/**
 * Layout System - Cursor-Inspired
 * Clean, modern flat layout with sidebar and header
 * Version: 1.0.0
 */

/* ============================================
   APP CONTAINER - Main Structure
   ============================================ */

.app-container {
  display: flex;
  min-height: 100vh;
  background: var(--bg-primary);
  background-image: var(--bg-primary-gradient);
  background-attachment: fixed;
}

/* ============================================
   SIDEBAR - Left Navigation
   ============================================ */

.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-default);
  display: flex;
  flex-direction: column;
  z-index: var(--z-fixed);
  transition: width var(--duration-medium) var(--ease-in-out);
}

.sidebar.collapsed {
  width: var(--sidebar-width-collapsed);
}

/* Sidebar Header - Logo & Branding */
.sidebar-header {
  height: var(--header-height);
  padding: 0 var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-bottom: 1px solid var(--border-default);
  flex-shrink: 0;
}

.sidebar-logo {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: var(--accent-purple-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
  flex-shrink: 0;
}

.sidebar-brand {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  opacity: 1;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.sidebar.collapsed .sidebar-brand {
  opacity: 0;
  width: 0;
}

/* Sidebar Navigation */
.sidebar-nav {
  flex: 1;
  padding: var(--space-4) 0;
  overflow-y: auto;
  overflow-x: hidden;
}

/* Nav Section Headers */
.nav-section-header {
  padding: var(--space-4) var(--space-4) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.sidebar.collapsed .nav-section-header {
  opacity: 0;
}

/* Nav Items */
.nav-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  margin: 0 var(--space-2);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  text-decoration: none;
  transition: var(--transition-colors), var(--transition-transform);
  cursor: pointer;
  border: none;
  background: transparent;
  width: calc(100% - var(--space-4));
}

.nav-item:hover {
  background: var(--surface-primary);
  color: var(--text-primary);
}

.nav-item.active {
  background: var(--surface-secondary);
  color: var(--text-primary);
}

/* Active indicator - purple left border */
.nav-item.active::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-2));
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--accent-purple);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* Nav Item Icons */
.nav-item-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.nav-item-icon svg {
  width: 100%;
  height: 100%;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Nav Item Labels */
.nav-item-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 1;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.sidebar.collapsed .nav-item-label {
  opacity: 0;
  width: 0;
}

/* Nav Item Badge */
.nav-item-badge {
  margin-left: auto;
  padding: 2px 6px;
  background: var(--accent-purple);
  color: white;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-full);
  line-height: 1;
  opacity: 1;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.sidebar.collapsed .nav-item-badge {
  opacity: 0;
  width: 0;
}

/* Sidebar Footer - Collapse Toggle */
.sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--border-default);
  flex-shrink: 0;
}

.sidebar-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-2);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-colors);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
}

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

.sidebar-toggle-icon {
  transition: transform var(--duration-medium) var(--ease-in-out);
}

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

/* ============================================
   MAIN CONTENT - Right Side
   ============================================ */

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-left var(--duration-medium) var(--ease-in-out);
}

.sidebar.collapsed ~ .main-content {
  margin-left: var(--sidebar-width-collapsed);
}

/* ============================================
   HEADER - Top Navigation
   ============================================ */

.header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: var(--header-bg);
  border-bottom: 1px solid var(--header-border);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-6);
  z-index: var(--z-sticky);
  backdrop-filter: var(--blur-lg);
  -webkit-backdrop-filter: var(--blur-lg);
}

/* Header Left - Breadcrumb */
.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex: 1;
}

.header-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.breadcrumb-item a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-colors);
}

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

.breadcrumb-item.active {
  color: var(--text-primary);
  font-weight: var(--weight-medium);
}

.breadcrumb-separator {
  color: var(--text-tertiary);
  font-size: var(--text-xs);
}

/* Header Center - Search */
.header-center {
  flex: 1;
  max-width: 480px;
  display: flex;
  align-items: center;
}

.header-search {
  position: relative;
  width: 100%;
}

.header-search-input {
  width: 100%;
  padding: var(--space-2) var(--space-4);
  padding-left: 36px;
  background: var(--surface-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-family: var(--font-primary);
  transition: var(--transition-colors);
}

.header-search-input:focus {
  outline: none;
  border-color: var(--accent-purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.header-search-input::placeholder {
  color: var(--text-tertiary);
}

.header-search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-tertiary);
  pointer-events: none;
}

/* Header Right - Actions */
.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Icon Buttons */
.icon-btn {
  position: relative;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-colors);
}

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

.icon-btn:active {
  transform: scale(0.95);
}

/* Icon Button Badge */
.icon-btn-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  background: var(--color-danger);
  border: 2px solid var(--header-bg);
  border-radius: var(--radius-full);
}

/* Status Indicator */
.status-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--surface-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-success);
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

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

.status-dot.warning {
  background: var(--color-warning);
}

.status-dot.danger {
  background: var(--color-danger);
}

/* ============================================
   PAGE CONTENT - Main Area
   ============================================ */

.page-content {
  flex: 1;
  padding: var(--content-padding);
  max-width: var(--content-max-width);
  margin: 0 auto;
  width: 100%;
}

.page-header {
  margin-bottom: var(--space-6);
}

.page-title {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.page-description {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* ============================================
   MOBILE RESPONSIVE
   ============================================ */

/* Tablet (< 1024px) */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }

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

  .main-content {
    margin-left: 0;
  }

  .header-center {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }
}

/* Mobile (< 768px) */
@media (max-width: 768px) {
  .header {
    padding: 0 var(--space-4);
  }

  .header-breadcrumb {
    display: none;
  }

  .page-content {
    padding: var(--space-4);
  }

  .page-title {
    font-size: var(--text-2xl);
  }

  .status-indicator {
    display: none;
  }
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-colors);
}

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

/* Sidebar Overlay (Mobile) */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: calc(var(--z-fixed) - 1);
  opacity: 0;
  transition: opacity var(--duration-medium) var(--ease-in-out);
}

@media (max-width: 1024px) {
  .sidebar-overlay.active {
    display: block;
    opacity: 1;
  }
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */

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

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

.sidebar-nav::-webkit-scrollbar-thumb {
  background: var(--surface-tertiary);
  border-radius: var(--radius-full);
}

.sidebar-nav::-webkit-scrollbar-thumb:hover {
  background: var(--surface-hover);
}