/* Base + app shell: topbar, side nav, content area */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--font-sans); font-size: var(--fs-md);
  line-height: var(--lh-body); color: var(--c-text); background: var(--c-bg-canvas);
}
a { color: var(--c-primary-600); text-decoration: none; }
a:hover { text-decoration: underline; }
h1,h2,h3,h4 { margin: 0; line-height: var(--lh-tight); font-weight: 700; }
h1 { font-size: var(--fs-h1); } h2 { font-size: var(--fs-h2); } h3 { font-size: var(--fs-h3); }
:focus-visible { outline: none; box-shadow: var(--focus-ring); border-radius: var(--radius-sm); }
.muted { color: var(--c-text-muted); }
.nowrap { white-space: nowrap; }
.mono { font-family: var(--font-mono); }
.sr-only { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); }

/* ---------- Shell ---------- */
.app { display: grid; grid-template-rows: var(--topbar-h) 1fr; grid-template-columns: minmax(0,1fr); min-height: 100vh; }
.app-body { display: grid; grid-template-columns: var(--nav-w) minmax(0,1fr); min-height: 0; transition: grid-template-columns .15s; }
.app.nav-collapsed .app-body { grid-template-columns: var(--nav-w-collapsed) minmax(0,1fr); }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50; display: flex; align-items: center; gap: var(--s-3);
  padding: 0 var(--s-4); height: var(--topbar-h); background: var(--c-brand-800); color: var(--c-text-on-dark);
  border-bottom: 1px solid #414d5c;
}
.topbar .brand { font-weight: 700; letter-spacing: .2px; display: flex; align-items: center; gap: var(--s-2); color: #fff; min-width: 0; flex: 0 1 auto; }
.topbar .brand:hover { text-decoration: none; }
.topbar .brand-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar > * { flex-shrink: 0; }
.topbar > .brand, .topbar > .search, .topbar > .spacer { flex-shrink: 1; }
.topbar .icon-btn.search-mini { display: none; }
.topbar .brand-mark { flex: none; }
.topbar .brand-mark { width: 22px; height: 22px; border-radius: 5px; background: var(--c-accent-600); display: grid; place-items: center; font-size: 12px; }
.topbar .search {
  flex: 0 1 460px; display: flex; align-items: center; gap: var(--s-2); height: 28px; padding: 0 var(--s-3);
  background: #0f1b2a; border: 1px solid #5f6b7a; border-radius: var(--radius-sm); color: var(--c-text-on-dark-muted);
}
.topbar .search input { flex: 1; background: none; border: 0; color: #fff; font: inherit; outline: none; }
.topbar .search kbd { font-size: 11px; opacity: .8; }
.topbar .spacer { flex: 1; }
.topbar .icon-btn, .topbar .menu-btn {
  background: none; border: 0; color: var(--c-text-on-dark); cursor: pointer; height: 28px; min-width: 28px;
  border-radius: var(--radius-sm); font: inherit; padding: 0 var(--s-2);
}
.topbar .icon-btn:hover, .topbar .menu-btn:hover { background: rgba(255,255,255,.12); }
.topbar .tenant { font-size: var(--fs-sm); color: var(--c-text-on-dark-muted); border-left: 1px solid #414d5c; padding-left: var(--s-3); }

/* ---------- Side nav ---------- */
.sidenav {
  background: var(--c-bg-surface); border-right: 1px solid var(--c-border);
  padding: var(--s-4) 0; overflow-y: auto; height: calc(100vh - var(--topbar-h));
  position: sticky; top: var(--topbar-h);
}
.sidenav h2 { font-size: var(--fs-md); padding: 0 var(--s-5) var(--s-3); }
.nav-group { margin: 0; padding: 0; list-style: none; }
.nav-group > li > .nav-title {
  display: flex; align-items: center; gap: var(--s-2); width: 100%; padding: var(--s-2) var(--s-5);
  background: none; border: 0; font: inherit; font-weight: 700; color: var(--c-text); cursor: pointer; text-align: left;
}
.nav-group > li > .nav-title::before { content: "▸"; font-size: 10px; color: var(--c-text-muted); transition: transform .12s; }
.nav-group > li.open > .nav-title::before { transform: rotate(90deg); }
.nav-sub { list-style: none; margin: 0; padding: 0; display: none; }
li.open > .nav-sub { display: block; }
.nav-sub a {
  display: block; padding: 5px var(--s-5) 5px 44px; color: var(--c-text); border-left: 4px solid transparent;
}
.nav-sub a:hover { background: var(--c-bg-hover); text-decoration: none; }
.nav-sub a[aria-current="page"] { color: var(--c-primary-600); font-weight: 700; border-left-color: var(--c-primary-600); background: var(--c-primary-100); }
.nav-divider { height: 1px; background: var(--c-border); margin: var(--s-3) var(--s-5); }
.app.nav-collapsed .sidenav h2, .app.nav-collapsed .nav-sub, .app.nav-collapsed .nav-title span { display: none; }

/* ---------- Content ---------- */
.content { min-width: 0; }
.content-inner { max-width: var(--content-max); margin: 0 auto; padding: var(--s-5) var(--s-6) var(--s-10); display: flex; flex-direction: column; gap: var(--s-5); }
.banner { background: var(--c-primary-500); color: #fff; padding: var(--s-2) var(--s-6); display: flex; gap: var(--s-3); align-items: center; font-size: var(--fs-sm); }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: var(--s-2); font-size: var(--fs-sm); color: var(--c-text-muted); list-style: none; margin: 0; padding: 0; }
.breadcrumbs li + li::before { content: "›"; margin-right: var(--s-2); }
.page-header { display: flex; justify-content: space-between; align-items: flex-start; gap: var(--s-4); flex-wrap: wrap; }
.page-header p { margin: var(--s-1) 0 0; color: var(--c-text-muted); }
.actions { display: flex; gap: var(--s-2); flex-wrap: wrap; }

/* Grid helpers */
.grid { display: grid; gap: var(--s-5); grid-template-columns: minmax(0,1fr); }
/* grid children may shrink below their content (a wide table scrolls inside its card instead of stretching the page) */
.grid > *, .layout-2 > * { min-width: 0; }
.cols-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.cols-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.cols-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
.span-2 { grid-column: span 2; }

/* ---------- Responsive ---------- */
/* Laptops / tablets (801-1279px): icon-only menu by default so tables get the room; the menu button expands it */
@media (min-width: 801px) and (max-width: 1199px) {
  .app:not(.nav-expanded) .app-body { grid-template-columns: var(--nav-w-collapsed) minmax(0,1fr); }
  .app:not(.nav-expanded) .nav-link { padding-left: 16px; }
  .app:not(.nav-expanded) .nav-link .tx { display: none; }
  .content-inner { padding-left: var(--s-5); padding-right: var(--s-5); }
}
@media (max-width: 1100px) { .cols-4 { grid-template-columns: repeat(2, minmax(0,1fr)); } .cols-3 { grid-template-columns: repeat(2, minmax(0,1fr)); } }
@media (max-width: 800px) {
  .app-body, .app.nav-collapsed .app-body { grid-template-columns: minmax(0,1fr); }
  .sidenav { position: fixed; left: 0; top: var(--topbar-h); width: var(--nav-w); z-index: 40; transform: translateX(-100%); transition: transform .15s; box-shadow: var(--shadow-pop); }
  .app.nav-open .sidenav { transform: none; }
  .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; } .span-2 { grid-column: auto; }
  .topbar { gap: var(--s-2); padding: 0 var(--s-2); }
  .topbar .search, .topbar .tenant, .topbar .icon-btn[data-toggle-density] { display: none; }
  .topbar .icon-btn.search-mini { display: inline-grid; }
  .topbar .demo-pill { display: none; }
  .topbar #top-new { padding: 0; width: 30px; border-radius: 50%; }
  .topbar #top-new .lbl { display: none; }
  .app.nav-open .content { pointer-events: none; }
}
@media (max-width: 480px) {
  .topbar .brand-name { display: none; }   /* phones: the logo alone links home, leaving room for the buttons */
  .app.nav-open .content::after { content: ""; position: fixed; inset: var(--topbar-h) 0 0 0; background: rgba(15,20,26,.4); z-index: 30; }
  .content-inner { padding: var(--s-4); }
}