:root {
  color-scheme: light;
  --bg: #fbfcfe;
  --bg-soft: #f5f8fb;
  --surface: rgba(255, 255, 255, 0.9);
  --text: #102033;
  --text-strong: #111111;
  --muted: #667187;
  --line: rgba(16, 32, 51, 0.08);
  --underline: rgba(16, 32, 51, 0.12);
  --accent: #2c7a7b;
  --accent-soft: rgba(44, 122, 123, 0.08);
  --shadow: 0 12px 28px rgba(16, 32, 51, 0.05);
  --max: 860px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(44, 122, 123, 0.05), transparent 28%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(16, 32, 51, 0.015) 1px, transparent 1px), linear-gradient(90deg, rgba(16, 32, 51, 0.015) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.08), transparent 80%);
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--underline);
  text-decoration-thickness: 1.2px;
  text-underline-offset: 3px;
}

a:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.wrap {
  width: min(100% - 32px, var(--max));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.header {
  padding: 40px 0 28px;
}

.topline {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  color: var(--muted);
  font-size: 0.86rem;
  letter-spacing: 0.01em;
}

.nav {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  padding: 4px 0;
  text-decoration: underline;
  text-decoration-color: var(--underline);
  text-decoration-thickness: 1.2px;
}

.nav a:hover {
  color: var(--text);
  text-decoration-color: var(--accent);
}

.nav a:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.hero {
  padding: 76px 0 54px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(44, 122, 123, 0.08);
}

h1, h2, h3 {
  margin: 0;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.02;
}

h1 {
  margin-top: 16px;
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  max-width: 12ch;
}

h2 {
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  margin-bottom: 16px;
}

h3 {
  font-size: 1.08rem;
  font-weight: 600;
}

p {
  margin: 0;
  color: var(--text-strong);
  line-height: 1.58;
}

.hero-copy {
  max-width: 46rem;
}

.hero-copy p {
  margin-top: 18px;
  max-width: 40rem;
  font-size: 0.92rem;
}

.hero-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 28px;
  color: var(--muted);
  font-size: 0.88rem;
}

.hero-links a {
  padding-bottom: 2px;
  text-decoration: underline;
  text-decoration-color: var(--underline);
  text-decoration-thickness: 1.2px;
}

.hero-links a:hover {
  color: var(--text);
  text-decoration-color: var(--accent);
}

.hero-links a:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--underline);
  text-decoration-thickness: 1.2px;
  text-underline-offset: 3px;
}

.btn:hover {
  border-color: var(--accent);
  text-decoration-color: var(--accent);
}

.btn:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.project h3 a {
  text-decoration: underline;
  text-decoration-color: var(--underline);
  text-decoration-thickness: 1.2px;
  text-underline-offset: 3px;
}

.project h3 a:hover {
  text-decoration-color: var(--accent);
}

.section {
  padding: 28px 0 10px;
  border-top: 1px solid var(--line);
}

/* Ensure border stays on non-TOC pages */
body:not(.has-toc) .section {
  border-top: 1px solid var(--line) !important;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
  margin-bottom: 18px;
}

.section-head p {
  max-width: 32rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.list {
  display: grid;
  gap: 0;
}

.project,
.post,
.about-row,
.contact-row {
  display: grid;
  grid-template-columns: 92px 1fr auto;
  gap: 18px;
  align-items: start;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.project:last-child,
.post:last-child,
.about-row:last-child,
.contact-row:last-child {
  border-bottom: 0;
}

.thumb {
  width: 92px;
  height: 92px;
  border-radius: 18px;
  background-size: cover;
  background-position: center;
  background-color: #eef2f7;
  border: 1px solid rgba(16, 32, 51, 0.06);
}

.thumb.one {
  background-image: linear-gradient(135deg, rgba(44, 122, 123, 0.14), rgba(16, 32, 51, 0.08)), url("images/Diagram.png");
}

.thumb.two {
  background-image: linear-gradient(135deg, rgba(44, 122, 123, 0.12), rgba(16, 32, 51, 0.08)), url("images/st-eustatius_1911_0002_grayscale.jpg");
}

.thumb.three {
  background-image: linear-gradient(135deg, rgba(44, 122, 123, 0.1), rgba(16, 32, 51, 0.06)), url("images/topicmodelling.png");
}

.project-info {
  margin: 0;
  padding: 0;
}

.project h3,
.post h3 {
  font-size: 0.98rem;
  margin: 0 0 6px 0;
  border-top: 0;
  padding-top: 0;
}

.project .meta,
.post .meta,
.about-row .meta,
.contact-row .meta {
  color: var(--muted);
  font-size: 0.82rem;
  white-space: nowrap;
}

.meta-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: flex-start;
}

.project .date {
  color: var(--muted);
  font-size: 0.82rem;
}

.tagline {
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.toc {
  margin: 0 0 1.3rem;
  padding: 0.8rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(2px);
}

.toc h3 {
  margin: 0 0 0.5rem;
  padding: 0;
  border-top: 0;
  font-size: 0.98rem;
  line-height: 1.35;
}

.toc ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.34rem;
}

.toc li {
  margin: 0;
  padding: 0;
}

.toc li.toc-h4 {
  padding-left: 0.95rem;
  border-left: 1px solid var(--line);
}

.toc a {
  text-decoration: none;
  color: var(--text-strong);
  font-size: 0.92rem;
  line-height: 1.35;
}

.toc a:hover,
.toc a:focus {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Long-form article typography */
article {
  max-width: 78ch;
}

article > * + * {
  margin-top: 0.78rem;
}

article h3,
article h4,
article h5 {
  color: var(--text-strong);
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

article h3 {
  font-size: 1.45rem;
  line-height: 1.25;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

article h4 {
  font-size: 1.22rem;
  line-height: 1.3;
}

article h5 {
  font-size: 1.08rem;
  line-height: 1.35;
}

article p,
article li,
article td,
article th {
  color: var(--text-strong);
  line-height: 1.52;
}

article ul,
article ol {
  margin: 0;
  padding-left: 1.25rem;
}

article li + li {
  margin-top: 0.35rem;
}

article code {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.92em;
}

article p code,
article li code {
  background: #eef3fb;
  color: #0d3366;
  border: 1px solid #d6e0f0;
  border-radius: 4px;
  padding: 0.08rem 0.28rem;
}

/* IDE-style code blocks that track the article width */
article pre {
  margin: 0.9rem 0;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  background: #111827;
  color: #e5e7eb;
  border: 1px solid #2d3748;
  border-radius: 10px;
  box-shadow: 0 8px 18px rgba(17, 24, 39, 0.22);
}

article pre code {
  display: block;
  white-space: pre;
  padding: 0.9rem 1rem;
  line-height: 1.45;
  tab-size: 2;
}

/* Token-level syntax colors (highlight.js classes) */
article pre code.hljs {
  color: #e5e7eb;
}

article pre code .hljs-comment,
article pre code .hljs-quote {
  color: #93a1b3;
  font-style: italic;
}

article pre code .hljs-keyword,
article pre code .hljs-selector-tag,
article pre code .hljs-literal,
article pre code .hljs-built_in,
article pre code .hljs-type {
  color: #f97583;
}

article pre code .hljs-title.function_,
article pre code .hljs-function .hljs-title,
article pre code .hljs-title {
  color: #79c0ff;
}

article pre code .hljs-variable,
article pre code .hljs-attr,
article pre code .hljs-property,
article pre code .hljs-params {
  color: #ffa657;
}

article pre code .hljs-string,
article pre code .hljs-doctag,
article pre code .hljs-regexp {
  color: #a5d6ff;
}

article pre code .hljs-number,
article pre code .hljs-symbol,
article pre code .hljs-bullet {
  color: #79c08f;
}

article pre code .hljs-operator,
article pre code .hljs-punctuation {
  color: #c9d1d9;
}

article pre code.language-python {
  color: #e6edf3;
}

article pre code.language-sql {
  color: #dbeafe;
}

article pre code.language-python::selection,
article pre code.language-sql::selection {
  background: #334155;
}

article table {
  border-collapse: collapse;
  width: min(100%, 78ch);
  font-size: 0.95rem;
}

article th,
article td {
  border: 1px solid var(--line);
  padding: 0.45rem 0.55rem;
  text-align: left;
}

article thead th {
  background: #f1f5fb;
}

.notes {
  display: grid;
  gap: 18px;
  margin-top: 20px;
}

.note {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.note:last-child {
  border-bottom: 0;
}

.note small {
  color: var(--muted);
  white-space: nowrap;
  padding-top: 2px;
  font-size: 0.8rem;
}

.about-copy {
  max-width: 36rem;
}

.about-copy p + p {
  margin-top: 14px;
}

.contact-card {
  display: grid;
  gap: 12px;
  padding: 20px 0 4px;
}

.contact-item {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.contact-item:last-child {
  border-bottom: 0;
}

.footer {
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 0.82rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
  flex-wrap: wrap;
}

@media (max-width: 760px) {
  .topline,
  .section-head,
  .project,
  .about-row,
  .contact-row,
  .note,
  .contact-item,
  .footer-inner {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    justify-content: flex-start;
  }

  .hero {
    padding: 50px 0 34px;
  }

  .project,
  .about-row,
  .contact-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .toc {
    padding: 0.7rem 0.8rem;
  }

  .toc a {
    font-size: 0.88rem;
  }

  .meta {
    white-space: normal;
  }
}

/* TOC Sidebar - In flow on left */
.has-toc .toc-sidebar {
  position: relative;
  width: 220px;
  padding: 0;
  flex: 0 0 220px;
}

.has-toc .toc-sidebar .toc {
  margin: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow);
  position: sticky;
  top: 150px;
  max-height: calc(100vh - 150px - 40px);
  overflow-y: auto;
}

.has-toc .toc-sidebar .toc > h3 {
  margin: 0 0 12px;
  padding: 0;
  border-top: 0;
  font-size: 0.95rem;
  color: var(--text-strong);
}

.has-toc .toc-sidebar .toc > ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.has-toc .toc-sidebar .toc li {
  margin: 0;
  padding: 0;
}

.has-toc .toc-sidebar .toc li a {
  display: flex;
  align-items: center;
  font-size: 0.88rem;
  color: var(--muted);
  padding: 4px 0;
}

.has-toc .toc-sidebar .toc li a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.has-toc .toc-sidebar .toc li ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.has-toc .toc-sidebar .toc li ul.collapsed {
  display: none;
}

.has-toc .toc-sidebar .toc .toc-toggle {
  margin-left: 8px;
  font-size: 0.7rem;
  transition: transform 0.2s;
  display: inline-block;
}

.has-toc .toc-sidebar .toc li.has-children > a {
  cursor: pointer;
}

/* Main container - flex layout for sidebar + content */
.has-toc .main-container {
  display: flex;
  gap: 40px;
  max-width: calc(var(--max) + 260px + 40px);
  margin: 0 auto;
  width: 100%;
  position: relative;
}

.has-toc .main-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  border-top: 1px solid var(--line);
}

.has-toc main.wrap {
  flex: 1;
  margin: 0;
  min-width: 0;
}

.has-toc .section {
  border-top: 0;
  padding-top: 28px;
  padding-bottom: 10px;
}

/* TOC Sidebar - only on pages with .has-toc class */
body:not(.has-toc) .toc-sidebar,
body:not(.has-toc) .main-container {
  display: none;
}

/* Responsive: stack on mobile */
@media (max-width: 900px) {
  .has-toc .main-container {
    flex-direction: column;
  }
  .has-toc .toc-sidebar {
    width: 100%;
    margin-bottom: 24px;
    order: -1;
  }
  .has-toc .toc-sidebar .toc {
    position: static;
    max-height: none;
  }
}