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

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      min-height: 100vh;
      padding: 10px;
      color: #333;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .container {
      max-width: 500px;
      margin: 0 auto;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      animation: slideUp 0.5s ease-out;
    }

    @keyframes slideUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .header {
      background: linear-gradient(135deg, #667eea, #764ba2);
      padding: 25px 20px;
      text-align: center;
      color: white;
      position: relative;
    }

    .header h1 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 5px;
    }

    .stats {
      display: flex;
      justify-content: center;
      gap: 15px;
      font-size: 12px;
      opacity: 0.9;
    }

    .stat {
      display: flex;
      align-items: center;
      gap: 5px;
    }

    .input-section {
      padding: 20px;
      border-bottom: 1px solid #f0f0f0;
    }

    .input-wrapper {
      display: flex;
      gap: 10px;
      margin-bottom: 15px;
    }

    #task-input {
      flex: 1;
      padding: 15px;
      border: 2px solid #e9ecef;
      border-radius: 12px;
      font-size: 16px;
      transition: all 0.3s ease;
      background: #f8f9fa;
    }

    #task-input:focus {
      outline: none;
      border-color: #667eea;
      background: white;
      box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    }

    #add-task-btn {
      padding: 15px 20px;
      background: linear-gradient(135deg, #667eea, #764ba2);
      color: white;
      border: none;
      border-radius: 12px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s ease;
      min-width: 60px;
    }

    #add-task-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
    }

    #add-task-btn:active {
      transform: translateY(0);
    }

    .filters {
      display: flex;
      gap: 5px;
      margin-bottom: 10px;
    }

    .filter-btn {
      padding: 8px 15px;
      border: 1px solid #e9ecef;
      background: white;
      border-radius: 20px;
      font-size: 14px;
      cursor: pointer;
      transition: all 0.3s ease;
      color: #666;
    }

    .filter-btn.active {
      background: #667eea;
      color: white;
      border-color: #667eea;
    }

    .task-section {
      padding: 0 20px 20px;
    }

    .section-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 15px;
      padding-top: 10px;
    }

    .section-title {
      font-size: 18px;
      font-weight: 600;
      color: #333;
    }

    .clear-completed {
      padding: 6px 12px;
      background: #ff6b6b;
      color: white;
      border: none;
      border-radius: 15px;
      font-size: 12px;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .clear-completed:hover {
      background: #ff5252;
      transform: scale(1.05);
    }

    .task-list {
      list-style: none;
      max-height: 400px;
      overflow-y: auto;
    }

    .task-item {
      background: white;
      margin-bottom: 10px;
      border-radius: 12px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
      transition: all 0.3s ease;
      border: 2px solid transparent;
      position: relative;
      overflow: hidden;
    }

    .task-item:hover {
      box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
      transform: translateY(-2px);
    }

    .task-item.completed {
      opacity: 0.7;
      background: #f8f9fa;
    }

    .task-content {
      display: flex;
      align-items: center;
      padding: 15px;
      gap: 12px;
    }

    .task-checkbox {
      width: 20px;
      height: 20px;
      border: 2px solid #ddd;
      border-radius: 50%;
      cursor: pointer;
      position: relative;
      transition: all 0.3s ease;
      flex-shrink: 0;
    }

    .task-checkbox.checked {
      background: #4caf50;
      border-color: #4caf50;
    }

    .task-checkbox.checked::after {
      content: '✓';
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      color: white;
      font-size: 12px;
      font-weight: bold;
    }

    .task-text {
      flex: 1;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.3s ease;
      word-break: break-word;
      line-height: 1.4;
    }

    .task-text.completed {
      text-decoration: line-through;
      color: #999;
    }

    .task-actions {
      display: flex;
      gap: 8px;
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .task-item:hover .task-actions {
      opacity: 1;
    }

    .action-btn {
      width: 32px;
      height: 32px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      transition: all 0.3s ease;
    }

    .edit-btn {
      background: #ffc107;
      color: white;
    }

    .edit-btn:hover {
      background: #ffb300;
      transform: scale(1.1);
    }

    .delete-btn {
      background: #ff6b6b;
      color: white;
    }

    .delete-btn:hover {
      background: #ff5252;
      transform: scale(1.1);
    }

    .edit-input {
      flex: 1;
      padding: 10px;
      border: 2px solid #667eea;
      border-radius: 8px;
      font-size: 16px;
      background: white;
    }

    .empty-state {
      text-align: center;
      padding: 40px 20px;
      color: #999;
    }

    .empty-state-icon {
      font-size: 48px;
      margin-bottom: 15px;
      opacity: 0.5;
    }

    .priority-indicator {
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 4px;
      background: #667eea;
    }

    .priority-high {
      background: #ff6b6b !important;
    }

    .priority-medium {
      background: #ffc107 !important;
    }

    .priority-low {
      background: #4caf50 !important;
    }

    .priority-selector {
      margin-left: 10px;
      padding: 8px;
      border: 1px solid #e9ecef;
      border-radius: 8px;
      background: white;
      font-size: 14px;
    }

    /* Mobile Responsiveness */
    @media (max-width: 480px) {
      body {
        padding: 5px;
      }

      .container {
        border-radius: 15px;
      }

      .header {
        padding: 20px 15px;
      }

      .header h1 {
        font-size: 20px;
      }

      .input-section {
        padding: 15px;
      }

      .input-wrapper {
        flex-direction: column;
        gap: 10px;
      }

      #add-task-btn {
        width: 100%;
        padding: 15px;
      }

      .filters {
        flex-wrap: wrap;
      }

      .filter-btn {
        flex: 1;
        min-width: 70px;
        text-align: center;
      }

      .task-section {
        padding: 0 15px 15px;
      }

      .task-content {
        padding: 12px;
      }

      .task-text {
        font-size: 15px;
      }

      .stats {
        flex-direction: column;
        gap: 5px;
      }
    }

    @media (max-width: 320px) {
      .header h1 {
        font-size: 18px;
      }

      .task-content {
        padding: 10px;
        gap: 10px;
      }

      .task-text {
        font-size: 14px;
      }

      .action-btn {
        width: 28px;
        height: 28px;
        font-size: 12px;
      }

      .filter-btn {
        padding: 6px 10px;
        font-size: 12px;
      }
    }

    /* Dark Mode Styles */
    body.dark-theme {
      background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
      color: #e0e0e0;
    }

    body.dark-theme .container {
      background: rgba(30, 30, 30, 0.95);
      color: #e0e0e0;
    }

    body.dark-theme .header {
      background: linear-gradient(135deg, #2d3748, #4a5568);
    }

    body.dark-theme #task-input {
      background: #2d3748;
      border-color: #4a5568;
      color: #e0e0e0;
    }

    body.dark-theme #task-input:focus {
      background: #4a5568;
      border-color: #667eea;
    }

    body.dark-theme .filter-btn {
      background: #2d3748;
      border-color: #4a5568;
      color: #e0e0e0;
    }

    body.dark-theme .filter-btn.active {
      background: #667eea;
      color: white;
    }

    body.dark-theme .task-item {
      background: #2d3748;
      color: #e0e0e0;
    }

    body.dark-theme .task-item:hover {
      background: #4a5568;
    }

    body.dark-theme .task-item.completed {
      background: #1a202c;
    }

    body.dark-theme .task-checkbox {
      border-color: #4a5568;
    }

    body.dark-theme .edit-input {
      background: #4a5568;
      border-color: #667eea;
      color: #e0e0e0;
    }

    body.dark-theme .priority-selector {
      background: #2d3748;
      border-color: #4a5568;
      color: #e0e0e0;
    }

    body.dark-theme .section-title {
      color: #e0e0e0;
    }

    body.dark-theme .empty-state {
      color: #a0a0a0;
    }

    /* Dark mode toggle */
    .theme-toggle {
      position: absolute;
      top: 20px;
      right: 20px;
      background: rgba(255, 255, 255, 0.2);
      border: none;
      color: white;
      padding: 8px;
      border-radius: 50%;
      cursor: pointer;
      font-size: 16px;
      transition: all 0.3s ease;
    }

    .theme-toggle:hover {
      background: rgba(255, 255, 255, 0.3);
      transform: rotate(180deg);
    }

    /* Animation for new tasks */
    @keyframes taskAppear {
      from {
        opacity: 0;
        transform: translateX(-100%);
      }
      to {
        opacity: 1;
        transform: translateX(0);
      }
    }

    .task-item.new {
      animation: taskAppear 0.5s ease-out;
    }