:root {
  --ff-sans: "Josefin Sans", sans-serif;
  --base-font: 1.6rem;
  --fw-normal: 400;
  --fw-bold: 700;
  --img-bg: url("../assets/images/bg-desktop-dark.jpg");
  --clr-primary: hsl(0, 0%, 98%);
  --clr-white: hsl(0, 0%, 100%);
  --clr-page-bg: hsl(235, 21%, 11%);
  --clr-card-bg: hsl(235, 24%, 19%);
  --clr-blue: hsl(220, 98%, 61%);
  --clr-green: hsl(192, 100%, 67%);
  --clr-pink: hsl(280, 87%, 65%);
  --clr-gb-1: hsl(236, 33%, 92%);
  --clr-gb-2: hsl(234, 39%, 75%);
  --clr-gb-3: hsl(234, 11%, 52%);
  --clr-gb-4: hsl(237, 12%, 36%);
  --clr-gb-5: hsl(233, 14%, 35%);
  --clr-gb-6: hsl(235, 19%, 24%);
  --clr-box-shadow: hsl(0, 0%, 0%, 0.1);
}

/* CHANGE CUSTOM PROPERTIES WHEN LIGHT THEME */

body.light {
  --img-bg: url("../assets/images/bg-desktop-light.jpg");
  --clr-primary: hsl(243, 12%, 30%);
  --clr-page-bg: hsl(0, 0%, 98%);
  --clr-card-bg: hsl(0, 0%, 100%);
  --clr-gb-1: hsl(240, 8%, 24%);
  --clr-gb-2: hsl(243, 12%, 30%);
  --clr-gb-3: hsl(252, 6%, 83%);
  --clr-gb-4: hsl(237, 10%, 64%);
  --clr-gb-5: hsl(252, 9%, 73%);
  --clr-gb-6: hsl(252, 21%, 94%);
}

/* RESETS */

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

html {
  font-size: 62.5%;
  position: relative;
}

html,
body {
  min-height: 100%;
}

ul {
  list-style: none;
}

img {
  user-select: none;
}

/* BODY */

body {
  font: var(--fw-normal) var(--base-font) var(--ff-sans);
  background: var(--clr-page-bg) var(--img-bg) no-repeat 0% 0% / 100vw 30rem;
  padding-top: 8rem;
  width: min(85%, 54rem);
  margin: auto;
}

/* INPUT AND BUTTON */

button {
  cursor: pointer;
}

input,
button {
  font: inherit;
  border: 0;
  background: transparent;
}

button {
  display: flex;
  user-select: none;
}

input:focus,
button:focus {
  outline: 0;
}

label {
  display: none;
}

/* ALL ARE CARDS  */

.card {
  background-color: var(--clr-card-bg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.9rem 2rem;
  gap: 2rem;
}

/* HEADER'S CARD */

header.card {
  background: transparent;
  padding: 0;
  align-items: flex-start;
}

header.card h1 {
  color: var(--clr-white);
  letter-spacing: 1.3rem;
  font-weight: 700;
  font-size: calc(var(--base-font) * 2);
}

/* CHECKBOX CONTAINER AND FIELD */

.card .cb-container {
  width: 2.5rem;
  height: 2.5rem;
  border: 0.1rem solid var(--clr-gb-5);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.card .cb-container .cb-input {
  transform: scale(1.8);
  opacity: 0;
}

.card .cb-container .check {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  pointer-events: none;
  border-radius: inherit;
}

/* CHECKED CARD */

.card .cb-container .cb-input:checked+.check {
  background: url("../assets/images/icon-check.svg"),
    linear-gradient(45deg, var(--clr-green), var(--clr-pink));
  background-repeat: no-repeat;
  background-position: center;
}

/* ADD CARD */

.add {
  margin: 4rem 0 2.5rem 0;
  border-radius: 0.5rem;
}

.add .cb-container {
  transition: background 0.3s ease;
}

.add .cb-container #add-btn {
  color: var(--clr-gb-2);
  font-size: var(--base-font);
  transition: color 0.3s ease;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
}

.add .cb-container:hover {
  background: var(--clr-blue);
}

.add .cb-container:active {
  transform: scale(0.95);
}

.add .cb-container:hover #add-btn {
  color: var(--clr-white);
}

.add .txt-container {
  flex: 1;
}

.add .txt-container .txt-input {
  width: 100%;
  padding: 0.7rem 0;
  color: var(--clr-gb-1);
}

body.light .add .txt-container .txt-input {
  font-weight: var(--fw-bold);
}

.add .txt-container .txt-input::placeholder {
  color: var(--clr-gb-5);
  font-weight: var(--fw-normal);
}

/* TODOS CONTAINER */

.todos>* {
  transition: 0.4s ease;
}

.todos .card[draggable] {
  cursor: move;
}

.todos .card:first-child {
  border-radius: 0.5rem 0.5rem 0 0;
}

.todos>*+* {
  border-top: 0.2rem solid var(--clr-gb-6);
}

.item-wrap {
  display: flex;
  justify-content: flex-start;
  flex: 1;
}

.item-input,
.item {
  flex: 1;
  color: var(--clr-gb-2);
  line-height: 1.5;
}

.item-input:hover,
.item:hover {
  color: var(--clr-gb-1);
}

.item-input,
.editing .item {
  display: none;
  visibility: hidden;
}

.editing .item-input {
  display: block;
  visibility: visible;
  color: var(--clr-gb-1);
}

body.light .todos {
  box-shadow: 0 0 2rem 0.4rem var(--clr-box-shadow);
}

/* COMPLETED ITEM */

.todos .card.checked .item {
  text-decoration: line-through;
  color: var(--clr-gb-3);
  text-decoration-color: var(--clr-gb-3);
}

/* CLEAR CONTAINER */

.clear {
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s ease;
}

.todos .card:hover .clear {
  opacity: 1;
  pointer-events: all;
}

/* STAT CONTAINER */

.stat {
  border-radius: 0 0 0.5rem 0.5rem;
  border-top: 0.2rem solid var(--clr-gb-6);
  font-size: calc(var(--base-font) - 0.3rem);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
}

.stat * {
  color: var(--clr-gb-4);
}

body.light .stat {
  box-shadow: 0 1rem 2rem -0.4rem var(--clr-box-shadow);
}

.hidden {
  display: none;
  visibility: hidden;
}

/* CORNERS */

.stat .corner:last-child {
  display: flex;
  justify-content: flex-end;
}

.stat .corner button:hover {
  color: var(--clr-primary);
}

/* FILTER BUTTONS */

.stat .filter {
  display: flex;
  justify-content: space-between;
  font-weight: var(--fw-bold);
}

.stat .filter *:hover {
  color: var(--clr-primary);
}

.stat .filter .on {
  color: var(--clr-blue);
}

/* FOOTER */

footer {
  margin: 4rem 0;
  text-align: center;
  color: var(--clr-gb-5);
}

/* JAVASCRIPT FUNCTIONS - STYLES */
/* FILTER TODOS */

.todos.active .card.checked,
.todos.completed .card {
  transition: 0.4s;
  opacity: 0;
  padding: 0;
  border: 0;
  height: 0;
  pointer-events: none;
}

.todos.completed .card.checked {
  opacity: 1;
  padding: 1.9rem 2rem;
  height: auto;
  display: flex;
  pointer-events: all;
  transition: 0.4s;
}

.todos.completed>.card.checked~.card.checked {
  border-top: 0.2rem solid var(--clr-gb-6);
}

/* FALL ANIMATION */
.todos .card.fall {
  pointer-events: none;
  animation: fall 0.2s forwards ease;
}

@keyframes fall {
  0% {
    opacity: 0.5;
    transform: translateX(20%);
  }

  50% {
    transform: translateX(25%) rotateZ(40deg);
    opacity: 0.3;
  }

  100% {
    transform: translateX(30%) rotateZ(90deg);
    opacity: 0;
  }
}

/* DRAG AND DROP */
.todos .card.dragging {
  opacity: 0.5;
}

@media (max-width: 599px) {
  .stat {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 5rem 2rem;
  }

  .stat .filter {
    grid-row: 2/3;
    grid-column: 1/3;
    justify-content: space-around;
    position: relative;
  }

  .stat .filter::before {
    content: "";
    position: absolute;
    width: calc(100% + 4rem);
    height: 1rem;
    background-color: var(--clr-page-bg);
    top: -3rem;
  }
}

@media (max-width: 340px) {
  header.card {
    align-items: center;
  }

  header.card h1 {
    font-size: calc(var(--base-font) * 1.5);
  }
}