body {
  background: linear-gradient(120deg,#1e3c72,#2a5298);
  font-family: Arial;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.app {
  background: white;
  width: 420px;
  padding: 25px;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0,0,0,.3);
}

h1 { text-align: center; }

.form {
  display: grid;
  gap: 10px;
}

input, select, button {
  padding: 10px;
  border-radius: 8px;
}

button {
  background: #2a5298;
  color: white;
  border: none;
  cursor: pointer;
}

.task {
  background: #f1f1f1;
  border-radius: 10px;
  padding: 10px;
  margin-top: 10px;
}

.high { border-left: 6px solid red; }
.medium { border-left: 6px solid orange; }
.low { border-left: 6px solid green; }

.done { opacity: .6; text-decoration: line-through; }