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

:root {
    --background-color: #333;
    --background-button-color: #1a1a1a;
    --text-color: wheat;
    --delete-color: red;

    /* padding variables*/
    --padding-xs: 5px;
    --padding-s: 10px;
    --padding-m: 15px;
    --padding-l: 20px;
    --padding-xl: 30px;
    --padding-xxl: 50px;

    /* border radius variables*/
    --border-radius-xs: 5px;
    --border-radius-s: 10px;
    --border-radius-m: 15px;
    --border-radius-l: 20px;
    --border-radius-xl: 30px;
    --border-radius-xxl: 50px;
}

main {
    height: 100%;
    display: flex;
    flex-direction: column;
}

html,
body {
    background-color: #000000;
    color: var(--text-color);
    height: 100%;
    width: 100%;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

/* navigation setting */
nav {
    border: 2px solid saddlebrown;
    padding: 10px;
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

#togglemodal{
    background-color: var(--background-button-color);
    color: wheat;
    cursor: pointer;
    outline: none;
    padding: 12px 12px;
    border: none;
    border-radius: var(--border-radius-s);
}

/* sections setting */
section {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    flex-grow: 1;
    gap: 30px;
}

/* all columns */
section .taskcolumn {
    border: 2px solid #333;
    flex-grow: 1;
    width: 100%;
    padding: 20px;
    display: flex;
    background-color: #333;
    flex-direction: column;
    gap: var(--padding-m);
    border-radius: 10px;
}

/* hoverover class for draging task */
.hoverover {
    border: 2px;
    border-color: aliceblue;
    border-style: dashed;
    scale: 1.05;
    transition: all 0.4s ease-in-out;
}

/* headings of each column */
section .taskcolumn .heading {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 5px;
}

/* for task */
section .taskcolumn .task {
    background-color: #000000;
    padding: var(--padding-m);
    border-radius: var(--border-radius-m);
    display: flex;
    flex-direction: column;
    gap: var(--padding-s);
    cursor: grab;
}

section .taskcolumn .task button {
    align-self: flex-end;
    cursor: pointer;
    padding: 12px 12px;
    border: none;
    border-radius: 13px;
    outline: none;
    background-color: var(--delete-color);
    color: white;
}
/* modal styling */
.modal {
    position: fixed;
    height: 100vh;
    width: 100vw;
    top: 0;
    left: 0;
    display: none;
    align-items: center;
    justify-content: center;
}
.modal.active{
    display: flex;
}
.modal .bg {
    position: absolute;
    height: 100%;
    width: 100%;
    backdrop-filter: blur(3px);
}

.modal .center {
    background-color: #1a1a1a;
    padding: 25px;
    border-radius: 15px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 10;
}

.modal .center input,
.modal .center textarea {
    border: 2px dashed yellow;
    outline: none;
    background-color: #1a1a1a;
    color: whitesmoke;
    padding: 15px;
    border-radius: 10px;
}

.modal .center button {
    background-color: aqua;
    border: none;
    outline: none;
    color: rebeccapurple;
    padding: 10px 12px;
    cursor: pointer;
    border-radius: 12px;
    width: fit-content;
    align-self: center;
}