:root {
  --ink: #2a2825;
  --ink-strong: #090909;
  --muted: #625f5d;
  --canvas: #f3ead8;
  --surface: #fbf8f1;
  --surface-raised: #ffffff;
  --line: rgba(9, 9, 9, 0.14);
  --accent: #0004ff;
  --accent-ink: #ffffff;
  --success: #173f2a;
  --max-width: 72rem;
  --reading-width: 46rem;
  --font-sans: "Satoshi", Arial, Helvetica, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 88% 4%, rgba(0, 4, 255, 0.06), transparent 24rem),
    var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 20;
  padding: 0.65rem 0.9rem;
  border-radius: 0.45rem;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.editorial-header {
  border-bottom: 1px solid var(--line);
  background: rgba(243, 234, 216, 0.9);
  backdrop-filter: blur(12px);
}

.editorial-header__inner {
  width: min(calc(100% - 2rem), var(--max-width));
  min-height: 4.5rem;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.editorial-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.editorial-brand img {
  display: block;
  width: 153px;
  height: 30px;
}

.editorial-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.8rem, 2.5vw, 1.5rem);
  font-size: 0.9rem;
  font-weight: 700;
}

.editorial-nav a {
  color: var(--muted);
  text-decoration: none;
}

.editorial-nav a:hover,
.editorial-nav a[aria-current="page"] {
  color: var(--ink-strong);
}

.editorial-nav a:focus-visible,
.editorial-brand:focus-visible,
.card:focus-visible,
.text-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.blog-main,
.article-main {
  width: min(calc(100% - 2rem), var(--max-width));
  margin-inline: auto;
}

.blog-hero {
  padding: clamp(4rem, 9vw, 8rem) 0 clamp(3rem, 7vw, 6rem);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.blog-hero h1,
.article-header h1 {
  max-width: 15ch;
  margin: 0;
  color: var(--ink-strong);
  font-size: clamp(2.75rem, 7vw, 6.25rem);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 0.98;
  text-wrap: balance;
}

.blog-hero__lede {
  max-width: 41rem;
  margin: 1.75rem 0 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.55;
}

.principles {
  margin: 2rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  list-style: none;
}

.principles li {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.blog-section {
  padding: clamp(3rem, 6vw, 5.5rem) 0;
}

.section-heading {
  margin-bottom: 1.75rem;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
}

.section-heading h2 {
  margin: 0;
  color: var(--ink-strong);
  font-size: clamp(1.65rem, 3vw, 2.4rem);
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.section-heading p {
  max-width: 32rem;
  margin: 0;
  color: var(--muted);
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  grid-column: span 3;
  min-height: 20rem;
  padding: clamp(1.4rem, 3vw, 2rem);
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: linear-gradient(155deg, var(--surface-raised), var(--surface));
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

.card:hover {
  border-color: rgba(0, 4, 255, 0.5);
  transform: translateY(-3px);
}

.card--featured {
  grid-column: span 6;
  background:
    linear-gradient(135deg, rgba(0, 4, 255, 0.08), transparent 45%),
    var(--surface);
}

.card__meta {
  margin: 0 0 auto;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card h3 {
  max-width: 18ch;
  margin: 2.5rem 0 0.85rem;
  color: var(--ink-strong);
  font-size: clamp(1.45rem, 2.8vw, 2.25rem);
  letter-spacing: -0.035em;
  line-height: 1.08;
  text-wrap: balance;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.card__arrow {
  margin-top: 1.5rem;
  color: var(--ink-strong);
  font-weight: 700;
}

.topic-map {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--line);
  overflow: hidden;
}

.topic-map__item {
  min-height: 9rem;
  padding: 1.25rem;
  background: var(--surface);
}

.topic-map__item strong {
  display: block;
  color: var(--ink-strong);
}

.topic-map__item span {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.article-main {
  padding-bottom: 5rem;
}

.breadcrumbs {
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.breadcrumbs ol {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  margin-left: 0.4rem;
  color: #8a8580;
  content: "/";
}

.breadcrumbs a:hover {
  color: var(--ink-strong);
}

.article-header {
  max-width: 58rem;
  padding: clamp(3.5rem, 8vw, 7rem) 0 clamp(2.5rem, 5vw, 4rem);
}

.article-header h1 {
  max-width: 13ch;
  font-size: clamp(2.65rem, 6.5vw, 5.5rem);
}

.article-dek {
  max-width: 42rem;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2vw, 1.3rem);
}

.article-byline {
  margin: 1.5rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.article-byline strong {
  color: var(--ink);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 20rem);
  gap: clamp(2.5rem, 7vw, 7rem);
  align-items: start;
}

.article-body {
  max-width: var(--reading-width);
  min-width: 0;
}

.article-body h2 {
  margin: 3.5rem 0 1rem;
  scroll-margin-top: 2rem;
  color: var(--ink-strong);
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.article-body h3 {
  margin: 2.25rem 0 0.75rem;
  color: var(--ink-strong);
  font-size: 1.2rem;
  line-height: 1.3;
}

.article-body p,
.article-body ul,
.article-body ol {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.article-body li + li {
  margin-top: 0.55rem;
}

.article-body a,
.text-link {
  color: var(--accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.15em;
}

.answer-box {
  margin: 0 0 2.5rem;
  padding: clamp(1.35rem, 3vw, 2rem);
  border: 1px solid rgba(0, 4, 255, 0.28);
  border-radius: 0.9rem;
  background: rgba(0, 4, 255, 0.05);
}

.answer-box__label {
  margin: 0 0 0.55rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.answer-box p:last-child {
  margin-bottom: 0;
}

.evidence-note {
  margin: 2rem 0;
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  color: var(--muted);
}

.evidence-note strong {
  color: var(--ink-strong);
}

.data-table-wrap {
  margin: 1.5rem 0 2rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
}

.data-table {
  width: 100%;
  min-width: 36rem;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.data-table th,
.data-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: var(--surface-raised);
  color: var(--ink-strong);
}

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

.formula {
  margin: 1.5rem 0;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  overflow-x: auto;
}

.calculator {
  margin: 2rem 0 2.5rem;
  padding: clamp(1.35rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: var(--surface);
}

.calculator h3 {
  margin-top: 0;
  font-size: 1.35rem;
}

.calculator__fields {
  margin: 1.25rem 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}

.calculator label {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.calculator input {
  width: 100%;
  margin-top: 0.4rem;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: #fff;
  color: var(--ink-strong);
  font: inherit;
}

.calculator input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.calculator button {
  padding: 0.75rem 1rem;
  border: 0;
  border-radius: 0.5rem;
  background: var(--accent);
  color: var(--accent-ink);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.calculator button:hover {
  filter: brightness(1.05);
}

.calculator button:focus-visible {
  outline: 2px solid var(--ink-strong);
  outline-offset: 3px;
}

.calculator__result {
  min-height: 2.2rem;
  margin: 1.25rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--success);
  font-weight: 700;
}

.checklist {
  padding-left: 0;
  list-style: none;
  counter-reset: checklist;
}

.checklist li {
  position: relative;
  min-height: 2rem;
  padding-left: 2.65rem;
  counter-increment: checklist;
}

.checklist li::before {
  position: absolute;
  top: -0.05rem;
  left: 0;
  width: 1.8rem;
  height: 1.8rem;
  display: grid;
  place-items: center;
  border: 1px solid rgba(0, 4, 255, 0.35);
  border-radius: 50%;
  color: var(--accent);
  content: counter(checklist);
  font-size: 0.75rem;
  font-weight: 700;
}

.article-aside {
  position: sticky;
  top: 1.5rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  background: rgba(255, 255, 255, 0.72);
}

.article-aside h2 {
  margin: 0 0 0.8rem;
  color: var(--ink-strong);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article-aside ol {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.86rem;
}

.article-aside li + li {
  margin-top: 0.5rem;
}

.article-aside a {
  text-decoration: none;
}

.article-aside a:hover {
  color: var(--ink-strong);
}

.sources {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.sources h2 {
  margin-top: 0;
}

.sources li {
  color: var(--muted);
  font-size: 0.9rem;
}

.next-read {
  margin-top: 3.5rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  background: var(--surface);
}

.next-read p {
  margin-bottom: 0.35rem;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.next-read a {
  color: var(--ink-strong);
  font-size: 1.15rem;
  font-weight: 700;
}

.editorial-footer {
  border-top: 1px solid var(--line);
}

.editorial-footer__inner {
  width: min(calc(100% - 2rem), var(--max-width));
  margin-inline: auto;
  padding: 2rem 0;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.editorial-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.editorial-footer a:hover {
  color: var(--ink-strong);
}

@media (max-width: 52rem) {
  .card,
  .card--featured {
    grid-column: span 6;
  }

  .topic-map {
    grid-template-columns: 1fr 1fr;
  }

  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-aside {
    position: static;
    grid-row: 1;
  }
}

@media (max-width: 38rem) {
  .editorial-header__inner {
    min-height: 4rem;
  }

  .editorial-nav a:first-child {
    display: none;
  }

  .editorial-nav {
    gap: 0.85rem;
    font-size: 0.82rem;
  }

  .section-heading,
  .editorial-footer__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .card,
  .card--featured {
    grid-column: 1 / -1;
    min-height: 17rem;
  }

  .topic-map {
    grid-template-columns: 1fr;
    padding: 0;
  }

  .calculator__fields {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .card {
    transition: none;
  }
}