/* =========================================================
   Dark 4-card process section
   Hover: white fill from top → bottom + slight tilt
   ========================================================= */

:root {
  --card-border: rgba(255, 255, 255, 0.06);
  --text: #ffffff;
  --text-muted: rgba(255, 255, 255, 0.45);

  --radius: 18px;
}

.sk-section {
  width: 100%;

  background: var(--sk-color-primary-dark);
  color: var(--text);
  font-family: var(--sk-font-heading);
  -webkit-font-smoothing: antialiased;
}

/* ---------- Header ---------- */
.sk-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 3.25rem;
}

.sk-header__title {
  font-size: clamp(2.1rem, 4.5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.08;
  max-width: 12ch;
  color: var(--sk-color-bg-warm);
}

.sk-header__right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1.1rem;
  padding-top: 0.35rem;
}

.sk-header__sub {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
  text-align: right;
  max-width: 22ch;
}

/* ---------- Cards grid ---------- */
.sk-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.sk-card {
  position: relative;
  background: #2a303f;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 1.75rem 1.4rem 1.6rem;
  min-height: 280px;
  overflow: hidden;
  cursor: pointer;
  transition:
    transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 0.45s ease;
}

/* White fill that grows from top → bottom */
.sk-card__fill {
  position: absolute;
  inset: 0;
  background: #fff;
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
  z-index: 0;
  border-radius: inherit;
}

.sk-card:hover .sk-card__fill {
  transform: scaleY(1);
}

/* Content sits above the fill */
.sk-card__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: color 0.4s ease;
}

.sk-card:hover .sk-card__inner {
  color: #111;
}

.sk-card:hover .sk-card__desc {
  color: rgba(0, 0, 0, 0.55);
}

.sk-card:hover .sk-card__num {
  color: rgba(0, 0, 0, 0.35);
}

/* Number */
.sk-card__num {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.35);
  margin-bottom: 1.5rem;
  transition: color 0.4s ease;
}

/* Icon */
.sk-card__icon {
  width: 28px;
  height: 28px;
  margin-bottom: 1.35rem;
  color: currentColor;
  opacity: 0.9;
}

.sk-card__icon svg {
  width: 100%;
  height: 100%;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.6;
}

.sk-card__title {
  font-size: 1.25rem;
  font-weight: 650;
  color: var(--sk-color-bg-warm);

  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 0.7rem;
}

.sk-card__desc {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--text-muted);
  margin-top: auto;
  transition: color 0.4s ease;
}
.sk-card:hover .sk-card__title {
  color: var(--sk-color-primary-dark);
}

/* Tilt on hover */
.sk-card:hover {
  transform: rotate(-2.5deg) translateY(-6px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

.sk-card:nth-child(2):hover {
  transform: rotate(2deg) translateY(-6px);
}
.sk-card:nth-child(3):hover {
  transform: rotate(-1.8deg) translateY(-6px);
}
.sk-card:nth-child(4):hover {
  transform: rotate(2.2deg) translateY(-6px);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .sk-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .sk-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }

  .sk-header__right {
    align-items: flex-start;
  }

  .sk-header__sub {
    text-align: left;
  }
}

@media (max-width: 520px) {
  .sk-cards {
    grid-template-columns: 1fr;
  }

  .sk-card {
    min-height: 240px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sk-card,
  .sk-card__fill,
  .sk-card__inner,
  .sk-card__desc,
  .sk-card__num {
    transition: none !important;
  }
}