/* ==========================================================================
   jays.website — case-study design system
   Shared by /trading/case-study/, /rental/case-study/, /business/case-study/.
   Extends the dark "blueprint/terminal" language of the /architecture/ pages
   but is fully self-contained: system fonts only (no external fetches), so
   pages stay tracker-free and fast. Each page sets --accent via inline style.
   ========================================================================== */

:root {
  --cs-bg:     #0a0d16;
  --cs-panel:  #101623;
  --cs-panel-2:#0d1220;
  --cs-border: rgba(255,255,255,0.08);
  --cs-border-hi: rgba(255,255,255,0.16);
  --cs-text:   #e6e9f0;
  --cs-muted:  #9aa3b7;
  --cs-dim:    #7a8499;         /* WCAG AA on dark bg (5.2:1) for small labels */
  --cs-accent: #4f7cff;          /* overridden per page */
  --cs-green:  #00e5a0;
  --cs-gold:   #ffb800;
  --cs-sans: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --cs-mono: ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, Consolas, 'Liberation Mono', monospace;
}

/* The shared site.css reset already runs; keep this additive. */
body.cs {
  font-family: var(--cs-sans);
  background: var(--cs-bg);
  color: var(--cs-text);
  min-height: 100vh;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
body.cs::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 44px 44px;
}
body.cs .container { position: relative; z-index: 1; max-width: 1080px; }

/* Nav sits on the dark bg — soften the shared nav's own panel slightly */
body.cs nav.site-nav { background: rgba(10,13,22,0.92); }

/* Accessible skip link */
.cs-skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--cs-accent); color: #fff; padding: 0.6rem 1rem;
  border-radius: 8px; z-index: 100; font-weight: 600;
}
.cs-skip:focus { left: 1rem; top: 1rem; }

a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--cs-gold); outline-offset: 2px; border-radius: 4px;
}

/* --- Page head ---------------------------------------------------------- */
.cs-head { padding: 2.5rem 0 1.5rem; }
.cs-crumb {
  font-family: var(--cs-mono); font-size: 0.75rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--cs-dim); margin-bottom: 0.9rem;
}
.cs-crumb a { color: var(--cs-dim); text-decoration: none; }
.cs-crumb a:hover { color: var(--cs-muted); text-decoration: underline; }
.cs-head h1 {
  font-size: clamp(2rem, 5vw, 3.1rem); font-weight: 800;
  letter-spacing: -0.02em; line-height: 1.08; color: #fff;
}
.cs-head h1 .accent { color: var(--cs-accent); }
.cs-lede {
  color: var(--cs-muted); max-width: 680px; margin-top: 1rem;
  font-size: 1.08rem; line-height: 1.75;
}

/* Headline metric chips */
.cs-chips { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.6rem; }
.cs-chip {
  font-family: var(--cs-mono); font-size: 0.8rem; color: var(--cs-text);
  background: var(--cs-panel); border: 1px solid var(--cs-border);
  border-radius: 999px; padding: 0.4rem 0.9rem;
}
.cs-chip b { color: var(--cs-accent); font-weight: 600; }

/* --- Section rhythm ----------------------------------------------------- */
.cs-section { margin: 2.8rem 0; }
.cs-label {
  font-family: var(--cs-mono); font-size: 0.72rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--cs-dim);
  margin-bottom: 1.1rem; display: flex; align-items: center; gap: 0.7rem;
}
.cs-label::after { content: ''; flex: 1; height: 1px; background: var(--cs-border); }
.cs-section h2 {
  font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 700; color: #fff;
  letter-spacing: -0.01em; margin-bottom: 0.8rem;
}
.cs-section > p { color: var(--cs-muted); max-width: 720px; margin-bottom: 1rem; }
/* Inline links carry an underline so they don't rely on color alone (WCAG) */
.cs-section p a, .cs-prose a { color: var(--cs-accent); text-decoration: underline; text-underline-offset: 2px; }
.cs-section p a:hover, .cs-prose a:hover { text-decoration: none; }

/* Panels + cards */
.cs-panel {
  background: var(--cs-panel); border: 1px solid var(--cs-border);
  border-radius: 14px; padding: 1.6rem 1.8rem;
}
.cs-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.1rem; }

/* Decision cards: claim + tradeoff */
.cs-decision {
  background: var(--cs-panel); border: 1px solid var(--cs-border);
  border-left: 3px solid var(--cs-accent); border-radius: 10px;
  padding: 1.3rem 1.4rem;
}
.cs-decision h3 { font-size: 1.05rem; color: #fff; margin-bottom: 0.5rem; }
.cs-decision p { color: var(--cs-muted); font-size: 0.92rem; margin-bottom: 0.6rem; }
.cs-decision .tradeoff {
  font-family: var(--cs-mono); font-size: 0.78rem; color: var(--cs-gold);
  display: block; margin-top: 0.4rem;
}
.cs-decision .tradeoff b { color: var(--cs-gold); font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; font-size: 0.68rem; }

/* Outcome metric tiles */
.cs-metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1rem; }
.cs-metric {
  background: var(--cs-panel); border: 1px solid var(--cs-border);
  border-radius: 12px; padding: 1.2rem 1.3rem;
}
.cs-metric .m-num { font-family: var(--cs-mono); font-size: 1.6rem; font-weight: 600; color: var(--cs-accent); }
.cs-metric .m-lbl { font-size: 0.85rem; color: var(--cs-muted); margin-top: 0.3rem; }
.cs-metric .m-src { font-family: var(--cs-mono); font-size: 0.66rem; color: var(--cs-dim); margin-top: 0.5rem; letter-spacing: 0.04em; }

/* Bulleted feature lists inside panels */
.cs-list { list-style: none; }
.cs-list li { position: relative; padding-left: 1.2rem; margin-bottom: 0.55rem; color: var(--cs-muted); font-size: 0.94rem; }
.cs-list li::before { content: '▸'; position: absolute; left: 0; color: var(--cs-accent); font-size: 0.8rem; top: 0.15rem; }
.cs-list li b, .cs-section p b, .cs-prose b { color: var(--cs-text); font-weight: 600; }

/* --- Architecture diagram (inline SVG) ---------------------------------- */
.cs-diagram {
  background: var(--cs-panel-2); border: 1px solid var(--cs-border);
  border-radius: 14px; padding: 1.5rem; overflow-x: auto;
}
.cs-diagram svg { display: block; width: 100%; height: auto; min-width: 640px; }
.cs-diagram figcaption {
  font-family: var(--cs-mono); font-size: 0.74rem; color: var(--cs-dim);
  margin-top: 0.9rem; text-align: center;
}

/* --- CTA ---------------------------------------------------------------- */
.cs-cta {
  margin: 3rem 0 1rem; background: var(--cs-panel); border: 1px solid var(--cs-border);
  border-radius: 14px; padding: 1.6rem 1.8rem; display: flex; flex-wrap: wrap;
  align-items: center; justify-content: space-between; gap: 1rem;
}
.cs-cta p { color: var(--cs-muted); font-size: 0.98rem; max-width: 460px; }
.cs-cta-btns { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.cs-btn {
  display: inline-block; font-family: var(--cs-mono); font-size: 0.82rem;
  text-decoration: none; padding: 0.65rem 1.2rem; border-radius: 9px; font-weight: 600;
  transition: transform 0.15s ease, filter 0.15s ease;
}
.cs-btn:hover { transform: translateY(-2px); }
.cs-btn.primary { background: var(--cs-accent); color: #0a0d16; }
.cs-btn.secondary { border: 1px solid var(--cs-border-hi); color: var(--cs-text); }

@media (max-width: 640px) {
  .cs-head { padding: 1.6rem 0 1rem; }
  .cs-panel, .cs-cta { padding: 1.3rem; }
}

@media (prefers-reduced-motion: reduce) {
  .cs-btn, .cs-decision { transition: none; }
}

/* Print: flatten to readable light document */
@media print {
  body.cs { background: #fff; color: #111; }
  body.cs::before { display: none; }
  nav.site-nav, .cs-cta, .site-footer, .cs-skip { display: none !important; }
  .cs-panel, .cs-decision, .cs-metric, .cs-diagram { border-color: #ccc; background: #fff; }
}