/* Turn It Up, Son! Volume Booster & Mixer - (c) 2026 romanzbudowy.
   All rights reserved / Wszelkie prawa zastrzezone. Copying and publication prohibited / Kopiowanie i publikacja zabronione (LICENSE.txt). */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --paper:#f7fbff;
  --paper2:#e7f0fd;
  --paper3:#cfe0f7;
  --ink:#0a1730;
  --ink2:#16305e;
  --ink3:#2c4270;
  --soft:#64749c;
  --blue:#1d4ed8;
  --hl:#ffd21e;
  --red:#e02b12;
  --green:#0f7a53;
  --disp:"Hanken Grotesk",system-ui,sans-serif;
  --body:"Inter",system-ui,sans-serif;
  --hand:"Caveat",cursive;
}
html{scroll-behavior:smooth}
body{
  background:var(--paper);
  font-size:var(--text-m);
  color:var(--ink);
  font-family:var(--body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  position:relative;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:var(--hl);color:var(--ink)}

.paper{
  position:fixed;inset:0;z-index:-3;
  background:
    radial-gradient(1100px 800px at 78% 8%,rgba(29,78,216,.10) 0%,rgba(29,78,216,0) 62%),
    radial-gradient(900px 700px at 12% 78%,rgba(29,78,216,.08) 0%,rgba(29,78,216,0) 60%),
    linear-gradient(160deg,var(--paper) 0%,var(--paper2) 48%,var(--paper3) 100%);
}
.grid-lines{
  position:fixed;inset:0;z-index:-2;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(20,60,130,.055) 0 1px,transparent 1px 58px);
}
.defs{position:absolute;width:0;height:0;overflow:hidden}
.boil{animation:boil 1.35s steps(1,end) infinite}
@keyframes boil{
  0%{filter:url(#b0)}
  34%{filter:url(#b1)}
  67%{filter:url(#b2)}
}

.wrap{max-width:1120px;margin:0 auto;padding:0 28px;position:relative}

nav{position:fixed;inset:0 0 auto 0;z-index:60;backdrop-filter:blur(14px);background:rgba(247,251,255,.72)}
nav::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:linear-gradient(90deg,transparent,rgba(22,48,94,.25) 12%,rgba(22,48,94,.25) 88%,transparent);
}
.nav-in{max-width:1120px;margin:0 auto;padding:0 28px;height:66px;display:flex;align-items:center;gap:20px}
.brand{flex:1;display:flex;align-items:center;gap:11px;white-space:nowrap;font-family:var(--disp);font-weight:800;font-size:var(--text-m);letter-spacing:-.02em;color:var(--ink)}
.brand img{width:30px;height:30px;border-radius:8px}
.nav-links{flex:0 0 auto;display:flex;align-items:center;gap:24px;font-size:var(--text-s);font-weight:500;color:var(--ink3)}
.nav-links a{position:relative;padding:4px 0}
.nav-links a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:.42em;z-index:-1;
  background:var(--hl);border-radius:3px;transform:scaleX(0);transform-origin:left;
  transition:transform .18s ease;
}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after{transform:scaleX(1)}
.nav-right{flex:1;display:flex;align-items:center;justify-content:flex-end;gap:18px}
.nav-rate{display:flex;align-items:center;gap:8px;font-size:var(--text-s);color:var(--soft);white-space:nowrap}
.nav-rate .stars{color:#f0a500;letter-spacing:1.5px;font-size:var(--text-s)}
.nav-rate b{color:var(--ink);font-weight:700;font-family:var(--disp)}
.nav-tag{font-family:var(--hand);font-size:var(--hand-s);color:var(--red);transform:rotate(-5deg);margin-left:10px;line-height:1}
.nav-rate-btn{font-size:var(--text-s);padding:9px 16px;border-radius:12px;gap:7px}
.nav-rate-btn .stars{color:#f0a500;letter-spacing:1px;font-size:var(--text-s)}
@media (max-width:1080px){.nav-rate,.nav-rate-btn{display:none}}
@media (max-width:900px){.nav-tag{display:none}}

.btn{
  position:relative;display:inline-flex;align-items:center;gap:10px;
  font-family:var(--disp);font-weight:800;font-size:var(--text-s);letter-spacing:-.01em;
  color:#fff;background:var(--ink);border-radius:14px;padding:12px 22px;
  border:2px solid var(--ink);
  box-shadow:5px 5px 0 rgba(10,23,48,.22);
  transition:transform .14s ease,box-shadow .14s ease;
  white-space:nowrap;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:8px 8px 0 rgba(10,23,48,.26)}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 rgba(10,23,48,.22)}
.btn.big{font-size:var(--text-l);padding:17px 34px;border-radius:17px}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:4px 4px 0 rgba(10,23,48,.14)}
.btn.ghost:hover{background:rgba(255,255,255,.6)}

.mark{position:relative;display:inline-block;padding:0 6px;z-index:1}
.mark::before{
  content:"";position:absolute;left:0;right:0;bottom:.06em;height:.52em;z-index:-1;
  background:var(--hl);border-radius:4px;transform:rotate(-.6deg);
}

.page-head{padding:126px 0 34px;position:relative}
.eyebrow{
  font-family:var(--hand);font-size:var(--hand-m);color:var(--blue);
  transform:rotate(-2deg);display:inline-block;margin-bottom:4px;
}
h1{font-family:var(--disp);font-weight:800;font-size:var(--head-l);line-height:1;letter-spacing:-.04em;color:var(--ink)}
.page-sub{margin-top:18px;font-size:var(--text-l);color:var(--ink3);max-width:640px}
.page-sub b{color:var(--ink);font-weight:600}

.head-art{position:absolute;right:22px;top:104px;width:190px;pointer-events:none}
.head-art svg{width:100%;height:auto;display:block}
.head-art .ln{fill:none;stroke:rgba(29,78,216,.42);stroke-width:3.4;stroke-linecap:round;stroke-linejoin:round}
.head-art .fill-p{fill:var(--paper);stroke:rgba(29,78,216,.42);stroke-width:3.4;stroke-linejoin:round}
@media (max-width:900px){.head-art{display:none}}

.langs{display:flex;gap:10px;margin-top:26px}
.lang{
  font-family:var(--disp);font-weight:700;font-size:var(--text-s);color:var(--ink2);
  background:transparent;border:2px solid rgba(22,48,94,.32);border-radius:11px;
  padding:8px 16px;cursor:pointer;transition:all .14s ease;
}
.lang:hover{border-color:var(--ink);transform:translateY(-2px)}
.lang.on{background:var(--ink);border-color:var(--ink);color:#fff;box-shadow:4px 4px 0 rgba(10,23,48,.2)}

main{padding-bottom:40px}
.block{padding:34px 0 6px;position:relative}
.block h2{
  font-family:var(--disp);font-weight:800;font-size:var(--head-s);
  letter-spacing:-.03em;color:var(--ink);margin-bottom:12px;
  padding-left:22px;position:relative;
}
.block h2::before{
  content:"";position:absolute;left:0;top:.24em;bottom:.24em;width:5px;
  background:var(--blue);border-radius:3px;
}
.block p{max-width:780px;margin-bottom:12px;font-size:var(--text-m);color:var(--ink3)}
.block p strong{color:var(--ink);font-weight:600}
.block ul{max-width:780px;margin:0 0 12px 0;list-style:none}
.block li{position:relative;padding-left:26px;margin-bottom:9px;font-size:var(--text-m);color:var(--ink3)}
.block li::before{
  content:"";position:absolute;left:2px;top:.62em;width:9px;height:9px;
  border:2.6px solid var(--blue);border-radius:50%;
}
.block li strong{color:var(--ink);font-weight:700;font-family:var(--disp)}
.ok{background:var(--hl);color:var(--ink);font-weight:600;padding:1px 5px;border-radius:3px}
.block a{border-bottom:2px solid rgba(29,78,216,.32)}
.block a:hover{color:var(--blue)}

.rule{display:block;width:100%;height:26px;overflow:visible;opacity:.6;margin:8px 0}
.rule path{fill:none;stroke:rgba(22,48,94,.34);stroke-width:3;stroke-linecap:round}

.article .block p,.article .block li{font-size:var(--text-m);line-height:1.72}
.article .block{padding:30px 0 4px}
.steps{max-width:780px;margin:6px 0 14px;padding:0;list-style:none;counter-reset:s}
.steps li{
  position:relative;padding-left:52px;margin-bottom:16px;
  font-size:var(--text-m);line-height:1.72;color:var(--ink3);counter-increment:s;
}
.steps li::before{
  content:counter(s);position:absolute;left:0;top:-1px;
  width:34px;height:34px;border:2.6px solid var(--ink);border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--disp);font-weight:800;font-size:var(--text-m);color:var(--ink);
  background:var(--paper);box-shadow:3px 3px 0 rgba(10,23,48,.16);
}
.steps li strong{color:var(--ink);font-weight:700}

.closing{position:relative;height:190px;margin-top:30px;overflow:hidden}
.closing svg{width:100%;height:100%;display:block;overflow:visible}
.closing .ln{fill:none;stroke:rgba(29,78,216,.4);stroke-width:3.2;stroke-linecap:round;stroke-linejoin:round}

footer{padding:26px 0 46px;font-size:var(--text-s);color:var(--soft);position:relative}
footer::before{
  content:"";position:absolute;left:28px;right:28px;top:0;height:2px;
  background:linear-gradient(90deg,transparent,rgba(22,48,94,.22) 10%,rgba(22,48,94,.22) 90%,transparent);
}
.foot-in{max-width:1120px;margin:0 auto;padding:0 28px;display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
.foot-links{display:flex;gap:22px}
.foot-links a:hover{color:var(--blue)}

.back-row{margin-top:36px}

@media (prefers-reduced-motion:reduce){
  .boil{animation:none}
}
@media (max-width:820px){
  .nav-links .hide-m{display:none}
}
@media (max-width:560px){
  .page-head{padding-top:106px}
}