/* B4 Energía — static site · identidad Opción B (navy / cobre / crema) */
:root {
  --bg: #0b0f14;
  --bg-2: #121820;
  --bg-3: #1a222d;
  --text: #f6f1e8;          /* crema — texto principal */
  --muted: #b0bac6;        /* neutro claro, AA sobre bg */
  --line: #2a3544;
  --navy: #162033;
  --accent: #c17a45;       /* cobre */
  --accent-2: #d4925e;     /* cobre claro (hover) */
  --accent-dark: #a56438;  /* cobre oscuro */
  --cream: #f6f1e8;
  --ok: #3dd68c;
  --whatsapp: #128c7e;     /* verde WhatsApp oscuro — AA con blanco */
  --whatsapp-bright: #25d366;
  --radius: 12px;
  --shadow: 0 8px 30px rgba(0,0,0,.35);
  --max: 1100px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .6em; font-weight: 700; color: var(--text); }
h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.85rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; color: var(--muted); }
ul, ol { color: var(--muted); padding-left: 1.2em; }
li { margin-bottom: .4em; }
strong { color: var(--text); }

.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11,15,20,.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: .7rem 0; flex-wrap: wrap;
}
.logo {
  display: inline-flex; align-items: center; gap: .7rem;
  color: var(--cream); text-decoration: none;
  line-height: 1.15;
}
.logo:hover { color: var(--cream); }
.logo-full {
  display: block; height: 72px; width: auto; max-width: none;
  margin: -6px 0;
}
.nav-links {
  display: flex; flex-wrap: wrap; align-items: center; gap: .35rem .9rem;
  list-style: none; margin: 0; padding: 0;
}
.nav-links a { color: var(--muted); font-size: .92rem; font-weight: 500; }
.nav-links a:hover { color: var(--accent-2); }
/* Specifidad mayor que .nav-links a para que el WA no herede muted */
.nav-links a.btn-wa,
.nav-links .btn-wa {
  color: #fff;
  background: var(--whatsapp);
}
.nav-links a.btn-wa:hover,
.nav-links .btn-wa:hover {
  color: #fff;
  filter: brightness(1.1);
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .7rem 1.15rem; border-radius: 999px; font-weight: 700; font-size: .95rem;
  border: 1px solid transparent; cursor: pointer; transition: .15s ease;
}
.btn-accent {
  background: var(--accent); color: var(--navy);
}
.btn-accent:hover { background: var(--accent-2); color: var(--navy); }
.btn-ghost {
  background: transparent; color: var(--text); border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-2); }
.btn-wa {
  background: var(--whatsapp); color: #fff;
}
.btn-wa:hover { filter: brightness(1.1); color: #fff; }
.btn-lg { padding: .9rem 1.4rem; font-size: 1rem; }

/* Hero */
.hero {
  padding: 3rem 0 2.5rem;
  background:
    radial-gradient(ellipse 80% 60% at 70% -10%, rgba(193,122,69,.16), transparent 55%),
    radial-gradient(ellipse 50% 40% at 10% 80%, rgba(22,32,51,.9), transparent 50%),
    var(--bg);
}
.hero-grid {
  display: grid; gap: 2rem; align-items: center;
}
@media (min-width: 860px) {
  .hero-grid { grid-template-columns: 1.2fr .8fr; gap: 3rem; }
}
.eyebrow {
  display: inline-flex; align-items: center; gap: .4rem;
  background: var(--bg-3); color: var(--accent-2); border: 1px solid var(--line);
  padding: .3rem .7rem; border-radius: 999px; font-size: .8rem; font-weight: 600;
  margin-bottom: 1rem;
}
.hero h1 { margin-bottom: .75rem; }
.hero .lead { font-size: 1.1rem; max-width: 38ch; margin-bottom: 1.5rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-bottom: 1.5rem; }
.trust {
  display: flex; flex-wrap: wrap; gap: .75rem 1.25rem; font-size: .88rem; color: var(--muted);
}
.trust span { display: inline-flex; align-items: center; gap: .4rem; }
.trust svg { color: var(--ok); flex-shrink: 0; }

.hero-card {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: calc(var(--radius) + 4px);
  padding: 1.4rem; box-shadow: var(--shadow);
}
.hero-card h2 { font-size: 1.1rem; margin-bottom: .9rem; color: var(--text); }
.hero-card ul { list-style: none; padding: 0; margin: 0 0 1.2rem; }
.hero-card li {
  display: flex; gap: .65rem; align-items: flex-start;
  padding: .55rem 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: .93rem;
}
.hero-card li:last-child { border-bottom: 0; }
.hero-card li svg { color: var(--accent); flex-shrink: 0; margin-top: .15rem; }

/* Sections */
.section { padding: 3rem 0; }
.section-alt { background: var(--bg-2); border-block: 1px solid var(--line); }
.section-head { margin-bottom: 1.75rem; max-width: 48ch; }
.section-head p { margin-bottom: 0; }

.grid-3 {
  display: grid; gap: 1rem;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--bg-3); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.25rem; transition: border-color .15s, transform .15s;
  height: 100%; display: flex; flex-direction: column;
}
a.card:hover { border-color: var(--accent); transform: translateY(-2px); color: inherit; }
.card-icon {
  width: 42px; height: 42px; border-radius: 10px;
  background: rgba(193,122,69,.14); color: var(--accent-2);
  display: grid; place-items: center; margin-bottom: .9rem;
}
.card h3 { margin-bottom: .4rem; color: var(--text); }
.card p { flex: 1; font-size: .93rem; margin-bottom: .9rem; }
.card .more { font-size: .88rem; font-weight: 600; color: var(--accent-2); }

.zones {
  display: flex; flex-wrap: wrap; gap: .6rem;
}
.zone-chip {
  background: var(--bg); border: 1px solid var(--line); color: var(--text);
  padding: .55rem 1rem; border-radius: 999px; font-size: .9rem; font-weight: 500;
}
a.zone-chip:hover { border-color: var(--accent); color: var(--accent-2); }

/* FAQ */
.faq { display: grid; gap: .75rem; }
.faq details {
  background: var(--bg-3); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1rem 1.15rem;
}
.faq summary {
  cursor: pointer; font-weight: 600; color: var(--text); list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; color: var(--accent); font-size: 1.3rem; font-weight: 400; line-height: 1;
}
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: .85rem 0 0; font-size: .95rem; }

/* CTA band */
.cta-band {
  background: linear-gradient(135deg, #1a1620 0%, var(--bg-3) 45%, #141c28 100%);
  border: 1px solid var(--line); border-radius: calc(var(--radius) + 4px);
  padding: 2rem 1.5rem; text-align: center;
}
.cta-band h2 { margin-bottom: .5rem; }
.cta-band p { max-width: 42ch; margin: 0 auto 1.25rem; }
.cta-band .btn { margin: .25rem; }

/* Page hero (inner) */
.page-hero {
  padding: 2.25rem 0 1.5rem;
  border-bottom: 1px solid var(--line);
  background: radial-gradient(ellipse 70% 80% at 90% 0%, rgba(193,122,69,.12), transparent 50%), var(--bg);
}
.breadcrumb {
  font-size: .85rem; color: var(--muted); margin-bottom: .85rem;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent-2); }
.breadcrumb span { margin: 0 .35rem; opacity: .5; }
.prose { max-width: 68ch; }
.prose h2 { margin-top: 1.75rem; }
.prose h3 { margin-top: 1.35rem; color: var(--text); }
.prose ul, .prose ol { margin-bottom: 1.1em; }
.callout {
  background: rgba(193,122,69,.10); border-left: 3px solid var(--accent);
  padding: 1rem 1.15rem; border-radius: 0 var(--radius) var(--radius) 0; margin: 1.25rem 0;
}
.callout p { margin: 0; color: var(--text); font-size: .95rem; }

.two-col {
  display: grid; gap: 2rem;
}
@media (min-width: 860px) {
  .two-col { grid-template-columns: 1.5fr .85fr; align-items: start; }
}
.side-box {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.25rem; position: sticky; top: 5rem;
}
.side-box h2 { font-size: 1.05rem; }
.side-box p { font-size: .9rem; }
.side-meta { list-style: none; padding: 0; margin: 1rem 0; font-size: .9rem; }
.side-meta li {
  display: flex; gap: .6rem; padding: .45rem 0; border-bottom: 1px solid var(--line);
  color: var(--muted);
}
.side-meta li:last-child { border-bottom: 0; }
.side-meta strong { color: var(--text); display: block; font-size: .8rem; font-weight: 600; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line); padding: 2.5rem 0 6rem; background: var(--bg-2);
}
.footer-grid {
  display: grid; gap: 1.75rem;
  grid-template-columns: 1fr;
}
@media (min-width: 700px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
}
.site-footer h3 { font-size: .95rem; margin-bottom: .75rem; color: var(--text); }
.site-footer p, .site-footer li { font-size: .9rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: .4em; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent-2); }
.footer-bottom {
  margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--line);
  font-size: .82rem; color: var(--muted); display: flex; flex-wrap: wrap; gap: .5rem 1.5rem;
  justify-content: space-between;
}

/* Floating WhatsApp — verde WhatsApp (AA con tono oscuro) */
.wa-float {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 60;
  display: inline-flex; align-items: center; gap: .55rem;
  background: var(--whatsapp); color: #fff !important;
  padding: .85rem 1.15rem; border-radius: 999px;
  font-weight: 700; box-shadow: 0 10px 30px rgba(18,140,126,.45);
  font-size: .95rem;
}
.wa-float:hover { filter: brightness(1.1); color: #fff !important; }
@media (max-width: 480px) {
  .wa-float .wa-label { display: none; }
  .wa-float { padding: .95rem; border-radius: 50%; }
}

/* Utils */
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.text-center { text-align: center; }

/* Logo en footer */
.site-footer .logo-full { height: 76px; margin: 0; }

/* Gancho: visita técnica sin cargo */
.hook-visita {
  display: inline-block; margin: 0 0 1.25rem; padding: .55rem .85rem;
  border: 1px solid rgba(193,122,69,.45); border-left: 3px solid var(--accent);
  border-radius: 10px; background: rgba(193,122,69,.08);
  color: var(--cream); font-size: .95rem; line-height: 1.45; max-width: 52ch;
}
.hook-visita strong { color: var(--accent-2); }
.side-box .hook-visita { display: block; margin: 0 0 1rem; font-size: .9rem; }

@media (max-width: 640px) {
  .logo-full { height: 58px; margin: -4px 0; }
  .site-footer .logo-full { height: 64px; }
  .nav { padding: .55rem 0; gap: .55rem; }
  .nav-links { gap: .25rem .65rem; }
  .nav-links a { font-size: .88rem; }
  .nav-links .btn-wa { padding: .55rem .95rem; font-size: .88rem; }
}