/* ============================================================
   OrchardNumerical — site stylesheet
   Editorial / scholarly minimalism with one warm accent
   ============================================================ */

:root {
  /* Palette */
  --paper:      #fbfaf6;   /* warm off-white background */
  --ink:        #1a1815;   /* deep near-black text */
  --ink-soft:   #4a463f;   /* secondary text */
  --ink-faint:  #8a857a;   /* tertiary, captions */
  --rule:       #d8d2c3;   /* hairlines, borders */
  --rule-soft:  #ebe6d9;   /* subtle dividers */
  --accent:     #357a44;   /* bottle green — links, marks */
  --accent-dim: #244d2c;   /* hover */

  /* Type */
  --serif-display: "Fraunces", "Iowan Old Style", "Hoefler Text", Georgia, serif;
  --serif-body:    "Spectral", "Iowan Old Style", "Hoefler Text", Georgia, serif;
  --mono:          "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  /* Measure */
  --measure: 34rem;          /* main reading column */
  --measure-wide: 46rem;     /* slightly wider, for landing */
  --pad-x: clamp(1.25rem, 4vw, 2.5rem);
}

/* Reset-ish */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-body);
  font-size: 18px;
  line-height: 1.65;
  font-feature-settings: "kern", "liga", "onum";
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle paper texture from a layered radial — almost invisible, just kills flatness */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(53, 122, 68, 0.04), transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(26, 24, 21, 0.03), transparent 50%);
}

/* ---------- Layout shells ---------- */

.shell {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}
.shell-wide {
  max-width: var(--measure-wide);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

/* ---------- Site header (every page) ---------- */

.site-header {
  padding: 2.5rem 0 1.25rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 3.5rem;
}
.site-header .shell-wide {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.brand {
  font-family: var(--serif-display);
  font-weight: 500;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  font-variation-settings: "opsz" 36, "SOFT" 0;
}
.nav {
  display: flex;
  gap: 1.75rem;
  font-size: 0.95rem;
  font-family: var(--serif-body);
}
.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color 0.15s, border-color 0.15s;
}
.nav a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- Site footer ---------- */

.site-footer {
  margin-top: 6rem;
  padding: 2.5rem 0 3rem;
  border-top: 1px solid var(--rule);
  font-size: 0.875rem;
  color: var(--ink-faint);
  font-family: var(--serif-body);
}
.site-footer .shell-wide {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}
.site-footer a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}
.site-footer a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- Headings ---------- */

h1, h2, h3, h4 {
  font-family: var(--serif-display);
  color: var(--ink);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 0;
  font-variation-settings: "opsz" 36, "SOFT" 0;
}
h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  font-weight: 400;
  letter-spacing: -0.025em;
  margin-bottom: 0.5rem;
  font-variation-settings: "opsz" 144, "SOFT" 30;
}
h2 {
  font-size: 1.65rem;
  margin-top: 3rem;
  margin-bottom: 0.6rem;
  font-style: italic;
  font-weight: 400;
  font-variation-settings: "opsz" 72, "SOFT" 50;
  color: var(--ink);
}
h3 {
  font-size: 1.2rem;
  margin-top: 2rem;
  margin-bottom: 0.4rem;
}

/* ---------- Body text ---------- */

p {
  margin: 1.1em 0;
}
p + p { text-indent: 1.4em; margin-top: 0; }
h1 + p, h2 + p, h3 + p, .lead + p, blockquote + p, figure + p, hr + p { text-indent: 0; }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 122, 68, 0.35);
  transition: color 0.15s, border-color 0.15s;
}
a:hover {
  color: var(--accent-dim);
  border-bottom-color: var(--accent-dim);
}

strong { font-weight: 600; color: var(--ink); }
em { font-style: italic; }

/* Lead paragraph for opening lines */
.lead {
  font-size: 1.18rem;
  line-height: 1.55;
  color: var(--ink);
  margin: 1.5rem 0 1.5rem;
  font-style: normal;
  font-family: var(--serif-body);
  font-weight: 300;
}
.lead strong { font-style: normal; font-weight: 600; }

/* Drop cap on the first paragraph after a lead — restrained, just a touch */
.dropcap::first-letter {
  font-family: var(--serif-display);
  font-size: 3.4em;
  line-height: 0.85;
  float: left;
  padding: 0.15em 0.08em 0 0;
  font-weight: 400;
  color: var(--accent);
  font-variation-settings: "opsz" 144, "SOFT" 30;
}

/* Marginal asides — italic, indented, hairline */
.aside {
  font-style: italic;
  color: var(--ink-soft);
  font-size: 0.95rem;
  border-left: 2px solid var(--accent);
  padding: 0.1rem 0 0.1rem 1.1rem;
  margin: 1.75rem 0;
}

/* Block quotes */
blockquote {
  margin: 1.5rem 0;
  padding-left: 1.25rem;
  border-left: 2px solid var(--rule);
  color: var(--ink-soft);
  font-style: italic;
}

/* Lists */
ul, ol { padding-left: 1.4em; }
li { margin: 0.35em 0; }

/* Horizontal rules — restrained ornamental */
hr {
  border: none;
  text-align: center;
  margin: 3rem 0;
  height: 1rem;
  position: relative;
}
hr::before {
  content: "✻";
  color: var(--ink-faint);
  font-size: 1rem;
  letter-spacing: 0.5em;
  font-family: var(--serif-display);
}

/* Code & math */
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: rgba(53, 122, 68, 0.08);
  padding: 0.1em 0.35em;
  border-radius: 2px;
  color: var(--accent-dim);
}
pre {
  font-family: var(--mono);
  font-size: 0.88em;
  background: #f3efe2;
  border: 1px solid var(--rule-soft);
  border-radius: 3px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: none; padding: 0; color: var(--ink); }

.MathJax_Display, .katex-display {
  margin: 1.5rem 0 !important;
  overflow-x: auto;
  overflow-y: hidden;
}

/* Figures */
figure {
  margin: 2rem 0;
}
figure img {
  width: 100%;
  height: auto;
  border: 1px solid var(--rule-soft);
}
figcaption {
  font-size: 0.875rem;
  color: var(--ink-faint);
  margin-top: 0.6rem;
  font-style: italic;
  line-height: 1.5;
}

/* ---------- Page-specific: homepage hero ---------- */

.hero {
  padding: 1rem 0 2rem;
}
.hero .eyebrow {
  font-family: var(--serif-body);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
  font-weight: 500;
}
.hero h1 {
  font-size: clamp(2.4rem, 6.5vw, 4rem);
  line-height: 1.05;
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}
.hero h1 em {
  font-style: italic;
  color: var(--accent);
  font-variation-settings: "opsz" 144, "SOFT" 100;
}
.hero .lead {
  font-size: 1.3rem;
  margin: 1.5rem 0 2rem;
  max-width: 32rem;
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 2rem;
  font-size: 1rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
.hero-cta a {
  border-bottom: none;
  color: var(--ink);
  font-family: var(--serif-display);
  font-style: italic;
  font-size: 1.05rem;
}
.hero-cta a::after {
  content: " →";
  color: var(--accent);
  transition: transform 0.2s;
  display: inline-block;
}
.hero-cta a:hover { color: var(--accent); }
.hero-cta a:hover::after { transform: translateX(3px); }

/* ---------- Recent work block ---------- */

.recent {
  margin-top: 5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--rule);
}
.recent h2 {
  font-family: var(--serif-body);
  font-style: normal;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 1.5rem;
  font-weight: 500;
}
.recent-item {
  display: block;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule-soft);
  text-decoration: none;
  border-bottom-color: var(--rule-soft);
  color: var(--ink);
}
.recent-item:hover {
  color: var(--ink);
  border-bottom-color: var(--rule);
}
.recent-item h3 {
  font-family: var(--serif-display);
  font-size: 1.4rem;
  margin: 0 0 0.4rem;
  font-weight: 400;
  font-variation-settings: "opsz" 72, "SOFT" 30;
}
.recent-item:hover h3 { color: var(--accent); }
.recent-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  text-indent: 0;
}
.recent-item .date {
  font-size: 0.8rem;
  color: var(--ink-faint);
  font-style: italic;
  margin-top: 0.3rem;
  display: block;
}

/* ---------- Services page ---------- */

.service {
  margin: 2.5rem 0;
}
.service h2 {
  font-style: normal;
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  font-variation-settings: "opsz" 72, "SOFT" 30;
}
.service h2::before {
  content: "—";
  color: var(--accent);
  margin-right: 0.5rem;
  font-style: normal;
}

/* ---------- Blog post chrome ---------- */

.post-meta {
  font-family: var(--serif-body);
  font-style: italic;
  color: var(--ink-faint);
  font-size: 0.95rem;
  margin: 0 0 2rem;
}
.post-meta .author { color: var(--ink-soft); }

.post-cta {
  margin-top: 4rem;
  padding: 1.75rem 0 1.5rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 1rem;
}
.post-cta strong {
  font-style: normal;
  color: var(--ink);
}

/* ---------- References ---------- */

.references {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--ink-soft);
}
.references h2 {
  font-family: var(--serif-body);
  font-style: normal;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 1.5rem;
  font-weight: 500;
}
.references ol {
  list-style: none;
  padding-left: 0;
  counter-reset: ref;
}
.references li {
  counter-increment: ref;
  padding-left: 2.2em;
  position: relative;
  margin: 0.85em 0;
}
.references li::before {
  content: counter(ref);
  position: absolute;
  left: 0;
  font-family: var(--serif-display);
  font-style: italic;
  color: var(--accent);
  font-variation-settings: "opsz" 36;
  width: 1.8em;
  text-align: right;
}

/* ---------- Responsive ---------- */

@media (max-width: 600px) {
  body { font-size: 17px; }
  .site-header { padding-top: 1.75rem; margin-bottom: 2.5rem; }
  .nav { gap: 1.25rem; font-size: 0.9rem; }
  .hero h1 { font-size: 2.4rem; }
  h2 { font-size: 1.45rem; margin-top: 2.25rem; }
  .lead { font-size: 1.1rem; }
  .post-cta { font-size: 0.95rem; }
  .dropcap::first-letter { font-size: 3em; }
  hr { margin: 2rem 0; }
}

/* Print — make it look like a paper */
@media print {
  body::before { display: none; }
  .site-header, .site-footer, .post-cta { display: none; }
  body { font-size: 11pt; color: #000; background: #fff; }
  a { color: #000; border-bottom: none; }
  h1, h2, h3 { color: #000; }
}