn {
    padding: 0.2rem;
}

.todo {
    width: 60%;
    margin: auto;
    list-style: none;
}

.task {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 0.2rem;
    padding: 0;
    color: var(--primary-color);
    transition: all .5s ease;
    border-radius: 0.4rem;
}

.newTask {
    flex: 1;
    padding: 0rem .4rem;
    color: var(--primary-color);
}

.check-btn,
.delete-btn {
    font-size: 0.8rem;
    background: var(--background-primary-color);
    color: var(--primary-color);
    border: none;
    padding: 0.3rem;
    margin-right: 0.5rem;
    cursor: pointer;
    transition: var(--primary-transition);
    border-radius: 0.4rem;
}

.check-btn:hover,
.delete-btn:hover {
background: var(--background-hover);
    color: var(--color-hover);
}

.fa-trash,
.fa-check {
    pointer-events: none;
}

.achieved {
    text-decoration: line-through;
    opacity: 0.5;
}

.transighost{
    transform: translateX(16rem);
    opacity: 0;
}

main {
    height: calc(100vh - 95px);
}

.pencil {
    display: none;
}

footer {
    display: block;
    height: 40px;
}

footer>p {
    color: var(--color-h1);
    font-size: 0.6rem;
    margin: 2px;
}

.date {
    color: var(--color-h1);
    text-transform: capitalize;
    font-size: 1rem;
}

@media screen and (min-width: 660px) {

    header {
        height: 80px;
    }

    nav>h1 {
        font-size: 2rem;
    }

    a {
        display: block;
        text-decoration: none;
        font-size: 1.5rem;
        color: var(--background-hover);
    }

    .fa-refresh {
        font-size: 1.5rem;
    }

    nav>div>ul {
        font-size: 1.5rem;

    }

    .todo {
        width: 60%;
    }

    main {
        height: calc(100vh - 160px);
    }

    form {
        height: 70px;
        margin-bottom: 10px;
    }

    form input, 
    form button, 
    .task {
        font-size: 1.5rem;
    }

    .task {
        margin: 0.5rem;
    }

    form button {
        margin-right: 30px;
    }

    .check-btn, 
    .delete-btn {
        font-size: 1.5rem;
        margin-right: 1.5rem;
    }

    .menu {
        top: 181px;
        right: 50px;
    }

    .menu-button, 
    .menu-button::before, 
    .menu-button::after {
        height: 4px;
        width: 27px;
    }

    .menu li {
        font-size: 1.5rem;
    }

    footer {
        height: 60px;
    }
    
    footer>p {
        font-size: 1rem;
    }
    
    .date {
        font-size: 1.5rem;
    }

}

@media screen and (min-width: 1100px) {
    
    nav>h1 {
        font-size: 3.5rem;
    }

    a {
        font-size: 2rem;
    }

    .fa-refresh {
        font-size: 2rem;
        padding-right: 1rem;
    }

    .todo {
        width: 30%;
    }

    main {
        height: calc(100vh - 140px);
    }

    input {
        max-width: 30%;
    }

    .select {
        display: block;
    }
    
    .btn-burger {
        display: none;
    }

    .pencil {
        display: block;
        position: absolute;
        top: 305px;
        left: -179px;
        rotate: 50deg;
    }

    footer {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: baseline;
        padding: 0 5px;
        height: 40px;
        width: 100%;
    }

}