* { box-sizing: border-box; }
body {
  font-family: 'Segoe UI', Tahoma, Arial, sans-serif;
  background: #f4f5f7;
  margin: 0;
  padding: 24px 16px;
  color: #1f2328;
}
.container {
  max-width: 640px;
  margin: 0 auto;
}
h1 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 20px;
  text-align: center;
}
.controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.controls label {
  font-size: 14px;
  color: #555;
}
input[type="number"] {
  width: 90px;
  padding: 8px 10px;
  border: 1px solid #d0d3d8;
  border-radius: 8px;
  font-size: 14px;
}
button {
  margin-right: auto;
  padding: 9px 18px;
  background: #2f6fed;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
button:hover { background: #2559c4; }
textarea {
  width: 100%;
  height: 480px;
  padding: 12px;
  border: 1px solid #d0d3d8;
  border-radius: 10px;
  font-size: 14px;
  resize: vertical;
  background: #fff;
  line-height: 1.6;
  overflow-y: auto;
}
#output {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 18px;
}
.card {
  background: #fff;
  border: 1px solid #e2e4e8;
  border-radius: 12px;
  padding: 12px 16px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: border-color .15s;
}
.card:hover { border-color: #b9c2d0; }
.card.done {
  background: #eafaf1;
  border-color: #b7e8cc;
}
.card.done .card-text { color: #1a9d5c; }
.card-text {
  white-space: pre-line;
  font-size: 14px;
  line-height: 1.6;
}
.copy-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: #8a8f98;
}
.copy-icon.copied { color: #1a9d5c; }
.hint {
  font-size: 12px;
  color: #8a8f98;
  text-align: center;
  margin-top: 6px;
}