:root {
  --bg: #f6f7f9; --surface: #ffffff; --text: #16191f; --muted: #5b6472;
  --border: #e1e4ea; --accent: #2457d6; --accent-soft: #e8eefc; --code: #eef0f4;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116; --surface: #161b22; --text: #e6e9ef; --muted: #9aa4b2;
    --border: #2a313c; --accent: #7aa2ff; --accent-soft: #1b2540; --code: #1d232c;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 1040px; margin: 0 auto; padding: 48px 16px 32px; }
h1 { font-size: clamp(2rem, 5vw, 2.8rem); line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.02em; }
h2 { font-size: 1.45rem; margin: 0 0 4px; letter-spacing: -0.01em; }
h3 { font-size: 1rem; margin: 0 0 4px; }
p { margin: 0; }
code, pre { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: 0.88em; }
code { background: var(--code); padding: 1px 5px; border-radius: 4px; }
section { margin-top: 56px; }
.sub { color: var(--muted); margin-bottom: 20px; }

.eyebrow { color: var(--accent); font-weight: 600; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 8px; }
.lede { font-size: 1.12rem; color: var(--muted); max-width: 760px; }
.lede strong { color: var(--text); }
.chips { list-style: none; padding: 0; margin: 20px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chips li { background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 4px 12px; font-size: 0.85rem; font-weight: 600; }

.flow { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; counter-reset: none; }
.flow li {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 16px 14px 14px;
}
.flow li:not(:last-child)::after {
  content: "\2192"; position: absolute; right: -11px; top: 22px; color: var(--accent); font-weight: 700;
}
.flow p { color: var(--muted); font-size: 0.86rem; line-height: 1.5; }
.n {
  display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: var(--surface); font-size: 0.8rem; font-weight: 700; margin-bottom: 8px;
}
.flow-alt .n { background: var(--text); }

.arch { margin: 16px 0 0; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 12px; overflow-x: auto; }
.arch svg { display: block; width: 100%; min-width: 620px; height: auto; }
.zone { fill: var(--accent-soft); stroke: var(--accent); stroke-dasharray: 5 5; }
.zone-label { fill: var(--accent); font: 600 12px system-ui, sans-serif; }
.box { fill: var(--surface); stroke: var(--border); stroke-width: 1.5; }
.box.hi { stroke: var(--accent); }
.t { fill: var(--text); font: 600 13px system-ui, sans-serif; text-anchor: middle; }
.s { fill: var(--muted); font: 11px system-ui, sans-serif; text-anchor: middle; }
.ln { stroke: var(--muted); stroke-width: 1.6; fill: none; }
.ln.dash { stroke-dasharray: 4 4; }
.arrowhead { fill: var(--muted); }

.table { overflow-x: auto; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: 0.92rem; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; }
tr:last-child td { border-bottom: 0; }
pre { background: var(--code); border-radius: 10px; padding: 14px 16px; overflow-x: auto; margin: 16px 0 0; }
pre code { background: none; padding: 0; }

.grid { list-style: none; padding: 0; margin: 16px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.grid li { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.grid p { color: var(--muted); font-size: 0.9rem; }

footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem; }

@media (max-width: 900px) {
  .flow { grid-template-columns: repeat(3, 1fr); }
  .flow li:nth-child(3)::after { content: none; }
  .grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  main { padding-top: 32px; }
  .flow, .grid { grid-template-columns: 1fr; }
  .flow li::after { content: none !important; }
}