:root{
  --bg:#F8F7F4;
  --surface:#ffffff;
  --surface-alt:#ffffff;
  --text:#1a1a2e;
  --muted:#4a4a68;
  --soft:#7a7a96;
  --line:#e8e6e1;
  --blue:#292663;
  --green:#16a34a;
  --amber:#FBB04C;
  --purple:#92278F;
  --danger:#EC008C;
  --shadow:0 4px 16px rgba(41,38,99,0.06);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter','Segoe UI',system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
}

a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}

.site-nav{
  position:sticky;
  top:0;
  z-index:100;
  display:flex;
  align-items:center;
  gap:0.25rem;
  padding:0.75rem 2rem;
  background:rgba(248,247,244,0.92);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  font-size:0.9rem;
  font-weight:500;
}

.site-nav a{
  color:var(--muted);
  text-decoration:none;
  padding:0.4rem 0.75rem;
  border-radius:6px;
  transition:all 0.2s;
}

.site-nav a:hover{color:var(--blue);background:rgba(41,38,99,0.08)}
.site-nav a.active{color:var(--blue);font-weight:700}

.breadcrumb{
  max-width:1360px;
  margin:0 auto;
  padding:1rem 2rem 0;
  font-size:0.85rem;
}

.page-layout{
  display:flex;
  max-width:1360px;
  margin:0 auto;
  padding:1.5rem 2rem 3rem;
  gap:2rem;
}

.side-nav{
  width:250px;
  flex-shrink:0;
  position:sticky;
  top:74px;
  align-self:flex-start;
  max-height:calc(100vh - 94px);
  overflow-y:auto;
}

.side-nav h4{
  font-size:0.72rem;
  text-transform:uppercase;
  letter-spacing:0.1em;
  color:var(--soft);
  margin-bottom:0.75rem;
  font-weight:600;
}

.side-nav a{
  display:block;
  padding:0.45rem 0.8rem;
  margin-bottom:0.15rem;
  font-size:0.85rem;
  color:var(--muted);
  text-decoration:none;
  border-radius:6px;
  border-left:3px solid transparent;
  transition:all 0.15s;
}

.side-nav a:hover,
.side-nav a.sn-active{
  color:var(--blue);
  background:rgba(41,38,99,0.06);
  border-left-color:var(--blue);
}

.main-content{flex:1;min-width:0}

.hero-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:20px;
  padding:2rem;
  box-shadow:var(--shadow);
  margin-bottom:1.5rem;
}

.status-pill{
  display:inline-block;
  margin-bottom:1rem;
  padding:0.3rem 0.85rem;
  border-radius:999px;
  background:rgba(0,214,143,0.12);
  color:#008a5d;
  font-size:0.78rem;
  font-family:'JetBrains Mono','IBM Plex Mono','Menlo',monospace;
  font-weight:600;
}

.hero-card h1{
  font-size:2.25rem;
  line-height:1.1;
  margin-bottom:0.45rem;
  font-weight:700;
}

.hero-card h1 span{color:var(--blue)}
.hero-card p{color:var(--muted);max-width:920px}

.summary-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(160px,1fr));
  gap:1rem;
  margin-top:1.35rem;
}

.summary-item{
  background:var(--surface-alt);
  border:1px solid var(--line);
  border-radius:14px;
  padding:1rem;
}

.summary-item .label{
  color:var(--soft);
  font-size:0.72rem;
  text-transform:uppercase;
  letter-spacing:0.08em;
  margin-bottom:0.35rem;
}

.summary-item .value{
  font-size:1.15rem;
  font-weight:700;
}

.content-section{
  margin-bottom:2rem;
  scroll-margin-top:90px;
}

.section-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  margin-bottom:0.9rem;
}

.section-header h2{
  font-size:1.45rem;
  font-weight:700;
}

.section-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:18px;
  padding:1.25rem;
  box-shadow:var(--shadow);
}

.section-card + .section-card{margin-top:1rem}

.section-intro{margin-bottom:1rem;color:var(--muted)}
.small-note{font-size:0.85rem;color:var(--soft)}

.mono{font-family:'JetBrains Mono','IBM Plex Mono','Menlo',monospace}
.ac{
  display:inline-block;
  padding:0.12rem 0.48rem;
  border-radius:4px;
  background:rgba(255,184,0,0.18);
  color:#946200;
  font-size:0.72rem;
  font-weight:700;
  font-family:'JetBrains Mono','IBM Plex Mono','Menlo',monospace;
}

.hp{
  display:inline-block;
  padding:0.12rem 0.48rem;
  border-radius:4px;
  border:1px solid rgba(41,38,99,0.3);
  background:rgba(41,38,99,0.08);
  color:#292663;
  font-size:0.72rem;
  font-weight:700;
  font-family:'JetBrains Mono','IBM Plex Mono','Menlo',monospace;
}

.pill{
  display:inline-block;
  padding:0.14rem 0.55rem;
  border-radius:999px;
  font-size:0.76rem;
  font-weight:700;
  font-family:'JetBrains Mono','IBM Plex Mono','Menlo',monospace;
}

.pill-blue{background:rgba(41,38,99,0.12);color:#292663}
.pill-green{background:rgba(0,214,143,0.12);color:#008a5d}
.pill-amber{background:rgba(255,184,0,0.16);color:#946200}

.spec-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:1rem;
}

.diagram-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(320px,1fr));
  gap:1rem;
}

.compare-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:1rem;
}

.diagram-card{
  background:var(--surface-alt);
  border:1px solid var(--line);
  border-radius:16px;
  padding:1rem;
}

.compare-card{
  background:var(--surface-alt);
  border:1px solid var(--line);
  border-radius:16px;
  padding:1rem;
}

.compare-card h3{
  font-size:1rem;
  font-weight:700;
  margin-bottom:0.25rem;
}

.compare-card p{
  font-size:0.88rem;
  color:var(--muted);
  margin-bottom:0.75rem;
}

.diagram-card h3{
  font-size:1rem;
  font-weight:700;
  margin-bottom:0.25rem;
}

.diagram-card p{
  font-size:0.88rem;
  color:var(--muted);
  margin-bottom:0.85rem;
}

.svg-wrap{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:14px;
  padding:0.75rem;
  overflow:auto;
}

.svg-wrap svg{
  display:block;
  width:100%;
  height:auto;
  background:#ffffff;
}

svg text{
  font-family:'Inter','Segoe UI',system-ui,-apple-system,sans-serif;
  font-size:12px;
  fill:var(--text);
}

svg [font-size="3"], svg [font-size^="3."],
svg [font-size="4"], svg [font-size^="4."],
svg [font-size="5"], svg [font-size^="5."],
svg [font-size="6"], svg [font-size^="6."],
svg [font-size="7"], svg [font-size^="7."],
svg [font-size="8"], svg [font-size^="8."] { font-size:9px; }

svg [font-size="9"], svg [font-size^="9."],
svg [font-size="10"], svg [font-size^="10."] { font-size:11px; }

svg .mono{
  font-family:'JetBrains Mono','IBM Plex Mono','Menlo',monospace;
}

svg .label{
  font-size:12px;
  font-weight:600;
}

svg .sub-label{
  font-size:11px;
  fill:var(--muted);
}

svg .dim-line{
  stroke:var(--purple);
  stroke-width:2;
  fill:none;
}

svg .dim-text{
  fill:var(--purple);
  font-size:12px;
  font-weight:700;
}

svg .detail-outline{
  stroke:#334155;
  stroke-width:2;
  fill:none;
}

svg .guide{
  stroke:#cbd5e1;
  stroke-width:1.5;
  fill:none;
  stroke-dasharray:8 6;
}

svg .danger{
  stroke:var(--danger);
  stroke-width:2;
  fill:none;
  stroke-dasharray:8 6;
}

svg .ac-box{
  fill:#ffb800;
  stroke:#d19a00;
  stroke-width:1;
}

svg .ac-text{
  fill:#1a1a2e;
  font-size:11px;
  font-weight:700;
}

svg .dim-red-line{
  stroke:#EC008C;
  stroke-width:2;
  fill:none;
}

svg .dim-red-text{
  fill:#EC008C;
  font-size:11px;
  font-weight:700;
  font-family:'JetBrains Mono','IBM Plex Mono','Menlo',monospace;
}

svg .backing-rod{
  fill:#9ca3af;
  stroke:#475569;
  stroke-width:1.5;
}

svg .sealant{
  fill:#111827;
}

svg .good-mark{
  fill:#15803d;
  font-weight:700;
}

svg .bad-mark{
  fill:#EC008C;
  font-weight:700;
}

.legend{
  display:flex;
  flex-wrap:wrap;
  gap:0.55rem;
  margin-top:0.9rem;
}

.legend span{
  display:inline-flex;
  align-items:center;
  gap:0.35rem;
  background:var(--surface-alt);
  border:1px solid var(--line);
  border-radius:999px;
  padding:0.28rem 0.7rem;
  font-size:0.8rem;
  color:var(--muted);
}

.swatch{
  width:12px;
  height:12px;
  border-radius:3px;
  border:1px solid rgba(41,38,99,0.18);
}

.note-box,
.warning-box{
  border-radius:14px;
  padding:1rem 1.1rem;
  font-size:0.9rem;
}

.note-box{
  background:rgba(41,38,99,0.08);
  border:1px solid rgba(41,38,99,0.2);
  color:#292663;
}

.warning-box{
  background:rgba(255,184,0,0.12);
  border:1px solid rgba(255,184,0,0.28);
  color:#7a5600;
}

.good-box{
  background:rgba(0,214,143,0.12);
  border:1px solid rgba(0,214,143,0.26);
  color:#0b7b54;
}

.bad-box{
  background:rgba(239,68,68,0.08);
  border:1px solid rgba(239,68,68,0.22);
  color:#991b1b;
}

.callout-list{
  list-style:none;
  padding:0;
  margin:0;
}

.callout-list li{
  padding:0.7rem 0.8rem;
  border-bottom:1px solid #f0eeea;
  color:var(--muted);
  font-size:0.9rem;
}

.callout-list li:last-child{border-bottom:none}

.bullet-list{padding-left:1.2rem;color:var(--muted)}
.bullet-list li{margin-bottom:0.45rem}

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

.data-table th{
  text-align:left;
  padding:0.75rem 0.85rem;
  font-size:0.76rem;
  text-transform:uppercase;
  letter-spacing:0.06em;
  color:var(--soft);
  background:#f5f4f0;
  border-bottom:1px solid var(--line);
}

.data-table td{
  padding:0.72rem 0.85rem;
  font-size:0.9rem;
  border-bottom:1px solid #f0eeea;
  vertical-align:top;
}

.data-table tr:last-child td{border-bottom:none}

.footer{
  max-width:1360px;
  margin:0 auto;
  padding:1.5rem 2rem 2.5rem;
  border-top:1px solid var(--line);
  text-align:center;
  color:var(--soft);
  font-family:'JetBrains Mono','IBM Plex Mono','Menlo',monospace;
  font-size:0.8rem;
}

@media(max-width:960px){
  .page-layout{flex-direction:column;padding:1rem}
  .side-nav{
    width:100%;
    position:static;
    max-height:none;
    display:flex;
    flex-wrap:wrap;
    gap:0.25rem;
  }
  .side-nav h4{width:100%}
  .side-nav a{border-left:none;border-bottom:2px solid transparent}
  .hero-card h1{font-size:1.8rem}
}

@media(max-width:720px){
  .site-nav{flex-wrap:wrap;padding:0.65rem 1rem}
  .site-nav a{padding:0.28rem 0.5rem;font-size:0.8rem}
  .breadcrumb{padding:0.85rem 1rem 0}
  .page-layout{padding:1rem}
  .hero-card{padding:1.35rem}
  .diagram-grid,.spec-grid,.summary-grid{grid-template-columns:1fr}
}