/**
 * KS nav & layout primitives — depth chrome, overlays, controls.
 */
:root {
  --ks-nav-sticky-top: 0px;
  --ks-nav-z-dock: 90;
  --ks-nav-z-bar: 85;
  --ks-nav-z-overlay: 200;
  --ks-read-progress: 0%;
  --ks-split-primary: 55%;
}

/* Sticky section dock */
.ks-nav-dock-demo__section {
  min-height: 40vh;
  padding: 2rem 0;
  border-bottom: 1px solid var(--forge-border);
}

/* Scroll-spy TOC */
.ks-scroll-spy-toc {
  display: grid;
  grid-template-columns: minmax(10rem, 14rem) 1fr;
  gap: 1.5rem;
}
.ks-scroll-spy-toc__rail {
  position: sticky;
  top: 1rem;
  align-self: start;
}
@media (max-width: 768px) {
  .ks-scroll-spy-toc {
    grid-template-columns: 1fr;
  }
}

/* Chapter progress */
.ks-chapter-progress__track {
  height: 0.35rem;
  border-radius: 999px;
  background: var(--forge-surface-2);
  overflow: hidden;
}
.ks-chapter-progress__bar {
  height: 100%;
  width: var(--ks-read-progress, 0%);
  background: linear-gradient(90deg, var(--forge-cyan), var(--forge-amber));
  transition: width 0.15s ease;
}

/* Breadcrumb depth */
.ks-breadcrumb-depth .breadcrumb-item.active {
  transform: translateZ(4px);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

/* Mobile nav sheet */
.ks-mobile-nav-sheet__panel {
  box-shadow: 8px 0 24px rgba(0, 0, 0, 0.35);
}

/* Mega menu */
.ks-mega-menu {
  position: relative;
  display: inline-block;
}
.ks-mega-menu__panel {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  min-width: 18rem;
  padding: 1rem;
  border-radius: 0.5rem;
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  z-index: var(--ks-nav-z-overlay);
}

/* Segmented control */
.ks-segmented {
  display: inline-flex;
  padding: 0.2rem;
  border-radius: 0.5rem;
  background: var(--forge-surface-2);
  gap: 0.15rem;
}
.ks-segmented__item {
  margin: 0;
  cursor: pointer;
}
.ks-segmented__item input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.ks-segmented__item span {
  display: block;
  padding: 0.35rem 0.85rem;
  border-radius: 0.35rem;
  font-size: 0.85rem;
  font-weight: 600;
}
.ks-segmented__item.is-active span,
.ks-segmented__item input:checked + span {
  background: var(--forge-cyan);
  color: var(--forge-bg);
}

/* Stepper */
.ks-stepper__list {
  display: flex;
  gap: 0.75rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.ks-stepper__step {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  opacity: 0.55;
}
.ks-stepper__step.is-current {
  opacity: 1;
}
.ks-stepper__num {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--forge-surface-2);
  font-size: 0.75rem;
  font-weight: 700;
}
.ks-stepper__step.is-current .ks-stepper__num {
  background: var(--forge-cyan);
  color: var(--forge-bg);
}

/* Pagination tactile */
.ks-pagination-tactile {
  display: inline-flex;
  gap: 0.35rem;
}
.ks-pagination-tactile__btn {
  min-width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.35rem;
  border: 1px solid var(--forge-border);
  background: var(--forge-surface-2);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  cursor: pointer;
}
.ks-pagination-tactile__btn.is-active {
  background: var(--forge-cyan);
  color: var(--forge-bg);
  border-color: transparent;
}

/* Filter chip scroller */
.ks-filter-chip-scroller {
  overflow-x: auto;
  scroll-snap-type: x proximity;
}
.ks-filter-chip-scroller__track {
  display: flex;
  gap: 0.5rem;
  padding-bottom: 0.25rem;
}
.ks-filter-chip {
  flex-shrink: 0;
  scroll-snap-align: start;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--forge-border);
  background: var(--forge-surface-2);
  cursor: pointer;
}
.ks-filter-chip.is-active {
  background: var(--forge-cyan);
  color: var(--forge-bg);
  border-color: transparent;
}

/* Governed combobox */
.ks-governed-combobox {
  position: relative;
  max-width: 20rem;
}
.ks-governed-combobox__list {
  position: absolute;
  inset-inline: 0;
  top: 100%;
  margin: 0.25rem 0 0;
  padding: 0.35rem 0;
  list-style: none;
  border-radius: 0.35rem;
  border: 1px solid var(--forge-border);
  background: var(--forge-surface);
  z-index: 10;
}
.ks-governed-combobox__list li {
  padding: 0.35rem 0.75rem;
  cursor: pointer;
}
.ks-governed-combobox__list li:hover {
  background: var(--forge-surface-2);
}

/* Disclosure stack */
.ks-disclosure-stack__item {
  border: 1px solid var(--forge-border);
  border-radius: 0.5rem;
  padding: 0.65rem 0.85rem;
  margin-bottom: 0.5rem;
  background: var(--forge-surface);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}
.ks-disclosure-stack__item[open] {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.22);
}

/* Split pane */
.ks-split-pane {
  display: grid;
  grid-template-columns: var(--ks-split-primary, 55%) 4px 1fr;
  gap: 0;
  min-height: 12rem;
  border: 1px solid var(--forge-border);
  border-radius: 0.5rem;
  overflow: hidden;
}
.ks-split-pane__gutter {
  cursor: col-resize;
  background: var(--forge-border);
}
.ks-split-pane__primary,
.ks-split-pane__secondary {
  padding: 0.75rem;
  min-width: 0;
}

/* Anchor jump */
.ks-anchor-jump__bar {
  position: sticky;
  top: 0;
  z-index: var(--ks-nav-z-bar);
  display: flex;
  gap: 0.5rem;
  padding: 0.5rem 0;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--forge-border);
  background: var(--forge-bg);
}
.ks-anchor-jump__link {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  text-decoration: none;
  color: var(--forge-text-4);
  font-size: 0.85rem;
}
.ks-anchor-jump__link.is-active {
  background: var(--forge-cyan);
  color: var(--forge-bg);
}

/* Tab swimlane */
.ks-tab-swimlane__tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}
.ks-tab-swimlane__tab {
  border: 1px solid var(--forge-border);
  background: var(--forge-surface-2);
  border-radius: 0.35rem;
  padding: 0.35rem 0.85rem;
  cursor: pointer;
}
.ks-tab-swimlane__tab.is-active {
  background: var(--forge-cyan);
  color: var(--forge-bg);
  border-color: transparent;
}
.ks-tab-swimlane__section {
  min-height: 30vh;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--forge-border);
}

/* Sticky action bar */
.ks-sticky-action-bar {
  position: sticky;
  bottom: 0;
  z-index: var(--ks-nav-z-bar);
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  padding: 0.75rem;
  margin-top: 1rem;
  border-top: 1px solid var(--forge-border);
  background: rgba(var(--forge-bg-rgb, 15, 23, 42), 0.92);
  backdrop-filter: blur(8px);
}

/* Command palette */
.ks-command-palette__overlay {
  position: fixed;
  inset: 0;
  z-index: var(--ks-nav-z-overlay);
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
}
.ks-command-palette__dialog {
  width: min(32rem, 92vw);
  padding: 1rem;
  border-radius: 0.5rem;
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
}
.ks-command-palette__list {
  list-style: none;
  padding: 0.5rem 0 0;
  margin: 0;
}
.ks-command-palette__list li {
  padding: 0.5rem 0.65rem;
  border-radius: 0.35rem;
  cursor: pointer;
}
.ks-command-palette__list li:hover {
  background: var(--forge-surface-2);
}

/* Bottom sheet */
.ks-bottom-sheet__backdrop {
  position: fixed;
  inset: 0;
  z-index: calc(var(--ks-nav-z-overlay) - 1);
  background: rgba(0, 0, 0, 0.45);
}
.ks-bottom-sheet__panel {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--ks-nav-z-overlay);
  padding: 1rem 1.25rem 1.5rem;
  border-radius: 1rem 1rem 0 0;
  background: var(--forge-surface);
  border-top: 1px solid var(--forge-border);
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.35);
}
.ks-bottom-sheet__handle {
  width: 2.5rem;
  height: 0.25rem;
  margin: 0 auto 0.75rem;
  border-radius: 999px;
  background: var(--forge-border);
}

/* View transition */
.ks-view-transition__hero,
.ks-view-transition__detail {
  transition: opacity 0.3s ease;
}

/* Editorial peek rail */
.ks-editorial-peek-rail {
  position: relative;
  --ks-peek-rail-gutter: 2.75rem;
}
.ks-editorial-peek-rail .fs-rail__scroller {
  padding-inline: var(--ks-peek-rail-gutter);
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.ks-editorial-peek-rail__prev,
.ks-editorial-peek-rail__next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--forge-border);
  background: var(--forge-surface);
  cursor: pointer;
}
.ks-editorial-peek-rail__prev {
  left: 0.25rem;
}
.ks-editorial-peek-rail__next {
  right: 0.25rem;
}

@media (prefers-reduced-motion: reduce) {
  .ks-chapter-progress__bar,
  .ks-view-transition__hero,
  .ks-view-transition__detail {
    transition: none !important;
  }
}