.pg-idwhy {
  background-color: #fff;
  padding: 104px 0;
}

.pg-idwhy__inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 80px;
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 88px;
  align-items: start;
}

/* --- left masthead --- */
.pg-idwhy__head {
  position: sticky;
  top: 100px;
}

.pg-idwhy__kicker {
  font-family: "Cabin", sans-serif;
  font-weight: 600;
  font-size: 13px;
  line-height: 16px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: linear-gradient(90deg, #0036fa, #4e87fc);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.pg-idwhy__title {
  font-family: "Cabin", sans-serif;
  font-weight: 700;
  font-size: 40px;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: #12140f;
  margin-top: 20px;
  max-width: 420px;
}

/* --- right: numbered argument spine --- */
.pg-idwhy__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 40px;
  padding-left: 62px;
}

/* the spine */
.pg-idwhy__list::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, #0036fa, #4e87fc);
  opacity: 0.28;
}

.pg-idwhy__item {
  position: relative;
}

.pg-idwhy__num {
  position: absolute;
  left: -62px;
  top: -2px;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  background-image: linear-gradient(135deg, #0036fa, #4e87fc);
  box-shadow: 0 8px 18px rgba(0, 54, 250, 0.22);
}

.pg-idwhy__p {
  font-family: "Cabin", sans-serif;
  font-weight: 400;
  font-size: 17px;
  line-height: 28px;
  color: #4d4d4d;
}

.pg-idwhy__hl {
  color: #0036fa;
  font-weight: 600;
}

/* --- scroll-reveal (site motion language) --- */
.pg-idwhy__head,
.pg-idwhy__item {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.pg-idwhy__head.is-in,
.pg-idwhy__item.is-in {
  opacity: 1;
  transform: none;
}

.pg-idwhy__item.is-in:nth-child(1) { transition-delay: 0.06s; }
.pg-idwhy__item.is-in:nth-child(2) { transition-delay: 0.16s; }
.pg-idwhy__item.is-in:nth-child(3) { transition-delay: 0.26s; }

@media (prefers-reduced-motion: reduce) {
  .pg-idwhy__head,
  .pg-idwhy__item {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* --- responsive --- */
@media (max-width: 1040px) {
  .pg-idwhy {
    padding: 80px 0;
  }
  .pg-idwhy__inner {
    grid-template-columns: 1fr;
    gap: 44px;
    padding: 0 24px;
  }
  .pg-idwhy__head {
    position: static;
  }
  .pg-idwhy__title {
    font-size: 32px;
    max-width: none;
  }
}

@media (max-width: 600px) {
  .pg-idwhy__title {
    font-size: 28px;
  }
  .pg-idwhy__list {
    padding-left: 50px;
    gap: 32px;
  }
  .pg-idwhy__list::before {
    left: 15px;
  }
  .pg-idwhy__num {
    left: -50px;
    width: 32px;
    height: 32px;
  }
  .pg-idwhy__p {
    font-size: 16px;
    line-height: 27px;
  }
}