:root {
  --bg:#1e2430;
  --bg-deep:#171c25;
  --surface:#2a3140;
  --surface-2:#151a24;
  --border:#3a4355;
  --text:#e6eaf2;
  --text-secondary:#aab3c5;
  --text-muted:#7a8499;
  --accent:#e07a2f;
  --accent-hover:#f29a4a;
  --accent-deep:#b35a1f;
  --white-soft:#f5f7fa;
  --max-width:1180px;
  --radius:18px;
  --radius-small:12px;
  --shadow:0 18px 60px rgba(0,0,0,.28);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:radial-gradient(circle at top,rgba(224,122,47,.10),transparent 24%),linear-gradient(180deg,var(--bg-deep) 0%,var(--bg) 100%);
  color:var(--text);
  font-family:Inter,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.72
}
img,svg{display:block;max-width:100%}
a{color:var(--accent);text-decoration:none}
a:hover,a:focus{color:var(--accent-hover)}
code,pre{font-family:"JetBrains Mono","Fira Code",Consolas,monospace}
.container{width:min(var(--max-width),calc(100% - 2rem));margin:0 auto}

.site-header{
  position:sticky;
  top:0;
  z-index:20;
  backdrop-filter:blur(14px);
  background:rgba(23,28,37,.85);
  border-bottom:1px solid rgba(245,247,250,.06)
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1.25rem;
  min-height:78px
}
.brand{display:inline-flex;align-items:center;gap:.85rem;color:var(--text)}
.brand-logo{width:44px;height:44px;flex:0 0 auto}
.brand-text{display:flex;flex-direction:column;gap:.08rem}
.brand-title{font-weight:800;font-size:1.1rem;letter-spacing:.12em}
.site-nav{display:flex;gap:1.1rem}
.site-nav a{color:var(--text-secondary);font-weight:600;font-size:.95rem}
.site-nav a:hover,.site-nav a:focus{color:var(--white-soft)}

.hero{padding:4rem 0 2rem}
.hero-home{padding-top:5rem}
.eyebrow{
  color:var(--accent-hover);
  text-transform:uppercase;
  letter-spacing:.1em;
  font-size:.82rem;
  font-weight:700;
  margin:0 0 1rem
}
.eyebrow.small{font-size:.74rem}
.hero h1{margin:0;font-size:clamp(2.3rem,5vw,4.2rem);line-height:1.04;letter-spacing:-.04em}
.hero-summary{max-width:780px;color:var(--text-secondary);font-size:1.08rem;margin:1.2rem 0 0}

.inline-link-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
}
.inline-link-list > a + a::before{
  content:"|";
  color:var(--text-muted);
  margin:0 .75rem;
  font-weight:600;
}
.hero-actions{
  margin-top:1.6rem
}
.button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:.75rem 0;
  border-radius:0;
  font-weight:700;
  border:none;
  background:none
}
.button-primary{color:#fff3ea}
.button-primary:hover{color:#fff}
.button-secondary{color:var(--white-soft)}

.section{padding:1rem 0 2rem}
.section-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.2rem}
.stack{display:grid;gap:1.2rem}
.section-heading{margin-bottom:1rem}
.section-heading h2,.panel h2,.article-body h2,.related-articles h2{
  margin:0 0 .9rem;
  line-height:1.18;
  letter-spacing:-.03em
}

.panel,.toc-card,.article-card{
  background:linear-gradient(180deg,rgba(42,49,64,.96),rgba(30,36,48,.96));
  border:1px solid rgba(245,247,250,.07);
  border-radius:var(--radius);
  box-shadow:var(--shadow)
}
.panel{padding:1.5rem}
.clean-list{margin:0;padding-left:1.2rem}
.clean-list li+li{margin-top:.45rem}

.feature-card,.article-list-item,.pagination-link,.related-card{
  display:block;
  border-radius:var(--radius-small);
  border:1px solid rgba(245,247,250,.08);
  background:rgba(245,247,250,.03);
  padding:1rem 1.05rem;
  transition:transform .15s ease,border-color .15s ease,background .15s ease
}
.feature-card:hover,.article-list-item:hover,.pagination-link:hover,.related-card:hover{
  transform:translateY(-1px);
  border-color:rgba(224,122,47,.35);
  background:rgba(224,122,47,.06)
}
.feature-card{display:grid;gap:.35rem}
.feature-card strong,.related-card strong,.pagination-title{color:var(--white-soft);font-size:1.05rem}
.feature-meta,.related-series,.pagination-label{color:var(--text-muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.08em}
.article-list{display:grid;gap:.8rem}
.article-list-item{display:grid;grid-template-columns:70px 1fr;align-items:start;gap:.8rem}
.article-list-id{color:var(--accent-hover);font-weight:800}

/* Optional reusable inline link rows elsewhere on the site */
.link-row,
.inline-link-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
}
.link-row > a + a::before,
.inline-link-row > a + a::before{
  content:"|";
  color:var(--text-muted);
  margin:0 .75rem;
  font-weight:600;
}

.article-meta{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.35rem}
.article-meta span{
  color:var(--text-secondary);
  background:rgba(245,247,250,.04);
  border:1px solid rgba(245,247,250,.06);
  padding:.48rem .75rem;
  border-radius:999px;
  font-size:.88rem
}

.page-grid{
  display:grid;
  grid-template-columns:280px minmax(0,1fr);
  gap:1.5rem;
  align-items:start;
  padding-bottom:4rem
}
.toc-card{position:sticky;top:96px;padding:1.2rem}
.toc-heading{
  margin:0 0 1rem;
  color:var(--white-soft);
  font-weight:700;
  font-size:.92rem;
  text-transform:uppercase;
  letter-spacing:.08em
}
.toc-nav{display:grid;gap:.75rem}
.toc-nav a{color:var(--text-secondary);font-size:.95rem}
.toc-nav a:hover{color:var(--accent-hover)}

.article-card{overflow:hidden}
.article-body{padding:2rem clamp(1.2rem,2vw,2.4rem)}
.article-body section+section{margin-top:2.4rem}
.article-body h2,.article-body h3{scroll-margin-top:96px}
.article-body h3{margin:1.4rem 0 .7rem;font-size:1.16rem;color:var(--white-soft)}
.article-body p,.article-body li,.article-body td,.article-body th{font-size:1rem}
.article-body p{margin:0 0 1rem;color:var(--text)}
.article-body ul,.article-body ol{margin:0 0 1rem 1.3rem;padding:0}
.article-body li+li{margin-top:.45rem}
.article-body code:not(pre code){
  background:rgba(224,122,47,.12);
  color:#ffd9be;
  border:1px solid rgba(224,122,47,.2);
  padding:.12rem .38rem;
  border-radius:.4rem;
  font-size:.94em
}

pre{
  margin:1.2rem 0 0;
  background:var(--surface-2);
  color:#dce3f0;
  padding:1rem;
  border-radius:var(--radius-small);
  border:1px solid rgba(245,247,250,.06);
  overflow-x:auto;
  line-height:1.55
}

table{
  width:100%;
  border-collapse:collapse;
  margin-top:1rem;
  background:rgba(21,26,36,.55);
  border-radius:var(--radius-small);
  overflow:hidden;
  border:1px solid rgba(245,247,250,.08)
}
th,td{
  text-align:left;
  vertical-align:top;
  padding:.95rem 1rem;
  border-bottom:1px solid rgba(245,247,250,.07)
}
thead th{color:var(--white-soft);background:rgba(224,122,47,.08)}
tbody tr:last-child td{border-bottom:0}

.callout{
  margin:1.3rem 0;
  padding:1rem 1.1rem;
  border-radius:var(--radius-small);
  border-left:4px solid var(--accent);
  background:rgba(245,247,250,.04)
}
.callout.note{border-left-color:var(--accent-hover)}
.callout.warning{border-left-color:#ffb06b;background:rgba(224,122,47,.08)}
.callout.key-point{border-left-color:var(--accent);background:rgba(179,90,31,.14)}

.diagram-placeholder{
  min-height:220px;
  border-radius:var(--radius);
  border:1px dashed rgba(224,122,47,.45);
  background:linear-gradient(180deg,rgba(224,122,47,.06),rgba(224,122,47,.02)),rgba(21,26,36,.65);
  display:flex;
  align-items:center;
  justify-content:center;
  gap:1rem;
  padding:1.5rem
}
.diagram-chip{
  padding:1rem 1.2rem;
  border-radius:12px;
  background:var(--surface);
  border:1px solid rgba(245,247,250,.08);
  color:var(--white-soft);
  font-weight:700;
  min-width:88px;
  text-align:center
}
.diagram-bus{
  width:120px;
  height:4px;
  background:linear-gradient(90deg,var(--accent),var(--accent-hover));
  border-radius:999px;
  position:relative
}
.diagram-bus::before,.diagram-bus::after{
  content:"";
  position:absolute;
  top:-4px;
  width:12px;
  height:12px;
  border-radius:999px;
  background:var(--accent-hover)
}
.diagram-bus::before{left:0}
.diagram-bus::after{right:0}
.diagram-bus.short{width:70px}
.diagram-caption{color:var(--text-muted);font-size:.92rem;margin-top:.65rem}

.article-footer{
  border-top:1px solid rgba(245,247,250,.08);
  padding:1.6rem clamp(1.2rem,2vw,2.4rem) 2rem
}
.tags{display:flex;flex-wrap:wrap;gap:.6rem}
.tag{
  padding:.42rem .7rem;
  border-radius:999px;
  font-size:.84rem;
  color:var(--white-soft);
  background:rgba(224,122,47,.12);
  border:1px solid rgba(224,122,47,.2)
}
.article-pagination,.related-grid{display:grid;gap:1rem;margin-top:1.6rem}
.article-pagination{grid-template-columns:repeat(2,minmax(0,1fr))}
.related-grid{grid-template-columns:repeat(3,minmax(0,1fr))}

.site-footer{
  border-top:1px solid rgba(245,247,250,.07);
  padding:1rem 0 1.2rem;
  margin-top:1rem
}
.footer-inner{color:var(--text-muted);font-size:.94rem}
.footer-copy{margin:0}

@media (max-width:980px){
  .page-grid,.section-grid,.related-grid{grid-template-columns:1fr}
  .toc-card{position:static}
}