/* ============================================
   AUHMS - App Shell Layout
   ============================================ */

/* ---- Main App Grid ---- */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--header-height) 1fr;
  grid-template-areas:
    "sidebar header"
    "sidebar content";
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

.app.sidebar-collapsed {
  grid-template-columns: var(--sidebar-collapsed-width) 1fr;
}

/* ---- Sidebar ---- */
.sidebar {
  grid-area: sidebar;
  background: var(--bg-sidebar);
  color: var(--gray-300);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: var(--z-sidebar);
  transition: width var(--transition-slow);
  border-right: 1px solid rgba(255,255,255,0.06);
}

.sidebar-brand {
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 var(--space-5);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
  gap: var(--space-3);
}

.sidebar-brand-logo {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #3B82F6 50%, var(--color-success) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}

.sidebar-brand-logo::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255,255,255,0.9);
  border-radius: 2px;
}

.sidebar-brand-text {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-brand-name {
  font-size: var(--text-base);
  font-weight: var(--font-bold);
  color: #FFFFFF;
  letter-spacing: var(--tracking-wide);
  white-space: nowrap;
}

.sidebar-brand-sub {
  font-size: var(--text-xs);
  color: var(--gray-500);
  font-weight: var(--font-medium);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  white-space: nowrap;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-3) 0;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
}

.sidebar-nav::-webkit-scrollbar {
  width: 4px;
}

.sidebar-nav::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-nav::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.1);
  border-radius: var(--radius-full);
}

.sidebar-section {
  margin-bottom: var(--space-2);
}

.sidebar-section-title {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--gray-500);
  padding: var(--space-3) var(--space-5) var(--space-2);
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-3);
  margin: 1px 0;
}

.sidebar-item > a,
.sidebar-item > button {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--gray-400);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  position: relative;
}

.sidebar-item > a:hover,
.sidebar-item > button:hover {
  background: rgba(255,255,255,0.06);
  color: var(--gray-200);
}

.sidebar-item.active > a,
.sidebar-item.active > button {
  background: rgba(37, 99, 235, 0.15);
  color: var(--color-primary-light);
}

.sidebar-item.active > a::before,
.sidebar-item.active > button::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--color-primary);
  border-radius: 0 2px 2px 0;
}

.sidebar-item-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  opacity: 0.7;
}

.sidebar-item.active .sidebar-item-icon {
  opacity: 1;
}

.sidebar-item-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-item-badge {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: rgba(239, 68, 68, 0.2);
  color: var(--color-danger-light);
  flex-shrink: 0;
}

.sidebar-item-chevron {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
  opacity: 0.4;
}

.sidebar-item.expanded .sidebar-item-chevron {
  transform: rotate(90deg);
}

.sidebar-submenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.sidebar-submenu.open {
  max-height: 500px;
}

.sidebar-submenu-item {
  padding: 0 var(--space-3);
}

.sidebar-submenu-item > a {
  display: block;
  padding: var(--space-1) var(--space-3) var(--space-1) 44px;
  font-size: var(--text-sm);
  color: var(--gray-500);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-decoration: none;
  position: relative;
}

.sidebar-submenu-item > a::before {
  content: '';
  position: absolute;
  left: 28px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--gray-600);
  transition: background var(--transition-fast);
}

.sidebar-submenu-item > a:hover {
  color: var(--gray-300);
  background: rgba(255,255,255,0.04);
}

.sidebar-submenu-item > a:hover::before {
  background: var(--gray-400);
}

.sidebar-submenu-item.active > a {
  color: var(--color-primary-light);
}

.sidebar-submenu-item.active > a::before {
  background: var(--color-primary-light);
}

.sidebar-footer {
  flex-shrink: 0;
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid rgba(255,255,255,0.06);
}

.sidebar-footer-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-2);
  border-radius: var(--radius-md);
  color: var(--gray-500);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.sidebar-footer-item:hover {
  color: var(--gray-300);
  background: rgba(255,255,255,0.06);
}

.sidebar-status-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-success);
  flex-shrink: 0;
  box-shadow: 0 0 6px rgba(16, 185, 129, 0.4);
}

/* ---- Header ---- */
.header {
  grid-area: header;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  gap: var(--space-4);
  z-index: var(--z-sticky);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex: 1;
  min-width: 0;
}

.header-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--gray-500);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.header-toggle:hover {
  background: var(--gray-100);
  color: var(--gray-700);
}

.header-page-info {
  display: flex;
  flex-direction: column;
  gap: 0;
  min-width: 0;
}

.header-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--gray-400);
}

.header-breadcrumb a {
  color: var(--gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.header-breadcrumb-sep {
  color: var(--gray-300);
  font-size: 10px;
}

.header-title {
  font-size: var(--text-md);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: var(--leading-snug);
}

.header-search {
  position: relative;
  max-width: 400px;
  flex-shrink: 1;
  flex-grow: 0;
}

.header-search-input {
  width: 280px;
  height: 36px;
  padding: 0 var(--space-4) 0 36px;
  background: var(--gray-50);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.header-search-input:focus {
  background: var(--bg-input-focus);
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
  width: 340px;
}

.header-search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--gray-400);
  pointer-events: none;
}

.header-search-kbd {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--text-xs);
  font-family: var(--font-sans);
  color: var(--gray-400);
  background: var(--gray-100);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--gray-200);
  font-weight: var(--font-medium);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.header-action {
  position: relative;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--gray-500);
  transition: all var(--transition-fast);
}

.header-action:hover {
  background: var(--gray-100);
  color: var(--gray-700);
}

.header-action-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-danger);
  border: 2px solid var(--bg-header);
}

.header-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-success-bg);
  border: 1px solid var(--color-success-subtle);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-success-hover);
}

.header-status-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-success);
  animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.header-divider {
  width: 1px;
  height: 28px;
  background: var(--border-default);
  margin: 0 var(--space-2);
}

.header-profile {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.header-profile:hover {
  background: var(--gray-50);
}

.header-profile-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  flex-shrink: 0;
}

.header-profile-info {
  display: flex;
  flex-direction: column;
}

.header-profile-name {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  line-height: 1.2;
}

.header-profile-role {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  line-height: 1.2;
}

/* ---- Main Content ---- */
.content {
  grid-area: content;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-app);
  padding: var(--content-padding);
}

.content-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* ---- Page Header ---- */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  gap: var(--space-4);
}

.page-header-left {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
}

.page-subtitle {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.page-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ---- Grid Layouts ---- */
.grid {
  display: grid;
  gap: var(--space-5);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

.grid-auto-fill {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.grid-auto-fit {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ---- Two-Column Layout with Sidebar Rail ---- */
.layout-with-rail {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: var(--space-5);
}

.layout-main { min-width: 0; }
.layout-rail { min-width: 0; }

/* ---- Mobile Overlay ---- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: calc(var(--z-sidebar) - 1);
}

/* ---- Responsive ---- */
@media (max-width: 1280px) {
  .grid-4 { grid-template-columns: repeat(3, 1fr); }
  .grid-5 { grid-template-columns: repeat(3, 1fr); }
  .layout-with-rail {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1024px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "content";
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    transform: translateX(-100%);
    transition: transform var(--transition-drawer);
  }

  .app.sidebar-open .sidebar {
    transform: translateX(0);
  }

  .app.sidebar-open .sidebar-overlay {
    display: block;
  }

  .header-search-input {
    width: 200px;
  }

  .header-search-input:focus {
    width: 240px;
  }

  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .content {
    padding: var(--space-4);
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-search { display: none; }
  .header-profile-info { display: none; }
  .header-status { display: none; }
}

@media (max-width: 480px) {
  .content {
    padding: var(--space-3);
  }

  .header {
    padding: 0 var(--space-3);
  }
}