/* Base Reset & Font */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Quicksand", sans-serif;
}

body {
  background: linear-gradient(135deg, #EEE6CA, #BBDCE5);
  min-height: 100vh;
  padding: 20px;
}

/* Layout Container */
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

/* To-Do Box */
.todo {
  width: 100%;
  max-width: 540px;
  background-color: #ECEEDF;
  margin: 60px auto 20px;
  padding: 40px 30px 70px;
  border-radius: 20px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

/* Header */
.todo h2 {
  color: #4e085f;
  font-size: 26px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
}

/* Input Row */
.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fff;
  border-radius: 30px;
  padding: 10px 20px;
  margin-bottom: 25px;
}

input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 16px;
  padding: 10px;
  color: #333;
  outline: none;
}

/* Add Button */
#addButton {
  border: none;
  outline: none;
  padding: 12px 20px;
  border-radius: 40px;
  background: #E5BEB5;
  color: #4e085f;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.3s ease;
}

#addButton:hover {
  background: #D9A9A0;
}

/* To-Do List */
ul {
  padding-left: 0;
}

ul li {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  border-radius: 22px;
  margin-bottom: 12px;
  padding: 12px 16px;
  font-size: 17px;
  transition: all 0.3s ease;
  animation: fadeIn 0.3s ease-in-out;
}

/* Custom Checkbox */
.custom-checkbox {
  position: relative;
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.custom-checkbox input {
  opacity: 0;
  width: 0;
  height: 0;
}

.checkmark {
  position: absolute;
  top: 0;
  left: 0;
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, #E5BEB5, #BBDCE5);
  border-radius: 50%;
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.1);
  transition: background 0.3s ease;
}

.custom-checkbox input:checked + .checkmark {
  background: linear-gradient(135deg, #BBDCE5, #E5BEB5);
}

.checkmark::after {
  content: "";
  position: absolute;
  display: none;
  left: 8px;
  top: 4px;
  width: 6px;
  height: 12px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.custom-checkbox input:checked + .checkmark::after {
  display: block;
}

/* Task Text */
.task-text {
  flex: 1;
  color: #333;
}

ul li.checked .task-text {
  color: #888;
  text-decoration: line-through;
}

/* Delete Icon */
.delete-icon {
  font-size: 18px;
  color: #888;
  cursor: pointer;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  border-radius: 50%;
  transition: background 0.3s ease, color 0.3s ease;
}

.delete-icon:hover {
  background-color: #BBDCE5;
  color: #4e085f;
}

.delete-icon:active {
  background-color: #E5BEB5;
  color: white;
}

/* Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */
@media (max-width: 480px) {
  .todo {
    margin: 30px auto;
    padding: 30px 20px 50px;
  }

  #addButton {
    padding: 10px 16px;
    font-size: 14px;
  }

  input {
    font-size: 14px;
  }

  ul li {
    font-size: 15px;
    padding: 10px 12px;
  }

  .checkmark {
    width: 20px;
    height: 20px;
  }

  .delete-icon {
    width: 24px;
    height: 24px;
    font-size: 16px;
  }
}