/* ===========================================================================
   stack.albertdros.com
   Zelfde merkfamilie als gear/deepspace (donker, Jost), maar met het
   kleurenpalet van het DROSSTACKER-logo: diep nachtblauw en een
   cyaan -> blauw -> violet accent.
   =========================================================================== */
:root{
  --bg:#070a16; --bg2:#0b0f22; --panel:#0f1430; --panel2:#0c1026;
  --line:rgba(160,180,255,.14); --line2:rgba(160,180,255,.07);
  --text:#eef0f8; --muted:#a4acc8; --muted2:#737c9c;

  --cyan:#5ad8ff; --blue:#4f6bff; --violet:#8b4dff; --pink:#c468ff;
  --acc-rgb:95,120,255;
  --acc-grad:linear-gradient(100deg,var(--cyan) 0%,var(--blue) 45%,var(--violet) 78%,var(--pink) 100%);
  --steel-grad:linear-gradient(180deg,#ffffff 0%,#eef0f8 40%,#c7cdea 75%,#a5adcf 100%);

  --maxw:1180px; --navh:58px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:'Jost',system-ui,sans-serif;
  text-wrap:pretty;-webkit-font-smoothing:antialiased;line-height:1.6;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input{font:inherit;color:inherit}
button{background:none;border:none;cursor:pointer}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.wrap.narrow{max-width:820px}
section{position:relative}
::selection{background:rgba(var(--acc-rgb),.38)}
strong{font-weight:500;color:#fff}
em{font-style:normal;background:var(--acc-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.path{font-weight:500;color:#d7dcff;white-space:nowrap}
@media(max-width:560px){.path{white-space:normal}}

/* ---------------------------------------------------------------- buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;font-weight:500;font-size:14px;
  letter-spacing:.02em;padding:11px 20px;border-radius:999px;cursor:pointer;border:1px solid transparent;
  transition:transform .15s,filter .15s,border-color .2s,color .2s,background .2s,box-shadow .2s;white-space:nowrap}
.btn .arr{transition:transform .2s}
.btn:hover .arr{transform:translateX(3px)}
.btn-acc{color:#fff;position:relative;
  background:linear-gradient(100deg,#3e6dff 0%,#5a4dff 55%,#7d3fff 100%) padding-box,
             linear-gradient(180deg,rgba(255,255,255,.42) 0%,rgba(255,255,255,.08) 45%,rgba(0,0,0,.3) 100%) border-box;
  box-shadow:0 10px 30px rgba(70,90,255,.32),inset 0 1px 0 rgba(255,255,255,.18)}
.btn-acc:hover{filter:brightness(1.1);transform:translateY(-1px);box-shadow:0 14px 36px rgba(70,90,255,.42),inset 0 1px 0 rgba(255,255,255,.18)}
.btn-acc:disabled{opacity:.55;cursor:default;transform:none;filter:none}
.btn-ghost{border-color:var(--line);color:var(--text);background:rgba(255,255,255,.03)}
.btn-ghost:hover{border-color:rgba(var(--acc-rgb),.7);color:#fff;background:rgba(var(--acc-rgb),.14)}
.btn-lg{font-size:16px;padding:15px 30px}

/* -------------------------------------------------------------------- nav */
.nav{position:fixed;top:0;left:0;right:0;z-index:60;display:grid;grid-template-columns:1fr auto 1fr;
  align-items:center;padding:14px 22px;border-bottom:1px solid transparent;
  transition:background .3s,backdrop-filter .3s,border-color .3s}
.nav.scrolled{background:rgba(7,10,22,.84);backdrop-filter:blur(12px);border-bottom-color:var(--line)}
.nav .brand{display:flex;flex-direction:column;gap:2px;font-weight:300;font-size:12.5px;letter-spacing:.22em;
  text-transform:uppercase;line-height:1.25;justify-self:start}
.nav .brand b{font-weight:600;background:var(--acc-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav .navlogo{justify-self:center}
.nav .navlogo img{height:28px;width:auto;opacity:.95}
.nav .nav-cta{justify-self:end;font-size:13px;padding:10px 18px}
@media(max-width:820px){.nav .navlogo{display:none}.nav{grid-template-columns:1fr auto}}
@media(max-width:520px){.nav .brand{font-size:10.5px;letter-spacing:.16em}:root{--navh:54px}.nav .nav-cta{display:none}}

/* ------------------------------------------------------------------- hero */
.hero{position:relative;overflow:hidden;min-height:100vh;min-height:100svh;display:flex;align-items:center;justify-content:center;
  padding:calc(var(--navh) + 48px) 0 72px;text-align:center;
  background:radial-gradient(120% 90% at 50% -10%,#141b45 0%,#070a16 60%)}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(160,180,255,.28),transparent)}
.hero-glow{position:absolute;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(50% 60% at 50% 36%,rgba(79,107,255,.18) 0%,transparent 70%)}
.hero .wrap{position:relative;z-index:2}
.logo-wrap{position:relative;width:min(60vw,400px);margin:0 auto 30px}
/* Geen schaduw op het icoon: een CSS-filter geeft in Safari soms een rechthoek, een box-shadow
   een lichte rand. De gloed komt alleen van .hero-glow. */
.logo-wrap .halo{display:none}
.hero .logo{position:relative;z-index:1;width:144%;max-width:none;margin:-22% 0 -22% -22%;height:auto}
.hero h1{font-weight:200;font-size:calc(min(60vw,400px) * .1193);line-height:1;letter-spacing:.2em;padding-left:.2em;white-space:nowrap;
  text-transform:uppercase;margin:0 auto 24px;
  background:var(--steel-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.tagline{display:flex;flex-direction:column;align-items:center;gap:14px;margin-bottom:44px}
/* Tagline even breed als de titel (en dus als het icoon): lettergrootte volgt de logobreedte,
   met een ondergrens zodat hij op een telefoon leesbaar blijft. */
.tagline span{display:inline-block;white-space:nowrap;font-size:max(11px,calc(min(60vw,400px) * .0421));letter-spacing:.26em;padding-left:.26em;
  text-transform:uppercase;font-weight:500;line-height:1;
  background:var(--acc-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.tagline em{display:inline-block;white-space:nowrap;font-size:max(10px,calc(min(60vw,400px) * .0350));letter-spacing:.26em;padding-left:.26em;
  text-transform:uppercase;font-weight:300;line-height:1;color:var(--muted2);
  background:none;-webkit-text-fill-color:currentColor}
.lede{font-size:clamp(20px,3vw,30px);font-weight:300;line-height:1.3;color:#d9ddf2;margin:0 auto 40px;max-width:720px}
.lede strong{font-weight:500}
.hero-cta{display:flex;flex-direction:column;align-items:center;gap:14px}


/* --------------------------------------------------------------- sections */
.sec{padding:96px 0}
.sec-head{text-align:center;margin-bottom:48px}
.kicker{font-size:11.5px;letter-spacing:.34em;text-transform:uppercase;font-weight:500;margin-bottom:14px;
  background:var(--acc-grad);-webkit-background-clip:text;background-clip:text;color:transparent;display:inline-block}
h2{font-weight:200;font-size:clamp(30px,4.6vw,52px);line-height:1.1;letter-spacing:.01em;color:#fff}
h4{font-weight:500;font-size:17px;color:#fff;margin-bottom:6px}

/* story */
.story{padding-top:88px}
.story .big{font-size:clamp(20px,2.6vw,27px);font-weight:300;line-height:1.4;color:#e4e7f6;margin-bottom:18px}
.story p{color:var(--muted);font-size:17px}
.feats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:46px 0 36px}
.feat{background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.012));border:1px solid var(--line);
  border-radius:18px;padding:26px 24px 24px;position:relative;overflow:hidden}
.feat::before{content:"";position:absolute;inset:0 0 auto;height:1px;background:linear-gradient(90deg,transparent,rgba(160,180,255,.4),transparent)}
.feat .ico{display:inline-flex;width:42px;height:42px;border-radius:12px;align-items:center;justify-content:center;margin-bottom:16px;
  background:linear-gradient(135deg,rgba(90,216,255,.16),rgba(139,77,255,.22));border:1px solid rgba(160,180,255,.22)}
.feat .ico svg{width:22px;height:22px;fill:none;stroke:url(#g) var(--cyan);stroke:#8fb4ff;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.feat p{font-size:15px;color:var(--muted);line-height:1.5}
.note{display:flex;gap:14px;align-items:flex-start;border-radius:16px;padding:20px 24px;font-size:15.5px;line-height:1.55;color:#d6d9ec;
  background:linear-gradient(90deg,rgba(196,104,255,.10),rgba(79,107,255,.06));border:1px solid rgba(196,104,255,.26);
  border-left:3px solid var(--pink)}
.note strong{color:#fff}
@media(max-width:820px){.feats{grid-template-columns:1fr}}

/* how */
.how{background:linear-gradient(180deg,var(--bg) 0%,var(--bg2) 50%,var(--bg) 100%)}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.step{position:relative;padding:22px 26px 26px;border-radius:18px;background:var(--panel2);border:1px solid var(--line2);display:flex;flex-direction:column}
.shot{height:150px;margin:0 0 22px;border-radius:12px;display:flex;align-items:center;justify-content:center;padding:14px;
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.02));border:1px solid var(--line2);overflow:hidden}
.shot img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;border-radius:6px;
  box-shadow:0 10px 30px rgba(0,0,0,.45)}
.shot.wide img{width:100%}
.step-n{display:inline-flex;width:34px;height:34px;border-radius:50%;align-items:center;justify-content:center;
  font-size:14px;font-weight:600;color:#fff;margin-bottom:18px;background:var(--acc-grad);box-shadow:0 8px 22px rgba(70,90,255,.35)}
.step p{color:var(--muted);font-size:15.5px;line-height:1.55}
@media(max-width:820px){.steps{grid-template-columns:1fr}}

/* install */
.install-steps{list-style:none;counter-reset:s;display:grid;gap:14px;margin-bottom:34px}
.install-steps li{counter-increment:s;position:relative;padding:18px 22px 18px 66px;border-radius:14px;
  background:linear-gradient(180deg,rgba(255,255,255,.03),rgba(255,255,255,.01));border:1px solid var(--line2);color:#d4d8ec;font-size:16px;line-height:1.55}
.install-steps li::before{content:counter(s);position:absolute;left:20px;top:18px;width:30px;height:30px;border-radius:9px;
  display:flex;align-items:center;justify-content:center;font-size:13.5px;font-weight:600;color:#fff;
  background:linear-gradient(135deg,#3e6dff,#7d3fff)}
.pdf-link{margin:-14px 0 30px;font-size:14.5px}
.pdf-link a{color:#b9c4ff;border-bottom:1px dotted rgba(185,196,255,.5)}
.pdf-link .arr{display:inline-block;margin-left:2px}
.reqs{display:grid;gap:12px;font-size:14.5px;color:var(--muted);line-height:1.55}
.reqs>div{display:grid;grid-template-columns:150px 1fr;gap:16px;padding:12px 0;border-top:1px solid var(--line2)}
.reqs>div:last-child{border-bottom:1px solid var(--line2)}
.reqs .k{font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted2);font-weight:500;padding-top:3px}
@media(max-width:560px){.reqs>div{grid-template-columns:1fr;gap:4px}}

/* download */
.download{padding:40px 0 110px;overflow:hidden}
.dl-glow{position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(50% 60% at 50% 60%,rgba(79,107,255,.18) 0%,transparent 70%)}
.dl-card{position:relative;display:grid;grid-template-columns:220px 1fr;gap:40px;align-items:center;
  padding:46px 48px;border-radius:26px;
  background:linear-gradient(135deg,rgba(20,27,69,.9),rgba(10,14,34,.95)) padding-box,
             linear-gradient(135deg,rgba(90,216,255,.5),rgba(139,77,255,.45),rgba(196,104,255,.3)) border-box;
  border:1px solid transparent;box-shadow:0 30px 80px rgba(0,0,0,.5)}
.dl-logo{width:200px;height:auto;filter:drop-shadow(0 20px 40px rgba(60,80,255,.4))}
.dl-body h2{margin-bottom:12px}
.dl-sub{color:var(--muted);font-size:16px;margin-bottom:24px;max-width:600px}
.dl-form .row{display:flex;gap:10px;margin-bottom:14px}
.dl-form input[type=email]{flex:1;min-width:0;height:48px;padding:0 18px;border-radius:999px;
  background:rgba(255,255,255,.05);border:1px solid var(--line);color:#fff;outline:none;transition:border-color .2s,box-shadow .2s}
.dl-form input[type=email]::placeholder{color:var(--muted2)}
.dl-form input[type=email]:focus{border-color:rgba(var(--acc-rgb),.7);box-shadow:0 0 0 4px rgba(var(--acc-rgb),.18)}
.dl-form .row .btn{height:48px}
.consent{font-size:14px;color:#b4bad4;line-height:1.5;max-width:600px}
.check{display:flex;align-items:flex-start;gap:12px;font-size:14.5px;color:#cfd4ea;cursor:pointer;line-height:1.45;max-width:600px}
.check input{position:absolute;opacity:0;width:0;height:0}
.check .box{flex:none;width:20px;height:20px;margin-top:2px;border-radius:6px;border:1px solid rgba(160,180,255,.4);
  background:rgba(255,255,255,.04);position:relative;transition:background .15s,border-color .15s}
.check input:checked+.box{background:var(--acc-grad);border-color:transparent}
.check input:checked+.box::after{content:"";position:absolute;left:6px;top:2px;width:5px;height:10px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg)}
.check input:focus-visible+.box{box-shadow:0 0 0 4px rgba(var(--acc-rgb),.25)}
.hp{position:absolute;left:-9999px;opacity:0;height:0;width:0}
.err{min-height:20px;margin-top:10px;font-size:13.5px;color:#ff8aa6}
.dl-done{display:none}
.dl-card.done .dl-form{display:none}
.dl-card.done .dl-done{display:block}
.dl-done h3{font-weight:300;font-size:24px;color:#fff;margin-bottom:10px}
.dl-done .mail-ico{display:inline-flex;width:46px;height:46px;border-radius:14px;align-items:center;justify-content:center;margin-bottom:16px;
  background:linear-gradient(135deg,rgba(90,216,255,.16),rgba(139,77,255,.22));border:1px solid rgba(160,180,255,.22)}
.dl-done .mail-ico svg{width:24px;height:24px;fill:none;stroke:#8fb4ff;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.dl-inbox{color:#d4d8ec;font-size:16px;max-width:560px}
@media(max-width:820px){.dl-inbox{margin:0 auto}}
.dl-btns{display:flex;flex-wrap:wrap;gap:12px}
@media(max-width:820px){.dl-btns{justify-content:center}}
.dl-done .small{font-size:13.5px;color:var(--muted);margin-top:14px}
.dl-done .small a{color:#b9c4ff;border-bottom:1px dotted rgba(185,196,255,.5)}
.fine{margin-top:20px;font-size:12.5px;color:var(--muted2)}
@media(max-width:820px){.dl-card{grid-template-columns:1fr;gap:22px;padding:34px 26px;text-align:center}
  .dl-logo{margin:0 auto;width:150px;height:150px}.dl-sub,.check{margin-left:auto;margin-right:auto}
  .dl-form .row{flex-direction:column}.dl-form .row .btn{width:100%}.check{text-align:left}}

/* footer */
.foot{padding:44px 0 56px;border-top:1px solid var(--line2);text-align:center;color:var(--muted2);font-size:14px}
.footlogo img{height:30px;width:auto;margin:0 auto 18px;opacity:.9}
.foot p a{color:var(--muted);border-bottom:1px dotted rgba(164,172,200,.4)}
.foot .socials{margin-top:22px;display:flex;justify-content:center;gap:12px}
.foot .socials a{display:inline-flex;width:42px;height:42px;border-radius:50%;align-items:center;justify-content:center;border:1px solid var(--line);
  color:var(--muted);background:rgba(255,255,255,.03);transition:color .2s,border-color .2s,background .2s,transform .15s}
.foot .socials a:hover{color:#fff;border-color:rgba(var(--acc-rgb),.7);background:rgba(var(--acc-rgb),.16);transform:translateY(-2px)}
.foot .socials svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}

/* reveal */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}
.hero h1 b{font-weight:600}
.note .ex{flex:none;width:26px;height:26px;border-radius:50%;margin-top:1px;display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--violet),var(--pink));color:#fff;font-weight:700;font-size:16px;line-height:1;box-shadow:0 6px 16px rgba(196,104,255,.35)}