/* Cerebro site tokens: brand guidelines v2.x dark mode (master-brain/BRAND_GUIDELINES.md in the workspace).
   Change a palette color here and nowhere else. Pages map their own variable names onto these. */
:root {
  --c-night: #060B1B;      /* page */
  --c-raised: #0B1228;     /* raised surfaces, terminals, strips */
  --c-card: #111934;       /* cards */
  --c-deep: #172554;       /* band start */
  --c-navy: #1E3A8A;       /* band middle */
  --c-royal: #1E40AF;      /* buttons (white text 8.72:1), band end */
  --c-royal-2: #2563EB;    /* button edge and hover (white text 5.17:1) */
  --c-accent: #3B82F6;     /* accent text on night (5.33:1) */
  --c-white: #FFFFFF;      /* headings */
  --c-ice: #DBEAFE;        /* body text (16.06:1) */
  --c-text-2: #B4C3E2;     /* sub copy (11.06:1), captions on the band (4.92:1) */
  --c-muted: #8B9AC0;      /* captions on night only (6.98:1) */
  --c-line: rgba(59, 130, 246, .18);
  --c-line-solid: #1C2B57;
  --c-band: linear-gradient(135deg, #172554 0%, #1E3A8A 55%, #1E40AF 100%);
  --c-font: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --c-mono: 'JetBrains Mono', Menlo, Consolas, monospace;
}
::selection { background: var(--c-royal-2); color: var(--c-white); }
:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }

/* ===== Shared chrome: the same nav and footer on every page (Fable ruling 2026-10-04) ===== */
.site-nav { position: sticky; top: 0; z-index: 1000; height: 64px; padding: 0 2rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  background: rgba(6, 11, 27, .86); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); border-bottom: 1px solid var(--c-line);
  font-family: var(--c-font); }
.site-nav a { text-decoration: none; }
.sn-brand { display: flex; align-items: baseline; gap: 10px; flex-shrink: 0; white-space: nowrap; min-height: 44px; align-items: center; }
.sn-mark { font-family: var(--c-mono); font-weight: 700; font-size: 1.02rem; letter-spacing: .04em; color: var(--c-white); }
.sn-mark::before { content: "\259E  "; color: var(--c-accent); }
.sn-sub { font-family: var(--c-mono); font-size: .6rem; letter-spacing: .1em; text-transform: uppercase; color: var(--c-text-2); }
.sn-links { display: flex; align-items: center; gap: 1.6rem; list-style: none; margin: 0; padding: 0; }
.sn-links a, .sn-menu ul a { display: inline-flex; align-items: center; min-height: 44px; font-size: .9rem; font-weight: 500; color: var(--c-text-2); transition: color .2s; }
.sn-links a:hover, .sn-menu ul a:hover, .sn-links a[aria-current="page"] { color: var(--c-white); }
.sn-links a.sn-cta, .sn-menu ul a.sn-cta { min-height: 40px; padding: 0 1.1rem; border-radius: 7px; border: 1px solid var(--c-royal-2); background: var(--c-royal); color: var(--c-white); font-weight: 600; }
.sn-links a.sn-cta:hover { background: var(--c-royal-2); }
.sn-menu { display: none; position: relative; }
.sn-menu summary { list-style: none; cursor: pointer; display: inline-flex; align-items: center; min-height: 44px; padding: 0 1rem; border-radius: 7px;
  border: 1px solid rgba(219, 234, 254, .3); color: var(--c-ice); font-size: .9rem; font-weight: 600; }
.sn-menu summary::-webkit-details-marker { display: none; }
.sn-menu[open] summary { border-color: var(--c-accent); }
.sn-menu ul { position: absolute; right: 0; top: calc(100% + 10px); min-width: 210px; list-style: none; margin: 0; padding: .5rem;
  background: var(--c-raised); border: 1px solid var(--c-line); border-radius: 12px; box-shadow: 0 24px 48px -20px rgba(0, 0, 0, .8); }
.sn-menu ul a { width: 100%; padding: 0 .8rem; border-radius: 7px; }
.sn-menu ul a:hover { background: rgba(59, 130, 246, .1); }
.sn-menu ul a.sn-cta { justify-content: center; margin-top: .4rem; }
@media (max-width: 860px) { .sn-links { display: none; } .sn-menu { display: block; } .site-nav { padding: 0 1rem; } }
@media (max-width: 420px) { .sn-sub { display: none; } }

.site-footer { position: relative; z-index: 1; background: var(--c-band); border-top: 3px solid var(--c-royal-2); color: var(--c-ice);
  padding: 2.75rem 2rem; font-family: var(--c-font); text-align: left; font-size: .82rem; }
.sf-inner { max-width: 1100px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1.25rem 2rem; }
.sf-name { font-family: var(--c-mono); font-size: .9rem; font-weight: 700; color: var(--c-white); }
.sf-name::before { content: "\259E  "; color: var(--c-white); }
.sf-tag { font-size: .8rem; color: var(--c-text-2); margin-top: .2rem; }
.sf-reg { font-family: var(--c-mono); font-size: .72rem; letter-spacing: .03em; color: var(--c-text-2); margin-top: .45rem; }
.sf-right { color: var(--c-text-2); text-align: right; line-height: 1.4; }
.sf-right a { display: inline-flex; align-items: center; min-height: 44px; color: var(--c-ice); text-decoration: none; margin: 0; }
.sf-right a:hover { color: var(--c-white); text-decoration: underline; }
@media (max-width: 640px) { .site-footer { padding: 2.25rem 1.25rem; } .sf-inner { flex-direction: column; align-items: flex-start; } .sf-right { text-align: left; } }