/* Epsilon Unmanned Systems Limited — site styles */
:root{
  --ink:#0d1b33;
  --navy:#16294a;
  --blue:#243f6b;
  --blue-2:#2f5190;
  --sky:#6cc4ff;
  --mist:#f3f5f9;
  --line:#d9dfea;
  --text:#27344d;
  --muted:#5d6a82;
  --white:#fff;
  --radius:14px;
  --maxw:1240px;
  --gutter:clamp(20px,4vw,56px);
  --ease:cubic-bezier(.2,.7,.2,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Montserrat',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;color:var(--text);background:#fff;line-height:1.65;font-size:17px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
:focus-visible{outline:3px solid var(--sky);outline-offset:3px;border-radius:4px}
.skip{position:absolute;left:-999px;top:8px;background:#fff;color:var(--ink);padding:10px 16px;z-index:200;border-radius:8px}
.skip:focus{left:8px}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
.kicker{font-size:.76rem;letter-spacing:.2em;text-transform:uppercase;font-weight:600;color:var(--blue-2);margin-bottom:18px;display:block}
.on-dark .kicker,.hero .kicker,.page-hero .kicker{color:var(--sky)}
h1,h2,h3,h4{font-weight:600;color:var(--ink);line-height:1.15;letter-spacing:-.01em}
.on-dark h1,.on-dark h2,.on-dark h3,.on-dark h4{color:#fff}
h2.title{font-size:clamp(1.9rem,3.6vw,3rem);font-weight:300;letter-spacing:-.02em}
h2.title strong{font-weight:600}
.lead{font-size:clamp(1.05rem,1.5vw,1.25rem);line-height:1.7;color:var(--text);max-width:62ch}
.on-dark .lead,.on-dark p{color:rgba(255,255,255,.82)}
section{padding:clamp(64px,9vw,128px) 0}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:32px;margin-bottom:clamp(32px,5vw,64px);flex-wrap:wrap}
.on-dark{background:var(--navy);color:#fff}
.on-ink{background:var(--ink)}
.bg-mist{background:var(--mist)}

/* ---------- Buttons / links ---------- */
.btn{display:inline-flex;align-items:center;gap:12px;padding:15px 28px;border-radius:999px;font-weight:600;font-size:.92rem;letter-spacing:.02em;transition:transform .3s var(--ease),background .3s,color .3s,box-shadow .3s;border:1.5px solid transparent}
.btn svg{width:18px;height:18px;transition:transform .3s var(--ease)}
.btn:hover svg{transform:translateX(4px)}
.btn-primary{background:#fff;color:var(--ink)}
.btn-primary:hover{background:var(--sky)}
.btn-dark{background:var(--blue);color:#fff}
.btn-dark:hover{background:var(--ink)}
.btn-ghost{border-color:rgba(255,255,255,.55);color:#fff}
.btn-ghost:hover{background:#fff;color:var(--ink)}
.more{display:inline-flex;align-items:center;gap:10px;font-weight:600;font-size:.9rem;color:var(--blue);border-bottom:1.5px solid currentColor;padding-bottom:3px}
.more svg{width:16px;height:16px;transition:transform .3s var(--ease)}
.more:hover svg{transform:translateX(5px)}
.on-dark .more{color:#fff}

/* ---------- Header ---------- */
.site-header{position:fixed;inset:0 0 auto 0;z-index:100;transition:background .35s,box-shadow .35s,transform .35s var(--ease)}
.bar{display:flex;align-items:center;justify-content:space-between;height:84px;gap:24px}
.brand img{height:46px;width:auto;transition:opacity .3s}
.brand .l-dark{display:none}
.nav{display:flex;align-items:center;gap:6px}
.nav > li{position:relative}
.nav a.top,.nav button.top{display:flex;align-items:center;gap:6px;padding:12px 14px;font-weight:600;font-size:.88rem;letter-spacing:.02em;color:#fff;border-radius:999px;transition:background .25s,color .25s}
.nav button.top svg{width:12px;height:12px;transition:transform .3s var(--ease)}
.nav .top:hover,.nav .top[aria-expanded="true"]{background:rgba(255,255,255,.14)}
.nav button.top[aria-expanded="true"] svg{transform:rotate(180deg)}
.nav .top.active{box-shadow:inset 0 -2px 0 var(--sky);border-radius:0}
.nav .cta{background:#fff;color:var(--ink)!important;margin-left:8px}
.nav .cta:hover{background:var(--sky)!important}
.menu-btn{display:none;width:46px;height:46px;border-radius:50%;align-items:center;justify-content:center;color:#fff;background:rgba(255,255,255,.14)}
.menu-btn span{display:block;width:20px;height:2px;background:currentColor;position:relative;transition:.3s}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0;width:20px;height:2px;background:currentColor;transition:.3s}
.menu-btn span::before{top:-6px}.menu-btn span::after{top:6px}
.menu-open .menu-btn span{background:transparent}
.menu-open .menu-btn span::before{top:0;transform:rotate(45deg)}
.menu-open .menu-btn span::after{top:0;transform:rotate(-45deg)}
/* header solid state */
.site-header.solid,.menu-open .site-header{background:rgba(255,255,255,.97);backdrop-filter:blur(10px);box-shadow:0 1px 0 var(--line)}
.site-header.solid .nav .top,.menu-open .menu-btn{color:var(--ink)}
.site-header.solid .nav .top:hover,.site-header.solid .nav .top[aria-expanded="true"]{background:var(--mist)}
.site-header.solid .nav .cta{background:var(--blue);color:#fff!important}
.site-header.solid .nav .cta:hover{background:var(--ink)!important}
.site-header.solid .menu-btn,.menu-open .menu-btn{background:var(--mist);color:var(--ink)}
.site-header.solid .brand .l-light,.menu-open .brand .l-light{display:none}
.site-header.solid .brand .l-dark,.menu-open .brand .l-dark{display:block}
/* mega drawer */
.mega{position:absolute;top:100%;left:50%;transform:translate(-50%,12px);width:min(760px,92vw);background:#fff;color:var(--text);border-radius:var(--radius);box-shadow:0 30px 80px -20px rgba(13,27,51,.45);padding:28px;display:grid;grid-template-columns:1fr 1.4fr;gap:28px;opacity:0;visibility:hidden;transition:opacity .25s,transform .3s var(--ease),visibility .25s}
.nav > li.open .mega{opacity:1;visibility:visible;transform:translate(-50%,6px)}
.mega h4{font-size:1.15rem;margin-bottom:8px;color:var(--ink)}
.mega p{font-size:.88rem;color:var(--muted);line-height:1.55}
.mega ul{display:grid;gap:2px}
.mega li a{display:block;padding:11px 14px;border-radius:10px;font-weight:600;font-size:.9rem;color:var(--ink);transition:background .2s,padding .25s var(--ease)}
.mega li a small{display:block;font-weight:400;color:var(--muted);font-size:.78rem}
.mega li a:hover{background:var(--mist);padding-left:20px}

/* ---------- Hero (video) ---------- */
.hero{position:relative;height:100svh;min-height:620px;background:var(--ink);color:#fff;overflow:hidden;isolation:isolate}
.hero video,.hero .poster{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(7,15,30,.55) 0%,rgba(7,15,30,.12) 28%,rgba(7,15,30,.2) 55%,rgba(7,15,30,.78) 100%),linear-gradient(90deg,rgba(7,15,30,.6) 0%,rgba(7,15,30,0) 62%);transition:opacity .9s}
.hero.logo-phase::before{opacity:0}
.hero-copy{position:absolute;left:0;right:0;bottom:clamp(96px,16vh,170px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.hero.logo-phase .hero-copy{opacity:0;transform:translateY(18px);pointer-events:none}
.hero h1{color:#fff;font-weight:300;font-size:clamp(2.3rem,6vw,5.2rem);letter-spacing:-.03em;max-width:15ch;line-height:1.04}
.hero h1 strong{font-weight:600}
.hero p.sub{font-size:clamp(1rem,1.6vw,1.3rem);max-width:54ch;margin-top:26px;color:rgba(255,255,255,.88)}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:36px}
.hero-ui{position:absolute;left:0;right:0;bottom:30px;display:flex;justify-content:space-between;align-items:center}
.scroll-cue{display:flex;align-items:center;gap:12px;font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;font-weight:600;color:#fff;opacity:.9}
.scroll-cue i{display:block;width:1px;height:42px;background:rgba(255,255,255,.35);position:relative;overflow:hidden}
.scroll-cue i::after{content:"";position:absolute;left:0;top:-40%;width:1px;height:40%;background:#fff;animation:drip 2.2s infinite var(--ease)}
@keyframes drip{to{top:100%}}
.pp{width:46px;height:46px;border-radius:50%;border:1.5px solid rgba(255,255,255,.6);display:grid;place-items:center;transition:background .25s,color .25s}
.pp:hover{background:#fff;color:var(--ink)}
.pp svg{width:16px;height:16px}
.pp .i-play{display:none}.pp.paused .i-play{display:block}.pp.paused .i-pause{display:none}

/* ---------- Page hero (sub pages) ---------- */
.page-hero{position:relative;padding:190px 0 clamp(70px,9vw,120px);background:var(--ink);color:#fff;overflow:hidden;isolation:isolate}
.page-hero .bg{position:absolute;inset:0;z-index:-2;background-size:cover;background-position:center;opacity:.55}
.page-hero::after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,rgba(13,27,51,.95) 0%,rgba(13,27,51,.7) 55%,rgba(13,27,51,.35) 100%)}
.crumbs{font-size:.78rem;letter-spacing:.08em;margin-bottom:28px;color:rgba(255,255,255,.7)}
.crumbs a:hover{color:#fff}
.crumbs span{margin:0 8px;opacity:.5}
.page-hero h1{color:#fff;font-weight:300;font-size:clamp(2.2rem,5vw,4.2rem);letter-spacing:-.025em;max-width:18ch}
.page-hero h1 strong{font-weight:600}
.page-hero p{max-width:58ch;margin-top:22px;font-size:1.1rem;color:rgba(255,255,255,.85)}
.page-nav{position:sticky;top:84px;z-index:50;background:#fff;border-bottom:1px solid var(--line)}
.page-nav ul{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none}
.page-nav a{display:block;padding:18px 16px;font-size:.84rem;font-weight:600;white-space:nowrap;color:var(--muted);border-bottom:2px solid transparent;transition:color .2s,border-color .2s}
.page-nav a:hover,.page-nav a.on{color:var(--ink);border-color:var(--blue)}

/* ---------- Layout helpers ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,6vw,96px);align-items:center}
.split.top{align-items:start}
.split.rev .media{order:-1}
.media img{width:100%;border-radius:var(--radius);object-fit:cover}
.media.tall img{aspect-ratio:4/5}
.media.wide img{aspect-ratio:16/10}
.media.round img{border-radius:var(--radius)}
.prose p+p{margin-top:1.1em}
.prose h3{font-size:1.4rem;margin:1.6em 0 .5em}
.checks li{position:relative;padding:11px 0 11px 34px;border-bottom:1px solid var(--line)}
.checks li::before{content:"";position:absolute;left:2px;top:19px;width:14px;height:8px;border-left:2px solid var(--blue-2);border-bottom:2px solid var(--blue-2);transform:rotate(-45deg)}
.on-dark .checks li{border-color:rgba(255,255,255,.14)}
.on-dark .checks li::before{border-color:var(--sky)}
.checks li b{color:var(--ink)}.on-dark .checks li b{color:#fff}

/* ---------- Cards ---------- */
.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{position:relative;display:flex;flex-direction:column;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:0 1px 0 var(--line),0 0 0 1px var(--line) inset;transition:transform .45s var(--ease),box-shadow .45s}
.card:hover{transform:translateY(-6px);box-shadow:0 30px 60px -28px rgba(13,27,51,.4)}
.card .ph{aspect-ratio:4/3;overflow:hidden;background:var(--mist)}
.card .ph img{width:100%;height:100%;object-fit:cover;transition:transform .8s var(--ease)}
.card:hover .ph img{transform:scale(1.06)}
.card .body{padding:26px 26px 30px;display:flex;flex-direction:column;gap:12px;flex:1}
.card .tag{font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;font-weight:600;color:var(--blue-2)}
.card h3{font-size:1.28rem}
.card p{font-size:.95rem;color:var(--muted)}
.card .more{margin-top:auto;align-self:flex-start}
.card.contain .ph{background:linear-gradient(160deg,#fff,var(--mist))}
.card.contain .ph img{object-fit:contain;padding:18px}
.icon{width:54px;height:54px;border-radius:14px;display:grid;place-items:center;background:var(--mist);color:var(--blue);margin-bottom:6px}
.icon svg{width:26px;height:26px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.on-dark .icon{background:rgba(255,255,255,.1);color:var(--sky)}

/* industry tiles */
.tile{display:flex;flex-direction:column;gap:14px;padding:34px 28px 30px;border-radius:var(--radius);background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);transition:background .35s,transform .45s var(--ease),border-color .35s}
.tile:hover{background:rgba(255,255,255,.12);transform:translateY(-6px);border-color:rgba(108,196,255,.6)}
.tile h3{font-size:1.2rem}.tile p{font-size:.93rem}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;text-align:left}
.stat{border-top:1px solid rgba(255,255,255,.25);padding-top:22px}
.stat b{display:block;font-size:clamp(2.6rem,5vw,4.4rem);font-weight:300;letter-spacing:-.03em;color:#fff;line-height:1}
.stat span{display:block;margin-top:14px;font-size:.85rem;letter-spacing:.08em;color:rgba(255,255,255,.75);max-width:22ch}

/* numbered list */
.num-list{counter-reset:n;display:grid;grid-template-columns:repeat(2,1fr);gap:0 clamp(32px,6vw,90px)}
.num-list li{counter-increment:n;padding:30px 0 30px 70px;position:relative;border-top:1px solid var(--line)}
.num-list li::before{content:counter(n,decimal-leading-zero);position:absolute;left:0;top:30px;font-size:1.5rem;font-weight:300;color:var(--blue-2)}
.num-list h3{font-size:1.2rem;margin-bottom:8px}
.num-list p{font-size:.95rem;color:var(--muted)}

/* people */
.person{display:flex;gap:26px;align-items:center}
.person img{width:150px;height:150px;border-radius:50%;object-fit:cover;object-position:center 20%;flex:none;box-shadow:0 0 0 6px var(--mist)}
.person h3{font-size:1.2rem}.person span{color:var(--blue-2);font-weight:600;font-size:.85rem;letter-spacing:.06em;text-transform:uppercase}
.leaders .person{flex-direction:column;text-align:center;gap:18px}
.on-dark .person img{box-shadow:0 0 0 6px rgba(255,255,255,.12)}
.on-dark .person span{color:var(--sky)}

/* tags / chips */
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{padding:10px 18px;border:1px solid var(--line);border-radius:999px;font-size:.88rem;font-weight:600;color:var(--ink);background:#fff}
.partner{padding:34px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;display:flex;flex-direction:column;gap:10px;transition:transform .4s var(--ease),box-shadow .4s}
.partner:hover{transform:translateY(-5px);box-shadow:0 26px 50px -28px rgba(13,27,51,.4)}
.partner .mono{font-weight:600;font-size:1.5rem;color:var(--blue);letter-spacing:-.01em}
.plogo{height:92px;display:flex;align-items:center;margin-bottom:6px}.plogo img{max-height:84px;max-width:100%;width:auto;object-fit:contain}
.partner small{color:var(--muted);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;font-weight:600}
.note{border-left:3px solid var(--sky);padding:16px 20px;background:var(--mist);border-radius:0 10px 10px 0;font-size:.92rem;color:var(--text)}

/* timeline strip */
.strip{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;overflow:hidden}
.strip img{width:100%;height:auto}

/* CTA band */
.cta-band{background:linear-gradient(120deg,var(--blue) 0%,var(--ink) 100%);color:#fff;padding:clamp(64px,8vw,110px) 0;position:relative;overflow:hidden}
.cta-band h2{color:#fff;font-weight:300;font-size:clamp(2rem,4.2vw,3.4rem);max-width:20ch}
.cta-band h2 strong{font-weight:600}
.cta-band .wrap{display:flex;justify-content:space-between;align-items:center;gap:40px;flex-wrap:wrap}
.cta-band::after{content:"";position:absolute;right:-6%;top:50%;width:520px;height:520px;transform:translateY(-50%);background:url(img/mark-white.png) center/contain no-repeat;opacity:.06;pointer-events:none}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:clamp(32px,6vw,90px)}
.info-item{display:flex;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}
.info-item .icon{flex:none;margin:0}
.info-item h4{font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;color:var(--blue-2);margin-bottom:6px}
.info-item p,.info-item a{font-size:1rem;color:var(--ink)}
.info-item a:hover{color:var(--blue-2);text-decoration:underline}
form{display:grid;gap:18px;background:var(--mist);padding:clamp(26px,4vw,48px);border-radius:var(--radius)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
label{display:grid;gap:8px;font-size:.8rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--blue)}
input,select,textarea{font:inherit;font-size:1rem;padding:15px 16px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);width:100%;letter-spacing:0;text-transform:none;font-weight:400}
textarea{min-height:150px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:2px solid var(--blue-2);border-color:transparent}
.form-note{font-size:.82rem;color:var(--muted)}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.75);padding:clamp(56px,7vw,96px) 0 28px;font-size:.92rem}
.foot{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:40px}
.foot img.f-logo{height:54px;width:auto;margin-bottom:22px}
.foot h4{color:#fff;font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;margin-bottom:18px}
.foot li{margin-bottom:10px}
.foot a:hover{color:#fff;text-decoration:underline}
.foot p{max-width:34ch}
.legal{margin-top:56px;padding-top:24px;border-top:1px solid rgba(255,255,255,.14);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:.8rem;color:rgba(255,255,255,.55)}

/* ---------- Reveal ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .9s var(--ease),transform .9s var(--ease);transition-delay:var(--d,0s)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .scroll-cue i::after{animation:none}
}

/* ---------- Responsive ---------- */
@media (max-width:1100px){
  .g4{grid-template-columns:repeat(2,1fr)}
  .foot{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:980px){
  .menu-btn{display:flex}
  .nav{position:fixed;inset:84px 0 0 0;background:#fff;flex-direction:column;align-items:stretch;gap:0;padding:12px var(--gutter) 40px;overflow-y:auto;transform:translateX(100%);transition:transform .45s var(--ease);visibility:hidden}
  .menu-open .nav{transform:none;visibility:visible}
  .nav > li{border-bottom:1px solid var(--line)}
  .nav a.top,.nav button.top{color:var(--ink)!important;width:100%;justify-content:space-between;padding:20px 4px;font-size:1.05rem;border-radius:0}
  .nav .top:hover,.nav .top[aria-expanded="true"]{background:none!important}
  .nav .top.active{box-shadow:none;color:var(--blue-2)!important}
  .nav .cta{margin:22px 0 0;justify-content:center;background:var(--blue);color:#fff!important;border-radius:999px;padding:18px}
  .mega{position:static;transform:none!important;width:100%;box-shadow:none;padding:0;display:none;opacity:1;visibility:visible;grid-template-columns:1fr;border-radius:0;background:none}
  .mega > div:first-child{display:none}
  .nav > li.open .mega{display:grid;padding-bottom:14px}
  .page-nav{top:84px}
  .split,.contact-grid{grid-template-columns:1fr}
  .split.rev .media{order:0}
  .g3{grid-template-columns:1fr 1fr}
  .num-list{grid-template-columns:1fr}
}
@media (max-width:680px){
  body{font-size:16px}
  .bar{height:72px}.nav{inset:72px 0 0 0}.page-nav{top:72px}
  .brand img{height:38px}
  .g2,.g3,.g4,.stats,.row2,.foot{grid-template-columns:1fr}
  .person{flex-direction:column;text-align:center}
  .hero-copy{bottom:120px}
  .hero{min-height:560px}
  .sec-head{align-items:flex-start}
  .page-hero{padding-top:140px}
}
.hero-ui .wrap{width:100%}
.card.contain .ph{background:#fff}
@media (max-width:980px){
  .site-header.solid,.menu-open .site-header{backdrop-filter:none;-webkit-backdrop-filter:none;background:#fff}
}
@media (max-width:980px){.nav a.top.cta{color:#fff!important}}
/* hero text rebalance */
.hero h1{font-size:clamp(2.4rem,5.2vw,4.8rem);max-width:19ch;line-height:1.06}
.hero p.sub{max-width:50ch;margin-top:24px}
.hero .actions{margin-top:34px}
@media (max-width:680px){.hero h1{font-size:2.5rem;max-width:12ch}}

.logos{display:grid;grid-template-columns:repeat(auto-fill,minmax(176px,1fr));gap:16px}
.lcard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 14px 16px;display:flex;flex-direction:column;align-items:center;justify-content:space-between;gap:14px;text-align:center;transition:transform .4s var(--ease),box-shadow .4s}
.lcard:hover{transform:translateY(-4px);box-shadow:0 22px 44px -26px rgba(13,27,51,.4)}
.lcard .lim{height:84px;width:100%;display:flex;align-items:center;justify-content:center}
.lcard img{max-height:84px;max-width:100%;width:auto;object-fit:contain}
.lcard span{font-size:.78rem;color:var(--muted);font-weight:600;line-height:1.35}