/* ===== 3D Walkthrough ===== */
#section-4 .walkthrough-wrapper  {
  width: 100%;
  padding: 60px 0;
  background: var(--secondary-col);
}

.walkthrough-wrapper .sec4a-header {
  text-align: center;
  margin-bottom: 40px;
}

.walkthrough-wrapper .sec4a-title {
  font-family: var(--font1);
  font-size: 48px;
  color: var(--tertiary-col);
  margin-bottom: 10px;
  position: relative;
  text-transform: uppercase;
  letter-spacing: 4px;
}

.walkthrough-wrapper .sec4a-title::before {
  content: "";
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 42px;
  height: 3px;
  background: var(--primary-col);
  border-radius: 10px;
}

.walkthrough-wrapper .sec4a-subtitle {
  font-family: var(--font3);
  font-size: 15px;
  color: #7d93a0;
}

.walkthrough-wrapper .sec4a-cards-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 25px;
  width: 95%;
  margin: auto;
}

.walkthrough-wrapper .walkthrough-card {
  background: var(--tertiary-col);
  border-radius: 18px;
  overflow: hidden;
  padding: 14px;
  transition: 0.3s ease;
  border-top: 3px solid var(--primary-col);
}

.walkthrough-wrapper .walkthrough-card:hover {
  transform: translateY(-5px);
}

.walkthrough-wrapper .walkthrough-btn {
  text-decoration: none;
  display: block;
}

.walkthrough-wrapper .card-video {
  width: 100%;
  height: 380px;
  overflow: hidden;
  border-radius: 14px;
}

.walkthrough-wrapper .card-video iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
  pointer-events: auto;
}

.walkthrough-wrapper .card-header {
  text-align: center;
  padding: 20px 10px 12px;
}

.walkthrough-wrapper .unit-type {
  font-family: var(--font1);
  color: var(--secondary-col);
  font-size: 34px;
  margin-bottom: 12px;
}

.walkthrough-wrapper .unit-badge {
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--secondary-col);
  background: transparent;
  padding: 8px 18px;
  border-radius: 4px;
  font-size: 13px;
  letter-spacing: 2px;
  display: inline-block;
  font-family: var(--font3);
  cursor: pointer;
  outline: none;
  box-shadow: none;
}

@media (max-width: 1200px) {

  .walkthrough-wrapper {
    padding: 60px 30px;
  }

  .walkthrough-wrapper .sec4a-cards-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    width: 100%;
  }

  .walkthrough-wrapper .card-video {
    height: 340px;
  }

  .walkthrough-wrapper .sec4a-title {
    font-size: 42px;
  }

  .walkthrough-wrapper .unit-type {
    font-size: 30px;
  }
}

/* ===== Tablet ===== */
@media (max-width: 900px) {

  .walkthrough-wrapper {
    padding: 50px 20px;
  }

  .walkthrough-wrapper .sec4a-cards-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
    width: 100%;
  }

  .walkthrough-wrapper .walkthrough-card {
    padding: 12px;
    border-radius: 16px;
  }

  .walkthrough-wrapper .card-video {
    height: 250px;
    border-radius: 12px;
  }

  .walkthrough-wrapper .sec4a-title {
    font-size: 36px;
    letter-spacing: 3px;
  }

  .walkthrough-wrapper .sec4a-subtitle {
    font-size: 14px;
  }

  .walkthrough-wrapper .unit-type {
    font-size: 26px;
  }

  .walkthrough-wrapper .unit-badge {
    font-size: 12px;
    padding: 9px 18px;
  }
}

@media (max-width: 767px) {

  .walkthrough-wrapper {
    padding: 45px 18px;
  }

  .walkthrough-wrapper .sec4a-cards-container {
    grid-template-columns: 1fr;
    gap: 22px;
    width: 100%;
  }

  .walkthrough-wrapper .walkthrough-card {
    padding: 10px;
    border-radius: 14px;
  }

  .walkthrough-wrapper .card-video {
    height: 250px;
    border-radius: 10px;
  }

  .walkthrough-wrapper .sec4a-title {
    font-size: 30px;
    letter-spacing: 2px;
  }

  .walkthrough-wrapper .sec4a-subtitle {
    font-size: 13px;
  }

  .walkthrough-wrapper .unit-type {
    font-size: 24px;
    margin-bottom: 10px;
  }

  .walkthrough-wrapper .unit-badge {
    font-size: 12px;
    padding: 10px 18px;
    min-width: 180px;
  }
}

@media (max-width: 520px) {

  .walkthrough-wrapper {
    padding: 40px 15px;
  }

  .walkthrough-wrapper .card-video {
    height: 220px;
  }

  .walkthrough-wrapper .sec4a-title {
    font-size: 26px;
  }

  .walkthrough-wrapper .unit-type {
    font-size: 22px;
  }

  .walkthrough-wrapper .unit-badge {
    width: 100%;
    max-width: 220px;
    text-align: center;
    font-size: 11px;
    padding: 10px 15px;
  }
}

@media (max-width: 375px) {

  .walkthrough-wrapper {
    padding: 35px 12px;
  }

  .walkthrough-wrapper .card-video {
    height: 190px;
  }

  .walkthrough-wrapper .sec4a-title {
    font-size: 22px;
  }

  .walkthrough-wrapper .sec4a-subtitle {
    font-size: 12px;
  }

  .walkthrough-wrapper .unit-type {
    font-size: 20px;
  }

  .walkthrough-wrapper .unit-badge {
    font-size: 10px;
    padding: 8px 12px;
  }
}