* { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: 'Segoe UI', sans-serif;
      background: url('https://images.unsplash.com/photo-1516901123443-9cbbdb3fd1c8?fit=crop&w=1400&q=80') no-repeat center center fixed;
      background-size: cover;
      height: 100vh;
      display: flex;
      flex-direction: column;
    }
    header {
      text-align: center;
      padding: 20px;
      background: #f5f5f5;
      font-size: 24px;
      font-weight: bold;
      color: #333;
      box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }
    .container {
      display: flex;
      flex: 1;
      padding: 40px;
      gap: 40px;
    }
    .left-panel {
      background: #fff;
      padding: 25px;
      width: 350px;
      border-radius: 6px;
      box-shadow: 0 3px 10px rgba(0,0,0,0.1);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .left-panel input, .left-panel textarea {
      width: 100%;
      padding: 10px;
      margin-bottom: 20px;
      font-size: 16px;
      border-radius: 5px;
      border: 1px solid #ccc;
    }
    .left-panel button {
      padding: 12px;
      background: #28a745;
      color: white;
      border: none;
      border-radius: 5px;
      font-size: 16px;
      cursor: pointer;
    }
    .right-panel {
      flex: 1;
      background: rgba(255,255,255,0.9);
      padding: 25px;
      border-radius: 6px;
      box-shadow: 0 3px 10px rgba(0,0,0,0.1);
    }
    .tabs {
      display: flex;
      gap: 20px;
      margin-bottom: 20px;
    }
    .tab {
      padding: 10px 20px;
      background: #e0e0e0;
      border-radius: 5px;
      cursor: pointer;
    }
    .tab.active {
      background: #007bff;
      color: white;
    }
    .task-header {
      display: grid;
      grid-template-columns: 1fr 1fr 80px;
      font-weight: bold;
      margin-bottom: 10px;
      border-bottom: 1px solid #ccc;
      padding-bottom: 10px;
    }
    .task-list .task {
      display: grid;
      grid-template-columns: 1fr 1fr 80px;
      background: #fff;
      margin-bottom: 10px;
      border-radius: 5px;
      padding: 12px;
      align-items: center;
      box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    }
    .task.complete {
      background: #e9fbe9;
    }
    .task button {
      border: none;
      background: #dc3545;
      color: white;
      padding: 6px 10px;
      font-size: 14px;
      border-radius: 4px;
      cursor: pointer;
      margin-left: 4px;
    }
    .task .edit {
      background: #ffc107;
    }
    .task .done {
      background: #28a745;
    }
    .task small {
      display: block;
      font-size: 12px;
      color: #666;
      margin-top: 5px;
    }