/* BERT sandbox site - shared styles. Brand palette from 2026 BERT data sheets. */
:root{--navy:#0d2237;--teal:#004e6b;--accent:#00707a;--mist:#eaf2f5;--line:#d5e4e9;--ink:#1c2a36;--muted:#5a6b78;--white:#fff;--warn:#8a5a00;--warnbg:#fff4dc}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);line-height:1.6;font-size:17px;background:#fff}
a{color:var(--accent)}
img{max-width:100%;height:auto}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px;z-index:9}
/* header */
.site-header{background:var(--navy);position:sticky;top:0;z-index:50}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:72px}
.brand img{height:40px;width:auto;display:block}
.nav{display:flex;flex-wrap:wrap;gap:4px 22px;align-items:center}
.nav a{color:#cfe0e8;text-decoration:none;font-size:15px;font-weight:600}
.nav a:hover,.nav a[aria-current=page]{color:#fff}
.nav .btn{color:#fff}
/* buttons */
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;font-weight:700;padding:12px 22px;border-radius:6px;border:2px solid var(--accent)}
.btn:hover{background:#005a62;border-color:#005a62}
.btn.ghost{background:transparent;color:#fff;border-color:#9fc3cf}
.btn.ghost.dark{color:var(--teal);border-color:var(--teal)}
/* hero */
.hero{background:linear-gradient(135deg,var(--navy),var(--teal));color:#fff;padding:88px 0 80px}
.hero.small{padding:64px 0 56px}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:13px;font-weight:700;color:#8fd3d9;margin:0 0 12px}
.hero h1{font-size:clamp(34px,5vw,56px);line-height:1.1;margin:0 0 20px;max-width:880px}
.hero.small h1{font-size:clamp(30px,4vw,44px)}
.hero p.lede{font-size:20px;max-width:760px;color:#dbe9ef;margin:0 0 28px}
.hero .actions{display:flex;flex-wrap:wrap;gap:14px}
/* sections */
section.band{padding:72px 0}
section.band.mist{background:var(--mist)}
section.band.dark{background:var(--navy);color:#fff}
section.band.dark p{color:#dbe9ef}
h2{font-size:clamp(26px,3vw,36px);line-height:1.2;margin:0 0 16px;color:var(--navy)}
.dark h2{color:#fff}
h3{font-size:20px;margin:0 0 8px;color:var(--teal)}
.dark h3{color:#8fd3d9}
.intro{max-width:780px;color:var(--muted);font-size:18px;margin:0 0 36px}
.dark .intro{color:#cfe0e8}
.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:28px}
.card p{margin:0 0 12px}
.card .more{font-weight:700;text-decoration:none}
.door{border-top:5px solid var(--accent)}
.stat{font-size:44px;font-weight:800;color:var(--teal);line-height:1}
.dark .stat{color:#8fd3d9}
.stat-label{color:var(--muted);font-size:15px;margin-top:8px}
.dark .stat-label{color:#cfe0e8}
.src{font-size:13px;color:var(--muted)}
.dark .src{color:#9fb8c4}
.src a{color:inherit}
.proof{display:flex;flex-wrap:wrap;gap:12px 32px;align-items:center;justify-content:center;color:var(--teal);font-weight:700;font-size:17px}
.split{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:center}
.product-img{background:var(--mist);border-radius:10px;padding:24px;text-align:center}
.product-img{display:flex;align-items:center;justify-content:center;padding:16px}
.product-img img{width:100%;max-width:420px;aspect-ratio:4/3;object-fit:contain}
.card .product-img{margin:-8px -8px 18px}
ol.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:18px}
ol.steps li{counter-increment:s;padding-left:56px;position:relative}
ol.steps li:before{content:counter(s);position:absolute;left:0;top:0;width:38px;height:38px;border-radius:50%;background:var(--accent);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center}
table.spec{width:100%;border-collapse:collapse;font-size:15px}
table.spec th,table.spec td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
table.spec th{background:var(--mist);color:var(--navy);width:34%}
table.compare th{width:auto}
.notice{background:var(--warnbg);border-left:5px solid #d99a00;padding:16px 20px;border-radius:6px;color:#4a3500;margin:0 0 24px}
.chain{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.chain > div{padding:24px;background:#fff;border-right:1px solid var(--line)}
.chain > div:last-child{border-right:0;background:var(--teal);color:#fff}
.chain > div:last-child .stat,.chain > div:last-child .stat-label{color:#fff}
details.faq{border-bottom:1px solid var(--line);padding:18px 0}
details.faq summary{font-weight:700;font-size:18px;cursor:pointer;color:var(--navy)}
details.faq p{margin:12px 0 0;color:var(--ink)}
.cta-band{background:var(--accent);color:#fff;padding:56px 0}
.cta-band h2{color:#fff}
.cta-band p{color:#e3f4f5;max-width:720px}
.cta-band .actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:20px}
.cta-band .btn{background:#fff;color:var(--teal);border-color:#fff}
.cta-band .btn.ghost{background:transparent;color:#fff}
.crumbs{font-size:14px;color:#9fc3cf;margin:0 0 18px}
.crumbs a{color:#cfe0e8}
ul.check{list-style:none;padding:0;margin:0}
ul.check li{padding-left:28px;position:relative;margin:0 0 10px}
ul.check li:before{content:"\2713";position:absolute;left:0;color:var(--accent);font-weight:800}
.tag{display:inline-block;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;background:var(--mist);color:var(--teal);padding:3px 10px;border-radius:20px;margin-bottom:10px}
/* footer */
.site-footer{background:var(--navy);color:#9fb8c4;padding:56px 0 32px;font-size:15px}
.site-footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.site-footer h4{color:#fff;margin:0 0 12px;font-size:15px;text-transform:uppercase;letter-spacing:.08em}
.site-footer a{color:#cfe0e8;text-decoration:none;display:block;margin:0 0 8px}
.site-footer .legal{border-top:1px solid #23405a;margin-top:36px;padding-top:20px;font-size:13px}
@media (max-width:1024px){.g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(2,1fr)}.chain{grid-template-columns:repeat(2,1fr)}.site-footer .cols{grid-template-columns:1fr 1fr}}
@media (max-width:760px){.site-header{position:static}.site-header .wrap{flex-wrap:wrap;padding-top:12px;padding-bottom:10px}.nav{width:100%;flex-wrap:nowrap;overflow-x:auto;gap:18px;padding-bottom:4px}.nav a{white-space:nowrap}.nav{scrollbar-width:none;-webkit-overflow-scrolling:touch}.nav::-webkit-scrollbar{display:none}.g2,.g3,.g4,.split,.chain{grid-template-columns:1fr}.chain > div{border-right:0;border-bottom:1px solid var(--line)}.hero{padding:56px 0}section.band{padding:52px 0}.site-footer .cols{grid-template-columns:1fr}}
.band.mist .product-img{background:#fff}
.shot{margin:32px 0 0}.shot img{width:100%;height:auto;display:block;border-radius:10px;border:1px solid var(--line);box-shadow:0 10px 30px rgba(0,0,0,.12)}.shot figcaption{font-size:.85rem;color:#667;margin-top:10px}
.scene{width:100%;height:auto;display:block;border-radius:10px;margin-bottom:20px;aspect-ratio:16/9;object-fit:cover}