:root {
    /* Light theme (default) */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F3F2EF;
    --bg-tertiary: #E8E5DF;
    --text-primary: #000000;
    --text-secondary: #666666;
    --border-color: #E0DEDA;
    --accent-primary: #0A66C2;
    --accent-hover: #004182;
    --success: #057642;
    --warning: #B78103;
    --error: #CC1022;
}

[data-theme="dark"] {
    --bg-primary: #1A1A1A;
    --bg-secondary: #242424;
    --bg-tertiary: #2D2D2D;
    --text-primary: #FFFFFF;
    --text-secondary: #A0A0A0;
    --border-color: #3D3D3D;
    --accent-primary: #0A66C2;
    --accent-hover: #3B8DD6;
    --success: #0B8A54;
    --warning: #D49B1A;
    --error: #E62E3F;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.2s, color 0.2s;
}

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

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

/* --- Layout --- */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
}

/* --- Top Navigation --- */
.topnav {
    height: 56px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 16px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.topnav__brand {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-right: 24px;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.topnav__brand--mobile {
    display: none;
    font-size: 20px;
    font-weight: 700;
    color: #004182; /* darker blue */
    letter-spacing: 0.04em;
}

/* Show BM on mobile, hide full name */
@media (max-width: 768px) {
    .topnav__brand--desktop {
        display: none;
    }
    .topnav__brand--mobile {
        display: inline-flex;
    }
    .topnav__brand {
        margin-right: auto;
    }
}

.topnav__controls {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
}

/* --- Buttons (LinkedIn-style: uniform base, variant on top) --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 32px;
    padding: 0 16px;
    border-radius: 16px; /* pill shape */
    border: 1px solid transparent;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s, border-color 0.15s, box-shadow 0.15s, color 0.15s;
    line-height: 1;
    white-space: nowrap;
    text-decoration: none;
    gap: 6px;
}

@media (max-width: 768px) {
    .btn {
        height: 32px;
        padding: 0 12px;
    }
}

.btn--primary {
    background-color: var(--accent-primary);
    color: #fff;
    border-color: var(--accent-primary);
}

.btn--primary:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
    box-shadow: 0 0 0 3px rgba(10, 102, 194, 0.2);
}

.btn--secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn--secondary:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--text-secondary);
}

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

.btn--danger:hover {
    background-color: #a80d1c;
    border-color: #a80d1c;
    box-shadow: 0 0 0 3px rgba(204, 16, 34, 0.2);
}

.btn--small {
    height: 28px;
    padding: 0 12px;
    font-size: 13px;
    font-weight: 600;
}

/* --- Forms --- */
.form-control,
.form-select,
input[type="date"],
input[type="month"] {
    height: 40px;
    padding: 0 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    width: 100%;
    transition: border-color 0.15s;
}

.form-control:focus,
.form-select:focus,
input[type="date"]:focus,
input[type="month"]:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(10, 102, 194, 0.2);
}

/* Month/year picker: show calendar icon hint */
input[type="month"] {
    cursor: pointer;
}

input[type="date"] {
    cursor: pointer;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 4px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.form-error {
    color: var(--error);
    font-size: 12px;
    margin-top: 4px;
}

.form-help {
    color: var(--text-secondary);
    font-size: 12px;
    margin-top: 6px;
}

.form-shell {
    max-width: 720px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
    overflow: hidden;
}

.form-shell__intro {
    padding: 24px 28px;
    background: linear-gradient(135deg, rgba(10, 102, 194, 0.10), rgba(10, 102, 194, 0.02));
    border-bottom: 1px solid var(--border-color);
}

.form-shell__eyebrow {
    display: block;
    margin-bottom: 6px;
    color: var(--accent-primary);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.form-shell__intro h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 4px;
}

.form-shell__intro p {
    color: var(--text-secondary);
    font-size: 14px;
}

.form-shell form {
    padding: 28px;
}

.form-shell .form-group {
    padding-bottom: 16px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.form-shell .form-group:last-of-type {
    border-bottom: none;
}

.form-shell input[type="checkbox"].form-control {
    width: 18px;
    height: 18px;
    padding: 0;
    accent-color: var(--accent-primary);
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    padding-top: 8px;
}

@media (max-width: 640px) {
    .form-shell__intro,
    .form-shell form {
        padding: 20px;
    }

    .form-actions {
        flex-direction: column;
        align-items: stretch;
    }
}

/* --- Cards --- */
.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 16px;
}

/* --- Table --- */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    text-align: left;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-weight: 600;
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.table tbody tr:hover {
    background-color: var(--bg-tertiary);
}

.table tbody tr.clickable {
    cursor: pointer;
}

.table tbody tr.clickable td:first-child a {
    color: var(--accent-primary);
    text-decoration: none;
}

.table tbody tr.clickable td:first-child a:hover {
    text-decoration: underline;
}

/* Prevent row click from firing when clicking action buttons or links inside */
.table tbody tr.clickable td a,
.table tbody tr.clickable td form,
.table tbody tr.clickable td button {
    position: relative;
    z-index: 2;
}

.meter-ledger-table th,
.meter-ledger-table td {
    vertical-align: middle;
}

.meter-ledger-table__actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 8px;
}

.meter-ledger-table__settled-date {
    color: var(--text-secondary);
    display: inline-block;
    font-size: 12px;
    margin-left: 8px;
}

/* --- Table as Card Grid on Narrow Content Areas ---
   The desktop sidebar leaves much less usable width than the viewport,
   so wide tables need to collapse before the mobile nav breakpoint. */
@media (max-width: 1200px) {
    .table,
    .table thead,
    .table tbody,
    .table th,
    .table td,
    .table tr {
        display: block;
    }

    .table thead {
        display: none;
    }

    .table tbody {
        display: grid;
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .table tr {
        background-color: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: 4px;
        padding: 12px 16px;
        min-width: 0;
    }

    .table td {
        padding: 6px 0;
        border-bottom: none;
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        gap: 16px;
        min-width: 0;
        overflow-wrap: anywhere;
        word-break: break-word;
    }

    .table td::before {
        content: attr(data-label);
        font-weight: 600;
        font-size: 12px;
        color: var(--text-secondary);
        text-transform: uppercase;
        letter-spacing: 0.02em;
        margin-right: 12px;
        flex-shrink: 0;
        width: min(42%, 150px);
    }

    .table td:not([data-label]) {
        justify-content: flex-end;
        padding-top: 8px;
    }

    .table td:not([data-label])::before {
        display: none;
    }

    .table td > *:not(form) {
        max-width: 100%;
    }

    .table td .flex {
        flex-wrap: wrap;
        justify-content: flex-end;
    }

    .meter-ledger-table__actions {
        justify-content: flex-end;
    }

    .meter-ledger-table__settled-date {
        display: block;
        margin-left: 0;
        margin-top: 4px;
        text-align: right;
    }
}

/* --- Pagination --- */
.pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.pagination__info {
    font-size: 13px;
    color: var(--text-secondary);
}

.pagination__nav {
    display: flex;
    gap: 8px;
}

.btn[disabled] {
    opacity: 0.4;
    pointer-events: none;
}

/* --- Badges --- */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    text-transform: capitalize;
    line-height: 1.4;
}

/* LinkedIn-style role badges */
.badge--super_user {
    background-color: var(--accent-primary);
    color: #fff;
}

.badge--admin {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.badge--data_entry_clerk {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* Unit type badges */
.badge--apartment {
    background-color: var(--accent-primary);
    color: #fff;
}

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

.badge--villa {
    background-color: #7C3AED;
    color: #fff;
}

.badge--office {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.badge--cafe_restaurant {
    background-color: #92400E;
    color: #fff;
}

.badge--space {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.badge--undefined {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* Meter type badges */
.badge--electric {
    background-color: var(--warning);
    color: #fff;
}

.badge--water {
    background-color: var(--info);
    color: #fff;
}

.badge--gas {
    background-color: var(--accent-primary);
    color: #fff;
}

/* Unit status badges */
.badge--vacant {
    background-color: var(--success);
    color: #fff;
}

.badge--leased {
    background-color: var(--accent-primary);
    color: #fff;
}

/* Lease ledger status badges */
.badge--paid {
    background-color: var(--success);
    color: #fff;
}

.badge--partial {
    background-color: var(--warning);
    color: #fff;
}

.badge--unpaid {
    background-color: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.badge--overdue {
    background-color: var(--error);
    color: #fff;
}

/* --- Messages --- */
.messages {
    list-style: none;
    padding: 0;
    margin: 16px 0;
}

.message {
    padding: 12px 16px;
    border-radius: 4px;
    margin-bottom: 8px;
    font-size: 14px;
}

.message--success {
    background-color: var(--success);
    color: #fff;
}

.message--error {
    background-color: var(--error);
    color: #fff;
}

.message--warning {
    background-color: var(--warning);
    color: #fff;
}

/* --- Utility --- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.text-center { text-align: center; }
.w-full { width: 100%; }

/* --- Page Header --- */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    gap: 12px;
}

.page-header h1 {
    font-size: 24px;
    font-weight: 600;
    word-break: break-word;
}

@media (max-width: 768px) {
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .page-header h1 {
        font-size: 20px;
    }
}

/* --- Content wrapper --- */
.content {
    padding: 24px 16px;
    min-height: calc(100vh - 56px);
}

/* --- Theme/Lang toggle bar --- */
.toggle-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    padding: 4px 8px;
    font-size: 12px;
    cursor: pointer;
    transition: background-color 0.15s;
}

.toggle-btn:hover {
    background-color: var(--bg-tertiary);
}

.toggle-btn--active {
    background-color: var(--accent-primary);
    color: #fff;
    border-color: var(--accent-primary);
}

/* --- Sidebar (Desktop) --- */
.topnav__hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 4px;
    margin-right: 12px;
}

.sidebar {
    position: fixed;
    top: 56px;
    left: 0;
    width: 240px;
    height: calc(100vh - 56px);
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 50;
    transition: width 0.2s ease, transform 0.2s ease;
}

.sidebar__collapse-btn {
    position: absolute;
    top: 50%;
    right: -10px;
    transform: translateY(-50%);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 4px 4px 0;
    color: var(--text-secondary);
    width: 20px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    transition: color 0.2s, background-color 0.2s;
    z-index: 51;
}

.sidebar__collapse-btn:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar--collapsed .sidebar__collapse-btn {
    right: -10px;
}

.sidebar--collapsed #collapse-icon {
    transform: rotate(180deg);
}

.sidebar__nav {
    padding: 8px 0;
}

.sidebar__item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    color: var(--text-primary);
    font-size: 14px;
    transition: background-color 0.15s;
    text-decoration: none;
    white-space: nowrap;
}

.sidebar__item:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar__item--active {
    background-color: var(--bg-tertiary);
    color: var(--accent-primary);
}

.sidebar__parent {
    font-weight: 600;
}

.sidebar__icon {
    flex-shrink: 0;
    opacity: 0.75;
}

/* --- Submenu group --- */
.sidebar__group {
    margin-bottom: 2px;
}

.sidebar__group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    transition: background-color 0.15s;
    text-align: left;
}

.sidebar__group-header:hover {
    background-color: var(--bg-tertiary);
}

.sidebar__group-header--open {
    background-color: var(--bg-tertiary);
}

.sidebar__item-text {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar__chevron {
    flex-shrink: 0;
    transition: transform 0.2s;
    opacity: 0.5;
}

.sidebar__group-header--open .sidebar__chevron {
    transform: rotate(90deg);
}

.sidebar__group-items {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
}

.sidebar__group-items--open {
    max-height: 200px;
}

/* --- Child items --- */
.sidebar__item--child {
    padding-left: 52px;
    font-size: 13px;
    font-weight: 400;
}

.sidebar__item--child .sidebar__icon {
    opacity: 0.5;
}

/* Submenu group visible on desktop */
@media (min-width: 769px) {
    /* Groups open by default on desktop */
    .sidebar__group-items--open {
        max-height: 200px;
    }
}

/* --- Collapsed sidebar state (Desktop) --- */
.sidebar--collapsed {
    width: 56px;
}

.sidebar--collapsed .sidebar__collapse-btn {
    right: -10px;
}

.sidebar--collapsed .sidebar__item,
.sidebar--collapsed .sidebar__group-header {
    justify-content: center;
    padding: 10px 8px;
}

.sidebar--collapsed .sidebar__item span,
.sidebar--collapsed .sidebar__item-text > span,
.sidebar--collapsed .sidebar__group-items {
    display: none !important;
}

.sidebar--collapsed .sidebar__item--child {
    padding-left: 8px;
}

.sidebar--collapsed .sidebar__item:not(.sidebar__item--child) {
    padding: 10px 0;
}

.sidebar--collapsed .sidebar__icon {
    opacity: 1;
}

.sidebar--collapsed .sidebar__chevron {
    display: none;
}

.sidebar-overlay {
    display: none;
}

/* --- Content offset for desktop sidebar --- */
@media (min-width: 769px) {
    .content {
        padding-left: 256px;
        transition: padding-left 0.2s ease;
    }

    .content--expanded {
        padding-left: 72px;
    }
}

/* --- Sidebar (Mobile) --- */
@media (max-width: 768px) {
    .topnav__hamburger {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
        box-shadow: 4px 0 16px rgba(0, 0, 0, 0.1);
        width: 240px;
    }

    .sidebar--open {
        transform: translateX(0);
    }

    .sidebar__collapse-btn {
        display: none;
    }

    .sidebar-overlay {
        display: block;
        position: fixed;
        inset: 0;
        top: 56px;
        background-color: rgba(0, 0, 0, 0.4);
        z-index: 40;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.2s ease;
    }

    .sidebar-overlay--visible {
        opacity: 1;
        pointer-events: auto;
    }

    /* Submenus open by default on mobile */
    .sidebar__group-items {
        max-height: 200px;
    }

    .sidebar__chevron {
        display: none;
    }

    .sidebar__group-header {
        padding-right: 16px;
    }
}

/* --- Login Page --- */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 56px);
    margin: -24px -16px;
    padding: 24px 16px;
    background-color: var(--bg-secondary);
}

@media (min-width: 769px) {
    .login-page {
        margin-left: -256px;
        padding-left: calc(256px + 16px);
    }
}

.login-card {
    width: 100%;
    max-width: 480px;
    padding: 32px;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12), 0 0 1px rgba(0, 0, 0, 0.1);
    background-color: var(--bg-primary);
}

.login-card__header {
    text-align: center;
    margin-bottom: 24px;
}

.login-card__header h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 4px;
}

.login-card__header p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* --- Dashboard --- */
.dashboard {
    max-width: 1280px;
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

@media (max-width: 1024px) {
    .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .kpi-grid {
        grid-template-columns: 1fr;
    }
}

.kpi-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: var(--text-primary);
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s, background-color 0.15s;
    background-color: var(--bg-secondary);
}

.kpi-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    color: var(--text-primary);
}

.kpi-card__icon {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.kpi-card__number {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 4px;
}

.kpi-card__label {
    font-size: 13px;
    color: var(--text-secondary);
    text-align: center;
}

.kpi-card__sum {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 4px;
}

/* KPI card color variants */
.kpi-card--warning .kpi-card__icon {
    color: var(--warning);
}

.kpi-card--danger .kpi-card__icon {
    color: var(--error);
}

.kpi-card--info .kpi-card__icon {
    color: var(--info);
}

.kpi-card--success .kpi-card__icon {
    color: var(--success);
}

/* Dashboard section */
.dashboard-section {
    margin-bottom: 32px;
}

.dashboard-section__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.dashboard-section__header h2 {
    font-size: 18px;
    font-weight: 600;
}

/* Dashboard empty state */
.dashboard-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 64px 16px;
    text-align: center;
    color: var(--text-secondary);
}

.dashboard-empty svg {
    margin-bottom: 16px;
    opacity: 0.5;
}

.dashboard-empty p {
    font-size: 14px;
}

/* --- Sidebar: top-level item (no submenu) --- */
.sidebar__item--top {
    font-weight: 600;
}