/* Coscatl — Sitio Solar. Cero dependencias externas, solo HTML+CSS+JS propios. */
:root{
  --brand:#1b5e7f; --brand-dark:#12465f; --sky:#8fc3e0; --sky-soft:#e3f0f7;
  --accent:#e8a33d; --ink:#1c2b33; --muted:#5b6f79; --bg:#ffffff;
  --surface:#f3f7f9; --border:#d8e3e9; --radius:14px;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);line-height:1.65;background:var(--bg)}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand)}
.container{max-width:1120px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
.center{text-align:center}
.muted{color:var(--muted);font-size:.92rem}
.skip-link{position:absolute;left:-999px;top:0;background:var(--brand);color:#fff;padding:10px 16px;z-index:99;border-radius:0 0 8px 0}
.skip-link:focus{left:0}
/* header */
.site-header{position:sticky;top:0;background:rgba(255,255,255,.96);border-bottom:1px solid var(--border);z-index:50}
.site-header .container{display:flex;align-items:center;gap:20px;padding-top:10px;padding-bottom:10px}
.brand-logo{width:280px;height:auto}
/* faq + índice de metodología */
.toc{display:flex;gap:10px;flex-wrap:wrap;list-style:none;padding:0;margin:18px 0 0}
.toc a{display:inline-block;padding:8px 16px;border:1px solid var(--brand);border-radius:999px;text-decoration:none;font-weight:600;font-size:.9rem}
.toc a:hover{background:var(--sky-soft)}
details{border:1px solid var(--border);border-radius:10px;padding:14px 18px;margin-bottom:12px;background:#fff}
details summary{font-weight:700;cursor:pointer;color:var(--brand-dark)}
details summary:hover{color:var(--brand)}
.nav-desktop{display:flex;gap:20px;margin-left:auto}
.nav-desktop a{text-decoration:none;color:var(--ink);font-weight:600;font-size:.95rem}
.nav-desktop a:hover,.nav-desktop a[aria-current]{color:var(--brand)}
.header-cta{margin-left:8px;display:flex;align-items:center;gap:10px}
.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;padding:8px;cursor:pointer}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0}
.nav-mobile{display:none;flex-direction:column;background:#fff;border-bottom:1px solid var(--border)}
.nav-mobile a{padding:12px 20px;text-decoration:none;color:var(--ink);font-weight:600;border-top:1px solid var(--surface)}
.nav-mobile.open{display:flex}
/* buttons */
.btn{display:inline-block;text-decoration:none;font-weight:700;padding:12px 24px;border-radius:12px;border:2px solid transparent;cursor:pointer}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark)}
.btn-outline{border-color:var(--brand);color:var(--brand)}
.btn-outline:hover{background:var(--sky-soft)}
.btn-small{padding:8px 16px;font-size:.88rem}
/* hero */
.hero{background:linear-gradient(180deg,var(--sky-soft),#fff);padding:56px 0}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:36px;align-items:center}
.hero h1{font-size:clamp(1.9rem,4vw,2.9rem);line-height:1.15;margin:.2em 0}
.lede{font-size:1.15rem;color:var(--brand-dark)}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}
.hero-media img{border-radius:var(--radius);box-shadow:0 12px 32px rgba(18,70,95,.18)}
/* sections */
.section-pad{padding:56px 0}
.section-pad.alt{background:var(--surface)}
.section-head{max-width:720px;margin-bottom:28px}
.eyebrow{display:inline-block;text-transform:uppercase;letter-spacing:.08em;font-size:.78rem;font-weight:800;color:var(--brand);margin-bottom:8px}
.section-head h2,.page-hero h1{font-size:clamp(1.5rem,3vw,2.1rem);margin:.2em 0}
.page-hero{background:linear-gradient(180deg,var(--sky-soft),#fff);padding:44px 0 28px}
/* cards & grids */
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));gap:20px}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.section-pad.alt .card{border-color:transparent}
.card h3{margin-top:0}
.card-link{font-weight:700;text-decoration:none}
.product img{border-radius:8px;margin-bottom:12px;aspect-ratio:4/3;object-fit:cover;width:100%}
.price{font-weight:800;color:var(--brand);font-size:1.15rem}
.price.big{font-size:1.6rem}
/* blog cards con miniatura */
.post-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr));gap:20px}
.post-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.post-card img{aspect-ratio:16/9;object-fit:cover;width:100%}
.post-card>div{padding:18px 20px 22px}
.post-card h2{font-size:1.08rem;margin:0 0 6px;line-height:1.4}
.post-card h2 a{text-decoration:none;color:var(--ink)}
.post-card h2 a:hover{color:var(--brand)}
.post-card p{margin:.4em 0;font-size:.93rem}
/* video fachada */
.video-facade{position:relative;display:block;width:100%;aspect-ratio:16/9;border:0;padding:0;cursor:pointer;background:#0b1c24;border-radius:10px;overflow:hidden}
.video-facade img{width:100%;height:100%;object-fit:cover}
.video-facade .play{position:absolute;inset:0;margin:auto;width:64px;height:64px;border-radius:50%;background:rgba(27,94,127,.92);color:#fff;font-size:22px;display:flex;align-items:center;justify-content:center}
.video-facade:hover .play{background:var(--accent)}
.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
/* legacy list (por si se usa) */
.post-item{padding:20px 0;border-bottom:1px solid var(--border)}
.post-item h2{font-size:1.25rem;margin:0 0 4px}
.post-item h2 a{text-decoration:none;color:var(--ink)}
.post-item h2 a:hover{color:var(--brand)}
/* content */
.content-list{padding-left:22px}
.content-list li{margin-bottom:6px}
.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));gap:14px;margin-top:24px}
.gallery figure{margin:0}
.gallery img{border-radius:10px;aspect-ratio:4/3;object-fit:cover;width:100%}
.cover{margin:0 0 24px}
.cover img{border-radius:var(--radius)}
.cta-row{margin-top:28px}
.video-wrap{position:relative;aspect-ratio:16/9;background:#000;border-radius:10px;overflow:hidden;margin-bottom:12px}
.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
/* footer */
.site-footer{background:var(--brand-dark);color:#dce9ef;margin-top:0}
.site-footer a{color:#fff}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,200px),1fr));gap:24px;padding:44px 0 20px}
.footer-col h5{text-transform:uppercase;font-size:.75rem;letter-spacing:.08em;color:var(--sky);margin:0 0 10px}
.footer-col ul{list-style:none;margin:0;padding:0}
.footer-col li{margin-bottom:6px}
.footer-bottom{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.2);padding:16px 0 22px;font-size:.85rem}
.solar-note{opacity:.75}
.back-to-top{position:fixed;right:16px;bottom:16px;width:44px;height:44px;border-radius:50%;border:1px solid var(--border);background:#fff;color:var(--brand);font-size:20px;cursor:pointer;display:none;box-shadow:0 4px 14px rgba(0,0,0,.15)}
.back-to-top.show{display:block}
@media (max-width:820px){
  .brand-logo{width:200px}
  .nav-desktop{display:none}
  .nav-toggle{display:block}
  .hero-grid{grid-template-columns:1fr}
  .header-cta{margin-left:auto}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.post-cats,.post-tags,.post-share{margin-top:18px;font-size:.92rem;color:var(--muted,#555)}
.post-cats span{display:inline-block}
.post-tags a{display:inline-block;margin:0 10px 6px 0;font-weight:600}
.post-gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;margin-top:24px}
.post-gallery img{width:100%;height:100%;aspect-ratio:4/3;object-fit:cover;border-radius:10px}
/* Header like the editor site's (Sitio Solar, palette Océano): same sizes, colors and pill button. */
.site-header{background:#f4f8fb;border-bottom:1px solid #dbe5ee;font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
.site-header .container{max-width:1120px;padding:0 24px;min-height:68px;display:flex;align-items:center;gap:16px}
.site-header .brand-logo{height:56px;width:auto}
.site-header .nav-desktop{flex:1;justify-content:center;align-items:center;gap:22px}
.site-header .nav-desktop a{color:#0f2a3d;font-weight:500;font-size:.98rem;text-decoration:none;white-space:nowrap;padding:0}
.site-header .nav-desktop a[aria-current=page]{color:#1f6fa8;box-shadow:inset 0 -2px 0 #1f6fa8}
.site-header .header-cta .btn{background:#1f6fa8;border:2px solid #1f6fa8;color:#fff;border-radius:999px;padding:8px 18px;font-size:.92rem;font-weight:600;white-space:nowrap}
@media (max-width:819px){.site-header .brand-logo{height:48px}}