:root{
    --black:#152039; /* tinta de marca, tomada del logo */
    --white:#ffffff;
    --gray:#f4f4f2;
    --border:#e6e6e3;
    --muted:#6b6b6b;
    --max:1180px;
    /* Escala tipográfica — mínimo 16px */
    --fs-meta:16px;   /* labels, nav, botones, footer, metadatos */
    --fs-body:18px;   /* cuerpo de texto */
    --fs-lead:20px;   /* intros y subtítulos */
    --fs-h3:24px;     /* títulos de tarjeta */
  }
  *{margin:0;padding:0;box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    font-family:'Inter',system-ui,sans-serif;
    font-size:var(--fs-body);
    background:var(--white);
    color:var(--black);
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3,.wordmark{font-family:'Space Grotesk',sans-serif;letter-spacing:-0.02em;font-weight:700}
  a{color:inherit;text-decoration:none}
  .wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
  .label{
    font-size:var(--fs-meta);font-weight:600;text-transform:uppercase;
    letter-spacing:0.1em;color:var(--muted);display:block;margin-bottom:18px;
  }
  .btn{
    display:inline-block;background:var(--black);color:var(--white);
    padding:14px 32px;border-radius:100px;font-weight:600;font-size:var(--fs-meta);
    text-transform:uppercase;letter-spacing:0.06em;
    border:1px solid var(--black);transition:all .2s ease;
  }
  .btn:hover{background:var(--white);color:var(--black)}
  .btn.ghost{background:transparent;color:var(--black)}
  .btn.ghost:hover{background:var(--black);color:var(--white)}

  /* Nav */
  nav{
    position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);
    backdrop-filter:blur(12px);border-bottom:1px solid var(--border);
  }
  .nav-inner{display:flex;align-items:center;justify-content:space-between;height:76px}
  .wordmark{font-size:20px;letter-spacing:0.02em}
  .brand{display:flex;align-items:center}
  .logo-img{height:30px;width:auto;display:block}
  .nav-links{display:flex;gap:32px;align-items:center}
  .nav-links a{font-size:var(--fs-meta);font-weight:500;color:var(--muted);transition:color .2s}
  .nav-links a:hover{color:var(--black)}
  .nav-links a.btn{padding:11px 24px;font-weight:600;color:var(--white)}
  .nav-links a.btn:hover{color:var(--black)}
  @media(max-width:760px){.nav-links a:not(.btn){display:none}}

  /* Hero */
  header{padding:64px 0 80px;border-bottom:1px solid var(--border)}
  .hero-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:56px;align-items:stretch}
  h1{font-size:clamp(38px,4.6vw,60px);line-height:1.05;max-width:600px}
  .hero-sub{font-size:var(--fs-lead);color:var(--muted);max-width:600px;margin:22px 0 32px}
  .hero-sub strong{color:var(--black);font-weight:600}
  .hero-ctas{display:flex;gap:14px;flex-wrap:wrap}
  .hero-meta{display:flex;gap:36px;margin-top:44px;flex-wrap:wrap}
  .hero-meta div{font-size:var(--fs-meta);color:var(--muted);line-height:1.5}
  .hero-meta strong{display:block;font-size:var(--fs-body);color:var(--black);font-weight:600;margin-bottom:2px}
  .hero-photo{
    border-radius:20px;overflow:hidden;border:1px solid var(--border);
    background:var(--gray);width:100%;height:100%;min-height:460px;
  }
  .hero-photo img{width:100%;height:100%;object-fit:cover;display:block}
  @media(max-width:760px){
    .hero-grid{grid-template-columns:1fr;gap:32px}
    .hero-photo{order:-1;min-height:320px;max-height:420px}
    h1{max-width:100%}
  }

  /* Sections */
  section{padding:100px 0;border-bottom:1px solid var(--border)}
  h2{font-size:clamp(32px,4.5vw,52px);line-height:1.1;max-width:760px;margin-bottom:18px}
  .section-intro{font-size:var(--fs-lead);color:var(--muted);max-width:640px;margin-bottom:60px}

  /* Servicios numerados */
  .services{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--border);border:1px solid var(--border);border-radius:20px;overflow:hidden}
  .service{background:var(--white);padding:44px 40px;transition:background .25s}
  .service:hover{background:var(--gray)}
  .service .num{font-family:'Space Grotesk';font-size:var(--fs-meta);font-weight:500;color:var(--muted);display:block;margin-bottom:22px}
  .service h3{font-size:var(--fs-h3);margin-bottom:12px}
  .service p{font-size:var(--fs-body);color:var(--muted)}
  @media(max-width:760px){.services{grid-template-columns:1fr}}

  /* Formación en IA */
  #formacion{background:var(--black);color:var(--white)}
  #formacion .label{color:#999}
  #formacion .section-intro{color:#a8a8a8}
  .talks{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
  .talk{border:1px solid #2b3a5c;border-radius:20px;padding:38px 32px;transition:border-color .25s}
  .talk:hover{border-color:#6b7d9e}
  .talk h3{font-size:var(--fs-h3);margin-bottom:6px}
  .talk .fmt{font-size:var(--fs-meta);font-weight:500;text-transform:uppercase;letter-spacing:.08em;color:#8a96ad;display:block;margin-bottom:20px}
  .talk p{font-size:var(--fs-body);color:#a8b1c2}
  #formacion .btn{background:var(--white);color:var(--black);border-color:var(--white);margin-top:52px}
  #formacion .btn:hover{background:transparent;color:var(--white)}
  @media(max-width:860px){.talks{grid-template-columns:1fr}}

  /* Sobre mí */
  .about > div{max-width:760px}
  .timeline{margin-top:44px;border-left:1px solid var(--border);padding-left:32px;display:flex;flex-direction:column;gap:30px}
  .timeline div{position:relative}
  .timeline div::before{
    content:"";position:absolute;left:-36.5px;top:9px;width:9px;height:9px;
    border-radius:50%;background:var(--black);
  }
  .timeline strong{display:block;font-size:var(--fs-body);font-weight:600}
  .timeline span{font-size:var(--fs-meta);color:var(--muted)}
  .about p.bio{font-size:var(--fs-body);color:var(--muted);margin-top:20px}
  .about p.bio strong{color:var(--black);font-weight:600}

  /* FAQ */
  .faq{border-top:1px solid var(--border)}
  .faq details{border-bottom:1px solid var(--border);padding:28px 0}
  .faq summary{
    font-family:'Space Grotesk';font-size:22px;font-weight:700;cursor:pointer;
    list-style:none;display:flex;justify-content:space-between;align-items:center;gap:20px;
  }
  .faq summary::-webkit-details-marker{display:none}
  .faq summary::after{content:"+";font-size:26px;font-weight:400;color:var(--muted);flex-shrink:0}
  .faq details[open] summary::after{content:"–"}
  .faq details p{margin-top:14px;font-size:var(--fs-body);color:var(--muted);max-width:720px}

  /* Contacto */
  #contacto{text-align:center;border-bottom:none}
  #contacto h2{margin:0 auto 18px}
  #contacto .section-intro{margin:0 auto 44px}
  .contact-mail{display:block;font-family:'Space Grotesk';font-size:clamp(22px,3.4vw,36px);font-weight:700;margin-top:40px;text-decoration:underline;text-underline-offset:8px;text-decoration-thickness:2px}

  /* Footer */
  footer{border-top:1px solid var(--border);padding:36px 0}
  .foot{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;font-size:var(--fs-meta);color:var(--muted)}
  .foot a:hover{color:var(--black)}

  /* Reveal */
  .reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
  .reveal.in{opacity:1;transform:none}
  @media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}