/* ==========================================================================
   css/layout.css - App Shell, Topbar, Sidebar, Page Headers, Footer, Help Widget
   ========================================================================== */

/* Overall Page Shell */
.app-shell {
  display: flex;
  min-height: 100vh;
  background-color: var(--page-bg);
}

.public-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Fixed Topbar (Section 3.1) */
.app-topbar {
  position: fixed;
  top: 0;
  inset-inline-start: 0;
  inset-inline-end: 0;
  height: var(--topbar-height);
  background-color: var(--topbar-bg);
  border-bottom: 1px solid var(--topbar-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  z-index: 1000;
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--topbar-text);
  font-weight: 700;
  font-size: 1.125rem;
  min-width: 220px;
}

.topbar-brand:hover {
  text-decoration: none;
  color: var(--brand-primary);
}

.topbar-brand img {
  height: 32px;
  width: auto;
}

.topbar-center {
  flex: 1;
  max-width: 480px;
  margin: 0 1.5rem;
}

.global-search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.global-search-input {
  width: 100%;
  height: 38px;
  padding: 0 2.5rem 0 2.25rem;
  background-color: var(--page-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  font-size: 0.875rem;
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.global-search-input:focus {
  background-color: #FFFFFF;
  border-color: var(--brand-primary);
  outline: none;
  box-shadow: 0 0 0 2px rgba(49, 106, 255, 0.2);
}

.search-icon-hint {
  position: absolute;
  inset-inline-start: 0.75rem;
  color: var(--text-muted);
  pointer-events: none;
}

.search-key-hint {
  position: absolute;
  inset-inline-end: 0.75rem;
  background: var(--card-border);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 4px;
  pointer-events: none;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.topbar-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--topbar-text);
  width: 38px;
  height: 38px;
  border-radius: var(--btn-radius);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: all 0.15s ease;
}

.topbar-btn:hover {
  background-color: var(--page-bg);
  color: var(--brand-primary);
}

.topbar-badge {
  position: absolute;
  top: 4px;
  inset-inline-end: 4px;
  background-color: var(--danger);
  color: #FFFFFF;
  font-size: 0.625rem;
  font-weight: 700;
  min-width: 16px;
  height: 16px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 3px;
}

/* Role Switcher Dropdown in Topbar */
.role-dropdown-wrapper {
  position: relative;
}

.role-dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  padding: 0 0.75rem;
  height: 36px;
  border-radius: var(--btn-radius);
  border: 1px solid var(--card-border);
  background: var(--page-bg);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.role-dropdown-toggle:hover {
  background: #FFFFFF;
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

.role-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.5rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  min-width: 220px;
  z-index: 1020;
  padding: 0.5rem 0;
}

.role-dropdown-menu.show {
  display: block;
}

.role-dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  color: var(--text-primary);
  text-decoration: none;
}

.role-dropdown-item:hover {
  background-color: rgba(49, 106, 255, 0.08);
  color: var(--brand-primary);
  text-decoration: none;
}

.role-dropdown-divider {
  height: 1px;
  background: var(--card-border);
  margin: 0.375rem 0;
}

/* User Profile Menu */
.topbar-user {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 4px 8px;
  border-radius: var(--btn-radius);
  text-decoration: none;
  color: var(--topbar-text);
  cursor: pointer;
}

.topbar-user:hover {
  background-color: var(--page-bg);
  text-decoration: none;
}

.topbar-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: #EAF1FF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--brand-primary);
  overflow: hidden;
}

.topbar-user-info {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.topbar-user-name {
  font-size: 0.875rem;
  font-weight: 600;
}

.topbar-user-role {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Fixed Sidebar (Section 3.2) */
.app-sidebar {
  position: fixed;
  top: var(--topbar-height);
  bottom: 0;
  inset-inline-start: 0;
  width: var(--sidebar-width);
  background-color: var(--sidebar-bg);
  border-inline-end: 1px solid var(--sidebar-border);
  overflow-y: auto;
  padding: 1rem 0;
  z-index: 990;
  transition: transform 0.25s ease-in-out;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 0 0.75rem;
}

.nav-group-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  padding: 0.25rem 0.75rem;
  margin-bottom: 0.25rem;
}

.nav-item-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--btn-radius);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  height: 40px;
  text-decoration: none;
  transition: all 0.15s ease;
}

.nav-link:hover {
  background-color: rgba(49, 106, 255, 0.08);
  color: var(--brand-primary);
  text-decoration: none;
}

.nav-link.active {
  background-color: var(--sidebar-active-bg) !important;
  color: var(--sidebar-active-text) !important;
  font-weight: 600;
}

.nav-link.active .nav-icon {
  color: #FFFFFF !important;
}

.nav-icon {
  width: 20px;
  height: 20px;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* App Main Content Area */
.app-content {
  margin-top: var(--topbar-height);
  margin-inline-start: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - var(--topbar-height));
  transition: margin-inline-start 0.25s ease-in-out;
}

.public-content {
  margin-top: var(--topbar-height);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.main-container {
  flex: 1;
  padding: 1.5rem;
  max-width: 100%;
}

/* Page Header (Section 3.5) */
.page-header {
  margin-bottom: 1.5rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  padding-inline-end: 0.5rem;
  color: var(--card-border);
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}

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

.page-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.page-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* App Footer (Section 3.4) */
.app-footer {
  background-color: var(--card-bg);
  border-top: 1px solid var(--card-border);
  padding: var(--footer-padding);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: auto;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--brand-primary);
  text-decoration: underline;
}

/* Help Widget (Section 3.6 & 15.1) */
.help-widget-trigger {
  position: fixed;
  bottom: 1.5rem;
  inset-inline-end: 1.5rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--brand-primary);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(49, 106, 255, 0.35);
  cursor: pointer;
  z-index: 998;
  border: none;
  transition: transform 0.2s ease;
}

.help-widget-trigger:hover {
  transform: scale(1.08);
}

.help-panel {
  display: none;
  position: fixed;
  bottom: 5rem;
  inset-inline-end: 1.5rem;
  width: 320px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  z-index: 999;
  overflow: hidden;
}

.help-panel.open {
  display: block;
}

.help-panel-header {
  padding: 1rem;
  background: var(--brand-primary);
  color: #FFFFFF;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
}

.help-panel-body {
  padding: 1rem;
  font-size: 0.875rem;
}

/* Sidebar Backdrop on Mobile */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 980;
}

/* ==========================================================================
   Public Header & Navigation
   ========================================================================== */
.public-topbar {
  position: fixed;
  top: 0;
  inset-inline-start: 0;
  inset-inline-end: 0;
  height: 68px;
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.public-navbar-container {
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.public-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
}

.public-brand:hover {
  text-decoration: none;
  color: var(--brand-primary);
}

.public-brand-logo {
  height: 34px;
  width: auto;
}

.public-nav-list {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

@media (max-width: 860px) {
  .public-nav-list {
    display: none !important;
  }
}

.public-nav-item {
  margin: 0;
}

.public-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  border-radius: 6px;
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.15s ease-in-out;
}

.public-nav-link:hover {
  color: var(--brand-primary);
  background-color: rgba(49, 106, 255, 0.08);
  text-decoration: none;
}

.public-nav-link.active {
  color: var(--brand-primary);
  background-color: rgba(49, 106, 255, 0.12);
  font-weight: 600;
}

.public-topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.public-content-wrapper {
  margin-top: 68px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.public-main-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem 1.5rem;
  width: 100%;
  box-sizing: border-box;
}

/* ==========================================================================
   Responsive Adaptations & Zero Horizontal Overflow (Section 20)
   ========================================================================== */
@media (max-width: 991.98px) {
  .app-sidebar {
    transform: translateX(-100%);
    box-shadow: 4px 0 24px rgba(8, 32, 56, 0.2);
    z-index: 1050;
  }
  .app-sidebar.sidebar-open {
    transform: translateX(0);
  }
  .app-content {
    margin-inline-start: 0 !important;
    width: 100% !important;
    max-width: 100% !important;
  }
  .topbar-center {
    display: none !important;
  }
  .topbar-user-info {
    display: none !important;
  }
  .topbar-brand {
    min-width: auto !important;
    font-size: 1rem;
  }
}

@media (max-width: 575.98px) {
  .topbar {
    padding: 0 0.5rem;
  }
  .topbar-brand span {
    font-size: 0.875rem;
  }
  .topbar-brand img {
    height: 26px;
  }
  .topbar-right {
    gap: 0.25rem;
  }
  .btn-branch-switcher,
  .topbar-btn[data-action="fullscreen"],
  .topbar-btn[data-action="theme"] {
    display: none !important;
  }
  .main-container {
    padding: 0.75rem 0.5rem;
    box-sizing: border-box;
    overflow-x: hidden;
  }
  .public-main-container {
    padding: 1rem 0.5rem 2rem 0.5rem;
    box-sizing: border-box;
    overflow-x: hidden;
  }
  .page-header-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}