/* ARK-BAU Oy — modern stylesheet (vanilla CSS) */
:root{
  --blue:#0C6DDA;          /* logon sininen */
  --blue-dark:#0954A8;
  --navy:#15263A;          /* tumma pohja (alkuperäisen #324964 pohjalta) */
  --navy-2:#324964;
  --ink:#1B2430;
  --muted:#5A6573;
  --line:#E2E7EE;
  --bg:#FFFFFF;
  --bg-alt:#F4F6F9;
  --radius:4px;
  --shadow:0 1px 2px rgba(21,38,58,.06),0 8px 24px rgba(21,38,58,.07);
  --font-head:"Archivo",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --font-body:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --container:1180px;
  --header-h:72px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px);-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font-body);font-size:1.0625rem;line-height:1.65;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--blue-dark)}
h1,h2,h3{font-family:var(--font-head);color:var(--navy);line-height:1.15;margin:0 0 .6em;letter-spacing:-.01em}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0}
address{font-style:normal}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.skip-link{position:absolute;left:-9999px;top:8px;background:var(--navy);color:#fff;padding:.6rem 1rem;z-index:100}
.skip-link:focus{left:8px;color:#fff}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-family:var(--font-head);font-weight:600;font-size:1rem;letter-spacing:.01em;padding:.85rem 1.5rem;border-radius:var(--radius);border:2px solid transparent;text-decoration:none;cursor:pointer;transition:background .2s,color .2s,border-color .2s,transform .2s;line-height:1.2}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark);color:#fff}
.btn-ghost{background:transparent;color:var(--navy);border-color:var(--navy)}
.btn-ghost:hover{background:var(--navy);color:#fff}
.btn-light{background:#fff;color:var(--navy)}
.btn-light:hover{background:#E8F1FC;color:var(--navy)}
.btn-outline-light{border-color:rgba(255,255,255,.6);color:#fff}
.btn-outline-light:hover{background:#fff;color:var(--navy);border-color:#fff}
.btn-sm{padding:.55rem 1rem;font-size:.92rem}
.btn-block{width:100%}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:saturate(180%) blur(10px);-webkit-backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line);transition:box-shadow .2s}
.site-header.is-scrolled{box-shadow:0 4px 20px rgba(21,38,58,.08)}
.nav-bar{display:flex;align-items:center;justify-content:space-between;min-height:var(--header-h);gap:1rem}
.brand{display:flex;align-items:center;gap:.75rem;text-decoration:none;color:var(--navy)}
.brand-logo{width:40px;height:40px;flex:none}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-name{font-family:var(--font-head);font-weight:800;font-size:1.25rem;letter-spacing:.04em}
.brand-sub{font-size:.75rem;color:var(--muted);letter-spacing:.02em}
.nav-menu{list-style:none;display:flex;align-items:center;gap:.25rem}
.nav-menu a{display:block;padding:.55rem .75rem;font-family:var(--font-head);font-weight:600;font-size:.95rem;color:var(--ink);text-decoration:none;border-radius:var(--radius);position:relative}
.nav-menu a:not(.btn)::after{content:"";position:absolute;left:.75rem;right:.75rem;bottom:.3rem;height:2px;background:var(--blue);transform:scaleX(0);transform-origin:left;transition:transform .2s}
.nav-menu a:not(.btn):hover::after,.nav-menu a.is-active::after{transform:scaleX(1)}
.nav-menu a.is-active{color:var(--blue)}
.nav-cta{margin-left:.5rem}
.nav-menu .btn{color:#fff}
.nav-toggle{display:none;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:var(--radius);cursor:pointer;align-items:center;justify-content:center}
.nav-toggle-bars,.nav-toggle-bars::before,.nav-toggle-bars::after{display:block;width:20px;height:2px;background:var(--navy);position:relative;transition:transform .25s,background .25s}
.nav-toggle-bars::before,.nav-toggle-bars::after{content:"";position:absolute;left:0}
.nav-toggle-bars::before{top:-6px}.nav-toggle-bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-6px) rotate(-45deg)}

@media (max-width:1040px){
  .nav-toggle{display:inline-flex}
  .nav{position:fixed;inset:var(--header-h) 0 auto 0;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 20px 40px rgba(21,38,58,.12);transform:translateY(-8px);opacity:0;visibility:hidden;transition:opacity .2s,transform .2s,visibility .2s;max-height:calc(100vh - var(--header-h));overflow:auto}
  .nav.is-open{opacity:1;visibility:visible;transform:none}
  .nav-menu{flex-direction:column;align-items:stretch;padding:.75rem 24px 1.25rem;gap:0}
  .nav-menu a{padding:.9rem .25rem;font-size:1.05rem;border-bottom:1px solid var(--line);border-radius:0}
  .nav-menu a:not(.btn)::after{display:none}
  .nav-cta{margin:1rem 0 0}
  .nav-menu .btn{width:100%;border-bottom:0;padding:.9rem;border-radius:var(--radius)}
}
@media (max-width:420px){.brand-sub{display:none}}

/* Common sections */
.section{padding:88px 0}
.section-alt{background:var(--bg-alt)}
.eyebrow{font-family:var(--font-head);font-weight:600;font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);margin:0 0 .9rem;display:flex;align-items:center;gap:.6rem}
.eyebrow::before{content:"";width:24px;height:2px;background:currentColor}
.section-title{font-size:clamp(1.7rem,3vw,2.4rem);font-weight:700}
.section-head{margin-bottom:40px;max-width:720px}
.section-head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:1.5rem;max-width:none;flex-wrap:wrap}
.section-head-row .section-title{margin-bottom:0}
.prose p{color:#3A4552}
.prose-lead{font-size:1.125rem;color:#3A4552}

/* Hero */
.hero{position:relative;padding:72px 0 56px;overflow:hidden;
  background:
    linear-gradient(rgba(12,109,218,.06) 1px,transparent 1px) 0 0/48px 48px,
    linear-gradient(90deg,rgba(12,109,218,.06) 1px,transparent 1px) 0 0/48px 48px,
    linear-gradient(180deg,#F7FAFE 0%,#fff 100%)}
.hero-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(2.1rem,4.4vw,3.5rem);font-weight:800;margin-bottom:.45em}
.hero-lead{font-size:1.2rem;color:#3A4552;max-width:34rem}
.hero-actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.75rem}
.hero-media{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:12px}
.hero-media img{width:100%}
.stats{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);margin-top:56px;border:1px solid var(--line);background:#fff;border-radius:var(--radius)}
.stats li{padding:22px 24px;border-left:1px solid var(--line)}
.stats li:first-child{border-left:0}
.stats strong{display:block;font-family:var(--font-head);font-size:clamp(1.6rem,2.6vw,2.1rem);font-weight:800;color:var(--navy);line-height:1.1}
.stats span{font-size:.92rem;color:var(--muted)}

/* Page hero (subpages) */
.page-hero{padding:72px 0 56px;border-bottom:1px solid var(--line);
  background:
    linear-gradient(rgba(12,109,218,.06) 1px,transparent 1px) 0 0/48px 48px,
    linear-gradient(90deg,rgba(12,109,218,.06) 1px,transparent 1px) 0 0/48px 48px,
    #F7FAFE}
.page-hero h1{font-size:clamp(2rem,4vw,3.1rem);font-weight:800}
.page-lead{font-size:1.15rem;color:#3A4552;max-width:46rem;margin-bottom:1.5rem}

/* Intro */
.intro-grid{display:grid;grid-template-columns:1fr 1.5fr;gap:56px;align-items:start}

/* Cards */
.card-grid{display:grid;gap:28px}
.card-grid-2{grid-template-columns:repeat(2,1fr)}
.card-grid-3{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .25s,transform .25s,border-color .25s}
.card-media{display:block;aspect-ratio:640/385;overflow:hidden;background:var(--bg-alt);border-bottom:1px solid var(--line)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.card-body{padding:26px 28px 30px;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:1.4rem}
.card-body h3 a{color:var(--navy);text-decoration:none}
.card-body h3 a::after{content:"";position:absolute;inset:0}
.card-link{position:relative}
.card-link:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:#CFD8E3}
.card-link:hover .card-media img{transform:scale(1.04)}
.card-body p{color:#3A4552}
.card-more{margin-top:auto;font-family:var(--font-head);font-weight:600;color:var(--blue);display:inline-flex;align-items:center;gap:.4rem}
.card-more::after{content:"→";transition:transform .2s}
.card-link:hover .card-more::after{transform:translateX(4px)}
.card-title{font-size:1.3rem;font-weight:700}
.card-num{font-family:var(--font-head);font-weight:700;font-size:.85rem;color:var(--blue);letter-spacing:.1em;margin-bottom:.4rem}
.tags{list-style:none;display:flex;flex-wrap:wrap;gap:.45rem}
.tags li{font-size:.88rem;padding:.3rem .65rem;background:var(--bg-alt);border:1px solid var(--line);border-radius:999px;color:#34404D}


/* Tiles */
.tile-grid{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.tile a{display:flex;flex-direction:column;gap:.35rem;height:100%;padding:26px 28px;background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:var(--radius);text-decoration:none;transition:box-shadow .25s,transform .25s}
.tile a:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.tile-title{font-family:var(--font-head);font-weight:700;font-size:1.2rem;color:var(--navy)}
.tile-sub{color:var(--muted);font-size:.95rem}

/* CTA */
.cta-band{background:var(--navy);color:#fff;padding:64px 0;position:relative;overflow:hidden}
.cta-band::after{content:"";position:absolute;inset:0;background:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px) 0 0/48px 48px,linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px) 0 0/48px 48px;pointer-events:none}
.cta-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:center;position:relative;z-index:1}
.cta-band h2{color:#fff;font-size:clamp(1.7rem,3vw,2.3rem)}
.cta-band p{color:#C9D3DF;margin:0;max-width:38rem}
.cta-actions{display:flex;gap:.75rem;flex-wrap:wrap;justify-content:flex-end}

/* Muut palvelut */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split-media{margin:0;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.service-list{list-style:none;border-top:1px solid var(--line)}
.service-list li{display:flex;align-items:baseline;gap:1.25rem;padding:24px 0;border-bottom:1px solid var(--line)}
.service-num{font-family:var(--font-head);font-weight:700;color:var(--blue);font-size:.95rem;letter-spacing:.1em}
.service-name{font-family:var(--font-head);font-weight:700;font-size:clamp(1.35rem,2.4vw,1.8rem);color:var(--navy)}

/* Referenssit */
.jump-nav{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.5rem}
.jump-nav a{font-family:var(--font-head);font-weight:600;font-size:.92rem;padding:.5rem .95rem;border:1px solid #C8D3E0;border-radius:999px;background:#fff;color:var(--navy);text-decoration:none;transition:all .2s}
.jump-nav a:hover{background:var(--navy);color:#fff;border-color:var(--navy)}
.ref-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px;align-items:start}
.ref-group{background:#fff;border:1px solid var(--line);border-top:4px solid var(--blue);border-radius:var(--radius);padding:28px 30px 30px}
.ref-group-wide{grid-column:1/-1}
.ref-group-tall{grid-row:span 2}
.ref-head h2{font-size:1.5rem;margin-bottom:1rem}
.ref-sub{font-size:1.02rem;font-weight:700;color:var(--blue);margin:1.25rem 0 .5rem}
.ref-head + .ref-sub{margin-top:0}
.ref-list{list-style:none}
.ref-list li{padding:.5rem 0 .5rem 1.25rem;border-bottom:1px dashed var(--line);position:relative;color:#34404D}
.ref-list li:last-child{border-bottom:0}
.ref-list li::before{content:"";position:absolute;left:0;top:1.05rem;width:7px;height:7px;background:var(--blue);border-radius:1px}
.ref-list-cols{columns:3 240px;column-gap:32px}
.ref-list-cols li{break-inside:avoid}

/* Partners */
.partner-grid{list-style:none;display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.partner{display:flex;flex-direction:column;justify-content:space-between;gap:1.5rem;min-height:140px;padding:26px 28px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);text-decoration:none;transition:box-shadow .25s,transform .25s,border-color .25s}
.partner:hover{box-shadow:var(--shadow);transform:translateY(-2px);border-color:var(--blue)}
.partner-name{font-family:var(--font-head);font-weight:700;font-size:1.25rem;color:var(--navy)}
.partner-url{font-size:.92rem;color:var(--blue)}
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.25rem}
.chips li{padding:.6rem 1.1rem;background:#fff;border:1px solid var(--line);border-radius:var(--radius);font-weight:500;color:var(--navy)}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:40px;align-items:start}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px}
.contact-card address{font-size:1.1rem;margin-bottom:1.25rem;color:#34404D}
.contact-lines{list-style:none;border-top:1px solid var(--line)}
.contact-lines li{display:grid;grid-template-columns:130px 1fr;gap:1rem;padding:.8rem 0;border-bottom:1px solid var(--line)}
.contact-lines .label{font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:600;padding-top:.15rem}
.people{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.people-stack{grid-template-columns:1fr}
.contact-actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.5rem}
.contact-card{border-top:4px solid var(--blue);box-shadow:var(--shadow)}
.person{display:flex;flex-direction:column;gap:.2rem;padding:22px 24px;background:var(--bg-alt);border-radius:var(--radius);border:1px solid var(--line)}
.person-role{font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;color:var(--blue);font-weight:600}
.person-name{font-family:var(--font-head);font-weight:700;font-size:1.2rem;color:var(--navy)}
.map-section{border-top:1px solid var(--line)}
.map-frame{position:relative;height:420px;background:var(--bg-alt)}
.map-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0;filter:grayscale(.3)}

/* Footer */
.site-footer{background:#0F1C2B;color:#B7C2CF;padding:64px 0 0;font-size:.95rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
.brand-footer{color:#fff}
.brand-footer .brand-sub{color:#8C9AAB}
.footer-lead{margin-top:1rem;max-width:20rem}
.footer-title{color:#fff;font-size:.85rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:1rem}
.footer-list{list-style:none;line-height:1.9}
.site-footer a{color:#DCE4ED;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.footer-bottom{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-top:48px;padding-top:22px;padding-bottom:22px;border-top:1px solid rgba(255,255,255,.1);font-size:.85rem;color:#8C9AAB}
.footer-bottom p{margin:0}

/* Reveal */
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
.js .reveal.is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
  .js .reveal{opacity:1;transform:none}
}

/* Responsive */
@media (max-width:960px){
  .hero-grid,.intro-grid,.split,.contact-grid,.cta-grid{grid-template-columns:1fr;gap:32px}
  .card-grid-3{grid-template-columns:repeat(2,1fr)}
  .tile-grid{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .stats li:nth-child(3){border-left:0}
  .stats li:nth-child(n+3){border-top:1px solid var(--line)}
  .cta-actions{justify-content:flex-start}
  .footer-grid{grid-template-columns:1fr 1fr}
  .ref-grid{grid-template-columns:1fr}
  .ref-group-tall{grid-row:auto}
}
@media (max-width:640px){
  body{font-size:1rem}
  .section{padding:60px 0}
  .hero{padding:44px 0 40px}
  .page-hero{padding:48px 0 40px}
  .card-grid-2,.card-grid-3,.tile-grid{grid-template-columns:1fr}
  .people{grid-template-columns:1fr}
  .contact-lines li{grid-template-columns:1fr;gap:.15rem}
  .contact-card{padding:24px}
  .footer-grid{grid-template-columns:1fr}
  .hero-actions .btn{flex:1 1 auto}
  .map-frame{height:320px}
}