:root {
    /* Color Palette - Light Theme */
    --color-white: #ffffff;
    --color-light-green: #83b6ad;
    --color-green-hover: #6a9d8f;
    --color-yellow: #fbbf24;
    --color-yellow-hover: #f59e0b;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Semantic Colors */
    --color-primary: var(--color-light-green);
    --color-primary-hover: var(--color-green-hover);
    --color-secondary: var(--color-yellow);
    --color-secondary-hover: var(--color-yellow-hover);
    --color-background: var(--color-gray-50);
    --color-surface: var(--color-white);
    --color-text: var(--color-gray-900);
    --color-text-secondary: var(--color-gray-600);
    --color-border: var(--color-gray-200);
    --color-danger: #ef4444;
    --color-danger-hover: #dc2626;
    --color-success: var(--color-light-green);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

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

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;

    /* Layout */
    --sidebar-width: 280px;
    --header-height: 70px;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-3xl);
}

h2 {
    font-size: var(--font-size-2xl);
}

h3 {
    font-size: var(--font-size-xl);
}

h4 {
    font-size: var(--font-size-lg);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-green-hover));
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-hover));
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-danger:hover:not(:disabled) {
    background: var(--color-danger-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

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

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

/* Cards */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-border);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    margin: 0;
}

.card-body {
    margin-bottom: var(--spacing-md);
}

.card-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-text);
    font-size: var(--font-size-sm);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(131, 182, 173, 0.1);
}

.form-control::placeholder {
    color: var(--color-gray-300);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-error {
    color: var(--color-danger);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--color-surface);
    border-bottom: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.header-logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.header-logo-text {
    color: #83b6ad;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 2px solid var(--color-primary);
}

.user-name {
    font-weight: 600;
    color: var(--color-text);
}

.user-position {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--color-surface);
    border-right: 2px solid var(--color-border);
    padding: var(--spacing-lg);
    overflow-y: auto;
    transition: transform var(--transition-base);
    z-index: 999;
}

.sidebar-nav {
    list-style: none;
}

.sidebar-item {
    margin-bottom: var(--spacing-sm);
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    color: var(--color-text);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.sidebar-link:hover {
    background: var(--color-gray-100);
    color: var(--color-primary);
    transform: translateX(4px);
}

.sidebar-link.active {
    background: linear-gradient(135deg, var(--color-primary), var(--color-green-hover));
    color: white;
}

.sidebar-link i {
    font-size: var(--font-size-lg);
    width: 24px;
    text-align: center;
}

/* Submenu Styles */
.sidebar-item.has-submenu>.sidebar-link {
    position: relative;
}

.submenu-arrow {
    margin-left: auto;
    transition: transform var(--transition-base);
    font-size: var(--font-size-sm);
}

.sidebar-item.has-submenu.open>.sidebar-link .submenu-arrow {
    transform: rotate(180deg);
}

.sidebar-submenu {
    list-style: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base) ease-out;
    padding-left: var(--spacing-xl);
}

.sidebar-item.has-submenu.open .sidebar-submenu {
    max-height: 500px;
    transition: max-height var(--transition-base) ease-in;
}

.sidebar-submenu li {
    margin-bottom: var(--spacing-xs);
}

.sidebar-submenu .sidebar-link {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.sidebar-submenu .sidebar-link:hover {
    transform: translateX(2px);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    padding: var(--spacing-xl);
    min-height: calc(100vh - var(--header-height));
    transition: margin-left var(--transition-base);
}

/* Sidebar Collapsed State */
body.sidebar-collapsed .sidebar {
    transform: translateX(-100%);
}

body.sidebar-collapsed .main-content {
    margin-left: 0;
}

/* Menu Toggle Button */
.menu-toggle {
    display: flex;
    background: var(--color-primary);
    color: white;
    border: none;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-xl);
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    /* Above sidebar */
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    color: white;
}

.stat-icon.green {
    background: linear-gradient(135deg, var(--color-primary), var(--color-green-hover));
}

.stat-icon.yellow {
    background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-hover));
}

.stat-info h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin: 0;
    color: var(--color-text);
}

.stat-info p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    margin-bottom: var(--spacing-lg);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

thead {
    background: linear-gradient(135deg, var(--color-primary), var(--color-green-hover));
    color: white;
}

th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

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

tbody tr {
    transition: background var(--transition-fast);
}

tbody tr:hover {
    background: var(--color-gray-50);
}

/* Image Preview */
.image-preview {
    width: 150px;
    height: 150px;
    border-radius: var(--radius-lg);
    border: 3px dashed var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: var(--spacing-sm);
    background: var(--color-gray-50);
}

.image-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-preview-placeholder {
    color: var(--color-gray-300);
    font-size: var(--font-size-sm);
    text-align: center;
}

/* User Avatar in Table */
.user-avatar-sm {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 2px solid var(--color-primary);
}

/* Utilities */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mb-0 {
    margin-bottom: 0;
}

.mb-1 {
    margin-bottom: var(--spacing-md);
}

.mb-2 {
    margin-bottom: var(--spacing-lg);
}

.mt-1 {
    margin-top: var(--spacing-md);
}

.mt-2 {
    margin-top: var(--spacing-lg);
}

.d-flex {
    display: flex;
}

.align-items-center {
    align-items: center;
}

.justify-content-between {
    justify-content: space-between;
}

.gap-1 {
    gap: var(--spacing-md);
}

/* User Cards Grid */
.users-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* Individual User Card */
.user-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.user-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.user-card-photo {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 3px solid var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.user-card-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.user-card-position,
.user-card-login,
.user-card-email,
.user-card-created-at {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.user-card-actions {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
}


/* Mobile Responsive */
@media (max-width: 768px) {
    .header-logo {
        font-size: var(--font-size-lg);
    }

    .user-details {
        display: none;
    }

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

    .table-responsive {
        font-size: var(--font-size-sm);
    }

    th,
    td {
        padding: var(--spacing-sm);
    }

    /* Hide tables on small screens */
    #consumerUnitsTable,
    #consumptionsTable,
    #usersTable {
        display: none !important;
    }

    /* Show cards on small screens */
    #consumerUnitsCards,
    #consumptionsCards,
    #usersCards {
        display: grid !important;
    }

    /* Hide report tables and show report cards on small screens */
    #billingReportTableContainer,
    #receivablesReportTableContainer,
    #receiptsReportTableContainer {
        display: none !important;
    }

    #billingReportCardsContainer,
    #receivablesReportCardsContainer,
    #receiptsReportCardsContainer {
        display: grid !important;
    }
}

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

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

.fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--color-gray-200);
    border-top: 3px solid var(--color-primary);
    border-radius: var(--radius-full);
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: var(--spacing-xl) auto;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Tab System */
.tabs {
    margin-bottom: var(--spacing-xl);
}

.tab-header {
    display: flex;
    gap: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.tab-item {
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 600;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all var(--transition-fast);
    position: relative;
    bottom: -2px;
}

.tab-item:hover {
    color: var(--color-primary);
    background: var(--color-gray-50);
}

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

.tab-content {
    animation: fadeIn var(--transition-base) ease-out;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
    animation: fadeIn var(--transition-base) ease-out;
}

/* Form Validation States */
.form-control.is-valid {
    border-color: var(--color-success);
    padding-right: calc(1.5em + 0.75rem);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2383b6ad' d='M2.3 6.73L.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-control.is-valid:focus {
    border-color: var(--color-success);
    box-shadow: 0 0 0 3px rgba(131, 182, 173, 0.15);
}

.form-control.is-invalid {
    border-color: var(--color-danger);
    padding-right: calc(1.5em + 0.75rem);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23ef4444'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/%3e%3ccircle cx='6' cy='8.2' r='.6' fill='%23ef4444' stroke='none'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-control.is-invalid:focus {
    border-color: var(--color-danger);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

/* Password Strength Meter */
.password-strength-container {
    margin-top: var(--spacing-sm);
}

.password-strength-bar {
    height: 4px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.password-strength-fill {
    height: 100%;
    width: 0%;
    transition: all var(--transition-base);
    border-radius: var(--radius-full);
}

.password-strength-fill.weak {
    width: 33%;
    background: var(--color-danger);
}

.password-strength-fill.medium {
    width: 66%;
    background: var(--color-secondary);
}

.password-strength-fill.strong {
    width: 100%;
    background: var(--color-success);
}

.password-strength-text {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.password-strength-text.weak {
    color: var(--color-danger);
}

.password-strength-text.medium {
    color: var(--color-secondary-hover);
}

.password-strength-text.strong {
    color: var(--color-success);
}

/* Form Grid Layout */
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

/* Text Secondary */
.text-secondary {
    color: var(--color-text-secondary);
}

/* Enhanced Form Control Hover */
.form-control:hover:not(:focus):not(:disabled) {
    border-color: var(--color-gray-300);
}

/* Tooltip */
.tooltip-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background: var(--color-gray-300);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    cursor: help;
    margin-left: var(--spacing-xs);
    transition: all var(--transition-fast);
}

.tooltip-icon:hover {
    background: var(--color-primary);
    transform: scale(1.1);
}

/* Badge Styles */ .badge  {
         display:  inline-block;
         padding:  0.35em 0.65em;
         font-size:  .75em;
         font-weight:  700;
         line-height:  1;
         color:  #fff;
         text-align:  center;
         white-space:  nowrap;
         vertical-align:  baseline;
         border-radius:  var(--radius-full);
     
}

  .badge-success  {
         background-color:  var(--color-success);
     
}

  .badge-warning  {
         background-color:  var(--color-secondary);
     
}

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

  .badge-secondary  {
         background-color:  var(--color-gray-600);
     
}

    /* Sidebar Submenu */ .sidebar-item.has-submenu .sidebar-link  {
         justify-content:  space-between;
     
}

  .submenu-arrow  {
         transition:  transform var(--transition-base);
     
}

  .sidebar-submenu  {
         list-style:  none;
         padding-left:  2.5rem;
     /* Indent submenu items */     max-height:  0;
         overflow:  hidden;
         transition:  max-height var(--transition-base) ease-out;
     
}

  .sidebar-item.active .sidebar-submenu  {
         max-height:  500px;
     /* Animate open */     transition:  max-height var(--transition-slow) ease-in;
     
}

  .sidebar-item.active .submenu-arrow  {
         transform:  rotate(180deg);
     
}

  .sidebar-submenu .sidebar-link  {
         padding-top:  var(--spacing-sm);
         padding-bottom:  var(--spacing-sm);
         font-size:  var(--font-size-sm);
     
}

    /* Report Cards Grid */ .report-cards-grid  {
         display:  grid;
         grid-template-columns:  1fr;
         gap:  var(--spacing-md);
     
}

  .report-card  {
         background:  var(--color-gray-50);
         border-radius:  var(--radius-md);
         padding:  var(--spacing-md);
         border-left:  4px solid var(--color-primary);
     
}

  .report-card p  {
         margin:  0 0 var(--spacing-sm) 0;
         font-size:  var(--font-size-sm);
         color:  var(--color-text-secondary);
     
}

  .report-card p strong  {
         color:  var(--color-text);
         font-weight:  600;
     
}