:root { --fg:#1d1d1f; --muted:#555; --bg:#fafaf8; --card:#fff; --line:#cfcfc8; --accent:#1f4d3a; --err:#b00020; }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--fg); font:17px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif; }
main { max-width:640px; margin:0 auto; padding:32px 20px 8px; }
.hero { padding-bottom:8px; }
h1 { font-size:1.9rem; line-height:1.2; margin:0 0 12px; }
h2 { font-size:1.5rem; line-height:1.2; letter-spacing:-0.01em; margin:40px 0 14px; }
.lead { font-size:1.1rem; color:var(--muted); margin:0; }
.checks { list-style:none; padding:0; margin:0; }
.checks li { padding:6px 0 6px 28px; position:relative; }
.checks li::before { content:"✓"; position:absolute; left:4px; color:var(--accent); font-weight:700; }
.ponentes { list-style:none; padding:0; margin:0; display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:18px 20px; }
.ponentes li { display:flex; flex-direction:column; gap:2px; min-width:0; }
.p-nombre { font-weight:600; line-height:1.3; }
.p-empresa { font-size:.85rem; color:var(--muted); line-height:1.35; }
.ponentes-sec { margin-top:16px; }
.ponentes-sec .note { margin-top:20px; }
.note { color:var(--muted); margin:10px 0 0; }
.card { background:#f0efe9; border-radius:4px; padding:24px 20px; margin:32px 0 8px; }
.field { margin-bottom:16px; }
label { display:block; font-weight:600; margin-bottom:6px; }
input, select { width:100%; font:inherit; font-size:16px; padding:12px; border:1px solid #8a8a82; border-radius:8px; background:#fff; color:var(--fg); }
input[aria-invalid="true"], select[aria-invalid="true"] { border-color:var(--err); }
:focus-visible { outline:3px solid #2a6fdb; outline-offset:2px; }
.err { color:var(--err); font-size:.95rem; margin:6px 0 0; min-height:0; }
.err:empty { display:none; }
button { width:100%; font:inherit; font-size:17px; font-weight:700; padding:14px; border:0; border-radius:8px; background:var(--accent); color:#fff; cursor:pointer; }
button:disabled { opacity:.6; cursor:wait; }
.privacy { font-size:.85rem; color:var(--muted); margin:12px 0 0; }
.thanks { text-align:center; padding:12px 0; }
.thanks-title { font-size:1.4rem; font-weight:700; margin:0 0 12px; }
.cta { display:inline-block; margin-top:20px; padding:12px 22px; border-radius:8px; background:var(--accent); color:#fff; font-weight:700; text-decoration:none; }
.cta:hover { background:#173b2c; }
html { scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior:auto; } }
.hp { position:absolute; left:-10000px; width:1px; height:1px; overflow:hidden; }
.sr-only { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; }
footer { text-align:center; color:var(--muted); padding:56px 20px 48px; font-size:.85rem; }
[hidden] { display:none !important; }
/* Flyer: visual principal del hero. Celular: ancho completo tras título y subtítulo. Escritorio: hero en dos columnas */
.flyer { margin:24px 0 0; }
.flyer img { display:block; width:100%; height:auto; }
@media (min-width:960px) {
  main { max-width:1120px; }
  .hero-wrap { display:grid; grid-template-columns:minmax(0,1fr) 520px; grid-template-rows:auto 1fr; column-gap:56px; align-items:start; }
  .hero-wrap .hero { grid-column:1; grid-row:1; }
  .hero-wrap .fechas { grid-column:1; grid-row:2; }
  .hero-wrap .flyer { grid-column:2; grid-row:1 / span 2; margin:0; padding-top:6px; }
  .below { display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1fr); column-gap:56px; align-items:start; margin-top:72px; }
  h2 { font-size:1.75rem; }
  .below > .card { margin-top:40px; }
  .ponentes { grid-template-columns:repeat(3,minmax(0,1fr)); gap:22px 56px; }
  .ponentes-sec { margin-top:96px; }
}
@media (min-width:700px) { h1 { font-size:2.4rem; } main { padding-top:56px; } }
@media (min-width:960px) { h1 { font-size:2.7rem; } }