:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #64748b;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --sidebar-width: 240px;
}

body.dark-theme {
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
}

body.dark-theme .inventory-table th {
    background-color: #0f172a;
    color: #cbd5e1;
}
body.dark-theme .nav-item:hover {
    background-color: #334155;
}
body.dark-theme .nav-item.active {
    background-color: #1e293b;
    color: var(--primary-color);
}
body.dark-theme .status-out {
    background-color: #334155;
    color: #f8fafc;
}
body.dark-theme .row-low-stock {
    background-color: rgba(239, 68, 68, 0.1);
}
body.dark-theme .row-low-stock td {
    border-bottom-color: rgba(239, 68, 68, 0.2);
}
body.dark-theme .search-bar input,
body.dark-theme .form-group select, 
body.dark-theme .form-group input {
    background-color: #0f172a;
    color: var(--text-primary);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
}

#app {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 24px 0;
}

.sidebar-header {
    display: flex;
    align-items: center;
    padding: 0 24px 24px 24px;
    gap: 12px;
}

.logo-icon {
    color: var(--primary-color);
    font-size: 28px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    gap: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-item:hover {
    background-color: #f1f5f9;
    color: var(--text-primary);
}

.nav-item.active {
    background-color: #eff6ff;
    color: var(--primary-color);
    border-right: 3px solid var(--primary-color);
}

.divider-nav {
    height: 1px;
    background-color: var(--border-color);
    margin: 12px 0;
    padding: 0;
}

.sidebar-footer {
    margin-top: auto;
    padding: 0 24px;
}
.back-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    padding: 12px 0;
}
.back-link:hover {
    color: var(--text-primary);
}

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

.app-header {
    height: 70px;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 32px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}
.header-left h2 {
    font-size: 18px;
    font-weight: 600;
}
.menu-icon {
    display: none;
    cursor: pointer;
    color: var(--text-secondary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}
.search-bar {
    display: flex;
    align-items: center;
    background: #f1f5f9;
    padding: 8px 16px;
    border-radius: 20px;
    gap: 8px;
}
.search-bar input {
    border: none;
    background: transparent;
    outline: none;
    font-family: inherit;
    width: 200px;
}
.search-bar .material-icons {
    color: var(--text-secondary);
    font-size: 20px;
}
.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}
.icon-btn {
    color: var(--text-secondary);
    cursor: pointer;
}

.dashboard-content {
    padding: 32px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Buttons */
.btn {
    padding: 10px 16px;
    border-radius: 6px;
    font-weight: 500;
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    transition: all 0.2s;
}
.btn-primary {
    background-color: var(--primary-color);
    color: white;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
}
.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}
.btn-outline:hover {
    background-color: #f1f5f9;
}
.btn-danger {
    background-color: var(--danger-color);
    color: white;
}
.btn-danger:hover {
    background-color: var(--danger-hover);
}

/* KPIs */
.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.analytics-card {
    background: var(--surface-color);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}
.alert-card {
    border-left: 4px solid var(--danger-color);
}
.stat-title {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
}
.stat-number {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
}
.alert-text {
    color: var(--danger-color);
}
.stat-trend {
    display: flex;
    align-items: center;
    font-size: 13px;
    font-weight: 500;
    gap: 4px;
}
.stat-trend.positive { color: var(--success-color); }
.stat-trend.negative { color: var(--danger-color); }
.stat-trend.neutral { color: var(--text-secondary); }
.stat-trend .material-icons { font-size: 16px; }

/* Table Section */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
.section-header h3 {
    font-size: 20px;
    font-weight: 600;
}
.action-buttons {
    display: flex;
    gap: 12px;
}

.table-container {
    background: var(--surface-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.inventory-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.inventory-table th, .inventory-table td {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
}

.inventory-table th {
    background-color: #f8fafc;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.inventory-table td {
    font-size: 14px;
    color: var(--text-primary);
}

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

.item-name {
    font-weight: 600;
}

.stock-value {
    font-family: monospace;
    font-size: 15px;
    font-weight: 600;
}

/* Status Badges */
.status-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}
.status-good {
    background-color: #d1fae5;
    color: #065f46;
}
.status-low {
    background-color: #fee2e2;
    color: #991b1b;
    animation: pulse-red 2s infinite;
}
.status-out {
    background-color: #f3f4f6;
    color: #374151;
}

/* Row states */
.row-low-stock {
    background-color: #fef2f2;
}
.row-low-stock td {
    border-bottom-color: #fecaca;
}

/* Animations */
.stagger-in {
    opacity: 0;
    transform: translateY(10px);
    animation: fadeUp 0.5s ease forwards;
}

@keyframes fadeUp {
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse-red {
    0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    70% { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
    100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal {
    background: var(--surface-color);
    border-radius: 12px;
    width: 400px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
}
.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-close {
    cursor: pointer;
    color: var(--text-secondary);
}
.modal-body {
    padding: 24px;
}
.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 16px;
}
.form-group label {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.form-group select, .form-group input {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
    font-size: 14px;
    background-color: #f8fafc;
    color: var(--text-primary);
}
.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    background-color: #f8fafc;
    border-radius: 0 0 12px 12px;
}

/* Toasts */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 2000;
}
.toast {
    background: var(--surface-color);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border-left: 4px solid var(--primary-color);
    display: flex;
    align-items: center;
    gap: 12px;
    transform: translateX(120%);
    animation: slideInRight 0.3s forwards;
    font-size: 14px;
    font-weight: 500;
}
.toast.waste {
    border-left-color: var(--danger-color);
}
.toast.waste .material-icons {
    color: var(--danger-color) !important;
}
.toast.hide {
    animation: slideOutRight 0.3s forwards;
}
@keyframes slideInRight {
    to { transform: translateX(0); }
}
@keyframes slideOutRight {
    to { transform: translateX(120%); }
}

/* Mobile */
@media (max-width: 900px) {
    .stats-row {
        grid-template-columns: 1fr;
    }
    .header-right .search-bar {
        display: none;
    }
}
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -240px;
        top: 70px;
        height: calc(100vh - 70px);
        z-index: 900;
        transition: left 0.3s ease;
        box-shadow: 2px 0 8px rgba(0,0,0,0.1);
    }
    .sidebar.open {
        left: 0;
    }
    .menu-icon {
        display: block;
    }
    .inventory-table th, .inventory-table td {
        padding: 12px 8px;
        font-size: 12px;
    }
}

/* Settings Card & Toggle Switch */
.settings-card {
    background: var(--surface-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    padding: 24px;
    max-width: 800px;
}

.settings-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
}
.settings-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}
.settings-row h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 4px;
}
.settings-row .subtitle {
    color: var(--text-secondary);
    font-size: 13px;
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 26px;
}
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #cbd5e1;
  transition: .4s;
}
.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
}
input:checked + .slider {
  background-color: var(--primary-color);
}
input:checked + .slider:before {
  transform: translateX(24px);
}
.slider.round {
  border-radius: 34px;
}
.slider.round:before {
  border-radius: 50%;
}