:root {
  --primary-color: #0d6efd;
  --primary-hover: #0b5ed7;
  --secondary-color: #6c757d;
  --success-color: #198754;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  --info-color: #0dcaf0;
  --light-color: #f8f9fa;
  --dark-color: #212529;
  --status-pending: #fff3cd;
  --status-in-progress: #d1ecf1;
  --status-completed: #d4edda;
  --status-overdue: #f8d7da;
  --priority-low: var(--success-color);
  --priority-medium: var(--warning-color);
  --priority-high: var(--danger-color);
  --priority-urgent: var(--dark-color);
  --border-radius: 0.375rem;
  --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --box-shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --box-shadow-lg: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --transition-base: all 0.15s ease-in-out;
  --transition-fast: all 0.1s ease-in-out;
  --transition-slow: all 0.3s ease-in-out;
}

* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  background-color: #fff;
  color: #212529;
}

.visually-hidden-focusable {
  position: absolute !important;
  left: -9999px !important;
  top: 0.5rem !important;
  z-index: 999999 !important;

  display: inline-block !important;
  padding: 0.5rem 0.9rem !important;

  background: #ffffff !important;
  color: #0d6efd !important;
  border: 2px solid #0d6efd !important;
  border-radius: 0.25rem !important;

  text-decoration: none !important;
  font-weight: 600 !important;

  width: auto !important;
  height: auto !important;

  clip: auto !important;
  clip-path: none !important;
  white-space: normal !important;
  overflow: visible !important;

  opacity: 1 !important;
  pointer-events: auto !important;
}

.visually-hidden-focusable:hover,
.visually-hidden-focusable:focus {
  text-decoration: underline !important;
  outline: none !important;
}

.visually-hidden-focusable:focus {
  position: fixed !important;
  left: 0.5rem !important;
  top: 0.5rem !important;
}

.navbar {
  position: relative;
  z-index: 1040;
}

.btn:focus,
.form-control:focus,
.form-select:focus,
.form-check-input:focus {
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
  outline: 0;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.5rem;
  transition: var(--transition-fast);
}

.navbar-brand:hover {
  transform: translateY(-1px);
}

.navbar-nav .nav-link {
  position: relative;
  transition: var(--transition-fast);
}

.navbar-nav .nav-link:hover {
  transform: translateY(-1px);
}

.navbar-dark .navbar-nav .nav-link {
  color: #ffffff;
}

.navbar-dark .navbar-nav .nav-link.active,
.navbar-dark .navbar-nav .show > .nav-link {
  color: #ffffff;
}

.navbar-dark .navbar-nav .nav-link:hover,
.navbar-dark .navbar-nav .nav-link:focus {
  color: #f8f9fa;
  text-decoration: underline;
}

.card {
  border: 1px solid rgba(0, 0, 0, 0.125);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-sm);
  transition: var(--transition-base);
  background-color: #fff;
  color: #212529;
}

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

.card-header {
  border-bottom: 1px solid rgba(0, 0, 0, 0.125);
}

.status-pending {
  background-color: var(--status-pending) !important;
  color: #664d03 !important;
}

.status-in_progress {
  background-color: var(--status-in-progress) !important;
  color: #055160 !important;
}

.status-completed {
  background-color: var(--status-completed) !important;
  color: #0f5132 !important;
}

.status-overdue,
.status-cancelled {
  background-color: var(--status-overdue) !important;
  color: #721c24 !important;
}

.priority-low {
  border-left: 4px solid var(--priority-low);
  background-color: rgba(25, 135, 84, 0.1);
}

.priority-medium {
  border-left: 4px solid var(--priority-medium);
  background-color: rgba(255, 193, 7, 0.1);
}

.priority-high {
  border-left: 4px solid var(--priority-high);
  background-color: rgba(220, 53, 69, 0.1);
}

.priority-urgent {
  border-left: 4px solid var(--priority-urgent);
  background-color: rgba(33, 37, 41, 0.1);
}

.task-card {
  position: relative;
  transition: var(--transition-slow);
  overflow: hidden;
}

.task-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1),
    rgba(255, 255, 255, 0)
  );
  opacity: 0;
  transition: var(--transition-base);
  pointer-events: none;
}

.task-card:hover::before {
  opacity: 1;
}

.task-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.stats-card {
  background: linear-gradient(
    135deg,
    rgba(13, 110, 253, 0.1),
    rgba(13, 110, 253, 0.05)
  );
  border: none;
  transition: var(--transition-slow);
}

.stats-card:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 30px rgba(13, 110, 253, 0.2);
}

.stats-card .card-body {
  position: relative;
  overflow: hidden;
}

.progress {
  background-color: #e9ecef;
  border-radius: var(--border-radius);
  overflow: hidden;
}

.progress-bar {
  background: linear-gradient(90deg, currentColor 0%, currentColor 100%);
  transition: width 0.6s ease;
}

.form-floating > .form-control {
  line-height: 1.25;
  height: auto;
}

.form-floating > textarea.form-control {
  height: auto;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.15);
}

.form-floating > .form-control {
  height: calc(3.5rem + 2px);
  line-height: 1.25;
}

.form-floating > textarea.form-control {
  height: auto;
  min-height: calc(3.5rem + 2px);
}

.btn {
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: var(--transition-base);
}

.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
  pointer-events: none;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn:active {
  transform: translateY(1px);
}

.loading {
  opacity: 0.7;
  pointer-events: none;
  position: relative;
}

.loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid #f3f3f3;
  border-top: 2px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.timeline-item {
  position: relative;
  padding-left: 2rem;
  padding-bottom: 1.5rem;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 0.5rem;
  top: 0.5rem;
  width: 0.75rem;
  height: 0.75rem;
  background-color: var(--primary-color);
  border-radius: 50%;
  border: 2px solid #fff;
  box-shadow: 0 0 0 3px var(--primary-color);
}

.timeline-item::after {
  content: "";
  position: absolute;
  left: 0.875rem;
  top: 1.25rem;
  width: 2px;
  height: calc(100% - 1rem);
  background: linear-gradient(to bottom, var(--primary-color), #e9ecef);
}

.timeline-item:last-child::after {
  display: none;
}

.comment-item {
  border-left: 3px solid #e9ecef;
  transition: var(--transition-base);
  position: relative;
}

.comment-item:hover {
  border-left-color: var(--primary-color);
  background-color: rgba(13, 110, 253, 0.02);
}

.hero-section {
  background: linear-gradient(135deg, var(--primary-color) 0%, #0b5ed7 100%);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0) rotate(0);
  }
  50% {
    transform: translateY(-20px) rotate(180deg);
  }
}

.alert {
  border: none;
  border-radius: var(--border-radius);
  position: relative;
  overflow: hidden;
}

.alert::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: currentColor;
}

.table {
  --bs-table-hover-bg: rgba(13, 110, 253, 0.05);
}

.table-responsive {
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-sm);
}

.dropdown-menu {
  background-color: #fff;
  border: 1px solid rgba(0, 0, 0, 0.15);
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  border-radius: var(--border-radius);
  z-index: 1050;
  min-width: 160px;
}

.dropdown-item {
  color: #212529;
  padding: 0.5rem 1rem;
  transition: var(--transition-fast);
}

.dropdown-item:hover,
.dropdown-item:focus {
  background-color: rgba(13, 110, 253, 0.1);
  color: var(--primary-color);
}

.dropdown-item i {
  margin-right: 0.5rem;
  width: 1rem;
  text-align: center;
}

footer.bg-dark,
footer.bg-dark * {
  color: #f8f9fa;
}

.text-light {
  color: #f8f9fa !important;
}

.text-dark {
  color: #212529 !important;
}

@media (max-width: 768px) {
  .hero-section {
    padding: 2rem 1rem !important;
  }

  .hero-section h1 {
    font-size: 2rem !important;
  }

  .card-columns {
    column-count: 1;
  }

  .task-card,
  .stats-card {
    margin-bottom: 1rem;
  }
}

@media (max-width: 576px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .btn-group {
    flex-direction: column;
    width: 100%;
  }

  .btn-group .btn {
    border-radius: var(--border-radius) !important;
    margin-bottom: 0.5rem;
  }
}

@media print {
  .navbar,
  .btn,
  .alert,
  footer {
    display: none !important;
  }

  .card {
    box-shadow: none !important;
    border: 1px solid #000 !important;
  }

  .container {
    max-width: none !important;
  }
}

@media (prefers-contrast: more), (forced-colors: active) {
  .card,
  .btn,
  .form-control {
    border-width: 2px;
  }

  .btn:focus,
  .form-control:focus {
    outline: 3px solid;
    outline-offset: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

html.theme-dark {
  color-scheme: dark;
}

html.theme-dark body {
  background-color: #121212;
  color: #e9ecef;
}

html.theme-dark .card {
  background-color: #1e1e1e;
  border-color: #333;
  color: #e9ecef;
}

html.theme-dark .text-muted {
  color: #adb5bd;
}

html.theme-dark .dropdown-menu {
  background-color: #1e1e1e;
  border-color: #333;
}

html.theme-dark .dropdown-item {
  color: #e9ecef;
}

html.theme-dark .dropdown-item:hover,
html.theme-dark .dropdown-item:focus {
  background-color: rgba(13, 110, 253, 0.2);
  color: #fff;
}

.form-floating > label {
  overflow: visible !important;
  padding: 0.75rem 0.75rem !important;
  line-height: 1.25 !important;
}

.form-floating > label i {
  margin-right: 0.5rem;
  line-height: 1;
  display: inline-block;
}

.form-floating > .form-control {
  height: calc(3.75rem + 2px) !important;
  padding-top: 1.625rem !important;
  padding-bottom: 0.625rem !important;
}

.form-floating > textarea.form-control {
  min-height: 8rem !important;
  padding-top: 1.625rem !important;
  padding-bottom: 0.625rem !important;
}

.form-floating > .form-control,
.form-floating > textarea.form-control {
  background-color: #fff !important;
  border: 1px solid #dee2e6 !important;
}

.bg-warning,
.bg-warning .card-body,
.bg-warning .card-body .mb-0 {
  color: #212529 !important;
}

.bg-info,
.bg-info .card-body,
.bg-info .card-body .mb-0 {
  color: #212529 !important;
}

.bg-text-warning,
.status-badge.bg-text-warning {
  background-color: transparent;
  color: #856404;
  font-weight: 600;
}

.task-card a.text-decoration-none {
  color: #0a58ca;
}

.btn-outline-primary {
  color: #0a58ca;
  border-color: #0a58ca;
}

.btn-outline-primary:hover,
.btn-outline-primary:focus {
  background-color: #0a58ca;
  color: #ffffff;
  border-color: #0a58ca;
}

.btn-outline-secondary {
  color: #495057;
  border-color: #495057;
}

.btn-outline-secondary:hover,
.btn-outline-secondary:focus {
  background-color: #495057;
  color: #ffffff;
  border-color: #495057;
}

.btn-outline-success {
  color: #157347;
  border-color: #157347;
}

.btn-outline-success:hover,
.btn-outline-success:focus {
  background-color: #157347;
  color: #ffffff;
  border-color: #157347;
}