/* ===== SIMET-USACH · estilos compartidos ===== */
:root{
  --slate:#394049;--slate-deep:#2b3138;--ink:#0f172a;
  --teal:#00a499;--teal-dark:#008b82;--blue:#498bca;
  --text:#454f5e;--heading:#2b3138;
  --bg:#f4f6f8;--surface:#ffffff;--line:#e3e8ed;
  --radius:14px;--shadow:0 14px 40px -16px rgba(43,49,56,.28);--shadow-sm:0 6px 22px -12px rgba(43,49,56,.3);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Open Sans',Helvetica,Arial,sans-serif;color:var(--text);background:var(--surface);line-height:1.65;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4,h5{font-family:'Montserrat',sans-serif;color:var(--heading);line-height:1.2;letter-spacing:-.01em}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 26px}
.eyebrow{display:inline-block;font-size:.76rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--teal)}
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 26px;border-radius:6px;font-weight:600;font-size:.93rem;font-family:'Montserrat';transition:.25s;cursor:pointer;border:none}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-dark);transform:translateY(-2px)}
.btn-light{background:transparent;color:#fff;border:1.6px solid rgba(255,255,255,.4)}
.btn-light:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn-outline{background:transparent;color:var(--slate);border:1.6px solid var(--line)}
.btn-outline:hover{border-color:var(--teal);color:var(--teal)}

/* TOP BAR */
.topbar{display:none;background:var(--ink);color:#aeb8c4;font-size:.82rem}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:38px;gap:18px}
.topbar a{color:#aeb8c4;transition:.2s}
.topbar a:hover{color:var(--teal)}
.topbar .social{display:flex;gap:14px}

/* NAV */
header{position:sticky;top:0;z-index:100;background:var(--slate);box-shadow:0 2px 18px rgba(0,0,0,.18)}
.nav{display:flex;align-items:center;justify-content:space-between;height:78px}
.brand{display:flex;align-items:center;gap:13px;color:#fff}
.brand img{height:60px;width:auto}
.brand .txt{font-family:'Montserrat';font-weight:800;font-size:1.4rem;letter-spacing:.02em;line-height:1}
.brand .txt small{display:block;font-weight:500;font-size:.66rem;letter-spacing:.18em;color:var(--teal);margin-top:3px}
.nav-links{display:flex;align-items:center;gap:30px;list-style:none}
.nav-links a{font-family:'Montserrat';font-size:.9rem;font-weight:600;color:#e7ecf1;position:relative;padding:8px 0;transition:.2s}
.nav-links a::after{content:'';position:absolute;left:0;bottom:0;width:0;height:2.5px;background:var(--teal);transition:.25s}
.nav-links a:hover{color:#fff}
.nav-links a:hover::after{width:100%}
.nav-links a.active{color:#fff}
.nav-links a.active::after{width:100%}
.menu-toggle{display:none;background:none;border:none;cursor:pointer;font-size:1.7rem;color:#fff}
.brand{order:0}
header .nav>nav{order:1}
.brand-simet{order:2;display:flex;align-items:center}
.brand-simet img{height:48px;width:auto}
.menu-toggle{order:3}
@media(max-width:680px){.brand-simet{display:none}}

/* HERO (home) */
.hero{position:relative;color:#fff;background:linear-gradient(rgba(20,25,31,.82),rgba(43,49,56,.9)),url('https://metalurgia.usach.cl/wp-content/uploads/2025/10/IMG_1296.jpg') center/cover}
.hero::after{content:'';position:absolute;left:0;bottom:0;width:100%;height:6px;background:linear-gradient(90deg,var(--teal),var(--blue))}
.hero .wrap{position:relative;padding:108px 26px 116px;max-width:880px}
.hero h1{color:#fff;font-size:clamp(2.3rem,5.2vw,3.7rem);font-weight:800;margin:16px 0 22px}
.hero h1 .hl{color:var(--teal)}
.hero p{font-size:1.14rem;color:#d7dee6;max-width:640px;margin-bottom:34px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}

/* STRIP */
.strip{background:var(--slate-deep);color:#fff}
.strip .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.strip .item{padding:30px 24px;text-align:center;border-right:1px solid rgba(255,255,255,.08)}
.strip .item:last-child{border-right:none}
.strip .num{font-family:'Montserrat';font-size:2.1rem;font-weight:800;color:var(--teal);line-height:1}
.strip .lbl{font-size:.86rem;color:#c2cad3;margin-top:8px}

section{padding:84px 0}
.sec-head{max-width:680px;margin:0 auto 52px;text-align:center}
.sec-head h2{font-size:clamp(1.9rem,3.4vw,2.5rem);font-weight:800;margin:14px 0 12px}
.sec-head .bar{width:64px;height:4px;background:var(--teal);border-radius:4px;margin:0 auto 20px}
.sec-head p{color:var(--text);font-size:1.05rem}

/* ACREDITACIONES */
.acred{background:var(--bg)}
.acred-row{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.acred-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:30px 24px;text-align:center;transition:.3s}
.acred-item:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-top:3px solid var(--teal)}
.acred-item img{height:110px;width:auto;object-fit:contain;margin:0 auto 18px}
.acred-item .role{font-family:'Montserrat';font-weight:700;font-size:.95rem;color:var(--heading)}
.acred-item .sub{font-size:.84rem;color:var(--text);margin-top:4px}
.acred-item .ex-ic{margin:0 auto 16px;background:rgba(0,164,153,.12)}

/* SERVICIOS */
.services{display:grid;grid-template-columns:repeat(2,1fr);gap:26px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);transition:.3s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.card-img{position:relative;height:200px;overflow:hidden;background:var(--slate)}
.card-img img{width:100%;height:100%;object-fit:cover;transition:.55s}
.card:hover .card-img img{transform:scale(1.07)}
.card-img::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(15,23,42,.35))}
.card-num{position:absolute;top:0;left:0;background:var(--teal);color:#fff;font-family:'Montserrat';font-weight:700;font-size:.86rem;padding:7px 14px;border-bottom-right-radius:12px;z-index:2}
.tag-ext{position:absolute;bottom:12px;right:12px;z-index:2;font-family:'Montserrat';font-size:.66rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#fff;background:rgba(0,164,153,.92);padding:5px 10px;border-radius:5px;box-shadow:0 4px 12px rgba(0,0,0,.25)}
.card-body{padding:26px;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:1.24rem;font-weight:700;margin-bottom:11px}
.card-body p{color:var(--text);font-size:.96rem;margin-bottom:20px;flex:1}
.card-link{display:inline-flex;align-items:center;gap:8px;font-family:'Montserrat';font-weight:700;color:var(--teal);font-size:.9rem}
.card-link svg{transition:.25s}
.card-link:hover svg{transform:translateX(5px)}
.ex-ic{width:52px;height:52px;border-radius:12px;background:rgba(0,164,153,.18);display:flex;align-items:center;justify-content:center;margin-bottom:18px;color:var(--teal)}

/* CTA */
.cta{background:linear-gradient(115deg,var(--teal) 0%,var(--teal-dark) 55%,var(--slate) 120%);color:#fff;text-align:center}
.cta h2{color:#fff;font-size:2rem;font-weight:800;max-width:640px;margin:0 auto 12px}
.cta p{color:#e4f6f4;max-width:560px;margin:0 auto 28px}

/* FOOTER */
footer{background:var(--ink);color:#aeb8c4;padding:64px 0 26px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr;gap:60px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1)}
.foot-grid h4{color:#fff;font-family:'Montserrat';font-size:1rem;font-weight:700;margin-bottom:18px}
.foot-grid img{height:54px;margin-bottom:18px}
.foot-grid ul{list-style:none}
.foot-grid li{margin-bottom:5px;font-size:.92rem;line-height:1.4}
.foot-grid a:hover{color:var(--teal)}
.foot-grid p{font-size:.91rem;line-height:1.75}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:24px;font-size:.85rem;color:#7d8a98;flex-wrap:wrap;gap:12px}
.social{display:flex;gap:11px}
.social a{width:38px;height:38px;border-radius:9px;background:rgba(255,255,255,.07);display:flex;align-items:center;justify-content:center;transition:.25s}
.social a:hover{background:var(--teal)}

.reveal{opacity:0;transform:translateY(26px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ===== PÁGINAS DE DETALLE ===== */
.page-hero{position:relative;color:#fff;background:linear-gradient(rgba(15,23,42,.78),rgba(43,49,56,.92)),var(--hero-img,linear-gradient(135deg,#394049,#0f172a));background-size:cover;background-position:center}
.page-hero::after{content:'';position:absolute;left:0;bottom:0;width:100%;height:5px;background:linear-gradient(90deg,var(--teal),var(--blue))}
.page-hero .wrap{position:relative;padding:64px 26px 70px}
.crumb{font-size:.86rem;color:#bcc6d0;margin-bottom:14px}
.crumb a{color:#bcc6d0}
.crumb a:hover{color:var(--teal)}
.crumb span{color:var(--teal)}
.page-hero h1{color:#fff;font-size:clamp(2rem,4.4vw,3rem);font-weight:800;margin-bottom:14px}
.page-hero p{color:#d7dee6;font-size:1.08rem;max-width:760px}

.detail{padding:70px 0}
.detail-grid{display:grid;grid-template-columns:280px 1fr;gap:48px;align-items:start}
.side{position:sticky;top:96px;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.side h4{font-family:'Montserrat';font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);margin-bottom:16px}
.side ul{list-style:none}
.side li{margin-bottom:2px}
.side a{display:block;padding:9px 12px;border-radius:7px;font-size:.92rem;font-weight:600;color:var(--heading);transition:.2s}
.side a:hover{background:#fff;color:var(--teal)}
.side a.current{background:var(--teal);color:#fff}
.side a.back{color:var(--teal-dark);font-weight:700;border-bottom:1px solid var(--line);border-radius:0;margin-bottom:6px;padding-left:0}
.side a.back:hover{background:transparent;color:var(--teal)}

.prose{max-width:760px}
.prose h2{font-size:1.5rem;font-weight:800;margin:34px 0 14px;color:var(--heading)}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:1.12rem;font-weight:700;color:var(--slate);margin:24px 0 8px}
.prose p{margin-bottom:16px}
.prose ul{margin:0 0 18px 0;padding-left:0;list-style:none}
.prose ul li{position:relative;padding-left:26px;margin-bottom:9px}
.prose ul li::before{content:'';position:absolute;left:0;top:9px;width:8px;height:8px;border-radius:2px;background:var(--teal)}
.prose strong{color:var(--heading)}
.callout{background:var(--bg);border-left:4px solid var(--teal);border-radius:0 10px 10px 0;padding:18px 22px;margin:22px 0;font-size:.97rem}

.chips{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 6px}
.chip{font-family:'Montserrat';font-size:.84rem;font-weight:600;color:var(--slate);background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:9px 16px;transition:.2s}
a.chip:hover{border-color:var(--teal);color:var(--teal)}

.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:26px 0}
.gallery img{width:100%;height:180px;object-fit:cover;border-radius:10px;border:1px solid var(--line)}
.detail-img{float:right;width:300px;max-width:42%;margin:0 0 16px 24px}
.detail-img img{width:100%;object-fit:cover;border-radius:12px;border:1px solid var(--line);display:block}
.prose h2,.detail-cta{clear:right}
@media(max-width:640px){.detail-img{float:none;width:100%;max-width:100%;margin:16px 0}}

.tablewrap{overflow-x:auto;margin:18px 0;border:1px solid var(--line);border-radius:12px}
table{border-collapse:collapse;width:100%;font-size:.9rem;min-width:680px}
thead th{background:var(--slate);color:#fff;font-family:'Montserrat';font-weight:600;text-align:left;padding:13px 14px}
tbody td{padding:12px 14px;border-top:1px solid var(--line);vertical-align:top}
tbody tr:nth-child(even){background:var(--bg)}
.notes{font-size:.82rem;color:var(--text);margin-top:10px}
.notes p{margin-bottom:6px}

.detail-cta{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:30px;margin-top:36px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.detail-cta h3{font-size:1.2rem;font-weight:700}
.detail-cta p{font-size:.93rem;margin-top:4px}

@media(max-width:920px){
  .services{grid-template-columns:1fr}
  .strip .wrap{grid-template-columns:1fr 1fr}
  .strip .item:nth-child(2){border-right:none}
  .foot-grid{grid-template-columns:1fr 1fr}
  .detail-grid{grid-template-columns:1fr}
  .side{position:static}
}
@media(max-width:680px){
  .topbar{display:none}
  .nav-links{position:fixed;inset:78px 0 auto 0;flex-direction:column;background:var(--slate);padding:24px;gap:18px;transform:translateY(-130%);transition:.35s;box-shadow:var(--shadow);z-index:99}
  .nav-links.open{transform:none}
  .menu-toggle{display:block}
  .acred-row,.strip .wrap{grid-template-columns:1fr}
  .strip .item{border-right:none;border-bottom:1px solid rgba(255,255,255,.08)}
  .foot-grid{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr 1fr}
  section{padding:60px 0}
}