:root {
  --page-bg: #f6f9fc;
  --surface: #ffffff;
  --surface-alt: #eef6fb;
  --text-strong: #0f172a;
  --text-muted: #52607a;
  --border-soft: rgba(22, 18, 244, 0.12);
  --border-strong: rgba(22, 18, 244, 0.24);
  --accent: #12a5f4;
  --accent-deep: #1612f4;
  --shadow: 0 24px 80px rgba(15, 23, 42, 0.08);
  --content-width: 75rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Source Sans 3", sans-serif;
  color: var(--text-strong);
  background:
    radial-gradient(circle at top left, rgba(18, 165, 244, 0.12), transparent 24rem),
    linear-gradient(180deg, #fdfefe 0%, var(--page-bg) 100%);
  line-height: 1.65;
}

a {
  color: var(--accent-deep);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

img {
  display: block;
  max-width: 100%;
  border-radius: 1rem;
}

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.site-shell {
  width: min(calc(100% - 2rem), var(--content-width));
  margin: 0 auto;
}

.site-header {
  padding: 1.5rem 0 0;
}

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0 1.5rem;
  border-bottom: 1px solid var(--border-soft);
}

.brand {
  display: inline-flex;
  gap: 1rem;
  align-items: center;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 0.9rem;
  background: linear-gradient(145deg, var(--accent), var(--accent-deep));
  color: white;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.brand-copy {
  display: grid;
}

.brand-copy strong {
  font-size: 1.05rem;
}

.brand-copy small,
.top-nav a,
.post-meta,
.card-meta,
.card-footer span,
.footer-heading,
.citation-source {
  color: var(--text-muted);
}

.top-nav {
  display: flex;
  gap: 1.25rem;
}

.top-nav a {
  text-decoration: none;
  font-weight: 600;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(18rem, 0.8fr);
  gap: 2rem;
  padding: 3.5rem 0 2.5rem;
}

.eyebrow,
.panel-label,
.type-pill {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 700;
}

.eyebrow {
  color: var(--accent-deep);
}

.hero h1,
.post-header h1 {
  margin: 0;
  font-family: "Merriweather", serif;
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.hero h1 {
  max-width: 12ch;
  font-size: clamp(2.8rem, 6vw, 5.2rem);
}

.hero-text,
.post-summary,
.post-card p,
.site-footer p {
  font-size: 1.16rem;
  color: var(--text-muted);
}

.hero-panel,
.post-card,
.share-strip,
.citations,
.post-body blockquote,
.post-body pre,
.post-body table {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-soft);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 1.5rem;
  border-radius: 1.5rem;
  align-self: end;
}

.hero-panel ul {
  margin: 0.8rem 0 0;
  padding-left: 1.2rem;
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
  padding-bottom: 4rem;
}

.post-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 18rem;
  padding: 1.5rem;
  border-radius: 1.35rem;
}

.post-card h2 {
  margin: 0;
  font-family: "Merriweather", serif;
  font-size: clamp(1.7rem, 2.6vw, 2.2rem);
  line-height: 1.16;
}

.card-meta,
.post-meta,
.card-footer,
.share-strip {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  flex-wrap: wrap;
}

.type-pill {
  display: inline-flex;
  padding: 0.38rem 0.7rem;
  border-radius: 999px;
  background: rgba(18, 165, 244, 0.1);
  color: var(--accent-deep);
}

.card-footer {
  margin-top: auto;
  justify-content: space-between;
}

.read-link {
  font-weight: 700;
}

.post-template {
  max-width: 52rem;
  margin: 0 auto;
  padding: 2.8rem 0 4rem;
}

.post-header {
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-soft);
}

.post-header h1 {
  margin-top: 0.35rem;
  font-size: clamp(2.8rem, 5vw, 4.7rem);
}

.post-body {
  padding: 2rem 0;
  font-size: 1.12rem;
}

.post-body h2,
.post-body h3 {
  margin-top: 2.6rem;
  font-family: "Merriweather", serif;
  line-height: 1.2;
}

.post-body figure,
.post-body .mermaid {
  margin: 2rem 0;
}

.post-body figcaption {
  margin-top: 0.7rem;
  font-size: 0.98rem;
  color: var(--text-muted);
}

.post-body blockquote,
.post-body pre,
.post-body table {
  margin: 1.8rem 0;
  padding: 1.25rem 1.4rem;
  border-radius: 1.15rem;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
}

.post-body th,
.post-body td {
  padding: 0.9rem;
  border-bottom: 1px solid var(--border-soft);
  text-align: left;
}

.citations,
.share-strip {
  padding: 1.35rem 1.4rem;
  border-radius: 1.25rem;
  margin-top: 1.2rem;
}

.citations h2 {
  margin-top: 0;
  font-size: 1.4rem;
}

.citations ol {
  margin: 0;
  padding-left: 1.15rem;
}

.citation-source {
  display: block;
  margin-top: 0.2rem;
}

.share-strip {
  justify-content: space-between;
}

.share-strip p {
  margin: 0;
  font-weight: 700;
}

.share-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.share-links a {
  display: inline-flex;
  align-items: center;
  min-height: 2.8rem;
  padding: 0 1rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  text-decoration: none;
  font-weight: 700;
}

.site-footer {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
  padding: 1.8rem 0 3rem;
  border-top: 1px solid var(--border-soft);
}

@media (max-width: 800px) {
  .masthead,
  .hero,
  .post-grid,
  .site-footer,
  .share-strip {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }

  .post-grid,
  .site-footer {
    display: grid;
  }

  .top-nav {
    flex-wrap: wrap;
  }

  .post-card {
    min-height: auto;
  }
}