:root{
  --paper:#f6f8f9; --steel:#e1e8ec; --ink:#0e2233; --muted:#51626f;
  --cobalt:#2450c8; --cobalt-d:#1a3b9a; --line:#c9d3da; --white:#fff;
  --font:"Bahnschrift","DIN Alternate","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --wrap:1280px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--paper);line-height:1.65;font-size:17px}
h1,h2,h3{line-height:1.12;margin:0;letter-spacing:-.01em}
h1{font-size:clamp(2.4rem,5.2vw,4.4rem);font-weight:700}
h2{font-size:clamp(1.9rem,3.4vw,2.9rem);font-weight:700}
h3{font-size:1.15rem;font-weight:650}
p{margin:0 0 1.1em}
a{color:inherit}
.wrap{width:min(var(--wrap),100% - 48px);margin-inline:auto}
:focus-visible{outline:3px solid var(--cobalt);outline-offset:3px}

.btn{display:inline-block;background:var(--cobalt);color:#fff;text-decoration:none;border:0;padding:15px 28px;font:inherit;font-weight:600;cursor:pointer;border-radius:2px;transition:background .2s,transform .2s}
.btn:hover{background:var(--cobalt-d);transform:translateY(-2px)}
.btn-small{padding:9px 18px;font-size:.95rem}
.link{font-weight:600;text-decoration:none;border-bottom:2px solid var(--ink);padding-bottom:2px;transition:color .2s,border-color .2s}
.link:hover{color:var(--cobalt);border-color:var(--cobalt)}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(246,248,249,.97);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;min-height:76px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:700;letter-spacing:.04em;line-height:1.1}
.brand small{display:block;font-weight:500;font-size:.75rem;letter-spacing:.06em;color:var(--muted)}
.brand-mark{width:30px;height:30px;background:var(--ink);clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);position:relative}
.brand-mark::after{content:"";position:absolute;inset:8px;background:var(--cobalt)}
.nav{display:flex;align-items:center;gap:30px}
.nav a:not(.btn){text-decoration:none;font-weight:500;position:relative;padding:4px 0}
.nav a:not(.btn)::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--cobalt);transition:width .25s}
.nav a:not(.btn):hover::after{width:100%}
.nav-toggle{display:none;background:none;border:0;width:44px;height:44px;cursor:pointer;position:relative}
.nav-toggle span{position:absolute;left:10px;right:10px;height:2px;background:var(--ink);transition:transform .25s,top .25s}
.nav-toggle span:first-child{top:16px}.nav-toggle span:last-child{top:26px}
.nav-toggle[aria-expanded=true] span:first-child{top:21px;transform:rotate(45deg)}
.nav-toggle[aria-expanded=true] span:last-child{top:21px;transform:rotate(-45deg)}

/* Hero (one entrance sequence on load) */
.hero{padding:clamp(48px,7vw,104px) 0 clamp(56px,7vw,96px);background:linear-gradient(90deg,var(--paper) 55%,var(--steel) 55%)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(32px,5vw,80px);align-items:center}
.tag{display:inline-block;border-left:4px solid var(--cobalt);padding-left:12px;font-weight:600;color:var(--muted);margin-bottom:24px}
.lead{font-size:1.2rem;color:var(--muted);max-width:60ch;margin:26px 0 34px}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:28px}
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin:56px 0 0;border-top:2px solid var(--ink)}
.facts div{padding:16px 16px 0 0}
.facts div+div{padding-left:16px;border-left:1px solid var(--line)}
.facts dt{font-weight:700;font-size:1.2rem}
.facts dd{margin:4px 0 0;font-size:.9rem;color:var(--muted);line-height:1.4}
.drawing{margin:0;background:var(--white);border:2px solid var(--ink);padding:10px}
.drawing svg{display:block;width:100%;height:auto}
.hero-copy>*,.drawing{animation:rise .8s both}
.hero-copy>:nth-child(2){animation-delay:.08s}.hero-copy>:nth-child(3){animation-delay:.16s}
.hero-copy>:nth-child(4){animation-delay:.24s}.hero-copy>:nth-child(5){animation-delay:.32s}
.drawing{animation-delay:.2s}
.tank{stroke-dasharray:1400;animation:draw 2.2s .4s ease-out both}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
@keyframes draw{from{stroke-dashoffset:1400}to{stroke-dashoffset:0}}

/* About */
.about{padding:clamp(64px,8vw,120px) 0;background:var(--white)}
.about-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(36px,6vw,96px);align-items:start}
.about-head{position:sticky;top:104px}
.panel{margin-top:36px;background:var(--steel);padding:28px 30px;border-top:4px solid var(--ink)}
.panel h3{margin-bottom:14px}
.panel ul{list-style:none;margin:0;padding:0}
.panel li{padding:10px 0;border-top:1px solid var(--line);font-size:.97rem}
.panel li span{display:block;font-size:.8rem;color:var(--muted)}
.panel a{color:var(--cobalt)}
.big{font-size:1.4rem;line-height:1.45;font-weight:500}
.about-body p{max-width:68ch}
.about-split{display:grid;grid-template-columns:1fr 1fr;gap:32px;margin-top:40px;padding-top:32px;border-top:1px solid var(--line)}
.about-split h3{margin-bottom:8px}

/* Services: ruled specification list */
.services{padding:clamp(64px,8vw,120px) 0;background:var(--paper)}
.section-head{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:end;margin-bottom:48px}
.section-head p{color:var(--muted);margin:0;max-width:56ch}
.svc-list{list-style:none;margin:0;padding:0;border-top:2px solid var(--ink)}
.svc{display:grid;grid-template-columns:.9fr 1.3fr;gap:48px;padding:34px 16px;border-bottom:1px solid var(--line);transition:background .25s,padding-left .25s}
.svc:hover{background:var(--white);padding-left:28px}
.svc-name span{display:inline-block;margin-top:8px;font-size:.85rem;color:var(--cobalt);font-weight:600}
.svc p{margin:0;color:var(--muted);max-width:62ch}

/* Why: dark band */
.why{padding:clamp(64px,8vw,120px) 0;background:var(--ink);color:#e8eef2}
.why-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(36px,6vw,96px)}
.why-intro p{color:#aebcc6;margin-top:20px}
.note{margin-top:32px;padding:20px 22px;border-left:4px solid var(--cobalt);background:#16344b;font-size:.97rem}
.why-items{display:grid;grid-template-columns:1fr 1fr;gap:0 40px}
.why-items article{padding:26px 0;border-top:1px solid #345066}
.why-items article:last-child{grid-column:1/-1}
.why-items h3{color:#fff;margin-bottom:8px}
.why-items p{margin:0;color:#aebcc6;font-size:.98rem}

/* Contact */
.contact{padding:clamp(64px,8vw,120px) 0;background:var(--steel)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,6vw,96px);align-items:start}
.contact-info p{color:var(--muted);margin-top:18px;max-width:50ch}
address{font-style:normal;margin:30px 0;padding:24px 26px;background:var(--white);border-left:4px solid var(--cobalt);line-height:1.8}
address a{color:var(--cobalt);font-weight:600}
.small{font-size:.92rem}
.form{background:var(--white);padding:clamp(24px,3.5vw,44px);border-top:4px solid var(--ink)}
.field{margin-bottom:20px}
label{display:block;font-weight:600;margin-bottom:6px;font-size:.95rem}
input,select,textarea{width:100%;font:inherit;padding:12px 14px;border:1px solid #9aa9b4;background:var(--paper);color:var(--ink);border-radius:2px;transition:border-color .2s,background .2s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--cobalt);background:#fff;box-shadow:0 0 0 3px rgba(36,80,200,.18)}
.field.invalid input,.field.invalid textarea{border-color:#b3261e}
.err{display:block;color:#b3261e;font-size:.85rem;min-height:1.1em;margin-top:4px}
.status{margin:16px 0 0;font-weight:600;color:var(--cobalt-d)}

/* Footer */
.site-footer{background:#091826;color:#aebcc6;padding-top:56px;font-size:.95rem}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.foot strong{color:#fff;font-size:1.05rem}
.foot a{display:block;text-decoration:none;margin-bottom:6px}
.foot a:hover{color:#fff}
.legal{margin-top:40px;padding:20px 0 28px;border-top:1px solid #20384c;font-size:.88rem}

/* Scroll reveal (applied by JS only) */
.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .7s,transform .7s}
.js .reveal.in{opacity:1;transform:none}

@media (max-width:980px){
  .hero{background:var(--paper)}
  .hero-grid,.about-grid,.why-grid,.contact-grid,.section-head,.svc{grid-template-columns:1fr}
  .about-head{position:static}
  .svc{gap:12px}
  .section-head{gap:16px}
  .nav-toggle{display:block}
  .nav{position:absolute;top:76px;left:0;right:0;flex-direction:column;align-items:flex-start;gap:0;background:var(--paper);border-bottom:1px solid var(--line);padding:8px 24px 24px;display:none}
  .nav.open{display:flex}
  .nav a:not(.btn){padding:14px 0;width:100%;border-bottom:1px solid var(--line)}
  .nav .btn{margin-top:16px}
}
@media (max-width:620px){
  body{font-size:16px}
  .wrap{width:calc(100% - 32px)}
  .facts,.about-split,.why-items,.foot{grid-template-columns:1fr}
  .facts div+div{padding-left:0;border-left:0;border-top:1px solid var(--line);margin-top:16px}
  .why-items{gap:0}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
  .js .reveal{opacity:1;transform:none}
}