/* ==========================================================================
   STACK SECTION - "Built for Drivers. Designed for Fleet Managers."
   Dve kartice, na scroll se okrecu (flip) i otkrivaju listu benefita.
   Pozadina #242424 (nastavlja se iz features sekcije).
   ========================================================================== */

.stack-section {
  display: flex;
  flex-direction: column;
  align-items: center;

  padding: 100px 48px;
  background: #242424;
}

.stack-section__inner {
  width: 100%;
  max-width: var(--container-width);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stack-section__eyebrow {
  margin: 0;
  color: var(--main-blue);
  text-align: center;
  font-family: var(--font-family);
  font-size: 14px;
  font-style: normal;
  font-weight: 700;
  line-height: 21px; /* 150% */
  letter-spacing: 1.68px;
  text-transform: uppercase;
}

.stack-section__heading {
  margin: 16px 0 0;
  max-width: 554px;
  color: #FFF;
  text-align: center;
  font-family: var(--font-family);
  font-size: 40px;
  font-style: normal;
  font-weight: 700;
  line-height: 46px; /* 115% */
  letter-spacing: -0.8px;
}

/* Pin wrap - drzi visinu tokom scroll animacije flip-a */
.stack-pin-wrap {
  position: relative;
  width: 100%;
  height: 160vh;
  margin-top: 48px;
}

.stack-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.stack-wrap {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1800px;
}

.stack-card {
  width: 340px;
  height: 420px;
  min-height: 420px;
  position: relative;
}

.stack-card--left {
  margin-right: -24px;
  z-index: 1;
  transform: rotate(-8deg);
  transition: transform 1.1s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.stack-card--right {
  margin-left: -24px;
  z-index: 2;
  transform: rotate(8deg);
  transition: transform 1.1s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Kad je kartica potpuno okrenuta (JS dodaje is-flipped kad je flip ugao
   >= 90deg), ponisti staticni spoljasnji tilt (-8deg/8deg) - u suprotnom
   se sabira sa unutrasnjim .stack-card-inner tiltom (koji JS vec svodi
   na 0deg pri kraju flip-a) i kartica ostaje vidno iskosena dok se cita
   tekst na pozadini. */
.stack-card--left.is-flipped {
  transform: rotate(0deg);
}

.stack-card--right.is-flipped {
  transform: rotate(0deg);
}

.stack-card-inner {
  width: 100%;
  height: 100%;
  min-height: 420px;
  position: relative;
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 1.1s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.stack-face {
  position: absolute;
  top: 0;
  left: 0;
  width: 339.999px;
  height: 419.997px;
  display: flex;
  flex-direction: column;
  padding: 48px 40px;
  justify-content: center;
  align-items: center;
  border-radius: 24px;
  border: 1px solid #5A5A5A;
  box-shadow: 0 30px 60px 0 rgba(0, 0, 0, 0.45);
  backface-visibility: hidden;
  box-sizing: border-box;
}

.stack-face-back {
  transform: rotateY(180deg);
  justify-content: center;
  align-items: flex-start;
  text-align: left;
}

/* LEFT card colors */
.stack-card--left .stack-face {
  background: linear-gradient(164deg, #3D3D3D 0%, #262626 100%);
}

/* RIGHT card colors */
.stack-card--right .stack-face {
  background: linear-gradient(164deg, #5B8AE1 0%, #284887 100%);
}

/* Front titles */
.stack-card--left .stack-face-front h3 {
  margin: 0;
  color: #FFF;
  text-align: center;
  font-family: var(--font-family);
  font-size: 32px;
  font-style: normal;
  font-weight: 700;
  line-height: 48px; /* 150% */
  letter-spacing: -0.64px;
}

.stack-card--right .stack-face-front h3 {
  margin: 0;
  max-width: 340px;
  color: #FFF;
  text-align: center;
  font-family: var(--font-family);
  font-size: 32px;
  font-style: normal;
  font-weight: 700;
  line-height: 40px; /* 125% */
  letter-spacing: -0.64px;
}

/* Back titles */
.stack-face-back h3 {
  margin: 0 0 16px 0;
  color: #FFF;
  font-family: var(--font-family);
  font-size: 24px;
  font-style: normal;
  font-weight: 700;
  line-height: 36px; /* 150% */
  letter-spacing: -0.48px;
}

.stack-face-back ul {
  list-style: none;
  margin: 0;
  padding: 0;
  width: 100%;
  text-align: left;
}

.stack-face-back li {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.stack-face-back li::before {
  content: "\2713";
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  color: var(--main-blue);
  font-family: var(--font-family);
  font-size: 16px;
  font-style: normal;
  font-weight: 700;
  line-height: 24px; /* 150% */
}

.stack-face-back li span {
  color: #C4C4C4;
  font-family: var(--font-family);
  font-size: 16px;
  font-style: normal;
  font-weight: 400;
  line-height: 24px; /* 150% */
}

/* Right card back: checkbox + text u belom, bold checkbox / medium tekst,
   veci line-height (32px/200%), centrirano u odnosu jedno na drugo */
.stack-card--right .stack-face-back li::before {
  color: #FFF;
  font-weight: 700;
  line-height: 32px; /* 200% */
  letter-spacing: -0.64px;
}

.stack-card--right .stack-face-back li span {
  color: #FFF;
  font-weight: 500;
  line-height: 32px;
  letter-spacing: -0.64px;
}

/* ==========================================================================
   TABLET (768px - 1023px)
   ========================================================================== */
@media (max-width: 1023px) {

  .stack-section {
    padding: 80px 24px;
  }
}

/* ==========================================================================
   MOBILE (<= 767px)
   Kartice se stackuju vertikalno, flip animacija se i dalje pokrece na scroll
   (ista logika, samo je layout kolona umesto rotiranih kartica jedna preko
   druge). Gap izmedju kartica na mobile je 40px.
   ========================================================================== */
@media (max-width: 767px) {

  .stack-section {
    padding: 80px 24px;
  }

  /* !important na skoro sve - reseno isto kao u referentnom dizajnu:
     CSS !important pravila u stylesheet-u pobedjuju obican (bez !important)
     inline style koji JS postavlja preko style.transform, tako da JS ne
     mora da "brise" inline stil - CSS ovde uvek preuzima kontrolu na
     mobile-u, bez obzira sta desktop scroll-flip logika upisala. */

  .stack-pin-wrap {
    height: auto !important;
  }

  .stack-sticky {
    position: relative !important;
    top: auto !important;
    height: auto !important;
    overflow: visible !important;
    padding: 48px 0 !important;
  }

  .stack-wrap {
    width: 100%;
    flex-direction: column;
    min-height: auto;
    gap: 40px;
    perspective: 1800px;
    justify-content: center;
  }

  .stack-card--left,
  .stack-card--right {
    margin: 0 auto !important;
    width: 100%;
    max-width: 390px;
  }

  .stack-card {
    height: 300px !important;
    min-height: 300px !important;
    max-height: 300px !important;
    min-width: 300px;
  }

  .stack-card-inner {
    height: 300px !important;
    min-height: 300px !important;
    max-height: 300px !important;
    box-sizing: border-box;
    transition: transform 1.1s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
  }

  .stack-card--left,
  .stack-card--right {
    transform: none !important;
  }

  .stack-card--left .stack-card-inner {
    transform: translateX(0) rotate(-8deg) rotateY(0deg) !important;
  }

  .stack-card--right .stack-card-inner {
    transform: translateX(0) rotate(8deg) rotateY(0deg) !important;
  }

  .stack-card--left.is-flipped .stack-card-inner,
  .stack-card--right.is-flipped .stack-card-inner {
    transform: translateX(0) rotate(0deg) rotateY(180deg) !important;
  }

  .stack-face {
    width: 100%;
    height: 300px !important;
    padding: 24px 32px !important;
    box-sizing: border-box;
    justify-content: center !important;
  }

  .stack-face-front {
    align-items: center !important;
    text-align: center !important;
    justify-content: center !important;
  }

  .stack-face-back {
    align-items: flex-start !important;
    text-align: left !important;
  }

  .stack-face-back ul {
    text-align: left;
    width: 100%;
    list-style: none;
    padding: 0;
  }

  .stack-face-back li {
    font-size: 15px;
    margin-bottom: 6px;
  }

  .stack-face-back h3 {
    font-size: 24px;
    margin-bottom: 16px;
  }
}