:root {
  --bg: #f2f2f2;
  --items-text: #393a4b;
  --items-bg: #ffffff;
  --completed-text: #e3e4f1;
  --active-text: #3a7cfd;
  --placeholder-text: #9495a5;
  --border-color: #979797;
  --text-color-footer: #9495a5;
  --items-left: #9495a5;
  --checkbox-gradient: linear-gradient(to bottom right, #55ddff, #c058f3);
  --shadow-color: rgba(0, 0, 0, 0.15);
  --header-bg-desktop: url("./images/bg-desktop-light.jpg");
  --header-bg-mobile: url("./images/bg-mobile-light.jpg");
}

/* DARK MODE */
.dark-mode {
  --bg: #25273d;
  --items-text: #c8cbe7;
  --items-bg: #25273d;
  --completed-text: #4d5067;
  --placeholder-text: #9495a5;
  --border-color: #393a4b;
  --text-color-footer: #9495a5;
  --shadow-color: rgba(0, 0, 0, 0.5);
  --header-bg-desktop: url("./images/bg-desktop-dark.jpg");
  --header-bg-mobile: url("./images/bg-mobile-dark.jpg");
}

/*GLOBAL STYLES */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 18px;
}

body {
  font-family: "Josefin Sans", sans-serif;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background-color: var(--bg);
  color: var(--items-text);
  transition: background-color 0.3s ease;
}

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

/*HEADER STYLES*/

.header {
  width: 100%;
  height: 300px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transition: background-image 0.3s ease;
  background-image: var(--header-bg-mobile);
}

@media (min-width: 1440px) {
  .header {
    background-image: var(--header-bg-desktop);
    padding-top: 70px;
  }
}

.wrapper {
  max-width: 540px;
  margin: 0 auto;
  padding: 0 20px;
}

.header-background {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding-top: 48px;
}

.header-line {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 48px;
}

.header-text {
  color: white;
  text-transform: uppercase;
  letter-spacing: 15px;
  font-size: 2rem;
  font-weight: 700;
  margin: 0;
}

.header-icon {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header-icon img {
  width: 26px;
  height: 26px;
}

/* MAIN CONTENT */

#main {
  margin-top: -150px;
  padding-bottom: 50px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.todolist-container {
  box-shadow: 0 25px 50px -12px var(--shadow-color);
  border-radius: 5px;
  overflow: hidden;
}

.todo-input-group {
  display: flex;
  align-items: center;
  background-color: var(--items-bg);
  border-radius: 5px 5px 0 0;
  padding: 20px 24px;
}

.new-input {
  flex-grow: 1;
  border: none;
  background-color: transparent;
  outline: none;
  font-size: 1rem;
  font-family: "Josefin Sans", sans-serif;
  color: var(--items-text);
  padding-left: 20px;
}

.new-input::placeholder {
  color: var(--placeholder-text);
}

.new-input:focus {
  outline: 1px solid var(--active-text);
}

/*CHECKBOX STYLING */

.todo-checkbox,
.new-checkbox {
  appearance: none;
  -webkit-appearance: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  cursor: pointer;
  flex-shrink: 0;
  position: relative;
  background: var(--items-bg);
}

.new-checkbox {
  cursor: default;
  pointer-events: none;
  opacity: 0.3;
}

/* Checked Checkbox */

.todo-checkbox:checked {
  background: var(--checkbox-gradient);
  border: none;
}

.todo-checkbox:checked::before {
  content: url("./images/icon-check.svg");
  display: flex;
  align-items: center;
  justify-content: center;
  width: 12px;
  height: 12px;
}

/* Unchecked Checkbox */
.todo-checkbox:hover:not(:checked) {
  border: 2px solid transparent;
  background: linear-gradient(var(--items-bg), var(--items-bg)) padding-box,
    var(--checkbox-gradient) border-box;
}
.todo-checkbox:hover:not(:checked)::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  bottom: -1px;
  background: var(--checkbox-gradient);
  border-radius: 50%;
  z-index: -1;
  padding: 1px;
}

.todo-checkbox:hover:not(:checked)::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--items-bg);
  border-radius: 50%;
  z-index: 0;
}

/*TO DO LIST ITEMS*/

.todo-list {
  list-style: none;
  padding: 0;
  margin: 0;
  background-color: var(--items-bg);
}

.todo-item,
.todo-item-completed {
  display: flex;
  align-items: center;
  padding: 20px 40px;

  border-bottom: 1px solid var(--border-color);
  position: relative;
  background-color: var(--items-bg);
}

.todo-item:first-child,
.todo-item-completed:first-child {
  border-top: none;
}

.todo-text {
  flex-grow: 1;
  margin-left: 24px;
  cursor: pointer;
  color: var(--items-text);
  word-break: break-word;
}

.completed .todo-text {
  text-decoration: line-through;
  color: var(--completed-text);
}

/*DELETE BUTTON*/

.delete-todo {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  opacity: 0;
  transition: opacity 0.3s ease;
  margin-left: auto;
}

.todo-item:hover .delete-todo,
.todo-item-completed:hover .delete-todo {
  opacity: 1;
}

.delete-todo img {
  width: 18px;
  height: 18px;
}

/*Todo FOOTER*/

.todolist-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background-color: var(--items-bg);
  border-radius: 0 0 5px 5px;
  font-size: 0.8rem;
  color: var(--text-color-footer);
}

.items-left {
  flex-grow: 1;
}

.filters {
  display: flex;
  gap: 15px;
}

.filter-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-color-footer);
  font-family: "Josefin Sans", sans-serif;
  font-weight: 700;
  padding: 0;
  transition: color 0.3s ease;
}

.filter-btn:hover {
  color: var(--items-text);
}

.filter-btn.active {
  color: var(--active-text);
}

.clear-completed-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-color-footer);
  font-family: "Josefin Sans", sans-serif;
  transition: color 0.2s ease;
}

.clear-completed-btn:hover {
  color: var(--items-text);
}

/*DRAG AND DROP*/

.drag-reorder {
  text-align: center;
  color: var(--text-color-footer);
  font-size: 0.9rem;
  margin-top: 50px;
}

.attribution {
  text-align: center;
  color: var(--text-color-footer);
  font-size: 0.7rem;
  margin-top: 20px;
}

.attribution a {
  color: var(--active-text);
  text-decoration: none;
}

.hidden {
  display: none !important;
}

/* FOR MOBILE */
@media (max-width: 768px) {
  .todolist-footer {
    flex-direction: column;
    gap: 15px;
    padding: 15px 24px;
  }

  .todolist-footer > div:first-child {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .filters {
    order: 2;
    width: 100%;
    justify-content: center;
    background-color: var(--items-bg);
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 25px 50px -12px var(--shadow-color);
    margin-top: 15px;
  }
}