:root {
  --bg: #f3ecde;
  --bg-strong: #fffaf1;
  --surface: rgba(255, 250, 241, 0.86);
  --surface-strong: #fffaf1;
  --ink: #17202b;
  --ink-soft: #52606f;
  --line: rgba(23, 32, 43, 0.12);
  --accent: #d45e39;
  --accent-deep: #a33d1e;
  --signal: #0d6e6e;
  --signal-soft: rgba(13, 110, 110, 0.12);
  --sun: #ffd169;
  --shadow: 0 24px 60px rgba(23, 32, 43, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --content-width: 1180px;
  --font-display: "Fraunces", "Times New Roman", serif;
  --font-sans: "Space Grotesk", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(255, 209, 105, 0.45), transparent 32%),
    radial-gradient(circle at top right, rgba(13, 110, 110, 0.18), transparent 24%),
    linear-gradient(180deg, #f7f1e7 0%, #f1e8d7 42%, #efe7da 100%);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.6;
}

img {
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

main {
  display: block;
}

.page-shell {
  width: min(calc(100% - 32px), var(--content-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(243, 236, 222, 0.76);
  border-bottom: 1px solid rgba(23, 32, 43, 0.08);
}

.site-header__inner,
.site-footer__inner {
  width: min(calc(100% - 32px), var(--content-width));
  margin: 0 auto;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand__mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: #0f1726;
  color: var(--sun);
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.brand__eyebrow,
.eyebrow {
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.brand__title {
  display: block;
  font-weight: 700;
  font-size: 1rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--ink-soft);
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 700;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button--solid {
  background: var(--ink);
  color: #fffdf7;
}

.button--solid:hover,
.button--solid:focus-visible {
  background: #0f1726;
}

.button--ghost {
  background: rgba(255, 255, 255, 0.48);
  border-color: rgba(23, 32, 43, 0.12);
}

.button--ghost:hover,
.button--ghost:focus-visible {
  border-color: rgba(23, 32, 43, 0.24);
}

.hero {
  padding: 72px 0 56px;
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 28px;
  align-items: stretch;
}

.hero__copy,
.hero__panel,
.section-card,
.link-card,
.article-card,
.project-card,
.article-layout,
.calculator,
.callout,
.footer-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.hero__copy {
  padding: 36px;
}

.hero__title,
.section-title,
.article-title {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.02;
}

.hero__title {
  font-size: clamp(3rem, 6vw, 6.2rem);
  max-width: 11ch;
}

.hero__lede,
.section-intro,
.article-intro {
  color: var(--ink-soft);
  font-size: 1.05rem;
  max-width: 58ch;
}

.hero__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.hero__chips,
.inline-tags,
.article-meta,
.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip,
.tag,
.meta-pill,
.toc a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(23, 32, 43, 0.08);
  color: var(--ink-soft);
}

.hero__chips {
  margin-top: 30px;
}

.hero__panel {
  padding: 28px;
  display: grid;
  gap: 18px;
}

.panel-block {
  display: grid;
  gap: 12px;
  padding: 18px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.66));
  border: 1px solid rgba(23, 32, 43, 0.08);
}

.panel-block h3,
.section-card h3,
.link-card h3,
.article-card h3,
.project-card h3,
.callout h3 {
  margin: 0 0 10px;
  font-size: 1.15rem;
}

.panel-block p,
.section-card p,
.link-card p,
.article-card p,
.project-card p,
.callout p,
.site-footer p {
  margin: 0;
  color: var(--ink-soft);
}

.panel-block .button {
  justify-self: start;
  min-height: 42px;
  padding: 0 16px;
}

.section {
  padding: 34px 0 24px;
}

.section__header {
  margin-bottom: 24px;
}

.section-title {
  font-size: clamp(2.2rem, 4vw, 3.6rem);
}

.section-grid,
.link-grid,
.projects-grid,
.article-grid,
.definition-grid {
  display: grid;
  gap: 22px;
}

.section-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.link-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.projects-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.article-grid {
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  align-items: start;
}

.definition-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.section-card,
.link-card,
.article-card,
.project-card,
.callout,
.calculator {
  padding: 24px;
}

.section-card strong,
.link-card strong,
.article-card strong,
.project-card strong,
.metric strong {
  display: block;
  margin-top: 14px;
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.section-card .button {
  margin-top: 18px;
}

.metric-list {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.metric {
  display: grid;
  gap: 6px;
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(13, 110, 110, 0.08);
  color: var(--ink);
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.metric:hover,
.metric:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(13, 110, 110, 0.18);
  background: rgba(13, 110, 110, 0.12);
}

.metric:focus-visible {
  outline: 2px solid rgba(13, 110, 110, 0.32);
  outline-offset: 2px;
}

.article-preview {
  display: grid;
  gap: 18px;
}

.formula {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(13, 110, 110, 0.12), rgba(255, 209, 105, 0.2));
  border: 1px solid rgba(23, 32, 43, 0.08);
  font-family: var(--font-display);
  font-size: 1.4rem;
}

.site-footer {
  padding: 44px 0 56px;
}

.footer-panel {
  padding: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--ink-soft);
}

.page-hero {
  padding: 56px 0 24px;
}

.article-layout {
  padding: 36px;
}

.article-layout h2 {
  margin: 36px 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.article-layout h3 {
  margin: 26px 0 10px;
  font-size: 1.15rem;
}

.article-layout p,
.article-layout li {
  color: var(--ink-soft);
}

.article-layout ul {
  padding-left: 20px;
}

.article-layout ol {
  padding-left: 22px;
}

.article-layout .pull-quote {
  margin: 28px 0;
  padding: 22px 24px;
  border-left: 4px solid var(--accent);
  background: rgba(212, 94, 57, 0.08);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
}

.calculator {
  position: sticky;
  top: 96px;
}

.calculator label,
.calculator span {
  display: block;
  margin-bottom: 10px;
  font-weight: 700;
}

.calculator input {
  width: 100%;
  min-height: 52px;
  padding: 0 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(23, 32, 43, 0.14);
  background: rgba(255, 255, 255, 0.8);
  color: var(--ink);
  font: inherit;
}

.calculator__result {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.calculator__value {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(13, 110, 110, 0.08);
}

.calculator__value strong {
  display: block;
  margin-bottom: 6px;
  font-size: 0.84rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
}

.callout {
  margin-top: 22px;
}

.link-card,
.definition-card,
.timeline__item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.link-card {
  display: grid;
  gap: 16px;
  align-content: start;
}

.definition-card {
  padding: 20px;
}

.definition-card dt {
  margin: 0 0 8px;
  font-weight: 700;
  color: var(--ink);
}

.definition-card dd {
  margin: 0;
  color: var(--ink-soft);
}

.timeline {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.timeline__item {
  padding: 22px 22px 22px 28px;
  position: relative;
  overflow: hidden;
}

.timeline__item::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 6px;
  background: linear-gradient(180deg, var(--accent), var(--sun));
}

.timeline__item strong {
  display: inline-block;
  margin-bottom: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.mini-table {
  width: 100%;
  margin-top: 18px;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.7);
}

.mini-table th,
.mini-table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(23, 32, 43, 0.08);
  text-align: left;
}

.mini-table th {
  color: var(--ink);
  font-size: 0.84rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.notice-strip {
  margin-top: 24px;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  background: rgba(212, 94, 57, 0.08);
  border: 1px solid rgba(212, 94, 57, 0.16);
  color: var(--ink-soft);
}

.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 560ms ease, transform 560ms ease;
}

.js-ready [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1040px) {
  .hero__grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .section-grid,
  .link-grid,
  .definition-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .calculator {
    position: static;
  }
}

@media (max-width: 720px) {
  .site-header__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding-top: 48px;
  }

  .hero__copy,
  .hero__panel,
  .section-card,
  .article-card,
  .project-card,
  .article-layout,
  .calculator,
  .callout,
  .footer-panel {
    padding: 22px;
  }

  .section-grid,
  .link-grid,
  .definition-grid {
    grid-template-columns: 1fr;
  }

  .hero__title {
    max-width: none;
  }
}