/* Modern Distill.pub-inspired Academic Publishing CSS */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:400,600,700&family=Source+Sans+Pro:400,600,700&family=Source+Code+Pro:400;600&display=swap');

/* CSS Custom Properties */
:root {
  /* Colors - Distill.pub inspired palette */
  --d-text-color: #1a1a1a;
  --d-primary-color: #2c3e50;
  --d-accent-color: #0066cc;
  --d-accent-hover: #0052a3;
  --d-secondary-accent: #e74c3c;
  --d-light-text: #666666;
  --d-muted-text: #999999;
  --d-background-color: #ffffff;
  --d-page-bg: #ffffff;
  --d-citation-bg: #f0f7ff;
  --d-code-bg: #f8f9fa;
  --d-blockquote-bg: #f8f9fa;
  --d-border-color: #e1e4e8;
  --d-subtle-border: #f0f0f0;
  --d-hover-bg: #f6f8fa;
  --d-selection-bg: #0066cc;
  --d-selection-text: #ffffff;

  /* Typography */
  --d-body-font: 'Crimson Text', Georgia, serif;
  --d-heading-font: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --d-code-font: 'Source Code Pro', 'Monaco', 'Consolas', monospace;

  /* Spacing */
  --d-content-width: 700px;
  --d-sidebar-width: 260px;
  --d-spacing-xs: 0.25rem;
  --d-spacing-sm: 0.5rem;
  --d-spacing-md: 1rem;
  --d-spacing-lg: 1.5rem;
  --d-spacing-xl: 2rem;
  --d-spacing-xxl: 3rem;

  /* Shadows */
  --d-shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --d-shadow-md: 0 2px 8px rgba(0,0,0,0.15);
  --d-shadow-lg: 0 4px 16px rgba(0,0,0,0.1);

  /* Border radius */
  --d-radius-sm: 4px;
  --d-radius-md: 6px;
  --d-radius-lg: 8px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    /* Warmer, softer dark mode colors */
    --d-text-color: #e1e8ed;
    --d-primary-color: #d4e4ed;
    --d-accent-color: #71b4f8;
    --d-accent-hover: #5ca3f0;
    --d-secondary-accent: #f8b7d1;
    --d-light-text: #a0aec0;
    --d-muted-text: #718096;
    --d-background-color: #2d3748;
    --d-page-bg: #1a202c;
    --d-citation-bg: #2c5282;
    --d-code-bg: #2d3748;
    --d-blockquote-bg: #2d3748;
    --d-border-color: #4a5568;
    --d-subtle-border: #4a5568;
    --d-hover-bg: #374151;
    --d-selection-bg: #63b3ed;
    --d-selection-text: #1a202c;

    /* Softer shadows for dark mode */
    --d-shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --d-shadow-md: 0 2px 8px rgba(0,0,0,0.4);
    --d-shadow-lg: 0 4px 16px rgba(0,0,0,0.3);
  }
}

/* Reset and base styles */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
}

body {
  font-family: var(--d-body-font);
  font-size: 1.125rem; /* 18px */
  line-height: 1.7;
  color: var(--d-text-color);
  background-color: var(--d-page-bg);
  margin: 0 auto;
  padding: 0;
  max-width: 800px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

@media (prefers-color-scheme: dark) {
  .abstract, .code-repo {
    background: var(--d-blockquote-bg);
  }
}

/* Selection */
::selection {
  background-color: var(--d-selection-bg);
  color: var(--d-selection-text);
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--d-accent-color);
  outline-offset: 2px;
}

/* Links */
a {
  color: var(--d-accent-color);
  text-decoration: none;
  transition: color 0.2s ease, text-decoration 0.2s ease;
}

a:hover {
  color: var(--d-accent-hover);
  text-decoration: underline;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--d-heading-font);
  font-weight: 700;
  line-height: 1.3;
  color: var(--d-primary-color);
  margin-top: 2.5em;
  margin-bottom: 1em;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 2.5rem;
  margin-top: 0;
  margin-bottom: 0.5em;
  text-align: center;
  color: var(--d-primary-color);
}

h2 {
  font-size: 1.875rem;
  margin-top: 3em;
  padding-bottom: 0.5em;
  border-bottom: 1px solid var(--d-border-color);
}

h3 {
  font-size: 1.5rem;
  margin-top: 2.5em;
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  margin-top: 2em;
  font-weight: 600;
}

h5 {
  font-size: 1.125rem;
  margin-top: 1.5em;
  font-weight: 600;
}

h6 {
  font-size: 1rem;
  margin-top: 1.5em;
  font-weight: 600;
}

p {
  margin-bottom: 1.5em;
  text-align: justify;
  hyphens: auto;
  orphans: 3;
  widows: 3;
}

/* Strong and emphasis */
strong, b {
  font-weight: 600;
  color: var(--d-primary-color);
}

em, i {
  font-style: italic;
}

/* Lists */
ul, ol {
  margin-bottom: 1.5em;
  padding-left: 1.5em;
}

li {
  margin-bottom: 0.5em;
}

li:last-child {
  margin-bottom: 0;
}

/* Blockquotes */
blockquote {
  margin: 2em 0;
  padding: 1em 1.5em;
  border-left: 4px solid var(--d-accent-color);
  background-color: var(--d-blockquote-bg);
  border-radius: 0 var(--d-radius-md) var(--d-radius-md) 0;
  font-style: italic;
  color: var(--d-light-text);
}

blockquote p {
  margin-bottom: 0;
}

/* Code */
code {
  font-family: var(--d-code-font);
  font-size: 0.875em;
  background-color: var(--d-code-bg);
  padding: 0.125em 0.375em;
  border-radius: var(--d-radius-sm);
  border: 1px solid var(--d-border-color);
  color: var(--d-primary-color);
}

pre {
  font-family: var(--d-code-font);
  font-size: 0.875em;
  line-height: 1.5;
  background-color: var(--d-code-bg);
  border: 1px solid var(--d-border-color);
  border-radius: var(--d-radius-lg);
  padding: 1.5em;
  overflow-x: auto;
  margin: 2em 0;
  box-shadow: var(--d-shadow-sm);
}

pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: inherit;
}

/* Math */
.MathJax {
  font-size: 1.1em !important;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 2em 0;
  font-size: 0.9rem;
  background-color: var(--d-page-bg);
  border-radius: var(--d-radius-lg);
  overflow: hidden;
  box-shadow: var(--d-shadow-sm);
  border: 1px solid var(--d-border-color);
}

th, td {
  padding: 0.875rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--d-subtle-border);
  vertical-align: top;
}

th {
  background-color: var(--d-code-bg);
  font-family: var(--d-heading-font);
  font-weight: 600;
  color: var(--d-primary-color);
  border-bottom: 2px solid var(--d-accent-color);
}

tbody tr:last-child th,
tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background-color: var(--d-hover-bg);
}

/* Horizontal rules */
hr {
  border: none;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--d-border-color), transparent);
  margin: 3em 0;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2em auto;
  border-radius: var(--d-radius-lg);
  box-shadow: var(--d-shadow-md);
  border: 1px solid var(--d-border-color);
}

/* Distill.pub Components */

/* Article container */
d-article {
  display: block;
  position: relative;
  max-width: var(--d-content-width);
  margin: 0 auto;
  padding: 0 var(--d-spacing-lg) var(--d-spacing-xl);
  font-family: var(--d-body-font);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--d-text-color);
}

/* Title section */
d-title {
  display: block;
  text-align: center;
  padding: 4rem 0 2rem;
  position: relative;
}

d-title h1 {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 0.5em;
  color: var(--d-primary-color);
  letter-spacing: -0.01em;
}

d-title .subtitle {
  font-family: var(--d-body-font);
  font-size: 1.375rem;
  font-weight: 400;
  font-style: italic;
  color: var(--d-light-text);
  margin: 0 0 3rem;
  line-height: 1.4;
}

/* Authors section */
d-title .authors {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin: 2rem 0;
  gap: 2rem;
}

d-title .author {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

d-title .author .name {
  font-family: var(--d-heading-font);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--d-primary-color);
  margin-bottom: 0.25rem;
}

d-title .author .affiliation {
  font-size: 0.9rem;
  color: var(--d-light-text);
  font-style: italic;
}

/* Publication date */
d-title .date {
  font-size: 0.9rem;
  color: var(--d-muted-text);
  margin: 2rem 0 0;
  font-style: italic;
}

/* Byline */
d-byline {
  display: block;
  border-top: 1px solid var(--d-border-color);
  border-bottom: 1px solid var(--d-border-color);
  padding: 1.5rem 0;
  margin: 2rem 0;
  font-size: 0.9rem;
  color: var(--d-light-text);
}

d-byline .byline-info {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

d-byline .published {
  font-style: italic;
}

/* Table of contents */
d-contents {
  display: block;
  position: absolute;
  top: 0;
  right: calc(-1 * var(--d-sidebar-width) - 4rem);
  width: var(--d-sidebar-width);
  font-size: 0.875rem;
  line-height: 1.5;
  padding: 2rem 1rem;
  z-index: 10;
}

d-contents .toc-header {
  font-family: var(--d-heading-font);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--d-primary-color);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

d-contents nav {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

d-contents nav > div {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

d-contents h3 {
  font-family: var(--d-heading-font);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--d-primary-color);
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

d-contents ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

d-contents li {
  margin-bottom: 0.25rem;
}

d-contents a {
  color: var(--d-accent-color);
  text-decoration: none;
  transition: color 0.2s ease;
  font-weight: 400;
}

d-contents a:hover {
  color: var(--d-accent-hover);
  text-decoration: underline;
}

d-contents a.active {
  color: var(--d-primary-color);
  font-weight: 600;
}

/* Appendix */
d-appendix {
  display: grid;
  grid-template-columns: 1fr var(--d-sidebar-width);
  gap: 3rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--d-border-color);
}

d-appendix .citation-list {
  grid-column: 1;
}

d-appendix .sidebar {
  grid-column: 2;
}

d-appendix h3 {
  font-size: 1.25rem;
  margin-top: 0;
  margin-bottom: 1rem;
  color: var(--d-primary-color);
  border-bottom: 1px solid var(--d-border-color);
  padding-bottom: 0.5rem;
}

/* Citations */
.citation {
  margin-bottom: 1rem;
  padding: 1rem;
  background-color: var(--d-code-bg);
  border-radius: var(--d-radius-md);
  border-left: 3px solid var(--d-accent-color);
  font-size: 0.9rem;
  line-height: 1.5;
}

.citation .citation-number {
  font-weight: 600;
  color: var(--d-accent-color);
  margin-right: 0.5em;
}

/* Citation markers in text */
.citation-marker {
  color: var(--d-accent-color);
  font-weight: 600;
  font-size: 0.75em;
  vertical-align: super;
  cursor: pointer;
  position: relative;
  padding: 0.125em 0.375em;
  border-radius: var(--d-radius-sm);
  transition: background-color 0.2s ease;
  text-decoration: none;
}

.citation-marker:hover {
  background-color: var(--d-citation-bg);
  text-decoration: none;
}

/* Citation popup */
.citation-popup {
  position: absolute;
  bottom: calc(100% + 0.5rem);
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--d-page-bg);
  border: 1px solid var(--d-border-color);
  border-radius: var(--d-radius-md);
  padding: 1rem;
  box-shadow: var(--d-shadow-lg);
  z-index: 1000;
  width: 300px;
  max-width: 90vw;
  max-height: 200px;
  overflow-y: auto;
  font-size: 0.875rem;
  line-height: 1.4;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.citation-popup.show {
  opacity: 1;
  visibility: visible;
}

.citation-popup::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--d-page-bg);
}

.citation-popup .popup-title {
  font-family: var(--d-heading-font);
  font-weight: 600;
  color: var(--d-primary-color);
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
}

.citation-popup .popup-content {
  color: var(--d-text-color);
}

/* Abstract */
.abstract {
  background: linear-gradient(135deg, var(--d-code-bg) 0%, var(--d-page-bg) 100%);
  padding: 2rem;
  border-radius: var(--d-radius-lg);
  margin: 2rem 0;
  border-left: 4px solid var(--d-accent-color);
  font-size: 0.95rem;
  line-height: 1.6;
  position: relative;
  overflow: hidden;
}

.abstract::before {
  content: 'Abstract';
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 0.75rem;
  color: var(--d-accent-color);
  font-family: var(--d-heading-font);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.7;
}

/* Code repository section */
.code-repo {
  background-color: var(--d-code-bg);
  padding: 1.5rem;
  border-radius: var(--d-radius-lg);
  margin: 1.5rem 0;
  border: 1px solid var(--d-border-color);
}

.code-repo h4 {
  margin-top: 0;
  margin-bottom: 1rem;
  color: var(--d-accent-color);
  font-size: 1.125rem;
}

.code-repo ul {
  margin-bottom: 0;
  padding-left: 1.25rem;
}

/* Section divider */
.section-divider {
  text-align: center;
  margin: 2rem 0;
  position: relative;
}

.section-divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--d-border-color);
}

.section-divider span {
  background-color: var(--d-page-bg);
  padding: 0 1.5rem;
  color: var(--d-muted-text);
  font-size: 0.875rem;
  font-style: italic;
}

/* Utility classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--d-spacing-sm); }
.mb-2 { margin-bottom: var(--d-spacing-md); }
.mb-3 { margin-bottom: var(--d-spacing-lg); }
.mb-4 { margin-bottom: var(--d-spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--d-spacing-sm); }
.mt-2 { margin-top: var(--d-spacing-md); }
.mt-3 { margin-top: var(--d-spacing-lg); }
.mt-4 { margin-top: var(--d-spacing-xl); }

/* Responsive Design */

/* Large desktop */
@media (min-width: 1400px) {
  d-contents {
    position: fixed;
    right: calc((100vw - var(--d-content-width)) / 2 - var(--d-sidebar-width) - 3rem);
    top: 2rem;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
  }

  d-title h1 {
    font-size: 2.5rem;
  }
}

/* Extra large desktop */
@media (min-width: 1600px) {
  d-contents {
    right: calc((100vw - var(--d-content-width)) / 2 - var(--d-sidebar-width) - 4rem);
  }

  d-title h1 {
    font-size: 2.75rem;
  }
}

/* Tablet and smaller desktop */
@media (max-width: 1200px) {
  d-contents {
    position: static;
    width: 100%;
    border-left: none;
    border-bottom: 1px solid var(--d-border-color);
    padding: 1.5rem;
    margin: 0 0 2rem 0;
    background-color: var(--d-code-bg);
    border-radius: var(--d-radius-md);
  }

  d-contents nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
  }

  d-appendix {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  d-appendix .sidebar {
    grid-column: 1;
    order: 2;
  }

  d-title h1 {
    font-size: 2rem;
  }
}

/* Mobile */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  body {
    font-size: 1rem;
  }

  d-article {
    padding: 0 1rem 2rem;
  }

  d-title {
    padding: 2rem 0 1.5rem;
  }

  d-title h1 {
    font-size: 2rem;
  }

  d-title .subtitle {
    font-size: 1.125rem;
  }

  d-title .authors {
    gap: 1rem;
  }

  d-contents nav {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  h4 { font-size: 1.125rem; }

  .citation-popup {
    width: 250px;
    font-size: 0.8rem;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  d-title h1 {
    font-size: 1.625rem;
  }

  d-title .subtitle {
    font-size: 1rem;
  }

  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.375rem; }
  h3 { font-size: 1.125rem; }

  pre {
    padding: 1rem;
    font-size: 0.8rem;
  }

  .abstract {
    padding: 1.5rem;
  }
}

/* Print styles */
@media print {
  html {
    font-size: 12pt;
    line-height: 1.4;
  }

  body {
    font-family: 'Times New Roman', serif;
    color: black;
    background: white;
  }

  d-title h1 {
    font-size: 18pt;
    page-break-after: avoid;
  }

  h2 {
    font-size: 14pt;
    page-break-before: auto;
    page-break-after: avoid;
  }

  h3, h4 {
    page-break-after: avoid;
  }

  d-contents,
  d-byline,
  .citation-popup {
    display: none;
  }

  img, table, pre {
    page-break-inside: avoid;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  .abstract,
  .citation,
  .code-repo {
    background-color: white;
    border: 1px solid #ccc;
    box-shadow: none;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Custom scrollbar for webkit browsers */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--d-code-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--d-border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--d-muted-text);
}