/* ============================================================
   tabs.component.css  --  Tabs component styles
   Uses native radio inputs and labels to switch panels without JavaScript.
   Sliding pill indicator animated via CSS transforms.
   ============================================================ */

.vui-tabs {
  --_vui-bg-elevated: var(--vui-bg-elevated, #ffffff);
  --_vui-bg-surface: var(--vui-bg-surface, #f2f2f2);
  --_vui-fg: var(--vui-fg, #1a1a1a);
  --_vui-fg-muted: var(--vui-fg-muted, #6b6b6b);
  --_vui-border: var(--vui-border, #d4d4d4);
  --_vui-accent: var(--vui-accent, #1a1a1a);
  --_vui-font-sans: var(--vui-font-sans, "Inter", "Segoe UI", system-ui, -apple-system, sans-serif);
  --_vui-duration: var(--vui-duration, 150ms);
  --_vui-tab-count: 3;
  font-family: var(--_vui-font-sans);
  box-sizing: border-box;
}

.vui-tabs *,
.vui-tabs *::before,
.vui-tabs *::after {
  box-sizing: inherit;
}

.vui-tabs-control {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

/* ---- Tab bar ---- */

.vui-tabs-list {
  position: relative;
  display: flex;
  padding: 0.25rem;
  border: 1px solid var(--_vui-border);
  border-radius: 999px;
  background: var(--_vui-bg-surface);
  margin-bottom: 1rem;
}

/* Sliding pill indicator */
.vui-tabs-list::before {
  content: "";
  position: absolute;
  top: 0.25rem;
  bottom: 0.25rem;
  left: 0.25rem;
  width: calc((100% - 0.5rem) / var(--_vui-tab-count));
  border-radius: 999px;
  background: var(--_vui-bg-elevated);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  transition: transform var(--_vui-duration) cubic-bezier(0.25, 1, 0.5, 1);
  z-index: 0;
}

.vui-tab {
  position: relative;
  z-index: 1;
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.7rem 1rem;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--_vui-fg-muted);
  font-family: var(--_vui-font-sans);
  font-size: inherit;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  transition: color 200ms ease;
}

/* ---- Active tab text color ---- */

#vui-tab-overview:checked ~ .vui-tabs-list label[for="vui-tab-overview"],
#vui-tab-specs:checked ~ .vui-tabs-list label[for="vui-tab-specs"],
#vui-tab-notes:checked ~ .vui-tabs-list label[for="vui-tab-notes"] {
  color: var(--_vui-fg);
}

/* ---- Slide indicator to active tab ---- */

#vui-tab-overview:checked ~ .vui-tabs-list::before {
  transform: translateX(0);
}

#vui-tab-specs:checked ~ .vui-tabs-list::before {
  transform: translateX(100%);
}

#vui-tab-notes:checked ~ .vui-tabs-list::before {
  transform: translateX(200%);
}

/* ---- Panels ---- */

.vui-tab-panels {
  border: 1px solid var(--_vui-border);
  border-radius: 10px;
  background: var(--_vui-bg-elevated);
}

.vui-tab-panel {
  display: none;
  padding: 1rem 1.1rem;
}

.vui-tab-panel h3 {
  margin: 0 0 0.5rem;
}

.vui-tab-panel p {
  margin: 0;
  color: var(--_vui-fg-muted);
  line-height: 1.6;
}

#vui-tab-overview:checked ~ .vui-tab-panels .vui-tab-panel--overview,
#vui-tab-specs:checked ~ .vui-tab-panels .vui-tab-panel--specs,
#vui-tab-notes:checked ~ .vui-tab-panels .vui-tab-panel--notes {
  display: block;
}

/* ---- Responsive ---- */

@media (max-width: 768px) {
  .vui-tabs-list {
    gap: 0;
  }

  .vui-tab {
    min-height: 36px;
    padding: 0.5rem 0.6rem;
    font-size: 0.875rem;
  }
}