* {
  box-sizing: border-box;
}

:root {
  --background: #f4f2ec;
  --surface: #ffffff;
  --text: #1b1a17;
  --muted: #6b665c;
  --border: #ddd6c9;
  --primary: #b6470c;
  --primary-dark: #8f380a;
  --accent: #fbe9dc;
  --ink: #16181c;
  --ink-line: #2b2f36;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --serif: ui-serif, Georgia, "Iowan Old Style", "Times New Roman", serif;
  --sans: Inter, Arial, Helvetica, sans-serif;
  --max-width: 1120px;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--background);
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.container {
  width: min(92%, var(--max-width));
  margin: 0 auto;
}

.site-header {
  background: rgba(244, 242, 236, 0.94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-wrap {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  color: var(--text);
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo::before {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--primary);
  display: inline-block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
}

.nav-links a {
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--primary);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 1.2rem;
  line-height: 1;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
}

.hero {
  padding: 86px 0 64px;
  background-color: var(--accent);
  background-image:
    linear-gradient(var(--accent), var(--accent)),
    repeating-linear-gradient(0deg, rgba(182, 71, 12, 0.07) 0, rgba(182, 71, 12, 0.07) 1px, transparent 1px, transparent 40px),
    repeating-linear-gradient(90deg, rgba(182, 71, 12, 0.07) 0, rgba(182, 71, 12, 0.07) 1px, transparent 1px, transparent 40px);
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 3rem;
  align-items: center;
}

.eyebrow {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 0.6rem;
}

h1, h2, h3 {
  font-family: var(--serif);
  line-height: 1.2;
  font-weight: 700;
  color: var(--ink);
}

h1 {
  font-size: clamp(2.2rem, 4.6vw, 3.8rem);
  margin: 0 0 1.2rem;
}

h2 {
  font-size: clamp(1.6rem, 2.6vw, 2.2rem);
  margin: 0.2rem 0 1rem;
}

.hero-copy {
  color: var(--muted);
  font-size: 1.12rem;
  max-width: 680px;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.button {
  display: inline-block;
  padding: 0.8rem 1.3rem;
  border-radius: 3px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
}

.button.primary {
  background: var(--primary);
  color: #fff;
}

.button.primary:hover {
  background: var(--primary-dark);
  text-decoration: none;
}

.button.secondary {
  border-color: var(--ink);
  background: transparent;
  color: var(--ink);
}

.button.secondary:hover {
  background: var(--ink);
  color: #fff;
  text-decoration: none;
}

.hero-card,
.article-card,
.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--primary);
  border-radius: 4px;
}

.hero-card {
  padding: 1.7rem;
}

.hero-card h2 {
  font-size: 1.2rem;
  font-family: var(--sans);
}

.hero-card ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.hero-card li {
  margin-bottom: 0.5rem;
}

.section {
  padding: 72px 0;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.section-heading input {
  width: min(320px, 100%);
  padding: 0.8rem 1rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  font: inherit;
  background: var(--surface);
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}

.article-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.article-card h3 {
  margin-top: 0.6rem;
  font-size: 1.15rem;
}

.article-card p {
  color: var(--muted);
  flex-grow: 1;
}

.article-card a {
  font-weight: 700;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.category {
  display: inline-block;
  background: var(--accent);
  color: var(--primary-dark);
  padding: 0.25rem 0.6rem;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  width: fit-content;
}

.byline {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 0.75rem;
}

.newsletter {
  padding: 58px 0;
  background: var(--ink);
  color: #fff;
}

.newsletter h2 {
  color: #fff;
}

.newsletter-inner form {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.newsletter-inner input {
  min-width: min(360px, 100%);
  padding: 0.85rem 1rem;
  border-radius: 3px;
  border: 1px solid var(--ink-line);
  font: inherit;
}

.form-message {
  margin-bottom: 0;
  color: #cfd4dc;
}

.site-footer {
  background: var(--ink);
  color: #b9bfc9;
  padding: 44px 0 24px;
  border-top: 4px solid var(--primary);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
}

.footer-grid strong {
  color: #fff;
  font-family: var(--mono);
}

.footer-links {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: #b9bfc9;
}

.footer-links a:hover {
  color: #fff;
}

.copyright {
  border-top: 1px solid var(--ink-line);
  margin-top: 2rem;
  padding-top: 1.2rem;
  font-size: 0.85rem;
  font-family: var(--mono);
  color: #8b91a0;
}

.page-hero {
  padding: 65px 0 30px;
}

.page-hero p:not(.eyebrow) {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 640px;
}

.content-card {
  padding: 2rem;
  margin-bottom: 4rem;
}

.content-card img {
  max-width: 100%;
}

.content-card code {
  background: var(--accent);
  color: var(--primary-dark);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 0.9em;
}

.content-card h2 {
  font-size: 1.4rem;
  margin-top: 2rem;
}

.content-card h2:first-child {
  margin-top: 0;
}

.diagram {
  margin: 1.4rem 0 2rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  background: var(--surface);
}

.diagram img {
  display: block;
  width: 100%;
  height: auto;
}

.diagram figcaption {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--border);
  background: var(--background);
}

.contact-form {
  display: grid;
  gap: 1rem;
}

.contact-form label {
  font-weight: 600;
  font-size: 0.95rem;
}

.contact-form input,
.contact-form textarea {
  display: block;
  width: 100%;
  margin-top: 0.4rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  font: inherit;
  background: var(--surface);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--primary);
}

.hidden {
  display: none !important;
}

.not-found {
  padding: 120px 0;
  text-align: center;
}

.not-found .eyebrow {
  justify-content: center;
}

@media (max-width: 800px) {
  .hero-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .section-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .menu-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--background);
    padding: 1rem 4%;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links.open {
    display: flex;
  }

  .footer-grid {
    flex-direction: column;
  }
}