:root {
    --primary-color: #3a0ca3;
    --primary-light: #4361ee;
    --primary-dark: #2f0582;
    --accent-color: #f72585;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-primary: #2d3436;
    --text-secondary: #636e72;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: "Poppins", sans-serif;
    background-color: var(--bg-color);
    background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
  }
  
  .container {
    width: 90%;
    max-width: 800px;
    background-color: var(--card-bg);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  }
  
  .header {
    text-align: center;
    margin-bottom: 2.5rem;
  }
  
  .task-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
  }
  
  h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
  }
  
  .subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 500;
  }
  
  .input-section {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
  }
  
  .input-wrapper {
    flex: 1;
    position: relative;
  }
  
  .input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
  }
  
  input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
  }
  
  input:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 4px rgba(67, 97, 238, 0.1);
  }
  
  .add-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
  }
  
  .add-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
  }
  
  .filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
  }
  
  .filter-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 10px;
    background-color: #f8f9fa;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }
  
  .filter-btn.active {
    background-color: var(--primary-color);
    color: white;
  }
  
  .filter-btn:hover:not(.active) {
    background-color: #e9ecef;
  }
  
  ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }
  
  li {
    background-color: #f8f9fa;
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
  }
  
  li:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  }
  
  .todo-content {
    flex: 1;
  }
  
  .todo-text {
    font-size: 1.1rem;
    color: var(--text-primary);
  }
  
  .todo-actions {
    display: flex;
    gap: 0.75rem;
  }
  
  .action-btn {
    padding: 0.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: white;
  }
  
  .complete-btn {
    background-color: #10b981;
  }
  
  .delete-btn {
    background-color: #ef4444;
  }
  
  .action-btn:hover {
    transform: translateY(-2px);
    filter: brightness(110%);
  }
  
  li.completed {
    background-color: #f1f5f9;
    opacity: 0.8;
  }
  
  li.completed .todo-text {
    text-decoration: line-through;
    color: #94a3b8;
  }
  
  @media (max-width: 768px) {
    .container {
      padding: 1.5rem;
    }
  
    .input-section {
      flex-direction: column;
    }
  
    .add-btn {
      width: 100%;
      justify-content: center;
    }
  
    .filters {
      flex-wrap: wrap;
    }
  
    .filter-btn {
      flex: 1;
      justify-content: center;
    }
  }