/* ========================================
   Real Estate Property Management System
   Styles - Fully Responsive
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --primary: #1E3A5F;
    --primary-light: #2A4A73;
    --primary-dark: #152C47;
    --secondary: #2ECC71;
    --secondary-light: #58D68D;
    --accent: #F39C12;
    --accent-light: #F5B041;
    
    /* Backgrounds */
    --bg-main: #F8FAFC;
    --bg-surface: #FFFFFF;
    --bg-sidebar: #1E3A5F;
    
    /* Text */
    --text-primary: #1A202C;
    --text-secondary: #718096;
    --text-light: #A0AEC0;
    --text-white: #FFFFFF;
    
    /* Status Colors */
    --success: #10B981;
    --success-light: rgba(16, 185, 129, 0.1);
    --warning: #F59E0B;
    --warning-light: rgba(245, 158, 11, 0.1);
    --danger: #EF4444;
    --danger-light: rgba(239, 68, 68, 0.1);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-full: 50%;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 10px 25px rgba(0, 0, 0, 0.2);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease-in-out;
    --transition-slow: 0.3s ease-in-out;
    
    /* Sidebar */
    --sidebar-width: 260px;
    --sidebar-collapsed: 80px;
    --header-height: 70px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-main);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ========================================
   Sidebar Styles
   ======================================== */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    color: var(--text-white);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 20px;
    font-weight: 700;
}

.logo i {
    font-size: 24px;
    color: var(--secondary);
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-white);
    font-size: 20px;
    cursor: pointer;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md) 0;
    overflow-y: auto;
}

.sidebar-nav ul li a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: rgba(255, 255, 255, 0.7);
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.sidebar-nav ul li a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-white);
}

.sidebar-nav ul li.active a {
    background: rgba(46, 204, 113, 0.2);
    color: var(--text-white);
    border-left-color: var(--secondary);
}

.sidebar-nav ul li a i {
    width: 20px;
    text-align: center;
    font-size: 16px;
}

.sidebar-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-footer a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.sidebar-footer a:hover {
    color: var(--text-white);
}

/* ========================================
   Main Content Area
   ======================================== */

.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Header Styles
   ======================================== */

.header {
    height: var(--header-height);
    background: var(--bg-surface);
    border-bottom: 1px solid #E2E8F0;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 20px;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-sm);
}

.search-box {
    position: relative;
    width: 320px;
}

.search-box i {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

.search-box input {
    width: 100%;
    padding: 10px 12px 10px 40px;
    border: 1px solid #E2E8F0;
    border-radius: var(--radius-lg);
    background: var(--bg-main);
    transition: all var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-surface);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

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

.header-btn {
    position: relative;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-main);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-btn:hover {
    background: var(--primary);
    color: var(--text-white);
}

.header-btn .badge {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 18px;
    height: 18px;
    background: var(--danger);
    color: var(--text-white);
    font-size: 10px;
    font-weight: 600;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-main);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.user-profile:hover {
    background: #EDF2F7;
}

.user-profile img {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
}

.user-role {
    font-size: 11px;
    color: var(--text-secondary);
}

.user-profile > i {
    font-size: 10px;
    color: var(--text-light);
    margin-left: var(--spacing-xs);
}

/* ========================================
   Content Area
   ======================================== */

.content {
    flex: 1;
    padding: var(--spacing-lg);
}

/* ========================================
   Section Headers
   ======================================== */

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.section-header h1,
.section-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

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

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

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

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    border: 1px solid #E2E8F0;
    color: var(--text-primary);
}

.btn-outline:hover {
    background: var(--bg-main);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* ========================================
   Filter Buttons
   ======================================== */

.filter-group {
    display: flex;
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    padding: 4px;
    border: 1px solid #E2E8F0;
}

.filter-btn {
    padding: 8px 16px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.filter-btn.active {
    background: var(--primary);
    color: var(--text-white);
}

/* ========================================
   Dashboard Stats
   ======================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

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

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

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-change {
    font-size: 12px;
    margin-top: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.stat-change.positive {
    color: var(--success);
}

.stat-change.negative {
    color: var(--danger);
}

/* ========================================
   Charts
   ======================================== */

.charts-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.chart-card {
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.chart-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.chart-header select {
    padding: 6px 12px;
    border: 1px solid #E2E8F0;
    border-radius: var(--radius-md);
    background: var(--bg-main);
    font-size: 12px;
    cursor: pointer;
}

.chart-body {
    height: 250px;
}

/* Bar Chart */
.bar-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    height: 100%;
    padding-top: var(--spacing-lg);
}

.bar {
    flex: 1;
    height: var(--height);
    background: var(--color);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    position: relative;
    margin: 0 4px;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.bar:hover {
    opacity: 0.8;
    transform: scaleY(1.02);
}

.bar-label {
    position: absolute;
    bottom: -24px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* Donut Chart */
.donut-chart-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
}

.donut-chart {
    position: relative;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: conic-gradient(
        var(--success) 0% 72%,
        var(--warning) 72% 90%,
        var(--danger) 90% 100%
    );
    display: flex;
    align-items: center;
    justify-content: center;
}

.donut-chart::before {
    content: '';
    position: absolute;
    width: 120px;
    height: 120px;
    background: var(--bg-surface);
    border-radius: 50%;
}

.donut-center {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 1;
}

.donut-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.donut-label {
    font-size: 12px;
    color: var(--text-secondary);
}

.chart-legend {
    width: 100%;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid #EDF2F7;
}

.legend-item:last-child {
    border-bottom: none;
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-sm);
}

.legend-label {
    flex: 1;
    font-size: 13px;
    color: var(--text-secondary);
}

.legend-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

/* ========================================
   Properties Section
   ======================================== */

.properties-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.property-card {
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

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

.property-image {
    position: relative;
    height: 180px;
    overflow: hidden;
}

.property-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.property-card:hover .property-image img {
    transform: scale(1.05);
}

.property-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 4px 10px;
    border-radius: var(--radius-md);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.property-badge.occupied,
.property-badge.active {
    background: var(--success);
    color: var(--text-white);
}

.property-badge.vacant {
    background: var(--accent);
    color: var(--text-white);
}

.property-badge.maintenance {
    background: var(--danger);
    color: var(--text-white);
}

.property-actions {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.property-card:hover .property-actions {
    opacity: 1;
}

.property-actions button {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    color: var(--text-primary);
}

.property-actions button:hover {
    background: var(--primary);
    color: var(--text-white);
}

.property-content {
    padding: var(--spacing-md);
}

.property-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.property-address {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.property-details {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid #EDF2F7;
}

.property-details span {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--text-secondary);
}

.property-details i {
    font-size: 12px;
    color: var(--primary);
}

.property-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.property-price {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
}

.property-price span {
    font-size: 12px;
    font-weight: 400;
    color: var(--text-secondary);
}

.property-owner {
    font-size: 11px;
    color: var(--text-light);
}

/* ========================================
   Tenants Section
   ======================================== */

.table-container {
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-lg);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead {
    background: var(--bg-main);
}

.data-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid #E2E8F0;
}

.data-table th input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.data-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid #EDF2F7;
    vertical-align: middle;
}

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

.data-table tbody tr:hover {
    background: #F7FAFC;
}

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

.tenant-info img {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.tenant-name {
    display: block;
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
}

.tenant-email {
    display: block;
    font-size: 11px;
    color: var(--text-light);
}

/* Status Badges */
.status-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: var(--radius-md);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

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

.status-badge.pending {
    background: var(--warning-light);
    color: var(--warning);
}

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

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

.action-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-main);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    font-size: 12px;
}

.action-btn.view {
    color: var(--primary);
}

.action-btn.view:hover {
    background: var(--primary);
    color: var(--text-white);
}

.action-btn.edit {
    color: var(--accent);
}

.action-btn.edit:hover {
    background: var(--accent);
    color: var(--text-white);
}

.action-btn.delete {
    color: var(--danger);
}

.action-btn.delete:hover {
    background: var(--danger);
    color: var(--text-white);
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

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

.pagination-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

.pagination-btn {
    width: 36px;
    height: 36px;
    border: 1px solid #E2E8F0;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    font-size: 13px;
    color: var(--text-secondary);
}

.pagination-btn:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
}

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

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

/* ========================================
   Leases Section
   ======================================== */

.leases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.lease-card {
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.lease-card:hover {
    box-shadow: var(--shadow-lg);
}

.lease-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.lease-status {
    padding: 4px 10px;
    border-radius: var(--radius-md);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.lease-status.active {
    background: var(--success-light);
    color: var(--success);
}

.lease-status.expiring {
    background: var(--warning-light);
    color: var(--warning);
}

.lease-status.expired {
    background: var(--danger-light);
    color: var(--danger);
}

.lease-id {
    font-size: 12px;
    color: var(--text-light);
    font-weight: 500;
}

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

.lease-tenant {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid #EDF2F7;
}

.lease-tenant img {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.lease-tenant-name {
    display: block;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.lease-property {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
}

.lease-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.lease-detail {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 12px;
    color: var(--text-secondary);
}

.lease-detail i {
    width: 16px;
    color: var(--primary);
}

.text-warning {
    color: var(--warning) !important;
}

.text-danger {
    color: var(--danger) !important;
}

.lease-footer {
    display: flex;
    gap: var(--spacing-sm);
}

/* ========================================
   Payments Section
   ======================================== */

.payments-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.payment-stat {
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.payment-stat-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

.payment-stat-icon.received {
    background: var(--success-light);
    color: var(--success);
}

.payment-stat-icon.pending {
    background: var(--warning-light);
    color: var(--warning);
}

.payment-stat-icon.overdue {
    background: var(--danger-light);
    color: var(--danger);
}

.payment-stat-label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.payment-stat-value {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

/* ========================================
   Mobile Bottom Navigation
   ======================================== */

.mobile-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 65px;
    background: var(--bg-surface);
    border-top: 1px solid #E2E8F0;
    z-index: 1000;
    padding: 0 var(--spacing-sm);
}

.mobile-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    color: var(--text-light);
    transition: color var(--transition-fast);
    padding: var(--spacing-sm);
}

.mobile-nav-item i {
    font-size: 20px;
}

.mobile-nav-item span {
    font-size: 10px;
    font-weight: 500;
}

.mobile-nav-item.active {
    color: var(--primary);
}

/* Mobile Overlay */
.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

/* ========================================
   Responsive - Tablet (768px - 1023px)
   ======================================== */

@media (max-width: 1023px) {
    :root {
        --sidebar-width: 80px;
    }
    
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .logo span {
        display: none;
    }
    
    .sidebar-nav ul li a span,
    .sidebar-footer a span {
        display: none;
    }
    
    .sidebar-nav ul li a {
        justify-content: center;
        padding: var(--spacing-md);
    }
    
    .sidebar-footer a {
        justify-content: center;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .search-box {
        width: 240px;
    }
    
    .user-info {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .properties-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .leases-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Responsive - Mobile (< 768px)
   ======================================== */

@media (max-width: 767px) {
    .sidebar {
        width: 260px;
    }
    
    .header {
        padding: 0 var(--spacing-md);
    }
    
    .search-box {
        display: none;
    }
    
    .header-btn {
        width: 36px;
        height: 36px;
    }
    
    .user-profile {
        padding: var(--spacing-xs);
    }
    
    .user-profile img {
        width: 32px;
        height: 32px;
    }
    
    .content {
        padding: var(--spacing-md);
        padding-bottom: 80px;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-actions {
        width: 100%;
        flex-wrap: wrap;
    }
    
    .filter-group {
        width: 100%;
        overflow-x: auto;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-card {
        padding: var(--spacing-md);
    }
    
    .stat-value {
        font-size: 24px;
    }
    
    .properties-grid {
        grid-template-columns: 1fr;
    }
    
    .property-image {
        height: 160px;
    }
    
    /* Table responsive */
    .table-container {
        overflow-x: auto;
    }
    
    .data-table {
        min-width: 600px;
    }
    
    .pagination {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .payments-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .mobile-bottom-nav {
        display: flex;
    }
    
    .leases-grid {
        grid-template-columns: 1fr;
    }
    
    .lease-details {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Animations
   ======================================== */

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

.stat-card,
.property-card,
.lease-card,
.payment-stat,
.chart-card {
    animation: fadeIn 0.4s ease-out forwards;
}

.stat-card:nth-child(1) { animation-delay: 0.05s; }
.stat-card:nth-child(2) { animation-delay: 0.1s; }
.stat-card:nth-child(3) { animation-delay: 0.15s; }
.stat-card:nth-child(4) { animation-delay: 0.2s; }

.property-card:nth-child(1) { animation-delay: 0.1s; }
.property-card:nth-child(2) { animation-delay: 0.15s; }
.property-card:nth-child(3) { animation-delay: 0.2s; }
.property-card:nth-child(4) { animation-delay: 0.25s; }
.property-card:nth-child(5) { animation-delay: 0.3s; }
.property-card:nth-child(6) { animation-delay: 0.35s; }

/* ========================================
   Utility Classes
   ======================================== */

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--text-secondary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.hidden { display: none !important; }
.visible { display: block !important; }