/* SEKCE 4 */
.sekce-4 {
  background-color: #ffffff;
}
.sekce-4-item {
  margin-bottom: 20px;
  border-radius: 10px;
  overflow: hidden;
  text-align: center;
  position: relative;
  text-decoration: none;
  display: block;
}

.sekce-4-item .content {
  position: relative;
}
.sekce-4-item .content h2 {
  font-size: 36px;
  line-height: 70px;
  font-weight: 800;
  margin-bottom: 30px;
  color: var(--color-text-primary);
  text-transform: uppercase;
}

.sekce-4-item .content p {
  color: var(--color-text-secondary);
  font-size: 18px;
  line-height: 35px;
  margin-bottom: 30px;
}

.sekce-4-item .content .label {
  font-size: 14px;
  font-weight: 600;
  line-height: 35px;
  color: var(--color-primary);
}

.sekce-4-item .content span {
  font-size: 18px;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 700;
}

.sekce-4-item .flip-card-back.dark .content span {
  color: var(--color-tertiary);
}

.sekce-4-item .flip-card-back.dark .content p {
  color: white;
  font-size: 18px;
  line-height: 30px;
}

.sekce-4-item .flip-card-back.dark .content .content-label {
  color: var(--color-tertiary);
}

.sekce-4-item.flip-card {
  overflow: visible;  /* přepíše overflow: hidden pro flip karty */
}

.flip-card-front, .flip-card-back {
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

.sekce-4-item:hover .content span {
  color: #000000;
}

/* SEKCE 4-A */
.sekce-4-A .sekce-4-item {
  padding: 60px 180px;
}

/* SEKCE 4-C */
.sekce-4-C .sekce-4-item {
  padding: 60px 25px;
}
.sekce-4-C .sekce-4-item .content h3 {
  font-size: 20px;
  line-height: 30px;
  margin-bottom: 25px;
}
.sekce-4.sekce-4-C {
  background-color: var(--color-background);
  padding-top: 80px;
  padding-bottom: 120px;
}
.sekce-4.sekce-4-C .label {
  font-size: 14px;
  line-height: 35px;
  font-weight: 600;
  color: var(--color-primary);
}
.sekce-4.sekce-4-C h2 {
  font-size: 36px;
  line-height: 70px;
  font-weight: 800;
  margin-bottom: 30px;
  text-transform: uppercase;
  color: var(--color-text-primary);
}
.sekce-4.sekce-4-C .content p {
  color: var(--color-text-tertiary);
  font-size: 16px;
  line-height: 35px;
}
.sekce-4.sekce-4-C .content .content-label {
  font-size: 18px;
  font-weight: 600;
  line-height: 35px;
  height: 70px;
  color: #333333;
}
.sekce-4.sekce-4-C .content span {
  font-weight: normal;
  font-size: 14px;
  line-height: 35px;
  color: var(--color-primary);
}
.sekce-4-C .row {
  margin-left: -10px;
  margin-right: -10px;
}
.sekce-4-C .col-lg-6,
.sekce-4-C .col-xl-4,
.sekce-4-C .col-xl-3 {
  padding: 0 10px;
}

/* SPOLEČNÉ VLASTNOSTI KARET (.box) */
.sekce-4-item.box {
  position: relative;
  aspect-ratio: 1/1;
  border-radius: 0;
  text-decoration: none;
}

.sekce-4-item.box .inner-box {
  position: absolute;
  border: 2px solid var(--color-background);
  inset: 10px;
  pointer-events: none;
}

.sekce-4-item.box .content-img {
  margin-top: auto;
  margin-bottom: auto;
  max-width: 50%;
}

.sekce-4-item.box .content p {
  margin-top: auto;
  margin-bottom: auto;
}

/* --- FLIP CARD MECHANISMUS (3D otočení) --- */
.sekce-4-item.box.flip-card {
  background-color: transparent; 
  box-shadow: none;              
  padding: 0;                    
  perspective: 1000px;           
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.8s cubic-bezier(0.4, 0.2, 0.2, 1); 
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

/* Modré kruhové pozadí za ikonami v kartách */
.sekce-4-item.box .content-img {
  background-color: var(--color-primary);
  border-radius: 50%;
  width: 130px !important;
  height: 130px !important;
  max-width: 130px !important;
  display: flex !important;
  align-items: center;
  justify-content: center;
  padding: 25px;
  box-sizing: border-box;
}

.sekce-4-item.box .content-img img {
  filter: brightness(0) invert(1);
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* Otočení při najetí myší (pouze pro zařízení s myší) */
@media (hover: hover) {
  .sekce-4-item.box.flip-card:hover .flip-card-inner {
    -webkit-transform: rotateY(180deg);
    transform: rotateY(180deg);
    
  }
}

.flip-card-front {
  background-color: #ffffff;
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;         
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  
  /* OPRAVA PRO FIREFOX */
  -webkit-transform: rotateY(0deg) translateZ(1px);
  transform: rotateY(0deg) translateZ(1px);
  z-index: 2;
}
 
.flip-card-back {
  background-color: #333333;
  color: white;
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;         
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  
  /* OPRAVA PRO FIREFOX */
  -webkit-transform: rotateY(180deg) translateZ(-1px);  
  transform: rotateY(180deg) translateZ(-1px);
  z-index: 1;
}

.flip-card-back .inner-box {
  border-color: var(--color-text-tertiary);
}

.flip-card-back.dark .content .content-label {
  color: white;
}

/* Zajištění růstu obsahu pro obě strany */
.flip-card-front .content,
.flip-card-back .content {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  flex-grow: 1;
  position: relative;
  z-index: 2;
}

/* RESPONZIVITA */
@media (max-width: 991px) {
  .sekce-4 .container-fluid {
    padding: 0 20px;
  }
  .sekce-4-A .sekce-4-item {
    padding: 60px 40px;
  }

  .sekce-4.sekce-4-A h2,
  .sekce-4.sekce-4-C h2 {
    font-size: 30px;
    line-height: 40px;
  }

  .sekce-4.sekce-4-C .flip-card-back.dark .content p {
    font-size: 14px;
    line-height: 30px;
  }

}
/* END SEKCE 4 */