:root {
  /* Colors */
  --color-primary: #10B981;
  --color-primary-dark: #059669;
  --color-primary-light: #34d399;
  --color-bg: #0f172a;
  --color-card: #1e293b;
  --color-card-hover: #334155;
  --color-text: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-danger: #ef4444;
  --color-warning: #f59e0b;
  --color-info: #3b82f6;
  --color-border: rgba(255, 255, 255, 0.1);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Font */
  --font-main: 'Inter', sans-serif;
  
  /* Shadows */
  --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 15px rgba(16, 185, 129, 0.3);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  outline: none;
}

input, select, textarea {
  font-family: inherit;
  outline: none;
}

select {
  cursor: pointer;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px !important;
}

select option {
  background-color: #1e293b;
  color: #f8fafc;
  padding: 8px;
}

select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}

/* Glassmorphism utility */
.glass {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  font-weight: 600;
}

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-danger { color: var(--color-danger); }
.text-success { color: var(--color-primary); }
.text-warning { color: var(--color-warning); }

/* Layouts */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background-color: var(--color-card);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  z-index: 100;
}

.sidebar-header {
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.sidebar-logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 1px;
}

.sidebar-nav {
  padding: var(--space-md) 0;
  flex-grow: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  color: var(--color-text-secondary);
  transition: all 0.2s ease;
  gap: var(--space-sm);
  border-left: 3px solid transparent;
}

.nav-item:hover, .nav-item.active {
  color: var(--color-primary);
  background-color: rgba(16, 185, 129, 0.1);
  border-left-color: var(--color-primary);
}

.sidebar-footer {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Main Content */
.main-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) var(--space-xl);
  background-color: rgba(30, 41, 59, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.content-wrapper {
  padding: var(--space-xl);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

/* Login Page */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, var(--color-card) 0%, var(--color-bg) 100%);
}

.login-card {
  width: 100%;
  max-width: 400px;
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  text-align: center;
  animation: slideUp 0.5s ease-out;
}

.login-card h1 {
  margin-bottom: var(--space-xs);
  font-size: 2rem;
}

.login-card p {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-lg);
  text-align: left;
}

.form-label {
  display: block;
  margin-bottom: var(--space-xs);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: all 0.2s ease;
  gap: var(--space-sm);
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  box-shadow: var(--shadow-glow);
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

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

.btn-block {
  width: 100%;
}

/* KPI Cards */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-md);
}

.kpi-card {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  animation: fadeIn 0.5s ease-out;
}

.kpi-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.kpi-value {
  font-size: 1.75rem;
  font-weight: 700;
}

.kpi-change {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.kpi-change.up {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--color-primary);
}

.kpi-change.down {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-danger);
}

/* Filter Bar */
.filter-bar {
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Charts */
.chart-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.chart-card {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  min-height: 350px;
  display: flex;
  flex-direction: column;
}

.chart-card h3 {
  margin-bottom: var(--space-md);
  font-size: 1.125rem;
}

.chart-container {
  flex-grow: 1;
  position: relative;
}

/* Tables */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--color-text-secondary);
  font-weight: 500;
  white-space: nowrap;
}

tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

tr:last-child td {
  border-bottom: none;
}

/* Badges */
.badge {
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
}

.badge-primary { background: rgba(16, 185, 129, 0.1); color: var(--color-primary); border: 1px solid rgba(16,185,129,0.2); }
.badge-warning { background: rgba(245, 158, 11, 0.1); color: var(--color-warning); border: 1px solid rgba(245,158,11,0.2); }

/* Animations */
@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Toasts */
.toast-container {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  z-index: 1000;
}

.toast {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-sm);
  background-color: var(--color-card);
  border-left: 4px solid var(--color-primary);
  box-shadow: var(--shadow-card);
  animation: slideUp 0.3s ease-out;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

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

/* Responsive */
@media (max-width: 1024px) {
  .chart-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .menu-toggle {
    display: block;
  }
  .filter-row {
    flex-direction: column;
    align-items: flex-start;
  }
  .content-wrapper {
    padding: var(--space-md);
  }
}

.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 90;
  backdrop-filter: blur(2px);
}

.mobile-overlay.active {
  display: block;
}

.hamburger {
  display: none;
  background: none;
  color: var(--color-text);
  font-size: 1.5rem;
}

@media (max-width: 768px) {
  .hamburger {
    display: block;
  }
}

/* POS specific */
.pos-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-xl);
}

@media (max-width: 1024px) {
  .pos-layout {
    grid-template-columns: 1fr;
  }
}

.product-row {
  display: grid;
  grid-template-columns: 3fr 1fr 1fr 1fr auto;
  gap: var(--space-sm);
  align-items: center;
  margin-bottom: var(--space-sm);
}

@media (max-width: 640px) {
  .product-row {
    grid-template-columns: 1fr;
    border: 1px solid var(--color-border);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
  }
}

/* Loading Spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.skeleton {
  background: linear-gradient(90deg, var(--color-card) 25%, var(--color-card-hover) 50%, var(--color-card) 75%);
  background-size: 200% 100%;
  animation: skeletonLoading 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeletonLoading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Admin Tabs */
.tabs {
  display: flex;
  gap: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
  overflow-x: auto;
}

.tab {
  padding: var(--space-md) var(--space-lg);
  cursor: pointer;
  color: var(--color-text-secondary);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.tab:hover {
  color: var(--color-text);
}

.tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.modal-overlay.active .modal-card {
  transform: translateY(0);
}

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

.modal-body {
  padding: var(--space-lg);
}

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

.close-btn {
  background: none;
  color: var(--color-text-secondary);
  font-size: 1.5rem;
}
.close-btn:hover {
  color: var(--color-text);
}