/* ============================================================
   CogniCluster Devblog · devblog.cognicluster.com
   Same star-chart identity as ambientagents.net, tuned for
   long-form technical reading. System fonts only.
   ============================================================ */

:root {
  --void: #05080f;
  --void-2: #070c16;
  --panel: #0b1220;
  --panel-2: #0d1526;
  --line: #1b2942;
  --line-soft: #14203a;
  --ink: #e9eef7;
  --body: #c3cede;
  --muted: #8b9cb5;
  --faint: #5b6b85;
  --amber: #ffb648;
  --amber-dim: #c98a2e;
  --cyan: #4fd8c4;
  --red: #ff5d5d;
  --blue: #6ea8ff;
  --sans: "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--void);
  color: var(--body);
  font-family: var(--sans);
  font-size: 17.5px;
  line-height: 1.72;
  overflow-x: hidden;
}
::selection { background: rgba(255, 182, 72, 0.28); }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

#stars { position: fixed; inset: 0; z-index: 0; pointer-events: none; }

/* ---------- nav ---------- */
nav.top {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: rgba(5, 8, 15, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 28px;
  height: 56px; display: flex; align-items: center; gap: 26px;
}
.brand {
  font-family: var(--mono); font-size: 14px; font-weight: 700;
  letter-spacing: 0.13em; color: var(--ink); white-space: nowrap;
}
.brand b { color: var(--amber); }
.brand:hover { text-decoration: none; }
.nav-links { margin-left: auto; display: flex; gap: 20px; }
.nav-links a {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--muted);
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }

/* ---------- hero (index) ---------- */
.hero {
  position: relative; z-index: 1;
  padding: 150px 0 80px;
  background:
    linear-gradient(180deg, rgba(5,8,15,0.55) 0%, rgba(5,8,15,0.92) 78%, var(--void) 100%),
    url("assets/backdrop-station.jpg") center 30% / cover no-repeat;
  border-bottom: 1px solid var(--line-soft);
}
.hero-inner { max-width: 1080px; margin: 0 auto; padding: 0 28px; }
.hero-crest {
  width: 64px; height: 64px; margin-bottom: 24px; background: var(--amber);
  -webkit-mask: url("assets/wings.png") center / contain no-repeat;
  mask: url("assets/wings.png") center / contain no-repeat;
}
.hero h1 {
  font-size: clamp(40px, 6.4vw, 72px); font-weight: 900; letter-spacing: -0.02em;
  line-height: 1.04; margin: 14px 0 22px; color: var(--ink);
}
.hero h1 em { font-style: normal; color: var(--amber); }
.hero-sub { font-size: 19px; max-width: 62ch; color: var(--body); }
.hero-actions { display: flex; gap: 14px; margin-top: 30px; flex-wrap: wrap; }
.cta-btn {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.1em; text-transform: uppercase;
  color: #10131a; background: var(--amber); padding: 11px 20px; border-radius: 3px; font-weight: 700;
}
.cta-btn:hover { background: #ffc670; text-decoration: none; }
.ghost-btn {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink); border: 1px solid var(--line); padding: 10px 20px; border-radius: 3px;
}
.ghost-btn:hover { border-color: var(--amber); color: var(--amber); text-decoration: none; }

.series-chip {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--amber);
}
.series-chip a { color: var(--amber); }

/* ---------- index cards ---------- */
section { position: relative; z-index: 1; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 70px 28px 90px; }
.sec-label {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--amber); margin-bottom: 26px;
  display: flex; align-items: center; gap: 12px;
}
.sec-label::before {
  content: ""; width: 20px; height: 20px; background: var(--amber);
  -webkit-mask: url("assets/chevron.png") center / contain no-repeat;
  mask: url("assets/chevron.png") center / contain no-repeat;
}
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.card {
  display: block; border: 1px solid var(--line); border-radius: 5px;
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  padding: 24px 26px; color: var(--body); position: relative;
}
.card:hover { border-color: rgba(255, 182, 72, 0.55); text-decoration: none; }
.card-part { font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; color: var(--faint); }
.card h3 { margin: 10px 0 8px; color: var(--ink); font-size: 19px; line-height: 1.3; }
.card p { margin: 0 0 14px; font-size: 14.5px; color: var(--muted); }
.card-go { font-family: var(--mono); font-size: 12px; color: var(--amber); letter-spacing: 0.08em; }
.foot-note { max-width: 72ch; color: var(--muted); font-size: 15px; margin-top: 36px; }

/* ---------- article ---------- */
article {
  position: relative; z-index: 1;
  max-width: 780px; margin: 0 auto;
  padding: 130px 28px 60px;
}
.art-head { margin-bottom: 40px; }
.art-head h1 {
  font-size: clamp(32px, 5vw, 48px); font-weight: 850; letter-spacing: -0.015em;
  line-height: 1.12; color: var(--ink); margin: 14px 0 20px;
}
.preamble {
  color: var(--muted); font-size: 16px; font-style: italic;
  border-left: 2px solid var(--amber); padding-left: 18px;
}
.preamble a { color: var(--blue); }

article h2 {
  font-size: 26px; font-weight: 800; color: var(--ink);
  margin: 52px 0 16px; letter-spacing: -0.01em; line-height: 1.25;
}
article p { margin: 0 0 20px; }
article strong { color: var(--ink); }
article li { margin: 8px 0; }
article code {
  font-family: var(--mono); font-size: 0.86em;
  background: rgba(11, 18, 32, 0.9); border: 1px solid var(--line-soft);
  padding: 1px 6px; border-radius: 3px; color: #d7dfeb;
}
article pre {
  background: #060a13; border: 1px solid var(--line); border-radius: 5px;
  padding: 18px 20px; overflow-x: auto; font-size: 13.5px; line-height: 1.7;
  margin: 0 0 20px;
}
article pre code { background: none; border: none; padding: 0; }
article blockquote {
  margin: 0 0 20px; padding: 4px 0 4px 20px;
  border-left: 2px solid var(--cyan); color: var(--muted);
}

/* tables */
.table-scroll { overflow-x: auto; margin: 0 0 24px; border: 1px solid var(--line); border-radius: 5px; }
article table { border-collapse: collapse; width: 100%; font-size: 14px; }
article th {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--amber); text-align: left; padding: 12px 14px;
  background: rgba(11, 18, 32, 0.9); border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
article td { padding: 11px 14px; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
article tr:last-child td { border-bottom: none; }
article tbody tr:hover { background: rgba(255, 182, 72, 0.04); }

/* diagrams */
.diagram {
  margin: 30px 0 34px; padding: 22px 18px 14px;
  border: 1px solid var(--line); border-radius: 6px;
  background: radial-gradient(120% 140% at 50% 0%, #0a1122 0%, var(--void-2) 75%);
  position: relative;
}
.diagram::before, .diagram::after {
  content: ""; position: absolute; width: 22px; height: 22px;
  background: var(--amber); opacity: 0.8; pointer-events: none;
  -webkit-mask: url("../assets/corner.png") center / contain no-repeat;
  mask: url("../assets/corner.png") center / contain no-repeat;
}
.diagram::before { top: -4px; left: -4px; }
.diagram::after { bottom: -4px; right: -4px; transform: rotate(180deg); }
.diagram svg { width: 100%; height: auto; display: block; }
.diagram figcaption {
  font-family: var(--mono); font-size: 12px; color: var(--faint);
  letter-spacing: 0.05em; margin-top: 12px; text-align: center; line-height: 1.6;
}

/* diagram vocabulary (inline SVGs inherit these) */
.dg-label { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.06em; fill: var(--muted); }
.dg-label.big { font-size: 13px; }
.dg-label.small { font-size: 10px; }
.dg-ink { fill: var(--ink); }
.dg-amber { fill: var(--amber); }
.dg-cyan { fill: var(--cyan); }
.dg-red { fill: var(--red); }
.dg-blue { fill: var(--blue); }
.dg-faint { fill: var(--faint); }
.dg-box { fill: #0b1220; stroke: #2a3c5e; stroke-width: 1.2; }
.dg-box.hot { stroke: var(--amber); }
.dg-box.good { stroke: var(--cyan); }
.dg-box.bad { stroke: var(--red); stroke-dasharray: 5 4; }
.dg-hexline { fill: none; stroke: var(--faint); stroke-width: 1.3; }
.dg-hexline.amber { stroke: var(--amber); }
.dg-hexline.cyan { stroke: var(--cyan); }
.dg-hexline.red { stroke: var(--red); stroke-dasharray: 4 3; }
.dg-hexfill { fill: rgba(79, 216, 196, 0.12); stroke: var(--cyan); stroke-width: 1.3; }
.dg-line { stroke: #2a3c5e; stroke-width: 1.3; fill: none; }
.dg-line.amber { stroke: rgba(255, 182, 72, 0.75); }
.dg-line.cyan { stroke: rgba(79, 216, 196, 0.75); }
.dg-line.red { stroke: rgba(255, 93, 93, 0.75); }
.dg-line.dash { stroke-dasharray: 5 4; }
.dg-line.thick { stroke-width: 2.2; }
.dg-flow { stroke-dasharray: 6 7; animation: dgflow 1.5s linear infinite; }
@keyframes dgflow { to { stroke-dashoffset: -13; } }
.dg-bar { fill: rgba(255, 182, 72, 0.75); }
.dg-bar.dim { fill: #2a3c5e; }
.dg-bar.red { fill: rgba(255, 93, 93, 0.7); }
.dg-bar.cyan { fill: rgba(79, 216, 196, 0.7); }
.dg-pulse { animation: dgpulse 2s ease-in-out infinite; }
@keyframes dgpulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

/* callouts */
.callout {
  margin: 26px 0; padding: 14px 18px;
  border: 1px dashed rgba(255, 182, 72, 0.5); border-radius: 5px;
  font-size: 14.5px; color: var(--muted);
}
.callout.decision { border-color: rgba(110, 168, 255, 0.5); }
.callout-label {
  display: block; font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 0.18em; color: var(--amber); margin-bottom: 6px;
}
.callout.decision .callout-label { color: var(--blue); }

/* article footer nav + bio */
.art-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
  margin: 56px 0 0; padding-top: 30px; border-top: 1px solid var(--line-soft);
}
.art-nav a {
  border: 1px solid var(--line); border-radius: 5px; padding: 14px 18px;
  color: var(--ink); font-weight: 650; font-size: 15px; line-height: 1.4;
}
.art-nav a:hover { border-color: rgba(255, 182, 72, 0.55); text-decoration: none; }
.art-nav a span {
  display: block; font-family: var(--mono); font-size: 11px; font-weight: 400;
  letter-spacing: 0.12em; color: var(--faint); margin-bottom: 5px;
}
.art-nav .next { text-align: right; }
.bio {
  margin-top: 34px; padding: 18px 20px; border-left: 2px solid var(--line);
  color: var(--faint); font-size: 13.5px; font-style: italic; line-height: 1.65;
}

/* ---------- site footer ---------- */
.site-foot { position: relative; z-index: 1; border-top: 1px solid var(--line-soft); padding: 40px 0 56px; }
.foot-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 28px;
  display: flex; justify-content: space-between; gap: 26px; flex-wrap: wrap;
  font-size: 13px; color: var(--muted); font-family: var(--mono);
}
.foot-inner a { color: var(--muted); }
.foot-inner a:hover { color: var(--ink); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; }
}

@media (max-width: 760px) {
  body { font-size: 16.5px; }
  .cards, .art-nav { grid-template-columns: 1fr; }
  .art-nav .next { text-align: left; }
  .nav-links a:not(:last-child) { display: none; }
  article { padding-top: 100px; }
  .hero { padding: 120px 0 60px; }
}