/**
 * Navigation Component Styles
 * Unified navigation for all sequential content types
 * Consolidates: unified-navigation.css + activity-ui.css navigation sections
 */

/* ========================================
   UNIFIED NAVIGATION COMPONENT
   ======================================== */

.unified-navigation {
  background: var(--color-background-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  box-shadow: var(--shadow-sm);
}

.nav-progress {
  margin-bottom: var(--spacing-md);
}

.nav-progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.nav-progress-fill {
  height: 100%;
  background-color: var(--color-primary);
  transition: width var(--transition-fast);
}

.nav-progress-text {
  text-align: center;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
}

.nav-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.nav-selector-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex: 1;
  justify-content: center;
}

.nav-selector-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  white-space: nowrap;
}

.nav-selector {
  padding: 0.5rem 2.5rem 0.5rem 1rem;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-background);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2334495e' 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 8px center;
  background-size: 16px;
  appearance: none;
  cursor: pointer;
  min-width: 180px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-selector:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.nav-selector:hover {
  border-color: var(--color-primary);
}

.nav-icon {
  font-size: 1.2em;
  line-height: 1;
}

.nav-text {
  font-weight: var(--font-weight-medium);
}

/* ========================================
   NAVIGATION CONTAINER
   ======================================== */

.unified-navigation-container {
  background: var(--color-background-alt);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0 var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

/* ========================================
   NAVIGATION CONTROLS ROW
   ======================================== */

.navigation-controls-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

/* ========================================
   DROPDOWN SELECTOR
   ======================================== */

.problem-dropdown-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  min-width: 200px;
}

.dropdown-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.problem-selector {
  padding: 0.5rem 2.5rem 0.5rem 1rem;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  border: 2px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  background-color: var(--color-background);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2334495e' 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 8px center;
  background-size: 16px;
  appearance: none;
  cursor: pointer;
  min-width: 180px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.problem-selector:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.problem-selector:hover {
  border-color: var(--color-primary);
}

/* ========================================
   NAVIGATION BUTTONS
   ======================================== */

.activity-navigation {
  display: flex;
  gap: var(--spacing-md);
}

.nav-button,
.activity-nav-button {
  padding: 0.6rem 1.5rem;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-primary);
  color: #ffffff;  /* Force white text */
  background-color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast), 
              border-color var(--transition-fast),
              transform var(--transition-fast),
              box-shadow var(--transition-fast);
  min-width: 120px;
  text-align: center;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  /* Force visibility */
  visibility: visible !important;
  opacity: 1 !important;
}

.nav-button:hover:not(:disabled),
.activity-nav-button:hover:not(:disabled) {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.nav-button:active:not(:disabled),
.activity-nav-button:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.nav-button:focus,
.activity-nav-button:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.nav-button:disabled,
.activity-nav-button:disabled {
  background-color: var(--color-border);
  border-color: var(--color-border);
  color: var(--color-text-muted);
  cursor: not-allowed;
  opacity: 0.6;
}

/* Navigation control selectors */
#nav-prev,
#nav-next,
#prev-item,
#next-item {
  min-width: 120px;
  /* Debug styling to ensure visibility */
  background-color: var(--color-primary) !important;
  color: #ffffff !important;
  border: 2px solid var(--color-primary) !important;
  display: inline-flex !important;
  visibility: visible !important;
  opacity: 1 !important;
}

/* Fix for Next button clickability (emergency patch preserved) */
#nav-next,
#next-item {
  position: relative;
  z-index: var(--z-dropdown);
  pointer-events: auto;
  overflow: visible;
  /* Extra debug for Next button */
  background-color: #007bff !important;
  color: #ffffff !important;
}

#next-item::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  cursor: pointer;
}

#next-item span {
  pointer-events: none;
}

/* ========================================
   NAVIGATION CONTROLS (for compatibility)
   ======================================== */

.nav-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-md) 0;
}

.nav-selector {
  flex: 1;
  max-width: 300px;
  padding: 0.5rem 2.5rem 0.5rem 1rem;
  font-size: var(--font-size-md);
  border: 2px solid var(--color-border-dark);
  border-radius: var(--radius-sm);
  background-color: var(--color-background);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2334495e' 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 8px center;
  background-size: 16px;
  appearance: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.nav-selector:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
  .navigation-controls-row {
    flex-direction: column;
    align-items: stretch;
  }

  .problem-dropdown-container,
  .activity-navigation {
    justify-content: center;
  }

  .problem-selector,
  .nav-selector {
    min-width: 100%;
  }

  #prev-item,
  #next-item,
  .nav-button {
    flex: 1;
  }
}

@media (max-width: 480px) {
  .unified-navigation-container {
    padding: var(--spacing-sm);
  }

  .activity-navigation {
    flex-direction: column;
  }

  #prev-item,
  #next-item,
  .nav-button {
    width: 100%;
  }
}

/* ========================================
   KEYBOARD NAVIGATION INDICATORS
   ======================================== */

.nav-button:focus-visible,
.problem-selector:focus-visible,
.nav-selector:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
  .unified-navigation-container,
  .activity-navigation,
  .nav-controls {
    display: none;
  }
}