:root {
  --ink: #101214;
  --graphite: #30363a;
  --muted: #6d7374;
  --paper: #f7f5ef;
  --sheet: #fffefa;
  --line: #cfc8b8;
  --blue: #1f6078;
  --crimson: #a83228;
  --brass: #b48a34;
  --mist: #dce7e8;
  --shadow: 0 22px 70px rgba(16, 18, 20, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(16, 18, 20, 0.045) 1px, transparent 1px),
    linear-gradient(rgba(16, 18, 20, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 44px 44px;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.site-header,
.site-footer,
main {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 16px 0;
  background: rgba(247, 245, 239, 0.92);
  border-bottom: 1px solid rgba(16, 18, 20, 0.14);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  color: var(--sheet);
  background: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 5px 5px 0 var(--brass);
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
}

.brand small,
.nav,
.issue-kicker,
.section-label,
.masthead-grid span,
.feature-meta,
.decision-strip strong,
.price-block span,
.manual-cta,
.site-footer {
  font-family: "Aptos", "Segoe UI", Verdana, sans-serif;
}

.brand small {
  color: var(--muted);
  font-size: 0.78rem;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  background: var(--sheet);
  border: 1px solid var(--line);
}

.nav a {
  min-height: 36px;
  padding: 9px 12px;
  color: var(--graphite);
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 800;
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--sheet);
  background: var(--blue);
  outline: none;
}

.hero {
  min-height: min(720px, calc(100vh - 76px));
  display: grid;
  align-content: center;
  padding: 56px 0 38px;
  border-bottom: 3px solid var(--ink);
}

.issue-kicker,
.section-label,
.masthead-grid span,
.feature-meta,
.decision-strip strong,
.price-block span {
  color: var(--crimson);
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 1050px;
  margin: 12px 0 20px;
  font-size: clamp(3.2rem, 11vw, 9.4rem);
  line-height: 0.86;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(2rem, 5vw, 4.6rem);
  line-height: 0.94;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 720px;
  color: var(--graphite);
  font-size: clamp(1.15rem, 2vw, 1.42rem);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--ink);
  text-decoration: none;
  font-family: "Aptos", "Segoe UI", Verdana, sans-serif;
  font-weight: 900;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 rgba(168, 50, 40, 0.28);
  outline: none;
}

.primary {
  color: var(--sheet);
  background: var(--ink);
  box-shadow: 5px 5px 0 var(--brass);
}

.secondary {
  color: var(--ink);
  background: var(--sheet);
}

.masthead-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 24px 0;
  background: var(--sheet);
  border: 1px solid var(--ink);
  box-shadow: var(--shadow);
}

.masthead-grid article {
  min-height: 190px;
  padding: 20px;
  border-right: 1px solid var(--line);
}

.masthead-grid article:last-child {
  border-right: 0;
}

.masthead-grid strong {
  display: block;
  margin: 12px 0;
  font-size: 1.45rem;
  line-height: 1.05;
}

.masthead-grid p,
.feature-card p,
.paid-copy p,
.article-body p,
.article-body li {
  color: var(--graphite);
  line-height: 1.62;
}

.latest,
.doctrine,
.paid-note {
  margin: 68px 0;
}

.feature-card {
  display: grid;
  gap: 18px;
  padding: 28px;
  background: var(--sheet);
  border: 1px solid var(--ink);
  box-shadow: 10px 10px 0 rgba(31, 96, 120, 0.22);
}

.archive-card {
  margin-top: 22px;
  box-shadow: 7px 7px 0 rgba(180, 138, 52, 0.28);
}

.archive-card h2 {
  font-size: clamp(1.6rem, 3.4vw, 3.1rem);
}

.feature-meta,
.decision-strip {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.feature-card h2 a {
  text-decoration-thickness: 2px;
  text-underline-offset: 8px;
}

.decision-strip {
  padding: 16px;
  background: var(--mist);
  border-left: 5px solid var(--blue);
}

.decision-strip span {
  max-width: 760px;
}

.doctrine {
  display: grid;
  grid-template-columns: 0.8fr 1fr;
  gap: 40px;
  align-items: start;
  padding: 42px 0;
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

.doctrine-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: doctrine;
}

.doctrine-list li {
  counter-increment: doctrine;
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px;
  background: var(--sheet);
  border: 1px solid var(--line);
}

.doctrine-list li::before {
  content: counter(doctrine);
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: var(--sheet);
  background: var(--crimson);
  font-family: "Aptos", "Segoe UI", Verdana, sans-serif;
  font-weight: 900;
}

.paid-note {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
}

.price-block,
.paid-copy {
  padding: 24px;
  background: var(--sheet);
  border: 1px solid var(--ink);
}

.price-block {
  box-shadow: 8px 8px 0 var(--brass);
}

.price-block strong {
  display: block;
  margin: 12px 0;
  font-size: 4rem;
  line-height: 0.9;
}

.paid-copy ul {
  margin: 0 0 18px;
  padding-left: 22px;
}

.manual-cta {
  margin: 0;
  padding: 14px;
  background: var(--paper);
  border: 1px solid var(--line);
  font-size: 0.92rem;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 28px 0 40px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

.article-main {
  display: grid;
  grid-template-columns: minmax(0, 740px) minmax(240px, 320px);
  gap: 54px;
  align-items: start;
  padding-top: 48px;
}

.article-header {
  grid-column: 1 / -1;
  padding-bottom: 24px;
  border-bottom: 3px solid var(--ink);
}

.article-header p {
  max-width: 760px;
  color: var(--graphite);
  font-size: 1.24rem;
  line-height: 1.52;
}

.article-body {
  font-size: 1.09rem;
}

.article-body h2 {
  margin-top: 46px;
  font-size: clamp(1.8rem, 4vw, 3rem);
}

.article-body blockquote {
  margin: 34px 0;
  padding: 18px 20px;
  color: var(--ink);
  background: var(--mist);
  border-left: 5px solid var(--blue);
  font-size: 1.28rem;
  line-height: 1.42;
}

.article-body h3 {
  margin: 30px 0 10px;
  font-size: 1.42rem;
  line-height: 1.18;
}

.article-table-wrap {
  max-width: 100%;
  margin: 34px 0;
  overflow-x: auto;
  border: 1px solid var(--ink);
  background: var(--sheet);
}

.article-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-family: "Aptos", "Segoe UI", Verdana, sans-serif;
  font-size: 0.95rem;
}

.article-table th,
.article-table td {
  padding: 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.article-table th {
  color: var(--sheet);
  background: var(--ink);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article-table tr:last-child td {
  border-bottom: 0;
}

/* Editorial diagrams for skimming theory / process sections */
.article-figure {
  margin: 28px 0 36px;
  padding: 18px 16px 14px;
  background: var(--sheet);
  border: 1px solid var(--ink);
  box-shadow: 6px 6px 0 rgba(31, 96, 120, 0.14);
}

.article-figure svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 720px;
  margin: 0 auto;
}

.article-figure figcaption {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: "Aptos", "Segoe UI", Verdana, sans-serif;
  font-size: 0.86rem;
  line-height: 1.45;
}

.worksheet-preview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 28px 0;
}

.worksheet-preview div {
  min-height: 150px;
  padding: 16px;
  background: var(--sheet);
  border: 1px solid var(--ink);
  box-shadow: 5px 5px 0 rgba(168, 50, 40, 0.18);
}

.worksheet-preview strong {
  display: block;
  margin-top: 12px;
  line-height: 1.28;
}

.source-notes {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 3px solid var(--ink);
}

.source-notes h2 {
  font-size: clamp(1.7rem, 3.5vw, 2.6rem);
}

.source-notes ul {
  padding-left: 22px;
}

.source-notes a {
  color: var(--blue);
  font-weight: 800;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.article-side {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 16px;
}

.side-card {
  padding: 18px;
  background: var(--sheet);
  border: 1px solid var(--ink);
}

.side-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.2rem;
}

.side-card p {
  margin-bottom: 0;
  color: var(--graphite);
  line-height: 1.48;
}

@media (max-width: 820px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    width: 100%;
  }

  .hero {
    min-height: auto;
    padding-top: 42px;
  }

  .masthead-grid,
  .doctrine,
  .paid-note,
  .article-main,
  .worksheet-preview {
    grid-template-columns: 1fr;
  }

  .masthead-grid article {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .masthead-grid article:last-child {
    border-bottom: 0;
  }

  .article-side {
    position: static;
  }

  .article-main {
    display: block;
  }

  .article-header,
  .article-body {
    max-width: 100%;
    min-width: 0;
  }
}

@media (max-width: 520px) {
  .site-header,
  .site-footer,
  main {
    width: min(100% - 20px, 1180px);
  }

  h1 {
    font-size: clamp(2.7rem, 17vw, 4.2rem);
  }

  .article-header h1 {
    font-size: clamp(2.3rem, 11.5vw, 3.2rem);
    line-height: 0.98;
    overflow-wrap: anywhere;
  }

  .article-header p,
  .article-body p,
  .article-body li {
    overflow-wrap: break-word;
  }

  .feature-card,
  .price-block,
  .paid-copy {
    padding: 18px;
  }
}