/* ===== Architectural Traits of AI — shared styles =====
   Dark theme is the default; light theme applies via the explicit
   toggle (html[data-theme="light"], persisted in localStorage).  */

:root {
  /* dark theme, matched to the adunet.eu palette */
  color-scheme: dark;
  --page:        #060912;
  --surface:     #0c1424;
  --ink:         #e9eefb;
  --ink-2:       #9aa8c4;
  --muted:       #6b7896;
  --line:        rgba(140, 170, 230, 0.14);
  --grid:        rgba(140, 170, 230, 0.12);
  --baseline:    rgba(140, 170, 230, 0.28);
  --accent:      #38bdf8;
  --accent-ink:  #7dd3fc;
  --accent-soft: rgba(56, 189, 248, 0.12);
  --wash:        rgba(255, 255, 255, 0.055);
  --s1:          #3b82f6;   /* series: blue   */
  --s2:          #22d3ee;   /* series: cyan   */
  --s3:          #7c5cff;   /* series: violet */
  --good:        #34d399;
  --good-text:   #34d399;
  --warning:     #fab219;
  --serious:     #ec835a;
  --critical:    #f87171;
  --shadow:      0 10px 30px -12px rgba(0, 0, 0, 0.55);
}

:root[data-theme="light"] {
  color-scheme: light;
  --page:        #f9f9f7;
  --surface:     #fcfcfb;
  --ink:         #0b0b0b;
  --ink-2:       #52514e;
  --muted:       #898781;
  --line:        rgba(11, 11, 11, 0.10);
  --grid:        #e1e0d9;
  --baseline:    #c3c2b7;
  --accent:      #2a78d6;
  --accent-ink:  #1c5cab;
  --accent-soft: #cde2fb;
  --wash:        #f0efec;
  --s1:          #2a78d6;
  --s2:          #eb6834;
  --s3:          #1baf7a;
  --good:        #0ca30c;
  --good-text:   #006300;
  --critical:    #d03b3b;
  --shadow:      0 1px 2px rgba(11,11,11,.04), 0 4px 16px rgba(11,11,11,.05);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

/* ---------- header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .bar {
  max-width: 1060px;
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.brand {
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
.brand svg { flex: 0 0 auto; }
.site-nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
  flex-wrap: wrap;
}
.site-nav a {
  color: var(--ink-2);
  text-decoration: none;
  font-size: 13.5px;
  padding: 6px 10px;
  border-radius: 8px;
}
.site-nav a:hover { background: var(--wash); color: var(--ink); }
.site-nav a[aria-current="page"] {
  color: var(--accent-ink);
  font-weight: 600;
  background: var(--accent-soft);
}
.theme-toggle {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-2);
  border-radius: 8px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  cursor: pointer;
  flex: 0 0 auto;
}
.theme-toggle:hover { color: var(--ink); background: var(--wash); }
.theme-toggle .icon-sun { display: block; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* ---------- layout ---------- */
main {
  max-width: 1060px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}
.hero { padding: 24px 0 8px; }
.eyebrow {
  color: var(--accent-ink);
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin: 0 0 10px;
}
h1 {
  font-size: clamp(30px, 4.5vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}
.lede {
  color: var(--ink-2);
  font-size: 18px;
  max-width: 62ch;
  margin: 0 0 8px;
}
h2 {
  font-size: 24px;
  letter-spacing: -0.01em;
  margin: 56px 0 6px;
}
h3 { font-size: 17px; margin: 28px 0 8px; }
p  { color: var(--ink-2); max-width: 72ch; }
strong { color: var(--ink); }
section > p:first-of-type { margin-top: 0; }
.section-sub { color: var(--muted); font-size: 14.5px; margin: 0 0 22px; }

/* ---------- cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 22px 0;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
  box-shadow: var(--shadow);
}
a.card {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform .12s ease, border-color .12s ease;
}
a.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card .icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
}
.card h3 { margin: 4px 0 0; font-size: 18px; }
.card p { font-size: 14.5px; margin: 0; }
.card .go {
  margin-top: auto;
  padding-top: 8px;
  color: var(--accent-ink);
  font-weight: 600;
  font-size: 14px;
}
.card ul { margin: 0; padding-left: 18px; color: var(--ink-2); font-size: 14.5px; }
.card ul li { margin: 3px 0; }

/* model / pattern detail blocks */
.model-card { margin: 20px 0; }
.model-card header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}
.model-card header h3 { margin: 0; font-size: 20px; }
.tagline { color: var(--muted); font-size: 14px; }
.io-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-ink);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 5px 14px;
  margin: 6px 0 12px;
}
.trait-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 8px 24px;
  margin-top: 10px;
}
.trait-cols h4 {
  margin: 8px 0 4px;
  font-size: 12.5px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
}
.trait-cols ul { margin: 0; padding-left: 18px; font-size: 14.5px; color: var(--ink-2); }
.trait-cols li { margin: 3px 0; }
.trait-cols .choose h4  { color: var(--good-text); }
.trait-cols .avoid h4   { color: var(--critical); }

/* in-content links */
main a { color: var(--accent-ink); }
.go-deeper { font-weight: 600; font-size: 14px; margin: 12px 0 0; }
.go-deeper a { text-decoration: none; }
.go-deeper a:hover { text-decoration: underline; }

/* pills */
.pill {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  border-radius: 999px;
  padding: 2px 10px;
  border: 1px solid var(--line);
  color: var(--ink-2);
  background: var(--wash);
}
a.pill { text-decoration: none; font-size: 13px; padding: 6px 14px; }
a.pill:hover { border-color: var(--accent); color: var(--ink); }
.pill-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }

/* ---------- callouts ---------- */
.callout {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 10px;
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 15px;
  color: var(--ink-2);
}
.callout strong { color: var(--ink); }
.callout.rule { border-left-color: var(--s2); }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; margin: 18px 0; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
th, td { text-align: left; padding: 10px 16px; border-top: 1px solid var(--line); vertical-align: top; }
thead th {
  border-top: 0;
  font-size: 12.5px;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--wash);
}
td { color: var(--ink-2); }
td:first-child { color: var(--ink); font-weight: 600; white-space: nowrap; }
td.num { font-variant-numeric: tabular-nums; }

/* ---------- figures / charts ---------- */
figure.viz {
  margin: 22px 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 20px 14px;
  box-shadow: var(--shadow);
}
figure.viz figcaption { font-size: 13px; color: var(--muted); margin-top: 10px; }
figure.viz .viz-title { font-weight: 700; font-size: 15px; color: var(--ink); margin: 0 0 2px; }
figure.viz .viz-sub { font-size: 13px; color: var(--muted); margin: 0 0 14px; }
figure.viz svg { width: 100%; height: auto; display: block; }

.legend { display: flex; gap: 18px; flex-wrap: wrap; margin: 0 0 10px; font-size: 13px; color: var(--ink-2); }
.legend span { display: inline-flex; align-items: center; gap: 7px; }
.legend i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }

/* svg text + chrome (charts inherit theme via CSS vars) */
svg text { font-family: system-ui, -apple-system, "Segoe UI", sans-serif; }
.ax     { fill: var(--muted); font-size: 12px; }
.ax-num { fill: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.lbl    { fill: var(--ink); font-size: 12.5px; font-weight: 600; }
.lbl-2  { fill: var(--ink-2); font-size: 12.5px; }
.val    { fill: var(--ink); font-size: 12px; font-weight: 600; font-variant-numeric: tabular-nums; }
.gridline { stroke: var(--grid); stroke-width: 1; }
.axisline { stroke: var(--baseline); stroke-width: 1; }
.bar-s1 { fill: var(--s1); }
.bar-s2 { fill: var(--s2); }
.bar-s3 { fill: var(--s3); }
svg .hoverable:hover { opacity: .85; }

/* diagram (flow) pieces */
.dg-box    { fill: var(--wash); stroke: var(--baseline); stroke-width: 1; rx: 8; }
.dg-box-hi { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.2; rx: 8; }
.dg-txt    { fill: var(--ink); font-size: 13px; font-weight: 600; }
.dg-sub    { fill: var(--ink-2); font-size: 11.5px; }
.dg-note   { fill: var(--muted); font-size: 11.5px; }
.dg-edge   { stroke: var(--muted); stroke-width: 1.4; fill: none; }
.dg-edge-hi{ stroke: var(--accent); stroke-width: 1.6; fill: none; }
.dg-yes    { fill: var(--good-text); font-size: 11.5px; font-weight: 700; }
.dg-no     { fill: var(--critical); font-size: 11.5px; font-weight: 700; }

/* ---------- prev / next footer ---------- */
.pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}
.pager a {
  text-decoration: none;
  color: var(--accent-ink);
  font-weight: 600;
  font-size: 14.5px;
  max-width: 46%;
}
.pager a small { display: block; color: var(--muted); font-weight: 400; font-size: 12px; }
.pager .next { text-align: right; margin-left: auto; }

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  padding: 24px;
}

@media (max-width: 640px) {
  .site-header .bar { flex-wrap: wrap; }
  .site-nav { margin-left: 0; }
}