/* Modern Inventory Pro - Clean UI Design */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* CSS Variables */
:root {
  /* Colors */
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #dbeafe;
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --error: #ef4444;
  --error-light: #fee2e2;
  
  /* Grays */
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  /* Transitions */
  --transition: all 0.2s ease-in-out;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--gray-900);
  background-color: var(--gray-50);
  -webkit-font-smoothing: antialiased;
}

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

.sidebar {
  width: 280px;
  background: var(--white);
  border-right: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  z-index: 98;
}

.sidebar-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--gray-200);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.125rem;
}

.nav-menu {
  flex: 1;
  padding: var(--space-4) 0;
}

.nav-menu ul {
  list-style: none;
}

.nav-item {
  margin-bottom: var(--space-1);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-6);
  color: var(--gray-700);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  border-radius: 0;
}

.nav-link:hover {
  background-color: var(--gray-100);
  color: var(--primary);
}

.nav-link.active {
  background-color: var(--primary-light);
  color: var(--primary);
  border-right: 4px solid var(--primary);
  font-weight: 600;
}

.nav-icon {
  width: 20px;
  text-align: center;
}

.sidebar-footer {
  padding: var(--space-6);
  border-top: 1px solid var(--gray-200);
}

.main-content {
  flex: 1;
  margin-left: 280px;
  padding: var(--space-8);
  background-color: var(--gray-50);
  min-height: 100vh;
}

/* Page Header */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-8);
  gap: var(--space-4);
  flex-wrap: wrap;
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--gray-900);
  margin: 0;
  line-height: 1.2;
}

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

/* Search */
.search-container {
  position: relative;
  min-width: 280px;
}

.search-input {
  padding-left: 2.5rem !important;
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-500);
  pointer-events: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  min-height: 40px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--gray-700);
  border-color: var(--gray-300);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--gray-50);
  border-color: var(--gray-400);
}

.btn-success {
  background-color: var(--success);
  color: var(--white);
  border-color: var(--success);
}

.btn-danger {
  background-color: var(--error);
  color: var(--white);
  border-color: var(--error);
}

.btn-danger:hover:not(:disabled) {
  background-color: #dc2626;
  border-color: #dc2626;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-warning {
  background-color: var(--warning);
  color: var(--white);
  border-color: var(--warning);
}

/* Forms */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: 600;
  color: var(--gray-700);
  font-size: 0.875rem;
}

.form-input, .form-select, textarea.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-family: inherit;
  background-color: var(--white);
  transition: var(--transition);
  color: var(--gray-900);
}

.form-input:focus, .form-select:focus, textarea.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

textarea.form-input {
  resize: vertical;
  min-height: 80px;
}

.form-input::placeholder {
  color: var(--gray-400);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.75rem center;
  background-repeat: no-repeat;
  background-size: 1.25em 1.25em;
  padding-right: 2.5rem;
}

.form-select option {
  color: var(--gray-900);
  background-color: var(--white);
  padding: var(--space-2);
}

/* Fix for select styling */
select.form-input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.75rem center;
  background-repeat: no-repeat;
  background-size: 1.25em 1.25em;
  padding-right: 2.5rem;
  cursor: pointer;
}

select.form-input option {
  color: var(--gray-900);
  background-color: var(--white);
  padding: var(--space-2);
}

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--gray-200);
  background: var(--gray-50);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 0;
}

.card-body, .card-content {
  padding: var(--space-6);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.stat-card {
  background: var(--white);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}

.stat-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.stat-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-4);
}

.stat-title {
  color: var(--gray-600);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1;
}

/* Products Grid */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.product-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  transition: var(--transition);
}

.product-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.product-image {
  width: 100%;
  height: 160px;
  object-fit: cover;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  font-size: 2rem;
}

.product-info {
  padding: var(--space-4);
}

.product-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-2);
  line-height: 1.3;
}

.product-brand {
  color: var(--gray-500);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: var(--space-3);
  text-transform: uppercase;
}

.product-price {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: var(--space-3);
}

.product-stock {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.75rem;
  font-weight: 600;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
}

.stock-high { 
  background-color: var(--success-light);
  color: var(--success);
}

.stock-medium { 
  background-color: var(--warning-light);
  color: var(--warning);
}

.stock-low { 
  background-color: var(--error-light);
  color: var(--error);
}

.product-actions {
  padding: var(--space-3);
  border-top: 1px solid var(--gray-200);
  background: var(--gray-50);
  display: flex;
  gap: var(--space-2);
}

.product-actions .btn {
  flex: 1;
  font-size: 0.75rem;
  padding: var(--space-2) var(--space-3);
  min-height: 32px;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-4);
}

.modal-content {
  background: var(--white);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-6);
  border-bottom: 1px solid var(--gray-200);
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-400);
  padding: var(--space-2);
  border-radius: var(--radius);
  transition: var(--transition);
}

.modal-close:hover {
  background-color: var(--gray-100);
  color: var(--gray-600);
}

.modal-body {
  padding: var(--space-6);
}

.modal-footer {
  padding: var(--space-6);
  border-top: 1px solid var(--gray-200);
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
}

/* Image preview styling */
.image-preview {
  max-width: 120px;
  max-height: 120px;
  margin: 0 auto var(--space-4);
  border-radius: var(--radius);
  object-fit: cover;
  border: 2px solid var(--gray-200);
  display: none;
}

.image-preview.show {
  display: block;
}

/* File input styling */
input[type="file"].form-input {
  padding: var(--space-3);
  cursor: pointer;
}

input[type="file"].form-input::-webkit-file-upload-button {
  background: var(--primary);
  color: var(--white);
  border: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  margin-right: var(--space-3);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 600;
}

/* Hamburger Animation */
.hamburger {
  width: 20px;
  height: 16px;
  position: relative;
  cursor: pointer;
}

.hamburger span {
  display: block;
  position: absolute;
  height: 2px;
  width: 100%;
  background: var(--primary);
  border-radius: 2px;
  opacity: 1;
  left: 0;
  transform: rotate(0deg);
  transition: 0.25s ease-in-out;
}

.hamburger span:nth-child(1) {
  top: 0px;
}

.hamburger span:nth-child(2),
.hamburger span:nth-child(3) {
  top: 7px;
}

.hamburger span:nth-child(4) {
  top: 14px;
}

.hamburger.open span:nth-child(1) {
  top: 7px;
  width: 0%;
  left: 50%;
}

.hamburger.open span:nth-child(2) {
  transform: rotate(45deg);
}

.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg);
}

.hamburger.open span:nth-child(4) {
  top: 7px;
  width: 0%;
  left: 50%;
}

/* Utility Classes */
.hidden { display: none !important; }
.flex { display: flex; }
.grid { display: grid; }
.text-center { text-align: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

/* Receipt Styling */
.receipt-container {
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-lg);
  font-family: 'Courier New', monospace;
  max-width: 400px;
  margin: 0 auto var(--space-6);
}

.receipt-header {
  text-align: center;
  border-bottom: 2px dashed var(--gray-300);
  padding-bottom: var(--space-4);
  margin-bottom: var(--space-4);
}

.receipt-header h1 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: var(--space-2);
  letter-spacing: 2px;
}

.receipt-header p {
  font-size: 0.75rem;
  color: var(--gray-600);
  margin: var(--space-1) 0;
  line-height: 1.4;
}

.receipt-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  font-size: 0.75rem;
}

.receipt-info div {
  text-align: left;
}

.receipt-info p {
  margin: 0;
  color: var(--gray-600);
  font-weight: 600;
}

.receipt-info span {
  color: var(--gray-900);
  font-weight: 700;
}

.receipt-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-4);
  font-size: 0.75rem;
}

.receipt-table th {
  background: var(--gray-100);
  padding: var(--space-2);
  text-align: left;
  font-weight: 700;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-300);
}

.receipt-table td {
  padding: var(--space-2);
  border-bottom: 1px dotted var(--gray-200);
  color: var(--gray-800);
}

.receipt-table th:last-child,
.receipt-table td:last-child {
  text-align: right;
}

.receipt-total {
  border-top: 2px solid var(--gray-900);
  padding-top: var(--space-3);
  margin-bottom: var(--space-4);
  text-align: center;
}

.receipt-total p {
  font-size: 1rem;
  font-weight: 800;
  color: var(--gray-900);
  margin: 0;
  letter-spacing: 1px;
}

.receipt-footer {
  text-align: center;
  border-top: 2px dashed var(--gray-300);
  padding-top: var(--space-4);
  font-size: 0.75rem;
}

.receipt-footer p {
  margin: var(--space-1) 0;
  color: var(--gray-600);
}

.receipt-footer p:first-child {
  font-weight: 700;
  color: var(--primary);
  font-size: 0.875rem;
}

.receipt-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

.btn-print {
  background-color: var(--gray-800);
  color: var(--white);
  border-color: var(--gray-800);
}

.btn-print:hover {
  background-color: var(--gray-900);
  border-color: var(--gray-900);
}

.btn-whatsapp {
  background-color: #25d366;
  color: var(--white);
  border-color: #25d366;
}

.btn-whatsapp:hover {
  background-color: #128c7e;
  border-color: #128c7e;
}

.card-header.premium {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
}

.card-title.premium {
  color: var(--white);
}

@media print {
  .receipt-container {
    box-shadow: none;
    border: none;
    margin: 0;
    padding: var(--space-4);
  }
  
  .receipt-actions,
  .sidebar,
  .page-header,
  .card-header {
    display: none !important;
  }
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 98;
    top: 60px;
    height: calc(100vh - 60px);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
    padding: var(--space-4);
  }
  
  .page-header {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-4);
  }
  
  .header-actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }
  
  .search-container {
    min-width: auto;
    width: 100%;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  
  .products-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  
  .modal-content {
    margin: var(--space-4);
    max-width: calc(100vw - 2rem);
  }
  
  /* Dashboard mobile layout */
  .grid[style*="grid-template-columns: 2fr 1fr"] {
    grid-template-columns: 1fr !important;
    gap: var(--space-6);
  }
  
  /* Sales page mobile layout */
  .grid[style*="grid-template-columns: 1fr 400px"] {
    grid-template-columns: 1fr !important;
    gap: var(--space-4);
  }
  
  /* Card header mobile adjustments */
  .card-header {
    flex-direction: column;
    gap: var(--space-3);
  }
  
  .card-header .search-container {
    width: 100% !important;
  }
}