.kube-units-wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 0;
}

.kube-card-modern.converter-card {
  --k-primary: #7c3aed;
  --k-primary-fade: rgba(124, 58, 237, 0.08);
  --k-bg: #ffffff;
  --k-text: #1e293b;
  --k-text-light: #64748b;
  --k-border: #e2e8f0;
  --k-surface: #f8fafc;
  --k-success: #10b981;

  background: var(--k-bg);
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  border-radius: 24px;
  padding: 2.5rem;
  border: 1px solid var(--k-border);
  box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.05);
}

body.theme-dark .kube-card-modern.converter-card,
[data-theme="dark"] .kube-card-modern.converter-card {
  --k-bg: #0f172a;
  --k-surface: #111827;
  --k-text: #e2e8f0;
  --k-text-light: #94a3b8;
  --k-border: #1f2937;
  --k-primary: #a78bfa;
  --k-primary-fade: rgba(167, 139, 250, 0.12);
}

.math-header {
  margin-bottom: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.tool-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--k-primary);
  background: var(--k-primary-fade);
  padding: 6px 12px;
  border-radius: 99px;
}

.category-nav {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  padding-bottom: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--k-border);
  scrollbar-width: none;
}

.category-nav::-webkit-scrollbar {
  display: none;
}

.cat-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--k-text-light);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.cat-btn:hover {
  background: var(--k-surface);
  color: var(--k-text);
}

.cat-btn.active {
  background: var(--k-text);
  color: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.currency-note {
  font-size: 0.75rem;
  color: var(--k-text-light);
  margin: -1rem 0 1.5rem;
  display: none;
}

.currency-note.is-visible {
  display: block;
}

.converter-stage {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: end;
  margin-bottom: 2.5rem;
}

.conv-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--k-text-light);
  margin-bottom: 0.5rem;
}

.input-unit-wrapper {
  background: var(--k-surface);
  border: 2px solid transparent;
  border-radius: 16px;
  padding: 6px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s;
}

.input-unit-wrapper:focus-within {
  background: var(--k-bg);
  border-color: var(--k-primary);
  box-shadow: 0 4px 20px rgba(124, 58, 237, 0.1);
}

.conv-input {
  width: 100%;
  border: none;
  background: transparent;
  font-family: 'Courier New', monospace;
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--k-text);
  padding: 12px 12px 4px 12px;
  outline: none;
  box-sizing: border-box;
}

.conv-input.result {
  color: var(--k-primary);
}

.select-container {
  position: relative;
  width: 100%;
}

.unit-select {
  width: 100%;
  appearance: none;
  background: transparent;
  border: none;
  padding: 8px 12px 12px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--k-text-light);
  cursor: pointer;
  outline: none;
}

.chevron {
  position: absolute;
  right: 12px;
  top: 40%;
  transform: translateY(-50%);
  color: var(--k-text-light);
  pointer-events: none;
}

.swap-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--k-border);
  background: var(--k-bg);
  color: var(--k-text-light);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s;
  margin-bottom: 20px;
}

.swap-btn:hover {
  border-color: var(--k-primary);
  color: var(--k-primary);
  transform: rotate(180deg);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.result-summary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px dashed var(--k-border);
}

#formula-text {
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  color: var(--k-text-light);
  background: var(--k-surface);
  padding: 6px 12px;
  border-radius: 8px;
}

.copy-res-btn {
  background: transparent;
  border: 1px solid var(--k-border);
  border-radius: 8px;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--k-text-light);
  transition: all 0.2s;
  position: relative;
}

.copy-res-btn:hover {
  background: var(--k-primary);
  color: #ffffff;
  border-color: var(--k-primary);
}

.copy-res-btn .icon-check {
  display: none;
}

.copy-res-btn.copied {
  background: var(--k-success);
  border-color: var(--k-success);
  color: #ffffff;
}

.copy-res-btn.copied .icon-default {
  display: none;
}

.copy-res-btn.copied .icon-check {
  display: block;
}

@media (max-width: 650px) {
  .converter-stage {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .swap-btn {
    margin: 0 auto;
    transform: rotate(90deg);
  }

  .swap-btn:hover {
    transform: rotate(270deg);
  }
}