:root {
  /* Paper-feel palette: cream + ink + terracotta */
  --paper:        #f3ecdb;
  --paper-deep:   #ebe2c9;
  --paper-edge:   #d8cdaf;
  --ink:          #15130f;
  --ink-soft:     #5a5347;
  --ink-faint:    #948a76;
  --accent:       #b34226;     /* terracotta */
  --accent-deep:  #842a14;
  --accent-soft:  #e7c8b8;
  --mustard:      #c89236;
  --rule:         #c8bda1;
  --rule-soft:    #ddd2b6;

  /* Type scale */
  --serif:  "Fraunces", "Iowan Old Style", Cambria, "Times New Roman", serif;
  --sans:   "IBM Plex Sans", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --mono:   "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --max-w: 1180px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

html {
  background: var(--paper);
  color: var(--ink);
}

body {
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.55;
  background:
    radial-gradient(circle at 0.5px 0.5px, rgba(21, 19, 15, 0.05) 0.7px, transparent 0) 0 0 / 22px 22px,
    linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }
a:hover { color: var(--accent); }

::selection { background: var(--accent); color: var(--paper); }

/* Page envelope — feels like a printed page with edge */
.paper {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ============================================================
   Masthead — small editorial header bar
   ============================================================ */
.masthead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0 1.25rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.masthead-meta { display: flex; align-items: center; gap: 0.65rem; }
.masthead-meta .dot {
  width: 6px; height: 6px; background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.masthead-domain {
  display: inline-flex; gap: 0.4rem; align-items: baseline;
}
.masthead-domain-pre {
  color: var(--accent);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding: clamp(3rem, 8vw, 6rem) 0 clamp(2.5rem, 6vw, 4rem);
  position: relative;
}
.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 1.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}
.hero-eyebrow::before {
  content: "";
  display: inline-block;
  width: 36px; height: 1px;
  background: var(--ink-soft);
}

.hero-title {
  font-family: var(--serif);
  font-variation-settings: "opsz" 144;
  font-weight: 500;
  font-size: clamp(3.4rem, 9.5vw, 8.2rem);
  line-height: 0.92;
  letter-spacing: -0.035em;
  margin: 0 0 1.5rem;
  color: var(--ink);
}
.hero-amp {
  display: inline-block;
  color: var(--accent);
  font-style: italic;
  font-weight: 400;
  margin: 0 0.05em;
  font-variation-settings: "opsz" 144;
}
.hero-amp em { font-style: italic; }

.hero-lead {
  font-size: clamp(1.05rem, 1.55vw, 1.2rem);
  line-height: 1.55;
  max-width: 38ch;
  color: var(--ink-soft);
  margin: 0 0 2rem;
}

.hero-stats {
  display: flex;
  gap: clamp(1.5rem, 4vw, 2.8rem);
  margin-bottom: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
.stat { display: flex; flex-direction: column; gap: 0.15rem; }
.stat-num {
  font-family: var(--serif);
  font-variation-settings: "opsz" 144;
  font-weight: 600;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  line-height: 1;
  color: var(--ink);
  font-feature-settings: "lnum";
}
.stat-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 999px;
  transition: background 0.16s, transform 0.16s;
}
.hero-cta:hover { background: var(--accent); color: var(--paper); transform: translateY(-2px); }
.hero-cta span { transition: transform 0.16s; }
.hero-cta:hover span { transform: translateX(4px); }

/* Hero SVG art */
.hero-art { position: relative; }
.hero-svg { width: 100%; height: auto; max-height: 460px; display: block; }
.hero-svg .art-paren {
  font-family: var(--serif);
  font-style: italic;
  font-size: 220px;
  font-weight: 400;
  fill: var(--accent);
  font-variation-settings: "opsz" 144;
}
.hero-svg .art-op {
  font-family: var(--serif);
  font-size: 110px;
  font-weight: 400;
  fill: var(--ink);
}
.hero-svg .art-op-mult { font-size: 90px; fill: var(--accent-deep); }
.hero-svg .art-num,
.hero-svg .art-den,
.hero-svg .art-int {
  font-family: var(--serif);
  font-style: italic;
  font-size: 96px;
  font-weight: 500;
  fill: var(--ink);
}
.hero-svg .art-int { font-size: 110px; font-style: normal; }
.hero-svg .art-bar { fill: var(--ink); }
.hero-svg .art-result { opacity: 0.55; }
.hero-svg .art-eq {
  font-family: var(--serif);
  font-style: italic;
  font-size: 72px;
  fill: var(--ink-soft);
}
.hero-svg .art-int-soft { fill: var(--accent); font-size: 84px; }

.hero-rule {
  margin-top: clamp(3rem, 6vw, 5rem);
  height: 1px;
  background: var(--rule);
  position: relative;
}
.hero-rule::after {
  content: "§";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: var(--paper);
  padding: 0 1rem;
  font-family: var(--serif);
  font-style: italic;
  color: var(--accent);
  font-size: 1.3rem;
}

/* ============================================================
   Section header (§ N · Title)
   ============================================================ */
.section-header {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  margin: 0 0 2.5rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1.2rem;
}
.section-num {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--accent);
  border-radius: 4px;
}
.section-title {
  font-family: var(--serif);
  font-variation-settings: "opsz" 60;
  font-weight: 500;
  font-style: italic;
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--ink);
}

section { padding: clamp(3.5rem, 7vw, 5.5rem) 0; }
section + section { border-top: 1px solid var(--rule); }
.hero + .why { border-top: none; }

.section-lead {
  font-size: 1.06rem;
  line-height: 1.65;
  max-width: 68ch;
  color: var(--ink-soft);
  margin: -1rem 0 2.5rem;
}
.section-lead strong { color: var(--ink); font-weight: 500; }
.section-lead em { font-family: var(--serif); font-style: italic; color: var(--accent); font-weight: 500; }

/* ============================================================
   "Why" cards — numbered index cards
   ============================================================ */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0;
  border-left: 1px solid var(--rule);
  border-top: 1px solid var(--rule);
}
.why-card {
  position: relative;
  padding: 2rem 1.6rem 1.8rem;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  transition: background 0.18s;
}
.why-card:hover { background: rgba(179, 66, 38, 0.04); }
.why-num {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 1.2rem;
  display: block;
}
.why-title {
  font-family: var(--serif);
  font-variation-settings: "opsz" 60;
  font-style: italic;
  font-weight: 500;
  font-size: 1.25rem;
  line-height: 1.2;
  margin: 0 0 0.7rem;
  letter-spacing: -0.015em;
}
.why-body {
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--ink-soft);
  margin: 0;
}

/* ============================================================
   PDF cards
   ============================================================ */
.pdf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}
.pdf-card {
  display: grid;
  grid-template-columns: 88px 1fr;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 4px;
  text-decoration: none;
  color: var(--ink);
  overflow: hidden;
  transition: transform 0.18s, border-color 0.18s, box-shadow 0.18s;
  position: relative;
}
.pdf-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 60%, rgba(179, 66, 38, 0.04) 100%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.18s;
}
.pdf-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 6px 20px rgba(21, 19, 15, 0.08);
  color: var(--ink);
}
.pdf-card:hover::before { opacity: 1; }
.pdf-card-num {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--serif);
  font-variation-settings: "opsz" 144;
  font-style: italic;
  font-weight: 500;
  font-size: 2.6rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: -0.02em;
  position: relative;
}
.pdf-card-num::after {
  content: "";
  position: absolute;
  top: 1rem;
  bottom: 1rem;
  right: 0;
  width: 1px;
  background: var(--ink-faint);
  opacity: 0.4;
}
.pdf-card:hover .pdf-card-num { background: var(--accent); }

.pdf-card-meta { padding: 1.1rem 1.2rem 1.1rem 1.4rem; }
.pdf-card-eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
}
.pdf-card-title {
  font-family: var(--serif);
  font-variation-settings: "opsz" 60;
  font-weight: 500;
  font-size: 1.15rem;
  line-height: 1.2;
  margin: 0 0 0.55rem;
  letter-spacing: -0.015em;
}
.pdf-card-sub { font-style: italic; color: var(--ink-soft); font-weight: 400; }
.pdf-card-desc {
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--ink-soft);
  margin: 0 0 0.85rem;
}
.pdf-card-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}
.pdf-card-arrow {
  margin-left: auto;
  background: var(--paper-edge);
  width: 26px; height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.95rem;
  color: var(--ink);
  transition: background 0.18s, transform 0.18s;
}
.pdf-card:hover .pdf-card-arrow {
  background: var(--accent);
  color: var(--paper);
  transform: translateY(2px);
}

/* ============================================================
   Docs section — editorial article
   ============================================================ */
.docs-body { font-size: 1rem; line-height: 1.7; color: var(--ink); }
.docs-body > * + * { margin-top: 1.1rem; }
.docs-body h2 {
  font-family: var(--serif);
  font-variation-settings: "opsz" 60;
  font-weight: 600;
  font-style: italic;
  font-size: 1.5rem;
  margin: 3rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  letter-spacing: -0.015em;
  color: var(--ink);
}
.docs-body h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.docs-body h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.12rem;
  margin: 2rem 0 0.5rem;
  letter-spacing: -0.01em;
}
.docs-body p {
  font-size: 1rem;
  max-width: 70ch;
  color: var(--ink);
}
.docs-body p strong { font-weight: 500; }
.docs-body em { font-family: var(--serif); font-style: italic; }
.docs-body code, .docs-body .docs-body pre {
  font-family: var(--mono);
  font-size: 0.88em;
  background: rgba(21, 19, 15, 0.06);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
}
.docs-body hr { display: none; }

/* Tables — printed-journal feel */
.docs-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 2rem;
  font-size: 0.93rem;
  background: var(--paper);
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}
.docs-body thead { border-bottom: 1px solid var(--ink); }
.docs-body th {
  text-align: left;
  padding: 0.75rem 0.85rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  white-space: nowrap;
  vertical-align: bottom;
  background: var(--paper-deep);
}
.docs-body td {
  text-align: left;
  padding: 0.75rem 0.85rem;
  vertical-align: top;
  border-bottom: 1px solid var(--rule-soft);
  color: var(--ink);
}
.docs-body tbody tr:hover { background: rgba(179, 66, 38, 0.04); }
.docs-body td strong { font-family: var(--serif); font-weight: 600; font-style: italic; color: var(--accent); }
.docs-body td code {
  background: transparent;
  border: 1px solid var(--rule);
  padding: 0.1rem 0.4rem;
  font-size: 0.85em;
}

.docs-body ul, .docs-body ol { padding-left: 1.4rem; max-width: 70ch; }
.docs-body li + li { margin-top: 0.3rem; }

/* ============================================================
   Footer
   ============================================================ */
.colophon {
  margin-top: 3rem;
  padding: 3rem 0 1.5rem;
  border-top: 2px solid var(--ink);
}
.colophon-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem 2rem;
  margin-bottom: 2.5rem;
}
.colophon-block { display: flex; flex-direction: column; gap: 0.35rem; }
.colophon-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.colophon-block a {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
}
.colophon-block a:hover { text-decoration: underline; }
.colophon-bar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}
.colophon-amp { color: var(--accent); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 880px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .hero-art { max-width: 340px; margin-inline: auto; }
  .hero-svg { max-height: 360px; }
  .hero-stats { flex-wrap: wrap; }
  .section-header { gap: 0.8rem; }
  .colophon-bar { flex-direction: column; gap: 0.4rem; }
}

@media (max-width: 520px) {
  .masthead { font-size: 0.65rem; }
  .pdf-card { grid-template-columns: 72px 1fr; }
  .pdf-card-num { font-size: 2rem; }
  .hero-title { font-size: clamp(3rem, 14vw, 4.5rem); }
}

/* ============================================================
   Page-load entrance
   ============================================================ */
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-eyebrow, .hero-title, .hero-lead, .hero-stats, .hero-cta, .hero-art {
  animation: rise 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}
.hero-eyebrow { animation-delay: 0.05s; }
.hero-title   { animation-delay: 0.15s; }
.hero-lead    { animation-delay: 0.30s; }
.hero-stats   { animation-delay: 0.42s; }
.hero-cta     { animation-delay: 0.52s; }
.hero-art     { animation-delay: 0.20s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}