@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,500;1,400&family=JetBrains+Mono:wght@400&display=swap');

:root {
  --bg:       #faf9f7;
  --surface:  #f2f0ec;
  --border:   #dddad4;
  --text:     #1a1a18;
  --text-dim: #6b6860;
  --accent:   #2a5298;   /* link blue — classic, readable */
  --code-bg:  #f4f3f0;
  --max-w:    680px;
  --nav-h:    52px;
  --serif:    'EB Garamond', Georgia, serif;
  --mono:     'JetBrains Mono', 'Courier New', monospace;
}

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

html { font-size: 19px; scroll-behavior: smooth; }

body {
  background:  var(--bg);
  color:       var(--text);
  font-family: var(--serif);
  line-height: 1.75;
  min-height:  100vh;
  display:     flex;
  flex-direction: column;
}

/* ── Nav ── */
nav {
  height:        var(--nav-h);
  border-bottom: 1px solid var(--border);
  background:    var(--bg);
  position:      sticky;
  top:           0;
  z-index:       10;
}
.nav-inner {
  max-width: var(--max-w);
  height:    100%;
  margin:    0 auto;
  padding:   0 1.5rem;
  display:   flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-family:     var(--serif);
  font-size:       1.05rem;
  font-weight:     500;
  color:           var(--text);
  text-decoration: none;
}
.nav-brand:hover { color: var(--accent); }
.nav-links { list-style: none; display: flex; gap: 1.75rem; }
.nav-links a {
  font-family:     var(--mono);
  font-size:       0.65rem;
  letter-spacing:  0.08em;
  text-transform:  uppercase;
  color:           var(--text-dim);
  text-decoration: none;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }

/* ── Main ── */
main {
  flex:      1;
  max-width: var(--max-w);
  width:     100%;
  margin:    0 auto;
  padding:   3.5rem 1.5rem 5rem;
}

/* ── Typography ── */
h1 { font-family: var(--serif); font-weight: 400; font-size: 2.2rem; line-height: 1.15; margin-bottom: 0.4rem; }
h2 { font-family: var(--serif); font-weight: 400; font-size: 1.4rem; margin-top: 2.8rem; margin-bottom: 0.6rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
h3 { font-family: var(--serif); font-weight: 400; font-size: 1.1rem; font-style: italic; margin-top: 1.8rem; margin-bottom: 0.3rem; color: var(--text-dim); }
p  { margin-bottom: 1.1rem; }
a  { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
a:hover { text-decoration: none; }
strong { font-weight: 500; }
em { font-style: italic; }
hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }
ul, ol { padding-left: 1.4rem; margin-bottom: 1.1rem; }
li { margin-bottom: 0.2rem; }

/* ── Code ── */
code {
  font-family:   var(--mono);
  font-size:     0.75em;
  background:    var(--code-bg);
  border:        1px solid var(--border);
  border-radius: 3px;
  padding:       0.1em 0.35em;
  color:         var(--text);
}
pre {
  background:    var(--code-bg);
  border:        1px solid var(--border);
  border-radius: 4px;
  padding:       1.1rem 1.3rem;
  overflow-x:    auto;
  margin:        1.4rem 0;
  line-height:   1.55;
}
pre code {
  background: none;
  border:     none;
  padding:    0;
  font-size:  0.78rem;
}

/* ── MathJax ── */
mjx-container[display="true"] {
  overflow-x: auto;
  margin: 1.4rem 0 !important;
  padding: 0.2rem 0;
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding:    1.25rem 1.5rem;
  text-align: center;
}
footer p {
  font-family: var(--mono);
  font-size:   0.62rem;
  letter-spacing: 0.06em;
  color:       var(--text-dim);
}

/* ── Homepage ── */
.hero {
  padding-bottom: 2.5rem;
  border-bottom:  1px solid var(--border);
  margin-bottom:  2.5rem;
}
.hero h1 { margin-bottom: 0.75rem; }
.hero-lead { color: var(--text-dim); font-size: 1rem; max-width: 520px; }

.section-label {
  font-family:    var(--mono);
  font-size:      0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color:          var(--text-dim);
  margin-bottom:  0.75rem;
}

/* Project list (used on homepage and projects/index.html) */
.project-list { margin-bottom: 1.5rem; }
.project-item {
  display:        flex;
  justify-content: space-between;
  align-items:    baseline;
  gap:            1rem;
  padding:        0.85rem 0;
  border-bottom:  1px solid var(--border);
  text-decoration: none;
  color:          inherit;
}
.project-item:first-child { border-top: 1px solid var(--border); }
.project-item:hover .item-title { color: var(--accent); }
.item-title {
  font-family: var(--serif);
  font-size:   1rem;
  color:       var(--text);
  transition:  color 0.15s;
}
.item-desc {
  font-size:   0.82rem;
  color:       var(--text-dim);
  margin-top:  0.1rem;
}
.item-tags { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-top: 0.3rem; }
.item-tag {
  font-family:    var(--mono);
  font-size:      0.57rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border:         1px solid var(--border);
  border-radius:  2px;
  padding:        0.1em 0.4em;
  color:          var(--text-dim);
}
.item-date {
  font-family: var(--mono);
  font-size:   0.63rem;
  color:       var(--text-dim);
  white-space: nowrap;
  flex-shrink: 0;
}

.all-link {
  font-family:     var(--mono);
  font-size:       0.65rem;
  letter-spacing:  0.07em;
  text-transform:  uppercase;
  color:           var(--text-dim);
  text-decoration: none;
}
.all-link:hover { color: var(--accent); }

/* ── About page ── */
.page-sub {
  font-family:    var(--mono);
  font-size:      0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color:          var(--text-dim);
  margin-bottom:  2rem;
  display:        block;
}
.interest-grid {
  display:   grid;
  grid-template-columns: 1fr 1fr;
  gap:       1px;
  border:    1px solid var(--border);
  background: var(--border);
  border-radius: 4px;
  overflow:  hidden;
  margin:    1.2rem 0 2rem;
}
.interest-cell { background: var(--bg); padding: 0.9rem 1.1rem; }
.interest-label {
  font-family:    var(--mono);
  font-size:      0.58rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color:          var(--text-dim);
  margin-bottom:  0.2rem;
}
.interest-value { font-size: 0.9rem; }

/* ── Project page ── */
.back-link {
  display:         inline-block;
  font-family:     var(--mono);
  font-size:       0.63rem;
  letter-spacing:  0.07em;
  text-transform:  uppercase;
  color:           var(--text-dim);
  text-decoration: none;
  margin-bottom:   2rem;
}
.back-link:hover { color: var(--accent); }

.project-header {
  padding-bottom: 1.5rem;
  border-bottom:  1px solid var(--border);
  margin-bottom:  2rem;
}
.project-meta {
  font-family:  var(--mono);
  font-size:    0.63rem;
  color:        var(--text-dim);
  margin-top:   0.6rem;
  display:      flex;
  flex-wrap:    wrap;
  gap:          0.4rem 1.5rem;
}
.tag-list { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.6rem; }
.tag {
  font-family:    var(--mono);
  font-size:      0.57rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border:         1px solid var(--border);
  border-radius:  2px;
  padding:        0.1em 0.4em;
  color:          var(--text-dim);
}

/* Demo embed */
.demo-wrap {
  margin:        1.8rem 0;
  border:        1px solid var(--border);
  border-radius: 4px;
  overflow:      hidden;
  background:    var(--surface);
}
.demo-label {
  font-family:    var(--mono);
  font-size:      0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color:          var(--text-dim);
  padding:        0.45rem 1rem;
  border-bottom:  1px solid var(--border);
  background:     var(--bg);
}
.demo-body {
  padding:         1.5rem;
  display:         flex;
  justify-content: center;
  background:      #fff;
}

/* ── Responsive ── */
@media (max-width: 580px) {
  html { font-size: 17px; }
  main { padding: 2rem 1.1rem 4rem; }
  .nav-inner { padding: 0 1.1rem; }
  .interest-grid { grid-template-columns: 1fr; }
  .project-item { flex-direction: column; gap: 0.2rem; }
  .item-date { display: none; }
}