/* =====================================================================
   CASE STUDY (podstrony Product Design: /pages/product-design/*.html)
   Motyw jasny (białe tło, czarny tekst). Font: aktiv-grotesk.
   Struktura: HERO (marquee + obraz + gwiazdki) -> sekcje treści:
   OVERVIEW (3 kolumny ikona+tekst), PROCESS/RESULTS/OUTCOME
   (2 kolumny: tekst + obraz). Animacje: marquee + reveal on scroll.
   ===================================================================== */

.case-study {
  background: var(--c-white);
  color: var(--c-ink);
  min-height: 100vh;
  padding-top: var(--header-h);
}

/* wspólny kontener treści */
.cs-container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- HERO ---------- */
.cs-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 56px) var(--gutter) clamp(28px, 4vw, 48px);
  text-align: center;
}
.cs-hero__stage {
  position: relative;
  max-width: 760px;
  margin-inline: auto;
}
/* przewijany napis PLANT CARE — za obrazem (obraz PNG jest wycięty) */
.cs-marquee {
  position: absolute;
  top: 48%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100vw;
  overflow: hidden;
  white-space: nowrap;
  z-index: 1;
  pointer-events: none;
  user-select: none;
}
.cs-marquee__track {
  display: inline-block;
  white-space: nowrap;
  animation: cs-marquee-scroll 26s linear infinite;
  will-change: transform;
}
.cs-marquee__track span {
  display: inline-block;
  font-size: clamp(2.4rem, 6vw, 3.98rem);   /* ~63.7px jak w oryginale */
  font-weight: 400;
  line-height: 1.4;
  padding-right: 0.5em;
  color: var(--c-ink);
}
@keyframes cs-marquee-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

.cs-hero__img {
  position: relative;
  z-index: 2;
  display: block;
  width: 100%;
  height: auto;               /* zapobiega zniekształceniu (atrybut height w <img>) */
  max-width: 722px;
  margin-inline: auto;
}

/* dekoracyjne gwiazdki */
.cs-star {
  position: absolute;
  z-index: 3;
  pointer-events: none;
}
.cs-star--1 { top: 12%;  right: 6%;  width: 60px; }   /* Star 3 top-right */
.cs-star--2 { top: 26%;  left: 4%;   width: 40px; }   /* Star 4 upper-left */
.cs-star--3 { top: 62%;  left: 3%;   width: 60px; }   /* Star 3 mid-left */
.cs-star--4 { top: 80%;  left: 14%;  width: 40px; }   /* Star 4 lower-left */

.cs-hero__title {
  position: relative;
  z-index: 2;
  margin-top: clamp(20px, 3vw, 36px);
  font-size: clamp(2rem, 3.6vw, 2.79rem);   /* ~44.6px */
  font-weight: 700;
  line-height: 1.15;
  text-align: center;
}
.cs-hero__date {
  position: relative;
  z-index: 2;
  margin-top: 10px;
  font-size: var(--fs-h4);   /* ~22px */
  font-weight: 700;
  text-align: center;
}

/* ---------- SEKCJE TREŚCI ---------- */
.cs-section {
  padding: clamp(40px, 7vw, 88px) 0;
}
.cs-label {
  font-size: var(--fs-h4);   /* ~22px */
  font-weight: 700;
  margin-bottom: clamp(24px, 3vw, 40px);
}

/* tekst */
.cs-text > * + * { margin-top: 1.1em; }
.cs-text p,
.cs-text li {
  font-size: 1.1rem;         /* ~17.6px */
  line-height: 1.7;
}
.cs-subhead {
  font-size: 1.1rem;
  line-height: 1.7;
  /* Tytuły pod-sekcji OVERVIEW (Problem statement / Context / My role) — pogrubione. */
  font-weight: 700;
}
.cs-text ul {
  margin: 0.4em 0 0;
  padding-left: 1.15em;
}
.cs-text li { margin-top: 0.35em; }

/* OVERVIEW — 3 kolumny: ikona + podtytuł + tekst */
.cs-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}
.cs-col__icon {
  width: 94px;
  height: 94px;
  margin-bottom: clamp(16px, 2vw, 28px);
}

/* PROCESS / RESULTS / OUTCOME — 2 kolumny: tekst + obraz */
.cs-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}
.cs-split__media { width: 100%; }
.cs-split__media img {
  width: 100%;
  height: auto;
  display: block;
}

/* blok wideo (miniatura + przycisk play) */
.cs-video {
  position: relative;
  max-width: 560px;
  margin: clamp(32px, 4vw, 56px) auto 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #000;
}
.cs-video img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.cs-video__play {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.55);
  display: grid;
  place-items: center;
  transition: background 0.15s linear, transform 0.15s ease;
}
.cs-video__play::before {
  content: "";
  width: 0; height: 0;
  border-style: solid;
  border-width: 12px 0 12px 20px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.cs-video:hover .cs-video__play {
  background: rgba(0, 0, 0, 0.75);
  transform: scale(1.05);
}
.cs-video__note {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 8px 12px;
  font-size: 0.8rem;
  text-align: center;
  color: #fff;
  background: rgba(0, 0, 0, 0.45);
}

/* ---------- ANIMACJE (reveal on scroll) ---------- */
.cs-reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.cs-reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .cs-marquee__track { animation: none; }
  .cs-reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- RESPONSYWNOŚĆ ---------- */
@media (max-width: 900px) {
  .cs-cols { grid-template-columns: 1fr; gap: clamp(28px, 6vw, 44px); }
  .cs-split { grid-template-columns: 1fr; }
  .cs-split__media { order: -1; }              /* obraz nad tekstem na mobile */
}
@media (max-width: 480px) {
  .cs-star { display: none; }
}