:root{
  --bg:#fff; --bg2:#f5f5f7; --text:#1d1d1f; --muted:#6e6e73; --line:#d2d2d7;
  --accent:#0071e3; --accent-h:#0077ed; --err:#d70015;
  --glass:rgba(255,255,255,.72);
  --ease:cubic-bezier(.22,1,.36,1);
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Helvetica Neue",Inter,Arial,sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#000;--bg2:#161618;--text:#f5f5f7;--muted:#a1a1a6;--line:#38383a;--accent:#2997ff;--accent-h:#47a6ff;--err:#ff453a;--glass:rgba(22,22,24,.72)}
  .logo{filter:invert(1);mix-blend-mode:screen}
}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;scroll-padding-top:4rem;-webkit-text-size-adjust:100%}
body{font:400 1.0625rem/1.5 var(--font);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.logo{mix-blend-mode:multiply;height:1.6rem;width:auto}

/* Navegación translúcida */
.nav{position:sticky;top:0;z-index:20;padding-top:env(safe-area-inset-top);background:var(--glass);
  -webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid transparent;transition:border-color .3s}
.nav.is-scrolled{border-color:var(--line)}
.nav__inner{max-width:1080px;margin:auto;height:3rem;padding:0 1.25rem;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:.6rem;font-weight:600;font-size:1rem;letter-spacing:-.01em}
.nav__menu{display:flex;align-items:center;gap:1.75rem;font-size:.8125rem}
.nav__menu a{opacity:.8;transition:opacity .2s}
.nav__menu a:hover{opacity:1}
.nav__menu .nav__cta{opacity:1;color:#fff;background:var(--accent);padding:.3rem .8rem;border-radius:980px}
.nav__toggle{display:none;width:2.75rem;height:2.75rem;background:none;border:0;position:relative;cursor:pointer}
.nav__toggle span{position:absolute;left:.85rem;right:.85rem;height:1.5px;background:var(--text);transition:transform .4s var(--ease)}
.nav__toggle span:first-child{top:1.05rem}.nav__toggle span:last-child{top:1.6rem}
.nav__toggle[aria-expanded=true] span:first-child{transform:translateY(.27rem) rotate(45deg)}
.nav__toggle[aria-expanded=true] span:last-child{transform:translateY(-.27rem) rotate(-45deg)}

/* Tipografía: tracking negativo en tamaños grandes */
h1,h2{letter-spacing:-.03em;line-height:1.05;font-weight:700}
.hero{min-height:calc(100svh - 3rem);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:4rem 1.25rem 6rem}
.eyebrow{color:var(--muted);font-size:1.25rem;font-weight:600;margin-bottom:1rem}
.display{font-size:clamp(2.5rem,8vw,5.5rem);min-height:2.2em;max-width:14ch}
.display span{display:inline-block;transition:opacity .5s ease,transform .6s var(--ease)}
.display span.is-out{opacity:0;transform:translateY(.25em)}
.lead{font-size:clamp(1.15rem,2.5vw,1.6rem);color:var(--muted);margin:1rem 0 2rem;max-width:32ch;line-height:1.3;letter-spacing:-.01em}
.actions{display:flex;gap:1.5rem;align-items:center;flex-wrap:wrap;justify-content:center}
.link{color:var(--accent);font-size:1.15rem}.link:hover{text-decoration:underline}

/* Botones: feedback inmediato al presionar */
.btn{display:inline-block;font:inherit;font-size:1.0625rem;font-weight:500;border:0;cursor:pointer;border-radius:980px;padding:.75rem 1.5rem;
  transition:transform .35s var(--ease),background .2s}
.btn--primary{background:var(--accent);color:#fff}
.btn--primary:hover{background:var(--accent-h)}
.btn:active,.card:active{transform:scale(.97);transition-duration:.08s}
.btn--block{width:100%}
.btn--ghost{background:var(--bg2);color:var(--accent)}
.btn--ghost:hover{background:var(--line)}
.btn[disabled]{opacity:.6;pointer-events:none}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:8px}

/* Secciones */
.section{padding:7rem 1.25rem}
.section--tint{background:var(--bg2)}
.section__head{max-width:680px;margin:0 auto 3.5rem;text-align:center}
.section__head h2{font-size:clamp(2rem,5vw,3.5rem)}
.section__head p{color:var(--muted);font-size:1.3rem;margin-top:1rem;line-height:1.35}
.section__head strong{color:var(--text);font-weight:600}

.cards{max-width:1080px;margin:auto;display:grid;gap:1.25rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr))}
.card{background:var(--bg2);border-radius:28px;padding:2.25rem;display:flex;flex-direction:column;gap:.75rem;
  transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(0,0,0,.12)}
.card svg{width:2.5rem;height:2.5rem;stroke:var(--accent);fill:none;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:1.6rem;letter-spacing:-.02em;line-height:1.15}
.card p{color:var(--muted);flex:1}
.card a{color:var(--accent);margin-top:.5rem}.card a:hover{text-decoration:underline}

.team{max-width:1080px;margin:auto;display:grid;gap:3rem;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));text-align:center}
.team b{display:block;font-size:1.5rem;letter-spacing:-.02em;margin-bottom:.4rem}
.team span{color:var(--muted)}
.partners{text-align:center;margin-top:4rem;font-size:1.25rem;font-weight:600;letter-spacing:-.01em}
.partners span{display:block;color:var(--muted);font-size:.8rem;font-weight:500;text-transform:uppercase;letter-spacing:.1em;margin-bottom:.4rem}

/* Formulario */
.form{max-width:480px;margin:auto;display:grid;gap:1rem}
.field span{display:block;font-size:.8125rem;color:var(--muted);margin:0 0 .35rem .25rem}
.field input,.field textarea{width:100%;font:inherit;color:var(--text);background:var(--bg2);border:1px solid transparent;border-radius:14px;padding:.85rem 1rem;resize:vertical;transition:border-color .2s,box-shadow .2s}
.field input:focus,.field textarea:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 25%,transparent)}
.field.is-invalid input,.field.is-invalid textarea{border-color:var(--err)}
.field small{display:block;color:var(--err);font-size:.8125rem;margin:.35rem 0 0 .25rem}
.error{color:var(--err);font-size:.875rem;text-align:center;min-height:0}

.footer{border-top:1px solid var(--line);padding:2rem 1.25rem calc(2rem + env(safe-area-inset-bottom));font-size:.75rem;color:var(--muted)}
.footer__inner{max-width:1080px;margin:auto;display:flex;flex-wrap:wrap;gap:.5rem 2rem;justify-content:space-between}
.footer a:hover{color:var(--text);text-decoration:underline}

.toast{position:fixed;left:50%;bottom:calc(1.5rem + env(safe-area-inset-bottom));z-index:30;transform:translate(-50%,150%);
  background:var(--glass);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);
  border:1px solid var(--line);border-radius:18px;padding:.9rem 1.4rem;font-size:.95rem;box-shadow:0 12px 40px rgba(0,0,0,.18);
  transition:transform .6s var(--ease);max-width:90vw;text-align:center}
.toast.is-on{transform:translate(-50%,0)}

/* Ventana modal (sheet) */
.sheet{border:0;border-radius:28px;padding:2rem;width:min(92vw,400px);margin:auto;color:var(--text);background:var(--bg);
  box-shadow:0 30px 80px rgba(0,0,0,.35);opacity:0;transform:translateY(24px) scale(.96);
  transition:opacity .3s ease,transform .5s var(--ease)}
.sheet.is-open{opacity:1;transform:none}
.sheet::backdrop{background:rgba(0,0,0,0);-webkit-backdrop-filter:blur(0);backdrop-filter:blur(0);transition:background .4s,backdrop-filter .4s,-webkit-backdrop-filter .4s}
.sheet.is-open::backdrop{background:rgba(0,0,0,.4);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}
.sheet form{display:grid;gap:1rem;text-align:center}
.sheet .logo{margin:0 auto}
.sheet h2{font-size:1.75rem}
.sheet__sub{color:var(--muted);margin-top:-.5rem}
.sheet .field{text-align:left}
.sheet.is-shake{animation:shake .4s}
@keyframes shake{20%{transform:translateX(-8px)}40%{transform:translateX(7px)}60%{transform:translateX(-4px)}80%{transform:translateX(2px)}}
@media (prefers-reduced-transparency:reduce){.sheet.is-open::backdrop{-webkit-backdrop-filter:none;backdrop-filter:none;background:rgba(0,0,0,.7)}}
@media (prefers-reduced-motion:reduce){.sheet{transform:none}.sheet.is-shake{animation:none}}

/* Aparición al hacer scroll */
.js .reveal{opacity:0;transform:translateY(24px);transition:opacity .8s ease,transform .9s var(--ease)}
.js .reveal.is-in{opacity:1;transform:none}

@media (max-width:720px){
  .nav__toggle{display:block}
  .nav__menu{position:absolute;top:100%;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;padding:.5rem 1.25rem 1.25rem;
    background:var(--glass);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);
    font-size:1.25rem;opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .3s,transform .4s var(--ease),visibility .3s}
  .nav__menu.is-open{opacity:1;visibility:visible;transform:none}
  .nav__menu a{padding:.8rem 0;border-bottom:1px solid var(--line)}
  .nav__menu .nav__cta{margin-top:1rem;text-align:center;border:0;padding:.8rem}
  .section{padding:5rem 1.25rem}
}

/* Accesibilidad */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms!important}
  .js .reveal{transform:none}.display span.is-out{transform:none}
}
@media (prefers-reduced-transparency:reduce){
  .nav,.nav__menu,.toast{background:var(--bg);-webkit-backdrop-filter:none;backdrop-filter:none}
}
@media (prefers-contrast:more){.field input,.field textarea{border-color:var(--text)}.nav{border-color:var(--text)}}