/* ============================================================================
   Restaurant POS & Management System - Main Design System
   Pure Vanilla CSS3 - Touch Friendly, Modern SaaS & Toast/Square POS aesthetic
   ============================================================================ */

:root {
  --primary: #ea580c;
  --primary-hover: #c2410c;
  --primary-light: #ffedd5;
  --primary-dark: #9a3412;
  
  --secondary: #0f172a;
  --secondary-hover: #1e293b;
  
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-sidebar: #0f172a;
  --bg-sidebar-hover: #1e293b;
  --bg-sidebar-active: #ea580c;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-white: #ffffff;
  
  --border-color: #e2e8f0;
  --border-focus: #ea580c;
  
  --success: #16a34a;
  --success-light: #dcfce7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --warning: #d97706;
  --warning-light: #fef3c7;
  --info: #0284c7;
  --info-light: #e0f2fe;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --sidebar-width: 250px;
  --header-height: 64px;
}

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

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

/* Sidebar */
.app-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  color: var(--text-white);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.25s ease;
  z-index: 50;
}

.sidebar-header {
  height: var(--header-height);
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.sidebar-brand span.highlight {
  color: var(--primary);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-section-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  padding: 0.75rem 0.75rem 0.25rem;
  font-weight: 700;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  color: #cbd5e1;
  font-size: 0.925rem;
  font-weight: 500;
  transition: all 0.15s ease;
  min-height: 44px;
}

.nav-item:hover {
  background-color: var(--bg-sidebar-hover);
  color: var(--text-white);
}

.nav-item.active {
  background-color: var(--bg-sidebar-active);
  color: var(--text-white);
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(234, 88, 12, 0.35);
}

.nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.user-snippet {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  overflow: hidden;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary), #fb923c);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.user-details {
  overflow: hidden;
  line-height: 1.2;
}

.user-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: #f1f5f9;
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

.user-role {
  font-size: 0.725rem;
  color: #94a3b8;
  text-transform: capitalize;
}

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

/* Header */
.app-header {
  height: var(--header-height);
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

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

.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-main);
  border-radius: var(--radius-sm);
}

.header-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.restaurant-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  background-color: var(--primary-light);
  color: var(--primary-dark);
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 600;
}

/* Page Body */
.page-body {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
}

/* ----------------------------------------------------------------------------
   UI Elements & Components
   ---------------------------------------------------------------------------- */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.15rem;
  font-weight: 600;
  font-size: 0.925rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  min-height: 44px; /* Touch friendly */
  white-space: nowrap;
  user-select: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
}
.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn-secondary {
  background-color: #f1f5f9;
  color: var(--text-main);
  border-color: var(--border-color);
}
.btn-secondary:hover:not(:disabled) {
  background-color: #e2e8f0;
}

.btn-success {
  background-color: var(--success);
  color: white;
}
.btn-success:hover:not(:disabled) {
  background-color: #15803d;
}

.btn-danger {
  background-color: var(--danger);
  color: white;
}
.btn-danger:hover:not(:disabled) {
  background-color: #b91c1c;
}

.btn-outline {
  background-color: transparent;
  border-color: var(--border-color);
  color: var(--text-main);
}
.btn-outline:hover:not(:disabled) {
  background-color: #f8fafc;
  border-color: #cbd5e1;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.825rem;
  min-height: 36px;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.85rem 1.5rem;
  font-size: 1.05rem;
  min-height: 50px;
  border-radius: var(--radius-lg);
}

.btn-icon {
  padding: 0.5rem;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
}

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

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

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.card-body {
  padding: 1.5rem;
}

.card-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  background-color: #f8fafc;
}

/* KPI / Metric Cards */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.metric-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: var(--primary);
}

.metric-card.success::after { background-color: var(--success); }
.metric-card.warning::after { background-color: var(--warning); }
.metric-card.danger::after { background-color: var(--danger); }
.metric-card.info::after { background-color: var(--info); }

.metric-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.metric-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.metric-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.metric-sub {
  margin-top: 0.35rem;
  font-size: 0.8rem;
  color: var(--text-light);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-success { background-color: var(--success-light); color: var(--success); }
.badge-danger { background-color: var(--danger-light); color: var(--danger); }
.badge-warning { background-color: var(--warning-light); color: var(--warning); }
.badge-info { background-color: var(--info-light); color: var(--info); }
.badge-secondary { background-color: #e2e8f0; color: #475569; }

/* Status Dots */
.status-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  display: inline-block;
}
.status-dot.success { background-color: var(--success); }
.status-dot.danger { background-color: var(--danger); }
.status-dot.warning { background-color: var(--warning); }

/* Forms & Inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.375rem;
}

.form-control {
  width: 100%;
  padding: 0.65rem 0.95rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: #ffffff;
  color: var(--text-main);
  font-size: 0.925rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  min-height: 44px; /* Touch friendly */
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.15);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.form-help {
  font-size: 0.775rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

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

.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
}

.data-table th {
  background-color: #f8fafc;
  color: var(--text-muted);
  font-size: 0.775rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 0.95rem 1rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: var(--text-main);
  vertical-align: middle;
}

.data-table tr:hover td {
  background-color: #fcfcfd;
}

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

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(3px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 100;
}

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

.modal-dialog {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 580px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modalIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-dialog.modal-lg { max-width: 840px; }
.modal-dialog.modal-sm { max-width: 420px; }

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.96) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

.modal-close:hover {
  background-color: #f1f5f9;
  color: var(--text-main);
}

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

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  background-color: #f8fafc;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 200;
  max-width: 380px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background: white;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.15rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  animation: toastIn 0.25s ease;
  transition: all 0.2s ease;
}

.toast.toast-success { border-left: 4px solid var(--success); }
.toast.toast-error { border-left: 4px solid var(--danger); }
.toast.toast-warning { border-left: 4px solid var(--warning); }
.toast.toast-info { border-left: 4px solid var(--info); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Alert Banner */
.alert-banner {
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
}
.alert-warning { background-color: var(--warning-light); color: #92400e; border: 1px solid #fde68a; }
.alert-danger { background-color: var(--danger-light); color: #991b1b; border: 1px solid #fecaca; }
.alert-success { background-color: var(--success-light); color: #166534; border: 1px solid #bbf7d0; }

/* Empty States */
.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
}
.empty-state svg {
  width: 48px;
  height: 48px;
  stroke: var(--text-light);
  margin-bottom: 0.75rem;
}
.empty-state h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .app-sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    transform: translateX(-100%);
  }
  .app-sidebar.open {
    transform: translateX(0);
  }
  .mobile-nav-toggle {
    display: inline-flex;
  }
}

@media (max-width: 640px) {
  .page-body {
    padding: 1rem;
  }
  .metric-grid {
    grid-template-columns: 1fr;
  }
  .btn-lg {
    font-size: 0.95rem;
  }
}