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

:root {
    --content-width: 400px;
  
    /* Base colors */
    --color-white: #ffffff;
    --color-light-blue: #bde9f0;
    --color-text: #4a5568;
  
    /* Accent colors */
    --color-accent: #ff9a8b;     /* Add Task */
    --color-accent-hover: #ff7f73;
  
    --color-success: #a3f7bf;    /* Check/Uncheck */
    --color-success-text: #2f855a;
  
    --color-edit: #4a5568;      
    --color-delete: #e53e3e;   
    --color-delete-hover: #c53030;
  
    --color-bg-light: #f7fafa;
  }
  
  body {
    background-color: var(--color-white);
    color: var(--color-text);
    font-family: Arial, sans-serif;
  }
  
  .main-container {
    width: calc(var(--content-width) + 30px);
    padding: 20px;
    margin: 100px auto;
    background-color: var(--color-bg-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    border-radius: 20px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
  }
  
  .title-container {
    background-color: var(--color-light-blue);
    width: var(--content-width);
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
    padding: 12px;
    border-radius: 15px;
    font-size: 24px;
    font-weight: bold;
  }
  
  .input-container {
    display: flex;
    justify-content: center;
    width: var(--content-width);
    margin-bottom: 20px;
  }
  
  .input-box {
    flex-grow: 1;
    display: flex;
    align-items: center;
    border: 1px solid var(--color-light-blue);
    border-radius: 20px;
    padding: 5px 10px;
    background-color: #fff;
  }
  
  .input {
    flex-grow: 1;
    border: none;
    outline: none;
    background: transparent;
    font-size: 14px;
  }
  
  button.add-button {
    background-color: var(--color-accent);
    color: white;
    border: none;
    margin-left: 10px;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  button.add-button:hover {
    background-color: var(--color-accent-hover);
  }
  
  .lists {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: var(--content-width);
  }
  
  .list-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 8px 12px;
    background-color: var(--color-light-blue);
    border-radius: 10px;
    list-style: none;
    box-sizing: border-box;
  }
  
  .list-row button {
    border: none;
    background: none;
    cursor: pointer;
    font-size: 18px;
  }
  
  button.checked {
    background-color: var(--color-success);
    color: var(--color-success-text);
    border-radius: 50%;
    padding: 4px;
  }
  
  button.delete-button {
    color: var(--color-delete);
  }
  
  button.delete-button:hover {
    color: var(--color-delete-hover);
  }
  
  button.edit-button {
    color: var(--color-edit);
  }
  
  .list-row span {
    flex: 1;
    margin: 0 12px;
    font-size: 16px;
  }
  
  .list-row span.checked {
    text-decoration: line-through;
    color: var(--color-success-text);
  }
  
  .list-row span.editing {
    background-color: var(--color-light-blue);
    border-radius: 10px;
    padding: 2px 5px;
  }
  
  .list-row span.editing input {
    width: 100%;
    border: none;
    outline: none;
    background: transparent;
  }
  
  .list-row span.editing input:focus {
    background-color: var(--color-light-blue);
    border-radius: 10px;
  }
  
  .list-row span.editing input:focus-visible {
    outline: 2px solid var(--color-light-blue);
  }