body {
  font-family: var(--font-family);
  background: var(--background);
  color: var(--text-primary);
  margin: 0;
}

/* ══════════════════════════════════════
   App shell – ChatGPT-style layout
   Sidebar | Content (header + main)
   ══════════════════════════════════════ */
.layout-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  height: 100vh;
  overflow: hidden;
  transition: grid-template-columns 0.25s ease;
}

html.sidebar-collapsed .layout-shell {
  grid-template-columns: 60px 1fr;
}

/* ── Sidebar ───────────────────────── */
.layout-sidebar {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border-right: 1px solid var(--border);
  height: 100vh;
  overflow: hidden;
  width: 260px;
  transition: width 0.25s ease, transform 0.25s ease, opacity 0.2s ease;
  flex-shrink: 0;
}

.sidebar-collapsed .layout-sidebar {
  width: 60px;
}

/* ── Compact: hide text, center icons ── */
.sidebar-collapsed .sidebar-brand span,
.sidebar-collapsed .sidebar-header-actions,
.sidebar-collapsed .nav-section-label,
.sidebar-collapsed .sidebar-user-name {
  display: none;
}

.sidebar-collapsed .sidebar-header {
  justify-content: center;
  padding: 14px 0;
}

.sidebar-collapsed .sidebar-brand {
  gap: 0;
  justify-content: center;
  cursor: pointer;
}

.sidebar-collapsed .sidebar-brand i {
  font-size: 1.4rem;
}

.sidebar-collapsed .sidebar-nav {
  padding: 4px 6px;
}

.sidebar-collapsed .sidebar-nav .nav-link {
  justify-content: center;
  padding: 10px 0;
  gap: 0;
}

.sidebar-collapsed .sidebar-nav .nav-link span {
  display: none;
}

.sidebar-collapsed .sidebar-nav .nav-link i {
  width: auto;
  font-size: 1.2rem;
}

.sidebar-collapsed .sidebar-footer {
  padding: 12px 6px;
}

.sidebar-collapsed .sidebar-user {
  justify-content: center;
  padding: 8px 0;
  gap: 0;
}

/* Compact tooltip on hover */
.sidebar-collapsed .sidebar-nav .nav-link {
  position: relative;
}

.sidebar-collapsed .sidebar-nav .nav-link::after {
  content: attr(title);
  position: absolute;
  left: calc(100% + 8px);
  top: 50%;
  transform: translateY(-50%);
  background: var(--text-primary);
  color: #fff;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
  z-index: 100;
}

.sidebar-collapsed .sidebar-nav .nav-link:hover::after {
  opacity: 1;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  flex-shrink: 0;
}

.sidebar-header-actions {
  display: flex;
  align-items: center;
  gap: 2px;
}

/* ── Sidebar toggle button ───────── */
.sidebar-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
}

.sidebar-toggle-btn:hover {
  background: var(--background);
  color: var(--text-primary);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.sidebar-brand i {
  font-size: 1.25rem;
  color: var(--primary);
}

.sidebar-brand:hover {
  color: var(--primary);
}

.sidebar-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.sidebar-action-btn:hover {
  background: var(--background);
  color: var(--primary);
}

/* ── Sidebar navigation ──────────── */
.sidebar-nav {
  flex: 1;
  overflow-x: hidden;
  overflow-y: auto;
  padding: 4px 8px;
}

.sidebar-nav .nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  font-size: 0.9rem;
  text-decoration: none;
  transition: var(--transition);
}

.sidebar-nav .nav-link i {
  font-size: 1.1rem;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.sidebar-nav .nav-link:hover {
  background: var(--background);
}

.sidebar-nav .nav-link.active {
  background: var(--background);
  color: var(--primary);
  font-weight: 600;
}

.sidebar-nav .nav-section-label {
  font-size: .7rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 16px 12px 4px;
  margin: 0;
}

/* ── Sidebar footer ──────────────── */
.sidebar-footer {
  flex-shrink: 0;
  padding: 12px 12px;
  border-top: 1px solid var(--border);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.sidebar-user:hover {
  background: var(--background);
}

.sidebar-user i {
  font-size: 1.3rem;
  color: var(--text-secondary);
}

.sidebar-user-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-guest-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* ══════════════════════════════════════
   Content area (header + main)
   ══════════════════════════════════════ */
.layout-content {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ── Main header bar (inside content) ─ */
.main-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
  min-height: 52px;
}

/* ── Mobile overlay ──────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 1040;
}

/* ── Breadcrumb ─────────────────── */
.main-header-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  min-width: 0;
  font-size: 0.88rem;
}

.breadcrumb-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  white-space: nowrap;
}

.breadcrumb-link:hover {
  color: var(--primary);
}

.breadcrumb-link .bi-house-door {
  font-size: 1.05rem;
}

.breadcrumb-sep {
  font-size: 0.6rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.main-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

/* ── Auth buttons (header) ───────── */
.header-btn-login {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

.header-btn-login:hover {
  background: color-mix(in srgb, var(--primary) 8%, transparent);
  color: var(--primary-dark);
}

.header-btn-register {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

.header-btn-register:hover {
  background: var(--primary-dark);
  color: #fff;
}

/* ── Language dropdown ───────────── */
.lang-dropdown {
  position: relative;
}

.lang-dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.lang-dropdown-toggle:hover {
  background: var(--background);
  color: var(--text-primary);
}

.lang-dropdown-toggle .bi-globe2 { font-size: 1rem; }

.lang-chevron {
  font-size: 0.6rem;
  transition: transform 0.2s ease;
}

.lang-dropdown.open .lang-chevron {
  transform: rotate(180deg);
}

.lang-dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 150px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 1060;
  overflow: hidden;
}

.lang-dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 14px;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
}

.lang-dropdown-item:hover {
  background: var(--background);
}

.lang-dropdown-item.active {
  color: var(--primary);
  font-weight: 600;
  background: color-mix(in srgb, var(--primary) 6%, transparent);
}

.main-header-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  position: relative;
}

.main-header-btn:hover {
  background: var(--background);
  color: var(--text-primary);
}

/* ── Main content area ─────────────── */
.layout-main {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
}

/* ── Toast notifications ──────────── */
.toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.toast {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  min-width: 260px;
  box-shadow: var(--shadow-sm);
}

.toast-success { border-color: var(--success); color: var(--success); }
.toast-error   { border-color: var(--danger);  color: var(--danger);  }
.toast-warning { border-color: var(--warning); color: #7A5F00;        }
.toast-info    { border-color: var(--info);    color: var(--info);    }

/* ── Responsive ───────────────────── */
@media (max-width: 992px) {
  .layout-shell {
    grid-template-columns: 1fr;
  }

  html.sidebar-collapsed .layout-shell {
    grid-template-columns: 1fr;
  }

  .layout-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1050;
    width: 280px;
    transform: translateX(-100%);
    opacity: 1;
    pointer-events: auto;
    box-shadow: var(--shadow-md);
  }

  .sidebar-collapsed .layout-sidebar {
    width: 280px;
  }

  .sidebar-collapsed .sidebar-brand span,
  .sidebar-collapsed .sidebar-header-actions,
  .sidebar-collapsed .nav-section-label,
  .sidebar-collapsed .sidebar-user-name { display: revert; }

  .sidebar-collapsed .sidebar-header { justify-content: space-between; padding: 14px 16px; }
  .sidebar-collapsed .sidebar-brand { gap: 8px; cursor: default; }
  .sidebar-collapsed .sidebar-brand i { font-size: 1.25rem; }
  .sidebar-collapsed .sidebar-nav { padding: 4px 8px; }
  .sidebar-collapsed .sidebar-nav .nav-link { justify-content: flex-start; padding: 10px 12px; gap: 10px; }
  .sidebar-collapsed .sidebar-nav .nav-link span { display: inline; }
  .sidebar-collapsed .sidebar-nav .nav-link::after { display: none; }
  .sidebar-collapsed .sidebar-footer { padding: 12px 12px; }
  .sidebar-collapsed .sidebar-user { justify-content: flex-start; padding: 8px 10px; gap: 10px; }

  .layout-shell.sidebar-mobile-open .layout-sidebar {
    transform: translateX(0);
  }

  .layout-shell.sidebar-mobile-open .sidebar-overlay {
    display: block;
  }

  .layout-content {
    height: 100vh;
  }
}