/* ============================================================
   UI Kit — Base: reset, typography, application shell
   ============================================================ */

@font-face { font-family:'Inter'; font-weight:400; font-style:normal; font-display:swap;
  src: local('Inter'), url('../../fonts/inter-latin-400-normal.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-weight:500; font-style:normal; font-display:swap;
  src: local('Inter Medium'), url('../../fonts/inter-latin-500-normal.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-weight:600; font-style:normal; font-display:swap;
  src: local('Inter SemiBold'), url('../../fonts/inter-latin-600-normal.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-weight:700; font-style:normal; font-display:swap;
  src: local('Inter Bold'), url('../../fonts/inter-latin-700-normal.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-weight:800; font-style:normal; font-display:swap;
  src: local('Inter ExtraBold'), url('../../fonts/inter-latin-800-normal.woff2') format('woff2'); }

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing:border-box; }
* { margin:0; padding:0; }
html { -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
html, body { height:100%; }
body {
  font-family:var(--font-sans);
  font-size:var(--text-base);
  line-height:var(--leading-normal);
  color:var(--text);
  background:var(--page);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}
img, svg, video, canvas { display:block; max-width:100%; }
img, video { height:auto; }
input, button, textarea, select { font:inherit; color:inherit; }
button { background:none; border:0; cursor:pointer; }
ul, ol { list-style:none; }
a { color:var(--text-brand); text-decoration:none; }
a:hover { text-decoration:underline; }
table { border-collapse:collapse; width:100%; }
hr { border:0; height:1px; background:var(--line); }
/* Components toggle visibility with the hidden attribute; without this any
   class that sets display (.d-flex, .dt-selection-bar, …) would beat it. */
[hidden] { display:none !important; }
:target { scroll-margin-top:calc(var(--topbar-h) + var(--space-4)); }

/* Visible, consistent focus for keyboard users only */
:focus-visible { outline:2px solid var(--brand-500); outline-offset:2px; border-radius:var(--radius-xs); }
:focus:not(:focus-visible) { outline:none; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 { font-weight:700; letter-spacing:-.01em; line-height:var(--leading-tight); color:var(--text); }
h1 { font-size:var(--text-2xl); }
h2 { font-size:var(--text-xl); }
h3 { font-size:var(--text-lg); }
h4 { font-size:var(--text-md); }
h5 { font-size:var(--text-base); }
h6 { font-size:var(--text-sm); text-transform:uppercase; letter-spacing:var(--tracking-wide); color:var(--text-muted); }

p { line-height:var(--leading-normal); }
small { font-size:var(--text-sm); }
strong, b { font-weight:600; }
code, kbd, samp, pre, .mono { font-family:var(--font-mono); font-size:.92em; }
code:not(pre code) {
  background:var(--surface-sunken); border:1px solid var(--line-soft);
  border-radius:var(--radius-xs); padding:1px 5px; color:var(--text);
}
kbd {
  display:inline-block; background:var(--surface); border:1px solid var(--line);
  border-bottom-width:2px; border-radius:var(--radius-xs); padding:1px 6px;
  font-size:var(--text-2xs); font-weight:600; color:var(--text-muted); line-height:1.5;
}
blockquote {
  border-inline-start:3px solid var(--brand-300); padding:var(--space-1) var(--space-4);
  color:var(--text-muted); font-style:italic;
}
mark { background:var(--accent-100); color:var(--text); border-radius:3px; padding:0 3px; }
::selection { background:var(--brand-200); color:var(--brand-900); }

.lead { font-size:var(--text-md); color:var(--text-muted); line-height:var(--leading-loose); }
.muted { color:var(--text-muted); }
.subtle { color:var(--text-subtle); }
.tiny { font-size:var(--text-2xs); }
.small { font-size:var(--text-sm); }
.overline { font-size:var(--text-2xs); font-weight:700; letter-spacing:var(--tracking-wider); text-transform:uppercase; color:var(--text-muted); }
.numeric { font-variant-numeric:tabular-nums; }
.truncate { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.clamp-2 { display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }
.clamp-3 { display:-webkit-box; -webkit-line-clamp:3; -webkit-box-orient:vertical; overflow:hidden; }

/* Screen-reader-only, with a skip-link variant that appears on focus */
.sr-only {
  position:absolute; width:1px; height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}
.skip-link {
  position:absolute; inset-inline-start:var(--space-3); top:-60px; z-index:var(--z-toast);
  background:var(--surface); border:1px solid var(--line); border-radius:var(--radius-sm);
  padding:var(--space-2) var(--space-4); font-weight:600; box-shadow:var(--shadow-md);
  transition:top var(--duration-base) var(--ease-out);
}
.skip-link:focus { top:var(--space-3); }

/* ============================================================
   Application shell
   ============================================================ */
.app {
  display:grid;
  grid-template-columns:var(--sidebar-w) minmax(0,1fr);
  min-height:100vh;
  transition:grid-template-columns var(--duration-base) var(--ease-out);
}
.app[data-sidebar="collapsed"] { grid-template-columns:var(--sidebar-w-collapsed) minmax(0,1fr); }

/* ---------- Sidebar ---------- */
.sidebar {
  background:#1b2738;
  color:#cdd9ee; display:flex; flex-direction:column;
  position:sticky; top:0; height:100vh; overflow:hidden; z-index:var(--z-sticky);
}
:root[data-theme="dark"] .sidebar { background:#172231; border-inline-end:1px solid var(--line); }

.brand { display:flex; align-items:center; gap:var(--space-3); padding:18px var(--space-4) var(--space-4); flex:none; }
.brand-logo { display:block; width:100%; max-width:216px; height:auto; }
.brand-mark {
  width:38px; height:38px; border-radius:10px; flex:none;
  background:linear-gradient(135deg, var(--accent-500), var(--accent-300));
  display:grid; place-items:center; color:var(--brand-900);
  font-weight:800; font-size:var(--text-md); letter-spacing:.02em;
  box-shadow:inset 0 -2px 0 rgba(0,0,0,.15);
}
.brand-name { font-weight:700; color:#fff; font-size:var(--text-base); line-height:1.15; white-space:nowrap; }
.brand-sub { font-size:var(--text-2xs); color:#8fa5c9; letter-spacing:var(--tracking-wide); text-transform:uppercase; white-space:nowrap; }

.sidebar-scroll { flex:1; overflow-y:auto; overscroll-behavior:contain; padding-bottom:var(--space-4); }
.nav-section {
  padding:var(--space-3) var(--space-4) var(--space-1);
  font-size:var(--text-2xs); letter-spacing:var(--tracking-wider);
  text-transform:uppercase; color:#91a0b6; font-weight:600; white-space:nowrap;
}
.nav { padding:0 10px; }
.nav a {
  display:flex; align-items:center; gap:10px; padding:8px 10px; border-radius:var(--radius-sm);
  color:#c3d1e8; font-weight:500; font-size:var(--text-base); white-space:nowrap;
  transition:background var(--duration-fast) var(--ease-out), color var(--duration-fast) var(--ease-out);
}
.nav a:hover { background:rgba(255,255,255,.06); color:#fff; text-decoration:none; }
.nav a.active { background:rgba(255,255,255,.12); color:#fff; font-weight:600; box-shadow:inset 3px 0 0 var(--accent-500); }
.nav a .ic { width:17px; height:17px; flex:none; opacity:.9; }
.nav a .count {
  margin-inline-start:auto; background:rgba(255,255,255,.14); color:#fff;
  border-radius:var(--radius-pill); font-size:var(--text-2xs); font-weight:600; padding:1px 7px;
}
.nav a .count.alert { background:var(--danger-500); }

.sidebar-foot {
  margin-top:auto; padding:var(--space-3) var(--space-4);
  border-top:1px solid rgba(255,255,255,.08); display:flex; gap:10px; align-items:center; flex:none;
}
.sidebar-foot .who { font-size:var(--text-sm); color:#fff; font-weight:600; line-height:1.2; white-space:nowrap; }
.sidebar-foot .role { font-size:var(--text-2xs); color:#8fa5c9; white-space:nowrap; }

/* Collapsed rail: labels fold away, icons stay centred */
.app[data-sidebar="collapsed"] .brand-text,
.app[data-sidebar="collapsed"] .brand-logo,
.app[data-sidebar="collapsed"] .nav-section,
.app[data-sidebar="collapsed"] .nav a span:not(.count),
.app[data-sidebar="collapsed"] .sidebar-foot .who,
.app[data-sidebar="collapsed"] .sidebar-foot .role { display:none; }
.app[data-sidebar="collapsed"] .nav a { justify-content:center; padding:9px 0; }
.app[data-sidebar="collapsed"] .brand, .app[data-sidebar="collapsed"] .sidebar-foot { justify-content:center; padding-inline:0; }

/* ---------- Main column ---------- */
.main { display:flex; flex-direction:column; min-width:0; }

.topbar {
  display:flex; align-items:center; gap:var(--space-3);
  padding:0 var(--space-6); min-height:var(--topbar-h);
  background:var(--surface); border-bottom:1px solid var(--line);
  position:sticky; top:0; z-index:var(--z-sticky);
}
.topbar-actions { margin-inline-start:auto; display:flex; gap:10px; align-items:center; }

.searchbox {
  flex:1; max-width:520px; display:flex; align-items:center; gap:var(--space-2);
  background:var(--surface-sunken); border:1px solid var(--line);
  border-radius:var(--radius-sm); padding:7px 12px; color:var(--text-muted);
  transition:border-color var(--duration-fast), box-shadow var(--duration-fast);
}
.searchbox:focus-within { border-color:var(--brand-400); box-shadow:var(--focus-ring); }
.searchbox input { border:0; outline:0; background:transparent; flex:1; min-width:0; color:var(--text); }
.searchbox input::placeholder { color:var(--text-subtle); }

.content {
  padding:var(--space-5) var(--space-6) var(--space-7);
  display:flex; flex-direction:column; gap:var(--space-4);
  flex:1; min-width:0;
}
.content-narrow { max-width:960px; width:100%; }

.page-head { display:flex; align-items:flex-start; gap:var(--space-4); flex-wrap:wrap; }
.page-head h1 { font-size:var(--text-xl); }
.page-head .sub { color:var(--text-muted); margin-top:2px; font-size:var(--text-base); }
.page-head .actions { margin-inline-start:auto; display:flex; gap:var(--space-2); align-items:center; flex-wrap:wrap; }

/* ---------- Layout primitives ---------- */
.grid-2 { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:var(--space-4); }
.grid-3 { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:var(--space-4); }
.grid-4 { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:var(--space-4); }
.split-main { display:grid; grid-template-columns:minmax(0,1fr) 360px; gap:var(--space-4); align-items:start; }
.split-aside { display:grid; grid-template-columns:280px minmax(0,1fr); gap:var(--space-4); align-items:start; }
.auto-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(var(--min,240px),1fr)); gap:var(--space-4); }

.stack { display:flex; flex-direction:column; gap:var(--space-4); }
.stack-sm { display:flex; flex-direction:column; gap:var(--space-2); }
.row { display:flex; align-items:center; gap:var(--space-3); }
.row-wrap { display:flex; align-items:center; gap:var(--space-3); flex-wrap:wrap; }
.row-end { display:flex; align-items:center; gap:var(--space-3); justify-content:flex-end; }
.spacer { flex:1; }

.container { width:100%; max-width:var(--container-max); margin-inline:auto; padding-inline:var(--space-6); }
.center-screen { min-height:100vh; display:grid; place-items:center; padding:var(--space-6); }

/* ---------- Responsive shell ---------- */
@media (max-width:1180px) {
  .split-main, .split-aside { grid-template-columns:minmax(0,1fr); }
  .grid-4 { grid-template-columns:repeat(2,minmax(0,1fr)); }
}
@media (max-width:900px) {
  .app { grid-template-columns:minmax(0,1fr); }
  .sidebar {
    position:fixed; inset-block:0; inset-inline-start:0; width:var(--sidebar-w);
    transform:translateX(-102%); transition:transform var(--duration-base) var(--ease-out);
    z-index:var(--z-drawer); box-shadow:var(--shadow-xl);
  }
  .app[data-sidebar="open"] .sidebar { transform:none; }
  .app[data-sidebar="collapsed"] { grid-template-columns:minmax(0,1fr); }
  .app[data-sidebar="collapsed"] .brand-text,
  .app[data-sidebar="collapsed"] .nav-section,
  .app[data-sidebar="collapsed"] .nav a span:not(.count) { display:revert; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns:minmax(0,1fr); }
  .content { padding:var(--space-4) var(--space-4) var(--space-6); }
  .topbar { padding-inline:var(--space-4); }
}
@media (min-width:901px) { .sidebar-backdrop { display:none !important; } }

.sidebar-backdrop {
  position:fixed; inset:0; background:var(--surface-overlay);
  z-index:calc(var(--z-drawer) - 1); opacity:0; pointer-events:none;
  transition:opacity var(--duration-base) var(--ease-out);
}
.app[data-sidebar="open"] .sidebar-backdrop { opacity:1; pointer-events:auto; }

/* ---------- Scrollbars ---------- */
* { scrollbar-width:thin; scrollbar-color:var(--line-strong) transparent; }
::-webkit-scrollbar { width:10px; height:10px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:var(--line-strong); border-radius:var(--radius-pill); border:3px solid transparent; background-clip:content-box; }
::-webkit-scrollbar-thumb:hover { background:var(--text-subtle); background-clip:content-box; }

/* ---------- Print ---------- */
@media print {
  .sidebar, .topbar, .no-print, .toast-region, .scrolltop { display:none !important; }
  .app { grid-template-columns:1fr; }
  body { background:#fff; }
  .card { box-shadow:none; border-color:#ccc; break-inside:avoid; }
}