/**
 * Inventory Management System - Complete CSS
 * Professional styling for frontend
 */

/* ============= CSS VARIABLES & RESET ============= */

:root {
  --primary-color: #3498db;
  --secondary-color: #2ecc71;
  --danger-color: #e74c3c;
  --warning-color: #f39c12;
  --dark-color: #2c3e50;
  --light-color: #ecf0f1;
  --border-color: #bdc3c7;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s ease;
}

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

html, body {
  height: 100%;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  color: var(--dark-color);
  line-height: 1.6;
}

/* ============= CONTAINER ============= */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ============= NAVBAR ============= */

.navbar {
  background: linear-gradient(135deg, var(--dark-color) 0%, var(--primary-color) 100%);
  color: white;
  padding: 1.5rem 0;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.8rem;
  font-weight: bold;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  border-bottom-color: var(--secondary-color);
}

/* ============= SECTIONS ============= */

.section {
  display: none;
  padding: 2rem 0;
  animation: fadeIn 0.3s ease;
}

.section.active-section {
  display: block;
}

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

.section-header {
  margin-bottom: 2rem;
  text-align: center;
}

.section-header h2 {
  font-size: 2rem;
  color: var(--dark-color);
  margin-bottom: 0.5rem;
}

.section-header p {
  color: #7f8c8d;
  font-size: 1.1rem;
}

/* ============= CARDS ============= */

.card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

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

.card h3 {
  color: var(--dark-color);
  margin-bottom: 1.5rem;
  font-size: 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ============= FORMS ============= */

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

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

.form-group label {
  font-weight: 600;
  color: var(--dark-color);
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.input-field {
  padding: 0.75rem 1rem;
  border: 2px solid var(--light-color);
  border-radius: 8px;
  font-size: 1rem;
  transition: var(--transition);
  font-family: inherit;
}

.input-field:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.input-field:invalid {
  border-color: var(--danger-color);
}

.form-group small {
  color: #7f8c8d;
  font-size: 0.85rem;
  margin-top: 0.3rem;
}

/* ============= BUTTONS ============= */

.button-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.btn {
  padding: 0.8rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), #2980b9);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: #95a5a6;
  color: white;
}

.btn-secondary:hover {
  background: #7f8c8d;
  transform: translateY(-2px);
}

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

.btn-danger:hover {
  background: #c0392b;
  transform: translateY(-2px);
}

.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

.full-width {
  width: 100%;
}

.btn-icon {
  font-size: 1.2rem;
}

/* ============= SEARCH SPECIFIC ============= */

.search-card {
  padding: 2rem;
}

.filter-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.badge {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  padding: 0.4rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
  animation: slideIn 0.2s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============= LOADING SPINNER ============= */

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  gap: 1rem;
}

.loading-spinner.hidden {
  display: none;
}

.spinner {
  border: 4px solid var(--light-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

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

/* ============= RESULTS ============= */

.results-container {
  margin-top: 2rem;
}

.results-summary {
  background: #d5f4e6;
  border-left: 4px solid var(--secondary-color);
  padding: 1rem;
  margin-bottom: 1rem;
  border-radius: 4px;
  color: #27ae60;
}

.no-results {
  background: #fadbd8;
  border: 2px dashed var(--danger-color);
  padding: 3rem;
  text-align: center;
  border-radius: 8px;
  color: #c0392b;
}

.table-wrapper {
  overflow-x: auto;
  box-shadow: var(--shadow);
  border-radius: 8px;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
}

.results-table thead {
  background: linear-gradient(135deg, var(--primary-color), #2980b9);
  color: white;
}

.results-table th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
}

.results-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--light-color);
}

.results-table tbody tr:hover {
  background: #f8f9fa;
}

.category-badge {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.85rem;
}

/* ============= TABS ============= */

.tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--light-color);
  flex-wrap: wrap;
}

.tab-btn {
  background: none;
  border: none;
  padding: 1rem 1.5rem;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: #7f8c8d;
  border-bottom: 3px solid transparent;
  transition: var(--transition);
}

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

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

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

/* ============= LISTS ============= */

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
}

.list-container {
  max-height: 500px;
  overflow-y: auto;
}

.items-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.list-item {
  background: #f8f9fa;
  border: 1px solid var(--light-color);
  border-radius: 8px;
  padding: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.list-item:hover {
  background: white;
  box-shadow: var(--shadow);
}

.item-content h4 {
  color: var(--dark-color);
  margin-bottom: 0.5rem;
}

.item-content p {
  margin: 0.3rem 0;
  color: #7f8c8d;
  font-size: 0.95rem;
}

.item-content small {
  color: #95a5a6;
}

.empty-state {
  text-align: center;
  color: #95a5a6;
  padding: 2rem;
  font-style: italic;
}

/* ============= ANALYTICS ============= */

.analytics-container {
  margin-top: 1rem;
}

.analytics-table-wrapper {
  overflow-x: auto;
}

.analytics-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
}

.analytics-table thead {
  background: var(--secondary-color);
  color: white;
}

.analytics-table th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
}

.analytics-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--light-color);
}

.analytics-table tbody tr:hover {
  background: #f0f8f5;
}

.analytics-table .grand-total {
  background: #d5f4e6;
  font-weight: bold;
  color: #27ae60;
}

/* ============= TOAST NOTIFICATIONS ============= */

.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 1rem 1.5rem;
  background: var(--secondary-color);
  color: white;
  border-radius: 8px;
  box-shadow: var(--shadow-hover);
  transform: translateX(400px);
  transition: var(--transition);
  z-index: 1000;
  max-width: 300px;
}

.toast.show {
  transform: translateX(0);
}

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

.toast.info {
  background: var(--primary-color);
}

/* ============= FOOTER ============= */

.footer {
  background: var(--dark-color);
  color: white;
  text-align: center;
  padding: 2rem;
  margin-top: 4rem;
  border-top: 4px solid var(--primary-color);
}

.footer p {
  margin: 0;
}

/* ============= RESPONSIVE DESIGN ============= */

@media (max-width: 768px) {
  .navbar .container {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .button-group {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .results-table {
    font-size: 0.9rem;
  }

  .results-table th,
  .results-table td {
    padding: 0.75rem 0.5rem;
  }

  .section-header h2 {
    font-size: 1.5rem;
  }

  .tabs {
    gap: 0.5rem;
  }

  .tab-btn {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
  }

  .list-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .toast {
    bottom: 10px;
    right: 10px;
    left: 10px;
    max-width: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 10px;
  }

  .card {
    padding: 1rem;
  }

  .section {
    padding: 1rem 0;
  }

  .logo {
    font-size: 1.3rem;
  }

  .section-header h2 {
    font-size: 1.2rem;
  }

  .results-table {
    font-size: 0.8rem;
  }

  .btn {
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
  }

  .filter-badges {
    gap: 0.3rem;
  }

  .badge {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
  }
}

/* ============= SCROLLBAR STYLING ============= */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--light-color);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #2980b9;
}