:root {
  --paper: #fbfaf8;
  --paper-soft: #f4f2ec;
  --paper-deep: #edeae3;
  --ink: #1b1b1d;
  --ink-soft: #3d3d40;
  --muted: #79756e;
  --line: #e3e0d8;
  --accent: #a8462e;
  --accent-soft: #f2e4dd;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, "Cascadia Mono", Menlo, Consolas, monospace;
  --max: 44rem;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

/* ---------- site header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 250, 248, 0.88);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: 62rem;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.wordmark {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

.wordmark::before {
  content: "";
  display: inline-block;
  width: 0.55em;
  height: 0.55em;
  margin-right: 0.5em;
  background: var(--accent);
  vertical-align: baseline;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* ---------- hero ---------- */

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4.5rem 1.5rem 2.75rem;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--line) 1px, transparent 1px);
  background-size: 26px 26px;
  opacity: 0.35;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, #000, transparent 85%);
  mask-image: linear-gradient(to bottom, #000, transparent 85%);
}

.hero > * { position: relative; }

.hero h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.1rem, 5.4vw, 3.15rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0 0 1.4rem;
}

.lede {
  font-size: 1.08rem;
  line-height: 1.65;
  color: var(--ink-soft);
  max-width: 38rem;
  margin: 0 0 1.6rem;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.6rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 0 0 2.75rem;
}

/* layer motif (decorative) */

.layer-motif {
  margin: 0 0 2.75rem;
  max-width: 34rem;
}

.layer-motif line {
  stroke-width: 1.5;
  stroke: #cfcac0;
}

.layer-motif line.anchor {
  stroke: var(--accent);
  stroke-width: 3;
}

/* ---------- stats ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 0 0 1px;
}

.stat {
  background: var(--paper);
  padding: 1.1rem 1.2rem 1.15rem;
}

.stat .num {
  display: block;
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: 0.25rem;
}

.stat .label {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- article ---------- */

.article {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.5rem 1.5rem 5rem;
}

.section {
  padding-top: 3.75rem;
  border-top: 1px solid var(--line);
}

.section:first-of-type {
  border-top: 1px solid var(--line);
}

.article h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.55rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 1.4rem;
}

.article h3 {
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 2.6rem 0 0.9rem;
}

.article p {
  margin: 0 0 1.25rem;
}

.article strong { font-weight: 600; }

.article em { font-style: italic; }

.article a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  transition: border-color 0.15s ease;
}

.article a:hover { border-bottom-color: var(--accent); }

/* architecture figure */

.figure {
  margin: 0 0 1.75rem;
}

.figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background: #fff;
}

/* data mixture table */

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 1.75rem;
  font-size: 0.92rem;
}

.data-table th {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: left;
  padding: 0.55rem 0.75rem;
  border-bottom: 1.5px solid var(--ink);
}

.data-table td {
  padding: 0.7rem 0.75rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  color: var(--ink-soft);
}

.data-table tr:last-child td { border-bottom: none; }

.data-table td:first-child {
  font-weight: 600;
  color: var(--ink);
}

/* closing note */

.closing {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-style: italic;
  line-height: 1.6;
  color: var(--ink-soft);
  text-align: center;
  max-width: 30rem;
  margin: 4.5rem auto 0;
}

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

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-soft);
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 3rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--muted);
}

.footer-inner a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.footer-inner a:hover { color: var(--accent); border-bottom-color: var(--accent); }

.footer-mark {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.footer-mark .wordmark { font-size: 1rem; }

.footer-mark span {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  body { font-size: 16px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .hero { padding-top: 3rem; }
  .data-table { font-size: 0.84rem; }
  .data-table td, .data-table th { padding: 0.55rem 0.5rem; }
}