:root {
  --primary-color: #4361ee;
  --primary-light: #4895ef;
  --secondary-color: #3f37c9;
  --success-color: #4cc9f0;
  --success-dark: #00b4d8;
  --warning-color: #f72585;
  --text-main: #2b2d42;
  --text-muted: #8d99ae;
  --bg-main: #f8f9fa;
  --bg-card: #ffffff;
  --border-color: #e9ecef;
  --sidebar-bg: #1a1b41;
  --sidebar-text: #e0e1dd;
  --sidebar-active: #4361ee;
  
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
  
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  overflow-x: hidden;
}

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

/* Sidebar */
.sidebar {
  width: 260px;
  background-color: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-md);
  z-index: 10;
}

.sidebar-header {
  padding: 24px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  color: #fff;
}

.logo h2 {
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.4;
}

.logo img {
  border-radius: 8px;
  background-color: #ffffff;
  padding: 4px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.2);
}

.nav-links {
  list-style: none;
  padding: 20px 0;
  flex: 1;
}

.nav-links li {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
  color: rgba(255,255,255,0.7);
}

.nav-links li:hover {
  background-color: rgba(255,255,255,0.05);
  color: #fff;
}

.nav-links li.active {
  background-color: var(--sidebar-active);
  color: #fff;
  border-left: 4px solid var(--success-color);
}

.nav-links li i {
  font-size: 1.4rem;
}

.sidebar-footer {
  padding: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  border-top: 1px solid rgba(255,255,255,0.1);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.top-header {
  padding: 20px 30px;
  background-color: var(--bg-card);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 15px;
  box-shadow: var(--shadow-sm);
  z-index: 5;
}

.top-header h1 {
  font-size: 2rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary-color);
  text-align: center;
  letter-spacing: 1px;
}

.date-selector {
  display: flex;
  align-items: center;
  gap: 12px;
}

.date-selector label {
  font-weight: 500;
  color: var(--text-muted);
}

.date-selector input {
  padding: 8px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  outline: none;
  transition: var(--transition);
}

.date-selector input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
}

/* Tabs */
.tab-pane {
  display: none;
  padding: 30px;
  flex: 1;
  overflow-y: auto;
  scroll-margin-top: 150px;
}

.tab-pane.active {
  display: block;
  animation: fadeIn 0.4s ease forwards;
}

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

/* Cards */
.card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
  overflow: hidden;
}

.card-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
}

.card-body {
  padding: 24px;
}

/* Tables */
.table-container {
  overflow: auto;
  width: 100%;
  max-height: calc(100vh - 180px);
}

.data-table {
  width: 100%;
  border-collapse: separate; /* Required for sticky borders to look perfect */
  border-spacing: 0;
  white-space: nowrap;
}

#table-error-time, #table-error-other {
  table-layout: fixed;
}

#table-error-time th, #table-error-time td,
#table-error-other th, #table-error-other td {
  white-space: normal;
  word-wrap: break-word;
}


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

.data-table th {
  background-color: #f8f9fc;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  position: sticky;
  top: 0;
  z-index: 10;
  border-top: 1px solid var(--border-color);
}


.data-table tr.total-row td {
  background-color: #f8f9fc;
}

.data-table thead tr:first-child th:first-child,
.data-table tbody td:first-child {
  position: sticky;
  left: 0;
  z-index: 5;
  border-right: 1px solid var(--border-color);
}

.data-table thead tr:first-child th:first-child {
  z-index: 15;
}

.data-table thead tr:first-child th:last-child,
.data-table tbody td:last-child {
  position: sticky;
  right: 0;
  z-index: 5;
  border-left: 1px solid var(--border-color);
}

.data-table thead tr:first-child th:last-child {
  z-index: 15;
}

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

.data-table tbody tr:hover td {
  background-color: #f4f6fe;
}

.data-table tbody tr:hover td.bg-holiday {
  background-color: #fff0b3 !important;
}

.bg-holiday {
  background-color: #fff9c4 !important;
}

.text-center {
  text-align: center !important;
}

/* Form Controls in Table */
.cell-checkbox-group {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 4px;
  font-size: 0.85rem;
  padding: 4px 8px;
  border-radius: 6px;
  transition: var(--transition);
  border: 1px solid transparent;
  min-width: 70px;
}

.cell-checkbox-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  margin: 0;
  user-select: none;
}

.cell-checkbox-group input[type="checkbox"] {
  cursor: pointer;
  width: 14px;
  height: 14px;
  accent-color: var(--primary-color);
}

.cell-checkbox-group.val-sang { background-color: rgba(76, 201, 240, 0.15); color: var(--success-dark); font-weight: 500; border-color: rgba(76, 201, 240, 0.4); }
.cell-checkbox-group.val-chieu { background-color: rgba(247, 37, 133, 0.15); color: var(--warning-color); font-weight: 500; border-color: rgba(247, 37, 133, 0.4); }
.cell-checkbox-group.val-ca-ngay { background-color: rgba(67, 97, 238, 0.15); color: var(--primary-color); font-weight: 600; border-color: rgba(67, 97, 238, 0.4); }

/* Upload Area */
.upload-area {
  border: 2px dashed var(--primary-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  background-color: rgba(72, 149, 239, 0.03);
  transition: var(--transition);
  margin-bottom: 24px;
}

.upload-area:hover {
  background-color: rgba(72, 149, 239, 0.08);
}

.upload-icon {
  font-size: 4rem;
  color: var(--primary-color);
  margin-bottom: 16px;
}

.upload-area p {
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
}

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

.btn-primary:hover {
  background-color: var(--secondary-color);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

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

.btn-success:hover {
  background-color: #0096c7;
  transform: translateY(-1px);
}

.btn-danger {
  background-color: #ef233c;
  color: #fff;
  padding: 6px 12px;
}

.btn-danger:hover {
  background-color: #d90429;
}

/* Inputs */
.input-field {
  padding: 10px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: inherit;
  outline: none;
  background-color: var(--bg-card);
  color: var(--text-main);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

select.input-field {
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238d99ae' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 1em;
  padding-right: 30px;
}

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

/* Utilities */
.hidden {
  display: none !important;
}

/* Sync Status Popup */
.sync-status-popup {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-50px);
  padding: 8px 16px;
  border-radius: 20px;
  font-weight: 500;
  font-size: 0.9rem;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}

.sync-status-popup.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  visibility: visible;
}

.sync-status-popup.saving {
  background-color: #fffbeb;
  color: #b45309;
  border: 1px solid #fde68a;
}

.sync-status-popup.error {
  background-color: #fef2f2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}

.sync-status-popup.success {
  background-color: #f0fdf4;
  color: #15803d;
  border: 1px solid #bbf7d0;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--text-main);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-weight: 500;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  z-index: 1000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255,255,255,0.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  backdrop-filter: blur(4px);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(67, 97, 238, 0.2);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 16px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 12px;
  font-style: italic;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10000;
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.modal-overlay.show {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  width: 400px;
  max-width: 90%;
  box-shadow: var(--shadow-lg);
  transform: scale(0.9);
  transition: all 0.3s ease;
  overflow: hidden;
}

.modal-overlay.show .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-header i {
  font-size: 1.8rem;
  color: var(--warning-color);
}

.modal-header h3 {
  font-size: 1.2rem;
  font-weight: 600;
}

.modal-body {
  padding: 24px 20px;
  font-size: 1rem;
  color: var(--text-main);
}

.modal-footer {
  padding: 16px 20px;
  background-color: #f8f9fa;
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

.btn-secondary {
  background-color: #e9ecef;
  color: var(--text-main);
}

.btn-secondary:hover {
  background-color: #dee2e6;
}

.thuthuat-input {
  width: 60px;
  padding: 4px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  text-align: center;
  font-family: inherit;
  font-size: 14px;
  color: var(--text-main);
  background-color: transparent;
  transition: var(--transition);
}

.thuthuat-input:focus {
  outline: none;
  border-color: var(--primary-color);
  background-color: var(--bg-card);
  box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

.thuthuat-input::-webkit-outer-spin-button,
.thuthuat-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.thuthuat-input[type=number] {
  -moz-appearance: textfield;
}

/* --- DARK MODE --- */
body.dark-mode {
  --primary-color: #4895ef;
  --text-main: #f8f9fa;
  --text-muted: #adb5bd;
  --bg-main: #121212;
  --bg-card: #1e1e1e;
  --border-color: #333333;
  --sidebar-bg: #000000;
  --sidebar-text: #e0e1dd;
}

body.dark-mode .card {
  box-shadow: 0 4px 10px rgba(0,0,0,0.5);
}

body.dark-mode .data-table th {
  background-color: #2a2a2a;
  color: #fff;
  border-bottom-color: #444;
}

body.dark-mode .data-table td {
  background-color: var(--bg-card);
  color: var(--text-main);
  border-bottom-color: #333;
}

body.dark-mode .data-table tr:hover td {
  background-color: #2a2a2a;
}

body.dark-mode .input-field {
  background-color: #2a2a2a;
  color: #fff;
  border-color: #444;
}

body.dark-mode .thuthuat-input {
  color: #fff;
}

body.dark-mode .btn-secondary {
  background-color: #333;
  color: #fff;
}
body.dark-mode .btn-secondary:hover {
  background-color: #444;
}

body.dark-mode .data-table tr.total-row td {
  background-color: #2a2a2a !important;
}

body.dark-mode .bg-holiday {
  background-color: #2c2918 !important; /* Màu vàng tối */
}

body.dark-mode .data-table tbody tr:hover td.bg-holiday {
  background-color: #3d3922 !important; /* Vàng tối hơn một chút khi hover */
}

body.dark-mode .toast {
  background-color: #333;
  color: #fff;
  border: 1px solid #444;
}

/* --- RESPONSIVE DESIGN (MOBILE / TABLET) --- */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  font-size: 2rem;
  color: var(--primary-color);
  cursor: pointer;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 900;
  backdrop-filter: blur(2px);
  transition: opacity 0.3s ease;
  opacity: 0;
}

.sidebar-overlay.show {
  display: block;
  opacity: 1;
}

@media (max-width: 768px) {
  .app-container {
    flex-direction: column;
  }
  
  .sidebar {
    position: fixed;
    top: 0;
    left: -280px;
    height: 100vh;
    width: 260px;
    z-index: 1000;
    transition: left 0.3s ease;
  }
  
  .sidebar.show {
    left: 0;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  /* --- FIX HEADER --- */
  .top-header {
    padding: 15px !important;
    gap: 15px;
  }
  
  .top-header > div:first-child {
    width: 100%;
    justify-content: flex-start !important;
  }

  .top-header h1 {
    font-size: 1.3rem !important;
    margin-left: 10px;
  }
  
  .header-actions {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start !important;
    gap: 10px !important;
  }
  
  .date-selector {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start !important;
  }

  /* --- FIX CÁC NÚT THÊM/XÓA/XUẤT TRÊN HEADER --- */
  #top-add-employee, #top-audit-actions, #top-quy-actions, #top-thuthuat-actions {
    width: 100% !important;
    flex-direction: column !important;
  }

  #top-add-employee input, 
  #top-add-employee button,
  #top-audit-actions button, 
  #top-quy-actions button,
  #top-thuthuat-actions button,
  #btn-export-excel,
  #excel-file-input + button {
    width: 100% !important;
    justify-content: center;
  }
  
  .app-container {
    flex-direction: column;
    width: 100vw;
    overflow-x: hidden;
  }

  .main-content {
    height: auto;
    min-height: 100vh;
    width: 100vw;
    max-width: 100vw;
    overflow-x: hidden;
  }

  canvas {
    max-width: 100% !important;
    height: auto !important;
  }
  
  .tab-pane {
    padding: 10px !important;
  }
  
  .card {
    margin-bottom: 15px;
  }

  /* --- FIX CÁC FORM BỊ TRÀN DO INLINE CSS (TAB QUỸ, CÀI ĐẶT) --- */
  /* Ép các flexbox đang nằm ngang thành nằm dọc */
  div[style*="display: flex; flex-wrap: wrap"],
  #tab-caidat div[style*="display: flex; gap: 20px"] {
    flex-direction: column !important;
    align-items: stretch !important;
  }

  div[style*="flex: 1"], 
  div[style*="flex: 1.5"], 
  div[style*="flex: 2"] {
    width: 100% !important;
    min-width: 100% !important;
  }

  #backup-type {
    width: 100% !important;
  }

  /* Xóa thanh gạch dọc trong tab cài đặt trên mobile */
  #tab-caidat div[style*="width: 1px; height: 40px"] {
    display: none !important;
  }

  /* --- BẢNG (TABLE) --- */
  .card-body th, .card-body td, .data-table th, .data-table td {
    padding: 8px 10px;
    white-space: nowrap; /* Không cho chữ xuống dòng làm méo bảng */
  }

  .card-body {
    padding: 12px 15px !important;
  }

  .card-header {
    flex-direction: column;
    align-items: flex-start !important;
    gap: 10px !important;
    padding: 12px 15px !important;
  }
  
  .card-header > div {
    flex-wrap: wrap;
    width: 100%;
    gap: 8px !important;
  }
  
  .card-header h3 {
    margin-bottom: 5px !important;
  }

  .table-container {
    overflow-x: auto; /* Kéo ngang bảng trên điện thoại */
    -webkit-overflow-scrolling: touch;
  }
}

/* Badge styles for Skills & Systems */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  text-align: center;
}
.badge-phcn {
  background-color: rgba(76, 201, 240, 0.15);
  color: #00b4d8;
  border: 1px solid rgba(76, 201, 240, 0.3);
}
.badge-yhct {
  background-color: rgba(247, 37, 133, 0.15);
  color: #f72585;
  border: 1px solid rgba(247, 37, 133, 0.3);
}
.badge-both {
  background-color: rgba(67, 97, 238, 0.15);
  color: #4361ee;
  border: 1px solid rgba(67, 97, 238, 0.3);
}

body.dark-mode .badge-phcn {
  background-color: rgba(76, 201, 240, 0.25);
  color: #4cc9f0;
}
body.dark-mode .badge-yhct {
  background-color: rgba(247, 37, 133, 0.25);
  color: #ff5d9e;
}
body.dark-mode .badge-both {
  background-color: rgba(67, 97, 238, 0.25);
  color: #7289da;
}

/* Drag & Drop Reordering Styles */
.drag-handle {
  cursor: grab;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  padding: 4px;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.drag-handle:hover {
  color: var(--primary-color);
  background-color: rgba(59, 130, 246, 0.1);
}

.drag-handle:active {
  cursor: grabbing;
}

tr.dragging {
  opacity: 0.5;
  background-color: var(--bg-hover) !important;
  outline: 2px dashed var(--primary-color);
  outline-offset: -2px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

body.dark-mode tr.dragging {
  background-color: rgba(255, 255, 255, 0.05) !important;
  outline: 2px dashed var(--primary-color);
}

.badge-heso {
  background-color: rgba(107, 114, 128, 0.12);
  color: #6b7280;
  border: 1px solid rgba(107, 114, 128, 0.25);
}

body.dark-mode .badge-heso {
  background-color: rgba(156, 163, 175, 0.2);
  color: #d1d5db;
  border: 1px solid rgba(156, 163, 175, 0.3);
}