/**
 * Font Size Control CSS
 * Styles for the font size adjustment feature
 */

/* Font size control container */
.font-size-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-right: var(--spacing-md);
}

.font-size-label {
  font-size: var(--font-size-sm);
  color: white;
  font-weight: 500;
  white-space: nowrap;
}

/* Button group */
.font-size-buttons {
  display: flex;
  gap: 4px;
  background-color: rgba(255, 255, 255, 0.1);
  padding: 4px;
  border-radius: var(--border-radius-md);
}

/* Individual font size buttons */
.font-size-btn {
  background-color: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
  padding: 6px 10px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 600;
  transition: all var(--transition-base);
  min-width: 40px;
  text-align: center;
}

.font-size-btn:hover {
  background-color: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-1px);
}

.font-size-btn:active {
  transform: translateY(0);
}

.font-size-btn.active {
  background-color: white;
  color: var(--color-primary);
  border-color: white;
  font-weight: 700;
}

.font-size-btn:focus {
  outline: 2px solid white;
  outline-offset: 2px;
}

/* Apply font sizes using CSS custom property */
.reading-content {
  font-size: var(--reader-font-size, 18px);
}

/* Adjust line height proportionally */
[data-font-size="small"] .reading-content {
  line-height: 1.7;
}

[data-font-size="medium"] .reading-content {
  line-height: 1.8;
}

[data-font-size="large"] .reading-content {
  line-height: 1.9;
}

[data-font-size="xlarge"] .reading-content {
  line-height: 2.0;
}

/* Adjust headings proportionally */
[data-font-size="small"] .reading-content h1 {
  font-size: 1.75em;
}

[data-font-size="medium"] .reading-content h1 {
  font-size: 2em;
}

[data-font-size="large"] .reading-content h1 {
  font-size: 2.25em;
}

[data-font-size="xlarge"] .reading-content h1 {
  font-size: 2.5em;
}

[data-font-size="small"] .reading-content h2 {
  font-size: 1.5em;
}

[data-font-size="medium"] .reading-content h2 {
  font-size: 1.75em;
}

[data-font-size="large"] .reading-content h2 {
  font-size: 2em;
}

[data-font-size="xlarge"] .reading-content h2 {
  font-size: 2.25em;
}

[data-font-size="small"] .reading-content h3 {
  font-size: 1.25em;
}

[data-font-size="medium"] .reading-content h3 {
  font-size: 1.5em;
}

[data-font-size="large"] .reading-content h3 {
  font-size: 1.75em;
}

[data-font-size="xlarge"] .reading-content h3 {
  font-size: 2em;
}

/* Screen reader only content for announcements */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Responsive adjustments */

/* Tablet and below */
@media (max-width: 768px) {
  .font-size-control {
    margin-right: var(--spacing-sm);
  }

  .font-size-label {
    display: none; /* Hide label on mobile to save space */
  }

  .font-size-buttons {
    padding: 3px;
    gap: 2px;
  }

  .font-size-btn {
    padding: 5px 8px;
    font-size: 12px;
    min-width: 36px;
  }
}

/* Mobile phones */
@media (max-width: 480px) {
  .font-size-control {
    margin-right: 0;
  }

  .font-size-buttons {
    gap: 2px;
  }

  .font-size-btn {
    padding: 4px 6px;
    font-size: 11px;
    min-width: 32px;
  }

  /* Stack controls vertically on very small screens if needed */
  .reader-header .container {
    flex-wrap: wrap;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .font-size-btn {
    border-width: 2px;
  }

  .font-size-btn.active {
    border-width: 3px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .font-size-btn {
    transition: none;
  }

  .font-size-btn:hover {
    transform: none;
  }
}

/* Print styles - use comfortable reading size */
@media print {
  .font-size-control {
    display: none;
  }

  .reading-content {
    font-size: 12pt;
    line-height: 1.6;
  }
}