/* ==========================================================================
   layout.css — App shell: sidebar, header, content area, breadcrumbs, footer
   --------------------------------------------------------------------------
   < 992px : sidebar is an off-canvas drawer  (body.sidebar-open)
   >= 992px: sidebar is fixed; can collapse to an icon rail (body.sidebar-collapsed)
   ========================================================================== */

/* ---- Sidebar -------------------------------------------------------------- */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 1045;
  display: flex;
  flex-direction: column;
  width: min(var(--tf-sidebar-w), 86vw);
  background: var(--tf-sidebar-bg);
  border-right: 1px solid var(--tf-border);
  transform: translateX(-100%);
  visibility: hidden;
  transition: transform 220ms var(--tf-ease), visibility 0s linear 220ms, width var(--tf-dur) var(--tf-ease);
}
body.sidebar-open .sidebar {
  transform: none;
  visibility: visible;
  transition-delay: 0s;
  box-shadow: var(--tf-shadow-md);
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1040;
  background: var(--tf-overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
}
body.sidebar-open .sidebar-backdrop {
  opacity: 1;
  pointer-events: auto;
}
body.sidebar-open { overflow: hidden; }

.sidebar-brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  height: var(--tf-header-h);
  padding: 0 1.125rem 0 1.25rem;
  flex: none;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--tf-text);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  min-width: 0;
}
.brand:hover { text-decoration: none; color: var(--tf-text); }
.brand-mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 10px;
  background: var(--tf-primary);
  color: var(--tf-on-primary);
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.14), 0 1px 2px rgba(var(--tf-primary-rgb), 0.35);
}
.brand-mark .icon { width: 1.25rem; height: 1.25rem; stroke-width: 2.25; }

.sidebar-nav {
  flex: 1 1 auto;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 0.25rem 0.75rem 1rem;
}
.nav-group + .nav-group { margin-top: 1.125rem; }
.nav-group-label {
  margin: 0 0 0.375rem;
  padding: 0 0.75rem;
  font-size: 0.6875rem;
  font-weight: 650;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--tf-text-subtle);
  white-space: nowrap;
}
.nav-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }

.nav-item-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 2.5rem;
  padding: 0.4375rem 0.75rem;
  border-radius: var(--tf-radius-sm);
  color: var(--tf-text-muted);
  font-weight: 500;
  line-height: 1.25;
  white-space: nowrap;
  transition: background var(--tf-dur) var(--tf-ease), color var(--tf-dur) var(--tf-ease);
}
.nav-item-link .icon { width: 1.25rem; height: 1.25rem; }
.nav-item-link:hover {
  background: var(--tf-surface-3);
  color: var(--tf-text);
  text-decoration: none;
}
.nav-item-link[aria-current="page"] {
  background: var(--tf-primary-soft);
  color: var(--tf-primary-text);
  font-weight: 600;
}
.nav-item-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -0.75rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: var(--tf-primary);
}
.nav-item-link[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
}
.nav-item-link[aria-disabled="true"]:hover { background: transparent; color: var(--tf-text-muted); }
.nav-item-label { flex: 1 1 auto; overflow: hidden; text-overflow: ellipsis; }
.nav-soon {
  flex: none;
  font-size: 0.625rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.0625rem 0.375rem;
  border-radius: var(--tf-radius-pill);
  background: var(--tf-surface-3);
  color: var(--tf-text-subtle);
}

.sidebar-footer {
  flex: none;
  padding: 0.75rem;
  border-top: 1px solid var(--tf-border);
  display: grid;
  gap: 0.625rem;
}
.demo-note {
  display: flex;
  gap: 0.625rem;
  padding: 0.75rem;
  border-radius: var(--tf-radius);
  background: var(--tf-surface-2);
  border: 1px solid var(--tf-border);
  font-size: var(--tf-fs-xs);
  line-height: 1.45;
  color: var(--tf-text-muted);
}
.demo-note .icon { color: var(--tf-primary-text); margin-top: 0.0625rem; }
.demo-note strong { display: block; color: var(--tf-text); font-weight: 600; font-size: var(--tf-fs-sm); }

.sidebar-collapse-btn { display: none; }

/* ---- Main column ------------------------------------------------------------ */
.app-main {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 1030;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  height: var(--tf-header-h);
  padding: 0 0.75rem;
  background: color-mix(in srgb, var(--tf-surface) 88%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--tf-border);
}

.header-spacer { flex: 1 1 auto; }
.header-actions { display: flex; align-items: center; gap: 0.25rem; }

.icon-btn {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 0;
  border-radius: var(--tf-radius-sm);
  background: transparent;
  color: var(--tf-text-muted);
  transition: background var(--tf-dur) var(--tf-ease), color var(--tf-dur) var(--tf-ease);
}
.icon-btn:hover { background: var(--tf-surface-3); color: var(--tf-text); }
.icon-btn .icon { width: 1.25rem; height: 1.25rem; }
.icon-btn .badge-dot {
  position: absolute;
  top: 0.125rem;
  right: 0.0625rem;
  box-sizing: border-box;
  min-width: 1.1875rem;
  height: 1.1875rem;
  padding: 0 0.25rem;
  display: grid;
  place-items: center;
  border-radius: var(--tf-radius-pill);
  background: var(--tf-danger);
  color: #fff;
  font-size: 0.6875rem;
  font-weight: 700;
  line-height: 1;
  border: 2px solid var(--tf-surface);
  pointer-events: none;
}
.icon-btn .badge-dot[hidden] { display: none; }
[data-bs-theme="dark"] .icon-btn .badge-dot { color: #1a0505; }

/* Theme toggle swaps icons by theme */
.theme-toggle .icon-moon { display: none; }
[data-bs-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-bs-theme="dark"] .theme-toggle .icon-moon { display: inline-block; }

/* ---- Header search ---------------------------------------------------------- */
.header-search { position: relative; flex: 1 1 auto; max-width: 26rem; }
.header-search-toggle { display: inline-grid; }
.header-search .search-field { display: none; }
.header-search.is-open {
  position: absolute;
  inset: 0;
  max-width: none;
  display: flex;
  align-items: center;
  padding: 0 0.75rem;
  background: var(--tf-surface);
  z-index: 2;
}
.header-search.is-open .search-field { display: block; flex: 1; }
.header-search.is-open .header-search-toggle { display: none; }

.search-field { position: relative; }
.search-field > .icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--tf-text-subtle);
  pointer-events: none;
}
.search-field .form-control {
  padding-left: 2.375rem;
  padding-right: 2.5rem;
  background: var(--tf-surface-2);
}
.search-field .search-kbd {
  position: absolute;
  right: 0.625rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  display: none;
}
.search-results {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  right: 0;
  z-index: 1060;
  max-height: min(24rem, 70vh);
  overflow-y: auto;
  padding: 0.375rem;
  background: var(--tf-surface);
  border: 1px solid var(--tf-border);
  border-radius: var(--tf-radius);
  box-shadow: var(--tf-shadow-md);
}
.search-results[hidden] { display: none; }
.search-group {
  padding: 0.5rem 0.625rem 0.25rem;
  font-size: 0.6875rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tf-text-subtle);
}
.search-item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.5rem 0.625rem;
  border-radius: var(--tf-radius-sm);
  color: var(--tf-text);
}
.search-item:hover,
.search-item.is-active { background: var(--tf-primary-soft); text-decoration: none; color: var(--tf-text); }
.search-item .icon { color: var(--tf-text-subtle); }
.search-item small { margin-left: auto; color: var(--tf-text-subtle); }
.search-empty { padding: 1rem; text-align: center; color: var(--tf-text-muted); }

/* ---- User + notifications menus -------------------------------------------- */
.user-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem;
  border: 0;
  background: transparent;
  border-radius: var(--tf-radius-pill);
}
.user-trigger:hover { background: var(--tf-surface-3); }
.user-trigger .user-meta { display: none; text-align: left; line-height: 1.2; }
.user-trigger .user-meta strong { display: block; font-size: var(--tf-fs-sm); font-weight: 600; }
.user-trigger .user-meta span { font-size: var(--tf-fs-xs); color: var(--tf-text-muted); }

.notif-menu { width: min(22rem, calc(100vw - 1.5rem)); padding: 0; overflow: hidden; }
.notif-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem 1rem; border-bottom: 1px solid var(--tf-border);
}
.notif-list { max-height: 20rem; overflow-y: auto; }
.notif-item {
  display: flex; gap: 0.75rem; width: 100%;
  padding: 0.75rem 1rem;
  border: 0; border-bottom: 1px solid var(--tf-border);
  background: transparent; text-align: left; color: var(--tf-text);
}
.notif-item:last-child { border-bottom: 0; }
.notif-item:hover { background: var(--tf-surface-2); }
.notif-item.is-unread { background: var(--tf-primary-soft); }
.notif-item.is-unread:hover { background: var(--tf-primary-soft-hover); }
.notif-item .notif-title { font-weight: 550; line-height: 1.35; }
.notif-item .notif-time { font-size: var(--tf-fs-xs); color: var(--tf-text-subtle); }
.notif-foot { padding: 0.625rem 1rem; border-top: 1px solid var(--tf-border); text-align: center; }

/* ---- Content ------------------------------------------------------------------ */
.app-content {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--tf-content-max);
  margin-inline: auto;
  padding: 1.25rem 1rem 2rem;
}

.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.page-header-text { min-width: 0; }
.page-title { margin: 0; }
.page-subtitle { margin: 0.375rem 0 0; color: var(--tf-text-muted); max-width: 46rem; }
.page-actions { max-width: 100%; min-width: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }

.breadcrumb {
  --bs-breadcrumb-divider: "";
  --bs-breadcrumb-item-padding-x: 0;
  flex-wrap: nowrap;
  overflow: hidden;
  margin: 0 0 0.5rem;
  font-size: var(--tf-fs-sm);
  color: var(--tf-text-subtle);
}
.breadcrumb-item { display: inline-flex; align-items: center; white-space: nowrap; min-width: 0; }
.breadcrumb-item + .breadcrumb-item::before {
  content: "";
  display: inline-block;
  width: 0.375rem;
  height: 0.375rem;
  margin: 0 0.625rem;
  border-top: 1.5px solid var(--tf-border-strong);
  border-right: 1.5px solid var(--tf-border-strong);
  transform: rotate(45deg) scale(0.9);
  float: none;
  padding: 0;
}
.breadcrumb-item a { color: var(--tf-text-muted); }
.breadcrumb-item a:hover { color: var(--tf-text); }
.breadcrumb-item.active { color: var(--tf-text); font-weight: 550; overflow: hidden; text-overflow: ellipsis; }

.app-footer {
  flex: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  justify-content: space-between;
  padding: 1rem;
  border-top: 1px solid var(--tf-border);
  font-size: var(--tf-fs-sm);
  color: var(--tf-text-muted);
}
.app-footer .footer-demo { display: inline-flex; align-items: center; gap: 0.375rem; }

/* ---- Breakpoints ---------------------------------------------------------------- */
@media (min-width: 576px) {
  .app-header { padding: 0 1rem; }
  .app-content { padding: 1.5rem 1.5rem 2.5rem; }
  .app-footer { padding: 1rem 1.5rem; }
  .search-field .search-kbd { display: inline-block; }
}

@media (min-width: 768px) {
  .header-search-toggle { display: none; }
  .header-search .search-field { display: block; }
  .user-trigger { padding-right: 0.75rem; }
  .user-trigger .user-meta { display: block; }
}

@media (min-width: 992px) {
  .sidebar {
    width: var(--tf-sidebar-w);
    transform: none;
    visibility: visible;
    z-index: 1035;
    box-shadow: none;
  }
  body.sidebar-open { overflow: auto; }
  .sidebar-backdrop { display: none; }
  .sidebar-close, .header-menu-btn { display: none !important; }
  .sidebar-collapse-btn { display: inline-flex; }

  .app-main { margin-left: var(--tf-sidebar-w); transition: margin-left var(--tf-dur) var(--tf-ease); }
  .app-header { padding: 0 1.5rem; }
  .app-content { padding: 1.75rem 2rem 2.5rem; }
  .app-footer { padding: 1rem 2rem; }

  /* Icon rail */
  body.sidebar-collapsed .sidebar { width: var(--tf-sidebar-w-collapsed); }
  body.sidebar-collapsed .app-main { margin-left: var(--tf-sidebar-w-collapsed); }
  body.sidebar-collapsed .sidebar-brand { justify-content: center; padding: 0; }
  body.sidebar-collapsed .brand-name,
  body.sidebar-collapsed .nav-item-label,
  body.sidebar-collapsed .nav-soon,
  body.sidebar-collapsed .demo-note,
  body.sidebar-collapsed .sidebar-collapse-btn .btn-label { display: none; }
  body.sidebar-collapsed .sidebar-nav { padding-inline: 0.75rem; }
  body.sidebar-collapsed .nav-group-label {
    height: 1px; margin: 0.625rem 0.75rem; padding: 0; overflow: hidden;
    background: var(--tf-border); color: transparent; font-size: 0;
  }
  body.sidebar-collapsed .nav-group:first-child .nav-group-label { display: none; }
  body.sidebar-collapsed .nav-item-link { justify-content: center; padding-inline: 0; }
  body.sidebar-collapsed .nav-item-link[aria-current="page"]::before { left: -0.75rem; }
  body.sidebar-collapsed .sidebar-collapse-btn { justify-content: center; }
}

@media (min-width: 1400px) {
  .app-content { padding-inline: 2.5rem; }
}

@media print {
  .sidebar, .app-header, .sidebar-backdrop, .app-footer { display: none !important; }
  .app-main { margin: 0 !important; }
}