/* ETC Lab Redesign Main Stylesheet */

/* CSS Reset (modern minimal) */
*,*::before,*::after{box-sizing:border-box}
html:focus-within{scroll-behavior:smooth}
body{font-family:var(--font-sans);margin:0;min-height:100vh;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit}

:root{
  --bg:#ffffff;
  --fg:#0e1220;
  --muted:#5a6883;
  --brand:#13294B; /* Illini Blue */
  --accent:#FF5F05; /* Illini Orange (web) */
  --card:#ffffff;
  --ring: rgba(19,41,75,.25);
  --font-sans: "Source Sans Pro", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  --font-head: "Montserrat", var(--font-sans);
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0a0d14;
    --fg:#e6e8ef;
    --muted:#9aa3b2;
    --brand:#6aa3ff; /* derived for dark theme accents */
    --accent:#ff8a3a; /* derived orange for dark contexts */
    --card:#121826;
    --ring: rgba(106,163,255,.35);
  }
}


body{font-family:var(--font-sans);background:var(--bg);color:var(--fg);font:16px/1.55 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,"Helvetica Neue",Arial}
.container{width:100%;max-width:1100px;margin-inline:auto;padding-inline:1rem}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* Header */
.site-header{position:relative;background:var(--bg);border-bottom:1px solid color-mix(in oklab, var(--ring), transparent 40%)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-block:.6rem}
.branding .site-title{display:flex;align-items:center;gap:.6rem;font-weight:700;font-size:1.1rem}
.branding .site-tagline{color:var(--muted);margin:.1rem 0 0}
.site-nav{display:flex;align-items:center;gap:1rem}
.menu{display:flex;gap:1rem;list-style:none;margin:0;padding:0}
.menu a{padding:.5rem .7rem;border-radius:.5rem}
.menu a:focus-visible{outline:2px solid var(--ring);outline-offset:2px}
.nav-toggle{display:none;border:1px solid color-mix(in oklab, var(--fg), transparent 70%);background:transparent;border-radius:.6rem;padding:.4rem .6rem}
.theme-toggle{border:1px solid color-mix(in oklab, var(--fg), transparent 70%);background:transparent;border-radius:.6rem;padding:.3rem .55rem}

@media (max-width: 820px){
  .menu{display:none;position:absolute;top:3.2rem;right:1rem;flex-direction:column;background:var(--bg);padding:.5rem;border:1px solid color-mix(in oklab, var(--ring), transparent 50%);border-radius:.8rem;box-shadow:0 8px 30px rgba(0,0,0,.08)}
  .nav-toggle{display:inline-block}
  .site-nav[aria-expanded="true"] .menu{display:flex}
}

/* Hero */
.hero{padding:4rem 0;background:linear-gradient(180deg, color-mix(in oklab, var(--brand), transparent 85%), transparent)}
.hero-inner{display:grid;grid-template-columns:1.2fr .8fr;gap:2rem;align-items:center}
.hero h1{font-size:clamp(2rem, 2.6vw, 2.8rem);line-height:1.1;margin:0 0 .8rem}
.hero p{color:var(--muted);max-width:52ch}
.badges{display:flex;flex-wrap:wrap;gap:.6rem;margin:1rem 0 0;padding:0;list-style:none}
.badges li{font-size:.85rem;background:var(--card);padding:.35rem .6rem;border-radius:999px;border:1px solid color-mix(in oklab, var(--ring), transparent 55%)}

.hero-visual{display:grid;place-items:center}
.hero-shape{width:100%;aspect-ratio:1/1;border-radius:1.2rem;background:
 radial-gradient(80% 60% at 70% 30%, color-mix(in oklab, var(--accent), transparent 70%), transparent),
 radial-gradient(70% 50% at 20% 80%, color-mix(in oklab, var(--brand), transparent 70%), transparent),
 var(--card);
 border:1px solid color-mix(in oklab, var(--ring), transparent 55%);
 box-shadow:0 20px 80px rgba(0,0,0,.08);
}

.cta-row{display:flex;gap:.8rem;margin-top:1rem}
.btn{display:inline-block;border-radius:.8rem;padding:.7rem 1rem;font-weight:600;border:1px solid transparent}
.btn-primary{background:var(--brand);color:white}
.btn-outline{border-color:color-mix(in oklab, var(--fg), transparent 70%)}

/* Sections */
.section{padding:3rem 0;border-top:1px solid color-mix(in oklab, var(--ring), transparent 50%)}
.section-head{display:flex;align-items:end;justify-content:space-between;margin-bottom:1rem}
.link-more{color:var(--brand);font-weight:600}

.cards .card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.card{background:var(--card);border:1px solid color-mix(in oklab, var(--ring), transparent 55%);border-radius:1rem;overflow:hidden;display:flex;flex-direction:column}
.card-media img{width:100%;height:220px;object-fit:cover}
.card-body{font-family:var(--font-sans);padding:1rem}
.card-title{margin:0 0 .3rem;font-size:1.05rem}
.card-text{color:var(--muted);margin:.2rem 0 .6rem}
.card-cta{color:var(--brand);font-weight:600}

@media (max-width: 980px){ .cards .card-grid{grid-template-columns:repeat(2,1fr)} }
@media (max-width: 640px){ .hero-inner{grid-template-columns:1fr} .cards .card-grid{grid-template-columns:1fr} }

.split .split-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem}
.list{list-style:none;margin:0;padding:0;display:grid;gap:.6rem}
.list .meta{color:var(--muted);font-size:.9rem}
@media (max-width: 820px){ .split .split-grid{grid-template-columns:1fr} }

/* CTA band */
.cta-band{background:linear-gradient(90deg, color-mix(in oklab, var(--brand), transparent 75%), color-mix(in oklab, var(--accent), transparent 75%));}
.cta-band-inner{padding:2rem 0;display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}

/* Footer */
.site-footer{padding:2rem 0;background:color-mix(in oklab, var(--brand), transparent 90%);border-top:1px solid color-mix(in oklab, var(--ring), transparent 50%)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:1.4rem}
.footer-menu, .contact-list{list-style:none;margin:0;padding:0;display:grid;gap:.4rem}
.footer-meta{border-top:1px solid color-mix(in oklab, var(--ring), transparent 60%);margin-top:1.4rem;padding-top:1rem;color:var(--muted)}
@media (max-width: 820px){ .footer-grid{grid-template-columns:1fr} }

/* Focus rings */
:focus-visible{outline:3px solid var(--ring);outline-offset:3px}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{transition:none !important;animation:none !important}
}

/* Overlay Navigation (temporary, non-sticky) */
.site-header{position:relative;background:var(--bg);border-bottom:1px solid color-mix(in oklab, var(--ring), transparent 40%)}
.header-inner{padding-block:.6rem}
.nav-toggle{display:inline-block}
#site-nav{position:fixed;inset:0;display:none;background:color-mix(in oklab, var(--bg), transparent 0%);z-index:1500;padding:2rem}
#site-nav[aria-expanded="true"]{display:block}
#primary-menu{display:grid;gap:1rem;list-style:none;padding:0;margin:3rem 0 0}
#primary-menu a{font-size:clamp(1.4rem, 2vw, 2rem);font-family:var(--font-head);font-weight:700;padding:.25rem 0}
.theme-toggle{position:fixed;top:1rem;right:1rem}

/* Overlay close button */
.nav-close{position:absolute;top:1rem;left:1rem;border:1px solid color-mix(in oklab, var(--fg), transparent 70%);background:transparent;border-radius:.6rem;padding:.4rem .6rem;font-weight:600}
#site-nav{overflow:auto}


/* Explicit theme overrides (toggle) */
html.dark{
  --bg:#0a0d14;
  --fg:#e6e8ef;
  --muted:#9aa3b2;
  --brand:#6aa3ff;
  --accent:#ff8a3a;
  --card:#121826;
  --ring: rgba(106,163,255,.35);
}
html.light{
  --bg:#ffffff;
  --fg:#0e1220;
  --muted:#5a6883;
  --brand:#13294B;
  --accent:#FF5F05;
  --card:#ffffff;
  --ring: rgba(19,41,75,.25);
}

/* Content typography */
.content-wrap .entry-title{margin:0 0 .6rem;font-size:clamp(1.6rem,2.2vw,2.2rem)}
.prose{font-size:1rem;line-height:1.7;display:grid;gap:1rem;color:var(--fg)}
.prose p{margin:0}
.prose h2{margin:1.4rem 0 .4rem;font-size:1.4rem}
.prose h3{margin:1rem 0 .3rem;font-size:1.2rem}
.prose a{color:var(--brand);text-decoration:underline}
.prose blockquote{border-left:4px solid var(--brand);padding:.4rem .8rem;margin:0;background:color-mix(in oklab, var(--brand), transparent 92%)}
.prose ul,.prose ol{padding-left:1.4rem;display:grid;gap:.3rem}
.prose figure{margin:0}
.prose img{border-radius:.5rem}
.archive-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
@media(max-width:980px){.archive-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.archive-grid{grid-template-columns:1fr}}