/* ===== Centrum Filtracji — Konfigurator (Dobór techniczny) ===== */

.cfk{
  --cfk-bg:#0f1216; --cfk-blue:#028DCF; --cfk-blue-dark:#0277ad;
  --cfk-ink:#1c1f24; --cfk-mute:#5a626b; --cfk-line:#e4e7ea;
  --cfk-ease:cubic-bezier(.22,1,.36,1);
  font-family:"Inter",system-ui,-apple-system,sans-serif;
}
.cfk *{ box-sizing:border-box; }

/* ===== baner ===== */
.cfk-banner{
  position:relative; overflow:hidden;
  display:grid; grid-template-columns:1fr auto; gap:28px; align-items:center;
  background:var(--cfk-bg); color:#fff;
  padding:clamp(26px,3vw,38px) clamp(24px,3vw,40px);
}
.cfk-banner::before{
  content:""; position:absolute; top:-40%; right:22%; width:340px; height:180%;
  background:repeating-linear-gradient(115deg, rgba(2,141,207,.16) 0 2px, transparent 2px 16px);
  transform:skewX(-12deg); pointer-events:none;
}
.cfk-banner__main{ position:relative; z-index:1; }
.cfk-eyebrow{
  display:inline-flex; align-items:center; gap:10px;
  font-size:11.5px; font-weight:600; letter-spacing:.14em; text-transform:uppercase;
  color:var(--cfk-blue); margin-bottom:12px;
}
.cfk-eyebrow::before{ content:""; width:24px; height:2px; background:var(--cfk-blue); }
.cfk-title{
  font-size:clamp(21px,2.3vw,30px); font-weight:800; letter-spacing:-.02em; line-height:1.14;
  margin:0 0 10px; color:inherit;
}
.cfk-desc{
  font-size:15px; line-height:1.6; color:rgba(255,255,255,.72);
  max-width:560px; margin:0;
}
.cfk-tags{ display:flex; flex-wrap:wrap; gap:8px; margin-top:16px; }
.cfk-tag{
  font-size:12px; font-weight:500; color:rgba(255,255,255,.82);
  border:1px solid rgba(255,255,255,.16); padding:5px 11px;
}
.cfk-banner__action{ position:relative; z-index:1; }
.cfk-btn{
  display:inline-flex; align-items:center; gap:11px;
  background:var(--cfk-blue); color:#fff; border:2px solid var(--cfk-blue);
  font-family:inherit; font-size:15px; font-weight:700; letter-spacing:.01em;
  padding:17px 30px; cursor:pointer; white-space:nowrap;
  transition:background .25s var(--cfk-ease), border-color .25s var(--cfk-ease), transform .25s var(--cfk-ease);
}
.cfk-btn:hover{ background:var(--cfk-blue-dark); border-color:var(--cfk-blue-dark); transform:translateY(-2px); }
.cfk-btn svg{ width:18px; height:18px; flex:none; }

/* ===== popup ===== */
.cfk-overlay{
  position:fixed; inset:0; z-index:99999;
  background:rgba(15,18,22,.6); backdrop-filter:blur(3px);
  display:flex; align-items:center; justify-content:center; padding:20px;
  opacity:0; transition:opacity .3s var(--cfk-ease);
}
.cfk-overlay[hidden]{ display:none; }
.cfk-overlay.is-open{ opacity:1; }
.cfk-modal{
  position:relative; background:#fff; width:100%; max-width:560px;
  max-height:88vh; overflow:auto; border-top:4px solid var(--cfk-blue);
  transform:translateY(14px); transition:transform .35s var(--cfk-ease);
}
.cfk-overlay.is-open .cfk-modal{ transform:translateY(0); }
.cfk-close{
  position:absolute; top:16px; right:16px; width:34px; height:34px;
  display:flex; align-items:center; justify-content:center;
  background:#f5f7f9; border:1px solid var(--cfk-line); cursor:pointer; color:var(--cfk-ink);
  transition:background .2s, color .2s, border-color .2s;
}
.cfk-close:hover{ background:var(--cfk-bg); color:#fff; border-color:var(--cfk-bg); }
.cfk-close svg{ width:16px; height:16px; }
.cfk-modal__head{ padding:26px 30px 0; }
.cfk-modal__eyebrow{
  font-size:11px; font-weight:600; letter-spacing:.14em; text-transform:uppercase; color:var(--cfk-blue);
}
.cfk-modal__title{
  font-size:22px; font-weight:800; letter-spacing:-.02em; color:var(--cfk-bg); margin:7px 0 4px;
}
.cfk-modal__sub{ font-size:14px; color:var(--cfk-mute); margin:0; line-height:1.55; }
.cfk-modal__body{ padding:20px 30px 30px; }
.cfk-empty{ color:var(--cfk-mute); font-size:14px; }

/* ===== RWD ===== */
@media (max-width:780px){
  .cfk-banner{ grid-template-columns:1fr; gap:20px; }
  .cfk-banner__action .cfk-btn{ width:100%; justify-content:center; }
}

@media (prefers-reduced-motion:reduce){
  .cfk-btn,.cfk-overlay,.cfk-modal,.cfk-close{ transition:none !important; }
}