body {
      font-family: "Segoe UI", sans-serif;
      background: linear-gradient(135deg, #74ebd5, #ACB6E5);
      margin: 0;
      padding: 20px;
      min-height: 100vh;
    }
    h1 {
      text-align: center;
      color: #fff;
      margin-bottom: 20px;
      font-size: 2.5rem;
      letter-spacing: 1px;
    }
    .todo-container {
      max-width: 600px;
      margin: 0 auto;
      background: #fff;
      padding: 25px;
      border-radius: 16px;
      box-shadow: 0 6px 20px rgba(0,0,0,0.2);
      animation: fadeIn 0.6s ease-in-out;
    }
    @keyframes fadeIn {
      from {opacity: 0; transform: translateY(20px);}
      to {opacity: 1; transform: translateY(0);}
    }
    .input-group {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
      margin-bottom: 15px;
    }
    input, button {
      padding: 12px;
      border: 1px solid #ddd;
      border-radius: 10px;
      font-size: 15px;
    }
    input[type="text"], input[type="date"] {
      flex: 1;
    }
    button {
      background: linear-gradient(135deg, #667eea, #764ba2);
      color: white;
      border: none;
      cursor: pointer;
      transition: 0.3s;
    }
    button:hover {
      background: linear-gradient(135deg, #5a67d8, #6b46c1);
      transform: scale(1.05);
    }
    ul {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    li {
      background: #f9f9ff;
      margin: 10px 0;
      padding: 15px;
      border-radius: 12px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      box-shadow: 0 2px 6px rgba(0,0,0,0.1);
      transition: 0.3s;
    }
    li:hover {
      transform: translateX(5px);
      box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    }
    .completed {
      text-decoration: line-through;
      color: gray;
    }
    .task-buttons button {
      margin-left: 5px;
      padding: 6px 10px;
      font-size: 13px;
      border-radius: 8px;
    }
    .done-btn {
      background: #38a169;
    }
    .done-btn:hover {
      background: #2f855a;
    }
    .delete-btn {
      background: #e53e3e;
    }
    .delete-btn:hover {
      background: #c53030;
    }