* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

.app-wrapper {
  display: flex;
  min-height: 100vh;
  width: 100%;
  max-width: 100%;
  position: relative;
}

/* Sidebar */
.app-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 50;
  transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1), transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-brand {
  height: var(--header-height);
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.025em;
  color: #fff;
  transition: padding 0.25s ease, justify-content 0.25s ease;
}

.sidebar-brand svg {
  color: var(--primary);
  flex-shrink: 0;
}

.sidebar-nav {
  flex: 1;
  padding: 1rem 0.65rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.nav-category {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dark);
  padding: 0.75rem 0.75rem 0.25rem;
  transition: opacity 0.2s ease;
}

/* Collapsible Nav Group Accordion */
.nav-group {
  display: flex;
  flex-direction: column;
  margin-top: 0.25rem;
}

.nav-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: transparent;
  background-color: transparent;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 0.6rem 0.75rem 0.35rem;
  color: var(--text-dark);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: color 0.15s ease;
  user-select: none;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  font-family: inherit;
  box-shadow: none;
}

.nav-group-header:hover {
  color: var(--text-secondary);
}

.nav-group-title {
  pointer-events: none;
}

.nav-group-chevron {
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 0.7;
  flex-shrink: 0;
  pointer-events: none;
}

.nav-group.is-collapsed .nav-group-chevron {
  transform: rotate(-90deg);
}

.nav-group.is-expanded .nav-group-chevron {
  transform: rotate(0deg);
}

.nav-group-items {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  overflow: hidden;
  transition: max-height 0.25s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s ease;
}

.nav-group.is-collapsed .nav-group-items {
  max-height: 0;
  opacity: 0;
  pointer-events: none;
  display: none;
}

.nav-group.is-expanded .nav-group-items {
  max-height: 500px;
  opacity: 1;
  pointer-events: auto;
  display: flex;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.84375rem;
  font-weight: 500;
  transition: background-color 0.15s ease, color 0.15s ease, padding 0.25s ease;
  position: relative;
}

.nav-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.nav-item.active {
  background-color: var(--primary-light);
  color: #60a5fa;
  font-weight: 600;
}

.nav-item svg {
  width: 1.2rem;
  height: 1.2rem;
  flex-shrink: 0;
  opacity: 0.8;
}

.nav-item.active svg {
  opacity: 1;
  color: var(--primary);
}

.sidebar-footer {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sidebar-toggle-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
  padding: 0;
  flex-shrink: 0;
}

.sidebar-toggle-btn:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: var(--primary);
}

.collapse-icon {
  transition: transform 0.25s ease;
}

/* Main Container Base */
.app-container {
  flex: 1;
  min-width: 0;
  width: calc(100% - var(--sidebar-width));
  max-width: calc(100% - var(--sidebar-width));
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              max-width 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              margin-left 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  box-sizing: border-box;
}

/* ========================================================================= */
/* COLLAPSED SIDEBAR (DESKTOP ICON-ONLY RAIL) */
/* ========================================================================= */
html.sidebar-collapsed .app-sidebar,
body.sidebar-collapsed .app-sidebar {
  width: var(--sidebar-collapsed-width, 68px);
}

html.sidebar-collapsed .app-container,
body.sidebar-collapsed .app-container {
  width: calc(100% - var(--sidebar-collapsed-width, 68px));
  max-width: calc(100% - var(--sidebar-collapsed-width, 68px));
  margin-left: var(--sidebar-collapsed-width, 68px);
}

body.sidebar-collapsed .sidebar-brand {
  padding: 0;
  justify-content: center;
}

body.sidebar-collapsed .sidebar-brand .brand-text {
  display: none;
}

body.sidebar-collapsed .nav-category,
body.sidebar-collapsed .nav-group-header {
  display: none;
}

body.sidebar-collapsed .nav-group.is-collapsed .nav-group-items,
body.sidebar-collapsed .nav-group.is-expanded .nav-group-items {
  display: flex !important;
  max-height: none !important;
  opacity: 1 !important;
  pointer-events: auto !important;
}

body.sidebar-collapsed .nav-item {
  justify-content: center;
  padding: 0.65rem 0;
  gap: 0;
}

body.sidebar-collapsed .nav-item .nav-label {
  display: none;
}

body.sidebar-collapsed .sidebar-footer {
  justify-content: center;
  padding: 0.75rem 0.25rem;
}

body.sidebar-collapsed .sidebar-footer .footer-info {
  display: none;
}

body.sidebar-collapsed .collapse-icon {
  transform: rotate(180deg);
}

/* Custom Tooltip on Hover in Collapsed Mode */
body.sidebar-collapsed .nav-item:hover::after {
  content: attr(title);
  position: absolute;
  left: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%);
  background: #0f172a;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
  z-index: 100;
  pointer-events: none;
  animation: fadeInTooltip 0.15s ease-out;
}

@keyframes fadeInTooltip {
  from { opacity: 0; transform: translateY(-50%) translateX(-4px); }
  to { opacity: 1; transform: translateY(-50%) translateX(0); }
}

/* Header / Topbar */
.app-header {
  height: var(--header-height);
  background-color: var(--bg-header);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  padding: 0 1.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
}

.mobile-toggle:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.header-title-group {
  display: flex;
  flex-direction: column;
}

.page-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.2;
}

.breadcrumb {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.system-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  color: #34d399;
}

.pulse-dot {
  width: 0.5rem;
  height: 0.5rem;
  background-color: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Main Content Area */
.app-main {
  flex: 1;
  padding: 1.75rem;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
}

/* Footer */
.app-footer {
  padding: 1.25rem 1.75rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.8125rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-surface);
}

/* Mobile Responsive */
@media (max-width: 992px) {
  .app-sidebar,
  html.sidebar-collapsed .app-sidebar,
  body.sidebar-collapsed .app-sidebar {
    width: var(--sidebar-width);
    transform: translateX(-100%);
  }
  .app-sidebar.open,
  html.sidebar-collapsed .app-sidebar.open,
  body.sidebar-collapsed .app-sidebar.open {
    transform: translateX(0);
  }
  .app-container,
  html.sidebar-collapsed .app-container,
  body.sidebar-collapsed .app-container {
    width: 100%;
    max-width: 100%;
    margin-left: 0;
  }
  body.sidebar-collapsed .sidebar-brand {
    justify-content: flex-start;
    padding: 0 1.25rem;
  }
  body.sidebar-collapsed .sidebar-brand .brand-text,
  body.sidebar-collapsed .nav-category,
  body.sidebar-collapsed .nav-item .nav-label,
  body.sidebar-collapsed .sidebar-footer .footer-info {
    display: inline-block;
  }
  body.sidebar-collapsed .nav-item {
    justify-content: flex-start;
    padding: 0.55rem 0.75rem;
    gap: 0.75rem;
  }
  body.sidebar-collapsed .nav-item:hover::after {
    display: none;
  }
  body.sidebar-collapsed .sidebar-footer {
    justify-content: space-between;
    padding: 0.75rem 1rem;
  }
  .sidebar-toggle-btn {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 45;
  }
  .sidebar-overlay.active {
    display: block;
  }
}

@media (max-width: 768px) {
  .app-main {
    padding: 1rem 0.75rem;
  }
  .app-header {
    padding: 0.65rem 0.85rem;
    height: auto;
    min-height: var(--header-height);
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .header-left {
    gap: 0.5rem;
  }
  .page-title {
    font-size: 1rem;
  }
  .header-right {
    gap: 0.5rem;
  }
  .app-footer {
    padding: 1rem 0.75rem;
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .app-main {
    padding: 0.75rem 0.5rem;
  }
  .breadcrumb {
    font-size: 0.7rem;
  }
  .system-pill {
    padding: 0.25rem 0.5rem;
    font-size: 0.7rem;
  }
}