/* ==========================================================================
   NeuroNutrition — tokeny
   Paleta: wartości z projektu strony i katalogu; limonka = wypełnienie wektorów w pliku logo.
   ========================================================================== */
.bk {
  --lime: #C0F229;          /* Limonka — akcenty strony i katalogu */
  --ink: #121311;           /* Grafit tła */
  --card: #353632;          /* Grafit kart */
  --gray: #B8B8B8;          /* Szarość tekstu */
  --white: #F8F8F8;         /* Biel */
  --logo-lime: #C0F229;     /* limonka logo — ujednolicona z paletą strony (w pliku nn-log.svg: #BCCF21) */
  --logo-white: #FAFAFA;    /* „Nutrition” na ciemnym tle — z aktualnego pliku logo */
  --logo-ink: #333333;      /* „Nutrition” na bieli — z pliku logo */
  --logo-deep: #253000;     /* wersja jednobarwna na limonce — z pliku logo */

  /* Pochodne prezentacji */
  --black: #0A0B0A;
  --deep: #0D0E0C;
  --line: rgba(248, 248, 248, .12);
  --line-strong: rgba(248, 248, 248, .24);
  --line-light: rgba(18, 19, 17, .14);
  --muted: #A9ABA6;          /* 7.9:1 na #121311 */
  --muted-light: #4D4F4A;    /* 7.6:1 na #F8F8F8 */
  --lime-glow: rgba(192, 242, 41, .35);

  /* Kolory logo w SVG inline — przełączane per kontekst */
  --lg-sign: var(--logo-lime);
  --lg-neuro: var(--logo-lime);
  --lg-nutri: var(--logo-white);

  --f-head: "Nohemi", sans-serif;
  --f-body: "Manrope", sans-serif;

  --fs-hero: clamp(2.5rem, 1rem + 4.6vw, 6.2rem);
  --fs-h2: clamp(2rem, 1.1rem + 2.6vw, 4rem);
  --fs-h3: clamp(1.4rem, 1.1rem + 1.1vw, 2.2rem);
  --fs-lead: clamp(1.08rem, .98rem + .5vw, 1.45rem);
  --fs-body: clamp(.98rem, .95rem + .15vw, 1.075rem);
  --fs-small: .875rem;
  --fs-micro: .75rem;

  --gutter: clamp(16px, 4.2vw, 72px);
  --maxw: 1600px;
  --pad-x: max(var(--gutter), calc((100vw - var(--maxw)) / 2));
  --sp-s: 1rem;
  --sp-m: clamp(1.5rem, 1rem + 1.5vw, 2.5rem);
  --sp-l: clamp(3rem, 2rem + 4vw, 6.5rem);
  --sp-xl: clamp(5rem, 3rem + 8vw, 11rem);
  /* Wysokość nagłówka strony nadrzędnej (portfolio) nad paskiem rozdziałów — przy osadzeniu ustaw np. 80px */
  --site-offset: 72px;
  --header-h: 56px;
  --nav-h: calc(var(--site-offset) + var(--header-h));

  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --ease-io: cubic-bezier(.65, 0, .35, 1);
}

/* ==========================================================================
   NeuroNutrition — reset, typografia, wspólne kontrolki
   ========================================================================== */
:where(.bk) *, :where(.bk) *::before, :where(.bk) *::after { box-sizing: border-box; }
html.bk-page { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
html.bk-page.bk-motion { scroll-behavior: auto; }
.bk {
  margin: 0; background: var(--ink); color: var(--white);
  font-family: var(--f-body); font-size: var(--fs-body); line-height: 1.65;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; overflow-x: clip;
}
:where(.bk) img, :where(.bk) svg, :where(.bk) canvas { display: block; max-width: 100%; }
:where(.bk) img { height: auto; }
:where(.bk) h1, :where(.bk) h2, :where(.bk) h3, :where(.bk) p, :where(.bk) ol, :where(.bk) ul, :where(.bk) dl, :where(.bk) dd, :where(.bk) figure { margin: 0; }
:where(.bk) ol, :where(.bk) ul { padding: 0; list-style: none; }
:where(.bk) button, :where(.bk) input, :where(.bk) textarea { font: inherit; color: inherit; }
:where(.bk) button { cursor: pointer; background: none; border: 0; padding: 0; }
:where(.bk) a { color: inherit; }
:where(.bk) ::selection { background: var(--lime); color: var(--ink); }
:where(.bk) :focus-visible { outline: 2px solid var(--lime); outline-offset: 4px; border-radius: 2px; }

.bk-visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.bk-skip-link {
  position: fixed; left: 16px; top: -60px; z-index: 200; background: var(--lime); color: var(--ink);
  padding: .7rem 1rem; font-weight: 600; text-decoration: none; transition: top .3s;
}
.bk-skip-link:focus { top: calc(var(--site-offset) + 12px); }

:where(.bk) [data-mark] svg, :where(.bk) [data-sign] svg, :where(.bk) [data-word] svg, :where(.bk) [data-sketch] svg { width: 100%; height: auto; overflow: visible; }
:where(.bk) [data-mark], :where(.bk) [data-sign], :where(.bk) [data-word] { display: block; line-height: 0; }

/* ---------- Typografia ---------- */
.bk-wrap { padding-inline: var(--pad-x); }
.bk-h2 {
  font-family: var(--f-head); font-size: var(--fs-h2); font-weight: 600; line-height: .96;
  letter-spacing: -0.011em; max-width: 13ch; text-wrap: balance;
}
.bk-h3 { font-family: var(--f-head); font-size: var(--fs-h3); font-weight: 600; line-height: 1.1; letter-spacing: -0.006em; text-wrap: balance; }
.bk-lead { font-size: var(--fs-lead); line-height: 1.5; letter-spacing: -0.003em; }
.bk-label { font-family: var(--f-head); font-size: var(--fs-micro); font-weight: 500; letter-spacing: .01em; color: var(--muted); }
.bk-note { font-size: var(--fs-small); line-height: 1.55; color: var(--muted-light); max-width: 64ch; }
.bk-note--dark, .bk-ch--ink .bk-note, .bk-ch--deep .bk-note, .bk-ch--black .bk-note { color: var(--muted); }
.bk-ch--paper .bk-label { color: var(--muted-light); }

.bk-eyebrow { display: flex; align-items: center; gap: 14px; margin-bottom: var(--sp-m); font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .01em; }
.bk-eyebrow__num { color: var(--lime); font-weight: 600; }
.bk-eyebrow__num::after { content: ""; display: inline-block; width: 40px; height: 1px; background: currentColor; opacity: .6; vertical-align: middle; margin-left: 14px; }
.bk-eyebrow__label { color: var(--muted); }
.bk-ch--paper .bk-eyebrow__num { color: var(--ink); }
.bk-ch--paper .bk-eyebrow__label { color: var(--muted-light); }

/* Linie dzielone na słowa (data-split) */
.bk-split-line { display: inline-block; overflow: hidden; padding-bottom: .08em; margin-bottom: -.08em; vertical-align: top; }
.bk-split-word { display: inline-block; will-change: transform; }

/* ---------- Rozdziały ---------- */
.bk-ch { position: relative; }
.bk-ch--ink { background: var(--ink); color: var(--white); }
.bk-ch--deep { background: var(--deep); color: var(--white); }
.bk-ch--black { background: var(--black); color: var(--white); }
.bk-ch--paper { background: var(--white); color: var(--ink); --lg-nutri: var(--logo-ink); }
.bk-ch--paper :focus-visible { outline-color: var(--ink); }

/* ---------- Kontrolki ---------- */
.bk-chip {
  min-height: 42px; padding: .5rem 1.05rem; border: 1px solid var(--line-strong); border-radius: 99px;
  font-family: var(--f-head); font-size: var(--fs-small); font-weight: 500; color: var(--white);
  transition: border-color .3s, background-color .3s, color .3s;
}
.bk-chip:hover { border-color: var(--lime); }
.bk-chip[aria-pressed="true"], .bk-chip[aria-checked="true"] { background: var(--lime); border-color: var(--lime); color: var(--ink); }
.bk-chip--dark { color: var(--ink); border-color: var(--line-light); }
.bk-chip--dark:hover { border-color: var(--ink); }
.bk-chip--dark[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--white); }

.bk-seg { display: inline-flex; flex-wrap: wrap; gap: 4px; padding: 4px; border: 1px solid var(--line); border-radius: 99px; }
.bk-seg button {
  min-height: 38px; padding: .4rem .95rem; border-radius: 99px; font-family: var(--f-head); font-size: var(--fs-small); font-weight: 500;
  color: var(--muted); transition: background-color .3s, color .3s;
}
.bk-seg button:hover { color: var(--white); }
.bk-seg button:disabled { opacity: .32; cursor: not-allowed; }
.bk-seg button:disabled:hover { color: var(--muted); }
.bk-seg button[aria-checked="true"], .bk-seg button[aria-pressed="true"] { background: var(--lime); color: var(--ink); }

.bk-range { display: grid; gap: .35rem; font-family: var(--f-head); font-size: var(--fs-small); color: var(--muted); min-width: 160px; }
.bk-range output { color: var(--white); font-variant-numeric: tabular-nums; }
:where(.bk) input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 28px; background: transparent; cursor: pointer; }
:where(.bk) input[type="range"]::-webkit-slider-runnable-track { height: 2px; background: var(--line-strong); }
:where(.bk) input[type="range"]::-moz-range-track { height: 2px; background: var(--line-strong); }
:where(.bk) input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; margin-top: -8px; border-radius: 50%; background: var(--lime); border: 0; }
:where(.bk) input[type="range"]::-moz-range-thumb { width: 18px; height: 18px; border-radius: 50%; background: var(--lime); border: 0; }
:where(.bk) input[type="range"]:focus-visible { outline-offset: 2px; }

.bk-switch { display: inline-flex; align-items: center; gap: .8rem; min-height: 44px; cursor: pointer; font-family: var(--f-head); font-size: var(--fs-small); font-weight: 500; }
.bk-switch input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.bk-switch__ui { position: relative; width: 46px; height: 26px; border-radius: 99px; border: 1px solid var(--line-strong); transition: background-color .3s, border-color .3s; }
.bk-switch__ui::after { content: ""; position: absolute; left: 3px; top: 3px; width: 18px; height: 18px; border-radius: 50%; background: var(--white); transition: transform .4s var(--ease-out), background-color .3s; }
.bk-switch input:checked + .bk-switch__ui { background: var(--lime); border-color: var(--lime); }
.bk-switch input:checked + .bk-switch__ui::after { transform: translateX(20px); background: var(--ink); }
.bk-switch input:focus-visible + .bk-switch__ui { outline: 2px solid var(--lime); outline-offset: 3px; }

/* ---------- Tryb statyczny / ograniczony ruch ---------- */
html.bk-page.bk-motion:not(.bk-is-ready):not(.bk-motion-failed) [data-bk-reveal], html.bk-page.bk-motion:not(.bk-is-ready):not(.bk-motion-failed) [data-stagger] > * { opacity: 0; }

@media (prefers-reduced-motion: reduce) {
  :where(.bk) *, :where(.bk) *::before, :where(.bk) *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}
@media (max-width: 599px) { .bk-seg { border-radius: 22px; } }

/* ==========================================================================
   NeuroNutrition — nawigacja, postęp, menu, toast
   ========================================================================== */
.bk-progress { position: fixed; inset: auto 0 0 0; height: 2px; z-index: 120; background: rgba(184,184,184,.16); pointer-events: none; }
.bk-progress__bar { display: block; height: 100%; background: var(--lime); transform-origin: 0 50%; transform: scaleX(0); box-shadow: 0 0 12px var(--lime-glow); }
.bk-site-header[data-nav-theme="light"] ~ .bk-progress .bk-progress__bar { background: var(--ink); box-shadow: none; }

.bk-site-header {
  position: fixed; inset: var(--site-offset) 0 auto 0; z-index: 110; height: var(--header-h);
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: clamp(14px, 3vw, 40px);
  padding-inline: var(--gutter); color: var(--white); transition: color .5s var(--ease-out);
}
.bk-site-header::before {
  content: ""; position: absolute; inset: 0; z-index: -1; opacity: 0;
  background: rgba(18,19,17,.8); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line); transition: opacity .5s var(--ease-out), background-color .5s var(--ease-out), border-color .5s;
}
.bk-site-header.bk-is-scrolled::before { opacity: 1; }
.bk-site-header[data-nav-theme="light"] { color: var(--ink); --lg-nutri: var(--logo-ink); }
.bk-site-header[data-nav-theme="light"]::before { background: rgba(248,248,248,.86); border-bottom-color: var(--line-light); }
.bk-site-header[data-nav-theme="lime"] { color: var(--ink); --lg-sign: var(--logo-deep); --lg-neuro: var(--logo-deep); --lg-nutri: var(--logo-deep); }
.bk-site-header[data-nav-theme="lime"]::before { background: rgba(192,242,41,.9); border-bottom-color: rgba(18,19,17,.12); }
.bk-site-header__brand { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; }
.bk-site-header__logo { width: 150px; }
.bk-site-header__chapter { min-width: 0; overflow: hidden; display: flex; align-items: center; gap: 12px; font-family: var(--f-head); font-size: 11px; letter-spacing: .01em; white-space: nowrap; }
.bk-site-header__num { font-variant-numeric: tabular-nums; font-weight: 600; }
.bk-site-header__sep { width: 24px; height: 1px; background: currentColor; opacity: .45; flex: none; }
.bk-site-header__title { opacity: .78; overflow: hidden; text-overflow: ellipsis; }
.bk-menu-btn { justify-self: end; display: inline-flex; align-items: center; gap: 12px; height: 44px; padding: 0 0 0 10px; font-family: var(--f-head); font-size: 11px; letter-spacing: .01em; }
.bk-menu-btn__icon { position: relative; width: 30px; height: 30px; border: 1px solid currentColor; border-radius: 50%; transition: transform .5s var(--ease-out); }
.bk-menu-btn__icon i { position: absolute; left: 9px; right: 9px; height: 1px; background: currentColor; }
.bk-menu-btn__icon i:first-child { top: 12px; }
.bk-menu-btn__icon i:last-child { top: 16px; }
.bk-menu-btn:hover .bk-menu-btn__icon { transform: rotate(90deg); }
@media (max-width: 599px) {
  .bk-menu-btn__label, .bk-site-header__title { display: none; }
  .bk-site-header__logo { width: 124px; }
}
@media (max-width: 359px) { .bk-site-header__chapter { display: none; } }

.bk-rail { position: fixed; right: clamp(12px, 1.4vw, 26px); top: 50%; z-index: 100; transform: translateY(-50%); display: none; color: var(--white); transition: color .5s var(--ease-out); }
.bk-rail[data-nav-theme="light"], .bk-rail[data-nav-theme="lime"] { color: var(--ink); }
.bk-rail__list { display: flex; flex-direction: column; gap: 2px; }
.bk-rail__link { position: relative; display: flex; align-items: center; justify-content: flex-end; width: 32px; height: 20px; text-decoration: none; }
.bk-rail__tick { width: 10px; height: 1px; background: currentColor; opacity: .38; transition: width .45s var(--ease-out), opacity .45s var(--ease-out), background-color .4s; }
.bk-rail__label { position: absolute; right: 30px; top: 50%; transform: translate(8px, -50%); white-space: nowrap; font-family: var(--f-head); font-size: 11px; letter-spacing: .01em; opacity: 0; pointer-events: none; transition: opacity .35s var(--ease-out), transform .35s var(--ease-out); }
.bk-rail__label b { font-weight: 600; margin-right: 8px; font-variant-numeric: tabular-nums; }
.bk-rail__link:hover .bk-rail__tick, .bk-rail__link:focus-visible .bk-rail__tick { width: 22px; opacity: 1; }
.bk-rail__link:hover .bk-rail__label, .bk-rail__link:focus-visible .bk-rail__label { opacity: 1; transform: translate(0, -50%); }
.bk-rail__link[aria-current="true"] .bk-rail__tick { width: 26px; opacity: 1; height: 2px; background: var(--lime); }
.bk-rail[data-nav-theme="light"] .bk-rail__link[aria-current="true"] .bk-rail__tick, .bk-rail[data-nav-theme="lime"] .bk-rail__link[aria-current="true"] .bk-rail__tick { background: var(--ink); }
@media (min-width: 1024px) { .bk-rail { display: block; } }

.bk-menu { position: fixed; inset: 0; z-index: 150; background: var(--black); color: var(--white); overflow-y: auto; display: flex; align-items: flex-start; }
.bk-menu[hidden] { display: none; }
.bk-menu__inner { width: 100%; max-width: 1400px; margin: 0 auto; padding: calc(var(--site-offset) + 1.1rem) var(--gutter) 2rem; }
.bk-menu__head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: var(--sp-m); }
.bk-menu__eyebrow { font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .01em; color: var(--muted); }
.bk-menu__list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: var(--sp-l); border-top: 1px solid var(--line); }
.bk-menu__list li { border-bottom: 1px solid var(--line); }
.bk-menu__list a { display: flex; align-items: baseline; gap: 1.2rem; padding: .9rem 0; text-decoration: none; font-family: var(--f-head); font-size: clamp(1.3rem, 1rem + 1.2vw, 2.2rem); font-weight: 600; letter-spacing: -0.009em; line-height: 1.1; transition: color .3s, padding .4s var(--ease-out); }
.bk-menu__list a span { font-size: var(--fs-micro); font-weight: 500; letter-spacing: .08em; color: var(--lime); min-width: 2em; }
.bk-menu__list a:hover, .bk-menu__list a:focus-visible, .bk-menu__list a[aria-current="true"] { padding-left: .6rem; color: var(--lime); }
.bk-menu__foot { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-top: var(--sp-m); }
.bk-menu__top, .bk-menu__close { min-height: 44px; display: inline-flex; align-items: center; gap: .5rem; text-decoration: none; font-family: var(--f-head); letter-spacing: .01em; font-size: var(--fs-micro); }
.bk-menu__close span { font-size: 1.1rem; }
@media (max-width: 767px) { .bk-menu__list { grid-template-columns: 1fr; } }

.bk-toast {
  position: fixed; left: 50%; bottom: 28px; z-index: 260; transform: translate(-50%, calc(100% + 48px));
  background: var(--lime); color: var(--ink); padding: .8rem 1.2rem; font-family: var(--f-head); font-size: var(--fs-small); font-weight: 600;
  box-shadow: 0 14px 40px rgba(0,0,0,.4); transition: transform .5s var(--ease-out), visibility .5s; pointer-events: none; visibility: hidden;
}
.bk-toast.bk-is-visible { transform: translate(-50%, 0); visibility: visible; }
.bk-toast i { display: inline-block; width: .9em; height: .9em; margin-right: .55em; vertical-align: -.1em; box-shadow: inset 0 0 0 1px rgba(18,19,17,.3); }

/* ==========================================================================
   NeuroNutrition — rozdziały 01–14
   Desktop (≥1024 px): sceny przypinane przez ScrollTrigger. Mniejsze ekrany: zwykły przepływ.
   ========================================================================== */

/* ---------- 01 — Otwarcie ---------- */
.bk-hero { min-height: calc(100vh - var(--site-offset)); min-height: calc(100svh - var(--site-offset)); display: grid; grid-template-rows: minmax(0, 1fr) auto; overflow: hidden; padding-top: var(--header-h); isolation: isolate; }
.bk-hero__lines { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; }
.bk-hero { background: radial-gradient(circle at 50% 42%, rgba(188,207,33,.09), transparent 46%), var(--ink); }
.bk-hero__lines path { fill: none; stroke-linecap: round; }
.bk-hero__lines .bk-axis { stroke: rgba(248,248,248,.08); stroke-width: 1; }
.bk-hero__lines .bk-ring { stroke: rgba(188,207,33,.16); stroke-width: 1; }
.bk-hero__lines .bk-ring--main { stroke: rgba(188,207,33,.32); }
.bk-hero__lines .bk-tick { stroke: rgba(188,207,33,.45); stroke-width: 1; }
.bk-hero__lines .bk-tick--major { stroke: rgba(188,207,33,.8); }
.bk-hero__stage { position: relative; display: grid; place-items: center; align-content: center; gap: clamp(1rem, 2.4vh, 2rem); padding: clamp(1.5rem, 4vh, 3rem) var(--gutter) 0; }
.bk-hero__dot { position: absolute; left: 50%; top: 50%; width: 10px; height: 10px; margin: -5px 0 0 -5px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 24px 6px var(--lime-glow); opacity: 0; }
.bk-hero__logo { width: clamp(240px, 32vw, 520px); filter: drop-shadow(0 0 28px rgba(192,242,41,.18)); }
.bk-hero__kicker { font-family: var(--f-head); font-size: clamp(.7rem, .6rem + .3vw, .85rem); letter-spacing: .01em; color: var(--muted); padding-left: .42em; }
.bk-hero__foot { display: grid; gap: clamp(1.2rem, 3.2vh, 2.2rem); padding: var(--sp-m) var(--pad-x) clamp(1.2rem, 3vh, 2.2rem); }
.bk-hero__title { font-family: var(--f-head); font-size: clamp(2.6rem, 1rem + 5.4vw, 7.6rem); font-weight: 600; line-height: .92; letter-spacing: -0.013em; }
.bk-hero__title .bk-line { display: block; overflow: hidden; padding-bottom: .06em; }
.bk-hero__title .bk-line > span { display: inline-block; }
.bk-hero__title .bk-line:last-child { color: var(--lime); }
.bk-facts { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: var(--sp-m); padding-top: 1.1rem; border-top: 1px solid var(--line-strong); }
.bk-facts__list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.bk-facts__item { padding-right: clamp(1rem, 2vw, 2rem); }
.bk-facts__item + .bk-facts__item { padding-left: clamp(1rem, 2vw, 2rem); border-left: 1px solid var(--line); }
.bk-facts dt { font-family: var(--f-head); font-size: var(--fs-micro); font-weight: 500; letter-spacing: .01em; color: var(--lime); margin-bottom: .45rem; }
.bk-facts dd { font-family: var(--f-head); font-size: clamp(.98rem, .9rem + .3vw, 1.2rem); font-weight: 500; line-height: 1.3; letter-spacing: -0.003em; max-width: 28ch; }
.bk-scroll-cue { display: inline-flex; align-items: center; gap: 14px; min-height: 44px; text-decoration: none; font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .01em; color: var(--muted); }
.bk-scroll-cue__line { position: relative; width: 1px; height: 44px; background: var(--line-strong); overflow: hidden; }
.bk-scroll-cue__line::after { content: ""; position: absolute; left: 0; top: -40%; width: 1px; height: 40%; background: var(--lime); animation: bk-cue 2.2s var(--ease-io) infinite; }
@keyframes bk-cue { to { top: 100%; } }
@media (max-width: 899px) {
  .bk-facts { grid-template-columns: 1fr; }
  .bk-facts__list { grid-template-columns: 1fr; }
  .bk-facts__item { padding: .8rem 0; border-bottom: 1px solid var(--line); }
  .bk-facts__item + .bk-facts__item { padding-left: 0; border-left: 0; }
  .bk-facts__item:first-child { padding-top: 0; }
  .bk-hero__logo { width: min(72vw, 360px); }
}

/* ---------- 02 — Wyzwanie ---------- */
.bk-challenge { padding-top: var(--sp-xl); overflow: clip; }
.bk-challenge__intro { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: var(--sp-l); align-items: end; padding-bottom: var(--sp-l); }
.bk-challenge__text { display: grid; gap: 1rem; color: var(--muted); max-width: 58ch; }
.bk-challenge__text .bk-lead { color: var(--white); }
.bk-challenge__stage { position: relative; min-height: 100vh; min-height: 100svh; display: grid; grid-template-rows: 1fr auto; padding: var(--nav-h) 0 var(--sp-l); }
.bk-challenge__giant { align-self: center; display: grid; padding-inline: var(--pad-x); font-family: var(--f-head); font-weight: 700; letter-spacing: -0.015em; line-height: .86; font-size: clamp(3rem, .6rem + 10.4vw, 13.5rem); }
.bk-challenge__w { display: block; }
.bk-challenge__w--a { color: transparent; -webkit-text-stroke: 1px rgba(248,248,248,.42); }
.bk-challenge__w--b { color: var(--lime); }
.bk-process { position: relative; z-index: 2; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0; }
.bk-process__item { display: grid; gap: .35rem; padding: 1.1rem 1.1rem 1.2rem 0; border-top: 1px solid var(--lime); background: var(--ink); }
.bk-process__item + .bk-process__item { padding-left: 1.1rem; border-left: 1px solid var(--line); }
.bk-process__n { font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .14em; color: var(--lime); }
.bk-process__t { font-family: var(--f-head); font-size: clamp(1.15rem, .9rem + .7vw, 1.7rem); font-weight: 600; letter-spacing: -0.006em; line-height: 1.1; }
.bk-process__d { font-size: var(--fs-small); color: var(--muted); line-height: 1.4; }
.bk-challenge__claim { padding-bottom: var(--sp-xl); font-family: var(--f-head); font-size: clamp(1.4rem, 1rem + 1.8vw, 3rem); font-weight: 500; letter-spacing: -0.009em; line-height: 1.15; color: var(--muted); }
.bk-challenge__claim b { color: var(--lime); font-weight: 600; }
@media (max-width: 1023px) {
  .bk-challenge__intro { grid-template-columns: 1fr; gap: var(--sp-m); }
  .bk-challenge__stage { min-height: 0; gap: var(--sp-m); padding-top: 0; }
  .bk-process { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 0; }
  .bk-process__item:nth-child(odd) { padding-left: 0; border-left: 0; }
  .bk-process__item:last-child { grid-column: 1 / -1; }
}

/* ---------- 03 — Dwa światy ---------- */
.bk-worlds { padding-top: var(--sp-xl); }
.bk-worlds__head { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: var(--sp-l); align-items: end; padding-bottom: var(--sp-l); }
.bk-worlds__intro { color: var(--muted); max-width: 46ch; font-size: var(--fs-lead); line-height: 1.5; }
.bk-worlds__pin { position: relative; height: 100vh; height: 100svh; display: grid; grid-template-columns: 1fr 1fr; overflow: hidden; background: var(--black); isolation: isolate; }
.bk-worlds__half { position: relative; overflow: hidden; display: grid; align-content: space-between; padding: calc(var(--nav-h) + 1.5rem) var(--gutter) 2rem; }
.bk-worlds__half--nature { background: #0d1408; }
.bk-worlds__half--neuro { background: #0b0c0b; text-align: right; }
.bk-worlds__photo { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: .82; z-index: -1; }
.bk-worlds__half--nature::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg, rgba(10,11,10,.15), rgba(10,11,10,.55)); }
.bk-worlds__net { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; }
.bk-worlds__net path { fill: none; stroke: var(--lime); stroke-width: 1; opacity: .45; vector-effect: non-scaling-stroke; }
.bk-worlds__net circle { fill: var(--lime); }
.bk-worlds__word { font-family: var(--f-head); font-weight: 700; letter-spacing: -0.015em; line-height: .8; font-size: clamp(3.2rem, 1rem + 9vw, 12rem); }
.bk-worlds__half--nature .bk-worlds__word { color: var(--white); }
.bk-worlds__half--neuro .bk-worlds__word { color: var(--lime); }
.bk-worlds__cap { font-family: var(--f-head); font-size: var(--fs-small); font-weight: 500; }
.bk-worlds__cap span { display: block; margin-top: .3rem; font-family: var(--f-body); font-size: var(--fs-micro); color: var(--muted); font-weight: 400; }
.bk-worlds__sign { position: absolute; left: 50%; top: 50%; width: clamp(160px, 26vh, 300px); transform: translate(-50%, -54%); z-index: 3; pointer-events: none; filter: drop-shadow(0 0 30px rgba(192,242,41,.25)); }
.bk-worlds__sign { aspect-ratio: 87.52 / 100; }
.bk-worlds__layer { position: absolute; inset: 0; width: 100%; height: 100%; }
.bk-worlds__half--neuro { mix-blend-mode: screen; }
.bk-worlds__q { position: absolute; left: 50%; bottom: clamp(2rem, 9vh, 6rem); width: min(90vw, 760px); transform: translateX(-50%); z-index: 3; text-align: center; font-family: var(--f-head); font-size: clamp(1.4rem, 1rem + 1.6vw, 2.8rem); font-weight: 500; letter-spacing: -0.009em; line-height: 1.15; }
.bk-worlds__q em { font-style: normal; color: var(--lime); }
@media (max-width: 1023px) {
  .bk-worlds__head { grid-template-columns: 1fr; gap: var(--sp-m); }
  .bk-worlds__pin { height: auto; grid-template-columns: 1fr; }
  .bk-worlds__half { min-height: 62svh; text-align: left; }
  .bk-worlds__sign { position: relative; left: auto; top: auto; transform: none; margin: var(--sp-l) auto var(--sp-m); }
  .bk-worlds__q { position: relative; left: auto; bottom: auto; transform: none; margin: 0 auto var(--sp-l); padding-inline: var(--gutter); }
}

/* ---------- 04 — Idea ---------- */
.bk-idea { padding-top: var(--sp-xl); }
.bk-idea__pin { padding-bottom: var(--sp-l); }
.bk-idea__pin { min-height: 100vh; min-height: 100svh; display: grid; align-items: center; padding: var(--nav-h) 0 var(--sp-m); }
.bk-idea__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: var(--sp-l); align-items: center; }
.bk-idea__text { display: grid; gap: var(--sp-m); }
.bk-idea__steps { display: grid; border-top: 1px solid var(--line); counter-reset: s; }
.bk-idea__steps li { position: relative; padding: 1rem 0 1rem 2.6rem; border-bottom: 1px solid var(--line); color: var(--muted); transition: color .5s var(--ease-out); counter-increment: s; }
.bk-idea__steps li::before { content: "0" counter(s); position: absolute; left: 0; top: 1.1rem; font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .1em; }
.bk-idea__steps li b { display: block; font-family: var(--f-head); font-size: 1.2rem; font-weight: 600; letter-spacing: -0.003em; color: var(--white); opacity: .55; transition: opacity .5s, color .5s; }
.bk-idea__steps li.bk-is-active { color: var(--white); }
.bk-idea__steps li.bk-is-active b { opacity: 1; color: var(--lime); }
.bk-idea__steps li.bk-is-active::before { color: var(--lime); }
.bk-idea__stage { position: relative; width: min(100%, 64vh); justify-self: center; aspect-ratio: .875; }
.bk-idea__stage svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.bk-idea__stage .bk-ghost { fill: none; stroke: var(--lime); stroke-width: .35; opacity: .55; }

@media (max-width: 1023px) {
  .bk-idea__pin { min-height: 0; padding-top: 0; }
  .bk-idea__grid { grid-template-columns: 1fr; }
  .bk-idea__stage { width: min(80vw, 420px); }

}

/* ---------- 05 — Symbol ---------- */
.bk-symbol { padding-block: var(--sp-xl); overflow: clip; }
.bk-symbol__head { padding-bottom: var(--sp-l); }
.bk-explorer { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(280px, 1fr); gap: var(--sp-l); align-items: center; }
.bk-explorer__stage { position: relative; display: grid; place-items: center; min-height: min(78vh, 760px); background:
  radial-gradient(circle at 50% 50%, rgba(192,242,41,.07), transparent 60%); }
.bk-explorer__sign { width: min(50%, 50vh); }
.bk-explorer__sign .bk-lg-sign path { transition: opacity .6s var(--ease-out), fill .6s; }
:where(.bk) [data-focus="brain"] .bk-explorer__sign .bk-is-leaf, :where(.bk) [data-focus="leaves"] .bk-explorer__sign .bk-is-brain { opacity: .14; }
.bk-explorer__sign .bk-an { opacity: 0; transition: opacity .6s var(--ease-out); pointer-events: none; }
.bk-explorer__sign .bk-an line, .bk-explorer__sign .bk-an rect, .bk-explorer__sign .bk-an circle, .bk-explorer__sign .bk-an path { fill: none; stroke: var(--white); stroke-width: .3; vector-effect: non-scaling-stroke; }
.bk-explorer__sign .bk-an .bk-an-lime { stroke: var(--lime); }
.bk-explorer__sign .bk-an .bk-an-dash { stroke-dasharray: 3 4; }
.bk-explorer__sign .bk-an text { fill: var(--muted); font-family: var(--f-head); font-size: 3.2px; letter-spacing: .12em; }
.bk-is-analysis .bk-explorer__sign .bk-an { opacity: .9; }
.bk-explorer__tag { position: absolute; font-family: var(--f-head); font-size: var(--fs-small); color: var(--muted); padding-top: .6rem; border-top: 1px solid var(--line-strong); width: 160px; transition: color .5s, border-color .5s; }
.bk-explorer__tag b { display: block; color: var(--white); font-weight: 600; font-size: 1.1rem; }
.bk-explorer__tag--leaves { left: 0; top: 22%; }
.bk-explorer__tag--brain { right: 0; top: 34%; text-align: right; }
.bk-explorer__tag--all { left: 50%; bottom: 2%; transform: translateX(-50%); text-align: center; }
:where(.bk) [data-focus="brain"] .bk-explorer__tag--brain, :where(.bk) [data-focus="leaves"] .bk-explorer__tag--leaves, :where(.bk) [data-focus="all"] .bk-explorer__tag--all { border-color: var(--lime); color: var(--white); }
:where(.bk) [data-focus="brain"] .bk-explorer__tag:not(.bk-explorer__tag--brain), :where(.bk) [data-focus="leaves"] .bk-explorer__tag:not(.bk-explorer__tag--leaves) { opacity: .35; }
.bk-explorer__panel { display: grid; gap: 1.2rem; align-content: center; }
.bk-explorer__btns { display: flex; flex-wrap: wrap; gap: .5rem; }
.bk-explorer__info { min-height: 9.5rem; }
.bk-explorer__info > div { display: none; }
.bk-explorer__info > div.bk-is-active { display: block; animation: bk-fadeUp .5s var(--ease-out); }
.bk-explorer__info dt { font-family: var(--f-head); font-size: var(--fs-h3); font-weight: 600; letter-spacing: -0.006em; color: var(--lime); margin-bottom: .4rem; }
.bk-explorer__info dd { color: var(--muted); max-width: 40ch; }
@keyframes bk-fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@media (max-width: 1023px) {
  .bk-explorer { grid-template-columns: 1fr; gap: var(--sp-m); }
  .bk-explorer__stage { min-height: 0; padding-block: 2rem; }
  .bk-explorer__sign { width: min(62vw, 360px); }
  .bk-explorer__tag { display: none; }
}

/* ---------- 06 — Konstrukcja i skala ---------- */
.bk-scale { padding-top: var(--sp-xl); overflow: clip; }
.bk-scale__head { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: var(--sp-l); align-items: end; }
.bk-scale__intro { color: var(--muted-light); font-size: var(--fs-lead); line-height: 1.5; max-width: 44ch; }
.bk-scale__pin { min-height: 100vh; min-height: 100svh; display: grid; align-items: center; padding: var(--nav-h) 0 var(--sp-m); }
.bk-scale__row { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); gap: var(--sp-l); align-items: center; }
.bk-scale__big { display: grid; place-items: center; min-height: 64vh; }
.bk-scale__big > div { width: min(100%, 52vh); transform-origin: 50% 50%; }
.bk-scale__big .bk-lg-sign { fill: var(--ink); }
.bk-scale__uses { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(10px, 1.2vw, 20px); }
.bk-use { position: relative; display: grid; gap: .5rem; }
.bk-use img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: #e9eae6; }
.bk-use--lid img { object-position: 50% 4%; object-fit: cover; transform-origin: 50% 0; }
.bk-use--web img { object-position: 50% 0; }
.bk-use--card img { object-position: 50% 50%; }
.bk-use > span { font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .01em; color: var(--muted-light); }
.bk-tab-mock { aspect-ratio: 4 / 3; display: flex; flex-direction: column; overflow: hidden; background: #121311; font-family: var(--f-body); color: #2a2b28; }
.bk-tab-mock__strip { flex: none; display: flex; align-items: flex-end; height: 34px; padding: 0 8px; background: #d9dad6; }
.bk-tab-mock__tab { display: flex; align-items: center; gap: 7px; width: min(62%, 220px); height: 26px; padding: 0 9px; border-radius: 7px 7px 0 0; background: #f4f4f2; font-size: 11px; }
.bk-tab-mock__title { flex: 1; min-width: 0; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.bk-tab-mock__tab i { font-style: normal; color: #777; font-size: 12px; }
.bk-tab-mock__fav { flex: none; width: 14px; height: 14px; }
.bk-tab-mock__bar { flex: none; display: flex; align-items: center; height: 28px; padding: 0 8px; background: #f4f4f2; border-bottom: 1px solid #dcdcd8; }
.bk-tab-mock__bar span { flex: 1; height: 18px; padding: 0 10px; border-radius: 99px; background: #e6e6e3; font-size: 10px; line-height: 18px; color: #555; }
.bk-tab-mock img { flex: 1; min-height: 0; width: 100%; aspect-ratio: auto; object-fit: cover; object-position: 50% 0; background: #000; }
.bk-sizes { padding-block: var(--sp-l); border-top: 1px solid var(--line-light); }
.bk-sizes__row { display: flex; flex-wrap: wrap; align-items: flex-end; gap: clamp(1.5rem, 4vw, 4.5rem); margin-block: var(--sp-m); }
.bk-sizes__row li { display: grid; gap: .8rem; justify-items: start; }
.bk-sizes__row li > span { font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .12em; color: var(--muted-light); }
.bk-sizes__box { height: var(--s); width: calc(var(--s) * .875); }
.bk-sizes__box svg { height: 100%; width: 100%; }
.bk-sizes__box .bk-lg-sign { fill: var(--ink); }
.bk-sizes__pixel canvas { width: 160px; height: 160px; image-rendering: pixelated; image-rendering: crisp-edges; box-shadow: inset 0 0 0 1px var(--line-light); background: var(--white); }
.bk-sizes__note { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-m); max-width: 1100px; color: var(--muted-light); }
.bk-sizes__note b { color: var(--ink); }
.bk-construct { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: var(--sp-l); align-items: center; padding-block: var(--sp-l) var(--sp-xl); }
.bk-construct__text { display: grid; gap: 1rem; color: var(--muted-light); justify-items: start; }
.bk-construct__text .bk-h3 { color: var(--ink); }
.bk-construct__art { background: #191c00; box-shadow: 0 30px 70px rgba(18,19,17,.25); line-height: 0; }
.bk-construct__art svg { width: 100%; height: auto; }
.bk-construct__art .bk-gl { transition: opacity .5s; }
.bk-construct__art.bk-is-off .bk-gl { opacity: 0; }
@media (max-width: 1023px) {
  .bk-scale__head, .bk-scale__row, .bk-construct { grid-template-columns: 1fr; gap: var(--sp-m); }
  .bk-scale__pin { min-height: 0; padding-top: var(--sp-l); }
  .bk-scale__big { min-height: 0; }
  .bk-scale__big > div { width: min(60vw, 300px); }
  .bk-sizes__note { grid-template-columns: 1fr; }
}

/* ---------- 07 — Logotyp ---------- */
.bk-wordmark { overflow: clip; }
.bk-wordmark__pin { position: relative; min-height: 100vh; min-height: 100svh; display: grid; align-items: center; padding: calc(var(--nav-h) + var(--sp-m)) 0 var(--sp-m); }
.bk-wordmark__grid { display: grid; grid-template-columns: minmax(280px, .75fr) minmax(0, 1.5fr); gap: var(--sp-l); align-items: center; }
.bk-wordmark__text { display: grid; gap: var(--sp-m); }
.bk-wordmark__text .bk-eyebrow { margin-bottom: 0; }
.bk-wordmark__notes { display: grid; border-top: 1px solid var(--line); }
.bk-wordmark__note { padding: .9rem 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: var(--fs-small); line-height: 1.5; }
.bk-wordmark__note b { display: block; color: var(--white); font-family: var(--f-head); font-size: 1.1rem; font-weight: 600; margin-bottom: .2rem; }
.bk-wordmark__note[data-wm-note="1"] b { color: var(--lg-neuro); }
.bk-wordmark__stage { position: relative; height: min(62vh, 620px); }
.bk-wordmark__neuro, .bk-wordmark__nutri, .bk-wordmark__sign { position: absolute; left: 0; }
.bk-wordmark__neuro { width: 66%; top: 4%; }
.bk-wordmark__nutri { width: 100%; top: 50%; }
.bk-wordmark__sign { width: 12%; top: 0; opacity: 0; }
@media (max-width: 1023px) {
  .bk-wordmark__pin { min-height: 0; padding-block: var(--sp-xl) var(--sp-l); }
  .bk-wordmark__grid { grid-template-columns: 1fr; }
  .bk-wordmark__stage { height: auto; display: grid; gap: 1rem; padding-top: var(--sp-m); }
  .bk-wordmark__neuro, .bk-wordmark__nutri { position: relative; top: auto; }
  .bk-wordmark__neuro { width: 70%; }
  .bk-wordmark__sign { display: none; }
}

/* ---------- 08 — Typografia ---------- */
.bk-type { padding-block: var(--sp-xl); }
.bk-type__head { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: var(--sp-l); align-items: end; padding-bottom: var(--sp-l); }
.bk-type__intro { color: var(--muted); font-size: var(--fs-lead); line-height: 1.5; max-width: 46ch; }
.bk-type__intro b { color: var(--white); font-weight: 600; }
.bk-specimens { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.bk-specimen { padding: var(--sp-m) var(--sp-m) var(--sp-m) 0; display: grid; gap: 1rem; }
.bk-specimen + .bk-specimen { padding-left: var(--sp-m); border-left: 1px solid var(--line); }
.bk-specimen__top { display: flex; justify-content: space-between; gap: 1rem; }
.bk-specimen__aa { font-size: clamp(7rem, 4rem + 14vw, 20rem); line-height: .8; letter-spacing: -0.018em; }
.bk-specimen--sg .bk-specimen__aa { font-family: var(--f-head); font-weight: 600; color: var(--lime); }
.bk-specimen--in .bk-specimen__aa { font-family: var(--f-body); font-weight: 300; }
.bk-specimen__set { font-size: clamp(.95rem, .85rem + .4vw, 1.3rem); line-height: 1.5; color: var(--muted); word-break: break-all; }
.bk-specimen--sg .bk-specimen__set { font-family: var(--f-head); }
.bk-hierarchy { display: grid; margin-top: var(--sp-l); }
.bk-hierarchy__row { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: var(--sp-m); align-items: baseline; padding-block: 1.2rem; border-bottom: 1px solid var(--line); }
.bk-hier--h1 { font-family: var(--f-head); font-weight: 700; font-size: clamp(2.2rem, 1rem + 5vw, 6rem); line-height: .9; letter-spacing: -0.006em; color: var(--lime); }
.bk-hier--h1 em { font-style: normal; color: var(--white); display: block; }
.bk-hier--h2 { font-family: var(--f-head); font-weight: 600; font-size: clamp(1.6rem, 1rem + 2vw, 3rem); letter-spacing: -0.006em; line-height: 1.05; }
.bk-hier--cap { font-family: var(--f-head); font-weight: 500; font-size: clamp(.85rem, .8rem + .3vw, 1.05rem); letter-spacing: .01em; color: var(--lime); }
.bk-hier--body { font-size: var(--fs-lead); line-height: 1.5; max-width: 52ch; color: var(--gray); }
.bk-hier--micro { font-size: var(--fs-small); font-weight: 500; color: var(--muted); letter-spacing: .02em; }
.bk-type__src { margin-top: 1rem; }
.bk-playground { margin: var(--sp-l) var(--pad-x) 0; padding: var(--sp-m); border: 1px solid var(--line); background: rgba(53,54,50,.25); }
.bk-playground__head { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem 1rem; margin-bottom: 1rem; }
.bk-playground__hint { font-size: var(--fs-small); color: var(--muted); }
.bk-playground__out {
  width: 100%; min-height: 1.4em; resize: vertical; background: transparent; border: 0; border-bottom: 1px solid var(--line);
  padding: .2em 0; font-family: var(--f-head); font-weight: 700; font-size: 96px; line-height: 1.02; letter-spacing: -0.009em;
  color: var(--lime); overflow-wrap: anywhere; overflow: hidden;
}
.bk-playground__out:focus-visible { outline: none; border-bottom-color: var(--lime); }
.bk-playground__controls { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: center; margin-top: 1.2rem; }
@media (max-width: 1023px) {
  .bk-type__head { grid-template-columns: 1fr; gap: var(--sp-m); }
  .bk-specimens { grid-template-columns: 1fr; }
  .bk-specimen + .bk-specimen { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .bk-hierarchy__row { grid-template-columns: 1fr; gap: .5rem; }
}
@media (max-width: 599px) { .bk-playground { padding: 1rem; } }

/* ---------- 09 — Kolor ---------- */
.bk-color { overflow: clip; }
.bk-color__pin { position: relative; overflow: hidden; min-height: 100vh; min-height: 100svh; display: grid; grid-template-rows: auto 1fr; padding-top: calc(var(--nav-h) + var(--sp-l)); }
.bk-color__head { position: relative; z-index: 1; }
.bk-color__panel { position: absolute; inset: 0; z-index: 2; display: grid; align-content: end; gap: var(--sp-m); padding: var(--nav-h) var(--pad-x) var(--sp-l); background: var(--lime); color: var(--ink); visibility: hidden; }
.bk-color__big { font-family: var(--f-body); font-feature-settings: "zero" 1; font-weight: 800; font-size: clamp(4rem, 1rem + 14vw, 17rem); letter-spacing: -0.018em; line-height: .78; }
.bk-color__big::before { content: "#"; font-weight: 300; opacity: .45; }
.bk-color__claim { max-width: 54ch; font-size: var(--fs-lead); line-height: 1.45; font-weight: 500; }
.bk-palette { position: relative; z-index: 3; display: flex; align-self: stretch; margin-top: var(--sp-l); min-height: 58vh; }
.bk-palette li { position: relative; min-width: 0; background: var(--c); color: var(--t); transform-origin: 50% 100%; }
.bk-palette li:last-child button { padding-right: 46px; }
.bk-palette li:nth-child(2) { box-shadow: inset 1px 0 0 var(--line), inset -1px 0 0 var(--line); }
.bk-palette button { position: absolute; inset: 0; display: grid; align-content: end; gap: .25rem; padding: 1.2rem clamp(.6rem, 1.2vw, 1.4rem); text-align: left; transition: padding .4s var(--ease-out); }
.bk-palette button:hover, .bk-palette button:focus-visible { padding-bottom: 1.8rem; }
.bk-palette button:focus-visible { outline: 2px solid var(--t); outline-offset: -6px; }
.bk-palette b { font-family: var(--f-head); font-weight: 600; font-size: clamp(.95rem, .8rem + .5vw, 1.4rem); letter-spacing: -0.003em; line-height: 1.1; }
.bk-palette span { font-family: var(--f-head); font-size: var(--fs-small); letter-spacing: .06em; opacity: .85; }
.bk-palette i { font-style: normal; font-size: var(--fs-micro); opacity: .78; line-height: 1.3; }
.bk-palette button::after { content: "Kopiuj"; position: absolute; top: 1.1rem; left: clamp(.6rem, 1.2vw, 1.4rem); font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .01em; opacity: 0; transition: opacity .3s; }
.bk-palette button:hover::after, .bk-palette button:focus-visible::after { opacity: .8; }
.bk-color__src { padding-block: 1.2rem 0; }
@media (min-width: 1024px) {
  .bk-color__pin { height: 100vh; height: 100svh; padding-top: calc(var(--nav-h) + var(--sp-m)); }
  .bk-palette { min-height: 0; margin-top: var(--sp-m); }
}
.bk-lab { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(280px, 1fr); gap: var(--sp-l); padding-block: var(--sp-l) var(--sp-xl); align-items: start; }
.bk-lab__preview { position: relative; display: grid; place-items: center; min-height: 420px; background: var(--bg); transition: background-color .5s var(--ease-out); box-shadow: inset 0 0 0 1px var(--line); }
.bk-lab__logo { width: min(76%, 520px); }
.bk-lab__logo .bk-lg-sign, .bk-lab__logo .bk-lg-neuro, .bk-lab__logo .bk-lg-nutri { transition: fill .5s var(--ease-out); }
.bk-lab__ratio { position: absolute; left: 1rem; right: 1rem; bottom: 1rem; display: flex; flex-wrap: wrap; gap: .4rem 1.4rem; font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .01em; color: var(--fg, var(--white)); }
.bk-lab__ratio b { font-weight: 600; }
.bk-lab__controls { display: grid; gap: 1.1rem; }
.bk-lab__chips, .bk-lab__variants { display: flex; flex-wrap: wrap; gap: .5rem; }
.bk-swatch { display: inline-flex; align-items: center; gap: .6rem; min-height: 42px; padding: .3rem .9rem .3rem .35rem; border: 1px solid var(--line-strong); border-radius: 99px; font-family: var(--f-head); font-size: var(--fs-small); }
.bk-swatch::before { content: ""; width: 30px; height: 30px; border-radius: 50%; background: var(--c); box-shadow: inset 0 0 0 1px rgba(248,248,248,.25); }
.bk-swatch[aria-checked="true"] { border-color: var(--lime); background: rgba(192,242,41,.08); }
.bk-vswatch { width: 44px; height: 44px; border-radius: 50%; background: var(--c); box-shadow: inset 0 0 0 1px rgba(255,255,255,.2); position: relative; }
.bk-vswatch[aria-checked="true"]::after { content: ""; position: absolute; inset: -5px; border-radius: 50%; border: 1px solid var(--white); }
.bk-lab__vlabel { margin-top: .6rem; }
@media (max-width: 1023px) {
  .bk-color__pin { min-height: 0; padding-top: var(--sp-xl); }
  .bk-color__panel { position: relative; visibility: visible; min-height: 70svh; margin-top: var(--sp-l); }
  .bk-palette { flex-direction: column; min-height: 0; margin-top: 0; }
  .bk-palette li { flex: none !important; min-height: 92px; }
  .bk-palette button { align-content: center; grid-template-columns: 1fr auto; padding-inline: var(--gutter); }
  .bk-palette i { grid-column: 1 / -1; }
  .bk-palette button::after { display: none; }
  .bk-lab { grid-template-columns: 1fr; gap: var(--sp-m); }
  .bk-lab__preview { min-height: 300px; }
}

/* ---------- 10 — System marki ---------- */
.bk-system { padding-top: var(--sp-xl); overflow: clip; }
.bk-system__head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: var(--sp-l); align-items: end; padding-bottom: var(--sp-l); }
.bk-system__intro { display: grid; gap: 1.2rem; }
.bk-system__rules { display: flex; flex-wrap: wrap; gap: .45rem; }
.bk-system__rules li { padding: .35rem .8rem; border: 1px solid var(--line-strong); font-family: var(--f-head); font-size: var(--fs-small); color: var(--gray); }
.bk-system__rules li:first-child { border-color: var(--lime); color: var(--lime); }
.bk-hscroll { position: relative; }
.bk-hscroll__track { display: flex; gap: clamp(16px, 2vw, 32px); padding: var(--nav-h) var(--pad-x) var(--sp-m); width: max-content; align-items: center; height: 100vh; height: 100svh; }
.bk-slab { position: relative; height: min(70vh, 760px); display: grid; grid-template-rows: minmax(0, 1fr) auto; gap: 1rem; }
.bk-slab img { height: 100%; width: auto; max-width: none; object-fit: cover; }
.bk-slab--cards img, .bk-slab--hand img { aspect-ratio: 3 / 2; }
.bk-slab--identity img, .bk-slab--web img { aspect-ratio: 16 / 10; }
.bk-slab--catalog img { aspect-ratio: 1132 / 1600; }
.bk-slab figcaption { display: grid; grid-template-columns: auto 1fr; column-gap: 1rem; max-width: 44ch; font-size: var(--fs-small); color: var(--muted); }
.bk-slab figcaption b { grid-column: 2; display: block; font-family: var(--f-head); font-size: 1.15rem; color: var(--white); font-weight: 600; }
.bk-slab figcaption { grid-template-rows: auto auto; }
.bk-slab__n { grid-row: 1 / span 2; font-family: var(--f-head); font-size: var(--fs-micro); color: var(--lime); letter-spacing: .12em; padding-top: .35rem; }
.bk-system__src { padding-bottom: var(--sp-xl); }
@media (max-width: 1023px) {
  .bk-system__head { grid-template-columns: 1fr; gap: var(--sp-m); }
  .bk-hscroll__track { width: auto; height: auto; flex-direction: column; align-items: stretch; padding-top: 0; gap: var(--sp-l); }
  .bk-slab { height: auto; }
  .bk-slab img { width: 100%; height: auto; }
  .bk-system__src { padding-top: 0; }
}

/* ---------- 11 — Opakowanie ---------- */
.bk-pack { overflow: clip; }
.bk-pack__pin { position: relative; min-height: 100vh; min-height: 100svh; display: grid; align-items: center; padding: var(--nav-h) 0 var(--sp-m); isolation: isolate; }
.bk-pack__bg { position: absolute; inset: 0; z-index: -1; background:
  radial-gradient(ellipse 50% 60% at 68% 52%, rgba(192,242,41,.16), transparent 70%),
  radial-gradient(ellipse 70% 50% at 70% 100%, rgba(255,255,255,.06), transparent 70%), var(--ink); }
.bk-pack__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: var(--sp-l); align-items: center; }
.bk-pack__text { display: grid; gap: var(--sp-m); }
.bk-pack__lead { color: var(--muted); font-size: var(--fs-lead); line-height: 1.5; max-width: 44ch; }
.bk-pack__lead b { color: var(--white); font-weight: 600; }
.bk-pack__details { display: grid; border-top: 1px solid var(--line); }
.bk-pack__details li { display: grid; grid-template-columns: 2.4rem 1fr; padding: .9rem 0; border-bottom: 1px solid var(--line); color: var(--muted); transition: color .4s; }
.bk-pack__details li span { font-family: var(--f-head); font-size: var(--fs-micro); color: var(--lime); letter-spacing: .1em; padding-top: .2rem; }
.bk-pack__details li.bk-is-active { color: var(--white); }
.bk-pack__stage { position: relative; justify-self: center; width: min(100%, 52vh); aspect-ratio: 892 / 1434; perspective: 1200px; }
.bk-pack__jar { width: 100%; height: 100%; object-fit: contain; filter: drop-shadow(0 40px 60px rgba(0,0,0,.55)); transform-origin: 50% 60%; }
.bk-pack__lens { position: absolute; width: 42%; aspect-ratio: 1; border-radius: 50%; background-image: url("img/jar-single.webp"); background-repeat: no-repeat; background-color: var(--ink); box-shadow: 0 0 0 1px var(--lime), 0 20px 50px rgba(0,0,0,.6); opacity: 0; transform: scale(.6); }
.bk-pack__lens--claim { left: -26%; top: 52%; background-size: 260% auto; background-position: 22% 56%; }
.bk-pack__lens--seal { right: -22%; top: 46%; background-size: 260% auto; background-position: 98% 58%; }
.bk-pack__lens--lid { right: -14%; top: -4%; background-size: 280% auto; background-position: 56% 3%; }
.bk-pack__src { position: absolute; left: var(--pad-x); bottom: 1.2rem; }
.bk-pack__light { background: var(--white); color: var(--ink); padding-block: var(--sp-xl); }
.bk-pack__light-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--sp-l); align-items: center; }
.bk-pack__light-grid img { width: min(100%, 520px); justify-self: center; filter: drop-shadow(0 30px 40px rgba(18,19,17,.25)); }
.bk-pack__light-grid > div { display: grid; gap: 1rem; max-width: 48ch; }
.bk-pack__light .bk-label, .bk-pack__light .bk-note { color: var(--muted-light); }
@media (max-width: 1023px) {
  .bk-pack__pin { min-height: 0; padding-block: var(--sp-xl) var(--sp-l); }
  .bk-pack__grid, .bk-pack__light-grid { grid-template-columns: 1fr; }
  .bk-pack__stage { width: min(62vw, 340px); margin-block: var(--sp-m); }
  .bk-pack__lens { opacity: 1; transform: none; width: 38%; }
  .bk-pack__lens--claim { left: -18%; }
  .bk-pack__lens--seal { right: -16%; }
  .bk-pack__lens--lid { right: -10%; }
  .bk-pack__src { position: relative; left: auto; bottom: auto; padding-inline: var(--pad-x); }
}

/* ---------- 12 — Pięć kroków ---------- */
.bk-steps { padding-block: var(--sp-xl); }
.bk-steps__head { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: var(--sp-l); align-items: end; padding-bottom: var(--sp-l); }
.bk-steps__intro { color: var(--muted); font-size: var(--fs-lead); line-height: 1.5; max-width: 46ch; }
.bk-entry { display: flex; flex-wrap: wrap; align-items: center; gap: .8rem 1.2rem; padding-bottom: var(--sp-m); }
.bk-entry__chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.bk-entry__out { width: 100%; font-size: var(--fs-small); color: var(--muted); }
.bk-entry__out b { color: var(--lime); font-weight: 600; }
.bk-path { padding: 2rem var(--pad-x) 0; }
.bk-path__inner { position: relative; }
.bk-path__line { position: absolute; left: 10%; top: 21px; width: 80%; height: 2px; overflow: visible; }
.bk-path__base { stroke: var(--line-strong); stroke-width: 2; vector-effect: non-scaling-stroke; }
.bk-path__fill { stroke: var(--lime); stroke-width: 2; vector-effect: non-scaling-stroke; filter: drop-shadow(0 0 6px rgba(192,242,41,.7)); }
.bk-path__nodes { position: relative; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); }
.bk-path__nodes button { width: 100%; display: grid; justify-items: center; gap: .55rem; padding: 0 .3rem 1.2rem; text-align: center; transition: opacity .4s; }
.bk-path__dot { position: relative; width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line-strong); background: var(--ink); transition: border-color .4s, box-shadow .4s, background-color .4s; }
.bk-path__dot::after { content: ""; position: absolute; inset: 15px; border-radius: 50%; background: var(--line-strong); transition: background-color .4s, inset .4s; }
.bk-path__n { font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .01em; color: var(--muted); }
.bk-path__t { font-family: var(--f-head); font-size: clamp(.95rem, .8rem + .6vw, 1.4rem); font-weight: 600; letter-spacing: -0.006em; line-height: 1.1; }
.bk-path__nodes li.bk-is-lit .bk-path__dot { border-color: var(--lime); }
.bk-path__nodes li.bk-is-lit .bk-path__dot::after { background: var(--lime); }
.bk-path__nodes button[aria-selected="true"] .bk-path__dot { box-shadow: 0 0 0 6px rgba(192,242,41,.12), 0 0 24px rgba(192,242,41,.45); border-color: var(--lime); }
.bk-path__nodes button[aria-selected="true"] .bk-path__dot::after { inset: 10px; background: var(--lime); }
.bk-path__nodes button[aria-selected="true"] .bk-path__t { color: var(--lime); }
.bk-path__nodes li.bk-is-skip button { opacity: .32; }
.bk-panels { padding-top: var(--sp-m); }
.bk-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--sp-l); align-items: center; padding-top: var(--sp-m); border-top: 1px solid var(--line); }
.bk-panel[hidden] { display: none; }
.bk-panel.bk-is-entering { animation: bk-fadeUp .6s var(--ease-out); }
.bk-panel__text { display: grid; gap: 1rem; max-width: 52ch; }
.bk-panel__text > p:not(.bk-panel__n) { color: var(--muted); font-size: var(--fs-lead); line-height: 1.5; }
.bk-panel__n { font-family: var(--f-head); font-size: var(--fs-micro); letter-spacing: .01em; color: var(--lime); }
.bk-panel .bk-h3 { font-size: clamp(2rem, 1.2rem + 2.6vw, 3.8rem); }
.bk-panel__list { display: grid; border-top: 1px solid var(--line); }
.bk-panel__list li { padding: .7rem 0 .7rem 1.6rem; border-bottom: 1px solid var(--line); position: relative; }
.bk-panel__list li::before { content: ""; position: absolute; left: 0; top: 1.25rem; width: 8px; height: 1px; background: var(--lime); }
.bk-panel__list--forms { grid-template-columns: 1fr 1fr; column-gap: 1.5rem; }
.bk-panel__fig { display: grid; gap: .6rem; justify-items: center; }
.bk-panel__fig img { width: min(100%, 420px); }
.bk-panel__fig--wide img { width: 100%; box-shadow: 0 0 0 1px var(--line); }
.bk-panel__fig figcaption { font-size: var(--fs-micro); color: var(--muted); }
@media (max-width: 1023px) {
  .bk-steps__head { grid-template-columns: 1fr; gap: var(--sp-m); }
  .bk-path { padding-inline: var(--gutter); }
  .bk-path__line { display: none; }
  .bk-path__nodes { grid-template-columns: 1fr; border-left: 2px solid var(--line-strong); margin-left: 21px; }
  .bk-path__nodes::before { content: ""; position: absolute; left: -2px; top: 0; width: 2px; height: var(--fill, 0%); background: var(--lime); }
  .bk-path__nodes button { grid-template-columns: 44px auto 1fr; justify-items: start; align-items: center; column-gap: 1rem; text-align: left; padding: .4rem 0 .4rem 0; margin-left: -23px; }
  .bk-panel { grid-template-columns: 1fr; gap: var(--sp-m); }
}
@media (max-width: 599px) { .bk-path__n { display: none; } .bk-path__nodes button { grid-template-columns: 44px 1fr; } }

/* ---------- 13 — Strona ---------- */
.bk-digital { padding-block: var(--sp-xl); }
.bk-digital__head { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: var(--sp-l); align-items: end; padding-bottom: var(--sp-l); }
.bk-digital__intro { color: var(--muted); font-size: var(--fs-lead); line-height: 1.5; max-width: 48ch; }
.bk-viewer__bar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .8rem; margin-bottom: 1.2rem; }
.bk-viewer__toggles { display: flex; flex-wrap: wrap; gap: .6rem; }
.bk-viewer__frame { margin-inline: auto; width: 100%; max-width: 1200px; background: #1b1c1a; box-shadow: 0 0 0 1px var(--line-strong), 0 40px 90px rgba(0,0,0,.5); transition: max-width .7s var(--ease-out), border-radius .7s var(--ease-out); overflow: hidden; }
.bk-viewer__frame[data-device="mobile"] { max-width: 390px; border-radius: 34px; padding: 10px; }
.bk-viewer__chrome { display: flex; align-items: center; gap: 6px; height: 36px; padding: 0 14px; border-bottom: 1px solid var(--line); }
.bk-viewer__chrome i { width: 10px; height: 10px; border-radius: 50%; background: var(--card); }
.bk-viewer__chrome span { margin-left: 1rem; padding: .15rem .8rem; border-radius: 99px; background: rgba(255,255,255,.05); font-size: var(--fs-micro); color: var(--muted); }
.bk-viewer__frame[data-device="mobile"] .bk-viewer__chrome { border-radius: 24px 24px 0 0; justify-content: center; }
.bk-viewer__frame[data-device="mobile"] .bk-viewer__chrome i { display: none; }
.bk-viewer__frame[data-device="mobile"] .bk-viewer__chrome span { margin: 0; }
.bk-viewer__screen { height: min(70vh, 720px); overflow-y: auto; overscroll-behavior: contain; scrollbar-width: thin; scrollbar-color: var(--lime) transparent; background: #000; }
.bk-viewer__frame[data-device="mobile"] .bk-viewer__screen { height: min(72vh, 720px); border-radius: 0 0 24px 24px; }
.bk-viewer__screen img { width: 100%; transition: opacity .35s; }
.bk-viewer__screen.bk-is-swapping img { opacity: 0; }
.bk-viewer__note { margin-top: 1rem; text-align: center; margin-inline: auto; }
.bk-devices { margin-top: var(--sp-xl); display: grid; gap: 1rem; }
.bk-devices img { width: 100%; }
@media (max-width: 1023px) {
  .bk-digital__head { grid-template-columns: 1fr; gap: var(--sp-m); }
  .bk-viewer__bar .bk-seg:first-child { width: 100%; }
}

/* ---------- 14 — Finał ---------- */
.bk-finale { position: relative; overflow: clip; isolation: isolate; }
.bk-finale__lines { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; opacity: .9; }
.bk-finale__lines path { fill: none; stroke: #262f10; }
.bk-finale__pin { position: relative; height: 100vh; height: 100svh; display: grid; place-items: center; }
.bk-finale__sign { position: absolute; width: min(46vh, 60vw); filter: drop-shadow(0 0 40px rgba(192,242,41,.22)); }
.bk-finale__logo { position: absolute; width: min(680px, 80vw); opacity: 0; }
.bk-finale__body { display: grid; gap: var(--sp-m); padding-bottom: var(--sp-xl); }
.bk-finale__title { max-width: 16ch; }
.bk-finale__text { max-width: 62ch; color: var(--gray); }
.bk-scope { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.bk-scope li { padding: 1.1rem 1rem 1.1rem 0; font-family: var(--f-head); font-weight: 600; font-size: clamp(1rem, .9rem + .4vw, 1.3rem); letter-spacing: -0.003em; }
.bk-scope li + li { padding-left: 1rem; border-left: 1px solid var(--line); }
.bk-scope span { display: block; font-size: var(--fs-micro); letter-spacing: .12em; color: var(--lime); font-weight: 500; margin-bottom: .4rem; }
.bk-finale__claim { margin-top: var(--sp-m); font-family: var(--f-head); font-size: clamp(1.6rem, 1rem + 2.6vw, 3.8rem); font-weight: 600; letter-spacing: -0.011em; line-height: 1.05; }
.bk-finale__claim em { font-style: normal; color: var(--lime); }
@media (max-width: 1023px) {
  .bk-finale__pin { height: auto; min-height: 0; padding: var(--sp-xl) var(--gutter) var(--sp-l); display: grid; gap: var(--sp-l); }
  .bk-finale__sign, .bk-finale__logo { position: relative; opacity: 1; }
  .bk-finale__sign { width: min(50vw, 260px); }
  .bk-scope { grid-template-columns: 1fr 1fr; }
  .bk-scope li + li { padding-left: 0; border-left: 0; }
  .bk-scope li { border-bottom: 1px solid var(--line); }
}

/* ---------- Tryb statyczny (bez GSAP / ograniczony ruch) ---------- */
html.bk-page.bk-reduced-motion .bk-color__panel, html.bk-page.bk-motion-failed .bk-color__panel { position: relative; visibility: visible; min-height: 60vh; margin-top: var(--sp-l); }
html.bk-page.bk-reduced-motion .bk-finale__logo, html.bk-page.bk-motion-failed .bk-finale__logo { position: relative; opacity: 1; }
html.bk-page.bk-reduced-motion .bk-finale__pin, html.bk-page.bk-motion-failed .bk-finale__pin { height: auto; padding-block: var(--sp-xl) var(--sp-l); gap: var(--sp-l); }
html.bk-page.bk-reduced-motion .bk-finale__sign, html.bk-page.bk-motion-failed .bk-finale__sign { position: relative; width: min(30vh, 50vw); }
html.bk-page.bk-reduced-motion .bk-pack__lens, html.bk-page.bk-motion-failed .bk-pack__lens { opacity: 1; transform: none; }
html.bk-page.bk-reduced-motion .bk-wordmark__sign, html.bk-page.bk-motion-failed .bk-wordmark__sign { display: none; }
html.bk-page.bk-reduced-motion .bk-hscroll__track, html.bk-page.bk-motion-failed .bk-hscroll__track { width: auto; height: auto; flex-wrap: wrap; padding-top: 0; }
html.bk-page.bk-reduced-motion .bk-slab, html.bk-page.bk-motion-failed .bk-slab { height: auto; width: min(100%, 720px); }
html.bk-page.bk-reduced-motion .bk-slab img, html.bk-page.bk-motion-failed .bk-slab img { width: 100%; height: auto; }
html.bk-page.bk-reduced-motion .bk-worlds__q, html.bk-page.bk-motion-failed .bk-worlds__q { background: rgba(10,11,10,.7); padding: 1rem; }
@media (min-width: 1024px) {
  html.bk-page.bk-reduced-motion .bk-color__pin, html.bk-page.bk-motion-failed .bk-color__pin { height: auto; overflow: visible; padding-bottom: var(--sp-m); }
  html.bk-page.bk-reduced-motion .bk-palette, html.bk-page.bk-motion-failed .bk-palette { min-height: 50vh; }
  html.bk-page.bk-reduced-motion .bk-hscroll__track, html.bk-page.bk-motion-failed .bk-hscroll__track { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-l) var(--sp-m); padding-inline: var(--pad-x); }
  html.bk-page.bk-reduced-motion .bk-slab, html.bk-page.bk-motion-failed .bk-slab { width: auto; }
}

/* ---------- Nagłówki rozdziałów: etykieta zawsze w osobnym wierszu nad tytułem ---------- */
.bk-worlds__head > .bk-eyebrow, .bk-scale__head > .bk-eyebrow, .bk-type__head > .bk-eyebrow, .bk-system__head > .bk-eyebrow, .bk-steps__head > .bk-eyebrow, .bk-digital__head > .bk-eyebrow { grid-column: 1 / -1; margin-bottom: 0; }

/* ---------- Niskie ekrany desktop (np. 1280×720, 1366×768): przypięte sceny muszą się zmieścić ---------- */
@media (min-width: 1024px) and (max-height: 860px) {
  .bk-idea .bk-h2, .bk-pack .bk-h2, .bk-wordmark .bk-h2, .bk-color .bk-h2 { font-size: clamp(2.1rem, 1rem + 3vw, 4.2rem); }
  .bk-idea__pin .bk-eyebrow, .bk-pack__pin .bk-eyebrow, .bk-wordmark__pin .bk-eyebrow, .bk-color__pin .bk-eyebrow { margin-bottom: 1rem; }
  .bk-idea__text, .bk-pack__text { gap: 1rem; }
  .bk-idea__steps li { padding-block: .55rem; }
  .bk-idea__steps li b { font-size: 1.05rem; }
  .bk-idea__stage { width: min(100%, 58vh); }
  .bk-pack__lead { font-size: 1.05rem; }
  .bk-pack__details li { padding-block: .5rem; font-size: .95rem; }
  .bk-pack__stage { width: min(100%, 46vh); }
  .bk-pack__src { bottom: .6rem; }
  .bk-wordmark__pin { padding-top: calc(var(--nav-h) + 1rem); }
  .bk-explorer__stage { min-height: 72vh; }
}

/* ==========================================================================
   WD Design — dopasowanie do strony (generator build-neuronutrition.cjs, 1.24.49)
   ========================================================================== */
.bk { position: relative; overflow-x: clip; }
/* Kroje strony klienta jako krzywe: szerokość w em (skaluje się z font-size), wysokość z proporcji. */
.bk-curve { display: block; height: auto; max-width: 100%; overflow: visible; }
.bk-specimen__aa .bk-curve { display: inline-block; vertical-align: top; }
.bk-hier__narrow { display: none; }
@media (max-width: 600px) {
  .bk-hier__wide { display: none; }
  .bk-hier__narrow { display: block; }
}
/* Nagłówki strony (Nohemi ma 400/500) — 500 zamiast 600–700 ze źródła, rozstaw jak w nagłówkach strony. */
.bk-h2, .bk-h3 { font-weight: 500; letter-spacing: -0.011em; }
/* Pole testowe: prawdziwe Space Grotesk i Inter (doładowywane), do tego czasu kroje strony. */
/* Pasek rozdziałów i menu: tuż pod DOLNĄ krawędzią nagłówka strony (--bar-top liczy skrypt — uwzględnia
   pasek administratora WordPressa). Pasek zostaje nad otwartym menu, „Rozdziały” zamienia się w „Zamknij”. */
.bk-site-header { inset: var(--bar-top, var(--site-offset)) 0 auto 0; }
.bk-menu { inset: calc(var(--bar-top, var(--site-offset)) + var(--header-h)) 0 0 0; }
.bk-menu__inner { padding-top: 1.1rem; }
.bk-menu-open .bk-site-header { z-index: 160; color: var(--white); }
.bk-menu-open .bk-site-header::before { opacity: 1; background: var(--black); border-bottom-color: var(--line); }
.bk-menu-btn__icon i { transition: transform .4s var(--ease-out); }
.bk-menu-btn[aria-expanded="true"] .bk-menu-btn__icon i:first-child { transform: translateY(2px) rotate(45deg); }
.bk-menu-btn[aria-expanded="true"] .bk-menu-btn__icon i:last-child { transform: translateY(-2px) rotate(-45deg); }
.bk-menu-btn[aria-expanded="true"]:hover .bk-menu-btn__icon { transform: none; }
/* Silnik ruchu motywu dzieli h2 na słowa — tu robi to skrypt case study. */
.bk h2 .sm-w { display: inline; }
/* Reguły motywu dla H1 stron (H1 35 px na telefonie) nie dotyczą okładki księgi. */
@media (max-width: 720px) {
  main .bk h1.bk-hero__title { font-size: var(--fs-hero) !important; line-height: .95 !important; }
}
/* Nohemi ma w motywie tylko 400/500 — bez sztucznego pogrubiania (litery zlewały się w hero). */
.bk { font-synthesis-weight: none; }
/* Finał: dwa przyciski (realizacje i wycena). */
.bk-finale__actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: var(--sp-m); }
.bk-cta { display: inline-flex; align-items: center; gap: .6rem; min-height: 48px; padding: 0 1.4rem; border-radius: 99px; background: var(--lime); color: var(--ink); font-weight: 600; font-size: var(--fs-small); text-decoration: none; transition: background-color .3s, color .3s, box-shadow .3s; }
.bk-cta:hover { background: var(--white); }
.bk-cta--ghost { background: transparent; color: var(--white); box-shadow: inset 0 0 0 1px var(--line-strong); }
.bk-cta--ghost:hover { background: transparent; color: var(--lime); box-shadow: inset 0 0 0 1px var(--lime); }