/* === Expertise Section — Next-Gen Flat Design === */
#expertise {
  padding-top: 6rem;
  padding-bottom: 8rem;
  position: relative;
  overflow: hidden;
  background: linear-gradient(
    160deg,
    #f8fffe 0%,
    #f0fdfa 30%,
    #ecfeff 60%,
    #f5fdfd 100%
  );
}

/* --- Floating Decorative Elements --- */
#expertise .deco-blob {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
  filter: blur(60px);
}

#expertise .deco-blob--1 {
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, #2dd4bf 0%, #14b8a6 80%);
  top: -80px;
  right: -60px;
  animation: blobFloat 8s ease-in-out infinite alternate;
}

#expertise .deco-blob--2 {
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, #5eead4 0%, #0d9488 80%);
  bottom: 10%;
  left: -80px;
  animation: blobFloat 10s ease-in-out infinite alternate-reverse;
}

#expertise .deco-blob--3 {
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, #a7f3d0 0%, #34d399 80%);
  top: 45%;
  right: 15%;
  animation: blobFloat 12s ease-in-out infinite alternate;
}

@keyframes blobFloat {
  0% {
    transform: translate(0, 0) scale(1);
  }
  100% {
    transform: translate(30px, -30px) scale(1.1);
  }
}

/* --- Decorative Dots Pattern --- */
#expertise .deco-dots {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(15, 118, 110, 0.08) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* --- Section Header --- */
#expertise .section-title {
  font-weight: 800;
  font-size: 2.75rem;
  background: linear-gradient(135deg, #0f766e 0%, #14b8a6 50%, #0d9488 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
  letter-spacing: -0.8px;
  position: relative;
  z-index: 1;
}

#expertise .section-subtitle {
  color: #5a8f8a;
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 500;
  font-size: 1.1rem;
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

/* --- Expertise Grid --- */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 2rem;
  position: relative;
  z-index: 1;
}

@media (min-width: 768px) {
  .expertise-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  /* 3rd card centered below, spanning full width */
  .expertise-card:nth-child(3) {
    grid-column: 1 / -1;
    justify-self: center;
    width: 50%;
  }
}

@media (min-width: 1024px) {
  .expertise-grid {
    gap: 2rem;
  }

  .expertise-card:nth-child(3) {
    width: 50%;
  }
}

@media (min-width: 1280px) {
  .expertise-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .expertise-card:nth-child(3) {
    grid-column: unset;
    justify-self: unset;
    width: unset;
  }
}

/* --- Expertise Card (Next-Gen Flat) --- */
.expertise-card {
  position: relative;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 1.25rem;
  padding: 2rem 1.75rem;
  border: 1px solid rgba(15, 118, 110, 0.08);
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.02),
    0 8px 32px rgba(15, 118, 110, 0.06);
  transition:
    transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.5s ease,
    border-color 0.4s ease;
  opacity: 0;
  transform: translateY(40px);
}

.expertise-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.expertise-card:nth-child(1) { transition-delay: 0s; }
.expertise-card:nth-child(2) { transition-delay: 0.12s; }
.expertise-card:nth-child(3) { transition-delay: 0.24s; }

.expertise-card:hover {
  transform: translateY(-6px);
  box-shadow:
    0 4px 12px rgba(15, 118, 110, 0.08),
    0 20px 48px rgba(15, 118, 110, 0.12);
  border-color: rgba(15, 118, 110, 0.18);
}

/* --- Card Top Gradient Border Accent --- */
.expertise-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 1.5rem;
  right: 1.5rem;
  height: 3px;
  background: linear-gradient(90deg, #0f766e, #14b8a6, #5eead4);
  border-radius: 0 0 3px 3px;
  opacity: 0;
  transition: opacity 0.4s ease, transform 0.4s ease;
  transform: scaleX(0.6);
}

.expertise-card:hover::before {
  opacity: 1;
  transform: scaleX(1);
}

/* --- Card Glow Ring (on hover) --- */
.expertise-card::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 1.25rem;
  background: linear-gradient(135deg, rgba(20, 184, 166, 0.08), transparent 40%, transparent 60%, rgba(45, 212, 191, 0.08));
  z-index: -1;
  opacity: 0;
  transition: opacity 0.5s ease;
}

.expertise-card:hover::after {
  opacity: 1;
}

/* --- Card Icon (Numbered Badge) --- */
.expertise-card-icon {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 0.875rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.08), rgba(20, 184, 166, 0.06));
  border: 1px solid rgba(15, 118, 110, 0.08);
  transition:
    transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
    background 0.4s ease,
    border-color 0.4s ease,
    box-shadow 0.4s ease;
}

.expertise-card:hover .expertise-card-icon {
  transform: scale(1.06);
  background: linear-gradient(135deg, rgba(15, 118, 110, 0.14), rgba(20, 184, 166, 0.1));
  border-color: rgba(15, 118, 110, 0.16);
  box-shadow: 0 8px 24px rgba(15, 118, 110, 0.1);
}

.expertise-card-number {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #0f766e;
  line-height: 1;
  transition: color 0.4s ease, transform 0.4s ease;
  user-select: none;
}

.expertise-card:hover .expertise-card-number {
  color: #14b8a6;
  transform: scale(1.1);
}

/* --- Card Title --- */
.expertise-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #0f766e;
  margin-bottom: 1.5rem;
  letter-spacing: -0.3px;
  transition: color 0.4s ease;
}

.expertise-card:hover .expertise-card-title {
  color: #0d9488;
}

/* --- Tech Items List --- */
.expertise-card .space-y-3 > * + * {
  margin-top: 0.875rem;
}

/* --- Tech Item Row (Next-Gen Flat) --- */
.tech-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.625rem 0.75rem;
  border-radius: 0.75rem;
  background: transparent;
  border: 1px solid transparent;
  transition:
    background 0.35s ease,
    border-color 0.35s ease,
    transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow 0.35s ease;
  position: relative;
  cursor: default;
}

.tech-item:hover {
  background: rgba(255, 255, 255, 0.75);
  border-color: rgba(15, 118, 110, 0.1);
  transform: translateX(6px);
  box-shadow: 0 2px 12px rgba(15, 118, 110, 0.06);
}

/* --- Tech Icons Group --- */
.tech-icons {
  flex-shrink: 0;
  display: flex;
  gap: 0.4rem;
  transition: transform 0.35s ease;
}

.tech-item:hover .tech-icons {
  transform: scale(1.06);
}

.tech-icons img {
  height: 2.25rem;
  width: 2.25rem;
  object-fit: contain;
  border-radius: 0.375rem;
  transition:
    transform 0.35s ease,
    filter 0.35s ease;
}

.tech-item:hover .tech-icons img {
  transform: translateY(-2px);
  filter: drop-shadow(0 4px 12px rgba(15, 118, 110, 0.2));
}

/* --- Tech Info --- */
.tech-info {
  flex-grow: 1;
  min-width: 0;
}

.tech-info .tech-name {
  font-weight: 700;
  color: #1f2937;
  font-size: 0.925rem;
  transition: color 0.3s ease;
  line-height: 1.3;
}

.tech-item:hover .tech-info .tech-name {
  color: #0f766e;
}

.tech-info .tech-desc {
  font-size: 0.8rem;
  color: #9ca3af;
  margin-top: 0.1rem;
  transition: color 0.3s ease;
  line-height: 1.4;
}

.tech-item:hover .tech-info .tech-desc {
  color: #6b7280;
}

/* --- Skill Level Indicator (dot) --- */
.tech-item .skill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #d1d5db;
  flex-shrink: 0;
  transition: background 0.35s ease, transform 0.35s ease;
}

.tech-item:hover .skill-dot {
  background: #14b8a6;
  transform: scale(1.3);
  box-shadow: 0 0 8px rgba(20, 184, 166, 0.4);
}

/* --- Responsive --- */
@media (max-width: 767px) {
  #expertise {
    padding-top: 4rem;
    padding-bottom: 5rem;
  }

  #expertise .section-title {
    font-size: 2.1rem;
  }

  .expertise-card {
    padding: 1.5rem;
  }

  .tech-item {
    padding: 0.5rem 0.6rem;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .expertise-card {
    padding: 1.75rem 1.5rem;
  }
}