:root {
  --app-font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --transition-speed: 0.2s;
  --border-radius-card: 1rem;
  --border-radius-sm: 0.5rem;
  --card-shadow: 0 4px 18px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.03);
  --card-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.07), 0 2px 6px rgba(0, 0, 0, 0.04);
  --task-item-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
  --primary-accent: #0d6efd;
  --primary-accent-subtle: #e7f1ff;
  --completed-task-opacity: 0.65;
}

[data-bs-theme="dark"] {
  --card-shadow: 0 4px 18px rgba(0, 0, 0, 0.25), 0 1px 3px rgba(0, 0, 0, 0.15);
  --card-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.35), 0 2px 6px rgba(0, 0, 0, 0.2);
  --task-item-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
  --primary-accent-subtle: rgba(13, 110, 253, 0.15);
  --completed-task-opacity: 0.55;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--app-font-family);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: var(--bs-body-color);
  background-color: var(--bs-tertiary-bg);
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app-header {
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1020;
}

.brand-icon-wrapper {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, #0d6efd, #0b5ed7);
  box-shadow: 0 4px 10px rgba(13, 110, 253, 0.25);
  flex-shrink: 0;
}

.btn-icon-round {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: all var(--transition-speed) ease;
}

.btn-icon-round:hover {
  transform: scale(1.05);
}

.card {
  border-radius: var(--border-radius-card);
  box-shadow: var(--card-shadow);
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.welcome-card {
  background: var(--bs-body-bg);
  border: 1px solid var(--bs-border-color-translucent);
  position: relative;
}

.welcome-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: #0d6efd;
  border-top-left-radius: var(--border-radius-card);
  border-bottom-left-radius: var(--border-radius-card);
}

.date-callout {
  min-width: 200px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.02);
}

.stat-card {
  border: 1px solid var(--bs-border-color-translucent);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

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

.stat-icon-badge {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.form-control,
.form-select {
  border-radius: 0.5rem;
  padding: 0.6rem 0.85rem;
  font-size: 0.95rem;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.15);
}

.input-group .form-control:focus,
.input-group .form-select:focus {
  z-index: 3;
}

.input-group-text {
  border-radius: 0.5rem;
  padding-left: 0.85rem;
  padding-right: 0.85rem;
}

#statusFilterGroup .btn {
  padding: 0.4rem 1rem;
  font-weight: 500;
  border-radius: 2rem !important;
  margin-right: 0.25rem;
}

#statusFilterGroup .btn:last-child {
  margin-right: 0;
}

.task-item {
  background: var(--bs-body-bg);
  border: 1px solid var(--bs-border-color-translucent);
  border-radius: 0.75rem;
  padding: 1rem 1.15rem;
  box-shadow: var(--task-item-shadow);
  transition: all 0.2s ease-in-out;
  position: relative;
  overflow: hidden;
}

.task-item:hover {
  border-color: var(--bs-border-color);
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-1px);
}

.task-item.priority-high {
  border-left: 4px solid var(--bs-danger);
}

.task-item.priority-medium {
  border-left: 4px solid var(--bs-warning);
}

.task-item.priority-low {
  border-left: 4px solid var(--bs-info);
}

.task-checkbox-container {
  display: flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
  margin-right: 0.75rem;
}

.task-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border: 2px solid var(--bs-border-color);
  border-radius: 50%;
  outline: none;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.task-checkbox:hover {
  border-color: var(--primary-accent);
}

.task-checkbox:checked {
  background-color: var(--bs-success);
  border-color: var(--bs-success);
}

.task-checkbox:checked::after {
  content: "";
  width: 5px;
  height: 9px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-bottom: 2px;
}

.task-checkbox:focus-visible {
  box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.25);
}

.task-item.completed {
  opacity: var(--completed-task-opacity);
  background-color: var(--bs-tertiary-bg);
  border-left-color: var(--bs-secondary);
}

.task-item.completed .task-title {
  text-decoration: line-through;
  color: var(--bs-secondary-color);
}

.task-title {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--bs-body-color);
  word-break: break-word;
  transition: color 0.15s ease;
}

.task-meta-tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  border-radius: 2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.task-action-btn {
  width: 32px;
  height: 32px;
  padding: 0;
  border-radius: 0.4rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: var(--bs-secondary-color);
  border: 1px solid transparent;
  background: transparent;
  transition: all 0.15s ease;
}

.task-action-btn:hover {
  background-color: var(--bs-secondary-bg);
  color: var(--bs-body-color);
}

.task-action-btn.delete-btn:hover {
  background-color: var(--bs-danger-subtle);
  color: var(--bs-danger);
  border-color: var(--bs-danger-subtle);
}

.task-action-btn.edit-btn:hover {
  background-color: var(--bs-primary-subtle);
  color: var(--bs-primary);
  border-color: var(--bs-primary-subtle);
}

.inline-edit-input {
  font-size: 0.95rem;
  padding: 0.4rem 0.65rem;
  border-radius: 0.4rem;
}

.empty-state-wrapper {
  background-color: var(--bs-body-bg);
  border: 2px dashed var(--bs-border-color);
  border-radius: var(--border-radius-card);
}

.empty-state-icon {
  width: 72px;
  height: 72px;
}

.empty-state-desc {
  max-width: 380px;
}

.progress-modern {
  height: 10px;
  border-radius: 1rem;
  background-color: var(--bs-secondary-bg);
  overflow: hidden;
}

.progress-modern .progress-bar {
  border-radius: 1rem;
  transition: width 0.4s ease;
}

.badge-priority-high {
  background-color: rgba(220, 53, 69, 0.12);
  color: #dc3545;
  border: 1px solid rgba(220, 53, 69, 0.2);
}

.badge-priority-medium {
  background-color: rgba(255, 193, 7, 0.15);
  color: #d97706;
  border: 1px solid rgba(255, 193, 7, 0.3);
}

[data-bs-theme="dark"] .badge-priority-medium {
  color: #fbbf24;
}

.badge-priority-low {
  background-color: rgba(13, 202, 240, 0.12);
  color: #0aa2c0;
  border: 1px solid rgba(13, 202, 240, 0.25);
}

[data-bs-theme="dark"] .badge-priority-low {
  color: #38bdf8;
}

.badge-category {
  background-color: var(--bs-secondary-bg);
  color: var(--bs-secondary-color);
  border: 1px solid var(--bs-border-color);
}

@media (max-width: 576px) {
  .welcome-card .card-body {
    padding: 1.25rem;
  }

  .date-callout {
    width: 100%;
    margin-top: 0.5rem;
  }

  .task-item {
    padding: 0.85rem;
  }

  .task-actions {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px dashed var(--bs-border-color-translucent);
    width: 100%;
    justify-content: flex-end;
  }

  .stat-card .card-body {
    padding: 1rem;
  }

  .stat-icon-badge {
    width: 38px;
    height: 38px;
  }

  .stat-icon-badge i {
    font-size: 1.2rem !important;
  }
}

kbd {
  font-family: inherit;
  font-size: 0.75rem;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}