/* ============================================================
   Residual Thoughts — Custom Styles
   Scholarly, refined aesthetic for mechanistic interpretability research
   ============================================================ */

/* --- Global & Typography --- */

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  line-height: 1.75;
  font-size: 1.05rem;
  color: #2d2d2d;
  background-color: #fafaf8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6,
.navbar-title,
.listing-title,
.quarto-title h1.title {
  font-family: 'Source Sans 3', 'Segoe UI', Roboto, sans-serif;
  font-weight: 600;
  color: #1a1a2e;
  letter-spacing: -0.01em;
}

h1 { font-size: 2.1rem; margin-top: 2rem; margin-bottom: 1rem; }
h2 { font-size: 1.6rem; margin-top: 2.5rem; margin-bottom: 0.75rem; padding-bottom: 0.3rem; border-bottom: 1px solid #e0ddd5; }
h3 { font-size: 1.3rem; margin-top: 2rem; margin-bottom: 0.6rem; }

.quarto-title .quarto-title-subtitle {
  font-family: 'Source Serif 4', Georgia, serif;
  font-style: italic;
  font-size: 1.15rem;
  color: #555;
  margin-top: 0.25rem;
}

p {
  margin-bottom: 1.1rem;
}

strong {
  font-weight: 600;
  color: #1a1a2e;
}

ul, ol {
  margin-bottom: 1.1rem;
}

li {
  margin-bottom: 0.3rem;
}

::selection {
  background-color: #d6e4f0;
  color: #1a1a2e;
}

hr {
  border: none;
  border-top: 1px solid #e0ddd5;
  margin: 2rem 0;
}

/* --- Links --- */

a {
  color: #2c5f7c;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-bottom-color 0.15s ease;
}

a:hover {
  color: #1a3f5c;
  border-bottom-color: #1a3f5c;
}

/* --- Title Block --- */

.quarto-title-block {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid #e0ddd5;
}

.quarto-title h1.title {
  font-size: 2.2rem;
  line-height: 1.25;
  margin-bottom: 0.3rem;
}

.quarto-title-meta {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.9rem;
  color: #666;
  margin-top: 0.75rem;
}

/* --- Figures & Captions --- */

.quarto-float.quarto-figure {
  margin: 2rem auto;
  max-width: 95%;
}

.quarto-float .figure-img,
.quarto-figure .figure-img {
  border: 1px solid #e0ddd5;
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: box-shadow 0.2s ease;
}

.quarto-float .figure-img:hover,
.quarto-figure .figure-img:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.10);
}

.quarto-float-caption,
figcaption {
  text-align: center;
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.88rem;
  color: #555;
  line-height: 1.5;
  padding: 0.6rem 1.5rem 0;
  margin-top: 0.5rem;
}

/* --- Callout Boxes --- */

.callout {
  border-radius: 4px;
  border: none;
  margin: 1.5rem 0;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.callout-header {
  font-family: 'Source Sans 3', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.6rem 1rem;
  border-radius: 4px 4px 0 0;
}

.callout-body-container {
  padding: 0.75rem 1rem 1rem;
  font-size: 0.95rem;
}

.callout-note {
  border-left: 4px solid #4a7c9b;
  background-color: #f4f7fa;
}
.callout-note .callout-header {
  background-color: #eaf0f6;
  color: #2c5f7c;
}

.callout-tip {
  border-left: 4px solid #5a8a6a;
  background-color: #f4f8f5;
}
.callout-tip .callout-header {
  background-color: #e8f2eb;
  color: #3a6a4a;
}

.callout-warning {
  border-left: 4px solid #b8860b;
  background-color: #fdf8ef;
}
.callout-warning .callout-header {
  background-color: #f8f0dc;
  color: #7a5a08;
}

.callout-important {
  border-left: 4px solid #b04040;
  background-color: #fdf4f4;
}
.callout-important .callout-header {
  background-color: #f8e8e8;
  color: #8a2020;
}

/* --- Navigation Bar --- */

.navbar {
  background-color: #1a1a2e !important;
  border-bottom: 1px solid #2a2a4e;
  padding: 0.6rem 0;
  font-family: 'Source Sans 3', sans-serif;
}

.navbar-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #f0ece4 !important;
}

.navbar .nav-link,
.navbar .menu-text {
  font-size: 0.92rem;
  font-weight: 400;
  color: #c8c4bc !important;
  transition: color 0.15s ease;
  letter-spacing: 0.01em;
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
  color: #ffffff !important;
}

.navbar .nav-link.active {
  border-bottom: 2px solid #7ba3c0;
  padding-bottom: 0.3rem;
}

/* --- Footer --- */

footer.footer {
  background-color: #1a1a2e;
  color: #a0a0a0;
  border-top: 1px solid #2a2a4e;
  padding: 1.25rem 0;
  margin-top: 3rem;
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.85rem;
}

.nav-footer {
  color: #a0a0a0;
}

.nav-footer a {
  color: #c8c4bc;
  border-bottom: none;
}

.nav-footer a:hover {
  color: #ffffff;
}

.nav-footer-center p {
  font-style: italic;
  margin: 0;
}

/* --- Post Listing Cards --- */

.quarto-listing-container-default .quarto-post {
  border: 1px solid #e8e5dd;
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  background-color: #ffffff;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.quarto-listing-container-default .quarto-post:hover {
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.07);
  border-color: #d0cdc5;
}

.quarto-post .listing-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.quarto-post .listing-title a {
  color: #1a1a2e;
  border-bottom: none;
}

.quarto-post .listing-title a:hover {
  color: #2c5f7c;
}

.listing-category {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background-color: #eef2f6;
  color: #4a7c9b;
  border: 1px solid #d6dfe8;
  border-radius: 3px;
  padding: 0.15rem 0.5rem;
  margin-right: 0.35rem;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.listing-category:hover {
  background-color: #d6dfe8;
}

.listing-date {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.85rem;
  color: #888;
}

/* --- Tables --- */

.table {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.9rem;
  border-collapse: separate;
  border-spacing: 0;
  width: 100%;
  margin: 1.5rem 0;
}

.table thead th {
  background-color: #1a1a2e;
  color: #f0ece4;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.65rem 0.75rem;
  border-bottom: 2px solid #1a1a2e;
}

.table thead th:first-child {
  border-top-left-radius: 4px;
}

.table thead th:last-child {
  border-top-right-radius: 4px;
}

.table tbody td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid #e8e5dd;
  vertical-align: middle;
}

.table tbody tr:nth-child(even) {
  background-color: #f9f8f5;
}

.table tbody tr:hover {
  background-color: #f0ece4;
}

.table caption,
.quarto-float-tbl .quarto-float-caption {
  text-align: center;
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.88rem;
  color: #555;
  padding: 0.5rem 0;
  caption-side: top;
}

.column-page .table tbody td {
  font-variant-numeric: tabular-nums;
}

/* --- Code Blocks --- */

code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.88em;
  background-color: #f5f3ee;
  border: 1px solid #e8e5dd;
  border-radius: 3px;
  padding: 0.1em 0.35em;
  color: #c7254e;
}

pre {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.85rem;
  background-color: #f8f7f4;
  border: 1px solid #e8e5dd;
  border-radius: 4px;
  padding: 1rem 1.25rem;
  line-height: 1.55;
  overflow-x: auto;
}

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

.code-copy-button {
  border: none;
  background-color: transparent;
  opacity: 0.4;
  transition: opacity 0.15s ease;
}

.code-copy-button:hover {
  opacity: 0.8;
}

/* --- Math (KaTeX) --- */

.math.display {
  display: block;
  margin: 1.5rem 0;
  overflow-x: auto;
  padding: 0.25rem 0;
  font-size: 1.05em;
}

.math.inline {
  font-size: 1.0em;
}

.katex {
  font-size: 1.05em;
}

.katex-display {
  margin: 1.5rem 0;
}

/* --- Table of Contents Sidebar --- */

#TOC {
  font-family: 'Source Sans 3', sans-serif;
  font-size: 0.82rem;
  border-left: 2px solid #e8e5dd;
  padding-left: 1rem;
}

#toc-title {
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #1a1a2e;
  margin-bottom: 0.75rem;
}

#TOC .nav-link {
  color: #666;
  padding: 0.2rem 0;
  border-bottom: none;
  line-height: 1.35;
}

#TOC .nav-link:hover {
  color: #2c5f7c;
}

#TOC .nav-link.active {
  color: #1a1a2e;
  font-weight: 600;
  border-left: 2px solid #2c5f7c;
  margin-left: -1.125rem;
  padding-left: 0.925rem;
}

/* --- Blockquotes --- */

blockquote {
  border-left: 3px solid #4a7c9b;
  margin: 1.5rem 0;
  padding: 0.5rem 1.25rem;
  color: #555;
  font-style: italic;
  background-color: #f9f8f5;
  border-radius: 0 4px 4px 0;
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* --- Section Spacing --- */

section {
  margin-bottom: 1rem;
}

.column-page {
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
}

/* --- Responsive --- */

@media (max-width: 768px) {
  body {
    font-size: 1rem;
    line-height: 1.65;
  }

  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.35rem; }
  h3 { font-size: 1.15rem; }

  .quarto-title h1.title {
    font-size: 1.75rem;
  }

  .quarto-float.quarto-figure {
    max-width: 100%;
    margin: 1.25rem auto;
  }

  .quarto-float-caption,
  figcaption {
    padding: 0.5rem 0.5rem 0;
    font-size: 0.82rem;
  }

  .callout {
    margin: 1rem 0;
  }

  .callout-body-container {
    padding: 0.6rem 0.75rem 0.75rem;
  }

  .column-page {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .quarto-listing-container-default .quarto-post {
    padding: 1rem;
  }
}