style.css

@import url("https://fonts.googleapis.com/css2?family=Josefin+Sans:ital,wght@0,100..700;1,100..700&display=swap");

:root {
  --Bright-Blue: hsl(220, 98%, 61%);
  --Very-Dark-Blue: hsl(235, 21%, 11%);
  --Very-Dark-Desaturated-Blue: hsl(235, 24%, 19%);
  --Light-Grayish-Blue: hsl(234, 39%, 85%);
  --Light-Grayish-Blue-hover: hsl(236, 33%, 92%);
  --Dark-Grayish-Blue: hsl(234, 11%, 52%);
  --Very-Dark-Grayish-Blue: hsl(233, 14%, 35%);
  --Very-Dark-Grayish-Blue: hsl(237, 14%, 26%);
  --font-family: "Josefin Sans", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  background-color: var(--Very-Dark-Blue);
  position: relative;
  font-size: 16px;
}

.header-bg {
  background-image: url("./assets/bg-desktop-dark.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  height: 300px;
  width: 100%;
  position: absolute;
  top: 0;
  z-index: -1;
}

[data-color-scheme="dark"] .header-bg {
  background-image: url("assets/bg-desktop-light.jpg");
}

.wrapper {
  padding-top: 5rem;
  width: 95%;
  max-width: 500px;
  margin: 0 auto;
}
.container-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.container-header h3 {
  margin: 0;
  color: #fff;
  font-size: 2.5rem;
  font-weight: 700;
  text-transform: uppercase;
  font-family: inherit;
  letter-spacing: 1rem;
}
.container-header img {
  cursor: pointer;
  width: 25px;
  height: 25px;
}
.container {
  display: flex;
  flex-direction: column;
  border-radius: 5px;
}
.input-container {
  padding: 1rem;
  display: flex;
  align-items: center;
  column-gap: 0.75rem;
  background-color: var(--Very-Dark-Desaturated-Blue);
  margin-bottom: 1rem;
}
.input-container .input {
  background-color: var(--Very-Dark-Desaturated-Blue);
  color: var(--Light-Grayish-Blue);
  border: none;
  padding: 0.5rem;
  width: 100%;
  font-family: var(--font-family);
}
.input-container .input::placeholder {
  color: var(--Dark-Grayish-Blue);
}
.input-container .input:focus {
  outline: none;
}
.todo {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background-color: var(--Very-Dark-Desaturated-Blue);
  color: var(--Light-Grayish-Blue);
}
.todo-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.todo-text {
  margin: 0;
  font-size: 0.85rem;
}
.checkbox {
  position: relative;
  width: 25px;
  height: 25px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  overflow: hidden;
  border: 3px solid var(--Very-Dark-Grayish-Blue);
}
.checkbox img {
  display: none;
  width:auto;
  height: 9px;
}
.checkbox:hover {
  border: 3px solid var(--Light-Grayish-Blue-hover);
}
.active-todo {
  background: linear-gradient(
    to right,
    hsl(192, 100%, 67%),
    hsl(280, 87%, 65%)
  );
  background-repeat: no-repeat;
  border: none;
}
.active-todo:hover{
  border: none;
}
.active-todo img {
  display: block;
}
.active-todo + .todo-text {
  text-decoration: line-through;
  color: var(--Very-Dark-Grayish-Blue);
}

input[type="checkbox"] {
  position: absolute;
  z-index: -1;
  visibility: hidden;
}
.delete{
  cursor: pointer;
  height: 15px;
  width: 15px;
}
.todo-footer {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  color: var(--Dark-Grayish-Blue);
}
#listLenght{
  margin-right: 5px;
}
.todo-footer button {
  background-color: var(--Very-Dark-Desaturated-Blue);
  color: var(--Dark-Grayish-Blue);
  border: none;
  padding: 1rem;
  cursor: pointer;
  margin: 0;
  font-weight: 600;
}
.todo-footer p {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 1rem;
  font-size: 0.85rem;
  background-color: var(--Very-Dark-Desaturated-Blue);
}

.todo-footer .filter {
  flex-grow: 1;
  background-color: var(--Very-Dark-Desaturated-Blue);
  text-align: center;
}
.todo-footer .filter button{
  padding: 1rem .25rem;
}

.footer-active {
  color: var(--Bright-Blue) !important;
}
@media (max-width: 768px) {
  .todo-footer {
    flex-wrap: wrap;
  }
  .todo-footer p {
    order: 1;
    flex-basis: 50%;
    text-align: center;
  }
  .todo-footer button {
    order: 2;
    flex-basis: 50%;
  }
  .todo-footer .filter {
    order: 3;
    text-align: center;
    margin-top: 1rem;
  }
}