* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

:root {
    --blue: royalblue;
    --scrollbar-clr: #717171;
    --light-text: #727f91;
    --primaryClr: #eb902e;
    --secondaryClr: #656f7c;
    --color-white:#fff;
    --bgClr: #222734;
    --dark-bg: #202123;
    --container-bg: #202123d6;
    --hover-dark: #2a2b32;
    --active-dark: #343541;
    --dark-box: #202020;
    --switch-clr: #283140;
    --switch-bg-clr:#4cc2ff;
    --btn-shadow: 5px 5px 16px rgba(0, 0, 0, 0.275);

    /* ------------- 3d btn gradiants--------------- */
    --btn-gradiant: 120deg, #484a58, #313440;
    --btn-before-gradiant: 120deg, #31333d, #434655;
    
    --btn-primary-gradiant: 120deg, #f9a448, #c77217;
    --btn-primary-before-gradiant: 120deg, #ad5f0d, #ffa03a;
    
    --btn-secondary-gradiant: 120deg, #7a8798, #4b5562;
    --btn-secondary-before-gradiant: 120deg, #535c68, #798593;
}

.light {
    --btn-secondary-gradiant: 120deg, #bac6d6, #697380;
    --btn-secondary-before-gradiant: 120deg, #717c8a, #c1ccdb;

    --btn-gradiant: 120deg, #d9dfe9, #99a2af;
    --btn-before-gradiant: 120deg, #9aa2ae, #dee5f0;

    --btn-shadow: 5px 5px 10px rgba(0, 0, 0, 0.122);
    --switch-clr: #d9dfe9;
    --switch-bg-clr:#bdc1e4;
    --scrollbar-clr: #c5cedb;
    --container-bg: #e4e8f467;
    --light-text: #8f9db1;
    --color-white:#485361;
    --primaryClr: #eb902e;
    --secondaryClr: #656f7c;
    --bgClr: #e4e8f4;
    --dark-bg: rgb(226, 234, 237);
    --hover-dark: #c3c8e9;
    --active-dark: #a3a6bf;
    --dark-box: #cdd1dd;
}

.pop {
    position: relative;
}

.pop::before {
    content: '';
    position: absolute;
    background-color: red;
    border-radius: 50%;
    aspect-ratio: 1;
    width: 8px;
    top: 0;
    right: 0;
}


.history-icon{
    display: none;
    background-image: url(images/icon-history.svg);
    background-size: 70%;
}
.light .history-icon{
    background-image: url(images/icon-history-dark.svg);
}
.prev {
    background: url('images/icon-previous.svg');
    background-size: 30%;
}
.light .prev{
    background: url('images/icon-previous-dark.svg') no-repeat center;
    background-size: 30%;
}

.next {
    background: url('images/icon-next.svg');
    background-size: 30%;
}
.light .next{
    background: url('images/icon-next-dark.svg') no-repeat center;
    background-size: 30%;
}

.hamburger {
    background-image: url(images/icon-menu.svg);
    background-size: 50%;
    display: none;
}
.light .hamburger{
    background-image: url(images/icon-menu-dark.svg);
}

.delete {
    background-image: url(images/icon-delete.svg);
}
.light .delete{
    background-image: url(images/icon-delete-dark.svg);
}

.book {
    background-size: 70%;
    background-image: url(images/book-alt.svg);
}
.light .book {
    background-image: url(images/book-alt-dark.svg);
}

.icon {
    background-repeat: no-repeat;
    background-position: center center;
    aspect-ratio: 1;
    width: 32px;
    border-radius: 5px;
    cursor: pointer;
}

.icon:hover {
    background-color: rgba(100, 100, 100, 0.328);
}

body {
    background-color: var(--dark-bg);
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
    height: 100vh;
    overflow: hidden;
}

body>.container {
    box-shadow: 0px 0px 50px rgba(0, 0, 0, 0.345);
    background-color: var(--container-bg);
    max-width: 1200px;
    height: 100svh;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
    display: flex;
    gap: 16px;
}

body>.container::before {
    opacity: .3;
    position: absolute;
    content: '';
    width: 50%;
    aspect-ratio: 1;
    border-radius: 50%;
    background-color: #e1911a;
    z-index: -1;
    filter: blur(50px);
}

body>.container::after {
    opacity: .3;
    position: absolute;
    right: 0;
    top: 50%;
    content: '';
    width: 50%;
    aspect-ratio: 1;
    border-radius: 50%;
    background-color: #1df3fa;
    background-color: #173562;
    z-index: -1;
    filter: blur(100px);
}

main {
    width: 100%;
    font-family: sans-serif;
    position: relative;
    display: grid;
    grid-template-rows: 50px auto;
    grid-template-columns: 300px auto;
    grid-gap: 16px;
}

main>header {
    width: 100%;
    /* background-color: var(--dark-bg); */
    /* border: 1px solid white; */
    grid-column: 1/3;
    position: sticky;
    top: 0;
    /* box-shadow: 0px 10px 20px rgba(0, 0, 0, 0.24); */
    padding: 8px 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 20px;
    text-transform: capitalize;
    color: white;
    z-index: 2;
}

main>header .mode {
    color: var(--color-white);
    font-size: 14px;
}

main>header .left {
    display: flex;
    align-items: center;
    gap: 16px;
}

main>header .right {
    display: flex;
    align-items: center;
}

.navigation-btns {
    display: flex;
    gap: 2px;
    margin-right: 16px;
}




/* ======================================= */
/* ================ MENU ============== */
/* ======================================= */

main menu {
    margin-top: -66px;
    box-shadow: 10px 0px 20px rgba(0, 0, 0, 0.24);
    overflow: hidden;
    font-size: 14px;
    text-transform: capitalize;
    width: 300px;
    background-color: var(--dark-bg);
    color: white;
    height: 100svh;
    position: relative;
    border-top-right-radius: 8px;
    border-bottom-right-radius: 8px;
    transition: .15s;
    z-index: 1;
}
.light main menu {
    box-shadow: 10px 0px 20px rgba(0, 0, 0, 0.1);
}
main menu.active {
    left: 0;
}

main menu header {
    height: 50px;
    padding: 8px 8px;
    border-bottom: 1px solid var(--active-dark);
}

menu .container {
    padding: 8px;
    overflow-y: scroll;
    height: calc(100% - 100px);
}

menu .container::-webkit-scrollbar {
    border-radius: 10px;
    width: 8px;
    height: 8px;
}

menu .container::-webkit-scrollbar-thumb {
    background-color: var(--scrollbar-clr);
    border-radius: 10px;
    visibility: hidden;
    opacity: 0;
}

menu .container:hover::-webkit-scrollbar-thumb {
    visibility: visible;
    opacity: 1;
}

menu section .section-heading {
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--light-text);
    margin: 12px 0;
    margin-left: 4px;
}

menu li {
    list-style-type: none;
    font-weight: 400;
    font-size: 14px;
    padding: 14px 16px;
    border-radius: 4px;
    margin-bottom: 4px;
    position: relative;
    color: var(--color-white);
}

li.done {
    position: relative;
}

li.done::before {
    content: '';
    position: absolute;
    width: 8px;
    aspect-ratio: 1;
    border-radius: 4px;
    background-color: rgb(44, 160, 255);
    top: 50%;
    transform: translateY(-50%);
    right: 8px;
}

menu li:hover {
    background-color: var(--hover-dark);
    cursor: pointer;
}

menu li.active {
    /* background-color: var(--active-dark); */
    background-color: var(--active-dark);
}
.light li.active{
    color: #fff;
}

menu li.active::before {
    position: absolute;
    content: '';
    width: 5px;
    height: 70%;
    background-color: lightblue;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
}

menu .theme {
    display: flex;
    align-items: center;
    border-top: 1px solid var(--active-dark);
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 50px;
    padding: 16px;
    font-weight: 600;
    color: var(--light-text);
}

#theme-toggle {
    margin-right: 4px;
    width: 48px;
    height: 24px;
    background:var(--switch-bg-clr);
    border-radius: 50px;
    position: relative;
    cursor: pointer;
}

#theme-toggle .switch {
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.2);
    aspect-ratio: 1;
    height: 24px;
    background-color: var(--switch-clr);
    position: absolute;
    border-radius: 50%;
    top: 0;
    right: 0;
    transform: scale(.8);
    transition: .3s ease-in-out;
}

.light #theme-toggle .switch {
    right: 24px;
}




.theme label {
    font-weight: 400;
}

/* body.dark */

/* ======================================= */
/* ================ CALCULATOR ============== */
/* ======================================= */

main .calculator {
    padding: 40px 32px;
    font-family: monospace;
    width: 100%;
    max-width: 500px;
    /* height: 100%; */
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-radius: 60px;
    position: relative;
    z-index: 1;
    background-color: var(--bgClr);
    box-shadow: 10px 10px 20px rgba(0, 0, 0, 0.201);
    margin-bottom: 16px;
}
.light .calculator::before,
.light .calculator::after{
    opacity: .5;
}
.calculator::before,
.calculator::after {
    position: absolute;
    aspect-ratio: 1;
    border-radius: 50%;
    opacity: .3;
    content: '';
    z-index: -1;
    filter: blur(100px);
}

.calculator::before {
    width: 110%;
    background-color: #90a3bf;
    top: -40%;
    left: -40%;
}

.calculator::after {
    width: 90%;
    right: -30%;
    bottom: -30%;
    background-color: #e1911a;
}

.btn-container.scientific .btn {
    border-radius: 24px;
}

.calculator input {
    font-family: monospace;
    width: 100%;
    text-align: right;
    font-size: 40px;
    padding: 16px 4px;
    margin-bottom: 20px;
    border: none;
    outline: none;
    background-color: transparent;
    color: var(--color-white);
}

.calculator input::placeholder {
    color: var(--color-white);
}

.calculator .btn-wrapper {
    height: 100%;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(7, auto);
    grid-gap: 4px;
}

.standard .btn:last-child {
    grid-column: 3/5;
}

.calculator .btn {
    padding: 12px 16px;
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}




/* ----------- btns ------------- */
.btn-wrapper .btn {
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 32px;
    background: linear-gradient(var(--btn-gradiant));
    position: relative;
    box-shadow: var(--btn-shadow);
    z-index: 1;
    cursor: pointer;
    transition: .2s;
}

.btn-wrapper .btn::before {
    content: '';
    position: absolute;
    inset: 5px;
    background: linear-gradient(var(--btn-before-gradiant));
    border-radius: 32px;
    filter: blur(4px);
    z-index: -1;
}

/* ----------- btns secondary ------------- */
.btn.secondary {
    background: linear-gradient(var(--btn-secondary-gradiant));
}
.btn.secondary::before {
    background: linear-gradient(var(--btn-secondary-before-gradiant));
}

/* ----------- btns primary ------------- */
.btn.primary{
    background: linear-gradient(var(--btn-primary-gradiant));
}
.btn.primary::before {
    background: linear-gradient(var(--btn-primary-before-gradiant));
}



.btn:hover::before {
    inset: 6px;
    border-radius: 30px;
}

.btn:hover {
    transform: scale(.95);
}

/* ======================================= */
/* ================ history ============== */
/* ======================================= */


#histories {
    /* border: 1px solid white; */
    position: relative;
    font-family: sans-serif;
    width: 600px;
    position: relative;
    overflow: hidden;
    height: 100vh;
}

#histories header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: white;
    text-transform: capitalize;
    font-weight: 500;
    padding: 14px 16px;
    height: 48px;
}

#histories header .right {
    display: flex;
}


#histories header h3 {
    display: inline-block;
    padding-bottom: 4px;
    border-bottom: 3px solid lightblue;
}

#histories header .navigation-btns {
    display: none;
}

#histories .history-container {
    height: 500px;
    height: 500px;
    height: calc(100% - 50px);
    /* border: 1px solid black; */
    overflow: scroll;
    padding-right: 8px;
    text-align: right;
}

.history-container.empty::before {
    position: absolute;
    content: 'History is empty';
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--color-white);
    font-weight: 400;
    font-size: 14px;
    letter-spacing: .4px;
}

#histories .history-container::-webkit-scrollbar {
    display: none;
}

.history-container .history {
    border-radius: 5px;
    padding: 12px 16px;
    margin-bottom: 8px;
    border: 2px solid transparent;
    font-family: monospace;
    overflow: hidden;
}

.history-container .history.active,
.history-container .history:hover {
    /* background-color: rgba(31, 31, 31, 0.538); */
    background-color: var(--hover-dark);
    cursor: pointer;
}

.history-container .history.current {
    background-color: var(--hover-dark);
    border: 2px solid var(--bgClr);
}

.history-container .query,
.history-container .where {
    font-size: 16px;
    color: #9980ff;
}

.history-container .result {
    margin-top: 4px;
    color: var(--color-white);
    font-size: 18px;
}


#notification{
    white-space: nowrap;
    transition: .5s ease-in-out;
    width: 500px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom-left-radius: 14px;
    border-bottom-right-radius: 14px;
    background-color: var(--bgClr);
    position: fixed;
    padding: 24px 32px;
    z-index: 10;
    font-family: sans-serif;
    color: var(--color-white);
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.331);
    opacity: 0;
}
.light #notification{
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.135);
}
#notification.active{
    top: 0;
    opacity: 1;
}
.historyOverlay::before,
.menuOverlay::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    background-color: rgba(0, 0, 0, 0.66);
    width: 100vw;
    height: 100vh;
    z-index: 3;
}

.clear-history-overlay{
    font-family: sans-serif;
    position: fixed;
    width: 100vw; 
    height: 100vh;
    background-color:rgba(6, 17, 22, 0.4);
    z-index: 20;
    display: none;
}

.clear-history-overlay.active{
    display: block;
}
.clear-history{
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.331);
    position: absolute;
    max-width: 500px;
    background-color: var(--bgClr);
    z-index: 10;
    padding: 32px;
    text-align: center;
    border-radius: 40px;
    color: var(--color-white);
    
}
.light .clear-history{
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.135);
}
.clear-history h3{
    text-transform: capitalize;
    color: var(--color-white);
}
.clear-history p{
    margin: 24px 0;
}
.clear-history .btn-container{
    display: flex;
    align-items: center;
    gap: 8px;
}
.clear-history .btn-container button{
    border: none;
    outline: none;
    border-radius: 50px;
    background-color: var(--blue);
    color: white;
    padding: 12px 16px;
    min-width: 150px;
    text-transform: capitalize;
    font-size: 16px;
    cursor: pointer;
}
.clear-history .btn-container button:hover{
    filter: brightness(.85);
}
/* ======================================= */
/* ============= MEDIA QUERIES =========== */
/* ======================================= */
@media screen and (max-width: 1100px) {
    .hamburger {
        display: block;
    }

    main menu {
        position: absolute;
        top: 0;
        left: -300px;
        z-index: 10;
        margin-top: 0;
    }

    main {
        grid-template-columns: 1fr;
    }

    main .calculator {
        margin-left: auto;
        margin-right: auto;
        width: 500px;
    }
}

@media screen and (max-width: 840px) {
    #notification{
        width: 100%;
        height: 56px;
    }
    .clear-history{
        border-radius: 20px;
        width: 100%;
    }
    .clear-history p{
        margin: 14px 0;
    }
    .clear-history .btn-container button{
        min-width: auto;
        width: 100%;
    }
    body {
        gap: 0;
    }
    main {
        gap: 0;
    }
    main>header {
        box-shadow: 0px 5px 10px rgba(0, 0, 0, 0.082);
    }

    main .calculator {
        width: 100%;
        margin-top: 10px;
        padding: 30px 10px;
        border-radius: 40px;
        border: none;
    }

    .calculator input {
        font-size: 30px;
        border-radius: 5px;
    }
    #history-icon {
        display: block;
        margin-right: 6px;
    }

    #histories header {
        padding: 8px;
    }


    #histories {
        backdrop-filter: blur(100px);
        position: absolute;
        height: 75vh;
        width: 100%;
        bottom: -100%;
        left: 0;
        transition: .1s;
        background-color: rgba(31, 31, 31, 0.503);
        transition: .3s;
        z-index: 3;
        box-shadow: 0px -10px 20px rgba(0, 0, 0, 0.24);
    }
    .light #histories{
        background-color: var(--dark-bg);
    }

    #histories.active {
        bottom: 0;
    }

    .history-container {
        padding-left: 8px;
    }

    .history-container .query {
        font-size: 14px;
    }

    .history-container .result {
        font-size: 20px;
    }

    #histories .history.active,
    #histories .history:hover {
        background-color: var(--hover-dark);
    }

    #histories header .navigation-btns {
        display: flex;
    }
}