/* ============================================================
   QONVERT — Converter Page UX Enhancements
   ============================================================ */

body[data-page-category]:not([data-page-category="home"]) main {
  max-width: var(--max-width);
}

/* --- Hero --- */
.converter-hero {
  grid-column: 1 / -1;
  margin-bottom: .25rem;
}

.converter-hero-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.converter-hero .page-title {
  padding-bottom: 0;
  flex: 1;
  min-width: 12rem;
}

.converter-badges {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
}

.converter-badge {
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  padding: .25rem .75rem;
  background: var(--color-brand-subtle);
  border: 1px solid color-mix(in srgb, var(--color-brand) 18%, transparent);
  border-radius: var(--radius-full);
  font-size: .6875rem;
  font-weight: 600;
  color: var(--color-brand-dark);
  letter-spacing: .04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.converter-badge svg {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}

/* --- Sticky category tabs --- */
.converter-tabs-sentinel {
  grid-column: 1 / -1;
  height: 1px;
  margin: 0;
}

.converter-tabs-bar {
  grid-column: 1 / -1;
  position: sticky;
  top: 64px;
  z-index: 30;
  margin: 0 0 1.25rem;
  padding: .625rem 0 1rem;
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.converter-tabs-bar.is-stuck {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.converter-tabs-bar #categoryTabs {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  overflow: visible;
  border-bottom: none;
  padding-bottom: 0;
}

.converter-tabs-bar #categoryTabs a {
  text-decoration: none;
}

.converter-tabs-bar .tab-button {
  padding: .4375rem .875rem;
  font-size: .8125rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 0;
  background: var(--color-bg);
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.converter-tabs-bar .tab-button:hover:not(.active) {
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
  background: var(--color-surface-hover);
}

.converter-tabs-bar .tab-button.active {
  color: white;
  background: var(--color-brand);
  border-color: var(--color-brand);
  font-weight: 600;
}

.converter-tabs-bar .tab-button:focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 2px;
}

/* --- Workspace (form + result) --- */
.converter-workspace {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.converter-workspace .converter-form,
.converter-workspace .mb-6 {
  grid-column: 1;
}

.converter-workspace .result-card {
  grid-column: 2;
  position: sticky;
  top: calc(64px + 4.5rem);
  align-self: start;
}

.converter-form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

/* --- Unit selectors + swap --- */
.unit-selectors {
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.swap-units-btn {
  align-self: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  margin: .25rem 0;
  padding: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-brand);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.swap-units-btn svg {
  width: 1.125rem;
  height: 1.125rem;
}

.swap-units-btn:hover {
  background: var(--color-brand-subtle);
  border-color: var(--color-brand);
  color: var(--color-brand-dark);
}

.swap-units-btn:focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: no-preference) {
  .swap-units-btn:active {
    transform: rotate(180deg);
  }
}

/* --- Form & result polish --- */
body[data-page-category]:not([data-page-category="home"]) .cta-button:focus-visible,
body[data-page-category]:not([data-page-category="home"]) .action-button:focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 2px;
}

body[data-page-category]:not([data-page-category="home"]) .result-card {
  box-shadow: var(--shadow-sm);
}

body[data-page-category]:not([data-page-category="home"]) .result-card.is-updated .result-display {
  animation: result-flash .35s ease-out;
}

@keyframes result-flash {
  0% { background: color-mix(in srgb, var(--color-brand) 25%, var(--color-success-bg)); }
  100% { background: var(--color-success-bg); }
}

@media (prefers-reduced-motion: reduce) {
  body[data-page-category]:not([data-page-category="home"]) .result-card.is-updated .result-display {
    animation: none;
  }

  body[data-page-category]:not([data-page-category="home"]) .cta-button:hover,
  body[data-page-category]:not([data-page-category="home"]) .converter-tabs-bar .tab-button {
    transform: none;
  }
}

/* --- Related articles as link rows --- */
body[data-page-category]:not([data-page-category="home"]) .related-articles ul {
  gap: .5rem;
}

body[data-page-category]:not([data-page-category="home"]) .related-articles li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .625rem .875rem;
  background: var(--color-surface);
  border: 1px solid color-mix(in srgb, var(--color-brand) 15%, transparent);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

body[data-page-category]:not([data-page-category="home"]) .related-articles li a::after {
  content: '→';
  color: var(--color-brand);
  font-weight: 600;
  flex-shrink: 0;
  opacity: .7;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

body[data-page-category]:not([data-page-category="home"]) .related-articles li a:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-brand);
  text-decoration: none;
}

body[data-page-category]:not([data-page-category="home"]) .related-articles li a:hover::after {
  opacity: 1;
  transform: translateX(2px);
}

body[data-page-category]:not([data-page-category="home"]) .related-articles li a:focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 2px;
}

/* --- Active header nav --- */
body[data-page-category]:not([data-page-category="home"]) .header-nav a[href*="converter-section"] {
  color: var(--color-brand);
  background: var(--color-brand-subtle);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .converter-hero-row {
    flex-direction: column;
    gap: .75rem;
  }

  .converter-badges {
    width: 100%;
  }

  .converter-workspace {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .converter-workspace .converter-form,
  .converter-workspace .mb-6,
  .converter-workspace .result-card {
    grid-column: 1;
    position: static;
  }

  .converter-form {
    padding: 1rem;
  }

  .converter-tabs-bar {
    top: 64px;
    margin-left: -1.25rem;
    margin-right: -1.25rem;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  .converter-tabs-bar #categoryTabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: .25rem;
  }

  .converter-tabs-bar #categoryTabs::-webkit-scrollbar {
    display: none;
  }
}