:root{
  --primary:#0d6efd;--secondary:#adb5bd;--light:#f8f9fa;--dark:#212529;--accent:#00bcd4;--bg-dark:#121212;--text-dark:#e9ecef;
}

/* Fondo general */
body{
  font-family:'Segoe UI',Roboto,sans-serif;margin:0;padding:0;
  background:url("logos/fondo.png") no-repeat center center fixed;
  background-size:cover;color:var(--dark);line-height:1.6;
  transition:background .3s,color .3s;
}
body.dark{background:var(--bg-dark);color:var(--text-dark);}
.container{width:90%;max-width:1100px;margin:auto;padding:20px}

/* Hero con imagen y overlay */
.hero{
  background:url("logos/fondo2.png") no-repeat center center/cover;
  color:#fff;text-align:center;padding:80px 20px;
  border-bottom-left-radius:50% 8%;border-bottom-right-radius:50% 8%;
  position:relative;
}
.hero::after{
  content:"";position:absolute;inset:0;background:rgba(0,0,0,.4);
  border-bottom-left-radius:50% 8%;border-bottom-right-radius:50% 8%;
}
.hero .container{position:relative;z-index:1;}
.hero h1{font-size:3rem;margin-bottom:10px;font-weight:bold}
.hero .tagline{font-size:1.3rem;margin-bottom:25px;opacity:.9}

section{margin:60px 0;opacity:0;transform:translateY(30px);transition:all .6s ease}
section.fade-in{opacity:1;transform:translateY(0)}

h2{text-align:center;margin-bottom:30px;color:var(--primary);font-size:2rem;font-weight:bold;position:relative}
h2::after{content:'';display:block;width:60px;height:4px;background:var(--accent);margin:10px auto 0;border-radius:2px}

.skills-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));
  gap:20px;justify-items:center;align-items:center
}
.skill{
  background:#fff;padding:20px;border-radius:12px;box-shadow:0 4px 10px rgba(0,0,0,.05);
  display:flex;align-items:center;justify-content:center;transition:transform .3s ease,box-shadow .3s ease
}
.skill img{width:60px;height:60px;object-fit:contain}
.skill:hover{transform:scale(1.15);box-shadow:0 6px 16px rgba(0,0,0,.15)}
body.dark .skill{background:#1e1e1e;color:var(--text-dark)}

.contact .social-icons{display:flex;justify-content:center;flex-wrap:wrap;gap:15px}
.social-icons a img{width:40px;height:40px;transition:.3s ease}
.social-icons a img:hover{transform:scale(1.2)}

footer{background:var(--dark);color:#fff;text-align:center;padding:20px;margin-top:60px}
body.dark footer{background:#000;color:var(--text-dark)}

/* Botón Dark Mode */
#darkModeToggle{
  position:fixed;bottom:20px;right:20px;background:var(--primary);color:#fff;border:none;border-radius:50%;
  width:50px;height:50px;cursor:pointer;font-size:1.2rem;box-shadow:0 4px 10px rgba(0,0,0,.2);transition:.3s ease
}
#darkModeToggle:hover{transform:scale(1.1)}