/**
 * Print Stylesheet for Physics Book
 * Optimizes the book layout for PDF generation and printing
 */

@media print {
  /* ==================== Print Variables ==================== */
  @page {
    size: letter;
    margin: 0.75in;
  }

  @page :first {
    margin-block-start: 1in;
  }

  /* CSS Custom Properties for Print */
  :root {
    --print-color-primary: #1565c0;
    --print-color-secondary: #1976d2;
    --print-color-tertiary: #0288d1;
    --print-color-border: #64b5f6;
    --print-color-text: black;
    --print-color-bg: white;
    --print-color-code-bg: #f5f5f5;
    --print-color-code-border: #ddd;
    --print-color-table-border: #333;
    --print-color-blockquote-border: #333;
    --print-color-example: #2196f3;
    --print-color-example-bg: #e3f2fd;
    --print-color-note: #4caf50;
    --print-color-note-bg: #e8f5e9;
    --print-color-warning: #ff9800;
    --print-color-warning-bg: #fff3e0;
    --print-color-tip: #9c27b0;
    --print-color-tip-bg: #f3e5f5;
    --print-color-problem-bg: #f5f5f5;
    --print-color-problem-border: #757575;
    --print-color-concept-bg: #ffe0b2;
    --print-color-concept-border: #ff9800;
    --print-color-summary-bg: #fff9c4;
    --print-color-summary-border: #fbc02d;
    --print-color-glossary-bg: #f3e5f5;
    --print-color-glossary-border: #9c27b0;
    --print-color-glossary-title: #6a1b9a;
    --print-color-abstract-bg: #e1f5fe;
    --print-color-abstract-border: #0288d1;

    --print-border-width-thin: 2px;
    --print-border-width-medium: 3px;
    --print-border-width-thick: 4px;
    --print-border-radius: 4px;
    --print-border-radius-sm: 3px;

    --print-spacing-sm: 10px;
    --print-spacing-md: 15px;
    --print-spacing-lg: 1em;

    --print-font-size-base: 11pt;
    --print-font-size-h1: 24pt;
    --print-font-size-h2: 18pt;
    --print-font-size-h3: 14pt;
    --print-font-size-h4: 12pt;
    --print-font-size-small: 0.9em;
    --print-font-size-tiny: 0.8em;
  }

  /* ==================== Hide Non-Essential Elements ==================== */

  :is(
    nav,
    .navigation,
    .nav,
    .sidebar,
    .menu,
    .toc-toggle,
    .book-search,
    .gitbook-link,
    #gitbook-toolbar,
    .toolbar,
    .book-menu-btn,
    .font-settings,
    .pull-right,
    .dropdown,
    .social-share,
    .comments,
    .footer-links,
    .edit-link,
    .btn-group,
    .pdf-download-btn,
    header nav,
    footer nav,
    .pwa-install,
    .offline-indicator,
    .update-notification,
    .book-summary,
    .book-header,
    .no-print
  ) {
    display: none !important;
  }

  /* ==================== Layout Adjustments ==================== */

  body {
    background: var(--print-color-bg) !important;
    color: var(--print-color-text) !important;
    font-size: var(--print-font-size-base);
    line-height: 1.5;
  }

  :is(
    .book,
    .book-body,
    .body-inner,
    .page-wrapper,
    .page-inner,
    .markdown-section,
    main,
    article,
    .content
  ) {
    inline-size: 100% !important;
    max-inline-size: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    float: none !important;
    position: static !important;
    overflow: visible !important;
  }

  /* ==================== Typography ==================== */

  h1 {
    font-size: var(--print-font-size-h1);
    page-break-before: always;
    page-break-after: avoid;
    margin-block-start: 0;
    color: var(--print-color-primary) !important;
    border-block-end: var(--print-border-width-medium) solid var(--print-color-primary);
    padding-block-end: 8px;
  }

  h1:first-of-type {
    page-break-before: avoid;
  }

  h2 {
    font-size: var(--print-font-size-h2);
    page-break-after: avoid;
    color: var(--print-color-secondary) !important;
    border-block-end: var(--print-border-width-thin) solid var(--print-color-border);
    padding-block-end: 6px;
  }

  h3 {
    font-size: var(--print-font-size-h3);
    page-break-after: avoid;
    color: var(--print-color-tertiary) !important;
  }

  :is(h4, h5, h6) {
    font-size: var(--print-font-size-h4);
    page-break-after: avoid;
  }

  /* Prevent headings at bottom of page */
  :is(h1, h2, h3, h4, h5, h6) {
    page-break-inside: avoid;
    orphans: 3;
    widows: 3;
  }

  p {
    orphans: 3;
    widows: 3;
  }

  /* ==================== Links ==================== */

  a {
    color: var(--print-color-text) !important;
    text-decoration: underline;
  }

  /* Show URL for external links */
  a[href^='http']::after {
    content: ' (' attr(href) ')';
    font-size: var(--print-font-size-tiny);
    color: #666;
    word-break: break-all;
  }

  /* Don't show URL for internal links */
  :is(
    a[href^='#']::after,
    a[href^='/']::after,
    a[href^='./']::after,
    a[href^='../']::after,
    nav a::after,
    .toc a::after
  ) {
    content: '' !important;
  }

  /* ==================== Images and Figures ==================== */

  img {
    max-inline-size: 65% !important;
    max-block-size: 4in !important;
    block-size: auto !important;
    inline-size: auto !important;
    display: block;
    margin: var(--print-spacing-sm) auto !important;
    page-break-inside: avoid;
    object-fit: contain !important;
  }

  figure {
    max-inline-size: 65% !important;
    max-block-size: 4.5in !important;
    margin: var(--print-spacing-sm) auto !important;
    page-break-inside: avoid;
    page-break-after: avoid;
  }

  figure img {
    max-inline-size: 100% !important;
    max-block-size: 4in !important;
    margin: 0 auto !important;
    object-fit: contain !important;
  }

  /* Very small images can be even smaller */
  :is(img[width], img[height]) {
    max-inline-size: 50% !important;
    max-block-size: 3in !important;
  }

  figcaption {
    font-size: var(--print-font-size-small);
    font-style: italic;
    text-align: center;
    margin-block-start: 0.5em;
  }

  /* ==================== Tables ==================== */

  table {
    border-collapse: collapse;
    inline-size: 100%;
    page-break-inside: avoid;
    margin-block: var(--print-spacing-lg);
  }

  thead {
    display: table-header-group;
  }

  tr {
    page-break-inside: avoid;
  }

  :is(th, td) {
    border: 1px solid var(--print-color-table-border);
    padding: 8px;
    text-align: start;
  }

  th {
    background-color: #f0f0f0 !important;
    font-weight: bold;
  }

  /* ==================== Code Blocks ==================== */

  :is(pre, code) {
    font-family: 'Courier New', Courier, monospace;
    font-size: 10pt;
    background-color: var(--print-color-code-bg) !important;
    border: 1px solid var(--print-color-code-border);
  }

  pre {
    padding: var(--print-spacing-sm);
    page-break-inside: avoid;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
  }

  code {
    padding: 2px 4px;
  }

  pre code {
    border: none;
    padding: 0;
  }

  /* ==================== Math (MathJax) ==================== */

  :is(
    .MathJax,
    .MathJax_Display,
    mjx-container,
    .math,
    .katex,
    .katex-display
  ) {
    page-break-inside: avoid !important;
  }

  /* Scale down math to match text better */
  :is(
    mjx-container,
    mjx-container[display='true'],
    mjx-container[display='false'],
    .MathJax,
    .MathJax_Display,
    .math,
    .katex,
    .katex-display
  ) {
    font-size: 0.95em !important;
  }

  /* Inline math should be even smaller */
  :is(
    mjx-container[display='false'],
    .MathJax:not(.MathJax_Display),
    .katex:not(.katex-display),
    span.math
  ) {
    font-size: 0.9em !important;
    vertical-align: baseline !important;
  }

  /* Ensure math displays properly */
  :is(
    .MathJax_Display,
    mjx-container[display='true'],
    .katex-display
  ) {
    margin-block: var(--print-spacing-lg) !important;
    overflow-x: visible !important;
  }

  /* ==================== Blockquotes and Special Boxes ==================== */

  blockquote {
    border-inline-start: var(--print-border-width-medium) solid var(--print-color-blockquote-border);
    margin-block: var(--print-spacing-lg);
    padding: 0.5em 1em;
    background-color: #f9f9f9 !important;
    page-break-inside: avoid;
  }

  /* Example boxes with colorful backgrounds */
  :is(.example, .worked-example) {
    page-break-inside: avoid;
    border-inline-start: var(--print-border-width-thick) solid var(--print-color-example);
    background-color: var(--print-color-example-bg) !important;
    padding: var(--print-spacing-md);
    margin-block: var(--print-spacing-md);
    border-radius: var(--print-border-radius);
  }

  :is(.example-title, .example h4:first-child) {
    font-weight: bold;
    margin-block-end: 0.5em;
  }

  /* Note/Warning/Info boxes */
  :is(.note, .info) {
    page-break-inside: avoid;
    border-inline-start: var(--print-border-width-thick) solid var(--print-color-note);
    background-color: var(--print-color-note-bg) !important;
    padding: var(--print-spacing-md);
    margin-block: var(--print-spacing-md);
    border-radius: var(--print-border-radius);
  }

  :is(.warning, .important) {
    page-break-inside: avoid;
    border-inline-start: var(--print-border-width-thick) solid var(--print-color-warning);
    background-color: var(--print-color-warning-bg) !important;
    padding: var(--print-spacing-md);
    margin-block: var(--print-spacing-md);
    border-radius: var(--print-border-radius);
  }

  .tip {
    page-break-inside: avoid;
    border-inline-start: var(--print-border-width-thick) solid var(--print-color-tip);
    background-color: var(--print-color-tip-bg) !important;
    padding: var(--print-spacing-md);
    margin-block: var(--print-spacing-md);
    border-radius: var(--print-border-radius);
  }

  /* ==================== Lists ==================== */

  :is(ul, ol, dl) {
    page-break-inside: avoid;
  }

  li {
    page-break-inside: avoid;
  }

  dt {
    font-weight: bold;
    margin-block-start: 0.5em;
  }

  dd {
    margin-inline-start: 2em;
    margin-block-end: 0.5em;
  }

  /* ==================== Physics-Specific Elements ==================== */

  /* Equations that should stay together */
  :is(.equation, .formula) {
    page-break-inside: avoid;
    background-color: var(--print-color-code-bg) !important;
    padding: var(--print-spacing-sm);
    margin-block: var(--print-spacing-md);
    border-radius: var(--print-border-radius-sm);
    text-align: center;
  }

  /* Problem sets */
  :is(.problems, .exercises) {
    page-break-before: always;
  }

  /* Exercise and problem boxes */
  :is(.problem, .exercise) {
    page-break-inside: avoid;
    background-color: var(--print-color-problem-bg) !important;
    border-inline-start: var(--print-border-width-medium) solid var(--print-color-problem-border);
    padding: 12px;
    margin-block: 12px;
    border-radius: var(--print-border-radius-sm);
  }

  /* Concept checks with orange dashed border */
  :is(
    .concept-check,
    .check-understanding,
    [data-element-type='check-understanding']
  ) {
    page-break-inside: avoid;
    background-color: var(--print-color-concept-bg) !important;
    border: 2px dashed var(--print-color-concept-border);
    padding: var(--print-spacing-md);
    margin-block: var(--print-spacing-md);
    border-radius: var(--print-border-radius);
  }

  /* Hide solutions to end-of-chapter problems */
  :is(
    .solution,
    div.solution,
    [data-element-type='solution']
  ) {
    display: none !important;
  }

  /* Section summaries with yellow background */
  :is(
    .summary,
    .section-summary,
    .key-equations,
    [data-element-type='section-summary']
  ) {
    page-break-inside: avoid;
    background-color: var(--print-color-summary-bg) !important;
    border: var(--print-border-width-thin) solid var(--print-color-summary-border);
    border-radius: var(--print-border-radius);
    padding: var(--print-spacing-md);
    margin-block: var(--print-spacing-md);
  }

  /* Glossary with purple background */
  .glossary {
    page-break-inside: avoid;
    background-color: var(--print-color-glossary-bg) !important;
    border: var(--print-border-width-thin) solid var(--print-color-glossary-border);
    border-radius: var(--print-border-radius);
    padding: var(--print-spacing-md);
    margin-block: var(--print-spacing-md);
  }

  .glossary-title {
    color: var(--print-color-glossary-title) !important;
    border-block-end: var(--print-border-width-thin) solid var(--print-color-glossary-border);
    padding-block-end: 8px;
    margin-block-end: 12px;
  }

  .glossary-term {
    font-weight: bold;
  }

  .glossary-definition {
    margin-inline-start: 1em;
  }

  /* Abstract/Learning objectives */
  :is(.abstract, .learning-objectives) {
    page-break-inside: avoid;
    background-color: var(--print-color-abstract-bg) !important;
    border-inline-start: var(--print-border-width-thick) solid var(--print-color-abstract-border);
    padding: var(--print-spacing-md);
    margin-block: var(--print-spacing-md);
    border-radius: var(--print-border-radius);
  }

  /* ==================== Chapter/Section Headers ==================== */

  .chapter-header {
    page-break-before: always;
    text-align: center;
    margin-block-end: 2em;
  }

  .chapter-number {
    font-size: 48pt;
    color: #333;
  }

  .chapter-title {
    font-size: var(--print-font-size-h1);
    margin-block-start: 0.5em;
  }

  /* ==================== Utility Classes ==================== */

  .print-only {
    display: block !important;
  }

  .page-break-before {
    page-break-before: always;
  }

  .page-break-after {
    page-break-after: always;
  }

  .avoid-break {
    page-break-inside: avoid;
  }
}

/* Hide print-only elements on screen */
@media screen {
  .print-only {
    display: none !important;
  }
}