/* Protein Usage Calculator - professional card UI */
.puc-container{
  --puc-radius: 16px;
  --puc-gap: 14px;
  --puc-shadow: 0 6px 22px rgba(0,0,0,.08);
  --puc-bg: #ffffff;
  --puc-text: #111827;
  --puc-sub: #6b7280;
  --puc-border: #e5e7eb;
  --puc-primary: #2563eb;
  --puc-primary-contrast: #ffffff;
}
.puc-container[data-theme="dark"],
@media (prefers-color-scheme: dark){
  .puc-container[data-theme="auto"]{
    --puc-bg: #0f172a;
    --puc-text: #e5e7eb;
    --puc-sub: #94a3b8;
    --puc-border: #1f2937;
    --puc-primary: #3b82f6;
    --puc-primary-contrast: #0b1020;
  }
}
.puc-card{
  max-width: 720px;
  margin: 24px auto;
  background: var(--puc-bg);
  color: var(--puc-text);
  border: 1px solid var(--puc-border);
  border-radius: var(--puc-radius);
  box-shadow: var(--puc-shadow);
  padding: 24px;
}
.puc-header{
  margin-bottom: 10px;
}
.puc-title{
  margin: 0 0 6px;
  font-size: 1.5rem;
  line-height: 1.2;
}
.puc-subtitle{
  margin: 0;
  color: var(--puc-sub);
  font-size: .95rem;
}
.puc-form{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--puc-gap);
  margin-top: 14px;
}
.puc-field{
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.puc-field label{
  font-weight: 600;
  font-size: .95rem;
}
.puc-field input, .puc-field select{
  border: 1px solid var(--puc-border);
  background: transparent;
  color: var(--puc-text);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
}
.puc-field input:focus, .puc-field select:focus{
  border-color: var(--puc-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}
.puc-help{
  color: var(--puc-sub);
  font-size: .85rem;
}
.puc-actions{
  grid-column: 1 / -1;
  display: flex;
  gap: 10px;
  justify-content: flex-start;
  align-items: center;
  margin-top: 6px;
}
.puc-btn{
  border: 1px solid var(--puc-border);
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
  background: transparent;
  color: var(--puc-text);
  transition: transform .02s ease, background .2s ease, border-color .2s ease;
}
.puc-btn:active{ transform: translateY(1px); }
.puc-primary{
  background: var(--puc-primary);
  color: var(--puc-primary-contrast);
  border-color: var(--puc-primary);
}
.puc-ghost:hover{ border-color: var(--puc-primary); }
.puc-result{
  margin-top: 14px;
  padding: 14px;
  border: 1px dashed var(--puc-border);
  border-radius: 12px;
  display: grid;
  gap: 8px;
}
.puc-result-line{
  display: flex;
  justify-content: space-between;
  font-size: 1.1rem;
}
.puc-copy{
  justify-self: start;
}
.puc-footer{
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--puc-sub);
  font-size: .85rem;
}
@media (max-width: 600px){
  .puc-form{
    grid-template-columns: 1fr;
  }
}