:root{
  --azul:#004080;
  --celeste:#00bfff;
  --borde:#0077cc;
  --texto:#003366;
  --fondo:#f0f8ff;
  --ide-min-h: 820px;
  --bg:#ffffff;
  --radius:16px;
  --shadow:0 8px 24px rgba(0,64,128,.14);
  --header-h:72px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{height:100%}
body{
  margin:0;padding:0;
  font-family:ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, Noto Sans, Ubuntu, Cantarell;
  color:var(--texto);
  background:var(--bg);
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(1100px,92%);margin-inline:auto}
.section{padding:72px 0;}

.site-header{position:sticky;top:0;z-index:50; 
  background:linear-gradient(90deg,var(--azul),var(--celeste));
  color:#fff; box-shadow:var(--shadow);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.brand{display:flex;align-items:center;gap:.6rem;color:#fff}
.brand__logo{width:40px;height:40px;border-radius:10px;object-fit:cover;background:#fff;padding:3px}
.brand__name{font-weight:800;letter-spacing:.3px;font-size:1.1rem}

.nav-toggle{display:none;background:none;border:0;color:#fff;cursor:pointer;padding:10px;border-radius:10px}
.nav-toggle:focus-visible{outline:2px solid #fff;outline-offset:2px}
.nav-toggle__bar{display:block;width:24px;height:2px;background:#fff;margin:5px 0}

.site-nav{display:flex;align-items:center}
.nav-list{display:flex;gap:10px;list-style:none;margin:0;padding:0}
.nav-link{color:#fff;font-weight:700;padding:10px 14px;border-radius:999px;border:1.5px solid rgba(255,255,255,.35);transition:background .2s ease, box-shadow .2s ease, color .2s ease}
.nav-link:hover{background:rgba(255,255,255,.15);box-shadow:0 0 0 2px rgba(255,255,255,.25) inset}
.nav-link.is-active{background:#fff;color:var(--azul);border-color:transparent}

@media (max-width:820px){
  .nav-toggle{display:block}
  .site-nav{position:absolute;left:0;right:0;top:var(--header-h)}
  .site-nav[data-collapsed="true"] .nav-list{max-height:0;overflow:hidden}
  .nav-list{flex-direction:column;gap:0;background:linear-gradient(180deg,var(--azul),var(--celeste));padding:10px;border-bottom-left-radius:var(--radius);border-bottom-right-radius:var(--radius);box-shadow:var(--shadow);max-height:460px}
  .nav-link{padding:14px 12px;border-radius:12px}
}

.hero{background:linear-gradient(180deg, rgba(0,191,255,.12), transparent)}
.hero .container{color:var(--texto)}
.hero h1{margin:0 0 .5rem;font-size:clamp(1.6rem,1.2rem + 2vw,2.2rem);color:var(--azul)}

.btn-primario{display:inline-block;margin-top:10px;background:#fff;color:var(--azul);padding:10px 16px;border-radius:12px;font-weight:800;border:2px solid var(--azul);box-shadow:0 4px 12px rgba(0,191,255,.18);transition:background .18s ease, transform .08s ease, box-shadow .18s ease}
.btn-primario:hover{background:#eef7ff;box-shadow:0 6px 16px rgba(0,191,255,.25)}
.btn-primario:active{transform:translateY(1px)}
.btn-primario:focus-visible{outline:0;box-shadow:0 0 0 3px rgba(0,191,255,.35)}

.card{background:#fff;border:1px solid var(--borde);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.card__header{padding:16px;border-bottom:1px solid var(--fondo)}
.card__header h2{margin:0;color:var(--azul)}
.card__header .muted{margin:.25rem 0 0;color:#5b728a;font-size:.95rem}
.ide-embed{padding:12px;background:var(--fondo);min-height:var(--ide-min-h)}
.ide-embed iframe{min-height:var(--ide-min-h);width:100%;border:0;border-radius:12px}

.contact-card{background:#fff;border:1px solid var(--borde);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.contact-card__header h2{margin:.2rem 0;color:var(--azul)}
.contact-card__sub{margin:0;color:#5b728a}
.contact-items{display:flex;flex-wrap:wrap;gap:12px;margin-top:12px}
.contact-item{display:inline-flex;align-items:center;gap:8px;font-weight:700;border:2px solid #e6f2ff;background:#fbfeff;padding:10px 12px;border-radius:12px;color:var(--azul);transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease}
.contact-item:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:var(--borde)}
.icon-sm{width:18px;height:18px;fill:currentColor;opacity:.9}

.site-footer{background:#fff;border-top:1px solid var(--borde)}
.site-footer .container{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:18px 0}
.site-footer .to-top{color:var(--azul);text-decoration:underline;font-weight:700}

.muted{opacity:.9}

@media (max-width:640px){
  :root{--header-h:64px}
  .section{padding:56px 0}
  .brand__logo{width:36px;height:36px}
}