/* STILE DEL SITO - colori in :root, poi layout */
:root{--bg:#fff;--alt:#f3f4f6;--ink:#161a21;--mute:#5a6270;--blue:#03316b;--line:#e2e5ea;--dark:#12161d;--darkline:#2a313c;--on-dark:#f2f4f7;--mute-dark:#a9b1bd;box-sizing:border-box}
*,*::before,*::after{box-sizing:inherit}
html{scroll-behavior:smooth;scroll-padding-top:4.5rem}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.0625rem/1.65 "Work Sans",system-ui,-apple-system,"Segoe UI",sans-serif}
a{color:inherit}img{max-width:100%;height:auto;display:block}
:focus-visible{outline:3px solid #6fa3e8;outline-offset:3px}
.wrap{max-width:72rem;margin:0 auto;padding:0 1.5rem}
.logo{display:inline-block;background:currentColor;-webkit-mask:url(assets/logo-mask.png) center/contain no-repeat;mask:url(assets/logo-mask.png) center/contain no-repeat;aspect-ratio:480/434}
/* intestazione */
header{position:sticky;top:0;z-index:10;background:var(--dark);color:var(--on-dark)}
header .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:4.2rem}
.brand{display:flex;align-items:center;gap:.7rem;font-weight:700;font-size:1.15rem;text-decoration:none}
.brand .logo{width:34px}
nav ul{list-style:none;display:flex;gap:.3rem;margin:0;padding:0;align-items:center}
nav li{position:relative}
nav a.top{display:block;padding:1.4rem .8rem;font-size:.95rem;text-decoration:none;color:var(--mute-dark)}
nav li:hover>a.top,nav li:focus-within>a.top{color:#fff}
.sub{display:none;position:absolute;left:0;top:100%;min-width:17rem;background:#fff;color:var(--ink);border-top:3px solid var(--blue);box-shadow:0 12px 30px rgba(0,0,0,.18);padding:.5rem 0}
li:hover>.sub,li:focus-within>.sub{display:block}
.sub a{display:block;padding:.55rem 1.1rem;text-decoration:none;font-size:.95rem}.sub a:hover{background:var(--alt)}
.lang{border:1px solid var(--darkline);border-radius:2px;padding:.3rem .6rem!important;margin-left:.6rem;font-size:.85rem!important}
/* hero */
.hero{position:relative;color:#fff;background:linear-gradient(90deg,rgba(12,16,22,.86) 0%,rgba(12,16,22,.6) 55%,rgba(12,16,22,.25) 100%),url(assets/ponte-busan.jpg) center/cover;min-height:82vh;display:flex;align-items:center;padding:5rem 0}
.eyebrow{font-size:.8rem;letter-spacing:.16em;text-transform:uppercase;font-weight:700;margin:0 0 1rem;color:var(--blue)}
.hero .eyebrow,.dark .eyebrow{color:#9ec2f2}
h1{font-size:clamp(2.4rem,5.4vw,4.4rem);line-height:1.04;margin:0 0 1.4rem;font-weight:700;letter-spacing:-.02em;max-width:17ch}
.lead{font-size:1.25rem;max-width:36rem;margin:0 0 2.2rem;opacity:.94}
.btns{display:flex;gap:1rem;flex-wrap:wrap}
.btn{display:inline-block;padding:.95rem 1.7rem;text-decoration:none;font-weight:700;border-radius:2px;border:2px solid transparent}
.btn.solid{background:#fff;color:var(--dark)}.btn.solid:hover{background:#dfe6f0}
.btn.line{border-color:#fff;color:#fff}.btn.line:hover{background:rgba(255,255,255,.14)}
.btn.blue{background:var(--blue);color:#fff}.btn.blue:hover{opacity:.9}
/* sezioni */
section{padding:5.5rem 0}
.alt{background:var(--alt)}
.dark{background:var(--dark);color:var(--on-dark)}
h2{font-size:clamp(1.8rem,3.4vw,2.6rem);line-height:1.12;margin:0 0 1.1rem;font-weight:700;letter-spacing:-.01em}
h3{font-size:1.1rem;margin:0 0 .4rem}
p{margin:0 0 1rem;max-width:41rem}
.intro{color:var(--mute);font-size:1.12rem}.dark .intro{color:var(--mute-dark)}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:4rem;align-items:center}
.services{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:3rem}
.services>div{background:var(--bg);padding:1.8rem 1.5rem}
.services img{width:52px;height:52px;margin-bottom:1rem}
.services p{color:var(--mute);font-size:.96rem;margin:0}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:2rem;margin-top:3rem;counter-reset:s}
.steps>div{border-top:3px solid var(--blue);padding-top:1.1rem}
.steps b{display:block;font-size:2.6rem;line-height:1;color:var(--blue);margin-bottom:.7rem;font-weight:700}
.steps p{color:var(--mute);font-size:.98rem}
.about{display:grid;grid-template-columns:minmax(0,22rem) 1fr;gap:4rem;align-items:center}
.about figcaption{font-size:.92rem;color:var(--mute);margin-top:.6rem}.about figure{margin:0}
.mission{border-left:3px solid var(--blue);padding-left:1.1rem;font-weight:500;margin-top:1.6rem}
.nums{display:grid;grid-template-columns:repeat(4,1fr);gap:2rem;text-align:left}
.nums div{border-left:1px solid var(--darkline);padding-left:1.4rem}
.nums b{display:block;font-size:clamp(2.4rem,4.5vw,3.6rem);line-height:1;font-weight:700;color:#fff}
.nums span{display:block;margin-top:.6rem;color:var(--mute-dark);font-size:.98rem}
.pair{display:grid;grid-template-columns:1fr .66fr;gap:1rem;height:26rem}.pair img{width:100%;height:100%;object-fit:cover}
.facts{list-style:none;margin:1.6rem 0 0;padding:0;display:grid;gap:1.2rem}
.facts li{border-top:1px solid var(--line);padding-top:.9rem}.facts p{color:var(--mute);font-size:.98rem;margin:0}
.glass{width:100%;height:100%;object-fit:cover;min-height:22rem}
.faq{max-width:48rem;margin-top:2rem}
.faq details{border-top:1px solid var(--line);padding:1rem 0}.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;font-weight:700;font-size:1.05rem}.faq details p{margin:.7rem 0 0;color:var(--mute)}
/* contatti */
.cinfo a{display:block;text-decoration:none;font-size:1.15rem;padding:.45rem 0;border-bottom:1px solid var(--darkline)}
.cinfo a:hover{color:#9ec2f2}
form{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
form .full{grid-column:1/-1}
label{display:block;font-size:.88rem;color:var(--mute-dark);margin-bottom:.3rem}
input,textarea{width:100%;font:inherit;padding:.75rem .8rem;background:#1b212b;border:1px solid var(--darkline);color:#fff;border-radius:2px}
input:focus,textarea:focus{border-color:#6fa3e8;outline:none}
.check{display:flex;gap:.6rem;align-items:flex-start;font-size:.9rem;color:var(--mute-dark)}.check input{width:auto;margin-top:.3rem}
.check label{margin:0}
form button{font:inherit;cursor:pointer}
footer{background:#0c0f14;color:var(--mute-dark);padding:3.5rem 0 2rem;font-size:.95rem}
.fcols{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.2fr;gap:2.5rem}
footer h4{color:#fff;margin:0 0 .8rem;font-size:.95rem}footer ul{list-style:none;margin:0;padding:0}footer li{margin:.35rem 0}footer a{text-decoration:none}footer a:hover{color:#fff}
.copy{border-top:1px solid var(--darkline);margin-top:2.5rem;padding-top:1.2rem;font-size:.86rem}
@media(max-width:60rem){.services,.steps,.nums{grid-template-columns:repeat(2,1fr)}.fcols{grid-template-columns:1fr 1fr}}
@media(max-width:46rem){.split,.about{grid-template-columns:1fr;gap:2rem}.about figure{max-width:16rem}.services,.steps,.nums,.fcols{grid-template-columns:1fr}form{grid-template-columns:1fr}.pair{height:18rem}
header .wrap{flex-wrap:wrap;padding-top:.6rem;padding-bottom:.4rem}nav{width:100%;overflow-x:auto}nav ul{width:max-content}nav a.top{padding:.7rem .7rem}.sub{display:none!important}section{padding:3.5rem 0}.hero{min-height:70vh;padding:3rem 0}}

/* nuove sezioni */
.sub-h{font-size:clamp(1.2rem,2.2vw,1.6rem);font-weight:500;margin:0 0 1rem;opacity:.95}
.two-col{display:grid;grid-template-columns:1fr 1.1fr;gap:4rem;align-items:start}
.list8{list-style:none;margin:1.2rem 0 0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:0 3rem}
.list8 li{border-top:1px solid var(--line);padding:1rem 0 1rem 1.6rem;position:relative;font-weight:500}
.list8 li::before{content:"";position:absolute;left:0;top:1.55rem;width:.7rem;height:.7rem;background:var(--blue)}
.note{color:var(--mute);margin-top:1.5rem;font-size:.98rem;max-width:48rem}
@media(max-width:46rem){.two-col,.list8{grid-template-columns:1fr;gap:1.5rem}}

.route{display:block;width:100%;max-width:56rem;margin:2.2rem 0 0;color:var(--blue)}
.band{background:linear-gradient(rgba(12,16,22,.86),rgba(12,16,22,.86)),url(assets/facciata-vetro.jpg) center/cover;padding:4.5rem 0}
.nums{grid-template-columns:repeat(auto-fit,minmax(13rem,1fr))}
.one img{width:100%;height:30rem;object-fit:cover}.cap{font-size:.92rem;color:var(--mute);margin:.6rem 0 0}
#servizi .glass{height:34rem;min-height:0}
@media(max-width:46rem){.one img{height:18rem}#servizi .glass{height:22rem}}

@media(min-width:46.01rem){.steps{grid-template-columns:repeat(2,1fr);gap:2.8rem 4rem}}
.steps h3{font-size:1.2rem;line-height:1.3}.steps p{max-width:none}
.src{margin:2.2rem 0 0;font-size:.82rem;color:var(--mute-dark);max-width:none}
.facts .n{color:var(--blue);margin-right:.2rem}
.facts.wide{grid-template-columns:1fr 1fr;gap:1.6rem 4rem;margin-top:2.4rem}
@media(max-width:46rem){.facts.wide{grid-template-columns:1fr}}

.faqwrap{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:4.5rem}
.faqhead{position:sticky;top:6rem}
.faq{margin-top:0;max-width:none}
.faq details{border-top:1px solid #cfd4db;padding:0}
.faq details:last-child{border-bottom:1px solid #cfd4db}
.faq summary{list-style:none;display:flex;justify-content:space-between;gap:1.5rem;align-items:center;padding:1.3rem 0;font-size:1.1rem;line-height:1.35}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.7rem;font-weight:400;line-height:1;color:var(--blue);flex:none}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:0 0 1.4rem;max-width:40rem;color:var(--mute)}
@media(max-width:60rem){.faqwrap{grid-template-columns:1fr;gap:2rem}.faqhead{position:static}}

/* pagina coreana: due percorsi */
.paths{display:grid;grid-template-columns:1fr 1fr;gap:1.6rem;margin-top:2.4rem}
.paths>div{border:1px solid var(--line);padding:2rem 1.8rem;background:var(--bg)}
.paths .tag{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.06em;color:var(--blue);border:1px solid var(--blue);padding:.2rem .6rem;margin-bottom:1rem}
.paths h3{font-size:1.25rem;margin-bottom:.6rem}
.paths p{color:var(--mute);font-size:.98rem;margin:0}
@media(max-width:46rem){.paths{grid-template-columns:1fr}}