/* Congreso de Ingeniería Química - VII CIQ 2026 – Estilo claro, elegante y responsive */
:root{
  --bg:linear-gradient(180deg,#ffffff 0%, #f2f8ff 55%, #e6f6ff 100%);
  --fg:#0f172a;
  --muted:#64748b;
  --surface:#ffffff;
  --brand:#1d4ed8;
  --accent:#06b6d4;
  --ring:#93c5fd;
}
*{box-sizing:border-box}
html{color-scheme:light}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,Cantarell,"Noto Sans",Arial,sans-serif;line-height:1.6;background:var(--bg);color:var(--fg)}
.container{max-width:1100px;margin:0 auto;padding:1rem}
.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:1rem;top:1rem;width:auto;height:auto;background:#fff;color:#000;padding:.5rem 1rem;border-radius:.5rem;box-shadow:0 2px 8px rgba(0,0,0,.15)}

.topbar{background:#ffffffcc;backdrop-filter:saturate(140%) blur(8px);position:sticky;top:0;border-bottom:1px solid #e5e7eb;z-index:999}
.topbar .container{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand{font-weight:900;color:var(--brand);text-decoration:none;letter-spacing:.2px}
.nav{list-style:none;display:flex;gap:.75rem;margin:0;padding:0;flex-wrap:wrap}
.nav a{color:var(--fg);text-decoration:none;padding:.55rem .8rem;border-radius:.6rem}
.nav a:hover,.nav a:focus{background:#e0f2fe}

.hero{position:relative}
.hero-img{width:100%;height:clamp(320px,56vh,760px);object-fit:cover;display:block}

.hero-text{
  position:absolute;
  left:50%;
  transform:translateX(-50%);
  bottom:10%;
  background:linear-gradient(135deg, rgba(255,255,255,.88) 0%, rgba(242,248,255,.90) 50%, rgba(230,246,255,.92) 100%);
  color:var(--fg);
  padding:1.05rem 1.1rem;
  border-radius:1rem;
  box-shadow:0 18px 45px rgba(2,8,23,.10);
  border:1px solid rgba(191,219,254,.55);
  width:min(980px, 92vw);
  text-align:center;
}
.hero-text h1{margin:.1rem 0 .25rem 0;line-height:1.2}
.hero-text .lead{margin:.25rem 0 .4rem 0;color:#111827}
.hero-text .badges{margin:.35rem 0 0 0;color:var(--muted);font-size:.95rem}

.research{margin:.35rem 0 .35rem 0}
.research-title{margin:.25rem 0 .2rem 0;font-weight:800;color:#0f172a}
.research-list{display:inline-block;text-align:left;list-style-position:inside;margin:.15rem 0 0 0;padding:0;color:var(--muted)}
.research-list li{margin:.15rem 0}

.cta{margin:.65rem 0 0 0;display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap}

.btn{display:inline-block;padding:.75rem 1.05rem;border-radius:.8rem;border:1px solid var(--brand);color:var(--brand);background:#fff;cursor:pointer;text-decoration:none;font-weight:700}
.btn.primary{background:linear-gradient(90deg,var(--brand),var(--accent));border-color:transparent;color:#fff}
.btn:focus{outline:3px solid var(--ring);outline-offset:2px}
.btn:hover{transform:translateY(-1px)}

.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem;margin-block:1rem}
.card{background:rgba(255,255,255,.92);border:1px solid #e5e7eb;border-radius:1rem;padding:1rem;box-shadow:0 2px 10px rgba(2,8,23,.04)}
.card h3{margin-top:0}
.note{margin:.5rem 0 0 0;color:var(--muted)}
.feature-list{columns:2;gap:2rem}
.contact{list-style:none;padding:0}
.site-footer{margin-top:2rem;border-top:1px solid #e5e7eb;background:rgba(255,255,255,.92)}

/* Links */
.card a{color:inherit}
.card a:hover{color:var(--brand)}

/* ✅ No subrayado para el correo en Contacto */
.contact a.no-underline{color:inherit;text-decoration:none}
.contact a.no-underline:hover{color:var(--brand);text-decoration:none}

@media (max-width: 860px){
  .hero-text{bottom:6%}
}
@media (max-width: 680px){
  .feature-list{columns:1}
  .hero-text{padding:.9rem}
  .research-list{width:100%}
}