* { 
  box-sizing: border-box; 
}

body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  min-height: 100vh;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.utility {
  width: 90%;
  max-width: 900px;
  margin: auto 2rem;
  padding: 2rem;
  background: #fff;
  border: 1px solid #37dd37;
  border-radius: 12px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.12);
}

h1 { text-align: center; margin: 0 0 1rem; }

.mode {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 1rem;
}
.mode label { cursor: pointer; }

.row {
  display: flex;
  gap: .5rem;
  justify-content: center;
  align-items: center;
}
input#valueInput {
  flex: 1;
  max-width: 520px;
  padding: .75rem 1rem;
  font-size: 1rem;
  border: 1px solid #c8e6c9;
  border-radius: 8px;
  outline: none;
  transition: border-color .25s ease, box-shadow .25s ease;
}
input#valueInput:focus {
  border-color: #2e7d32;
  box-shadow: 0 0 0 3px rgba(46,125,50,.15);
}

button {
  padding: .75rem 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: transform .12s ease, background .25s ease;
}
button:hover { transform: translateY(-1px); }
button:active { transform: scale(0.98); }

button.primary { background: #2e7d32; color: #fff; }
button.primary:hover { background: #1b5e20; }

button.secondary { background: #eef3ef; color: #1b5e20; }

.list-wrap { margin: 1rem 0; }
.pill-list {
  min-height: 40px;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  padding: .5rem 0;
  border-top: 1px dashed #cbd5e1;
  border-bottom: 1px dashed #cbd5e1;
}
.pill {
  padding: .35rem .6rem;
  border: 1px solid #c8e6c9;
  border-radius: 999px;
  background: #f6fff6;
  font-size: .95rem;
}

.submit-wrap { display: flex; justify-content: center; margin-top: 1rem; }

.output {
  margin-top: 1rem;
  padding: 1rem;
  background: #f7faf7;
  border: 1px solid #e0f2e0;
  border-radius: 10px;
  line-height: 1.6;
  font-size: 1rem;
  word-break: break-word;
}
.output .title { font-weight: bold; color: #1b5e20; }