/* ================================================================================
   CMS QUẢN LÝ NHÀ TRỌ 868 - DESIGN SYSTEM & MOBILE / TABLET RESPONSIVE STYLES
   ================================================================================ */

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #334155;
  --bg-card-hover: #475569;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #475569;

  --accent-primary: #38bdf8;
  --accent-success: #34d399;
  --accent-warning: #fbbf24;
  --accent-danger: #f87171;
  --accent-info: #818cf8;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

/* Light Theme Variables Override */
body.light-theme {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;

  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
}

/* Layout Wrapper */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Mobile Top Bar (Hidden on Desktop) */
.mobile-header-bar {
  display: none;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 16px;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
}

.mobile-header-bar .mobile-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  color: var(--accent-primary);
}

.btn-mobile-hamburger {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 18px;
  cursor: pointer;
}

/* Sidebar Navigation */
.sidebar {
  width: 260px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: all 0.3s ease;
  z-index: 99;
}

.sidebar-header {
  padding: 24px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-info));
  color: #fff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.logo-text h2 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.logo-text span {
  font-size: 11px;
  color: var(--text-muted);
}

.sidebar-menu {
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s ease;
}

.nav-item:hover {
  background-color: var(--bg-card);
  color: var(--text-main);
}

.nav-item.active {
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.15), transparent);
  color: var(--accent-primary);
  border-left: 3px solid var(--accent-primary);
  font-weight: 600;
}

.nav-item i {
  font-size: 16px;
  width: 20px;
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color);
}

.building-info {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.btn-theme-toggle {
  width: 100%;
  padding: 10px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

/* Main Content Area */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow-x: hidden;
}

.top-header {
  padding: 20px 30px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.header-title h1 {
  font-size: 20px;
  font-weight: 700;
}

.header-title .sub-title {
  font-size: 12px;
  color: var(--text-muted);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.search-box {
  position: relative;
}

.search-box i {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 14px;
}

.search-box input {
  padding: 8px 12px 8px 36px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: var(--radius-sm);
  font-size: 13px;
  width: 220px;
}

.month-selector {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: var(--bg-primary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.month-selector select {
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

/* Content Body & Tab Pages */
.content-body {
  padding: 30px;
  flex: 1;
}

.tab-page {
  display: none;
}

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

/* UI Cards & Panels */
.card-panel {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 24px;
  box-shadow: var(--shadow-md);
  margin-bottom: 24px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.panel-header h3 {
  font-size: 16px;
  font-weight: 700;
}

.panel-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Buttons */
.btn {
  padding: 9px 16px;
  border-radius: var(--radius-sm);
  border: none;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
}

.btn-primary { background-color: #0284c7; color: #fff; }
.btn-primary:hover { background-color: #0369a1; }
.btn-success { background-color: #059669; color: #fff; }
.btn-success:hover { background-color: #047857; }
.btn-warning { background-color: #d97706; color: #fff; }
.btn-warning:hover { background-color: #b45309; }
.btn-danger { background-color: #dc2626; color: #fff; }
.btn-danger:hover { background-color: #b91c1c; }
.btn-secondary { background-color: var(--bg-card); color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background-color: var(--bg-card-hover); }
.btn-info { background-color: #4f46e5; color: #fff; }
.btn-info:hover { background-color: #4338ca; }
.btn-zalo { background-color: #0068ff; color: #fff; }

/* KPI Grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.kpi-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.kpi-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.card-revenue .kpi-icon { background: rgba(56, 189, 248, 0.15); color: var(--accent-primary); }
.card-expenses .kpi-icon { background: rgba(248, 113, 113, 0.15); color: var(--accent-danger); }
.card-profit .kpi-icon { background: rgba(52, 211, 153, 0.15); color: var(--accent-success); }
.card-occupancy .kpi-icon { background: rgba(251, 191, 36, 0.15); color: var(--accent-warning); }

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

.kpi-label { font-size: 12px; color: var(--text-muted); }
.kpi-info h3 { font-size: 20px; font-weight: 700; margin: 4px 0; }
.kpi-desc { font-size: 11px; color: var(--text-muted); }

/* Grid Sheet Table */
.grid-sheet-container {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.grid-sheet-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  white-space: nowrap;
}

.grid-sheet-table th, .grid-sheet-table td {
  border: 1px solid var(--border-color);
  padding: 8px 10px;
}

.grid-sheet-table th {
  background-color: var(--bg-card);
  font-weight: 600;
  text-align: center;
  position: sticky;
  top: 0;
}

.input-grid {
  width: 100%;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-main);
  padding: 4px 6px;
  border-radius: 4px;
  font-size: 13px;
}

.input-grid:focus {
  background-color: var(--bg-primary);
  border-color: var(--accent-primary);
  outline: none;
}

.row-total { background: rgba(56, 189, 248, 0.1); font-weight: 700; }
.row-expense { background: rgba(248, 113, 113, 0.1); font-weight: 700; }
.row-profit { background: rgba(52, 211, 153, 0.15); font-weight: 700; }

/* DRAG AND DROP ROW STYLES */
.drag-handle {
  cursor: grab;
  color: var(--accent-warning);
  padding: 4px;
  font-size: 14px;
  user-select: none;
}
.drag-handle:active {
  cursor: grabbing;
}
tr.dragging {
  opacity: 0.35;
  background-color: var(--bg-card-hover) !important;
}
tr.drag-over-top {
  border-top: 3px solid var(--accent-primary) !important;
}
tr.drag-over-bottom {
  border-bottom: 3px solid var(--accent-primary) !important;
}

/* Filter & Sort Bar */
.filter-sort-bar {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: var(--bg-card);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.filter-group select {
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 13px;
}

/* Room Cards Grid */
.floor-title {
  font-size: 15px;
  font-weight: 700;
  margin: 16px 0 10px 0;
  color: var(--accent-primary);
}

.rooms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.room-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.room-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-lg);
}

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

.room-name { font-size: 16px; font-weight: 700; }

.badge {
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
}

.badge-success { background: rgba(52, 211, 153, 0.2); color: var(--accent-success); }
.badge-danger { background: rgba(248, 113, 113, 0.2); color: var(--accent-danger); }
.badge-warning { background: rgba(251, 191, 36, 0.2); color: var(--accent-warning); }
.badge-info { background: rgba(129, 140, 248, 0.2); color: var(--accent-info); }
.badge-secondary { background: rgba(148, 163, 184, 0.2); color: var(--text-muted); }

/* Invoices Cards */
.invoices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.invoice-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.invoice-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
}

.vietqr-box {
  background-color: #ffffff;
  color: #000;
  border-radius: var(--radius-md);
  padding: 12px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.vietqr-box img {
  width: 140px;
  height: 140px;
  object-fit: contain;
}

/* CCCD Photo Preview & Viewer Styles */
.cccd-preview-box {
  width: 100%;
  height: 110px;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

.cccd-viewer-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.cccd-card-view {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.cccd-card-view h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-primary);
}

.cccd-img-wrapper {
  width: 100%;
  height: 220px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
}

.cccd-img-wrapper img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.cccd-img-wrapper img:hover {
  transform: scale(1.15);
}

/* Modals */
.modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal.active {
  display: flex;
}

.modal-content {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 24px;
}

.modal-lg { max-width: 900px; }

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group.full-width { grid-column: span 2; }

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-muted);
}

.form-group input, .form-group select {
  width: 100%;
  padding: 10px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: var(--radius-sm);
  font-size: 13px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* Styled Table */
.styled-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

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

.styled-table th {
  text-align: left;
  color: var(--text-muted);
  font-weight: 600;
}

/* ================================================================================
   RESPONSIVE DESIGN (TABLET & MOBILE)
   ================================================================================ */

/* TABLET (768px - 1024px) */
@media (max-width: 1024px) {
  .sidebar {
    width: 220px;
  }
  .content-body {
    padding: 20px;
  }
  .kpi-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .rooms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* MOBILE (< 768px) */
@media (max-width: 768px) {
  .mobile-header-bar {
    display: flex;
  }

  .sidebar {
    position: fixed;
    top: 54px;
    left: -260px;
    bottom: 0;
    width: 260px;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.mobile-open {
    left: 0;
  }

  .top-header {
    padding: 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .header-controls {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .search-box input {
    width: 100%;
  }

  .content-body {
    padding: 14px;
  }

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

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

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

  .cccd-viewer-container {
    grid-template-columns: 1fr;
  }

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

  .form-group.full-width {
    grid-column: span 1;
  }

  .table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}