/* Formula AI blog — shared index and article styles. */

html {
  scroll-behavior: auto;
}

.blog-hero {
  padding: clamp(72px, 9vw, 118px) 0 clamp(64px, 8vw, 100px);
  border-bottom: 1px solid var(--line);
}

.blog-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.58fr);
  gap: clamp(48px, 9vw, 124px);
  align-items: end;
}

.blog-kicker,
.article-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  line-height: 1.5;
}

.blog-kicker::before,
.article-kicker::before {
  width: 20px;
  height: 1px;
  background: currentColor;
  content: "";
}

.blog-hero h1 {
  max-width: 850px;
  color: var(--ink);
  font-size: clamp(42px, 5.2vw, 70px);
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1.22;
  text-wrap: balance;
}

.blog-hero-copy {
  padding-bottom: 7px;
  color: var(--text);
  font-size: 15px;
  line-height: 2;
}

.blog-index {
  padding: clamp(72px, 8vw, 112px) 0 120px;
}

.blog-index-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-bottom: 30px;
}

.blog-index-head h2 {
  color: var(--ink);
  font-size: clamp(28px, 3.2vw, 42px);
  font-weight: 300;
  line-height: 1.4;
}

.feature-article {
  display: grid;
  grid-template-columns: 1.06fr 0.94fr;
  margin-bottom: 24px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: inherit;
  text-decoration: none;
  transition: transform 160ms var(--ease);
}

.feature-visual,
.blog-card-visual {
  position: relative;
  overflow: hidden;
  border-right: 1px solid var(--line);
  background: var(--paper-2);
}

.feature-visual {
  min-height: 0;
  margin-bottom: 0;
  aspect-ratio: auto;
}

.cover-image {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cover-label {
  position: absolute;
  top: 22px;
  left: 22px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 8px 10px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  background: rgba(11, 11, 12, 0.58);
  color: #fff;
  backdrop-filter: blur(10px);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.13em;
  line-height: 1;
}

.cover-label--dark {
  border-color: rgba(11, 11, 12, 0.14);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
}

.cover-label img {
  width: 16px;
  height: 16px;
}

.feature-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(34px, 5vw, 68px);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 21px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
}

.article-meta .category {
  padding: 3px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--text);
}

.article-meta .article-author {
  color: inherit;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
}

.article-meta .article-author:hover {
  color: var(--ink);
}

.feature-copy h3 {
  margin-bottom: 18px;
  color: var(--ink);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 300;
  line-height: 1.48;
  text-wrap: balance;
}

.feature-copy > p,
.blog-card-copy > p {
  color: var(--text);
  font-size: 14px;
  line-height: 1.9;
}

.read-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
}

.read-link::after {
  width: 50px;
  height: 1px;
  background: currentColor;
  content: "";
  transform: scaleX(0.72);
  transform-origin: left center;
  transition: transform 160ms var(--ease);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.blog-card,
.blog-card-link {
  display: grid;
  grid-template-rows: auto 1fr;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: inherit;
  text-decoration: none;
}

.blog-card-link {
  transition: transform 160ms var(--ease);
}

.feature-article:active,
.blog-card-link:active {
  transform: scale(0.98);
}

@media (hover: hover) and (pointer: fine) {
  .feature-article:hover,
  .blog-card-link:hover {
    color: inherit;
    transform: translateY(-1px);
  }

  .feature-article:hover .read-link::after,
  .blog-card-link:hover .read-link::after {
    transform: scaleX(1);
  }
}

.blog-card-visual {
  aspect-ratio: 16 / 9;
  border-right: 0;
  border-bottom: 1px solid var(--line);
}

.blog-card-copy {
  display: flex;
  flex-direction: column;
  padding: 30px 30px 32px;
}

.blog-card-copy h3 {
  margin-bottom: 14px;
  color: var(--ink);
  font-size: 22px;
  font-weight: 300;
  line-height: 1.55;
  text-wrap: balance;
}

/* Article detail */
.insight-hero {
  padding: clamp(62px, 8vw, 106px) 0 clamp(58px, 7vw, 90px);
  border-bottom: 1px solid var(--line);
}

.insight-hero .breadcrumb {
  margin-bottom: clamp(44px, 6vw, 72px);
}

.insight-head {
  max-width: 960px;
}

.insight-head h1 {
  max-width: 940px;
  margin-bottom: 28px;
  color: var(--ink);
  font-size: clamp(38px, 5.4vw, 68px);
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1.28;
  text-wrap: balance;
}

.insight-deck {
  max-width: 760px;
  color: var(--text);
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.95;
}

.insight-head .article-meta {
  margin: 34px 0 0;
}

.insight-section {
  padding: clamp(64px, 8vw, 108px) 0 120px;
}

.insight-layout {
  display: grid;
  grid-template-columns: minmax(0, 720px) minmax(200px, 236px);
  gap: clamp(48px, 7vw, 88px);
  justify-content: center;
  align-items: start;
}

.insight-body {
  min-width: 0;
}

.article-cover {
  margin: 38px 0 56px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper-2);
}

.article-cover img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.article-cover figcaption,
.article-diagram figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.03em;
  line-height: 1.7;
}

.article-diagram {
  margin: 38px 0 56px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.article-diagram-body {
  padding: clamp(24px, 5vw, 42px);
  background:
    linear-gradient(rgba(11, 11, 12, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 11, 12, 0.028) 1px, transparent 1px),
    var(--paper-2);
  background-size: 28px 28px;
}

.diagram-kicker {
  margin-bottom: 22px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
}

.evidence-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 44px minmax(0, 1.12fr);
  gap: 14px;
  align-items: center;
}

.evidence-stack {
  display: grid;
  gap: 9px;
}

.diagram-node,
.diagram-result {
  padding: 15px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink);
  font-size: 12px;
  line-height: 1.55;
}

.diagram-node span,
.diagram-result span {
  display: block;
  margin-bottom: 3px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.diagram-result {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}

.diagram-result span {
  color: rgba(255, 255, 255, 0.58);
}

.diagram-arrow {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 22px;
  text-align: center;
}

.control-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.control-map .diagram-node {
  min-height: 88px;
}

.control-map .control-center {
  grid-column: 2;
  grid-row: 2;
  display: grid;
  place-items: center;
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
  text-align: center;
}

.trace-chain {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 18px minmax(0, 1fr) 18px minmax(0, 1fr) 18px minmax(0, 1fr);
  gap: 7px;
  align-items: stretch;
}

.trace-chain .diagram-node {
  display: flex;
  min-height: 96px;
  flex-direction: column;
  justify-content: center;
}

.trace-chain .diagram-arrow {
  display: grid;
  place-items: center;
  font-size: 16px;
}

.insight-body > p:first-of-type {
  color: var(--ink);
  font-size: 18px;
  line-height: 2;
}

.insight-body p,
.insight-body li {
  color: var(--text);
  font-size: 15px;
  line-height: 2;
}

.insight-body p {
  margin-bottom: 22px;
}

.insight-body h2 {
  margin: 72px 0 24px;
  padding-top: 4px;
  color: var(--ink);
  font-size: clamp(25px, 2.8vw, 32px);
  font-weight: 300;
  line-height: 1.55;
  text-wrap: balance;
}

.insight-body h3 {
  margin: 40px 0 16px;
  color: var(--ink);
  font-size: 20px;
  font-weight: 500;
  line-height: 1.6;
}

.insight-body ul,
.insight-body ol {
  margin: 8px 0 28px;
  padding-left: 1.35em;
}

.insight-body li + li {
  margin-top: 10px;
}

.article-toc {
  position: sticky;
  top: 96px;
  padding-left: 20px;
  border-left: 1px solid var(--line-strong);
}

.article-toc strong {
  display: block;
  margin-bottom: 16px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.16em;
}

.article-toc ol {
  display: grid;
  gap: 10px;
  padding: 0;
  list-style: none;
}

.article-toc a {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
  text-decoration: none;
}

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

.working-model {
  margin: 38px 0;
  padding: 26px 28px 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.working-model strong {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.working-model p:last-child {
  margin-bottom: 0;
}

.working-model ol,
.working-model ul {
  margin: 10px 0 18px;
}

.working-model li {
  font-size: 14px;
}

.article-table-wrap {
  margin: 34px 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.table-scroll-hint {
  display: none;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  margin: 28px 0 -24px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
}

.table-scroll-hint + .article-table-wrap {
  margin-top: 32px;
}

.insight-body h2,
.insight-body h3 {
  scroll-margin-top: 88px;
}

.article-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}

.article-table th,
.article-table td {
  padding: 15px 17px;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  font-size: 13px;
  line-height: 1.7;
  text-align: left;
  vertical-align: top;
}

.article-table th {
  background: var(--paper-2);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.04em;
}

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

.insight-checklist {
  display: grid;
  gap: 0;
  margin: 28px 0 38px;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.insight-checklist li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.insight-checklist .check-no {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.insight-checklist strong {
  color: var(--ink);
  font-weight: 500;
}

.faq-list {
  margin-top: 20px;
  border-top: 1px solid var(--line-strong);
}

.faq-row {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.faq-row dt {
  margin-bottom: 8px;
  color: var(--ink);
  font-weight: 500;
  line-height: 1.7;
}

.faq-row dd {
  color: var(--text);
  font-size: 14px;
  line-height: 1.9;
}

.references {
  margin-top: 68px;
  padding-top: 32px;
  border-top: 1px solid var(--line-strong);
}

.references h2 {
  margin-top: 0;
  font-size: 20px;
  font-weight: 500;
}

.references li,
.references a {
  font-size: 12px;
  line-height: 1.8;
}

.article-next {
  margin-top: 82px;
  padding: 36px;
  border-radius: 10px;
  background: var(--ink);
  color: rgba(255, 255, 255, 0.72);
}

.article-next .section-label {
  color: rgba(255, 255, 255, 0.5);
}

.article-next h2 {
  margin: 0 0 12px;
  color: #fff;
  font-size: 26px;
}

.article-next p {
  margin-bottom: 20px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.article-next a {
  color: #fff;
  font-family: var(--font-mono);
  font-size: 11px;
}

.article-next-links {
  display: flex;
  gap: 12px 24px;
  flex-wrap: wrap;
}

.article-next-links .back-to-blog {
  color: rgba(255, 255, 255, 0.68);
}

.blog-bottom-cta {
  padding: 84px 0;
  border-top: 1px solid var(--line);
  background: #fff;
}

.blog-bottom-cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.blog-bottom-cta h2 {
  max-width: 670px;
  color: var(--ink);
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 300;
  line-height: 1.45;
  text-wrap: balance;
}

@media (max-width: 960px) {
  .blog-hero-grid,
  .feature-article,
  .insight-layout {
    grid-template-columns: 1fr;
  }

  .feature-visual {
    aspect-ratio: 16 / 9;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .article-toc {
    position: static;
    grid-row: 1;
    padding: 22px 24px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
  }

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

@media (max-width: 640px) {
  .table-scroll-hint {
    display: flex;
  }

  .blog-hero-grid {
    gap: 28px;
  }

  .blog-hero h1 {
    font-size: 32px;
    line-height: 1.4;
  }

  .blog-index-head,
  .blog-bottom-cta-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .feature-copy {
    padding: 30px 24px 34px;
  }

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

  .blog-card-copy {
    padding: 26px 24px 28px;
  }

  .insight-head h1 {
    font-size: 37px;
  }

  .insight-deck {
    font-size: 16px;
  }

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

  .insight-body > p:first-of-type {
    font-size: 16px;
  }

  .insight-body p,
  .insight-body li {
    font-size: 15px;
    line-height: 1.95;
  }

  .working-model {
    padding: 22px 20px;
  }

  .article-next {
    padding: 28px 24px;
  }

  .article-cover,
  .article-diagram {
    margin: 30px 0 44px;
  }

  .evidence-flow,
  .control-map,
  .trace-chain {
    grid-template-columns: 1fr;
  }

  .control-map .control-center {
    grid-column: auto;
    grid-row: auto;
  }

  .control-map .diagram-node,
  .trace-chain .diagram-node {
    min-height: 0;
  }

  .diagram-arrow {
    transform: rotate(90deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .feature-article,
  .blog-card-link,
  .read-link::after {
    transition: none;
  }

  .feature-article:hover,
  .feature-article:active,
  .blog-card-link:hover,
  .blog-card-link:active,
  .feature-article:hover .read-link::after,
  .blog-card-link:hover .read-link::after,
  .read-link::after {
    transform: none;
  }
}