:root {
    --bg-color: #121212;
    --text-color: #f5f5f5;
    --card-bg: #1e1e1e;
    --accent: #00bfff;
    --accent-green: #00e676;
    --btn-color: #00bfff;
    --btn-danger: #ff4444;
    }
    
    body.light {
    --bg-color: #f5f5f5;
    --text-color: #121212;
    --card-bg: #ffffff;
    --accent: #6200ee;
    --accent-green: #008744;
    --btn-color: #6200ee;
    --btn-danger: #d00000;
    }
    
    * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    }
    
    body {
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 20px;
    transition: all 0.3s;
    }
    
    .hidden {
    display: none;
    }
    
    #loginScreen {
    max-width: 400px;
    margin: 100px auto;
    text-align: center;
    }
    
    #loginScreen input {
    width: 100%;
    padding: 12px;
    margin: 20px 0;
    border: none;
    border-radius: 6px;
    }
    
    #loginScreen button {
    background: var(--btn-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    cursor: pointer;
    }
    
    header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    }
    
    header button {
    background: var(--btn-color);
    color: white;
    border: none;
    padding: 8px 12px;
    margin-left: 10px;
    border-radius: 4px;
    cursor: pointer;
    }
    button {
        padding: 10px 20px;
        background-color: #007bff;
        color: white;
        border: none;
        border-radius: 5px;
        cursor: pointer;
      }
      
      button:hover {
        background-color: #0056b3;
      }
    
    .dashboard {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    }
    
    .card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    flex: 1;
    }
    
    .total {
    border-left: 5px solid var(--accent);
    }
    
    .done {
    border-left: 5px solid var(--accent-green);
    }
    
    .task-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    }
    
    #taskInput {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 4px;
    }
    
    #addTaskBtn {
    background-color: var(--btn-color);
    border: none;
    color: white;
    padding: 10px 14px;
    border-radius: 4px;
    cursor: pointer;
    }
    
    .task-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    }
    
    .task-item {
    background: var(--card-bg);
    padding: 14px;
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    }
    
    .task-item.done {
    text-decoration: line-through;
    opacity: 0.7;
    }
    
    .task-buttons button {
    margin-left: 8px;
    background: #333;
    color: white;
    border: none;
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
    }