/* ISC — Industrias y Servicios de Coahuila · prototipo de rediseño */
:root{
  --blue:#2491eb; --blue-700:#1670bd; --green:#65b63d; --green-700:#4b9a27;
  --ink:#0f1b2a; --ink-2:#22313f; --muted:#5b6b7b; --line:#e3e8ee; --bg:#f5f7fa; --white:#fff;
  --radius:14px; --shadow:0 10px 30px rgba(15,27,42,.08);
  --max:1200px;
  --font:Inter,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink-2);background:var(--white);line-height:1.6;font-size:1.0625rem}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue-700)}
a:hover{color:var(--ink)}
h1,h2,h3,h4{color:var(--ink);line-height:1.15;margin:0 0 .6em;letter-spacing:-.015em}
h1{font-size:clamp(2rem,4.6vw,3.5rem);font-weight:800}
h2{font-size:clamp(1.6rem,3vw,2.4rem);font-weight:800}
h3{font-size:1.25rem;font-weight:700}
p{margin:0 0 1em}
.container{width:min(100% - 2.5rem,var(--max));margin-inline:auto}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:.75rem 1rem;z-index:100}
.skip:focus{left:1rem;top:1rem}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:4px}
.eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-size:.8rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--green-700);margin-bottom:.9rem}
.eyebrow::before{content:"";width:28px;height:3px;background:linear-gradient(90deg,var(--blue),var(--green));border-radius:3px}
.lead{font-size:1.2rem;color:var(--muted);max-width:62ch}
.ph{background:#fff4c2;color:#6b4e00;border:1px dashed #d9a400;border-radius:6px;padding:.05em .4em;font-weight:600;font-size:.92em}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.85rem 1.4rem;border-radius:999px;font-weight:700;text-decoration:none;border:2px solid transparent;transition:transform .15s,background .15s,color .15s;font-size:1rem;cursor:pointer;font-family:inherit}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--green);color:#fff}
.btn-primary:hover{background:var(--green-700);color:#fff}
.btn-ghost{border-color:rgba(255,255,255,.6);color:#fff}
.btn-ghost:hover{background:#fff;color:var(--ink)}
.btn-outline{border-color:var(--ink);color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:#fff}
.btn svg{width:20px;height:20px}

/* Header */
.topbar{background:var(--ink);color:#c9d4df;font-size:.875rem}
.topbar .container{display:flex;justify-content:space-between;gap:1rem;padding:.45rem 0;flex-wrap:wrap}
.topbar a{color:#fff;text-decoration:none}
.topbar a:hover{text-decoration:underline}
.topbar span{display:inline-flex;gap:1.2rem;flex-wrap:wrap}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:76px}
.brand{display:flex;align-items:center;gap:.75rem;text-decoration:none;color:var(--ink)}
.brand img{height:48px;width:auto}
.brand small{display:block;font-size:.72rem;line-height:1.25;color:var(--muted);font-weight:600;max-width:15ch;border-left:1px solid var(--line);padding-left:.75rem}
.nav ul{list-style:none;margin:0;padding:0;display:flex;align-items:center;gap:.25rem}
.nav a{display:block;padding:.6rem .8rem;text-decoration:none;color:var(--ink-2);font-weight:600;font-size:.97rem;border-radius:8px}
.nav a:hover,.nav a[aria-current="page"]{color:var(--blue-700);background:#eef6fe}
.nav .btn{margin-left:.5rem;padding:.65rem 1.1rem;color:#fff}
.nav .btn:hover{background:var(--green-700);color:#fff}
.menu-toggle{display:none;background:none;border:0;padding:.5rem;cursor:pointer;color:var(--ink)}
.menu-toggle svg{width:28px;height:28px}
@media (max-width:1020px){
  .menu-toggle{display:block}
  .nav{position:fixed;inset:76px 0 auto 0;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow);display:none;max-height:calc(100vh - 76px);overflow:auto}
  .nav.open{display:block}
  .nav ul{flex-direction:column;align-items:stretch;padding:1rem}
  .nav a{padding:.9rem 1rem;font-size:1.05rem}
  .nav .btn{margin:.5rem 0 0}
  .brand small{display:none}
}

/* Hero */
.hero{position:relative;color:#fff;background:var(--ink);overflow:hidden;isolation:isolate}
.hero picture,.hero>img{position:absolute;inset:0;z-index:-2}
.hero picture img,.hero>img{width:100%;height:100%;object-fit:cover}
.hero::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(100deg,rgba(10,22,36,.92) 0%,rgba(10,22,36,.75) 45%,rgba(10,22,36,.25) 100%)}
.hero .container{padding:clamp(4rem,10vw,8rem) 0 clamp(3.5rem,8vw,6rem)}
.hero h1{color:#fff;max-width:20ch}
.hero .lead{color:#d7e1ea;max-width:52ch}
.hero .actions{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.8rem}
.hero .eyebrow{color:#9fdc7f}
.trust{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);margin-top:-2.5rem;position:relative}
.trust div{background:#fff;padding:1.3rem 1.5rem;display:flex;gap:.9rem;align-items:flex-start}
.trust svg{flex:0 0 34px;width:34px;height:34px;color:var(--green)}
.trust strong{display:block;color:var(--ink);font-size:1.02rem}
.trust span{color:var(--muted);font-size:.93rem}
@media (max-width:1100px){.trust{grid-template-columns:repeat(2,1fr)}}@media (max-width:640px){.trust{grid-template-columns:1fr;margin-top:-1.5rem}}

.page-hero{background:var(--ink);color:#fff;position:relative;isolation:isolate;overflow:hidden}
.page-hero .container{padding:clamp(3rem,7vw,5rem) 0}
.page-hero h1{color:#fff;font-size:clamp(1.9rem,4vw,3rem);max-width:24ch}
.page-hero .lead{color:#d7e1ea}
.page-hero picture{position:absolute;inset:0;z-index:-2}
.page-hero picture img{width:100%;height:100%;object-fit:cover}
.page-hero::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(100deg,rgba(10,22,36,.94),rgba(10,22,36,.7))}
.page-hero .eyebrow{color:#9fdc7f}
.crumbs{font-size:.88rem;color:#aebccb;margin-bottom:1rem}
.crumbs a{color:#fff}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:.4rem;margin:0;padding:0}
.crumbs li+li::before{content:"/";margin-right:.4rem;color:#6f8396}

/* Sections */
.section{padding:clamp(3.5rem,7vw,6rem) 0}
.section.alt{background:var(--bg)}
.section.dark{background:var(--ink);color:#d7e1ea}
.section.dark h2,.section.dark h3{color:#fff}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:2rem;flex-wrap:wrap;margin-bottom:2.5rem}
.section-head p{max-width:58ch;margin:0;color:var(--muted)}
.grid{display:grid;gap:1.5rem}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:980px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:clamp(2rem,5vw,4rem);align-items:center}
@media (max-width:900px){.split{grid-template-columns:1fr}}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .2s,transform .2s}
.card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.card .media{aspect-ratio:4/3;overflow:hidden;background:#dfe6ec}
.card .media img{width:100%;height:100%;object-fit:cover}
.card .body{padding:1.25rem 1.35rem 1.5rem;display:flex;flex-direction:column;gap:.4rem;flex:1}
.card .tag{font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--blue-700)}
.card h3{margin:0;font-size:1.15rem}
.card h3 a{color:inherit;text-decoration:none}
.card h3 a::after{content:"";position:absolute;inset:0}
.card{position:relative}
.card p{color:var(--muted);font-size:.97rem;margin:0}
.card .more{margin-top:auto;padding-top:.6rem;font-weight:700;color:var(--green-700);font-size:.95rem}

.feature-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.feature-img img{width:100%;aspect-ratio:4/3;object-fit:cover}
.stack-img{position:relative}
.stack-img .small{position:absolute;right:-1rem;bottom:-2rem;width:48%;border:6px solid #fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
@media (max-width:900px){.stack-img .small{right:.5rem;bottom:-1.5rem}}

.mv{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
@media (max-width:900px){.mv{grid-template-columns:1fr}}
.mv article{background:#fff;border-radius:var(--radius);padding:1.8rem;border-top:4px solid var(--blue);box-shadow:var(--shadow)}
.mv article:nth-child(2){border-color:var(--green)}
.mv article:nth-child(3){border-color:var(--ink)}
.mv h3{font-size:.85rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.mv .big{font-size:1.3rem;font-weight:800;color:var(--ink);line-height:1.3}

.checks{list-style:none;padding:0;margin:1rem 0 0;display:grid;gap:.7rem}
.checks li{position:relative;padding-left:2rem}
.checks li::before{content:"";position:absolute;left:0;top:.3em;width:1.2rem;height:1.2rem;border-radius:50%;background:var(--green) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12l5 5L20 7'/%3E%3C/svg%3E") center/70% no-repeat}

.clients{display:flex;flex-wrap:wrap;gap:1.5rem 3rem;align-items:center;justify-content:center}
.clients img{height:64px;width:auto;filter:grayscale(1);opacity:.8;transition:.2s}
.clients img:hover{filter:none;opacity:1}

.cta-band{background:linear-gradient(110deg,var(--blue-700),var(--blue) 45%,var(--green));color:#fff;border-radius:calc(var(--radius) + 6px);padding:clamp(2rem,5vw,3.5rem);display:flex;justify-content:space-between;align-items:center;gap:2rem;flex-wrap:wrap}
.cta-band h2{color:#fff;margin:0 0 .3rem}
.cta-band p{margin:0;color:#eaf4ff}
.cta-band .actions{display:flex;gap:.8rem;flex-wrap:wrap}
.cta-band .btn-primary{background:#fff;color:var(--ink)}
.cta-band .btn-primary:hover{background:var(--ink);color:#fff}

/* Sedes */
.sede{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;display:flex;flex-direction:column;gap:.5rem}
.sede .badge{align-self:flex-start;background:#eaf6e2;color:var(--green-700);font-size:.72rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;padding:.25rem .6rem;border-radius:999px}
.sede h3{margin:0}
.sede address{font-style:normal;color:var(--muted);font-size:.97rem}
.sede a{font-weight:700;font-size:.95rem}
.map{border:0;width:100%;height:420px;border-radius:var(--radius);background:#e5ebf0}
.mini-map{border:0;width:100%;height:220px;border-radius:10px;background:#e5ebf0;margin-top:.5rem}

/* Gallery */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1rem}
.gallery figure{margin:0;background:#fff;border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.gallery button{all:unset;cursor:zoom-in;display:block;width:100%}
.gallery button:focus-visible{outline:3px solid var(--blue)}
.gallery img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .3s}
.gallery figure:hover img{transform:scale(1.03)}
.gallery figcaption{padding:.7rem .9rem;font-size:.88rem;color:var(--muted)}
dialog.lightbox{border:0;padding:0;background:transparent;max-width:min(96vw,1400px);max-height:94vh}
dialog.lightbox::backdrop{background:rgba(5,12,20,.9)}
dialog.lightbox img{max-height:86vh;width:auto;margin:auto;border-radius:8px}
dialog.lightbox p{color:#fff;text-align:center;margin:.6rem 0 0;font-size:.95rem}
dialog.lightbox .close{position:fixed;top:1rem;right:1rem;background:#fff;border:0;border-radius:50%;width:44px;height:44px;font-size:1.6rem;cursor:pointer;line-height:1}

/* Certs */
.cert{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem;display:flex;flex-direction:column;gap:.6rem}
.cert .icon{width:52px;height:52px;border-radius:12px;display:grid;place-items:center;background:#eef6fe;color:var(--blue-700)}
.cert .icon svg{width:28px;height:28px}
.cert dl{margin:.4rem 0 0;display:grid;grid-template-columns:auto 1fr;gap:.35rem .8rem;font-size:.93rem}
.cert dt{font-weight:700;color:var(--ink)}
.cert dd{margin:0}

/* Forms */
.form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:clamp(1.4rem,3vw,2.2rem);box-shadow:var(--shadow)}
.form .row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media (max-width:640px){.form .row{grid-template-columns:1fr}}
.field{display:flex;flex-direction:column;gap:.35rem;margin-bottom:1rem}
.field label{font-weight:700;font-size:.92rem;color:var(--ink)}
.field input,.field select,.field textarea{font:inherit;font-size:1rem;padding:.8rem .9rem;border:1.5px solid #cfd8e1;border-radius:10px;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--blue);outline:3px solid rgba(36,145,235,.2)}
.field textarea{min-height:140px;resize:vertical}
.check{display:flex;gap:.6rem;align-items:flex-start;font-size:.92rem;margin:.4rem 0 1.2rem}
.check input{margin-top:.3rem;width:18px;height:18px;accent-color:var(--green)}
.hp{position:absolute;left:-9999px}
.form-msg{margin-top:1rem;padding:1rem;border-radius:10px;background:#eef6fe;color:var(--ink);display:none}
.form-msg.show{display:block}
.contact-list{list-style:none;padding:0;margin:0;display:grid;gap:1rem}
.contact-list li{display:flex;gap:1rem;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:12px;padding:1rem 1.2rem}
.contact-list svg{width:26px;height:26px;color:var(--blue);flex:0 0 26px;margin-top:.15rem}
.contact-list a{font-weight:800;font-size:1.15rem;color:var(--ink);text-decoration:none}
.contact-list a:hover{color:var(--blue-700);text-decoration:underline}
.contact-list small{display:block;color:var(--muted)}

.prose{max-width:75ch}
.prose h2{font-size:1.5rem;margin-top:2rem}
.prose h3{margin-top:1.4rem}
.notice{background:#fff8e1;border:1px solid #f0c94a;border-left:6px solid #e0a800;padding:1rem 1.2rem;border-radius:10px;margin-bottom:2rem;color:#5a4300}

/* Footer */
.site-footer{background:#0a1624;color:#aebccb;font-size:.95rem;padding:4rem 0 0}
.site-footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:2rem}
@media (max-width:900px){.site-footer .cols{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.site-footer .cols{grid-template-columns:1fr}}
.site-footer h2{color:#fff;font-size:.85rem;letter-spacing:.14em;text-transform:uppercase;margin-bottom:1rem}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:.5rem}
.site-footer a{color:#dbe4ec;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.site-footer .brand img{height:56px}
.site-footer .bottom{border-top:1px solid #1d2c3c;margin-top:3rem;padding:1.3rem 0;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.85rem}

.service-nav{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.5rem}
.service-nav a{background:rgba(255,255,255,.1);color:#fff;text-decoration:none;padding:.45rem .9rem;border-radius:999px;font-size:.88rem;font-weight:600;border:1px solid rgba(255,255,255,.2)}
.service-nav a:hover,.service-nav a[aria-current="page"]{background:#fff;color:var(--ink)}
.supply{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
@media (max-width:900px){.supply{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media (max-width:640px){.topbar .container>span:first-child{display:none}.topbar .container{justify-content:center}.clients img{height:52px}}
.split>*{min-width:0}
.split.contact{grid-template-columns:1fr 1.5fr}
@media (max-width:900px){.split.contact{grid-template-columns:1fr}}
.form .row>*{min-width:0}
.field input,.field select,.field textarea{width:100%;max-width:100%}
.gallery.g3{grid-template-columns:repeat(3,1fr)}@media (max-width:900px){.gallery.g3{grid-template-columns:repeat(2,1fr)}}@media (max-width:560px){.gallery.g3{grid-template-columns:1fr}}