* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  min-height: 100vh;
  background-color: #0a0a0a;
  color: #e0e0e0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem;
}

.header {
  text-align: center;
  margin-bottom: 2rem;
}

.header h1 {
  font-size: 2.5rem;
  font-weight: 600;
  color: #ffffff;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.main {
  width: 100%;
  max-width: 600px;
  background-color: #131313;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.add-input-container,
.search-input-container {
  display: flex;
  margin-bottom: 1.5rem;
  position: relative;
}

.add-todo-input,
.search-todo-input {
  flex: 1;
  padding: 0.8rem 1rem;
  border: none;
  border-radius: 8px;
  background-color: #1e1e1e;
  color: #ffffff;
  font-size: 1rem;
  outline: none;
  transition: all 0.3s ease;
}

.add-todo-input:focus,
.search-todo-input:focus {
  box-shadow: 0 0 0 2px #3a3a3a;
}

.add-todo-btn {
  width: 46px;
  height: 46px;
  margin-left: 0.5rem;
  border: none;
  border-radius: 8px;
  background-color: #4a6fa5;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.add-todo-btn:hover {
  background-color: #5a80b5;
}

.add-todo-btn::before,
.add-todo-btn::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: white;
}

.add-todo-btn::before {
  width: 16px;
  height: 2px;
}

.add-todo-btn::after {
  width: 2px;
  height: 16px;
}

.todo-list-container {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.todo {
  display: flex;
  align-items: center;
  padding: 0.8rem 1rem;
  background-color: #1e1e1e;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.todo:hover {
  background-color: #252525;
}

.todo-checkbox {
  width: 18px;
  height: 18px;
  margin-right: 1rem;
  cursor: pointer;
  accent-color: #4a6fa5;
}

.todo-info {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.todo-text {
  font-size: 1rem;
  margin-bottom: 0.2rem;
  word-break: break-word;
}

.todo-created-date {
  font-size: 0.75rem;
  color: #8a8a8a;
}

.remove-todo-btn {
  border: none;
  background-color: transparent;
  border-radius: 10px;
  color: #8a8a8a;
  font-size: 24px;
  width: 50px;
  height: 50px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.remove-todo-btn:hover {
  background-color: #333333;
  color: #ff5a5a;
}

.todo:has(.todo-checkbox:checked) .todo-text {
  text-decoration: line-through;
  color: #8a8a8a;
}

@media (max-width: 640px) {
  body {
    padding: 1rem;
  }

  .main {
    padding: 1.5rem;
  }

  .header h1 {
    font-size: 2rem;
  }
}