* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  height: 100%;
  font-family: Arial, Helvetica, sans-serif;
}
body {
  background: #f3f4f6;
  color: #111827;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.card {
  width: 100%;
  max-width: 520px;
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.header {
  margin-bottom: 8px;
}
.title {
  font-weight: 600;
  font-size: 18px;
}

.inpt {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
}
#inpttask {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid #e5e7eb;
  border-radius: 999px;
  font-size: 14px;
}
#inpttask:focus {
  outline: 2px solid rgba(0, 0, 0, 0.06);
}
#add {
  padding: 9px 12px;
  border-radius: 999px;
  border: none;
  background: #2563eb;
  color: white;
  cursor: pointer;
  font-weight: 600;
}

ul.task-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

li.task-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  border-radius: 6px;
  background: #fafafa;
  border: 1px solid #f1f5f9;
}
.task-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}
.checkbox {
  width: 16px;
  height: 16px;
}
.task-text {
  font-size: 14px;
  color: #111827;
  word-break: break-word;
}

.completed .task-text {
  text-decoration: line-through;
  color: #6b7280;
}

.delete-btn {
  background: transparent;
  border: none;
  color: #dc2626;
  cursor: pointer;
  padding: 6px;
  font-weight: 600;
}

@media (max-width: 420px) {
  .card {
    padding: 12px;
  }
  #inpttask {
    font-size: 13px;
  }
  #add {
    padding: 8px 10px;
  }
}