/* ============================================
   SBIT Ingeniería — Estilos de landing pages
   (páginas de servicio y de ciudad)
   ============================================ */
:root{
  --s-bg:#0A0F1A; --s-bg2:#0F172A; --s-surface:rgba(14,23,38,.65);
  --s-border:rgba(148,163,184,.16); --s-border-strong:rgba(107,158,167,.4);
  --s-text:#CBD5E1; --s-heading:#F1F5F9; --s-muted:#94A3B8;
  --s-primary:#628C90; --s-accent:#6B9EA7;
  --s-font:'Inter','Segoe UI',system-ui,sans-serif;
  --s-radius:16px; --s-max:1080px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--s-font);font-size:16px;line-height:1.75;color:var(--s-text);background:var(--s-bg);-webkit-font-smoothing:antialiased}
a{color:var(--s-accent);text-decoration:none;transition:color .2s}
a:hover{color:var(--s-primary)}
img{max-width:100%;display:block}

/* Header */
.s-header{position:sticky;top:0;z-index:20;background:rgba(10,15,26,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--s-border)}
.s-header__in{max-width:var(--s-max);margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.s-header__logo img{height:52px;width:auto}
.s-nav{display:flex;align-items:center;gap:26px}
.s-nav a{color:var(--s-text);font-weight:600;font-size:.95rem}
.s-nav a:hover{color:var(--s-accent)}
.s-nav__cta{background:var(--s-accent);color:#06222a !important;padding:9px 18px;border-radius:999px}
.s-nav__cta:hover{background:var(--s-primary);color:#fff !important}
@media(max-width:720px){.s-nav{gap:14px}.s-nav__hide{display:none}}

/* Hero */
.s-hero{position:relative;overflow:hidden;background:
  radial-gradient(1200px 500px at 80% -10%,rgba(98,140,144,.25),transparent 60%),
  linear-gradient(180deg,#0B1220,#0A0F1A)}
.s-hero__in{max-width:var(--s-max);margin:0 auto;padding:64px 24px 56px}
.s-breadcrumb{font-size:.82rem;color:var(--s-muted);margin-bottom:18px}
.s-breadcrumb a{color:var(--s-muted)}
.s-breadcrumb a:hover{color:var(--s-accent)}
.s-hero h1{font-size:clamp(2rem,4.5vw,3rem);font-weight:800;line-height:1.1;letter-spacing:-.02em;color:var(--s-heading);max-width:18ch}
.s-hero h1 .hl{background:linear-gradient(120deg,var(--s-primary),var(--s-accent));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.s-hero__lead{margin-top:18px;font-size:1.12rem;max-width:62ch;color:var(--s-text)}
.s-hero__actions{margin-top:28px;display:flex;flex-wrap:wrap;gap:14px}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;border-radius:999px;padding:13px 24px;font-size:.98rem;transition:all .2s;border:1px solid transparent;cursor:pointer}
.btn--primary{background:linear-gradient(135deg,var(--s-primary),var(--s-accent));color:#fff;box-shadow:0 8px 28px rgba(98,140,144,.35)}
.btn--primary:hover{transform:translateY(-2px);color:#fff}
.btn--ghost{border-color:var(--s-border-strong);color:var(--s-heading)}
.btn--ghost:hover{background:rgba(107,158,167,.12);color:#fff}

/* Layout */
.s-main{max-width:var(--s-max);margin:0 auto;padding:56px 24px}
.s-section{margin-bottom:52px}
.s-section h2{font-size:clamp(1.4rem,3vw,1.9rem);font-weight:800;color:var(--s-heading);letter-spacing:-.02em;margin-bottom:16px}
.s-section h3{font-size:1.15rem;font-weight:700;color:var(--s-heading);margin:24px 0 10px}
.s-section p{margin-bottom:16px}
.s-section ul{margin:0 0 16px 0;list-style:none}
.s-section ul li{position:relative;padding-left:28px;margin-bottom:10px}
.s-section ul li::before{content:"";position:absolute;left:0;top:10px;width:10px;height:10px;border-radius:3px;background:linear-gradient(135deg,var(--s-primary),var(--s-accent))}
.s-section strong{color:var(--s-heading)}

/* Feature grid */
.s-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:8px}
.s-card{background:var(--s-surface);border:1px solid var(--s-border);border-radius:var(--s-radius);padding:22px}
.s-card:hover{border-color:var(--s-border-strong)}
.s-card h3{margin:0 0 6px;font-size:1.05rem;color:var(--s-heading)}
.s-card p{margin:0;font-size:.95rem;color:var(--s-muted)}
@media(max-width:640px){.s-grid{grid-template-columns:1fr}}

/* Normativa / highlight box */
.s-box{background:linear-gradient(135deg,rgba(98,140,144,.12),rgba(107,158,167,.06));border:1px solid var(--s-border-strong);border-radius:var(--s-radius);padding:22px 24px}
.s-box h3{margin-top:0}
.s-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.s-tag{font-size:.8rem;font-weight:600;color:var(--s-accent);background:rgba(107,158,167,.12);border:1px solid rgba(107,158,167,.25);padding:5px 12px;border-radius:999px}

/* FAQ */
.s-faq details{border:1px solid var(--s-border);border-radius:12px;padding:0 20px;margin-bottom:12px;background:var(--s-surface)}
.s-faq summary{list-style:none;cursor:pointer;padding:18px 0;font-weight:700;color:var(--s-heading);display:flex;justify-content:space-between;align-items:center;gap:12px}
.s-faq summary::-webkit-details-marker{display:none}
.s-faq summary::after{content:"+";font-size:1.4rem;color:var(--s-accent);transition:transform .2s}
.s-faq details[open] summary::after{transform:rotate(45deg)}
.s-faq details p{padding:0 0 18px;margin:0;color:var(--s-text)}

/* CTA band */
.s-cta{background:linear-gradient(135deg,rgba(98,140,144,.18),rgba(15,23,42,.6));border:1px solid var(--s-border-strong);border-radius:20px;padding:40px 28px;text-align:center;margin-bottom:52px}
.s-cta h2{font-size:clamp(1.4rem,3vw,1.9rem);color:var(--s-heading);margin-bottom:10px}
.s-cta p{color:var(--s-text);margin-bottom:22px}
.s-cta__actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}

/* Otros servicios */
.s-related{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.s-related a{background:var(--s-surface);border:1px solid var(--s-border);border-radius:12px;padding:14px 16px;color:var(--s-text);font-weight:600;font-size:.92rem}
.s-related a:hover{border-color:var(--s-border-strong);color:var(--s-accent)}
@media(max-width:760px){.s-related{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.s-related{grid-template-columns:1fr}}

/* Footer */
.s-footer{border-top:1px solid var(--s-border);background:var(--s-bg2)}
.s-footer__in{max-width:var(--s-max);margin:0 auto;padding:30px 24px;display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;font-size:.9rem;color:var(--s-muted)}
.s-footer__links{display:flex;flex-wrap:wrap;gap:18px}

/* WhatsApp FAB */
.whatsapp-fab{position:fixed;bottom:26px;right:26px;width:56px;height:56px;background:#25D366;color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 24px rgba(37,211,102,.45);z-index:1000;transition:transform .2s}
.whatsapp-fab:hover{transform:translateY(-3px) scale(1.05);color:#fff}