:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: rgba(30, 41, 59, 0.85);
  --bg-hover: rgba(51, 65, 85, 0.6);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: rgba(148, 163, 184, 0.15);
  --accent-primary: #3b82f6;
  --accent-hover: #2563eb;
  --accent-soft: rgba(59, 130, 246, 0.15);
  --success: #10b981;
  --success-soft: rgba(16, 185, 129, 0.15);
  --warning: #f59e0b;
  --warning-soft: rgba(245, 158, 11, 0.15);
  --danger: #ef4444;
  --danger-soft: rgba(239, 68, 68, 0.15);
  --purple: #8b5cf6;
  --purple-soft: rgba(139, 92, 246, 0.15);
  --cyan: #06b6d4;
  --cyan-soft: rgba(6, 182, 212, 0.15);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.35);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --sidebar-width: 260px;
}

[data-theme="light"] {
  --bg-primary: #f1f5f9;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e2e8f0;
  --bg-card: #ffffff;
  --bg-hover: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.15);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  overflow-x: hidden;
}

/* Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  transition: transform 0.25s ease;
}

.brand {
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  border-bottom: 1px solid var(--border-color);
}

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 1.15rem;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

.brand-text h1 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-text span {
  font-size: 0.72rem;
  color: var(--text-secondary);
  display: block;
}

.nav-section-label {
  padding: 1rem 1.5rem 0.4rem;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 600;
}

.nav-list {
  list-style: none;
  padding: 0 0.75rem;
  flex: 1;
  overflow-y: auto;
}

.nav-item {
  margin-bottom: 0.25rem;
}

.nav-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
  font-family: inherit;
}

.nav-btn-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-btn i {
  font-size: 1.05rem;
  width: 20px;
  text-align: center;
}

.nav-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.nav-btn.active {
  background: var(--accent-soft);
  color: var(--accent-primary);
  font-weight: 600;
}

.nav-badge {
  font-size: 0.72rem;
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
}

.nav-btn.active .nav-badge {
  background: var(--accent-primary);
  color: #fff;
}

.nav-badge.alert {
  background: var(--danger-soft);
  color: var(--danger);
}

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.auto-link-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.75rem;
  background: var(--success-soft);
  color: var(--success);
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.76rem;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
}

/* Main Area */
.main-wrapper {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* Topbar */
.topbar {
  height: 68px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.75rem;
  position: sticky;
  top: 0;
  z-index: 50;
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  cursor: pointer;
}

.global-search {
  position: relative;
  width: 320px;
}

.global-search i {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.global-search input {
  width: 100%;
  padding: 0.55rem 0.9rem 0.55rem 2.35rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
  transition: border-color 0.15s;
}

.global-search input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  font-family: inherit;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-success {
  background: var(--success);
  color: #fff;
}

.btn-success:hover {
  filter: brightness(1.08);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-hover);
}

.btn-danger {
  background: var(--danger-soft);
  color: var(--danger);
}

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
}

.btn-sm {
  padding: 0.35rem 0.65rem;
  font-size: 0.78rem;
}

.btn-icon {
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  cursor: pointer;
}

.btn-icon:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

/* Content Area */
.content-area {
  padding: 1.75rem;
  flex: 1;
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.page-title h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-title p {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-top: 0.2rem;
}

.page-actions {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
}

/* KPI Grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.15rem;
  margin-bottom: 1.5rem;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.kpi-card:hover {
  transform: translateY(-2px);
  border-color: rgba(59, 130, 246, 0.35);
}

.kpi-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.kpi-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.kpi-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
}

.kpi-icon.blue { background: var(--accent-soft); color: var(--accent-primary); }
.kpi-icon.green { background: var(--success-soft); color: var(--success); }
.kpi-icon.amber { background: var(--warning-soft); color: var(--warning); }
.kpi-icon.red { background: var(--danger-soft); color: var(--danger); }
.kpi-icon.purple { background: var(--purple-soft); color: var(--purple); }
.kpi-icon.cyan { background: var(--cyan-soft); color: var(--cyan); }

.kpi-value {
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.kpi-sub {
  font-size: 0.76rem;
  color: var(--text-secondary);
  margin-top: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* Cards & Panels */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.card-header {
  padding: 1.1rem 1.35rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-body {
  padding: 1.25rem 1.35rem;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 1rem 1.35rem;
  border-bottom: 1px solid var(--border-color);
  background: rgba(15, 23, 42, 0.2);
}

.filter-input,
.filter-select {
  padding: 0.5rem 0.8rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: inherit;
}

.filter-input {
  min-width: 220px;
}

.filter-input:focus,
.filter-select:focus {
  outline: none;
  border-color: var(--accent-primary);
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.data-table th {
  padding: 0.85rem 1.1rem;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  background: rgba(15, 23, 42, 0.25);
  white-space: nowrap;
}

.data-table td {
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.data-table tbody tr:hover {
  background: var(--bg-hover);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.22rem 0.6rem;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 600;
  white-space: nowrap;
}

.badge-success { background: var(--success-soft); color: var(--success); }
.badge-warning { background: var(--warning-soft); color: var(--warning); }
.badge-danger { background: var(--danger-soft); color: var(--danger); }
.badge-info { background: var(--accent-soft); color: var(--accent-primary); }
.badge-purple { background: var(--purple-soft); color: var(--purple); }
.badge-neutral { background: var(--bg-tertiary); color: var(--text-secondary); }

/* Dashboard Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.workflow-banner {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.14), rgba(139, 92, 246, 0.14));
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.35rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.workflow-steps {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
}

.workflow-pill {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
}

/* Visual Bar Chart */
.bar-chart {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.bar-row {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.bar-row-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
}

.bar-track {
  width: 100%;
  height: 10px;
  background: var(--bg-primary);
  border-radius: 999px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 999px;
  transition: width 0.4s ease;
}

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.72);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 1rem;
}

.modal-backdrop.open {
  display: flex;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 680px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.18s ease-out;
}

.modal.modal-lg {
  max-width: 860px;
}

@keyframes modalIn {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
  padding: 1.15rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
}

.modal-body {
  padding: 1.35rem 1.5rem;
  overflow-y: auto;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.65rem;
}

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group.full {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-control {
  padding: 0.6rem 0.8rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-family: inherit;
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
}

/* Line Items Builder */
.line-items-box {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.9rem;
  background: rgba(15, 23, 42, 0.25);
}

.line-item-row {
  display: grid;
  grid-template-columns: 2.5fr 1fr 1.2fr 1.2fr auto;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.55rem;
}

.line-item-header {
  font-size: 0.73rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.4rem;
}

/* Toast Notification */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.toast {
  background: var(--bg-secondary);
  border-left: 4px solid var(--accent-primary);
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 280px;
  animation: modalIn 0.2s ease;
}

.toast.success { border-left-color: var(--success); }
.toast.warning { border-left-color: var(--warning); }
.toast.danger { border-left-color: var(--danger); }

/* Printable Document */
.invoice-sheet {
  background: #ffffff;
  color: #0f172a;
  padding: 2rem;
  border-radius: var(--radius-md);
}

.invoice-sheet table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
}

.invoice-sheet th,
.invoice-sheet td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid #e2e8f0;
  text-align: left;
  font-size: 0.85rem;
}

.invoice-sheet th {
  background: #f8fafc;
  color: #475569;
  font-weight: 600;
}

.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 992px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-wrapper {
    margin-left: 0;
  }
  .mobile-menu-btn {
    display: block;
  }
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
  .line-item-row {
    grid-template-columns: 1fr 1fr;
  }
  .global-search {
    width: 180px;
  }
}

@media print {
  body * {
    visibility: hidden;
  }
  #printableArea, #printableArea * {
    visibility: visible;
  }
  #printableArea {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    background: #fff !important;
    color: #000 !important;
    padding: 0;
  }
}