*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --paper: #f5f5f5;
  --paper-2: #ececec;
  --ink: #2d3142;
  --muted: #4f5d75;
  --soft: #7a8399;
  --accent: #eb6c36;
  --accent-tint: rgba(235,108,54,0.08);
  --link: #2e5aa8;
  --rule: rgba(45,49,66,0.12);
  --rule-solid: #bfc0c0;
  --zone-fill: rgba(45,49,66,0.02);
  --zone-stroke: rgba(45,49,66,0.10);
  --ext-fill: rgba(45,49,66,0.03);
  --ext-stroke: rgba(45,49,66,0.30);
  --store-fill: rgba(45,49,66,0.05);
  --input-fill: rgba(79,93,117,0.10);
  --input-stroke: #7a8399;
  --font-sans: 'Geist', 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-serif: Cambria, 'Times New Roman', 'Noto Serif', serif;
  --font-mono: 'Geist Mono', ui-monospace, 'SF Mono', 'Cascadia Mono', Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #2d3142;
    --paper-2: #393e53;
    --ink: #f5f5f5;
    --muted: #bfc0c0;
    --soft: #8e98ac;
    --accent: #f08a59;
    --accent-tint: rgba(240,138,89,0.10);
    --link: #6a95d8;
    --rule: rgba(245,245,245,0.12);
    --rule-solid: rgba(191,192,192,0.35);
    --zone-fill: rgba(245,245,245,0.02);
    --zone-stroke: rgba(245,245,245,0.10);
    --ext-fill: rgba(245,245,245,0.03);
    --ext-stroke: rgba(245,245,245,0.30);
    --store-fill: rgba(245,245,245,0.05);
    --input-fill: rgba(191,192,192,0.10);
    --input-stroke: #8e98ac;
  }
}

body {
  font-family: var(--font-sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.5;
  padding: 3rem 2rem 4rem;
}

.container { max-width: 1264px; margin: 0 auto; }

.header { margin-bottom: 2rem; }
.header-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.75rem;
}
h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3vw + 1rem, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 0.65rem;
}
.subtitle { font-size: 1rem; line-height: 1.55; color: var(--muted); max-width: 62ch; }
.badge {
  display: inline-block;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--soft);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 3px 7px;
  white-space: nowrap;
}

.diagram-container {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1.5rem;
  overflow-x: auto;
}
svg { display: block; width: 100%; min-width: 980px; height: auto; }

/* SVG */
.zone { fill: var(--zone-fill); stroke: var(--zone-stroke); stroke-width: 0.8; }
.zone-label { font-family: var(--font-mono); font-size: 8.5px; fill: var(--muted); letter-spacing: 0.08em; }
.node-mask { fill: var(--paper); }
.focal { fill: var(--accent-tint); stroke: var(--accent); stroke-width: 1.2; }
.input { fill: var(--input-fill); stroke: var(--input-stroke); stroke-width: 1; }
.external { fill: var(--ext-fill); stroke: var(--ext-stroke); stroke-width: 1; }
.store { fill: var(--store-fill); stroke: var(--muted); stroke-width: 1; }
.optional { fill: var(--ext-fill); stroke: var(--ext-stroke); stroke-width: 1; stroke-dasharray: 4,3; }
.chip { fill: none; stroke: var(--accent); stroke-opacity: 0.5; stroke-width: 0.8; }
.chip-text { font-family: var(--font-mono); font-size: 7px; fill: var(--accent); letter-spacing: 0.08em; }
.node-name { font-family: var(--font-sans); font-size: 12px; font-weight: 600; fill: var(--ink); }
.node-sub { font-family: var(--font-mono); font-size: 9px; fill: var(--muted); }
.hub-name { font-family: var(--font-sans); font-size: 14px; font-weight: 600; fill: var(--ink); }
.hub-sub { font-family: var(--font-mono); font-size: 9px; fill: var(--muted); }
.note { font-family: var(--font-sans); font-size: 8.5px; fill: var(--muted); }
.arrow-label { font-family: var(--font-mono); font-size: 8px; fill: var(--muted); letter-spacing: 0.06em; }
.arrow-label-link { font-family: var(--font-mono); font-size: 8px; fill: var(--link); letter-spacing: 0.06em; }
.arrow-label-vertical { font-family: var(--font-mono); font-size: 8px; fill: var(--muted); letter-spacing: 0.06em; }
.arrow-solid { stroke: var(--muted); stroke-width: 1.2; fill: none; }
.arrow-link { stroke: var(--link); stroke-width: 1.2; fill: none; }
.arrow-dashed { stroke: var(--muted); stroke-width: 1; fill: none; stroke-dasharray: 4,3; }
.arrow-link-dashed { stroke: var(--link); stroke-width: 1; fill: none; stroke-dasharray: 4,3; }
.marker-muted { fill: var(--muted); }
.marker-link { fill: var(--link); }
.rule-line { stroke: var(--rule); stroke-width: 0.8; }
.legend-text { font-family: var(--font-sans); font-size: 8.5px; fill: var(--muted); }
.legend-eyebrow { font-family: var(--font-mono); font-size: 8px; fill: var(--soft); letter-spacing: 0.14em; }

/* Callouts */
.callouts {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}
.callout {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--accent);
  border-radius: 6px;
  padding: 1.1rem 1.25rem;
}
.callout p { font-family: var(--font-serif); font-style: italic; font-size: 1.05rem; line-height: 1.35; color: var(--ink); }
.callout span { display: block; margin-top: 0.5rem; font-size: 0.8125rem; line-height: 1.5; color: var(--muted); }

/* Table */
.table-block { margin-top: 2.5rem; }
h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: 0.35rem;
}
.table-intro { font-size: 0.875rem; color: var(--muted); margin-bottom: 1rem; max-width: 68ch; }
.table-wrap { overflow-x: auto; border: 1px solid var(--rule); border-radius: 8px; background: var(--paper); }
table { border-collapse: collapse; width: 100%; min-width: 900px; font-size: 0.8125rem; }
caption { caption-side: top; text-align: left; padding: 0.75rem 1rem; font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--soft); border-bottom: 1px solid var(--rule); }
thead th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--rule-solid);
  white-space: nowrap;
}
tbody td { padding: 0.7rem 1rem; border-bottom: 1px solid var(--rule); vertical-align: top; line-height: 1.5; color: var(--muted); }
tbody th { padding: 0.7rem 1rem; border-bottom: 1px solid var(--rule); vertical-align: top; text-align: left; font-weight: 600; color: var(--ink); }
tbody tr:last-child td, tbody tr:last-child th { border-bottom: 0; }
col.c1 { width: 19%; } col.c2 { width: 44%; } col.c3 { width: 24%; } col.c4 { width: 13%; }
.status { display: inline-block; font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.06em; padding: 2px 6px; border-radius: 2px; white-space: nowrap; border: 1px solid var(--rule-solid); color: var(--muted); }
.status.now { color: var(--ink); }
.status.soon { border-style: dashed; }

.port-note {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.6;
  color: var(--soft);
}
.colophon {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: var(--soft);
}

@media (max-width: 860px) {
  body { padding: 2rem 1rem 3rem; }
  .callouts { grid-template-columns: 1fr; }
  .diagram-container { padding: 0.75rem; }
}
.back { display: inline-block; margin-bottom: 1.5rem; color: var(--link); text-decoration: none; font-size: 0.9rem; }
.back:hover { text-decoration: underline; }