/* -------------------------------------------------------------
   CSS DESIGN SYSTEM: PREMIUM GLASSMORPHISM & DYNAMIC COLOR PALETTE
   ------------------------------------------------------------- */

/* Google Font: Prompt & Mitr integration */
:root {
    /* Fonts */
    --font-primary: 'Prompt', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-secondary: 'Mitr', sans-serif;
    
    /* Layout Sizes */
    --sidebar-width: 260px;
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-premium: 0 8px 32px 0 rgba(0, 0, 0, 0.3);

    /* Dynamic Theme Colors (Default Dark Mode) */
    --bg-app: #090d16;
    --bg-sidebar: rgba(15, 23, 42, 0.65);
    --bg-card: rgba(22, 30, 49, 0.6);
    --bg-card-hover: rgba(30, 41, 67, 0.8);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(99, 102, 241, 0.15);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Status Colors */
    --color-vacant: #10b981;       /* Emerald */
    --color-vacant-bg: rgba(16, 185, 129, 0.12);
    --color-occupied: #8b5cf6;     /* Violet */
    --color-occupied-bg: rgba(139, 92, 246, 0.12);
    --color-maintenance: #f59e0b;  /* Amber */
    --color-maintenance-bg: rgba(245, 158, 11, 0.12);
    --color-unpaid: #f43f5e;       /* Rose (Overdue) */
    --color-unpaid-bg: rgba(244, 63, 94, 0.15);
    
    --color-primary: #6366f1;      /* Indigo Accent */
    --color-primary-hover: #4f46e5;
    --color-primary-bg: rgba(99, 102, 241, 0.15);
}

/* Light Theme Variables Override */
[data-theme="light"] {
    --bg-app: #f1f5f9;
    --bg-sidebar: rgba(255, 255, 255, 0.75);
    --bg-card: rgba(255, 255, 255, 0.8);
    --bg-card-hover: rgba(255, 255, 255, 0.95);
    --border-color: rgba(0, 0, 0, 0.06);
    --border-glow: rgba(99, 102, 241, 0.08);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --shadow-premium: 0 8px 32px 0 rgba(31, 38, 135, 0.06);
    
    --color-vacant-bg: rgba(16, 185, 129, 0.08);
    --color-occupied-bg: rgba(139, 92, 246, 0.08);
    --color-maintenance-bg: rgba(245, 158, 11, 0.08);
    --color-unpaid-bg: rgba(244, 63, 94, 0.08);
}

/* -------------------------------------------------------------
   BASE RESET & LAYOUT
   ------------------------------------------------------------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-primary);
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-app);
    color: var(--text-primary);
    overflow-x: hidden;
    min-height: 100vh;
    transition: background-color 0.4s ease, color 0.4s ease;
}

.app-container {
    display: flex;
    min-height: 100vh;
    position: relative;
}

/* -------------------------------------------------------------
   GLASSMORPHISM UTILITIES
   ------------------------------------------------------------- */
.glass-effect {
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

/* -------------------------------------------------------------
   SIDEBAR NAVIGATION
   ------------------------------------------------------------- */
.sidebar-nav {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-shadow: var(--shadow-premium);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.logo-icon {
    font-size: 2.25rem;
    color: var(--color-primary);
    filter: drop-shadow(0 0 8px var(--color-primary));
}

.brand h2 {
    font-family: var(--font-secondary);
    font-size: 1.35rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #a5b4fc 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex-grow: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1.25rem;
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: var(--border-radius-md);
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.nav-item:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--border-color);
    transform: translateX(3px);
}

.nav-item.active {
    color: var(--text-primary);
    background: var(--color-primary-bg);
    border-color: rgba(99, 102, 241, 0.3);
    font-weight: 500;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.1);
}

.nav-item .material-symbols-outlined {
    font-size: 1.4rem;
}

.sidebar-footer {
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.btn-theme {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-theme:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--color-primary);
}

/* -------------------------------------------------------------
   MAIN CONTENT AREA
   ------------------------------------------------------------- */
.main-content {
    margin-left: var(--sidebar-width);
    flex-grow: 1;
    padding: 2.5rem;
    min-height: 100vh;
    max-width: 1600px;
}

/* Header design */
.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    gap: 2rem;
    flex-wrap: wrap;
}

.header-title h1 {
    font-family: var(--font-secondary);
    font-size: 1.85rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.search-box {
    position: relative;
    width: 300px;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    outline: none;
    transition: var(--transition-smooth);
}

.search-box input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--border-glow);
}

.search-box .material-symbols-outlined {
    position: absolute;
    left: 0.85rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-secondary);
}

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

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: var(--text-secondary);
}

.btn-outline-danger {
    background: transparent;
    color: var(--color-unpaid);
    border: 1px solid rgba(244, 63, 94, 0.3);
}

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

.btn-icon {
    padding: 0.6rem 1rem;
}

.w-100 { width: 100%; }
.flex-1 { flex: 1; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.font-bold { font-weight: 600; }
.text-large { font-size: 1.25rem; }
.text-right { text-align: right; }
.text-center { text-align: center; }

/* -------------------------------------------------------------
   STATS GRID
   ------------------------------------------------------------- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.stat-card {
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    box-shadow: var(--shadow-premium);
    transition: var(--transition-smooth);
}

.stat-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-primary);
    box-shadow: 0 8px 24px var(--border-glow);
}

.stat-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon-wrapper .material-symbols-outlined {
    font-size: 1.75rem;
}

.stat-icon-wrapper.occupied {
    background: var(--color-occupied-bg);
    color: var(--color-occupied);
}

.stat-icon-wrapper.vacant {
    background: var(--color-vacant-bg);
    color: var(--color-vacant);
}

.stat-icon-wrapper.unpaid {
    background: var(--color-unpaid-bg);
    color: var(--color-unpaid);
}

.stat-icon-wrapper.revenue {
    background: var(--color-primary-bg);
    color: var(--color-primary);
}

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

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-info h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 0.15rem;
}

.stat-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
}

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

/* -------------------------------------------------------------
   FILTER & LEGEND BAR
   ------------------------------------------------------------- */
.filter-legend-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    gap: 1.5rem;
    flex-wrap: wrap;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
}

.filter-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.03);
}

.filter-btn.active {
    background: var(--bg-app);
    border-color: var(--border-color);
    color: var(--text-primary);
    font-weight: 500;
}

.badge {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.badge-vacant { background-color: var(--color-vacant); }
.badge-occupied { background-color: var(--color-occupied); }
.badge-unpaid { background-color: var(--color-unpaid); }
.badge-maintenance { background-color: var(--color-maintenance); }

.quick-summary-meter {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.meter-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.meter-progress-container {
    width: 150px;
    height: 8px;
    background: var(--bg-app);
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.meter-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-vacant) 100%);
    border-radius: 4px;
    transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* -------------------------------------------------------------
   BUILDING VISUAL GRID
   ------------------------------------------------------------- */
.building-grid-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.floor-row {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-premium);
    position: relative;
    overflow: hidden;
}

.floor-row::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--color-primary);
}

.floor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.floor-title {
    font-family: var(--font-secondary);
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.floor-stats {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.rooms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.25rem;
}

/* Room Card Design */
.room-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 1.25rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    background: rgba(9, 13, 22, 0.4);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 140px;
    position: relative;
    overflow: hidden;
}

.room-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--text-muted);
    transition: var(--transition-smooth);
}

.room-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.25);
    background: var(--bg-card-hover);
}

/* Room Status Color Themes */
.room-card.status-vacant {
    border-color: rgba(16, 185, 129, 0.2);
}
.room-card.status-vacant::after {
    background: var(--color-vacant);
}
.room-card.status-vacant:hover {
    border-color: var(--color-vacant);
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.15);
}

.room-card.status-occupied {
    border-color: rgba(139, 92, 246, 0.2);
}
.room-card.status-occupied::after {
    background: var(--color-occupied);
}
.room-card.status-occupied:hover {
    border-color: var(--color-occupied);
    box-shadow: 0 8px 20px rgba(139, 92, 246, 0.15);
}

.room-card.status-unpaid {
    border-color: rgba(244, 63, 94, 0.2);
    animation: pulse-border 2.5s infinite alternate;
}
.room-card.status-unpaid::after {
    background: var(--color-unpaid);
}
.room-card.status-unpaid:hover {
    border-color: var(--color-unpaid);
    box-shadow: 0 8px 20px rgba(244, 63, 94, 0.25);
}

@keyframes pulse-border {
    0% { border-color: rgba(244, 63, 94, 0.2); }
    100% { border-color: rgba(244, 63, 94, 0.5); }
}

.room-card.status-maintenance {
    border-color: rgba(245, 158, 11, 0.2);
}
.room-card.status-maintenance::after {
    background: var(--color-maintenance);
}
.room-card.status-maintenance:hover {
    border-color: var(--color-maintenance);
    box-shadow: 0 8px 20px rgba(245, 158, 11, 0.15);
}

/* Room Card Content */
.room-number {
    font-family: var(--font-secondary);
    font-size: 1.35rem;
    font-weight: 500;
    color: var(--text-primary);
}

.room-tenant {
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 0.5rem;
}

.room-info-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.room-rent {
    font-weight: 500;
    color: var(--text-secondary);
}

.room-badge {
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.room-card.status-vacant .room-badge {
    background: var(--color-vacant-bg);
    color: var(--color-vacant);
}
.room-card.status-occupied .room-badge {
    background: var(--color-occupied-bg);
    color: var(--color-occupied);
}
.room-card.status-unpaid .room-badge {
    background: var(--color-unpaid-bg);
    color: var(--color-unpaid);
}
.room-card.status-maintenance .room-badge {
    background: var(--color-maintenance-bg);
    color: var(--color-maintenance);
}

/* Loading & Empty state */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem;
    color: var(--text-muted);
    gap: 1rem;
}

.spin {
    animation: spin 1.5s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* -------------------------------------------------------------
   PANE CONTROLLER (Tabs)
   ------------------------------------------------------------- */
.tab-pane {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* -------------------------------------------------------------
   TABLES & GENERAL DATA DISPLAY
   ------------------------------------------------------------- */
.section-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-premium);
    margin-bottom: 2.5rem;
}

.card-header-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.card-header-actions h3 {
    font-family: var(--font-secondary);
    font-size: 1.35rem;
    font-weight: 500;
}

.filter-group {
    display: flex;
    gap: 0.75rem;
}

.select-input {
    background: var(--bg-app);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.6rem 1rem;
    border-radius: var(--border-radius-md);
    outline: none;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.select-input:focus {
    border-color: var(--color-primary);
}

.table-responsive {
    width: 100%;
    overflow-x: auto;
}

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

.data-table th, .data-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.data-table th {
    background: rgba(0, 0, 0, 0.15);
    color: var(--text-secondary);
    font-weight: 500;
}

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

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.table-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.table-badge.unpaid {
    background: var(--color-unpaid-bg);
    color: var(--color-unpaid);
}

.table-badge.paid {
    background: var(--color-vacant-bg);
    color: var(--color-vacant);
}

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

.settings-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-input {
    background: var(--bg-app);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius-md);
    outline: none;
    transition: var(--transition-smooth);
    font-size: 0.95rem;
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--border-glow);
}

.form-input:disabled, .form-input[readonly] {
    opacity: 0.6;
    background: rgba(0, 0, 0, 0.2);
    cursor: not-allowed;
}

.form-row {
    display: flex;
    gap: 1rem;
}

.col-6 {
    width: 50%;
}

.card-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    line-height: 1.5;
}

.backup-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
}

.import-wrapper {
    display: inline-block;
}

.import-wrapper label {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    cursor: pointer;
}

/* -------------------------------------------------------------
   SIDEBAR SLIDE-OUT PANEL (ROOM DETAILS)
   ------------------------------------------------------------- */
.details-panel {
    position: fixed;
    right: -420px;
    top: 0;
    width: 400px;
    height: 100vh;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-left: 1px solid var(--border-color);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.4);
    z-index: 150;
    transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
}

.details-panel.open {
    right: 0;
}

.panel-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-title-area {
    display: flex;
    align-items: center;
    gap: 1rem;
}

#panel-room-number {
    font-family: var(--font-secondary);
    font-size: 1.5rem;
    font-weight: 500;
}

.room-status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.btn-close-panel {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.btn-close-panel:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.panel-content {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

/* Sidebar Tab switcher */
.panel-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--border-radius-sm);
    padding: 2px;
}

.panel-tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.6rem 0.25rem;
    font-size: 0.85rem;
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition-smooth);
}

.panel-tab-btn.active {
    background: var(--bg-card);
    color: var(--text-primary);
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.panel-tab-content {
    display: none;
}

.panel-tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.panel-divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 1.5rem 0;
}

.panel-section-title {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* Utility calculator inside Sidebar */
.bill-utility-section {
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 1.25rem;
}

.bill-utility-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.icon-inline {
    font-size: 1.1rem;
}

.utility-calc-summary {
    display: flex;
    justify-content: space-between;
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.utility-calc-summary strong {
    color: var(--text-primary);
}

.bill-total-summary {
    background: var(--color-primary-bg);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--border-radius-md);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.bill-summary-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.bill-summary-row.highlight {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 0.5rem;
    margin-top: 0.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.panel-action-row {
    display: flex;
    gap: 1rem;
}

.empty-state-illust {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2.5rem;
    color: var(--text-muted);
    text-align: center;
    gap: 0.75rem;
}

.empty-state-illust .material-symbols-outlined {
    font-size: 3rem;
}

.empty-state-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Billing Item Card inside Sidebar */
.bill-item-card {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 1rem;
    margin-bottom: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.bill-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.bill-item-month {
    font-weight: 500;
    font-size: 0.95rem;
}

.bill-item-details {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
}

.bill-item-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 0.25rem;
    border-top: 1px solid var(--border-color);
    padding-top: 0.5rem;
}

.btn-small {
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
    border-radius: 4px;
}

/* -------------------------------------------------------------
   MODALS DEFINITION (POP-UP)
   ------------------------------------------------------------- */
.modal {
    position: fixed;
    left: 0;
    top: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal.open {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: var(--bg-sidebar);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    animation: zoomIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.15);
}

.modal-content.modal-large {
    max-width: 900px;
}

.modal-content.modal-print {
    max-width: 800px;
    background: #ffffff;
    color: #1e293b;
    border-radius: 0;
}

@keyframes zoomIn {
    from { transform: scale(0.92); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-family: var(--font-secondary);
    font-size: 1.35rem;
    font-weight: 500;
}

.btn-close-modal {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-close-modal:hover {
    background: rgba(255, 255, 255, 0.05);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
}

.modal-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.5;
}

.modal-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* -------------------------------------------------------------
   PRINTABLE INVOICE STYLING
   ------------------------------------------------------------- */
.invoice-box {
    padding: 2.5rem;
    background: #ffffff;
    color: #1e293b;
}

.invoice-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.invoice-company h2 {
    font-family: var(--font-secondary);
    font-size: 1.4rem;
    font-weight: 500;
    color: #0f172a;
}

.invoice-company p {
    font-size: 0.85rem;
    color: #64748b;
    margin-top: 0.25rem;
}

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

.invoice-meta h3 {
    font-family: var(--font-secondary);
    font-size: 1.5rem;
    color: var(--color-primary);
}

.invoice-meta p {
    font-size: 0.85rem;
    color: #475569;
    margin-top: 0.35rem;
}

.invoice-line {
    border: none;
    border-top: 2px solid #e2e8f0;
    margin-bottom: 1.5rem;
}

.invoice-details {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.invoice-detail-col h4 {
    font-size: 0.95rem;
    color: #475569;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.invoice-detail-col p {
    font-size: 0.85rem;
    color: #1e293b;
    margin-bottom: 0.25rem;
}

.invoice-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2.5rem;
}

.invoice-table th, .invoice-table td {
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
    border-bottom: 1px solid #e2e8f0;
}

.invoice-table th {
    background: #f8fafc;
    color: #475569;
    font-weight: 600;
    text-align: left;
}

.invoice-table th.text-right, .invoice-table td.text-right {
    text-align: right;
}

.grand-total-row td {
    border-top: 2px solid #0f172a;
    border-bottom: 2px double #0f172a;
    padding: 1rem;
}

.invoice-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-top: 3rem;
}

.signature-section {
    width: 200px;
    text-align: center;
}

.signature-line {
    border-bottom: 1px solid #94a3b8;
    margin-bottom: 0.5rem;
    height: 40px;
}

.signature-section p {
    font-size: 0.8rem;
    color: #64748b;
}

.payment-notes {
    max-width: 400px;
    font-size: 0.75rem;
    color: #64748b;
    line-height: 1.5;
}

/* -------------------------------------------------------------
   PRINT MEDIA RULES
   ------------------------------------------------------------- */
@media print {
    body * {
        visibility: hidden;
    }
    
    #modal-invoice-print.open, #modal-invoice-print.open .modal-content, #printable-invoice, #printable-invoice *,
    #modal-contract-print.open, #modal-contract-print.open .modal-content, #printable-contract, #printable-contract * {
        visibility: visible;
    }
    
    #modal-invoice-print.open, #modal-contract-print.open {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: auto;
        background: transparent;
        backdrop-filter: none;
        box-shadow: none;
        opacity: 1 !important;
        pointer-events: none;
        display: block !important;
    }

    #modal-invoice-print.open .modal-content, #modal-contract-print.open .modal-content {
        width: 100%;
        max-width: 100%;
        box-shadow: none;
        border: none;
        overflow: visible;
        margin: 0;
        padding: 0;
        background: white;
    }
    
    #modal-invoice-print:not(.open), #modal-contract-print:not(.open) {
        display: none !important;
    }
    
    .no-print {
        display: none !important;
    }
    
    .invoice-box {
        padding: 0;
        margin: 0;
        width: 100%;
    }
}

/* -------------------------------------------------------------
   RESPONSIVE DESIGN (MOBILE ADAPTATION)
   ------------------------------------------------------------- */
@media (max-width: 1024px) {
    .sidebar-nav {
        width: 72px;
        padding: 1.5rem 0.5rem;
        align-items: center;
    }
    
    .brand h2, .theme-text {
        display: none;
    }
    
    .logo-icon {
        font-size: 2rem;
    }
    
    .nav-item span:not(.material-symbols-outlined) {
        display: none;
    }
    
    .nav-item {
        justify-content: center;
        padding: 0.85rem;
    }
    
    .main-content {
        margin-left: 72px;
        padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    .content-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .search-box {
        width: 100%;
    }
    
    .header-actions {
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-actions .btn {
        width: 100%;
    }
    
    .filter-legend-bar {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .settings-grid {
        grid-template-columns: 1fr;
    }
    
    .details-panel {
        width: 100%;
        right: -100%;
    }
}

/* -------------------------------------------------------------
   FIREBASE SYNC BANNER & TOOLTIP STYLES
   ------------------------------------------------------------- */
.status-banner {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.25rem;
    border-radius: var(--border-radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid transparent;
    transition: var(--transition-smooth);
}

.status-banner .status-icon {
    font-size: 1.25rem;
}

.status-banner.offline {
    background: rgba(100, 116, 139, 0.08);
    border-color: rgba(100, 116, 139, 0.2);
    color: var(--text-secondary);
}

.status-banner.connecting {
    background: rgba(245, 158, 11, 0.08);
    border-color: rgba(245, 158, 11, 0.2);
    color: var(--color-maintenance);
}

.status-banner.connected {
    background: rgba(16, 185, 129, 0.08);
    border-color: rgba(16, 185, 129, 0.2);
    color: var(--color-vacant);
}

.status-banner.error {
    background: rgba(244, 63, 94, 0.08);
    border-color: rgba(244, 63, 94, 0.2);
    color: var(--color-unpaid);
}

.input-tip {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
    display: block;
}

/* -------------------------------------------------------------
   DIGITAL SIGNATURE PAD & PLACEHOLDERS
   ------------------------------------------------------------- */
.signature-box {
    transition: var(--transition-smooth);
    border: 1px dashed var(--text-muted) !important;
    background: rgba(255, 255, 255, 0.02) !important;
}

[data-theme="light"] .signature-box {
    background: rgba(0, 0, 0, 0.02) !important;
    border: 1px dashed #cbd5e1 !important;
}

.signature-box:hover {
    border-color: var(--color-primary) !important;
    background: var(--color-primary-bg) !important;
}

.signature-box img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* Print styles adjustment for signature boxes */
@media print {
    .signature-box {
        border: none !important;
        background: transparent !important;
        height: 60px !important;
        width: 150px !important;
    }
    .signature-box img {
        display: block !important;
        max-height: 60px !important;
        width: auto !important;
        margin: 0 auto;
        filter: contrast(1.5) brightness(0.9); /* make black lines sharper for printing */
    }
    .signature-box .placeholder-text {
        display: none !important;
    }
}

/* -------------------------------------------------------------
   LEASE NOTIFICATIONS & WARNINGS
   ------------------------------------------------------------- */
.alert-card {
    transition: var(--transition-smooth);
}

.alert-item {
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius-sm);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
}

[data-theme="light"] .alert-item {
    background: rgba(0, 0, 0, 0.02);
}

.alert-item.expired {
    color: var(--color-unpaid);
    border-color: rgba(244, 63, 94, 0.2);
    background: rgba(244, 63, 94, 0.03);
}

.alert-item.expiring {
    color: var(--color-maintenance);
    border-color: rgba(245, 158, 11, 0.2);
    background: rgba(245, 158, 11, 0.03);
}

.alert-item .material-symbols-outlined {
    font-size: 1.2rem;
}