:root {
  --primary-color: #2563eb;
  --bg-body: #ffffff;
  --bg-light: #f8fafc;
  /* Main content bg */
  --bg-card: #ffffff;
  --text-main: #374151;
  /* Gray-800 */
  --text-muted: #6b7280;
  --border-color: #e5e7eb;
  --sidebar-bg: #0f172a;
  --sidebar-text: #fff;
  --sidebar-active: #1e293b;
  --input-bg: #ffffff;
}

/* DARK MODE VARIABLES */
body.dark-mode {
  --primary-color: #3b82f6;
  /* Lighter blue for dark mode */
  --bg-body: #0f172a;
  /* Dark background */
  --bg-light: #1e293b;
  /* Slightly lighter for main content */
  --bg-card: #1f2937;
  /* Dark card */
  --text-main: #f3f4f6;
  /* Light text */
  --text-muted: #9ca3af;
  --border-color: #374151;
  /* Dark border */
  --sidebar-bg: #020617;
  /* Even darker sidebar */
  --sidebar-text: #e2e8f0;
  --sidebar-active: #1e293b;
  --input-bg: #374151;
}

html,
body {
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, 'Apple Color Emoji', 'Segoe UI Emoji';
  background-color: var(--bg-body);
  color: var(--text-main);
  transition: background-color 0.3s, color 0.3s;
}

/* Layout */
.main-content {
  background-color: var(--bg-light);
}

.main-content>.container-fluid {
  max-width: 1600px;
  margin: 0 auto;
  padding: 1.5rem;
}

.main-wrapper {
  width: 100%;
  background-color: var(--bg-light);
}

.breadcrumb .breadcrumb-item+.breadcrumb-item::before {
  color: var(--text-muted);
}

/* Sidebar */
.sidebar {
  width: 260px;
  min-height: 100vh;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
}

.sidebar .nav-link {
  color: #cbd5e1;
  border-radius: .5rem;
}

.sidebar .nav-link:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
}

.sidebar .nav-link.active,
.sidebar .nav-link.link-dark.active {
  background: var(--sidebar-active);
  color: #fff;
}

.sidebar .logo-img {
  height: 44px;
  border-radius: .5rem;
}

.sidebar-toggle {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1030;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: .5rem;
  padding: .375rem .5rem;
  color: var(--text-main);
}

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  z-index: 1020;
}

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

/* Cards */
.card {
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-main);
}

.card .card-header {
  border-bottom: 1px solid var(--border-color);
  background-color: transparent !important;
  /* Remove bg-light hardcoding */
  font-weight: 600;
  color: var(--text-main);
}

.stat-card {
  position: relative;
  border-radius: 1rem;
  padding: 1rem;
  color: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.06);
}

.stat-card .card-content h4 {
  font-weight: 600;
  margin-bottom: .25rem;
}

.stat-card .big-number {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.icon-watermark {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  font-size: 3.5rem;
  opacity: .15;
}

.blue-card {
  background-image: linear-gradient(135deg, #4099ff, #3b82f6);
}

.purple-card {
  background-image: linear-gradient(135deg, #8e54e9, #6366f1);
}

.red-card {
  background-image: linear-gradient(135deg, #ef4444, #f97316);
}

.teal-card {
  background-image: linear-gradient(135deg, #06b6d4, #14b8a6);
}

/* Forms */
.form-label {
  font-size: .875rem;
  font-weight: 600;
  color: var(--text-main);
}

.form-control,
.form-select {
  border-color: var(--border-color);
  border-radius: .75rem;
  background-color: var(--input-bg);
  color: var(--text-main);
}

.form-control:focus,
.form-select:focus {
  box-shadow: 0 0 0 .25rem rgba(37, 99, 235, .15);
  border-color: var(--primary-color);
  background-color: var(--input-bg);
  color: var(--text-main);
}

.form-text {
  color: var(--text-muted);
}

/* Buttons */
.btn {
  border-radius: .6rem;
}

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

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

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

.btn-light {
  background-color: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-main);
}

/* Tables */
.table {
  color: var(--text-main);
}

.table thead th {
  font-size: .875rem;
  color: var(--text-muted);
  border-bottom-color: var(--border-color);
}

.table td,
.table th {
  vertical-align: middle;
  border-color: var(--border-color);
}

/* Utilities */
.text-gray-800,
.text-dark {
  color: var(--text-main) !important;
}

.text-muted,
.text-secondary {
  color: var(--text-muted) !important;
}

.bg-white {
  background-color: var(--bg-card) !important;
}

.bg-light {
  background-color: var(--bg-light) !important;
}

.bg-light-primary {
  background: rgba(37, 99, 235, .12);
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 1rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.06);
  color: var(--text-main);
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: .5rem;
  margin-bottom: .5rem;
  border-bottom: 1px solid var(--border-color);
}

.announcement-card {
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: .75rem;
  padding: .75rem;
  color: var(--text-main);
}

.birthday-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.birthday-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
}

.attention-badge {
  font-size: .75rem;
  font-weight: 700;
  border-radius: .5rem;
  padding: .25rem .5rem;
}

.attention-badge.critical {
  background: rgba(239, 68, 68, .15);
  color: #ef4444;
}

.attention-badge.warning {
  background: rgba(245, 158, 11, .15);
  color: #f59e0b;
}

/* Dark Mode Specific Overrides for List Groups */
.list-group-item {
  background-color: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
}

/* Responsive & Flexible Media */
img,
video {
  max-width: 100%;
  height: auto;
}

/* Touch-friendly adjustments */
button,
.btn,
.nav-link,
.form-control,
.form-select {
  touch-action: manipulation;
  /* Improves touch response */
}

/* Responsive Layout Media Queries */
@media (max-width: 991.98px) {

  /* Hide sidebar by default on mobile */
  .sidebar {
    transform: translateX(-100%);
    position: fixed;
    z-index: 1040;
    transition: transform 0.3s ease-in-out;
  }

  /* Show sidebar when active class is added via JS */
  .sidebar.show {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0 !important;
    /* Override any sidebar adjustment */
  }

  .sidebar-overlay {
    background: rgba(0, 0, 0, 0.6);
  }
}

@media print {
  body {
    background: white !important;
    color: black !important;
  }

  .main-content {
    background: #fff;
  }

  .sidebar,
  .dark-mode-toggle {
    display: none;
  }
}