/* ============================================
   Layout — App Shell, Sidebar, Topbar, Content
   ============================================ */

/* App Shell */
.app-shell {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  background: linear-gradient(180deg, var(--slate-900) 0%, #0c1527 100%);
  color: var(--slate-300);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: var(--z-sidebar);
  transition: width var(--transition-normal);
  overflow-y: auto;
  overflow-x: hidden;
}

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

.sidebar-header {
  padding: var(--space-5) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-bottom: 1px solid var(--slate-800);
  min-height: var(--topbar-height);
  flex-shrink: 0;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.sidebar-logo svg { flex-shrink: 0; }

.sidebar-logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--white);
  white-space: nowrap;
}

.collapsed .sidebar-logo-text { display: none; }

.sidebar-toggle {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--slate-400);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}
.sidebar-toggle:hover { color: var(--white); }
.collapsed .sidebar-toggle { margin: 0 auto; }

/* Sidebar Navigation */
.sidebar-nav {
  flex: 1;
  padding: var(--space-3) 0;
  overflow-y: auto;
}

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

.sidebar-section-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--slate-500);
  padding: var(--space-2) var(--space-5);
  white-space: nowrap;
}

.collapsed .sidebar-section-label {
  text-align: center;
  padding: var(--space-2) var(--space-1);
  font-size: 0;
}
.collapsed .sidebar-section-label::after {
  content: '—';
  font-size: var(--text-xs);
  color: var(--slate-600);
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-5);
  color: var(--slate-400);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
  white-space: nowrap;
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
}

.sidebar-item:hover {
  color: var(--white);
  background: rgba(255,255,255,0.05);
}

.sidebar-item.active {
  color: var(--white);
  background: linear-gradient(90deg, rgba(30, 58, 138, 0.4), rgba(30, 58, 138, 0.15));
  border-left-color: var(--navy-400);
}

.sidebar-item i { flex-shrink: 0; width: 20px; height: 20px; }

.sidebar-item-text { flex: 1; }
.collapsed .sidebar-item-text { display: none; }
.collapsed .sidebar-item { justify-content: center; padding: var(--space-2) 0; border-left: none; }

.sidebar-item .sidebar-badge {
  font-size: var(--text-xs);
  font-weight: 700;
  background: var(--amber-700);
  color: var(--white);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  min-width: 20px;
  text-align: center;
}
.collapsed .sidebar-badge { display: none; }

/* Sidebar Footer */
.sidebar-footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--slate-800);
  flex-shrink: 0;
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}
.sidebar-user:hover { background: rgba(255,255,255,0.05); }

.sidebar-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--navy-700);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 600;
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.sidebar-user-info { overflow: hidden; }
.collapsed .sidebar-user-info { display: none; }

.sidebar-user-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-role {
  font-size: var(--text-xs);
  color: var(--slate-500);
}

/* Main Area */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* Top Bar */
.topbar {
  height: var(--topbar-height);
  background: var(--white);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  gap: var(--space-4);
  flex-shrink: 0;
  z-index: var(--z-topbar);
  box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}

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

.topbar-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--slate-500);
}
.topbar-breadcrumb span { color: var(--slate-900); font-weight: 600; }

.topbar-search {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--slate-100);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--slate-400);
  font-size: var(--text-sm);
  min-width: 220px;
}
.topbar-search:hover { background: var(--slate-200); }
.topbar-search kbd {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  background: var(--white);
  padding: 1px 5px;
  border-radius: 4px;
  border: 1px solid var(--slate-300);
  margin-left: auto;
}

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

.topbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: none;
  background: none;
  color: var(--slate-500);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}
.topbar-btn:hover { background: var(--slate-100); color: var(--slate-900); }

.topbar-btn .notification-dot {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 8px;
  height: 8px;
  background: var(--error-500);
  border-radius: 50%;
  border: 2px solid var(--white);
}

/* Timer in topbar */
.topbar-timer {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--navy-50);
  border: 1px solid var(--navy-200);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--navy-800);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.topbar-timer:hover { background: var(--navy-100); }
.topbar-timer.running {
  background: var(--success-50);
  border-color: var(--success-500);
  color: var(--success-700);
}
.topbar-timer.running .timer-dot {
  width: 8px; height: 8px;
  background: var(--success-500);
  border-radius: 50%;
  animation: pulse 1.5s ease-in-out infinite;
}

/* Dark mode toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: none;
  background: none;
  color: var(--slate-500);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.theme-toggle:hover { background: var(--slate-100); color: var(--slate-900); }

/* Content Area */
.content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-6);
  background: linear-gradient(135deg, var(--slate-50) 0%, #f0f4f8 50%, var(--slate-50) 100%);
}

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

.page-title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 600;
}

.page-subtitle {
  font-size: var(--text-sm);
  color: var(--slate-500);
  margin-top: var(--space-1);
}

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

/* AI Panel */
.ai-panel {
  width: 0;
  height: 100vh;
  background: var(--white);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width var(--transition-slow);
  flex-shrink: 0;
}
.ai-panel.open {
  width: 380px;
}

/* Search Overlay */
.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: var(--z-search);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 15vh;
  backdrop-filter: blur(4px);
}

.search-dialog {
  width: 100%;
  max-width: 640px;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  animation: scaleIn 0.15s ease-out;
}

/* Auth Screen */
.auth-screen {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--slate-900) 0%, var(--navy-900) 50%, var(--slate-800) 100%);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  box-shadow: var(--shadow-xl);
  animation: fadeInUp 0.5s ease-out;
}

.auth-logo {
  text-align: center;
  margin-bottom: var(--space-8);
}

.auth-logo h1 {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  color: var(--navy-900);
  margin-top: var(--space-3);
}

.auth-logo p {
  color: var(--slate-500);
  font-size: var(--text-sm);
}