.expertise-section {
  --exp-navy: #003389;
  --exp-navy-dark: #00276f;
  --exp-blue-accent: #003389;
  --exp-btn: #003198;
  --exp-btn-hover: #00276f;
  --exp-text-dark: #101828;
  --exp-text-muted: #667085;
  --exp-bg: #ffffff;
  --exp-font-heading: var(--font-primary, "Poppins", "Segoe UI", sans-serif);
  --exp-font-body: var(--font-secondary, "Inter", "Segoe UI", sans-serif);

  width: 100%;
  padding: 48px 2vw 56px;
  background: var(--exp-bg);
  font-family: var(--exp-font-body);
  box-sizing: border-box;
  overflow: hidden;
  position: relative;
}

/* Top-Left Corner Fading Dot Grid Decor */
.expertise-section .expertise-dots-decor-tl {
  position: absolute;
  top: 0;
  left: 0;
  width: 180px;
  height: 180px;
  background-image: radial-gradient(var(--exp-btn, #003198) 1.5px, transparent 1.5px);
  background-size: 12px 12px;
  opacity: 0.25;
  -webkit-mask-image: radial-gradient(circle at 0% 0%, rgba(0,0,0,1) 20%, rgba(0,0,0,0) 80%);
  mask-image: radial-gradient(circle at 0% 0%, rgba(0,0,0,1) 20%, rgba(0,0,0,0) 80%);
  pointer-events: none;
  z-index: 1;
  animation: expDotsRunning 5s linear infinite;
  will-change: background-position;
}

/* Bottom-Right Horizontal Fading Dot Grid Decor */
.expertise-section .expertise-dots-decor-br {
  position: absolute;
  bottom: 12px;
  right: 40px;
  width: 320px;
  height: 70px;
  background-image: radial-gradient(var(--exp-btn, #003198) 1.8px, transparent 1.8px);
  background-size: 14px 12px;
  opacity: 0.28;
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 30%, rgba(0,0,0,0) 95%);
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,1) 30%, rgba(0,0,0,0) 95%);
  pointer-events: none;
  z-index: 1;
  animation: expDotsRunningHorizontal 4s linear infinite;
  will-change: background-position;
}

@keyframes expDotsRunning {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 24px 24px;
  }
}

@keyframes expDotsRunningHorizontal {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 28px 0;
  }
}

.expertise-section * {
  box-sizing: border-box;
}

.expertise-container {
  width: 100%;
  max-width: var(--container-width, 1320px);
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

/* ---------- Header row ---------- */

.expertise-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 40px;
  opacity: 0;
  transform: translateY(26px);
  transition:
    opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.expertise-section.is-in-view .expertise-header {
  opacity: 1;
  transform: translateY(0);
}

.expertise-header-left {
  flex: 0 1 auto;
}

.expertise-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--exp-font-heading);
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--exp-blue-accent);
  margin-bottom: 12px;
}

.expertise-eyebrow i {
  font-size: 0.6rem;
}

.expertise-heading {
  font-family: var(--exp-font-heading);
  font-size: 38px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--exp-text-dark);
  margin: 0;
  letter-spacing: normal;
}

.expertise-heading-line2 {
  display: block;
}

.expertise-header-right {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: flex-end;
  gap: 16px;
  padding-bottom: 4px;
  margin-left: auto;
}

.expertise-desc {
  font-family: var(--exp-font-body);
  font-size: 0.94rem;
  line-height: 1.6;
  color: var(--exp-text-muted);
  margin: 0;
  text-align: left;
}

.expertise-view-all {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--exp-font-heading);
  font-weight: 600;
  font-size: 0.9rem;
  color: #ffffff;
  background: var(--exp-btn);
  border-radius: 999px;
  padding: 5px 12px;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 6px 16px rgba(0, 49, 152, 0.22);
  transition:
    background 0.3s ease,
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.expertise-view-all i {
  font-size: 0.78rem;
  transition: transform 0.25s ease;
}

.expertise-view-all:hover {
  background: var(--exp-btn-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(0, 49, 152, 0.3);
}

.expertise-view-all:hover i {
  transform: translateX(3px);
}

/* ---------- Slider ---------- */

.expertise-slider {
  position: relative;
}

.expertise-viewport {
  overflow: hidden;
  border-radius: 4px;
}

.expertise-track {
  display: flex;
  gap: 12px;
  will-change: transform;
  transition: transform 0.55s cubic-bezier(0.65, 0, 0.35, 1);
  cursor: grab;
  user-select: none;
}

.expertise-track:active {
  cursor: grabbing;
}

.expertise-track.is-dragging {
  transition: none;
}

/* ---------- Card ---------- */

.expertise-card {
  position: relative;
  flex: 0 0 calc((100% - 4 * 12px) / 5);
  min-width: 0;
  height: 280px;
  border-radius: 6px;
  overflow: hidden;
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.expertise-section.is-in-view .expertise-card {
  opacity: 1;
  transform: translateY(0);
}

.expertise-section.is-in-view .expertise-card:nth-child(1) {
  transition-delay: 0.08s;
}
.expertise-section.is-in-view .expertise-card:nth-child(2) {
  transition-delay: 0.16s;
}
.expertise-section.is-in-view .expertise-card:nth-child(3) {
  transition-delay: 0.24s;
}
.expertise-section.is-in-view .expertise-card:nth-child(4) {
  transition-delay: 0.32s;
}
.expertise-section.is-in-view .expertise-card:nth-child(n + 5) {
  transition-delay: 0.38s;
}

.expertise-card-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
  -webkit-user-drag: none;
}

.expertise-card:hover .expertise-card-img {
  transform: scale(1.06);
}

.expertise-card-overlay {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--exp-navy);
  padding: 16px 18px 18px;
  transition: padding 0.3s ease;
}

.expertise-card-title {
  font-family: var(--exp-font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: #ffffff;
  margin: 0 0 5px;
  line-height: 1.3;
}

.expertise-card-subtitle {
  font-family: var(--exp-font-body);
  font-size: 0.8rem;
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.78);
  margin: 0;
}

/* ---------- Navigation arrows ---------- */

.expertise-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--exp-btn);
  color: #ffffff;
  font-size: 0.85rem;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(0, 49, 152, 0.3);
  transition:
    background 0.25s ease,
    transform 0.25s ease,
    box-shadow 0.25s ease;
}

.expertise-nav:hover {
  background: var(--exp-btn-hover);
  transform: translateY(-50%) scale(1.08);
}

.expertise-nav:active {
  transform: translateY(-50%) scale(0.96);
}

.expertise-nav--prev {
  left: -22px;
}

.expertise-nav--next {
  right: -22px;
}

.expertise-nav:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* ---------- Dots ---------- */

.expertise-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 26px;
}

.expertise-dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: #d0d5dd;
  border: none;
  padding: 0;
  cursor: pointer;
  transition:
    width 0.3s ease,
    background 0.3s ease;
}

.expertise-dot.is-active {
  width: 24px;
  background: var(--exp-navy);
}

@media (prefers-reduced-motion: reduce) {
  .expertise-header,
  .expertise-card {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .expertise-track {
    transition: none !important;
  }
  .expertise-card-img {
    transition: none !important;
  }
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

/* 4 cards visible on mid-size desktops */
@media (max-width: 1100px) {
  .expertise-card {
    flex: 0 0 calc((100% - 3 * 12px) / 4);
  }
}

/* Stack header, 2 cards visible on tablets */
@media (max-width: 900px) {
  .expertise-section {
    padding: 52px 6vw 60px;
  }
  .expertise-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 32px;
  }
  .expertise-header-right {
    flex: 1 1 auto;
    align-items: flex-start;
  }
  .expertise-heading {
    font-size: 30px;
  }
  .expertise-card {
    flex: 0 0 calc((100% - 18px) / 2);
    height: 300px;
  }
  .expertise-nav--prev {
    left: 6px;
  }
  .expertise-nav--next {
    right: 6px;
  }
}

/* 1 card visible on phones */
@media (max-width: 560px) {
  .expertise-section {
    padding: 44px 6vw 52px;
  }
  .expertise-heading {
    font-size: clamp(1.35rem, 6vw, 1.7rem);
  }
  .expertise-desc {
    font-size: 0.88rem;
  }
  .expertise-card {
    flex: 0 0 100%;
    height: 320px;
  }
  .expertise-nav {
    width: 38px;
    height: 38px;
    font-size: 0.75rem;
  }
}