.pc-wrapper {
  --pc-primary: #4b5563;
  --pc-primary-light: #f1f3f5;
  --pc-accent: #2c7a7b;
  --pc-success: #2d6a4f;
  --pc-danger: #9d4456;
  --pc-text: #1a202c;
  --pc-text-light: #4a5568;
  --pc-border: #d2d6dc;
  --pc-bg: #fff;

  max-width: 700px;
  margin: 0 auto;
  padding: 1.5rem;
}

.theme-dark .pc-wrapper {
  --pc-primary: #cbd5e1;
  --pc-primary-light: #334155;
  --pc-accent: #7dd3c0;
  --pc-text: #f1f5f9;
  --pc-text-light: #cbd5e1;
  --pc-border: #475569;
  --pc-bg: #1e293b;
}

.pc-card {
  background: var(--pc-bg);
  border: 1px solid var(--pc-border);
  border-radius: 12px;
  padding: 1.5rem;
}

.pc-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.35rem;
  margin-bottom: 1.5rem;
  background: var(--pc-primary-light);
  padding: 0.35rem;
  border-radius: 8px;
}

.pc-tab {
  padding: 0.6rem 0.75rem;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--pc-text-light);
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}

.pc-tab:hover {
  background: var(--pc-accent);
  color: white;
}

.pc-tab-active {
  background: var(--pc-accent);
  color: white;
}

.pc-content {
  position: relative;
}

.pc-case {
  display: none;
  animation: pc-fade-in 0.25s ease-out;
}

.pc-case-active {
  display: block;
}

@keyframes pc-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.pc-case-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--pc-text);
  margin-bottom: 1.2rem;
}

.pc-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.pc-input-field {
  display: flex;
  flex-direction: column;
}

.pc-input-field label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--pc-text);
  margin-bottom: 0.3rem;
}

.pc-input-container {
  position: relative;
  display: flex;
  align-items: center;
}

.pc-input {
  width: 100%;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--pc-border);
  border-radius: 6px;
  font-size: 0.95rem;
  background: var(--pc-bg);
  color: var(--pc-text);
  transition: all 0.2s;
}

.pc-input:focus {
  outline: none;
  border-color: var(--pc-accent);
  box-shadow: 0 0 0 2px var(--pc-primary-light);
}

.pc-unit {
  position: absolute;
  right: 0.8rem;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--pc-accent);
  pointer-events: none;
}

.pc-operation-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
}

.pc-op-btn {
  padding: 0.75rem;
  border: none;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  color: white;
}

.pc-op-add {
  background: var(--pc-success);
}

.pc-op-add:hover {
  background: #1b4332;
}

.pc-op-subtract {
  background: var(--pc-danger);
}

.pc-op-subtract:hover {
  background: #6d3a43;
}

.pc-result-display {
  background: var(--pc-primary-light);
  border: 1px solid var(--pc-border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  position: relative;
}

.pc-result-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--pc-text-light);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.pc-result-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--pc-accent);
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
}

.pc-result-unit {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--pc-accent);
}

.pc-copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  padding: 0.5rem 0.8rem;
  border: none;
  border-radius: 5px;
  background: var(--pc-accent);
  color: white;
  font-weight: 600;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s;
}

.pc-copy-btn:hover {
  background: #1f6f6f;
  transform: scale(1.05);
}

.pc-copy-btn:active {
  transform: scale(0.95);
}

.pc-formula {
  background: var(--pc-bg);
  border: 1px solid var(--pc-border);
  padding: 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--pc-text-light);
  border-left: 3px solid var(--pc-accent);
  font-weight: 500;
}

.pc-toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--pc-accent);
  color: white;
  padding: 0.85rem 1.2rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  z-index: 1000;
  animation: pc-slide-in 0.3s ease-out;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

@keyframes pc-slide-in {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@media (max-width: 640px) {
  .pc-wrapper {
    padding: 1rem;
  }

  .pc-card {
    padding: 1rem;
  }

  .pc-tabs {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.25rem;
    padding: 0.25rem;
  }

  .pc-tab {
    font-size: 0.7rem;
    padding: 0.5rem;
  }

  .pc-result-value {
    font-size: 1.8rem;
  }

  .pc-result-unit {
    font-size: 0.9rem;
  }

  .pc-inputs {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }
}