:root {
  --engineering-navy: #0f2138;
  --engineering-navy-soft: #18324f;
  --engineering-cream: #f8f5ed;
  --engineering-paper: #fffdf8;
  --engineering-rose: #b23b3b;
  --engineering-sage: #5c7a6b;
  --engineering-gold: #c99a3d;
  --engineering-line: rgba(26, 43, 68, 0.14);
}

.engineering-page,
.engineering-article-page {
  background:
    radial-gradient(circle at 10% 5%, rgba(201, 154, 61, 0.09), transparent 28rem),
    radial-gradient(circle at 92% 12%, rgba(178, 59, 59, 0.07), transparent 30rem),
    var(--engineering-cream);
}

.engineering-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(44px, 7vw, 88px) 0 84px;
}

.engineering-hero {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: clamp(34px, 6vw, 76px);
  align-items: end;
  padding: clamp(34px, 6vw, 72px);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 28px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.035), transparent 54%),
    linear-gradient(145deg, var(--engineering-navy), var(--engineering-navy-soft));
  color: #f8f5ed;
  box-shadow: 0 32px 80px rgba(15, 33, 56, 0.2);
}

.engineering-hero::after {
  content: '';
  position: absolute;
  width: 360px;
  height: 360px;
  right: -170px;
  top: -190px;
  border: 70px solid rgba(244, 178, 178, 0.08);
  border-radius: 50%;
}

.engineering-eyebrow,
.article-eyebrow,
.engineering-card-kicker {
  margin: 0 0 12px;
  color: #f4b2b2;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.engineering-hero h1,
.article-hero h1 {
  max-width: 900px;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(42px, 7vw, 78px);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.engineering-hero-copy > p:not(.engineering-eyebrow),
.article-hero-deck {
  max-width: 720px;
  margin: 26px 0 0;
  color: rgba(248, 245, 237, 0.78);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.65;
}

.engineering-principles {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.engineering-principles li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 16px;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.045);
  color: rgba(248, 245, 237, 0.82);
  font-size: 13px;
  line-height: 1.5;
}

.engineering-principles span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: rgba(244, 178, 178, 0.13);
  color: #f4b2b2;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
}

.engineering-intro {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(32px, 6vw, 84px);
  align-items: start;
  padding: clamp(52px, 8vw, 96px) clamp(6px, 3vw, 30px);
}

.engineering-intro h2,
.engineering-section-heading h2,
.article-content h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 4.6vw, 48px);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.engineering-intro-copy p,
.engineering-section-heading p {
  margin: 0 0 18px;
  color: var(--ic-ink-soft);
  font-size: 17px;
  line-height: 1.75;
}

.engineering-section-heading {
  max-width: 760px;
  margin-bottom: 32px;
}

.engineering-section-heading p {
  margin-top: 18px;
}

.engineering-articles {
  padding: 0 clamp(6px, 3vw, 30px);
}

.engineering-feature-card {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(250px, 0.8fr);
  overflow: hidden;
  border: 1px solid var(--engineering-line);
  border-radius: 24px;
  background: var(--engineering-paper);
  box-shadow: 0 22px 58px rgba(26, 43, 68, 0.1);
}

.engineering-feature-copy {
  padding: clamp(30px, 5vw, 60px);
}

.engineering-feature-copy h3 {
  max-width: 760px;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 4.5vw, 48px);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.engineering-feature-copy p {
  max-width: 720px;
  margin: 20px 0 0;
  color: var(--ic-ink-soft);
  font-size: 16px;
  line-height: 1.75;
}

.engineering-feature-meta,
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 24px 0 0;
  color: var(--ic-ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.035em;
}

.engineering-feature-link,
.engineering-secondary-link,
.article-cta-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
  color: var(--engineering-rose);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.035em;
  text-decoration: none;
}

.engineering-feature-link:hover,
.engineering-secondary-link:hover,
.article-cta-link:hover {
  text-decoration: underline;
  text-underline-offset: 5px;
}

.engineering-feature-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 430px;
  padding: 34px;
  background:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(145deg, #12263f, #203e5d);
  background-size: 24px 24px, 24px 24px, auto;
}

.engineering-browser-card {
  width: min(100%, 340px);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.075);
  box-shadow: 0 28px 54px rgba(0, 0, 0, 0.22);
  color: #f8f5ed;
}

.engineering-browser-bar {
  display: flex;
  gap: 7px;
  padding: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.engineering-browser-bar i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(244, 178, 178, 0.72);
}

.engineering-browser-body {
  padding: 28px;
}

.engineering-browser-body strong {
  display: block;
  margin-bottom: 20px;
  font-family: var(--font-display);
  font-size: 25px;
  font-weight: 600;
}

.engineering-browser-body span {
  display: block;
  width: 100%;
  height: 9px;
  margin: 9px 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
}

.engineering-browser-body span:nth-of-type(2) { width: 78%; }
.engineering-browser-body span:nth-of-type(3) { width: 62%; }

.engineering-browser-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 9px;
  margin-top: 24px;
}

.engineering-browser-flow b {
  padding: 10px 6px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 9px;
  color: rgba(248, 245, 237, 0.78);
  font-family: var(--font-mono);
  font-size: 8px;
  font-weight: 600;
  text-align: center;
  text-transform: uppercase;
}

.engineering-values {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: clamp(54px, 8vw, 90px) clamp(6px, 3vw, 30px) 0;
}

.engineering-value-card {
  padding: 28px;
  border: 1px solid var(--engineering-line);
  border-radius: 18px;
  background: rgba(255, 253, 248, 0.72);
}

.engineering-value-card strong {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: 23px;
}

.engineering-value-card p {
  margin: 0;
  color: var(--ic-ink-soft);
  line-height: 1.7;
}

.article-shell {
  width: min(1220px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(34px, 6vw, 72px) 0 96px;
}

.article-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 24px;
  color: var(--ic-ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
}

.article-breadcrumb a {
  color: var(--engineering-rose);
  text-decoration: none;
}

.article-breadcrumb a:hover { text-decoration: underline; }

.article-hero {
  overflow: hidden;
  padding: clamp(36px, 7vw, 82px);
  border-radius: 28px;
  background:
    radial-gradient(circle at 88% 12%, rgba(244, 178, 178, 0.13), transparent 22rem),
    linear-gradient(145deg, var(--engineering-navy), var(--engineering-navy-soft));
  color: #f8f5ed;
  box-shadow: 0 32px 80px rgba(15, 33, 56, 0.2);
}

.article-hero h1 {
  max-width: 980px;
  font-size: clamp(42px, 7vw, 80px);
}

.article-meta {
  margin-top: 30px;
  color: rgba(248, 245, 237, 0.68);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: clamp(44px, 7vw, 90px);
  align-items: start;
  width: min(1080px, 100%);
  margin: clamp(54px, 8vw, 92px) auto 0;
}

.article-content {
  min-width: 0;
  font-size: 17px;
  line-height: 1.82;
}

.article-content > p:first-of-type {
  font-size: 21px;
  line-height: 1.7;
}

.article-content p {
  margin: 0 0 24px;
}

.article-content h2 {
  margin: 68px 0 24px;
  scroll-margin-top: 120px;
}

.article-content h3 {
  margin: 38px 0 16px;
  font-family: var(--font-display);
  font-size: 27px;
  line-height: 1.2;
}

.article-content a {
  color: var(--engineering-rose);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.article-content ul,
.article-content ol {
  margin: 0 0 28px;
  padding-left: 1.4em;
}

.article-content li { margin: 10px 0; }

.article-callout,
.article-principle,
.article-source-note {
  margin: 34px 0;
  padding: 24px 26px;
  border: 1px solid var(--engineering-line);
  border-left: 4px solid var(--engineering-rose);
  border-radius: 14px;
  background: var(--engineering-paper);
  box-shadow: 0 12px 30px rgba(26, 43, 68, 0.06);
}

.article-principle {
  border-left-color: var(--engineering-sage);
}

.article-source-note {
  border-left-color: var(--engineering-gold);
  font-size: 14px;
}

.article-callout strong,
.article-principle strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article-architecture {
  margin: 36px 0;
  padding: clamp(22px, 4vw, 34px);
  border-radius: 20px;
  background: var(--engineering-navy);
  color: #f8f5ed;
  box-shadow: 0 20px 48px rgba(15, 33, 56, 0.16);
}

.article-architecture h3 {
  margin-top: 0;
  color: #fff;
}

.architecture-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.architecture-node {
  min-height: 126px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.045);
}

.architecture-node strong {
  display: block;
  margin-bottom: 9px;
  color: #f4b2b2;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.architecture-node span {
  color: rgba(248, 245, 237, 0.78);
  font-size: 13px;
  line-height: 1.55;
}

.article-code {
  overflow-x: auto;
  margin: 30px 0;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  background: #0b192a;
  color: #e9edf2;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  tab-size: 2;
}

.article-code code { font-family: inherit; }

.article-table-wrap {
  overflow-x: auto;
  margin: 32px 0;
}

.article-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  border: 1px solid var(--engineering-line);
  background: var(--engineering-paper);
}

.article-table th,
.article-table td {
  padding: 16px;
  border-bottom: 1px solid var(--engineering-line);
  text-align: left;
  vertical-align: top;
}

.article-table th {
  background: rgba(26, 43, 68, 0.045);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.article-toc {
  position: sticky;
  top: 110px;
  padding: 20px;
  border: 1px solid var(--engineering-line);
  border-radius: 16px;
  background: rgba(255, 253, 248, 0.82);
  backdrop-filter: blur(12px);
}

.article-toc strong {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.article-toc a {
  display: block;
  padding: 7px 0;
  color: var(--ic-ink-soft);
  font-size: 12px;
  line-height: 1.4;
  text-decoration: none;
}

.article-toc a:hover {
  color: var(--engineering-rose);
}

.article-author {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  margin-top: 70px;
  padding: 26px;
  border: 1px solid var(--engineering-line);
  border-radius: 18px;
  background: var(--engineering-paper);
}

.article-author-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 16px;
  background: var(--engineering-navy);
  color: #f4b2b2;
  font-family: var(--font-display);
  font-size: 26px;
}

.article-author strong { display: block; }
.article-author p { margin: 4px 0 0; color: var(--ic-ink-soft); font-size: 14px; line-height: 1.55; }

.article-next {
  margin-top: 60px;
  padding: clamp(28px, 5vw, 48px);
  border-radius: 22px;
  background: linear-gradient(145deg, #fffdf8, #f3efe5);
  border: 1px solid var(--engineering-line);
}

.article-next h2 { margin-top: 0; }

@media (max-width: 900px) {
  .engineering-hero,
  .engineering-feature-card,
  .engineering-intro,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .engineering-feature-visual { min-height: 330px; }
  .engineering-values { grid-template-columns: 1fr; }
  .article-toc { position: static; order: -1; }
  .architecture-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .engineering-shell,
  .article-shell { width: min(100% - 24px, 1180px); }
  .engineering-hero,
  .article-hero { padding: 30px 24px; border-radius: 20px; }
  .engineering-hero h1,
  .article-hero h1 { font-size: clamp(38px, 13vw, 58px); }
  .engineering-feature-copy { padding: 28px 22px; }
  .engineering-feature-visual { min-height: 280px; padding: 24px; }
  .engineering-values { padding-inline: 0; }
  .article-content { font-size: 16px; }
  .article-content > p:first-of-type { font-size: 19px; }
  .article-content h2 { margin-top: 52px; }
  .article-author { grid-template-columns: 1fr; }
}