:root {
  --nav-size: 50px;
  --nav-collapsed: 50px;
  --nav-expanded: 200px;
  --nav-width: var(--nav-collapsed);
  --divider: var(--qh-border);
}

body[data-sidebar-pinned="true"] {
  --nav-width: var(--nav-expanded);
}

.app-shell {
  min-height: 100vh;
  padding-top: var(--nav-size);
  position: relative;
  display: flex;
  flex-direction: column;
}

.app-layout {
  display: flex;
  flex: 1;
  width: 100%;
  min-height: calc(100vh - var(--nav-size));
  min-height: calc(100dvh - var(--nav-size));
}

[data-layout-sidebar] {
  position: relative;
  flex: 0 0 var(--nav-width);
  width: var(--nav-width);
  min-width: var(--nav-width);
  align-self: stretch;
  overflow: visible;
}

[data-layout-sidebar] > .side-nav-shell {
  height: 100%;
}

.side-nav-shell {
  position: relative;
  width: 100%;
  min-width: 100%;
  overflow: visible;
}

.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-size);
  background: var(--qh-surface);
  border-bottom: 1px solid var(--divider);
  z-index: 30;
  display: flex;
  align-items: center;
}

.side-nav-shell .side-nav {
  position: fixed;
  top: var(--nav-size);
  left: 0;
  bottom: 0;
  min-height: calc(100vh - var(--nav-size));
  min-height: calc(100dvh - var(--nav-size));
  width: var(--nav-width);
  z-index: 20;
  overflow: visible;
  box-sizing: border-box;
}

.side-nav .side-nav-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--nav-width);
  height: 100%;
  background: var(--qh-surface);
  border-right: 1px solid var(--divider);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: var(--qh-space-4) var(--qh-space-3);
  box-sizing: border-box;
  pointer-events: auto;
  transition: width var(--qh-duration-fast) var(--qh-ease-default);
  z-index: 20;
  isolation: isolate;
}

body[data-sidebar-pinned="true"] .side-nav .side-nav-overlay {
  width: var(--nav-expanded);
}

body:not([data-sidebar-pinned="true"]) .side-nav-shell:hover .side-nav .side-nav-overlay,
body:not([data-sidebar-pinned="true"]) .side-nav .side-nav-overlay:hover {
  width: var(--nav-expanded);
  z-index: 40;
}

.side-nav .nav-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  align-items: stretch;
  position: relative;
  z-index: 1;
}

.side-nav .nav-group--legacy {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--divider);
}

.side-nav .nav-group--legacy .nav-item {
  opacity: 0.55;
}

.side-nav .nav-group--legacy .nav-item:hover,
.side-nav .nav-group--legacy .nav-item.active {
  opacity: 1;
}

.nav-item {
  width: 100%;
  height: 40px;
  border-radius: var(--qh-radius-md);
  border: 1px solid transparent;
  background: transparent;
  display: grid;
  grid-template-columns: 28px 1fr;
  align-items: center;
  column-gap: var(--qh-space-3);
  padding: 0 var(--qh-space-3) 0 0;
  color: var(--qh-text-primary);
  cursor: pointer;
  position: relative;
  transition: background-color var(--qh-duration-fast) var(--qh-ease-default), color var(--qh-duration-fast) var(--qh-ease-default);
  overflow: visible;
  text-decoration: none;
  box-sizing: border-box;
}

.nav-item svg {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  justify-self: center;
}

.nav-label {
  font-size: var(--qh-font-size-body-sm);
  color: var(--qh-text-primary);
  white-space: nowrap;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--qh-duration-fast) var(--qh-ease-default), transform var(--qh-duration-fast) var(--qh-ease-default);
}

body:not([data-sidebar-pinned="true"]) .side-nav-shell:hover .nav-label {
  opacity: 1;
  transform: translateX(0);
}

body[data-sidebar-pinned="true"] .nav-label {
  opacity: 1;
  transform: translateX(0);
}

.nav-item.active {
  color: var(--qh-text-primary);
  background: color-mix(in srgb, var(--qh-accent) 2.5%, transparent);
}

.nav-item.active svg {
  color: var(--qh-accent);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: calc(var(--qh-space-3) * -1);
  top: var(--qh-space-2);
  bottom: var(--qh-space-2);
  width: 2px;
  background: var(--qh-accent);
  box-shadow: var(--qh-shadow-nav-active-glow);
  pointer-events: none;
}

body:not([data-sidebar-pinned="true"]) .side-nav-shell:not(:hover) .nav-item {
  border-color: transparent;
  background: transparent;
  color: var(--qh-text-secondary);
}

body:not([data-sidebar-pinned="true"]) .side-nav-shell:not(:hover) .nav-item.active {
  color: var(--qh-text-secondary);
}

body:not([data-sidebar-pinned="true"]) .side-nav-shell:not(:hover) .nav-label {
  width: 0;
  overflow: hidden;
  opacity: 0;
}

.nav-item:hover {
  color: var(--qh-text-primary);
  background: color-mix(in srgb, var(--qh-accent) 2%, transparent);
}

.nav-item:hover svg {
  color: color-mix(in srgb, var(--qh-accent) 55%, transparent);
}

.app-content {
  flex: 1;
  min-width: 0;
  padding: 0 24px;
  box-sizing: border-box;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  box-sizing: border-box;
  width: 100%;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-footer {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--divider);
  padding-top: var(--qh-space-3);
  z-index: 2;
  pointer-events: auto;
}

.brand {
  font-size: var(--qh-font-size-title);
  font-weight: var(--qh-font-weight-bold);
  letter-spacing: var(--qh-letter-tight);
}

/* ─── Page shader decor (shared by all app pages) ────────────────────────
   Fixed canvas on the right, blurred, mask-dissolved into the content side.
   Created by src/layout/page-shader.ts; fade-in via .shader-ready.
   2.5s fade is the UX rule for heavy visuals (CLAUDE.md), not a token case. */

.shader-decor {
  position: fixed;
  top: 0;
  right: 0;
  width: 60%;
  left: 40%;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
  filter: blur(12px);
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 40%),
                      linear-gradient(to top, transparent 0%, black 10%);
  -webkit-mask-composite: destination-in;
  mask-image: linear-gradient(to right, transparent 0%, black 40%),
              linear-gradient(to top, transparent 0%, black 10%);
  mask-composite: intersect;
  opacity: 0;
  transition: opacity 2.5s var(--qh-ease-default);
}

.shader-decor.shader-ready {
  opacity: 1;
}