:root {
  --background: #101114;
  --primary-color: #1C1D20;
  --secondary-color: #4A4D57;
  --accent-color: #00FFC4;
  --text-color: #F9F9F9;
}

*{
   margin: 0;
   padding: 0;
}

html {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 16pt;
  color: var(--text-color);
}

body {
  min-height: 100vh;
  padding: 10px;
  background-color: var(--background);
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  margin-top: 100px;
  margin-bottom: 20px;
  font-size: 3rem;
  font-weight: 800;
  text-transform: uppercase;
  text-align: center;
  color: var(--accent-color);
}

.wrapper {
  width: 700px;
  max-width: 100%;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#todo-input {
  box-sizing: border-box;
  padding: 12px 20px;
  width: 100%;
  background: none;
  border: 2px solid var(--secondary-color);
  border-radius: 1000px;
  font: inherit;
  color: var(--text-color);
  caret-color: var(--accent-color);
}

#todo-input:focus{
   outline: none;
}

form{
   position: relative;
}
#add-btn{
   position: absolute;
   top:0;
   right: 0;
   background-color: var(--accent-color);
   height: 100%;
   padding: 0 30px;
   border: none;
   border-radius: 1000px;
   font: inherit;
   font-weight: 600;
   color: var(--background);
   cursor: pointer;
}

.todo {
  margin-bottom: 10px;
  padding: 0 16px;
  background-color: var(--primary-color);
  border-radius: 15px;
  display: flex;
  align-items: center;
}

.todo .todo-text{
   padding : 15px;
   padding-right: 0;
   flex-grow: 1;
   transition: 200ms ease;
}

.del-btn {
  padding: 3px;
  background: none;
  border: none;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
}

.del-btn svg{
   transition: 200ms ease;
}

.del-btn:hover svg{
   fill: #ff0033;
}

.custom-checkbox{
   border: 2px solid var(--accent-color);
   border-radius: 50%;
   min-height: 20px;
   min-width: 20px;
   display: flex;
   justify-content: center;
   align-items: center;
   flex-shrink: 0;
   transition: 200ms ease;
   cursor: pointer;
}

input[type="checkbox"]:checked ~ .custom-checkbox{
   background-color: var(--accent-color);
}

input[type="checkbox"]:checked ~ .custom-checkbox svg{
   fill: var(--primary-color);
}

input[type="checkbox"]:checked ~ .todo-text{
   text-decoration: line-through;
   color: var(--secondary-color);
}

input[type="checkbox"]{
   display: none;
}