.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 2px solid var(--line);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  backdrop-filter: blur(12px);
}
.header-inner {
  width: min(var(--wide), calc(100% - 2rem));
  min-height: 72px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.site-logo {
  color: var(--ink);
  font: 800 1.2rem/1 var(--body);
  text-decoration: none;
  letter-spacing: -0.03em;
}
.site-logo span {
  display: inline-block;
  padding: 0.4rem 0.55rem;
  color: var(--white);
  background: var(--cobalt);
  transform: rotate(-1deg);
}
.desktop-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  font: 700 0.8rem/1 var(--mono);
  text-transform: uppercase;
}
.desktop-nav a {
  color: var(--ink);
  text-decoration: none;
}
.mobile-nav {
  display: none;
}
.mobile-nav summary {
  min-width: 5.5rem;
  padding: 0.7rem 0.85rem;
  color: var(--white);
  background: var(--ink);
  border: 2px solid var(--ink);
  font: 800 0.78rem/1 var(--mono);
  text-align: center;
  text-transform: uppercase;
  cursor: pointer;
  list-style: none;
}
.mobile-nav summary::-webkit-details-marker {
  display: none;
}
.mobile-nav[open] summary {
  color: var(--ink);
  background: var(--lime);
}
.mobile-nav nav {
  position: absolute;
  right: 1rem;
  left: 1rem;
  top: calc(100% + 2px);
  padding: var(--space-3);
  background: var(--white);
  border: 2px solid var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
  display: grid;
}
.mobile-nav nav a {
  min-height: 48px;
  padding: 0.85rem 0.5rem;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  font: 800 0.82rem/1.3 var(--mono);
  text-decoration: none;
  text-transform: uppercase;
}

.topic-nav {
  color: var(--white);
  background: var(--cobalt-dark);
  border-top: 2px solid var(--ink);
}
.topic-nav > div {
  width: min(var(--wide), calc(100% - 2rem));
  margin: auto;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
}
.topic-nav a {
  min-height: 48px;
  padding: 0.85rem 0.7rem;
  display: grid;
  place-items: center;
  color: var(--white);
  border-inline-start: 1px solid #ffffff66;
  font: 800 0.72rem/1.2 var(--mono);
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
}
.topic-nav a:last-child { border-inline-end: 1px solid #ffffff66; }
.topic-nav a:hover { color: var(--ink); background: var(--lime); }

.home-hero,
.answer-index,
.home-trust,
.answer-shell,
.trust-page {
  width: min(var(--wide), calc(100% - 2rem));
  margin-inline: auto;
}
.home-hero {
  min-height: 72vh;
  padding: var(--space-7) 0;
  display: grid;
  grid-template-columns: 1.45fr 0.55fr;
  align-items: center;
  gap: clamp(2rem, 7vw, 7rem);
}
.eyebrow,
.answer-label {
  margin: 0 0 var(--space-3);
  color: var(--cobalt-dark);
  font: 800 0.76rem/1.4 var(--mono);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
h1,
h2,
h3 {
  text-wrap: balance;
}
.home-hero h1,
.answer-header h1,
.trust-page h1 {
  margin: 0;
  font: 700 clamp(3rem, 8vw, 7rem)/0.92 var(--display);
  letter-spacing: -0.055em;
}
.home-hero > div > p:not(.eyebrow) {
  max-width: 700px;
  margin: var(--space-5) 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.65;
}
.cta {
  display: inline-block;
  padding: 0.9rem 1.2rem;
  color: var(--white);
  background: var(--cobalt);
  border: 2px solid var(--ink);
  box-shadow: 5px 5px 0 var(--ink);
  font-weight: 800;
  text-decoration: none;
}
.cta:hover {
  box-shadow: 2px 2px 0 var(--ink);
  transform: translate(3px, 3px);
}
.index-card {
  margin: 0;
  padding: var(--space-5);
  background: var(--lime);
  border: 2px solid var(--line);
  border-radius: var(--radius-small) var(--radius-large);
  box-shadow: var(--shadow-offset);
  display: grid;
  gap: 0.25rem;
  transform: rotate(1.5deg);
}
.index-card span {
  font: 800 4.5rem/0.9 var(--display);
}
.index-card strong {
  margin-bottom: var(--space-4);
  font-size: 0.9rem;
  text-transform: uppercase;
}
.index-card figcaption {
  padding-top: var(--space-3);
  border-top: 2px solid var(--line);
  font: 700 0.75rem/1.5 var(--mono);
}
.method-strip {
  border-block: 2px solid var(--line);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--ink);
  color: var(--white);
}
.method-strip p {
  margin: 0;
  padding: var(--space-4);
  border-right: 1px solid #ffffff55;
  font-weight: 700;
}
.method-strip span {
  color: var(--lime);
  font-family: var(--mono);
}

.answer-index {
  padding: var(--space-7) 0;
}

.answer-finder,
.topic-taxonomy,
.featured-answers {
  width: min(var(--wide), calc(100% - 2rem));
  margin-inline: auto;
}
.answer-finder {
  margin-bottom: var(--space-6);
  padding: var(--space-5);
  display: grid;
  grid-template-columns: repeat(var(--qa-cols), minmax(0, 1fr));
  gap: var(--qa-gutter);
  background: var(--white);
  border: 3px solid var(--ink);
  box-shadow: 10px 10px 0 var(--cobalt);
}
.answer-finder > div { grid-column: 1 / 7; }
.answer-finder .search-box { grid-column: 7 / 13; align-self: center; }
.answer-finder > p:last-child {
  grid-column: 7 / 13;
  margin: 0;
  font: 700 0.75rem/1.5 var(--mono);
}
.answer-finder h2,
.topic-taxonomy h2,
.featured-answers h2 {
  margin: 0;
  font: 700 clamp(2.2rem, 5vw, 4.5rem)/0.96 var(--display);
  letter-spacing: -0.045em;
}
.answer-finder > div > p:last-child,
.featured-answers header > p:last-child {
  color: var(--ink-soft);
  line-height: 1.65;
}
.topic-taxonomy,
.featured-answers { padding: var(--space-6) 0; }
.topic-taxonomy > header,
.featured-answers > header { max-width: 780px; margin-bottom: var(--space-5); }
.topic-taxonomy > div {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 3px solid var(--ink);
  box-shadow: 8px 8px 0 var(--ink);
}
.topic-card {
  min-height: 200px;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  color: var(--ink);
  background: var(--lime);
  border-inline-end: 2px solid var(--ink);
  text-decoration: none;
}
.topic-card:nth-child(2n) { background: var(--coral); }
.topic-card:nth-child(3) { background: var(--white); }
.topic-card:last-child { border-inline-end: 0; }
.topic-card > span { color: var(--cobalt-dark); font: 800 0.8rem/1 var(--mono); }
.topic-card > strong { margin: auto 0 var(--space-3); font: 700 1.35rem/1.05 var(--display); }
.topic-card > small { font: 700 0.7rem/1.4 var(--mono); text-transform: uppercase; }
.featured-answers > div {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.featured-answers a {
  min-height: 180px;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  color: var(--ink);
  background: var(--paper-deep);
  border: 2px solid var(--ink);
  text-decoration: none;
}
.featured-answers a:nth-child(2),
.featured-answers a:nth-child(5) { background: var(--cobalt); color: var(--white); }
.featured-answers a > span { color: var(--coral); font: 800 0.8rem/1 var(--mono); }
.featured-answers a > strong { margin: auto 0 var(--space-3); font: 700 1.3rem/1.15 var(--display); }
.featured-answers a > small { font: 700 0.7rem/1.4 var(--mono); text-transform: uppercase; }
.answer-index > header {
  max-width: 700px;
  margin-bottom: var(--space-6);
}
.answer-index h2,
.home-trust h2 {
  margin: 0;
  font: 700 clamp(2.4rem, 5vw, 4.7rem)/0.95 var(--display);
  letter-spacing: -0.04em;
}
.answer-index > header > p:last-child {
  color: var(--ink-soft);
  font-size: 1.1rem;
}
.answer-list {
  border-top: 2px solid var(--line);
}
.answer-list > a {
  padding: var(--space-5) 0;
  display: grid;
  grid-template-columns: 70px minmax(260px, 0.75fr) 1.25fr;
  gap: var(--space-5);
  align-items: start;
  color: var(--ink);
  border-bottom: 2px solid var(--line);
  text-decoration: none;
}
.answer-list > a:hover {
  padding-inline: var(--space-3);
  background: var(--white);
}
.answer-list span {
  color: var(--coral);
  font: 800 1.3rem/1 var(--mono);
}
.answer-list h3 {
  margin: 0;
  font: 700 1.6rem/1.1 var(--display);
}
.answer-list p {
  margin: 0;
  color: var(--ink-soft);
  line-height: 1.65;
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: var(--card-copy-max-lines);
}
.home-trust {
  margin-bottom: var(--space-7);
  padding: var(--space-6);
  color: var(--white);
  background: var(--cobalt-dark);
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: var(--space-6);
  border-radius: var(--radius-large) var(--radius-small);
}
.home-trust .eyebrow {
  color: var(--lime);
}
.home-trust p {
  margin: 0;
  color: var(--on-dark-muted);
  font-size: 1.08rem;
  line-height: 1.75;
}
.home-trust a {
  color: var(--lime);
}
.home-guide {
  width: min(var(--wide), calc(100% - 2rem));
  margin: auto;
  padding: var(--space-7) 0;
}
.home-guide > header {
  max-width: 820px;
  margin-bottom: var(--space-6);
}
.home-guide > header h2 {
  margin: 0;
  font: 700 clamp(2.6rem, 6vw, 5.4rem)/0.95 var(--display);
  letter-spacing: -0.045em;
}
.home-guide > header p:last-child {
  color: var(--ink-soft);
  font-size: 1.2rem;
  line-height: 1.7;
}
.home-guide > section {
  max-width: var(--measure);
  margin: auto;
  padding: var(--space-5) 0;
  border-bottom: 2px solid var(--line);
}
.home-guide h3 {
  margin: 0 0 var(--space-4);
  font: 700 clamp(1.8rem, 4vw, 3rem)/1 var(--display);
}
.home-guide p,
.home-guide li {
  font-size: 1.05rem;
  line-height: 1.78;
}
.model-map,
.device-matrix {
  margin: var(--space-6) 0;
  border: 2px solid var(--line);
  background: var(--white);
}
.model-map > div {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.model-map article {
  min-height: 210px;
  padding: var(--space-4);
  border-right: 2px solid var(--line);
}
.model-map article:last-child {
  border-right: 0;
}
.model-map span {
  color: var(--coral);
  font: 800 1rem/1 var(--mono);
}
.model-map h3 {
  margin: var(--space-5) 0 var(--space-2);
  font-size: 1.25rem;
}
.model-map p {
  font-size: 0.9rem;
  line-height: 1.55;
}
.model-map figcaption,
.device-matrix figcaption {
  padding: var(--space-3);
  color: var(--white);
  background: var(--ink);
  font: 700 0.75rem/1.5 var(--mono);
}
.device-matrix {
  overflow-x: auto;
}
.device-matrix table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}
.device-matrix caption {
  padding: var(--space-3);
  color: var(--ink);
  background: var(--lime);
  font: 800 1rem/1.4 var(--mono);
  text-align: left;
}
.device-matrix th,
.device-matrix td {
  padding: var(--space-3);
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  line-height: 1.5;
}
.device-matrix th {
  color: var(--white);
  background: var(--cobalt-dark);
}

.answer-shell {
  padding: var(--space-7) 0;
}
.answer-header {
  max-width: 1000px;
}
.answer-header h1 {
  font-size: clamp(2.9rem, 7vw, 6.5rem);
}
.crumbs {
  margin-bottom: var(--space-6);
  display: flex;
  gap: 0.7rem;
  font: 700 0.75rem/1 var(--mono);
  text-transform: uppercase;
}
.dek {
  max-width: 680px;
  color: var(--ink-soft);
  font-size: 1.15rem;
}
.direct-answer {
  max-width: 960px;
  margin: var(--space-6) 0;
  padding: var(--space-5);
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: var(--radius-small) var(--radius-large);
  box-shadow: var(--shadow-offset);
}
.direct-answer > p:last-child {
  margin: 0;
  font: 700 clamp(1.3rem, 2.5vw, 1.8rem)/1.45 var(--display);
}
.article-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: clamp(2rem, 6vw, 6rem);
}
.article-copy {
  max-width: var(--measure);
}
.article-copy > section {
  padding: var(--space-5) 0;
  border-bottom: 2px solid var(--line);
}
.article-copy h2 {
  margin: 0 0 var(--space-4);
  font: 700 clamp(2rem, 4vw, 3.3rem)/1 var(--display);
  letter-spacing: -0.035em;
}
.article-copy p,
.article-copy li {
  font-size: 1.05rem;
  line-height: 1.78;
}
.decision-flow {
  margin: var(--space-6) 0;
  border: 2px solid var(--line);
  background: var(--paper-deep);
}
.flow-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.flow-track > div {
  min-height: 180px;
  padding: var(--space-4);
  border-right: 2px solid var(--line);
}
.flow-track > div:last-child {
  border: 0;
}
.flow-track span {
  display: block;
  margin-bottom: var(--space-5);
  color: var(--coral);
  font: 800 0.9rem/1 var(--mono);
}
.flow-track strong {
  display: block;
  font-size: 1.05rem;
}
.flow-track p {
  margin-bottom: 0;
  font-size: 0.86rem;
  line-height: 1.5;
}
.decision-flow figcaption {
  padding: var(--space-3);
  color: var(--on-dark-muted);
  background: var(--ink);
  font: 700 0.75rem/1.5 var(--mono);
}
.diagnostic-steps {
  padding: 0;
  list-style: none;
  counter-reset: steps;
}
.diagnostic-steps li {
  position: relative;
  padding: var(--space-5) 0 var(--space-5) 76px;
  border-top: 1px solid var(--line);
  counter-increment: steps;
}
.diagnostic-steps li::before {
  content: counter(steps, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: var(--space-5);
  color: var(--cobalt);
  font: 800 1.5rem/1 var(--mono);
}
.diagnostic-steps h3,
.outcome-grid h3 {
  margin: 0;
  font: 700 1.4rem/1.2 var(--display);
}
.outcome-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}
.outcome-grid article {
  padding: var(--space-4);
  background: var(--white);
  border: 1px solid var(--line);
}
.outcome-grid p {
  font-size: 0.92rem;
  line-height: 1.6;
}
.limit-list {
  padding-left: 1.3rem;
}
.limit-list li {
  padding: 0.5rem 0;
}
.product-note {
  margin: var(--space-6) 0;
  padding: var(--space-5);
  background: var(--lime);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-offset);
}
.product-note h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}
.product-note .cta {
  margin-top: var(--space-3);
}
.sources ul {
  padding: 0;
  list-style: none;
}
.source-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-top: 1px solid var(--line);
}
.source-item span {
  font: 700 0.72rem/1.5 var(--mono);
}
.article-credit {
  padding: var(--space-5) 0;
  color: var(--ink-soft);
}
.related {
  position: sticky;
  top: 110px;
  align-self: start;
  padding: var(--space-4);
  background: var(--coral);
  border: 2px solid var(--line);
  box-shadow: 6px 6px 0 var(--ink);
}
.related h2 {
  font: 700 1.7rem/1 var(--display);
}
.related a {
  display: block;
  padding: var(--space-3) 0;
  color: var(--ink);
  border-top: 1px solid var(--line);
  font-weight: 800;
}

.trust-page {
  max-width: 800px;
  min-height: 65vh;
  padding: var(--space-7) 0;
}
.trust-page h1 {
  margin-bottom: var(--space-6);
}
.trust-page h2 {
  margin-top: var(--space-6);
  font: 700 2.1rem/1 var(--display);
}
.trust-page p {
  font-size: 1.1rem;
  line-height: 1.8;
}
.updated {
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: 2px solid var(--line);
  font-family: var(--mono);
}

.site-footer {
  padding: var(--space-6) max(1rem, calc((100% - var(--wide)) / 2));
  color: var(--white);
  background: var(--ink);
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: var(--space-6);
}
.site-footer .site-logo {
  color: var(--white);
}
.site-footer > div {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.65rem;
}
.site-footer h2 {
  margin: 0;
  font-size: 0.85rem;
  text-transform: uppercase;
}
.site-footer p {
  max-width: 420px;
  margin: 0;
  color: var(--on-dark-muted);
  line-height: 1.55;
}
.site-footer a {
  color: var(--white);
}

@media (max-width: 900px) {
  .home-hero,
  .home-trust,
  .article-grid {
    grid-template-columns: 1fr;
  }
  .related {
    position: static;
  }
  .flow-track {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow-track > div:nth-child(2) {
    border-right: 0;
  }
  .flow-track > div:nth-child(-n + 2) {
    border-bottom: 2px solid var(--line);
  }
  .answer-list > a {
    grid-template-columns: 48px 1fr;
  }
  .answer-list p {
    grid-column: 2;
  }
  .model-map > div {
    grid-template-columns: repeat(2, 1fr);
  }
  .topic-taxonomy > div { grid-template-columns: repeat(2, 1fr); }
  .topic-card { border-bottom: 2px solid var(--ink); }
  .topic-card:nth-child(2n) { border-inline-end: 0; }
  .featured-answers > div { grid-template-columns: repeat(2, 1fr); }
  .model-map article:nth-child(2) {
    border-right: 0;
  }
  .model-map article:nth-child(-n + 2) {
    border-bottom: 2px solid var(--line);
  }
}

@media (max-width: 650px) {
  .header-inner {
    padding: 0.75rem 0;
    align-items: center;
    flex-direction: row;
  }
  .desktop-nav {
    display: none;
  }
  .topic-nav {
    display: none;
  }
  .mobile-nav {
    display: block;
    margin-left: auto;
  }
  .home-hero h1,
  .answer-header h1,
  .trust-page h1 {
    line-height: 1.02;
  }
  .home-hero {
    padding-top: var(--space-6);
  }
  .answer-finder {
    grid-template-columns: 1fr;
    padding: var(--space-4);
    box-shadow: 6px 6px 0 var(--cobalt);
  }
  .answer-finder > div,
  .answer-finder .search-box,
  .answer-finder > p:last-child { grid-column: 1; }
  .topic-taxonomy > div,
  .featured-answers > div { grid-template-columns: 1fr; }
  .topic-card,
  .topic-card:nth-child(2n) { min-height: 150px; border-inline-end: 0; }
  .method-strip,
  .flow-track,
  .outcome-grid,
  .site-footer {
    grid-template-columns: 1fr;
  }
  .method-strip p,
  .flow-track > div {
    border-right: 0;
    border-bottom: 1px solid #ffffff55;
  }
  .flow-track > div {
    min-height: auto;
  }
  .diagnostic-steps li {
    padding-left: 48px;
  }
  .source-item {
    grid-template-columns: 1fr;
  }
  .answer-list > a {
    display: block;
    margin-bottom: var(--space-3);
    padding: var(--space-5);
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-small) var(--radius-large);
  }
  .answer-list h3 {
    margin: 0.7rem 0;
  }
  .model-map > div {
    grid-template-columns: 1fr;
  }
  .model-map article {
    border-right: 0;
    border-bottom: 2px solid var(--line);
  }
}

.topic-shelf,
.topic-page,
.route-exercise,
.case-note {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
}

.topic-shelf {
  padding: var(--space-7) 0;
}

.topic-shelf > div {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: var(--space-4);
}

.topic-shelf a {
  display: grid;
  gap: var(--space-2);
  min-height: 132px;
  padding: var(--space-5);
  color: var(--ink);
  background: var(--lime);
  border: 3px solid var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
  text-decoration: none;
}

.topic-shelf a:nth-child(2n) { background: var(--coral); }
.topic-shelf a:nth-child(3n) { background: var(--paper); }

.topic-brief,
.route-exercise,
.case-note {
  margin-block: var(--space-8);
  padding: clamp(1.25rem, 3vw, 2.5rem);
  background: var(--paper);
  border: 3px solid var(--ink);
  box-shadow: 8px 8px 0 var(--cobalt);
}

.search-box {
  display: grid;
  gap: var(--space-2);
  max-width: 620px;
  font-weight: 800;
}

.search-box input {
  width: 100%;
  padding: 0.9rem 1rem;
  color: var(--ink);
  background: var(--paper);
  border: 3px solid var(--ink);
  border-radius: 0;
  font: inherit;
}

.answer-list > a[hidden] { display: none; }

@media (max-width: 650px) {
  .topic-shelf,
  .topic-page,
  .route-exercise,
  .case-note { width: min(100% - 1rem, 1180px); }
  .topic-shelf > div { grid-template-columns: 1fr; }
}