* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html,
body {
  height: 100%;
  width: 100%;
}
/* definign colors */
:root {
  /* color variables */
  --delete-color: #ff4d4d;
  --bg-button-color: #414141;
  --bg-task-color: #2c2c2c;
  --bg-color: #000000;
  --text-color: #ffffff;
  /* padding varaibles */
  --nav-padding: 15px 30px;
  --section-padding: 15px 30px;
  --padding-s: 5px;
  --padding-m: 10px;
  --padding-l: 20px;
  --padding-xl: 30px;
  --padding-xxl: 40px;
  /* border radious variables */
  --border-radius-s: 5px;
  --border-radius-m: 10px;
  --border-radius-l: 15px;
  --border-radius-xl: 20px;
  --border-radius-xxl: 25px;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
}

main {
  height: 100%;
  display: flex;
  flex-direction: column;
}
html {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

/* navigatin section */

nav {
  padding: var(--nav-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;

  background-color: var(--bg-color);
}
nav button {
  background-color: var(--bg-button-color);
  border: none;
  outline: none;
  color: var(--text-color);
  padding: var(--padding-m) var(--padding-l);
  cursor: pointer;
  border-radius: var(--border-radius-m);
}

/* the section which is called board */
section {
  padding: var(--section-padding);
  display: flex;
  justify-content: space-between;
  flex-grow: 1;
  gap: var(--padding-xxl);
}
section .task-column {
  flex-grow: 1;
  width: 100%;
  background-color: var(--bg-button-color);
  padding: var(--padding-m);
  display: flex;
  flex-direction: column;
  gap: var(--padding-m);
  border-radius: var(--border-radius-m);
  transition: all 0.7s cubic-bezier(0.19, 1, 0.22, 1);
}

.hover-over {
  border: 2px dashed var(--text-color);
  scale: 1.05;
}

section .task-column .heading {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

section .task-column .task {
  background-color: var(--bg-task-color);
  padding: var(--padding-m);
  border-radius: var(--border-radius-m);
  display: flex;
  flex-direction: column;
  gap: var(--padding-s);
  cursor: grab;
}
section .task-column .task button {
  align-self: flex-end;
  cursor: pointer;
  padding: var(--padding-s) var(--padding-m);
  border-radius: var(--border-radius-s);
  border: none;
  outline: none;
  background-color: var(--delete-color);
  color: var(--text-color);
}

/* modal for adding new task */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: 100vw;
  display: none;
  align-items: center;
  justify-content: center;
}
.modal.active {
  display: flex;
}
.modal .center {
  position: relative;
  background-color: var(--bg-button-color);
  padding: var(--padding-xxl);
  border-radius: var(--border-radius-m);
  display: flex;
  flex-direction: column;
  gap: var(--padding-m);
  z-index: 10;
}

.modal .center input,
.modal .center textarea,
.modal .center select {
  background-color: var(--bg-task-color);
  border: none;
  outline: none;
  color: var(--text-color);
  padding: var(--padding-m);
  border-radius: var(--border-radius-s);
  font-size: 1rem;
  resize: none;
}
.modal .center button {
  background-color: var(--delete-color);
  border: none;
  outline: none;
  color: var(--text-color);
  padding: var(--padding-m) var(--padding-l);
  cursor: pointer;
  border-radius: var(--border-radius-m);
  width: fit-content;
  align-self: center;
}
.modal .bg {
  position: absolute;
  height: 100%;
  width: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
}