:root {
  color-scheme: dark;
  --bg: #080a0d;
  --panel: #10151b;
  --panel-strong: #151c24;
  --text: #edf2f7;
  --muted: #9ba8b6;
  --line: #26313d;
  --accent: #74b4d8;
  --accent-strong: #b7dff2;
  --max: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.5;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(116, 180, 216, 0.08), transparent 360px),
    radial-gradient(circle at 70% 0%, rgba(116, 180, 216, 0.13), transparent 34rem),
    var(--bg);
}

a {
  color: inherit;
  text-decoration: none;
}

.site-shell {
  min-height: 100vh;
}

.site-header {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav {
  align-items: center;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin: 0 auto;
  max-width: var(--max);
  padding: 1.25rem 1.5rem;
}

.brand {
  display: grid;
  gap: 0.1rem;
}

.brand strong {
  font-size: 1rem;
  font-weight: 650;
}

.brand span {
  color: var(--muted);
  font-size: 0.82rem;
}

.nav-links {
  align-items: center;
  display: flex;
  gap: 1rem;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.92rem;
}

.nav-links a:hover {
  color: var(--text);
}

.hero {
  margin: 0 auto;
  max-width: var(--max);
  padding: 5rem 1.5rem 3.5rem;
}

.eyebrow {
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0 0 1.1rem;
  text-transform: uppercase;
}

.eyebrow a {
  color: inherit;
  text-decoration: none;
}

.eyebrow a:hover {
  color: var(--text);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.hero h1 {
  font-size: clamp(3rem, 7vw, 6.8rem);
  letter-spacing: 0;
  line-height: 0.93;
  margin-bottom: 1.4rem;
  max-width: 980px;
}

.hero-copy {
  color: #c8d2dd;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  max-width: 760px;
}

.hero-meta {
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
  margin-top: 2rem;
}

.content-band {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.about-grid {
  display: grid;
  gap: 3rem;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  margin: 0 auto;
  max-width: var(--max);
  padding: 4rem 1.5rem;
}

.about-grid h2,
.section-heading h2,
.contact-band h2 {
  font-size: clamp(2rem, 4vw, 3.8rem);
  letter-spacing: 0;
  line-height: 1;
  margin-bottom: 0;
}

.about-copy {
  color: #cbd5df;
  display: grid;
  gap: 1rem;
}

.about-copy p {
  font-size: 1.08rem;
  margin: 0;
}

.section-stack {
  display: grid;
  gap: 2rem;
  margin: 0 auto;
  max-width: var(--max);
  padding: 4rem 1.5rem;
}

.section-heading {
  max-width: 720px;
}

.focus-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.focus-item {
  background: rgba(16, 21, 27, 0.48);
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 15rem;
  padding: 1.1rem;
}

.topic-card {
  color: inherit;
  display: block;
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

.topic-card:hover {
  border-color: var(--accent-strong);
  transform: translateY(-2px);
}

.focus-item h3 {
  color: var(--text);
  font-size: 1.05rem;
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.focus-item p {
  color: var(--muted);
  font-size: 0.96rem;
  margin-bottom: 0;
}

.main-grid {
  display: grid;
  gap: 3rem;
  grid-template-columns: minmax(0, 1fr) 18rem;
  margin: 0 auto;
  max-width: var(--max);
  padding: 3rem 1.5rem 5rem;
}

.post-list {
  display: grid;
  gap: 1rem;
}

.post-card {
  background: rgba(16, 21, 27, 0.72);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 0.8rem;
  padding: 1.25rem;
}

.post-card:hover {
  border-color: rgba(116, 180, 216, 0.68);
}

.post-card h2 {
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1.12;
  margin: 0;
}

.post-card p {
  color: var(--muted);
  margin: 0;
}

.post-meta {
  color: var(--accent-strong);
  font-size: 0.84rem;
  font-weight: 650;
}

.side-note {
  color: var(--muted);
  font-size: 0.95rem;
}

.side-note h2 {
  color: var(--text);
  font-size: 1rem;
}

.site-footer {
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--muted);
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin: 0 auto;
  max-width: var(--max);
  padding: 1.5rem;
}

.contact-band {
  align-items: end;
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 1fr) auto;
  margin: 0 auto;
  max-width: var(--max);
  padding: 4rem 1.5rem;
}

.contact-band p {
  color: var(--muted);
  font-size: 1.08rem;
  margin: 1rem 0 0;
  max-width: 650px;
}

.contact-link {
  border: 1px solid rgba(116, 180, 216, 0.5);
  border-radius: 8px;
  color: var(--accent-strong);
  display: inline-flex;
  font-weight: 700;
  padding: 0.85rem 1rem;
}

.contact-link:hover {
  background: rgba(116, 180, 216, 0.08);
}

.article-header {
  margin: 0 auto;
  max-width: 900px;
  padding: 4.5rem 1.5rem 2.5rem;
}

.article-header h1 {
  font-size: clamp(2.8rem, 6vw, 5.6rem);
  letter-spacing: 0;
  line-height: 0.96;
  margin-bottom: 1.25rem;
}

.article-summary {
  color: #c8d2dd;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
}

.article {
  margin: 0 auto;
  max-width: 780px;
  padding: 0 1.5rem 5rem;
}

.disclaimer {
  background: rgba(116, 180, 216, 0.08);
  border: 1px solid rgba(116, 180, 216, 0.28);
  border-radius: 8px;
  color: #d5e4ed;
  margin-bottom: 2rem;
  padding: 1rem;
}

.article h2 {
  border-top: 1px solid var(--line);
  font-size: clamp(1.6rem, 3vw, 2.15rem);
  margin: 3rem 0 1rem;
  padding-top: 2rem;
}

.article h3 {
  color: var(--accent-strong);
  font-size: 1.1rem;
  margin: 1.9rem 0 0.6rem;
}

.article p,
.article li {
  color: #cbd5df;
  font-size: 1.06rem;
}

.article a {
  color: var(--accent-strong);
  text-decoration: underline;
  text-decoration-color: rgba(183, 223, 242, 0.45);
  text-underline-offset: 0.18em;
}

.article ul {
  padding-left: 1.25rem;
}

.article ol {
  color: #cbd5df;
  padding-left: 1.25rem;
}

.article blockquote {
  border-left: 3px solid var(--accent);
  color: var(--text);
  font-size: 1.35rem;
  line-height: 1.3;
  margin: 2rem 0;
  padding-left: 1rem;
}

.article-screenshot {
  background: rgba(15, 23, 42, 0.58);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 2rem 0;
  overflow: hidden;
}

.article-screenshot img {
  display: block;
  height: auto;
  width: 100%;
}

.article-screenshot figcaption {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.85rem 1rem;
}

.diagnostic-diagram {
  background: rgba(15, 23, 42, 0.58);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 2.25rem 0;
  padding: 1.5rem;
}

.diagnostic-diagram figcaption {
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  margin-bottom: 1.125rem;
  text-transform: uppercase;
}

.diagram-flow {
  align-items: center;
  color: var(--text);
  display: grid;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  gap: 0.75rem;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  margin-bottom: 1.25rem;
}

.diagram-flow span:not(.diagram-arrow) {
  background: rgba(2, 6, 23, 0.36);
  border: 1px solid rgba(148, 163, 184, 0.34);
  padding: 0.75rem;
  text-align: center;
}

.diagram-flow-secondary {
  margin-top: 0.75rem;
}

.diagram-arrow {
  color: var(--accent);
}

.diagram-states {
  display: grid;
  gap: 0.625rem;
  margin: 0;
}

.diagram-states div {
  border-top: 1px solid rgba(148, 163, 184, 0.18);
  display: grid;
  gap: 1rem;
  grid-template-columns: 180px minmax(0, 1fr);
  padding-top: 0.625rem;
}

.diagram-states dt {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
}

.diagram-states dd {
  color: var(--text);
  margin: 0;
}

.diagram-ladder {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.diagram-ladder div,
.diagram-card {
  background: rgba(2, 6, 23, 0.36);
  border: 1px solid rgba(148, 163, 184, 0.34);
  display: grid;
  gap: 0.35rem;
  min-height: 6.25rem;
  padding: 0.9rem;
}

.diagram-ladder span,
.diagram-card span {
  color: var(--accent-strong);
  font-family:
    "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.diagram-ladder strong,
.diagram-card strong {
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 650;
  line-height: 1.25;
}

.diagram-ladder p,
.diagram-card p {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
  margin: 0;
}

.diagram-grid {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.article pre {
  background: #06080b;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: #dce8ef;
  font-size: 0.95rem;
  line-height: 1.55;
  margin: 1.5rem 0;
  overflow-x: auto;
  padding: 1rem;
}

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

.compare-table {
  border: 1px solid var(--line);
  border-collapse: collapse;
  margin: 1.5rem 0;
  width: 100%;
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--line);
  color: #cbd5df;
  padding: 0.75rem;
  text-align: left;
  vertical-align: top;
}

.compare-table th {
  background: var(--panel-strong);
  color: var(--text);
}

.component-matrix td:first-child {
  color: var(--text);
  font-weight: 650;
  width: 18%;
}

.component-matrix td:last-child {
  color: var(--text);
  font-family:
    "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.82rem;
  white-space: nowrap;
  width: 90px;
}

.table-note {
  color: var(--muted);
  display: inline-block;
  font-size: 0.9rem;
  line-height: 1.45;
  margin-top: 0.2rem;
}

@media (max-width: 820px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .about-grid,
  .contact-band {
    grid-template-columns: 1fr;
  }

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

  .hero {
    padding-top: 3.5rem;
  }

  .diagram-flow {
    grid-template-columns: 1fr;
  }

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

  .diagram-states div {
    gap: 0.25rem;
    grid-template-columns: 1fr;
  }

  .diagram-ladder,
  .diagram-grid {
    grid-template-columns: 1fr;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .focus-grid {
    grid-template-columns: 1fr;
  }

  .focus-item {
    min-height: auto;
  }
}