@import url("https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&family=Josefin+Sans:ital,wght@0,100..700;1,100..700&display=swap");

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

:root {
  --blue-500: hsl(220, 98%, 61%);
  --check-bg-start: hsl(192, 100%, 67%);
  --check-bg-end: hsl(280, 87%, 65%);

  --light-gray-50: hsl(0, 0%, 98%);
  --light-purple-300: hsl(234, 39%, 85%);
  --light-gray-300: hsl(233, 11%, 84%);
  --light-gray-600: hsl(236, 9%, 61%);
  --light-navy-850: hsl(235, 19%, 35%);

  --dark-navy-950: hsl(235, 21%, 11%);
  --dark-navy-900: hsl(235, 24%, 19%);
  --dark-purple-300: hsl(234, 39%, 85%);
  --dark-purple-100: hsl(236, 33%, 92%);
  --dark-purple-600: hsl(235, 16%, 43%);
  --dark-purple-700: hsl(233, 14%, 35%);
  --dark-purple-800: hsl(237, 14%, 26%);
  --dark-gray-600: hsl(236, 9%, 61%);

  --font-family: "Josefin Sans", sans-serif;

  --checkbox-size: 2rem;
  --checkbox-icon-scale: 0.45;
  --checkbox-gap: 1rem;

  --checkbox-padding: 0.125rem;
  --hero-height: 18rem;
  --hero-overlap: 10rem;
}

body {
  background-color: var(--dark-navy-950);
  font-family: var(--font-family);
  color: var(--light-gray-50);
}

.light body {
  background-color: var(--light-gray-300);
  color: var(--light-navy-850);
}


.bg-img {
  width: 100%;
  height: var(--hero-height);
  object-fit: cover;
  display: block;
}

.bg {
  height: var(--hero-height);
  overflow: hidden;
  position: relative;
}

.app-title {
  font-size: 2.5rem;
  letter-spacing: 0.5rem;
  color: var(--light-gray-50);
  text-transform: uppercase;
}

main {
  width: min(100%, 31.25rem);
  margin: calc(-1 * var(--hero-overlap)) auto 0;
  padding: 1rem;
  position: relative;
  z-index: 10;
}

.app-header {
  display: flex;

  justify-content: space-between;
  margin: 1rem 0;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  color: var(--dark-gray-600);
}

.theme-toggle {
  margin-left: 1rem;
}

.todo-create {
  display: flex;
  align-items: center;
  width: 100%;

  padding: 1rem;
  gap: 1rem;
  width: 100%;

  background-color: var(--dark-navy-900);
  border-radius: 0.5rem;
  margin: 1rem 0;
}

.light .todo-create, .light .tasks-container {
  background-color: var(--light-gray-50);
}

.todo-create__input {
  flex: 1 1 0;
  min-width: 0;
  width: 100%;
  background: transparent;
  border: none;
  color: var(--light-gray-50);
  padding: 0.5rem;
  font-family: var(--font-family);
  font-size: 1rem;

  background: none;
  border: none;
  width: 100%;

  font-family: var(--font-family);
  font-size: 1rem;
  color: var(--dark-purple-100);

  outline: none;
}

.light .todo-create__input {
  color: var(--dark-purple-700);
}

.todo-checkbox {
  display: inline-flex;
  align-items: center;
  gap: var(--checkbox-gap);
  cursor: pointer;
  padding: var(--checkbox-padding);
}

.todo-checkbox__input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.todo-checkbox__box {
  width: var(--checkbox-size);
  height: var(--checkbox-size);
  border-radius: 50%;
  background: var(--dark-navy-900);
  border: 1px solid rgba(255, 255, 255, 0.06);
  display: inline-grid;
  place-items: center;
  transition:
    background 0.18s ease,
    box-shadow 0.18s ease,
    transform 0.12s ease;
}

.light .todo-checkbox__box {
  background: var(--light-gray-50);
  border: 2px solid rgba(0, 0, 0, 0.06);
}

.todo-checkbox__box::after {
  content: "";
  width: calc(var(--checkbox-size) * var(--checkbox-icon-scale));
  height: calc(var(--checkbox-size) * var(--checkbox-icon-scale));
  background-image: url("../../assets/icon-check.svg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: calc(var(--checkbox-size) * var(--checkbox-icon-scale));
  opacity: 0;
  transform: scale(0.8);
  transition:
    opacity 0.18s ease,
    transform 0.18s ease;
}

.todo-checkbox__input:checked + .todo-checkbox__box {
  background: linear-gradient(
    135deg,
    var(--check-bg-start),
    var(--check-bg-end)
  );
  border: none;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.todo-checkbox__input:checked + .todo-checkbox__box::after {
  opacity: 1;
  transform: scale(1);
}

.todo-checkbox__input:focus + .todo-checkbox__box {
  outline: 3px solid var(--dark-purple-100);
  outline-offset: 3px;
}

.todo-checkbox__label {
  color: var(--dark-purple-300);
  font-size: 1rem;
  user-select: none;
}

.todo-checkbox__label {
  flex: 1 1 auto;
  min-width: 0; 
  overflow-wrap: break-word;
  white-space: pre-wrap;
  word-break: break-word;
}

.light .todo-checkbox__label {
  color: var(--dark-purple-700);
}

.tasks-container {
  background-color: var(--dark-navy-900);
  border-radius: 0.5rem;

  margin: 1rem 0;
}

.task-container {
  border-bottom: 1px solid var(--dark-purple-600);
  padding: 0.5rem;
  margin: 0.5rem 0;
}

.hidden {
  display: none;
}

.completed .todo-checkbox__label {
  text-decoration: line-through;
  opacity: 0.6;
}

.light .task-container {
  border-bottom: 1px solid var(--light-purple-300);
}

.todo-checkbox {
  display: flex;
  gap: var(--checkbox-gap);
  cursor: pointer;
}

.todo-footer {
  display: flex;
  justify-content: space-between;

  padding: 0.5rem;
}

.todo-count {
  color: var(--dark-gray-600);
  font-size: 0.75rem;
}

.filters {
  background-color: var(--dark-navy-900);
  padding: 1rem;
  
}

.light .filters {
  background-color: var(--light-gray-50);
}

ul.filters__list {
  display: flex;
  list-style: none;
  justify-content: center;
  gap: 1rem;
}

.filters__btn {
  font-weight: 700;
}

.clear-completed:hover {
  color: var(--dark-purple-100);
}

.filters__btn:hover {
  color: var(--dark-purple-100);
}

.light .clear-completed:hover,
.light .filters__btn:hover {
  color: var(--light-navy-850-700);
}

.filters__btn--active,
.filters__btn--active:hover {
  color: var(--blue-500);
}