/* ============================================
   CSS Variables for Light/Dark Themes
   ============================================ */

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-card: #ffffff;
  --text-primary: #000000;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border-color: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --accent-color: #000000;
  --link-color: #000000;
  --link-hover: #666666;
  --code-bg: #f5f5f5;
  --highlight-bg: #d4edda;
  --highlight-text: #155724;
  --highlight-border: #28a745;
  --info-bg: #d1ecf1;
  --info-text: #0c5460;
  --info-border: #17a2b8;
  --warning-bg: #fff3cd;
  --warning-text: #856404;
  --warning-border: #ffc107;
  --error-bg: #f8d7da;
  --error-text: #721c24;
  --error-border: #dc3545;
  --success-bg: #d4edda;
  --success-text: #155724;
  --success-border: #28a745;
}

[data-theme="dark"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-card: #1a1a1a;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --text-muted: #707070;
  --border-color: #2a2a2a;
  --shadow-color: rgba(255, 255, 255, 0.05);
  --accent-color: #e0e0e0;
  --link-color: #e0e0e0;
  --link-hover: #ffffff;
  --code-bg: #1a1a1a;
  --highlight-bg: #1e3a28;
  --highlight-text: #7ce3a0;
  --highlight-border: #4ade80;
  --info-bg: #1a2e35;
  --info-text: #7dd3e3;
  --info-border: #3b9fb8;
  --warning-bg: #3a3420;
  --warning-text: #ffd966;
  --warning-border: #e6b800;
  --error-bg: #3a1f20;
  --error-text: #ff9999;
  --error-border: #e64545;
  --success-bg: #1e3a28;
  --success-text: #7ce3a0;
  --success-border: #4ade80;
}

/* ============================================
   Base Styles
   ============================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 1.875rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.5rem;
  margin-top: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

a {
  color: var(--link-color);
  text-decoration: underline;
  transition: color 0.2s ease;
}

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

code, pre {
  font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
  font-size: 0.9em;
}

/* Inline code */
code {
  background-color: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  color: var(--text-primary);
}

/* Code blocks */
pre {
  background-color: var(--code-bg);
  padding: 1.25rem;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
  line-height: 1.5;
}

pre code {
  background-color: transparent;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.875rem;
}

/* Syntax highlighting with Rouge */
.highlight {
  background-color: var(--code-bg);
  border-radius: 6px;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
}

.highlight pre {
  margin: 0;
  border: none;
  background-color: transparent;
}

/* Scrollbar for code blocks */
pre::-webkit-scrollbar {
  height: 8px;
}

pre::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 4px;
}

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

pre::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Lists */
ul, ol {
  margin-bottom: 1rem;
  padding-left: 2rem;
}

ul {
  list-style-type: disc;
}

ol {
  list-style-type: decimal;
}

li {
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

ul ul, ol ul {
  list-style-type: circle;
}

ul ol, ol ol {
  list-style-type: lower-alpha;
}

/* MathJax Display Equations */
.MJXc-display, .MathJax_Display {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  padding: 0.5rem 0;
}

mjx-container[display="true"] {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  display: block !important;
  padding: 0.5rem 0;
}

/* Scrollbar styling for equations */
.MJXc-display::-webkit-scrollbar,
.MathJax_Display::-webkit-scrollbar,
mjx-container[display="true"]::-webkit-scrollbar {
  height: 6px;
}

.MJXc-display::-webkit-scrollbar-track,
.MathJax_Display::-webkit-scrollbar-track,
mjx-container[display="true"]::-webkit-scrollbar-track {
  background: var(--bg-secondary);
  border-radius: 3px;
}

.MJXc-display::-webkit-scrollbar-thumb,
.MathJax_Display::-webkit-scrollbar-thumb,
mjx-container[display="true"]::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.MJXc-display::-webkit-scrollbar-thumb:hover,
.MathJax_Display::-webkit-scrollbar-thumb:hover,
mjx-container[display="true"]::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

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

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: calc(100vh - 200px);
}

/* ============================================
   Header & Navigation
   ============================================ */

.site-header {
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: border-color 0.3s ease, background-color 0.3s ease;
}

.nav {
  max-width: 800px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
}

.nav-title {
  font-family: "SF Mono", Monaco, monospace;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a i {
  font-size: 0.9em;
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease;
  font-size: 1.1rem;
}

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

.theme-toggle .sun-icon {
  display: none;
}

.theme-toggle .moon-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: none;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  margin-top: 0rem;
  transition: border-color 0.3s ease;
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  text-align: center;
}

.footer-links {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-links a i {
  font-size: 0.9em;
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: "SF Mono", Monaco, monospace;
}

/* ============================================
   Cards (Publications, Blog Posts)
   ============================================ */

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border-radius: 4px;
  box-shadow: 3px 3px 0px var(--shadow-color);
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 5px 5px 0px var(--shadow-color);
  transform: translateY(-2px);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
  font-family: Georgia, serif;
}

.card-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  font-family: "SF Mono", Monaco, monospace;
}

.card-description {
  color: var(--text-primary);
  line-height: 1.6;
}

/* ============================================
   Bio Section
   ============================================ */

.bio {
  margin-bottom: 0rem;
}

.bio-intro {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.bio-image-container {
  flex-shrink: 0;
}

.bio-image {
  width: 225px;
  height: 225px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border-color);
  transition: border-color 0.3s ease;
}

.bio-text {
  flex: 1;
  min-width: 0;
}

.bio-header {
  margin-bottom: 1.5rem;
}

.bio-title {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

.bio-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  font-family: "SF Mono", Monaco, monospace;
  margin-bottom: 0;
}

.bio-content {
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 0rem;
}

.bio-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

.bio-link {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  text-decoration: none;
  color: var(--text-primary);
  font-size: 0.9rem;
  border-radius: 4px;
  transition: all 0.2s ease;
  font-family: "SF Mono", Monaco, monospace;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.bio-link:hover {
  background-color: var(--bg-secondary);
  box-shadow: 2px 2px 0px var(--shadow-color);
}

.bio-link i {
  font-size: 0.9em;
}

/* ============================================
   Publications
   ============================================ */

.publication {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.publication:last-child {
  border-bottom: none;
}

.publication-title {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.publication-authors {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.publication-venue {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 0.5rem;
}

.publication-note {
  display: inline-block;
  background-color: var(--highlight-bg);
  color: var(--highlight-text);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  font-size: 0.8rem;
  font-style: normal;
  font-family: "SF Mono", Monaco, monospace;
  font-weight: 600;
  margin-left: 0.5rem;
  border: 1px solid var(--highlight-border);
}

.publication-links {
  display: flex;
  gap: 0.75rem;
  font-size: 0.85rem;
  font-family: "SF Mono", Monaco, monospace;
  flex-wrap: wrap;
}

.publication-links a {
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.publication-links a:hover {
  border-bottom-color: var(--text-secondary);
}

.publication-links a i {
  font-size: 0.9em;
}

.collapsible-content {
  margin-top: 1rem;
  padding: 1rem;
  background-color: var(--bg-secondary);
  border-left: 3px solid var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

.collapsible-content p {
  margin-bottom: 0;
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 0.95rem;
}

.collapsible-content pre {
  margin-bottom: 0;
  background-color: var(--code-bg);
  font-size: 0.85rem;
  max-height: 300px;
  overflow-y: auto;
}

.collapsible-content pre code {
  font-size: 0.85rem;
  line-height: 1.5;
}

/* ============================================
   Teaching
   ============================================ */

.course {
  margin-bottom: 2rem;
}

.course-title {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.course-meta {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  font-family: "SF Mono", Monaco, monospace;
}

.course-description {
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

/* ============================================
   Blog
   ============================================ */

.post-list {
  list-style: none;
}

.post-item {
  margin-bottom: 2rem;
}

.post-header {
  margin-bottom: 2rem;
}

.post-title {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.post-meta {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-family: "SF Mono", Monaco, monospace;
}

.post-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.post-content img {
  max-width: 100%;
  height: auto;
  margin: 2rem 0;
  border-radius: 4px;
}

.post-tags {
  margin-top: 2rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 3px;
  font-size: 0.85rem;
  font-family: "SF Mono", Monaco, monospace;
  border: 1px solid var(--border-color);
}

.post-navigation {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
}

.post-navigation a {
  color: var(--text-secondary);
  text-decoration: none;
}

.post-navigation a:hover {
  color: var(--text-primary);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
  .nav {
    padding: 1rem 1.5rem;
  }

  .nav-links {
    gap: 0.75rem;
  }

  .nav-links a span {
    display: inline;
  }

  .bio-intro {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.5rem;
  }

  .bio-image {
    width: 150px;
    height: 150px;
  }

  .bio-text {
    width: 100%;
  }

  .bio-title {
    font-size: 2rem;
  }

  .bio-subtitle {
    font-size: 1rem;
  }

  .bio-content {
    text-align: left;
  }

  .bio-links {
    justify-content: center;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .container {
    padding: 1.5rem 1rem;
  }

  .card {
    padding: 1rem;
  }

  .footer-links {
    gap: 0.75rem;
  }

  .post-navigation {
    flex-direction: column;
    gap: 1rem;
  }
}

/* Even smaller screens */
@media (max-width: 480px) {
  .nav-links a span {
    display: none;
  }

  .nav-links a {
    font-size: 1.1rem;
  }

  .nav-links {
    gap: 1.25rem;
  }

  .bio-image {
    width: 120px;
    height: 120px;
  }

  .bio-title {
    font-size: 1.75rem;
  }

  .bio-subtitle {
    font-size: 0.9rem;
  }

  .bio-link {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
  }

  .footer-links a {
    font-size: 0.85rem;
  }
}

/* ============================================
   Prompt / Alert Boxes
   ============================================ */

.prompt {
  padding: 1rem 1rem 1rem 3rem;
  margin-bottom: 1.5rem;
  border-left: 4px solid;
  border-radius: 4px;
  position: relative;
  font-size: 0.95rem;
  line-height: 1.6;
}

.prompt::before {
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  position: absolute;
  left: 1rem;
  top: 1rem;
  font-size: 1.1rem;
}

.prompt p:last-child {
  margin-bottom: 0;
}

.prompt-info {
  background-color: var(--info-bg);
  color: var(--info-text);
  border-left-color: var(--info-border);
}

.prompt-info::before {
  content: "\f05a";
  color: var(--info-border);
}

.prompt-warning {
  background-color: var(--warning-bg);
  color: var(--warning-text);
  border-left-color: var(--warning-border);
}

.prompt-warning::before {
  content: "\f071";
  color: var(--warning-border);
}

.prompt-error {
  background-color: var(--error-bg);
  color: var(--error-text);
  border-left-color: var(--error-border);
}

.prompt-error::before {
  content: "\f06a";
  color: var(--error-border);
}

.prompt-success {
  background-color: var(--success-bg);
  color: var(--success-text);
  border-left-color: var(--success-border);
}

.prompt-success::before {
  content: "\f058";
  color: var(--success-border);
}

.prompt-tip {
  background-color: var(--success-bg);
  color: var(--success-text);
  border-left-color: var(--success-border);
}

.prompt-tip::before {
  content: "\f0eb";
  color: var(--success-border);
}

/* ============================================
   Syntax Highlighting (Rouge)
   ============================================ */

/* Light mode syntax highlighting */
:root {
  --syntax-comment: #6a737d;
  --syntax-keyword: #d73a49;
  --syntax-string: #032f62;
  --syntax-function: #6f42c1;
  --syntax-variable: #e36209;
  --syntax-number: #005cc5;
  --syntax-operator: #d73a49;
  --syntax-class: #6f42c1;
}

/* Dark mode syntax highlighting */
[data-theme="dark"] {
  --syntax-comment: #8b949e;
  --syntax-keyword: #ff7b72;
  --syntax-string: #a5d6ff;
  --syntax-function: #d2a8ff;
  --syntax-variable: #ffa657;
  --syntax-number: #79c0ff;
  --syntax-operator: #ff7b72;
  --syntax-class: #d2a8ff;
}

/* Rouge syntax highlighting classes */
.highlight .c,    /* Comment */
.highlight .cm,   /* Comment.Multiline */
.highlight .cp,   /* Comment.Preproc */
.highlight .c1,   /* Comment.Single */
.highlight .cs {  /* Comment.Special */
  color: var(--syntax-comment);
  font-style: italic;
}

.highlight .k,    /* Keyword */
.highlight .kc,   /* Keyword.Constant */
.highlight .kd,   /* Keyword.Declaration */
.highlight .kn,   /* Keyword.Namespace */
.highlight .kp,   /* Keyword.Pseudo */
.highlight .kr,   /* Keyword.Reserved */
.highlight .kt {  /* Keyword.Type */
  color: var(--syntax-keyword);
  font-weight: 600;
}

.highlight .s,    /* String */
.highlight .sb,   /* String.Backtick */
.highlight .sc,   /* String.Char */
.highlight .sd,   /* String.Doc */
.highlight .s2,   /* String.Double */
.highlight .se,   /* String.Escape */
.highlight .sh,   /* String.Heredoc */
.highlight .si,   /* String.Interpol */
.highlight .sx,   /* String.Other */
.highlight .sr,   /* String.Regex */
.highlight .s1,   /* String.Single */
.highlight .ss {  /* String.Symbol */
  color: var(--syntax-string);
}

.highlight .nf,   /* Name.Function */
.highlight .fm {  /* Name.Function.Magic */
  color: var(--syntax-function);
  font-weight: 600;
}

.highlight .na,   /* Name.Attribute */
.highlight .nb,   /* Name.Builtin */
.highlight .bp {  /* Name.Builtin.Pseudo */
  color: var(--syntax-variable);
}

.highlight .m,    /* Number */
.highlight .mf,   /* Number.Float */
.highlight .mh,   /* Number.Hex */
.highlight .mi,   /* Number.Integer */
.highlight .mo,   /* Number.Oct */
.highlight .il {  /* Number.Integer.Long */
  color: var(--syntax-number);
}

.highlight .o,    /* Operator */
.highlight .ow {  /* Operator.Word */
  color: var(--syntax-operator);
  font-weight: 600;
}

.highlight .nc,   /* Name.Class */
.highlight .ne,   /* Name.Exception */
.highlight .nn {  /* Name.Namespace */
  color: var(--syntax-class);
  font-weight: 600;
}

.highlight .nv,   /* Name.Variable */
.highlight .vc,   /* Name.Variable.Class */
.highlight .vg,   /* Name.Variable.Global */
.highlight .vi {  /* Name.Variable.Instance */
  color: var(--syntax-variable);
}

.highlight .nt {  /* Name.Tag */
  color: var(--syntax-keyword);
}

.highlight .err {  /* Error */
  color: var(--error-text);
  background-color: var(--error-bg);
}

.highlight .gd {  /* Generic.Deleted */
  color: var(--error-text);
  background-color: var(--error-bg);
}

.highlight .gi {  /* Generic.Inserted */
  color: var(--success-text);
  background-color: var(--success-bg);
}

.highlight .gh,   /* Generic.Heading */
.highlight .gu {  /* Generic.Subheading */
  color: var(--text-primary);
  font-weight: bold;
}

.highlight .ge {  /* Generic.Emph */
  font-style: italic;
}

.highlight .gs {  /* Generic.Strong */
  font-weight: bold;
}

/* ============================================
   Utilities
   ============================================ */

.text-center {
  text-align: center;
}

.mt-4 {
  margin-top: 2rem;
}

.mb-4 {
  margin-bottom: 2rem;
}