/* ============================================================
   agent-center documentation site — "Engineering Blueprint"
   design system. Pure static, hand-written, flat (no gradients).

   Aesthetic: drafting-paper canvas + faint coordinate grid,
   monospace labels, hairline rules, cyan/amber signal accents,
   dark schematic panels for hero & code. Light by default,
   full dark schematic via prefers-color-scheme: dark.

   Token NAMES are kept stable so per-page inline <style> blocks
   keep working; only their values + the component rules changed.
   ============================================================ */

:root {
  /* ---- surfaces & ink (light: drafting paper) ---- */
  --paper:        #eef1ea;          /* page canvas            */
  --bg:           var(--paper);
  --surface:      #ffffff;          /* panels / cards         */
  --surface-2:    #f4f7f0;          /* insets / code-inline   */
  --border:       #d2d8cb;          /* hairline rule          */
  --border-strong:#b4bdab;
  --grid-line:    rgba(20,52,68,.045);

  --ink:          #14181d;
  --ink-soft:     #434b53;
  --ink-mute:     #6a7480;
  --ink-faint:    #98a2af;

  /* ---- signal accents (flat) ---- */
  --primary:      #0b6e7d;          /* teal-cyan (was blue)   */
  --primary-deep: #0a5560;
  --accent:       #c2410c;          /* amber-rust             */
  --cyan:         #0e7c8e;
  --amber:        #b45309;

  /* dark schematic panels embedded in the light page */
  --panel:        #0d1117;          /* hero / pre background  */
  --panel-2:      #161c24;          /* header bars            */
  --panel-ink:    #c8d3de;
  --panel-soft:   #8e9bab;
  --panel-line:   rgba(120,190,210,.16);
  --panel-cyan:   #34d0e6;
  --panel-amber:  #f4b740;

  /* legacy alias kept for safety (no longer a gradient) */
  --hero:         var(--panel);

  /* ---- state pills / callouts ---- */
  --blue-bg:  #e2f3f6; --blue-fg:  #0b6e7d;
  --green-bg: #e6f4ea; --green-fg: #1b7d34;
  --purple-bg:#eef0fb; --purple-fg:#5b4bb0; --purple-bd:#dadcf3;
  --amber-bg: #fdf0e3; --amber-fg: #c2410c;

  /* ---- DDD semantic colors (carry meaning — kept) ---- */
  --core: #d63a3a;  --core-2: #e03131;
  --support: #0b6e7d;
  --generic: #7a838f;
  --ar:  #d9610f;   /* aggregate root */
  --vo:  #7b62e0;   /* value object   */
  --repo:#c79100;   /* repository     */

  /* ---- geometry: blueprint = sharp corners ---- */
  --r-sm: 2px; --r-md: 3px; --r-lg: 4px; --r-pill: 999px;
  --shadow:    3px 3px 0 -1px rgba(11,110,125,.07);
  --shadow-hi: 5px 5px 0 -1px rgba(11,110,125,.16);

  --w: 900px;
  --w-wide: 1100px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", "JetBrains Mono",
          Menlo, Consolas, monospace;
}

/* ============================================================
   DARK — full near-black schematic
   ============================================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --paper:        #0b0e12;
    --surface:      #11161d;
    --surface-2:    #161c25;
    --border:       #232c37;
    --border-strong:#33404e;
    --grid-line:    rgba(120,190,210,.055);

    --ink:          #d6dee7;
    --ink-soft:     #aab4bf;
    --ink-mute:     #78828f;
    --ink-faint:    #586470;

    --primary:      #2bc4da;
    --primary-deep: #0e7c8e;
    --accent:       #f59e0b;
    --cyan:         #2bc4da;
    --amber:        #f0a93a;

    --panel:        #070a0e;
    --panel-2:      #0e131a;
    --panel-ink:    #c8d3de;
    --panel-soft:   #7d8a9a;
    --panel-line:   rgba(120,190,210,.16);

    --blue-bg:  #0d2a30; --blue-fg:  #45cfe2;
    --green-bg: #102a18; --green-fg: #5dd07e;
    --purple-bg:#1c1a33; --purple-fg:#a99cf0; --purple-bd:#332e55;
    --amber-bg: #2c1c0c; --amber-fg: #f0a93a;

    --core: #ff6b6b; --core-2: #ff5252;
    --support: #2bc4da;
    --generic: #8893a0;
    --ar:  #ff9d4d;
    --vo:  #a99cf0;
    --repo:#ffd34d;

    --shadow:    3px 3px 0 -1px rgba(43,196,218,.12);
    --shadow-hi: 5px 5px 0 -1px rgba(43,196,218,.28);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; padding: 0;
  font-family: var(--font);
  color: var(--ink);
  background-color: var(--bg);
  /* faint coordinate grid — the drafting surface */
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 26px 26px;
  background-position: -1px -1px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--primary); color: #fff; }

/* ---------- top navigation (shared header) ---------- */
.site-hd {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(140%) blur(9px);
  border-bottom: 1px solid var(--border);
}
.hd-inner {
  max-width: var(--w-wide); margin: 0 auto;
  display: flex; align-items: center; gap: 18px;
  padding: 12px 24px;
}
.brand {
  font-family: var(--mono);
  font-weight: 700; font-size: 15px; color: var(--ink);
  text-decoration: none; letter-spacing: .2px; white-space: nowrap;
  display: inline-flex; align-items: center;
}
.brand::before {
  content: "›_"; color: var(--primary);
  margin-right: 7px; font-weight: 700;
}
.brand .dot { color: var(--accent); }
.hd-nav { margin-left: auto; display: flex; align-items: center; gap: 2px; flex-wrap: wrap; }
.hd-nav a {
  font-family: var(--mono);
  text-decoration: none; color: var(--ink-soft); font-size: 13px;
  padding: 6px 11px; border-radius: var(--r-sm);
  border: 1px solid transparent;
  transition: background .12s, color .12s, border-color .12s;
}
.hd-nav a:hover { background: var(--surface-2); color: var(--primary); }
.hd-nav a.active { color: var(--primary); border-color: var(--border); background: var(--surface-2); }
.hd-nav a.gh { border: 1px solid var(--border); color: var(--ink); display: inline-flex; align-items: center; justify-content: center; padding: 6px 9px; }
.hd-nav a.gh svg { display: block; width: 17px; height: 17px; }
.hd-nav a.gh:hover { border-color: var(--primary); color: var(--primary); }

/* ---------- hero = dark schematic panel ---------- */
.hero {
  position: relative; overflow: hidden;
  background: var(--panel); color: var(--panel-ink);
  padding: 66px 24px 60px;
  border-bottom: 1px solid var(--border);
}
.hero.sm { padding: 46px 24px 42px; }
/* blueprint grid inside the hero */
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--panel-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--panel-line) 1px, transparent 1px);
  background-size: 30px 30px;
  -webkit-mask-image: radial-gradient(120% 120% at 88% 0%, #000 0%, transparent 72%);
          mask-image: radial-gradient(120% 120% at 88% 0%, #000 0%, transparent 72%);
}
/* crosshair tick, top-right */
.hero::after {
  content: ""; position: absolute; top: 22px; right: 26px;
  width: 16px; height: 16px; pointer-events: none;
  background:
    linear-gradient(var(--panel-cyan), var(--panel-cyan)) center/1px 100% no-repeat,
    linear-gradient(var(--panel-cyan), var(--panel-cyan)) center/100% 1px no-repeat;
  opacity: .55;
}
.hero .inner { position: relative; max-width: var(--w-wide); margin: 0 auto; }
.hero .eyebrow {
  font-family: var(--mono);
  display: inline-block; font-size: 12px; letter-spacing: .4px;
  color: var(--panel-cyan); margin: 0 0 16px;
  border: 1px solid var(--panel-line);
  background: rgba(52,208,230,.07);
  padding: 4px 11px; border-radius: var(--r-sm);
}
.hero .eyebrow::before { content: ">_ "; opacity: .8; }
.hero h1 {
  margin: 0 0 14px; font-size: 38px; font-weight: 800;
  letter-spacing: -.5px; line-height: 1.16; color: #fff;
}
.hero.sm h1 { font-size: 28px; }
.hero p.lede {
  margin: 0; font-size: 17px; color: var(--panel-soft);
  max-width: 720px; line-height: 1.7;
}
/* inline server─worker wiring diagram (used on home hero) */
.hero .wires {
  font-family: var(--mono); font-size: 12.5px; color: var(--panel-soft);
  margin: 24px 0 0; padding: 13px 0 0;
  border-top: 1px dashed var(--panel-line);
  display: flex; flex-wrap: wrap; align-items: center; gap: 9px;
}
.hero .wires .w-node {
  color: var(--panel-cyan); font-weight: 600;
  border: 1px solid var(--panel-line); border-radius: var(--r-sm);
  padding: 2px 9px; background: rgba(52,208,230,.06);
}
.hero .wires .w-node.ok { color: var(--panel-amber); background: rgba(244,183,64,.06); }
.hero .wires .w-link { color: var(--panel-soft); opacity: .65; letter-spacing: 1px; }
.hero .wires .w-tag { color: var(--panel-soft); }
.hero .wires .w-tag b { color: var(--panel-cyan); font-weight: 600; }

.hero .cta { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  font-family: var(--mono);
  text-decoration: none; font-size: 13.5px; font-weight: 600;
  padding: 11px 18px; border-radius: var(--r-sm);
  border: 1px solid transparent;
  transition: transform .12s, box-shadow .12s, background .12s, color .12s;
}
.btn.primary {
  background: var(--panel-cyan); color: #042027;
  box-shadow: 4px 4px 0 -1px rgba(52,208,230,.3);
}
.btn.ghost { color: var(--panel-ink); border-color: var(--panel-line); }
.btn.ghost:hover { border-color: var(--panel-cyan); color: var(--panel-cyan); }
.btn:hover { transform: translate(-1px,-2px); }
.btn.primary:hover { box-shadow: 5px 6px 0 -1px rgba(52,208,230,.4); }

/* ---------- layout ---------- */
.wrap { max-width: var(--w); margin: 0 auto; padding: 0 24px; }
.wrap.wide { max-width: var(--w-wide); }
.pull-up { margin-top: -28px; }
.section-title {
  font-family: var(--mono);
  font-size: 12px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--ink-mute); margin: 44px 4px 16px; font-weight: 600;
}
.section-title::before { content: "// "; color: var(--primary); }
.lead { font-size: 16px; color: var(--ink-soft); margin: 8px 4px 24px; }

/* breadcrumb */
.crumb {
  max-width: var(--w-wide); margin: 0 auto;
  padding: 16px 24px 0; font-family: var(--mono);
  font-size: 12.5px; color: var(--ink-mute);
}
.crumb a { color: var(--primary); text-decoration: none; }
.crumb a:hover { text-decoration: underline; }

/* ---------- cards / grid ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.grid.two { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }
.card {
  position: relative; display: block; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: 22px 22px 20px; box-shadow: var(--shadow);
  transition: transform .14s ease, box-shadow .14s ease, border-color .14s ease;
}
/* corner registration ticks */
.card::before, .card::after {
  content: ""; position: absolute; width: 9px; height: 9px; pointer-events: none;
  opacity: 0; transition: opacity .14s ease;
}
.card::before { top: 7px; left: 7px; border-top: 1.5px solid var(--primary); border-left: 1.5px solid var(--primary); }
.card::after  { bottom: 7px; right: 7px; border-bottom: 1.5px solid var(--primary); border-right: 1.5px solid var(--primary); }
a.card:hover {
  transform: translate(-1px,-2px);
  box-shadow: var(--shadow-hi); border-color: var(--primary);
}
a.card:hover::before, a.card:hover::after { opacity: 1; }
.card h3 { margin: 0 0 8px; font-size: 18px; letter-spacing: -.2px; }
.card .ver { display: inline-block; font-family: var(--mono); font-weight: 700; font-size: 20px; color: var(--primary); }
.card .desc { margin: 10px 0 14px; font-size: 14px; color: var(--ink-soft); }
.card .ico {
  font-size: 18px; margin-bottom: 12px;
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border: 1px solid var(--border);
  border-radius: var(--r-sm); background: var(--surface-2);
}
/* mono index label, e.g. <span class="idx">01</span> */
.card .idx {
  position: absolute; top: 18px; right: 20px;
  font-family: var(--mono); font-size: 12px; font-weight: 600;
  color: var(--ink-faint); letter-spacing: 1px;
}

/* badges & tags */
.badge {
  float: right; font-family: var(--mono); font-size: 11px; font-weight: 600;
  padding: 3px 9px; border-radius: var(--r-sm);
  background: var(--blue-bg); color: var(--blue-fg);
  border: 1px solid color-mix(in srgb, var(--blue-fg) 25%, transparent);
}
.badge.current { background: var(--green-bg); color: var(--green-fg); border-color: color-mix(in srgb, var(--green-fg) 25%, transparent); }
.badge.hist { background: var(--surface-2); color: var(--ink-mute); border-color: var(--border); }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-family: var(--mono); font-size: 11px; padding: 2px 8px; border-radius: var(--r-sm);
  background: var(--purple-bg); color: var(--purple-fg); border: 1px solid var(--purple-bd);
}

/* feature list */
.features { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 16px; margin: 8px 0; }
.feature {
  position: relative;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: 18px 18px 16px; box-shadow: var(--shadow);
  border-left: 3px solid var(--primary);
}
.feature h4 { margin: 0 0 6px; font-size: 15px; color: var(--primary); }
.feature p { margin: 0; font-size: 14px; color: var(--ink-soft); }

/* ---------- prose ---------- */
.prose {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: 8px 30px 26px; box-shadow: var(--shadow);
}
.prose h2 {
  font-size: 21px; margin: 30px 0 12px; padding-top: 8px;
  letter-spacing: -.3px;
}
.prose h2::before {
  content: "§ "; font-family: var(--mono); color: var(--primary);
  font-size: 16px; font-weight: 600; opacity: .8;
}
.prose h3 { font-family: var(--mono); font-size: 15px; margin: 24px 0 8px; color: var(--primary); }
.prose p, .prose li { font-size: 15px; color: var(--ink-soft); }
.prose ul, .prose ol { padding-left: 22px; }
.prose li::marker { color: var(--primary); }
.prose a { color: var(--primary); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--primary) 35%, transparent); }
.prose a:hover { border-bottom-color: var(--primary); }
.prose code {
  font-family: var(--mono); font-size: 13px;
  background: var(--surface-2); color: var(--accent);
  padding: 1px 6px; border-radius: var(--r-sm);
  border: 1px solid var(--border);
}
/* code block = terminal panel with dot header */
.prose pre {
  position: relative; background: var(--panel); color: var(--panel-ink);
  border: 1px solid var(--border-strong); border-radius: var(--r-md);
  padding: 38px 18px 16px; margin: 16px 0; overflow-x: auto;
  font-family: var(--mono); font-size: 13px; line-height: 1.6;
}
.prose pre::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 26px;
  background: var(--panel-2); border-bottom: 1px solid var(--panel-line);
  border-radius: var(--r-md) var(--r-md) 0 0;
}
.prose pre::after {
  content: "\25CF \25CF \25CF"; position: absolute; top: 4px; left: 13px;
  font-size: 9px; letter-spacing: 4px; color: var(--panel-soft); opacity: .7;
}
.prose pre code { background: none; color: inherit; padding: 0; border: 0; }
.prose table { border-collapse: collapse; width: 100%; margin: 14px 0; font-size: 14px; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; vertical-align: top; }
.prose th { background: var(--surface-2); font-family: var(--mono); font-weight: 600; font-size: 13px; }
.prose blockquote {
  margin: 14px 0; padding: 10px 16px; border-left: 3px solid var(--primary);
  background: var(--surface-2); border-radius: 0 var(--r-sm) var(--r-sm) 0; color: var(--ink-soft);
}

/* callout note box */
.callout {
  position: relative; border-radius: var(--r-md); padding: 14px 16px 14px 18px;
  margin: 16px 0; font-size: 14px; border: 1px solid var(--border);
  background: var(--surface); border-left: 3px solid var(--ink-mute);
}
.callout.info { background: var(--blue-bg); border-color: color-mix(in srgb, var(--blue-fg) 30%, transparent); border-left-color: var(--blue-fg); }
.callout.warn { background: var(--amber-bg); border-color: color-mix(in srgb, var(--amber-fg) 30%, transparent); border-left-color: var(--amber-fg); color: var(--amber-fg); }
.callout.warn b { color: inherit; }
.callout b { color: inherit; }

/* ---------- version switch (dev guide) ---------- */
.verswitch {
  display: inline-flex; gap: 3px; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: var(--r-sm); padding: 3px; margin: 4px 0 8px;
}
.verswitch a {
  font-family: var(--mono); text-decoration: none; font-size: 13px; font-weight: 600;
  color: var(--ink-soft); padding: 5px 14px; border-radius: var(--r-sm);
}
.verswitch a.on { background: var(--primary); color: #fff; }

/* ---------- footer ---------- */
.foot {
  max-width: var(--w-wide); margin: 48px auto 0; padding: 36px 24px 48px;
  color: var(--ink-faint); font-family: var(--mono); font-size: 12.5px;
  border-top: 1px solid var(--border);
}
.foot a { color: var(--primary); text-decoration: none; }
.foot a:hover { text-decoration: underline; }
.foot code { font-family: var(--mono); font-size: 12px; }

/* ============================================================
   DDD diagram primitives — reframed as blueprint blocks
   plain HTML+CSS — no SVG / mermaid
   ============================================================ */
.legend { display: flex; flex-wrap: wrap; gap: 14px; margin: 10px 0 20px; font-family: var(--mono); font-size: 12px; color: var(--ink-soft); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 13px; height: 13px; border-radius: 2px; display: inline-block; border: 1px solid rgba(0,0,0,.12); }

.tabbar { display: flex; gap: 4px; flex-wrap: wrap; margin: 8px 0 18px; border-bottom: 1px solid var(--border); }
.tabbar button {
  background: none; border: none; font-family: var(--mono);
  font-size: 13.5px; font-weight: 600; color: var(--ink-mute);
  padding: 10px 14px; cursor: pointer; border-bottom: 2px solid transparent;
}
.tabbar button:hover { color: var(--primary); }
.tabbar button.on { color: var(--primary); border-bottom-color: var(--primary); }
.tabpane { display: none; }
.tabpane.on { display: block; }

/* context map — flat blocks with semantic edge */
.ctx-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: stretch; margin: 10px 0; }
.ctx {
  flex: 1 1 200px; min-width: 180px; border-radius: var(--r-md); padding: 14px;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--border); border-top: 3px solid var(--generic);
  box-shadow: var(--shadow);
}
.ctx.core    { border-top-color: var(--core); }
.ctx.support { border-top-color: var(--support); }
.ctx.generic { border-top-color: var(--generic); }
.ctx h4 { margin: 0 0 4px; font-size: 15px; font-family: var(--mono); }
.ctx.core h4    { color: var(--core); }
.ctx.support h4 { color: var(--support); }
.ctx.generic h4 { color: var(--generic); }
.ctx .sub { font-size: 12px; color: var(--ink-mute); }
.ctx ul { margin: 8px 0 0; padding-left: 16px; font-size: 12px; color: var(--ink-soft); }
.arrows-row, .arch-conn { text-align: center; color: var(--ink-mute); font-family: var(--mono); font-size: 13px; margin: 6px 0; }

/* tactical aggregates */
.bc-block { border: 1px solid var(--border); border-radius: var(--r-md); padding: 16px; margin: 14px 0; background: var(--surface); box-shadow: var(--shadow); }
.bc-block > h4 { margin: 0 0 10px; font-size: 15px; font-family: var(--mono); color: var(--primary); }
.agg { border: 1px solid var(--ar); border-left: 4px solid var(--ar); border-radius: var(--r-md); padding: 12px 14px; margin: 10px 0; background: var(--surface-2); }
.agg .agg-h { font-weight: 700; font-family: var(--mono); color: var(--ar); font-size: 14px; }
.agg .tag.ar     { background: color-mix(in srgb, var(--ar) 12%, var(--surface)); color: var(--ar); border-color: color-mix(in srgb, var(--ar) 35%, transparent); }
.agg .tag.vo     { background: color-mix(in srgb, var(--vo) 12%, var(--surface)); color: var(--vo); border-color: color-mix(in srgb, var(--vo) 35%, transparent); }
.agg .tag.entity { background: color-mix(in srgb, var(--support) 12%, var(--surface)); color: var(--support); border-color: color-mix(in srgb, var(--support) 35%, transparent); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.chip { font-family: var(--mono); font-size: 11px; padding: 2px 9px; border-radius: var(--r-sm); background: var(--surface-2); color: var(--ink-soft); border: 1px solid var(--border); }
.chip.state { background: var(--green-bg); color: var(--green-fg); border-color: color-mix(in srgb, var(--green-fg) 30%, transparent); }
.svc { border-left: 3px solid var(--support); background: var(--surface-2); padding: 8px 12px; border-radius: 0 var(--r-sm) var(--r-sm) 0; margin: 8px 0; font-size: 13px; }

/* event storming — sticky-note chips (kept legible on both themes) */
.es-flow { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 10px 0; }
.es { font-family: var(--mono); font-size: 12px; padding: 6px 10px; border-radius: var(--r-sm); white-space: nowrap; border: 1px solid rgba(0,0,0,.08); }
.es.cmd    { background: #cfe9ff; color: #0b4e7d; }
.es.event  { background: #ffe89a; color: #7a5a00; }
.es.actor  { background: #ffd9a8; color: #8a4b08; }
.es.policy { background: #e4d4fb; color: #5b3fb0; }
.es.ar     { background: #ffe0bf; color: #c2410c; }
.es-arrow { color: var(--ink-mute); font-family: var(--mono); }

/* tactical-design helpers (shared by dev tactical pages) */
.agg-fields { font-family: var(--mono); font-size: 12px; color: var(--ink-soft); margin: 6px 0 8px; line-height: 1.5; }
.agg-sub { font-size: 12px; color: var(--ink-soft); margin: 4px 0 6px; }
.smrow { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 8px 0; font-size: 12px; }
.smrow .lbl { color: var(--ink-mute); }
.smarrow { color: var(--accent); font-weight: 700; }
.chip.term { background: var(--surface-2); color: var(--ink-mute); border-color: var(--border-strong); }
.chip.kind { background: color-mix(in srgb, var(--vo) 12%, var(--surface)); color: var(--vo); border-color: color-mix(in srgb, var(--vo) 32%, transparent); }
.evt { display: inline-block; background: var(--ar); color: #fff; border-radius: var(--r-sm); padding: 2px 8px; font-size: 11px; margin: 0 5px 5px 0; font-family: var(--mono); }
.repo-line { font-family: var(--mono); font-size: 11.5px; color: color-mix(in srgb, var(--repo) 55%, var(--ink)); background: color-mix(in srgb, var(--repo) 14%, var(--surface)); border: 1px solid color-mix(in srgb, var(--repo) 45%, transparent); border-radius: var(--r-sm); padding: 5px 9px; margin: 6px 0; }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.colh { font-size: 11px; text-transform: uppercase; letter-spacing: .6px; color: var(--ink-mute); font-family: var(--mono); margin: 2px 0 6px; }
@media (max-width: 820px) { .cols { grid-template-columns: 1fr; } }

/* ============================================================
   MOTION — progressive enhancement (gated on .js, killed by
   prefers-reduced-motion). Content is fully visible without JS.
   ============================================================ */

/* scroll reveal */
.js [data-reveal] { opacity: 0; transform: translateY(16px); }
.js [data-reveal].in {
  opacity: 1; transform: none;
  transition: opacity .55s ease-out, transform .55s ease-out;
}

/* hero: blinking command caret + a single slow scan line */
.hero .eyebrow::after {
  content: "▋"; margin-left: 3px; color: var(--panel-cyan);
  animation: ac-caret 1.1s steps(1) infinite;
}
@keyframes ac-caret { 50% { opacity: 0; } }
.hero .inner::after {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--panel-cyan), transparent);
  opacity: 0; animation: ac-scan 7s ease-in-out infinite; pointer-events: none;
}
@keyframes ac-scan {
  0% { transform: translateY(2px); opacity: 0; }
  12% { opacity: .55; }
  50% { transform: translateY(200px); opacity: .5; }
  88% { opacity: .55; }
  100% { transform: translateY(2px); opacity: 0; }
}

/* card hover: a cyan rule "draws" across the bottom edge */
a.card {
  background-color: var(--surface);
  background-image: linear-gradient(var(--primary), var(--primary));
  background-repeat: no-repeat; background-position: 0 100%; background-size: 0% 2px;
  transition: transform .14s ease, box-shadow .14s ease,
              border-color .14s ease, background-size .35s ease;
}
a.card:hover { background-size: 100% 2px; }

/* nav links: underline grows from left on hover/active */
.hd-nav a:not(.gh) {
  background-image: linear-gradient(var(--primary), var(--primary));
  background-repeat: no-repeat; background-position: 0 100%; background-size: 0% 2px;
  transition: background .12s, color .12s, border-color .12s, background-size .2s ease;
}
.hd-nav a:not(.gh):hover, .hd-nav a.active { background-size: 100% 2px; }

/* copy-to-clipboard button on code panels */
.copy-btn {
  position: absolute; top: 4px; right: 8px; z-index: 2;
  font-family: var(--mono); font-size: 10.5px; line-height: 1;
  color: var(--panel-soft); background: transparent;
  border: 1px solid var(--panel-line); border-radius: var(--r-sm);
  padding: 4px 8px; cursor: pointer; opacity: 0;
  transition: opacity .15s, color .15s, border-color .15s;
}
.prose pre:hover .copy-btn, .prose pre:focus-within .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--panel-cyan); border-color: var(--panel-cyan); }
.copy-btn.ok { color: #5dd07e; border-color: #5dd07e; opacity: 1; }
@media (hover: none) { .copy-btn { opacity: .7; } }

/* TOC scrollspy active state (manual) */
.toc a.active {
  background: var(--surface-2); color: var(--primary);
  border-left-color: var(--primary); font-weight: 600;
}
@media (max-width: 920px) { .toc a.active { border-color: var(--primary); } }

/* honor motion preferences — disable all of the above */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important;
      transition-duration: .001ms !important; }
  html { scroll-behavior: auto; }
  .js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .hero .eyebrow::after { content: none; }
  .hero .inner::after { display: none; }
}

/* ---------- responsive ---------- */
@media (max-width: 820px) {
  body { background-size: 22px 22px; }
  .hero h1 { font-size: 28px; }
  .hd-inner { padding: 10px 16px; gap: 10px; }
  .hd-nav { gap: 2px; }
  .hd-nav a { padding: 6px 9px; font-size: 12.5px; }
  .brand { font-size: 14px; }
  .wrap { padding: 0 16px; }
  .crumb { padding: 12px 16px 0; }
  .ctx-row { flex-direction: column; }
  .prose { padding: 6px 16px 20px; }
  .prose pre { font-size: 12px; }
  .card .idx { top: 16px; right: 16px; }
}