:root{
  --bg:#0b1020;
  --card:#10162a;
  --ink:#e7eefc;
  --muted:#b9c3db;
  --accent:#46a6ff;
  --accent2:#7b61ff;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto;
  color:var(--ink);
  background:
    radial-gradient(1200px 600px at 15% -10%, #2b3a88 0%, transparent 60%),
    radial-gradient(900px 600px at 100% -20%, #ff7aa8 0%, transparent 55%),
    linear-gradient(180deg, #0a0f1e 0%, #0b1020 100%);
  background-attachment: fixed;
}

/* Nav / Hero */
.nav{
  max-width:1100px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;
  padding:20px;
}
.brand{font-weight:800;letter-spacing:.2px}
.brand span{color:var(--accent)}
.hero{padding-bottom:40px}
.hero-inner{
  max-width:1100px;margin:40px auto 0;padding:0 20px;text-align:center;
}
.hero h1{
  font-size: clamp(32px, 5vw, 56px);
  line-height:1.05;margin:10px 0 12px;
}
.hero h1 span{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;color:transparent}
.subtitle{
  color:var(--muted);max-width:780px;margin:0 auto 24px;font-size:18px
}
.cta-area{display:flex;gap:14px;justify-content:center;margin-top:6px}

.cta, .ghost{
  display:inline-block;text-decoration:none;border-radius:14px;padding:12px 18px;font-weight:700
}
.cta{
  background:linear-gradient(90deg,var(--accent),var(--accent2));
  color:#06121f;box-shadow:0 10px 30px rgba(70,166,255,.25)
}
.cta.small{padding:8px 12px;border-radius:10px}
.cta.wide{padding:14px 28px;font-size:18px}
.ghost{border:1px solid #2d3b6a;color:var(--ink)}

.badges{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin:22px auto 0}
.badges span{background:#0f1a33;border:1px solid #1c2b54;padding:8px 10px;border-radius:10px;color:#cfe0ff;font-size:13px}

/* Sections */
.grid3{
  max-width:1100px;margin:40px auto;padding:0 20px;
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px
}
.grid3 article{
  background:var(--card);border:1px solid #1b2442;border-radius:16px;padding:18px
}
.grid3 h3{margin:0 0 6px}
.grid3 p{color:var(--muted);margin:0}

.how{
  max-width:1000px;margin:20px auto;padding:0 20px 10px;text-align:center
}
.how h2{margin-bottom:6px}
.how ol{max-width:700px;margin:10px auto 0;text-align:left;line-height:1.6;color:var(--muted)}
.how li+li{margin-top:6px}

.demo{
  max-width:1100px;margin:20px auto 60px;padding:0 20px;
  display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:stretch
}
.card{
  background:var(--card);border:1px solid #1b2442;border-radius:18px;padding:22px
}
.card h2{margin:0 0 6px}
.card p{color:var(--muted)}
.bullets{
  list-style:none;margin:0;padding:0;display:grid;gap:12px;
}
.bullets li{
  background:var(--card);border:1px dashed #263055;border-radius:14px;padding:14px 16px;color:#d7e4ff
}

/* Footer */
.footer{
  border-top:1px solid #1b2442;color:#9fb0d6;
  max-width:1100px;margin:40px auto 30px;padding:16px 20px;
  display:flex;justify-content:space-between;align-items:center;gap:12px
}
.footer .back{color:#9fb0d6;text-decoration:none}

/* Responsive */
@media (max-width:900px){
  .grid3{grid-template-columns:1fr}
  .demo{grid-template-columns:1fr}
}

html { scroll-behavior: smooth; }

/* ===== Sponsors ===== */
.sponsors{
  max-width:1100px;
  margin:48px auto 88px;
  padding:0 20px;
}

.sponsor-logos{
  display:grid;                                 /* ← faltaba */
  grid-template-columns:repeat(4, minmax(0,1fr));/* ← define columnas */
  gap:26px;
  margin-bottom:26px;
}

.sponsor-logos img{
  width:100%;
  height:84px;                 /* tamaño consistente */
  object-fit:contain;          /* ← evita deformar logos */
  display:block;
  padding:14px 20px;
  border-radius:16px;
  background:var(--card);
  border:1px solid #1b2442;
  box-shadow:0 8px 22px rgba(0,0,0,.18);
}

/* Filas claras para mejor contraste (aplica a contenedores con clase .light) */
.sponsor-logos.light img{
  background:#fff;
  border-color:#e7ecf5;
  box-shadow:0 1px 0 #fff inset, 0 12px 28px rgba(15,23,42,.10);
}

/* Responsive */
@media (max-width:1100px){
  .sponsor-logos{ grid-template-columns:repeat(3, minmax(0,1fr)); }
}
@media (max-width:700px){
  .sponsor-logos{ grid-template-columns:repeat(2, minmax(0,1fr)); gap:18px; }
  .sponsor-logos img{ height:72px; }
}
@media (max-width:480px){
  .sponsor-logos{ grid-template-columns:1fr; }
  .sponsor-logos img{ height:60px; }
}