/* ===================================================================
   hp-tank315.ru — дизайн-система «Ink Gauge»
   Сигнатурный элемент: индикатор уровня чернил C/M/Y/K, который
   встречается в hero, как разделитель секций и как заливка кнопок.
   Только системные шрифты — ради максимальной скорости загрузки.
=================================================================== */

:root{
  --ink-black:#0B1220;
  --ink-black-2:#121B2E;
  --paper:#F4F6F4;
  --paper-2:#FFFFFF;
  --cyan:#00AEEF;
  --magenta:#EC1E6F;
  --yellow:#FFC629;
  --key:#1B2430;
  --text:#1B2430;
  --text-soft:#5B6472;
  --border:#E1E5E2;
  --radius:14px;
  --shadow:0 8px 30px -12px rgba(11,18,32,.18);
  --font-display:"Segoe UI",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,sans-serif;
  --font-body:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"Cascadia Code","Consolas",monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--text);
  background:var(--paper);
  line-height:1.6;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--cyan);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.15;
  letter-spacing:-.01em;
  margin:0 0 .6em;
  color:var(--ink-black);
}
h1{font-size:clamp(1.9rem,4vw,2.7rem)}
h2{font-size:clamp(1.5rem,3vw,2rem)}
h3{font-size:1.25rem}
p{margin:0 0 1.1em}
ul,ol{margin:0 0 1.1em;padding-left:1.3em}
li{margin-bottom:.4em}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:3px solid var(--cyan);outline-offset:2px}

/* ---------- Ink-bar: сигнатурный разделитель C/M/Y/K ---------- */
.ink-bar{
  display:flex;height:6px;width:72px;border-radius:6px;overflow:hidden;margin:0 0 1.4em;
}
.ink-bar span{flex:1}
.ink-bar .c{background:var(--cyan)}
.ink-bar .m{background:var(--magenta)}
.ink-bar .y{background:var(--yellow)}
.ink-bar .k{background:var(--key)}
.ink-bar.center{margin-left:auto;margin-right:auto}

.eyebrow{
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--text-soft);
  display:flex;align-items:center;gap:.5em;
  margin-bottom:.7em;
}
.eyebrow::before{
  content:"";
  width:8px;height:8px;border-radius:50%;
  background:conic-gradient(var(--cyan),var(--magenta),var(--yellow),var(--key));
}

/* ---------- Header ---------- */
.site-header{
  background:var(--ink-black);
  color:#fff;
  position:sticky;top:0;z-index:50;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.site-header .bar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 20px;max-width:1080px;margin:0 auto;gap:16px;
}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:1.05rem;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand .drops{display:flex;gap:3px}
.brand .drops i{width:7px;height:10px;border-radius:60% 60% 60% 0;transform:rotate(45deg);display:block}
.brand .drops i:nth-child(1){background:var(--cyan)}
.brand .drops i:nth-child(2){background:var(--magenta)}
.brand .drops i:nth-child(3){background:var(--yellow)}
.brand .drops i:nth-child(4){background:#fff}

nav.mainnav{display:flex;gap:4px;flex-wrap:wrap}
nav.mainnav a{
  color:rgba(255,255,255,.78);font-size:.92rem;padding:8px 10px;border-radius:8px;
}
nav.mainnav a:hover,nav.mainnav a.active{background:rgba(255,255,255,.1);color:#fff;text-decoration:none}
.nav-toggle{display:none;background:none;border:0;color:#fff;font-size:1.5rem;cursor:pointer;padding:4px 8px}
.lang-switch{display:flex;gap:2px;background:rgba(255,255,255,.08);border-radius:8px;padding:3px}
.lang-switch a{padding:5px 10px;font-size:.82rem;border-radius:6px;color:rgba(255,255,255,.7)}
.lang-switch a.active{background:#fff;color:var(--ink-black);font-weight:700}
.lang-switch a:hover{text-decoration:none}

@media (max-width:860px){
  nav.mainnav{
    display:none;position:absolute;top:100%;left:0;right:0;background:var(--ink-black-2);
    flex-direction:column;padding:10px 20px 18px;border-bottom:1px solid rgba(255,255,255,.08);
  }
  nav.mainnav.open{display:flex}
  .nav-toggle{display:block}
}

/* ---------- Hero ---------- */
.hero{
  background:
    radial-gradient(1200px 400px at 15% -10%, rgba(0,174,239,.25), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, rgba(236,30,111,.2), transparent 55%),
    var(--ink-black);
  color:#fff;padding:56px 0 64px;position:relative;overflow:hidden;
}
.hero .container{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.hero h1{color:#fff}
.hero p.lead{color:rgba(255,255,255,.82);font-size:1.08rem;max-width:52ch}
.hero .eyebrow{color:rgba(255,255,255,.65)}

/* Ink gauge — 4 tubes SVG-like via divs */
.gauge{display:flex;gap:14px;align-items:flex-end;height:150px;justify-content:center}
.gauge .tube{
  width:26px;height:150px;border-radius:8px;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.18);
  position:relative;overflow:hidden;
}
.gauge .tube .fill{
  position:absolute;bottom:0;left:0;right:0;border-radius:0 0 7px 7px;
  animation:fillUp 1.8s cubic-bezier(.2,.9,.2,1) both;
}
.gauge .tube.c .fill{background:var(--cyan);height:78%;animation-delay:.05s}
.gauge .tube.m .fill{background:var(--magenta);height:64%;animation-delay:.2s}
.gauge .tube.y .fill{background:var(--yellow);height:88%;animation-delay:.35s}
.gauge .tube.k .fill{background:#fff;height:52%;animation-delay:.5s}
.gauge .label{
  position:absolute;bottom:6px;left:0;right:0;text-align:center;
  font-family:var(--font-mono);font-size:.62rem;color:rgba(0,0,0,.45);
}
@keyframes fillUp{from{height:0}}
@media (prefers-reduced-motion:reduce){
  .gauge .tube .fill{animation:none}
}

.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:1.6em}
.btn{
  --btn-c:var(--cyan);
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 22px;border-radius:10px;font-weight:700;font-size:.98rem;
  background:var(--btn-c);color:#08131f;border:none;cursor:pointer;
  position:relative;overflow:hidden;isolation:isolate;
  box-shadow:var(--shadow);
}
.btn:hover{text-decoration:none;filter:brightness(1.05)}
.btn::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(90deg,var(--cyan),var(--magenta) 50%,var(--yellow));
  transform:translateX(-100%);transition:transform .45s ease;
}
.btn:hover::before{transform:translateX(0)}
.btn .sub{display:block;font-weight:500;font-size:.74rem;opacity:.75;font-family:var(--font-mono)}
.btn.ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.3);box-shadow:none}
.btn.ghost::before{display:none}
.btn.ghost:hover{background:rgba(255,255,255,.08)}

/* ---------- Sections ---------- */
section{padding:56px 0}
section.alt{background:var(--paper-2);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center}
@media (max-width:800px){
  .grid-3{grid-template-columns:1fr 1fr}
  .grid-2{grid-template-columns:1fr}
  .hero .container{grid-template-columns:1fr}
  .hero .gauge{margin-top:20px}
}
@media (max-width:560px){.grid-3{grid-template-columns:1fr}}

.card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:22px;
}
.card h3{margin-bottom:.4em;display:flex;align-items:center;gap:10px}
.card .ico{
  width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-weight:700;font-size:.85rem;color:#fff;flex:none;
}

/* ---------- Steps (installation guide) ---------- */
.steps{counter-reset:step;position:relative}
.step{
  display:grid;grid-template-columns:56px 1fr;gap:20px;position:relative;padding-bottom:34px;
}
.step:last-child{padding-bottom:0}
.step::before{
  counter-increment:step;content:counter(step);
  width:44px;height:44px;border-radius:50%;
  background:var(--ink-black);color:#fff;font-family:var(--font-mono);font-weight:700;
  display:flex;align-items:center;justify-content:center;font-size:1.05rem;z-index:1;
}
.step:nth-child(4n+1)::before{background:var(--cyan)}
.step:nth-child(4n+2)::before{background:var(--magenta);color:#fff}
.step:nth-child(4n+3)::before{background:var(--yellow);color:#1b2430}
.step:nth-child(4n+4)::before{background:var(--key)}
.step:not(:last-child)::after{
  content:"";position:absolute;left:22px;top:44px;bottom:-2px;width:2px;
  background:repeating-linear-gradient(180deg,var(--border) 0 6px,transparent 6px 12px);
}
.step .content{padding-top:6px}
.step img{border-radius:10px;border:1px solid var(--border);margin-top:12px;box-shadow:var(--shadow)}
.step h3{margin-bottom:.3em}

/* ---------- Table ---------- */
table.specs{width:100%;border-collapse:collapse;font-size:.95rem}
table.specs th,table.specs td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--border)}
table.specs th{width:42%;color:var(--text-soft);font-weight:600}
table.specs tr:last-child th,table.specs tr:last-child td{border-bottom:none}

/* ---------- FAQ ---------- */
details.faq{
  background:#fff;border:1px solid var(--border);border-radius:12px;padding:4px 18px;margin-bottom:10px;
}
details.faq summary{
  cursor:pointer;font-weight:700;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:12px;
  color:var(--ink-black);
}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";font-family:var(--font-mono);font-size:1.3rem;color:var(--cyan);flex:none}
details.faq[open] summary::after{content:"–"}
details.faq p{padding-bottom:14px;color:var(--text-soft)}

/* ---------- OS switch strip ---------- */
.os-strip{display:flex;flex-wrap:wrap;gap:8px;margin:1.4em 0}
.os-strip a{
  padding:9px 14px;border-radius:9px;border:1px solid var(--border);background:#fff;
  font-size:.9rem;font-weight:600;color:var(--text);
}
.os-strip a:hover{border-color:var(--cyan);color:var(--cyan);text-decoration:none}
.os-strip a.active{background:var(--ink-black);border-color:var(--ink-black);color:#fff}

/* ---------- Notice / warning boxes ---------- */
.notice{
  border-left:4px solid var(--cyan);background:#fff;border-radius:0 10px 10px 0;
  padding:16px 18px;margin:1.4em 0;font-size:.96rem;
}
.notice.warn{border-color:var(--yellow)}
.notice.danger{border-color:var(--magenta)}
.notice strong{color:var(--ink-black)}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink-black);color:rgba(255,255,255,.7);padding:44px 0 26px;font-size:.92rem}
.site-footer a{color:rgba(255,255,255,.8)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px;margin-bottom:28px}
.footer-grid h4{color:#fff;font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:.9em}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{margin-bottom:.5em}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:.82rem;color:rgba(255,255,255,.5)}
@media (max-width:700px){.footer-grid{grid-template-columns:1fr}}

/* ---------- Cookie consent ---------- */
#cookie-consent{
  position:fixed;left:16px;right:16px;bottom:16px;z-index:200;
  max-width:640px;margin:0 auto;background:var(--ink-black);color:#fff;
  border-radius:14px;padding:18px 20px;box-shadow:0 20px 50px -10px rgba(0,0,0,.5);
  display:none;gap:14px;align-items:center;flex-wrap:wrap;
}
#cookie-consent.show{display:flex}
#cookie-consent p{margin:0;font-size:.88rem;color:rgba(255,255,255,.85);flex:1 1 260px}
#cookie-consent .actions{display:flex;gap:10px}
#cookie-consent button{
  border:none;border-radius:8px;padding:9px 16px;font-weight:700;font-size:.85rem;cursor:pointer;
}
#cookie-accept{background:var(--cyan);color:#08131f}
#cookie-more{background:transparent;color:#fff;text-decoration:underline;padding-left:2px;padding-right:2px}

/* ---------- Article prose ---------- */
.prose{max-width:74ch}
.prose h2{margin-top:1.4em}
.article-wrap{display:grid;grid-template-columns:1fr 260px;gap:44px}
@media (max-width:900px){.article-wrap{grid-template-columns:1fr}}
.side{align-self:start;position:sticky;top:84px}
.side .card{padding:18px}
.side .card h3{font-size:1rem}
.toc{font-size:.88rem}
.toc a{display:block;padding:5px 0;color:var(--text-soft)}
.toc a:hover{color:var(--cyan);text-decoration:none}