/* ET Book web font */
@import url('https://edwardtufte.github.io/et-book/et-book.css');

/* Smooth scrolling for anchor links */
html {
  scroll-behavior: smooth;
}

/* Minimal academic blog styles - inspired by traditional academic papers */
:root {
  --max-width: 42em;  /* Narrower for focused reading */
  --text-color: #444;
  --heading-color: #111;
  --bg-color: #fefefe;  /* Warmer off-white */
  --link-color: #0645ad;  /* Traditional academic blue */
  --link-visited: #0b0080;  /* Traditional visited purple */
  --link-hover: #06e;
  --code-bg: #f9f8f6;
  --border-color: #ddd;
  --blockquote-color: #666;
  --meta-color: #666;
}

/* Dark mode - manual toggle */
[data-theme="dark"] {
  --text-color: #ddd;
  --heading-color: #eee;
  --bg-color: #1a1a1a;
  --link-color: #69b7ff;
  --link-visited: #b19cd9;
  --link-hover: #89cff0;
  --code-bg: #2a2a2a;
  --border-color: #444;
  --blockquote-color: #aaa;
  --meta-color: #999;
}

[data-theme="dark"] .post-entry:hover {
  background: rgba(255, 255, 255, 0.02);
}

[data-theme="dark"] .sequence-box:hover {
  background: rgba(255, 255, 255, 0.02);
}

/* Full-width image and caption styling */
.full-width-figure {
  width: 100%;
  margin-top: 2em;
  margin-bottom: 2em;
  text-align: center;
}

.full-width-figure img {
  max-width: 100%;
  height: auto;
}

.figure-caption {
  font-size: 0.85em;
  color: var(--meta-color);
  margin-top: 0.75em;
  padding: 0 2em;
  line-height: 1.4;
}

/* Sequence header styling */
.sequence-header {
  text-align: center;
  margin-bottom: 2em;
}

.sequence-name {
  font-size: 2.5em;
  font-weight: bold;
  color: var(--heading-color);
  margin: 0;
  line-height: 1.2;
}

/* Banner image styling */
.banner-image {
  margin-top: 1em;
  margin-bottom: 1em;
}

/* Theme toggle button */
.theme-toggle {
  position: fixed;
  top: 1.8em;
  right: 1.5em;
  background: none;
  border: none;
  font-size: 1.2em;
  color: var(--meta-color);
  cursor: pointer;
  z-index: 100;
  transition: color 0.2s ease;
  line-height: 1;
  padding: 0;
  margin: 0;
}

.theme-toggle:hover {
  color: var(--link-hover);
}

/* Base styles */
body {
  font-family: 'et-book', 'ETBookOT', 'ET Book', Georgia, 'Times New Roman', serif;
  font-size: 18px;  /* Slightly smaller than their 20px for better screen reading */
  line-height: 1.7;
  color: var(--text-color);
  background: var(--bg-color);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2em;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--heading-color);
  line-height: 1.25;
  margin-top: 1.4em;
  margin-bottom: 0.5em;
  font-weight: normal;  /* More elegant, less bold */
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.2em;
}

h1 { 
  font-size: 1.8em;
  text-align: left;  /* Left-align titles */
  margin-bottom: 0.5em;
}
h2 { font-size: 1.4em; }
h3 { font-size: 1.2em; }
h4 { font-size: 1.1em; font-weight: bold; }
h5 { font-size: 1em; font-weight: bold; }
h6 { font-size: 0.9em; font-weight: bold; }

/* Paragraphs */
p {
  margin: 1em 0;
  text-align: left;
  hyphens: none;
}

/* Links - traditional academic colors */
a {
  color: var(--link-color);
  text-decoration: none;
}

a:visited {
  color: var(--link-visited);
}

a:hover {
  color: var(--link-hover);
}

/* Code blocks */
pre {
  background: var(--code-bg);
  padding: 1em;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: 2px;
  font-size: 0.9em;
  line-height: 1.4;
}

code {
  font-family: Menlo, Monaco, 'Lucida Console', Consolas, monospace;
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 2px;
}

pre code {
  background: none;
  padding: 0;
  font-size: 1em;
}

/* Blockquotes */
blockquote {
  margin: 1em 0;
  padding-left: 1em;
  border-left: 3px solid var(--border-color);
  color: var(--blockquote-color);
  font-style: italic;
}

/* Math display and inline - scale to match ET Book font size */
.katex {
  font-size: 1.05em; /* Scale down math to match text better */
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 1em 0;
}

/* Sequence navigation */
.sequence-nav {
  color: var(--text-color);
  font-size: 0.9em;
  margin-bottom: 1em;
  font-weight: normal;
}

/* Separator lines for post headers */
.title-separator {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 1.5em 0 1em 0;
}

.metadata-separator {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 1em 0 2em 0;
}

/* Article metadata */
.metadata {
  color: var(--meta-color);
  font-size: 0.9em;
  text-align: left;
  margin-bottom: 0;
  font-style: italic;
}

/* Post list on index */
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

/* Date headers */
.date-header {
  margin-top: 3em;
  margin-bottom: 1em;
  padding-bottom: 0.5em;
  text-transform: uppercase;
  font-weight: bold;
  font-size: 0.8em;
  color: var(--meta-color);
  border-bottom: 1px solid var(--meta-color);
}

.date-header:first-child {
  margin-top: 0;
}

/* Post entries */
.post-entry {
  display: block;
  text-decoration: none;
  color: var(--text-color);
  background: var(--code-bg);
  padding: 1.5em;
  margin-bottom: 0.5em;
  border-left: 3px solid transparent;
  transition: all 0.2s ease;
}

.post-entry:hover {
  border-left-color: var(--meta-color);
  background: rgba(0, 0, 0, 0.02);  /* Very subtle background change */
}

.post-entry h3 {
  font-size: 1.15em;
  margin: 0 0 0.5em 0;
  color: var(--heading-color);
  font-weight: normal;
  transition: color 0.2s ease;
}

.post-entry:hover h3 {
  color: var(--link-color);
}

.post-byline {
  font-style: italic;
  color: var(--meta-color);
  margin-bottom: 0.5em;
  font-size: 0.9em;
}

.post-description {
  color: var(--text-color);
  line-height: 1.5;
  font-size: 0.95em;
}

/* Sequence boxes */
.sequence-box {
  display: block;
  text-decoration: none;
  color: var(--text-color);
  background: var(--code-bg);
  padding: 1.5em;
  margin-bottom: 2em;
  border-left: 3px solid transparent;
  transition: all 0.2s ease;
  cursor: pointer;
}

.sequence-box:hover {
  border-left-color: var(--meta-color);
  background: rgba(0, 0, 0, 0.02);  /* Very subtle background change */
}

.sequence-title {
  font-size: 1.15em;
  margin: 0 0 0.5em 0;
  color: var(--heading-color);
  font-weight: normal;
  transition: color 0.2s ease;
}

.sequence-box:hover .sequence-title {
  color: var(--link-color);
}

.sequence-author {
  font-style: italic;
  color: var(--meta-color);
  margin-bottom: 0.2em;
  font-size: 0.9em;
}

.sequence-date {
  color: var(--meta-color);
  margin-bottom: 1em;
  font-size: 0.9em;
}

.sequence-posts {
  display: flex;
  flex-direction: column;
  gap: 0.2em;
  padding-top: 0.5em;
  border-top: 1px solid var(--border-color);
}

.post-link {
  color: var(--text-color);
  text-decoration: none;
  padding: 0.2em 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.9em;
  transition: color 0.2s ease;
}

.post-link:last-child {
  border-bottom: none;
}

.post-link:hover {
  color: var(--link-color);
}

/* Horizontal rule */
hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 3em 0;
}

/* About section */
.about-section {
  margin-top: 2em;
}

.about-section h2 {
  font-size: 1.4em;
  margin-bottom: 1em;
}

.about-section p {
  margin-bottom: 1em;
}

.about-section ul {
  display: grid;
  grid-template-columns: 1fr 1fr;
  row-gap: 0.3em;  /* Tighter vertical spacing */
  column-gap: 2em;  /* Horizontal spacing between columns */
  list-style: none;
  padding: 0;
  margin: 0;
}

.about-section ul li {
  margin: 0;
}

/* Home glyph on posts */
.home-glyph {
  position: fixed;
  top: 1.5em;
  right: 4em;
  font-size: 1.2em;
  color: var(--meta-color);
  text-decoration: none;
  z-index: 100;
  transition: color 0.2s ease;
}

.home-glyph:visited {
  color: var(--meta-color);
}

.home-glyph:hover {
  color: var(--link-hover);
}

/* Header on homepage */
header h1 {
  margin-bottom: 0.2em;
  border-bottom: none;
  padding-bottom: 0;
}

.site-subtitle {
  text-align: left;
  font-style: italic;
  color: var(--meta-color);
  margin: 0.5em 0 0 0;
  font-size: 1.1em;
}

/* Header separators for homepage */
.header-separator {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 1.5em 0;
}

/* Site description */
.site-description {
  margin: 0;
}

.site-description p {
  margin: 0;
  text-align: left;
  font-style: normal;
  line-height: 1.6;
}

/* Box environments for open questions */
.question-box {
  border: 2px solid rgb(128, 128, 128);
  padding: 1em;
  margin: 1.5em 0;
  background: var(--code-bg);
}

.question-box p {
  margin: 0;
}

/* Sequence TOC at end of posts */
.sequence-toc {
  margin: 3em 0 2em 0;
  padding: 1.5em;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
}

.sequence-toc h3 {
  margin-top: 0;
  margin-bottom: 1em;
  border-bottom: none;
  padding-bottom: 0;
}

.sequence-toc ol {
  margin: 0;
  padding-left: 1.5em;
}

.sequence-toc li {
  margin-bottom: 0.3em;
}

.sequence-toc a {
  text-decoration: none;
}

.sequence-toc a:hover {
  text-decoration: underline;
}

.back-to-top {
  text-align: center;
  margin-top: 1em;
}

.back-to-top a {
  font-size: 1.5em;
  color: var(--meta-color);
  text-decoration: none;
}

.back-to-top a:hover {
  color: var(--link-hover);
}

/* Comments section */
.comments {
  margin-top: 3em;
  padding-top: 2em;
}

/* Comments styling */

/* Tables */
table {
  margin: 1em 0;
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9em;
}

table th {
  padding: 0.5em;
  background-color: var(--code-bg);
  border: 1px solid var(--border-color);
  font-weight: bold;
}

table td {
  padding: 0.5em;
  border: 1px solid var(--border-color);
}

/* Selection highlight */
::selection {
  background: rgba(255, 255, 0, 0.3);
  color: #000;
}

/* Footer */
footer {
  margin-top: 4em;
  padding-top: 2em;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.9em;
  color: var(--meta-color);
}

/* Print styles */
@media print {
  body {
    font-size: 12pt;
    max-width: 100%;
    color: black;
    background: white;
  }
  
  a { 
    color: black;
    text-decoration: underline;
  }
  
  nav, .comments, footer {
    display: none;
  }
}

/* Responsive */
@media (max-width: 768px) {
  body {
    font-size: 16px;
    padding: 1em;
  }
  
  p {
    text-align: left;  /* Easier to read on mobile */
  }
  
  h1 { font-size: 1.5em; }
  h2 { font-size: 1.25em; }
  h3 { font-size: 1.1em; }
  
  .about-section ul {
    grid-template-columns: 1fr;  /* Single column on mobile */
  }
  
  .post-entry {
    padding: 1em;
  }
  
  .post-entry h3 {
    font-size: 1.05em;
  }
}