/* Text areas */
#text-input, #text-output {
  width: 100%;
  min-height: 140px;
  resize: vertical;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 14px;
  line-height: 1.6;
  color: #1a1a1a;
  outline: none;
}
#text-input:focus, #text-output:focus { border-color: #0078d4; }
#text-output { background: #f8f8f8; margin-bottom: 10px; }

.btn-clear {
  margin-top: 10px;
  padding: 8px 16px;
  background: #fff;
  color: #666;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn-clear:hover { background: #f5f5f5; color: #e74c3c; border-color: #e74c3c; }

/* Conversion button groups */
.case-group { margin-bottom: 16px; }
.case-group:last-child { margin-bottom: 0; }
.group-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #888;
  margin-bottom: 8px;
}
.btn-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.btn-case {
  padding: 9px 14px;
  background: #fff;
  color: #0078d4;
  border: 1px solid #cfe3f5;
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn-case:hover { background: #0078d4; color: #fff; border-color: #0078d4; }

.btn-copy {
  padding: 8px 14px;
  background: #0078d4;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}