/* ============================================================
   OSA-BOS — Premium Enterprise Admin Dashboard
   Design System: Dark / Light Mode | Bootstrap 5 Base
   ============================================================ */

/* ── CSS Variables ── */
:root {
  /* Surface Colors */
  --osa-bg: #0b0f19;
  --osa-surface: #111827;
  --osa-surface-raised: #1f2937;
  --osa-surface-hover: #374151;
  --osa-border: #374151;
  --osa-border-subtle: #1f2937;

  /* Text Colors */
  --osa-text: #f3f4f6;
  --osa-text-secondary: #9ca3af;
  --osa-text-muted: #6b7280;
  --osa-text-inverse: #111827;

  /* Accent / Primary */
  --osa-primary: #3b82f6;
  --osa-primary-hover: #2563eb;
  --osa-primary-glow: rgba(59, 130, 246, 0.25);
  --osa-primary-light: #60a5fa;

  /* Semantic */
  --osa-success: #10b981;
  --osa-success-bg: rgba(16, 185, 129, 0.1);
  --osa-warning: #f59e0b;
  --osa-warning-bg: rgba(245, 158, 11, 0.1);
  --osa-danger: #ef4444;
  --osa-danger-bg: rgba(239, 68, 68, 0.1);
  --osa-info: #06b6d4;
  --osa-info-bg: rgba(6, 182, 212, 0.1);

  /* Gradients */
  --osa-gradient-primary: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --osa-gradient-success: linear-gradient(135deg, #10b981, #06b6d4);
  --osa-gradient-warning: linear-gradient(135deg, #f59e0b, #ef4444);
  --osa-gradient-card: linear-gradient(180deg, rgba(59,130,246,0.08) 0%, transparent 100%);

  /* Shadows */
  --osa-shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --osa-shadow: 0 4px 12px rgba(0,0,0,0.4);
  --osa-shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
  --osa-shadow-glow: 0 0 20px var(--osa-primary-glow);

  /* Spacing & Shape */
  --osa-radius-sm: 6px;
  --osa-radius: 10px;
  --osa-radius-lg: 16px;
  --osa-sidebar-width: 260px;
  --osa-sidebar-collapsed: 72px;
  --osa-header-height: 64px;

  /* Typography */
  --osa-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --osa-font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --osa-transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Light Mode Override ── */
[data-theme="light"] {
  --osa-bg: #f8fafc;
  --osa-surface: #ffffff;
  --osa-surface-raised: #f1f5f9;
  --osa-surface-hover: #e2e8f0;
  --osa-border: #e2e8f0;
  --osa-border-subtle: #f1f5f9;
  --osa-text: #0f172a;
  --osa-text-secondary: #64748b;
  --osa-text-muted: #94a3b8;
  --osa-text-inverse: #f8fafc;
  --osa-shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --osa-shadow: 0 4px 12px rgba(0,0,0,0.08);
  --osa-shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
}

/* ── Base ── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--osa-font-sans);
  background: var(--osa-bg);
  color: var(--osa-text);
  margin: 0;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background var(--osa-transition), color var(--osa-transition);
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--osa-surface-hover); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--osa-text-muted); }

/* ── Links ── */
a { color: var(--osa-primary-light); text-decoration: none; transition: color var(--osa-transition); }
a:hover { color: var(--osa-primary); }

/* ── Bootstrap Overrides ── */
.btn { border-radius: var(--osa-radius-sm); font-weight: 500; transition: all var(--osa-transition); border: none; }
.btn-primary {
  background: var(--osa-gradient-primary);
  border: none;
  box-shadow: 0 4px 14px rgba(59,130,246,0.35);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(59,130,246,0.45); }
.btn-outline-primary { border: 1px solid var(--osa-primary); color: var(--osa-primary); background: transparent; }
.btn-outline-primary:hover { background: var(--osa-primary); color: #fff; }
.btn-success { background: var(--osa-success); }
.btn-danger { background: var(--osa-danger); }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }

.form-control, .form-select {
  background: var(--osa-surface-raised);
  border: 1px solid var(--osa-border);
  color: var(--osa-text);
  border-radius: var(--osa-radius-sm);
  transition: all var(--osa-transition);
}
.form-control:focus, .form-select:focus {
  background: var(--osa-surface-raised);
  border-color: var(--osa-primary);
  color: var(--osa-text);
  box-shadow: 0 0 0 3px var(--osa-primary-glow);
}
.form-control::placeholder { color: var(--osa-text-muted); }
.form-label { color: var(--osa-text-secondary); font-weight: 500; font-size: 0.85rem; margin-bottom: 0.35rem; }

.table {
  --bs-table-bg: transparent;
  --bs-table-color: var(--osa-text);
  --bs-table-border-color: var(--osa-border-subtle);
  --bs-table-striped-bg: rgba(255,255,255,0.02);
  --bs-table-hover-bg: rgba(59,130,246,0.05);
}
.table thead th {
  background: var(--osa-surface-raised);
  color: var(--osa-text-secondary);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--osa-border);
  padding: 0.85rem 1rem;
}
.table tbody td { padding: 0.85rem 1rem; vertical-align: middle; border-bottom: 1px solid var(--osa-border-subtle); }
.table tbody tr:hover td { color: var(--osa-text); }

.dropdown-menu {
  background: var(--osa-surface-raised);
  border: 1px solid var(--osa-border);
  border-radius: var(--osa-radius);
  box-shadow: var(--osa-shadow-lg);
}
.dropdown-item { color: var(--osa-text-secondary); transition: all var(--osa-transition); }
.dropdown-item:hover { background: var(--osa-surface-hover); color: var(--osa-text); }
.dropdown-divider { border-color: var(--osa-border); }

.modal-content {
  background: var(--osa-surface);
  border: 1px solid var(--osa-border);
  border-radius: var(--osa-radius-lg);
  box-shadow: var(--osa-shadow-lg);
}
.modal-header, .modal-footer { border-color: var(--osa-border-subtle); }
.modal-title { color: var(--osa-text); }

.badge {
  font-weight: 500;
  font-size: 0.7rem;
  padding: 0.35em 0.65em;
  border-radius: 6px;
}
.badge.bg-success { background: var(--osa-success-bg) !important; color: var(--osa-success) !important; }
.badge.bg-danger { background: var(--osa-danger-bg) !important; color: var(--osa-danger) !important; }
.badge.bg-warning { background: var(--osa-warning-bg) !important; color: var(--osa-warning) !important; }
.badge.bg-info { background: var(--osa-info-bg) !important; color: var(--osa-info) !important; }
.badge.bg-primary { background: rgba(59,130,246,0.15) !important; color: var(--osa-primary-light) !important; }
.badge.bg-secondary { background: var(--osa-surface-hover) !important; color: var(--osa-text-secondary) !important; }

.pagination .page-link {
  background: var(--osa-surface-raised);
  border-color: var(--osa-border);
  color: var(--osa-text-secondary);
}
.pagination .page-link:hover { background: var(--osa-surface-hover); color: var(--osa-text); border-color: var(--osa-border); }
.pagination .page-item.active .page-link { background: var(--osa-primary); border-color: var(--osa-primary); color: #fff; }

/* ── Card Component ── */
.osa-card {
  background: var(--osa-surface);
  border: 1px solid var(--osa-border-subtle);
  border-radius: var(--osa-radius-lg);
  box-shadow: var(--osa-shadow-sm);
  transition: all var(--osa-transition);
  overflow: hidden;
}
.osa-card:hover { box-shadow: var(--osa-shadow); border-color: var(--osa-border); }
.osa-card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--osa-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.osa-card-header h5, .osa-card-header h6 { margin: 0; font-weight: 600; }
.osa-card-body { padding: 1.5rem; }
.osa-card-gradient {
  background: var(--osa-gradient-card);
  border-top: 3px solid var(--osa-primary);
}

/* ── Stat Card ── */
.osa-stat-card {
  background: var(--osa-surface);
  border: 1px solid var(--osa-border-subtle);
  border-radius: var(--osa-radius-lg);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  transition: all var(--osa-transition);
}
.osa-stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--osa-gradient-primary);
  opacity: 0.7;
}
.osa-stat-card:hover { transform: translateY(-3px); box-shadow: var(--osa-shadow); }
.osa-stat-icon {
  width: 44px; height: 44px;
  border-radius: var(--osa-radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}
.osa-stat-icon.blue { background: rgba(59,130,246,0.12); color: var(--osa-primary-light); }
.osa-stat-icon.green { background: var(--osa-success-bg); color: var(--osa-success); }
.osa-stat-icon.orange { background: var(--osa-warning-bg); color: var(--osa-warning); }
.osa-stat-icon.red { background: var(--osa-danger-bg); color: var(--osa-danger); }
.osa-stat-icon.purple { background: rgba(139,92,246,0.12); color: #a78bfa; }
.osa-stat-icon.cyan { background: var(--osa-info-bg); color: var(--osa-info); }
.osa-stat-value { font-size: 1.75rem; font-weight: 700; color: var(--osa-text); margin-bottom: 0.25rem; }
.osa-stat-label { font-size: 0.8rem; color: var(--osa-text-secondary); text-transform: uppercase; letter-spacing: 0.05em; }
.osa-stat-change { font-size: 0.75rem; margin-top: 0.5rem; font-weight: 500; }
.osa-stat-change.up { color: var(--osa-success); }
.osa-stat-change.down { color: var(--osa-danger); }

/* ── Sidebar ── */
.osa-sidebar {
  width: var(--osa-sidebar-width);
  background: var(--osa-surface);
  border-right: 1px solid var(--osa-border-subtle);
  height: 100vh;
  position: fixed;
  left: 0; top: 0;
  display: flex;
  flex-direction: column;
  z-index: 1040;
  transition: width var(--osa-transition);
}
.osa-sidebar.collapsed { width: var(--osa-sidebar-collapsed); }
.osa-sidebar-brand {
  height: var(--osa-header-height);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--osa-border-subtle);
  gap: 0.75rem;
}
.osa-sidebar-brand .logo-icon {
  width: 36px; height: 36px;
  border-radius: var(--osa-radius-sm);
  background: var(--osa-gradient-primary);
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}
.osa-sidebar-brand .logo-text {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--osa-text);
  letter-spacing: -0.02em;
}
.osa-sidebar-brand .logo-text small {
  display: block;
  font-size: 0.65rem;
  color: var(--osa-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
  margin-top: -2px;
}
.osa-sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 0.75rem;
}
.osa-sidebar-nav::-webkit-scrollbar { width: 4px; }
.osa-sidebar-nav::-webkit-scrollbar-thumb { background: transparent; }
.osa-sidebar-nav:hover::-webkit-scrollbar-thumb { background: var(--osa-surface-hover); }
.osa-nav-section {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--osa-text-muted);
  padding: 0.75rem 1rem 0.5rem;
  font-weight: 600;
}
.osa-nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  border-radius: var(--osa-radius-sm);
  color: var(--osa-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--osa-transition);
  cursor: pointer;
  margin-bottom: 2px;
  text-decoration: none;
}
.osa-nav-item:hover { background: var(--osa-surface-hover); color: var(--osa-text); }
.osa-nav-item.active { background: rgba(59,130,246,0.1); color: var(--osa-primary-light); }
.osa-nav-item.active .nav-icon { color: var(--osa-primary); }
.osa-nav-item .nav-icon { font-size: 1.1rem; width: 22px; text-align: center; flex-shrink: 0; }
.osa-nav-item .nav-chevron { margin-left: auto; font-size: 0.75rem; transition: transform var(--osa-transition); }
.osa-nav-item.collapsed .nav-text, .osa-nav-item.collapsed .nav-chevron, .osa-sidebar.collapsed .osa-nav-section,
.osa-sidebar.collapsed .logo-text, .osa-sidebar.collapsed .sidebar-footer-text { display: none; }
.osa-sidebar.collapsed .osa-nav-item { justify-content: center; padding: 0.65rem; }
.osa-sidebar.collapsed .osa-nav-item .nav-icon { width: auto; }
.osa-sidebar-footer {
  padding: 0.75rem;
  border-top: 1px solid var(--osa-border-subtle);
}

/* ── Header ── */
.osa-header {
  height: var(--osa-header-height);
  background: var(--osa-surface);
  border-bottom: 1px solid var(--osa-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 1030;
}
.osa-header-left, .osa-header-right { display: flex; align-items: center; gap: 0.75rem; }
.osa-search-wrap {
  position: relative;
  width: 320px;
}
.osa-search-wrap .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--osa-text-muted);
  font-size: 0.9rem;
}
.osa-search-wrap input {
  padding-left: 38px;
  background: var(--osa-surface-raised);
  border: 1px solid var(--osa-border);
  border-radius: var(--osa-radius);
  height: 40px;
  font-size: 0.875rem;
}
.osa-header-btn {
  width: 40px; height: 40px;
  border-radius: var(--osa-radius-sm);
  background: var(--osa-surface-raised);
  border: 1px solid var(--osa-border);
  color: var(--osa-text-secondary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all var(--osa-transition);
  position: relative;
}
.osa-header-btn:hover { background: var(--osa-surface-hover); color: var(--osa-text); }
.osa-header-btn .badge-dot {
  position: absolute;
  top: 6px; right: 6px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--osa-danger);
  border: 2px solid var(--osa-surface-raised);
}
.osa-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--osa-gradient-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
}

/* ── Main Layout ── */
.osa-main {
  margin-left: var(--osa-sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: margin-left var(--osa-transition);
}
.osa-sidebar.collapsed ~ .osa-main { margin-left: var(--osa-sidebar-collapsed); }
.osa-content { flex: 1; padding: 1.5rem; }

/* ── Page Header ── */
.osa-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}
.osa-page-header h1 { font-size: 1.5rem; font-weight: 700; margin: 0; letter-spacing: -0.02em; }
.osa-page-header .breadcrumb { font-size: 0.8rem; color: var(--osa-text-muted); margin-bottom: 0.25rem; }

/* ── Filter Bar ── */
.osa-filter-bar {
  background: var(--osa-surface);
  border: 1px solid var(--osa-border-subtle);
  border-radius: var(--osa-radius);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

/* ── Table Actions ── */
.osa-table-actions { display: flex; align-items: center; gap: 0.5rem; }

/* ── Data Table Wrapper ── */
.osa-table-wrap { background: var(--osa-surface); border: 1px solid var(--osa-border-subtle); border-radius: var(--osa-radius-lg); overflow: hidden; }
.osa-table-wrap .table { margin: 0; }
.osa-table-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--osa-border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--osa-text-muted);
}

/* ── Toast Notifications ── */
.osa-toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}
.osa-toast {
  background: var(--osa-surface-raised);
  border: 1px solid var(--osa-border);
  border-radius: var(--osa-radius);
  padding: 0.875rem 1.25rem;
  box-shadow: var(--osa-shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 300px;
  max-width: 400px;
  pointer-events: all;
  animation: toastIn 0.3s ease;
  border-left: 4px solid var(--osa-primary);
}
.osa-toast.success { border-left-color: var(--osa-success); }
.osa-toast.error { border-left-color: var(--osa-danger); }
.osa-toast.warning { border-left-color: var(--osa-warning); }
.osa-toast.info { border-left-color: var(--osa-info); }
.osa-toast-icon { font-size: 1.1rem; flex-shrink: 0; }
.osa-toast.success .osa-toast-icon { color: var(--osa-success); }
.osa-toast.error .osa-toast-icon { color: var(--osa-danger); }
.osa-toast.warning .osa-toast-icon { color: var(--osa-warning); }
.osa-toast.info .osa-toast-icon { color: var(--osa-info); }
.osa-toast-body { flex: 1; }
.osa-toast-title { font-weight: 600; font-size: 0.9rem; margin-bottom: 0.15rem; }
.osa-toast-msg { font-size: 0.8rem; color: var(--osa-text-secondary); }
.osa-toast-close { background: none; border: none; color: var(--osa-text-muted); cursor: pointer; font-size: 1rem; padding: 0; line-height: 1; }
.osa-toast-close:hover { color: var(--osa-text); }
@keyframes toastIn {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(30px); }
}
.osa-toast.hiding { animation: toastOut 0.3s ease forwards; }

/* ── Loader / Skeleton ── */
.osa-loader-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11,15,25,0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9998;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--osa-transition);
}
.osa-loader-overlay.active { opacity: 1; pointer-events: all; }
.osa-spinner {
  width: 48px; height: 48px;
  border: 3px solid var(--osa-border);
  border-top-color: var(--osa-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.osa-skeleton {
  background: linear-gradient(90deg, var(--osa-surface-raised) 25%, var(--osa-surface-hover) 50%, var(--osa-surface-raised) 75%);
  background-size: 200% 100%;
  animation: skeleton 1.5s ease infinite;
  border-radius: var(--osa-radius-sm);
}
@keyframes skeleton {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.osa-skeleton-text { height: 12px; margin-bottom: 8px; }
.osa-skeleton-title { height: 20px; width: 60%; margin-bottom: 12px; }
.osa-skeleton-avatar { width: 36px; height: 36px; border-radius: 50%; }

/* ── Login Page ── */
.osa-login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--osa-bg);
  padding: 2rem;
}
.osa-login-card {
  width: 100%;
  max-width: 420px;
  background: var(--osa-surface);
  border: 1px solid var(--osa-border-subtle);
  border-radius: var(--osa-radius-lg);
  padding: 2.5rem;
  box-shadow: var(--osa-shadow-lg);
}
.osa-login-logo {
  width: 56px; height: 56px;
  border-radius: var(--osa-radius);
  background: var(--osa-gradient-primary);
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto 1.5rem;
}
.osa-login-card h2 { text-align: center; font-weight: 700; margin-bottom: 0.5rem; }
.osa-login-card p { text-align: center; color: var(--osa-text-secondary); font-size: 0.9rem; margin-bottom: 2rem; }

/* ── Empty State ── */
.osa-empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--osa-text-muted);
}
.osa-empty-state .empty-icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.5; }
.osa-empty-state h5 { color: var(--osa-text-secondary); margin-bottom: 0.5rem; }

/* ── Chart Container ── */
.osa-chart-container { position: relative; height: 300px; }

/* ── Responsive ── */
@media (max-width: 991.98px) {
  .osa-sidebar { transform: translateX(-100%); }
  .osa-sidebar.open { transform: translateX(0); }
  .osa-main { margin-left: 0; }
  .osa-sidebar.collapsed ~ .osa-main { margin-left: 0; }
  .osa-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 1035;
    opacity: 0; pointer-events: none; transition: opacity var(--osa-transition);
  }
  .osa-overlay.active { opacity: 1; pointer-events: all; }
}

/* ── Print ── */
@media print {
  .osa-sidebar, .osa-header, .osa-header-btn, .osa-table-actions, .osa-filter-bar { display: none !important; }
  .osa-main { margin-left: 0 !important; }
}