/* ─────────────────────────────────────────────────────────
   EXPERTISE — Full-service accordion list
   ───────────────────────────────────────────────────────── */

.expertise {
  background: #ffffff;
  padding: 120px var(--pad) 140px;
}

.expertise-inner {
  max-width: 1720px;
  margin: 0 auto;
}

.expertise-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: end;
  margin-bottom: 80px;
}

.expertise-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #f0824b;
  margin-bottom: 20px;
}

.expertise-headline {
  font-size: clamp(38px, 5vw, 72px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.02;
  color: var(--text);
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.expertise-headline .accent {
  color: #f0824b;
  font-style: italic;
  font-weight: 400;
  font-family: 'Times New Roman', Times, serif;
}

.expertise-lede {
  font-size: 17px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 520px;
  justify-self: end;
}

.expertise-lede strong {
  color: var(--text);
  font-weight: 700;
}

.expertise-list {
  border-top: 1px solid #e4e4e0;
  list-style: none;
  padding: 0;
  margin: 0;
}

.expertise-item {
  border-bottom: 1px solid #e4e4e0;
  transition: background 0.4s ease;
}

.expertise-item:hover {
  background: #fafaf7;
}

.expertise-item-row {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  align-items: center;
  gap: 40px;
  padding: 36px 24px;
  cursor: pointer;
  user-select: none;
}

.expertise-num {
  font-family: 'Times New Roman', Times, serif;
  font-style: italic;
  font-size: clamp(48px, 5vw, 72px);
  font-weight: 400;
  color: var(--text);
  line-height: 1;
  letter-spacing: -0.02em;
  transition: color 0.3s ease;
}

.expertise-item:hover .expertise-num,
.expertise-item.open .expertise-num {
  color: #f0824b;
}

.expertise-title {
  font-size: clamp(24px, 2.4vw, 36px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.15;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

.expertise-toggle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 1.5px solid #e4e4e0;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.3s ease, border-color 0.3s ease, transform 0.4s ease;
  padding: 0;
}

.expertise-item:hover .expertise-toggle {
  border-color: #f0824b;
}

.expertise-item.open .expertise-toggle {
  background: #f0824b;
  border-color: #f0824b;
  transform: rotate(45deg);
}

.expertise-toggle svg {
  width: 20px;
  height: 20px;
  stroke: var(--text);
  stroke-width: 2;
  transition: stroke 0.3s ease;
}

.expertise-item.open .expertise-toggle svg {
  stroke: #ffffff;
}

.expertise-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.5s ease;
}

.expertise-item.open .expertise-body {
  grid-template-rows: 1fr;
}

.expertise-body-inner {
  overflow: hidden;
}

.expertise-body-content {
  display: grid;
  grid-template-columns: 140px 1fr 1fr auto;
  gap: 40px;
  padding: 0 24px 44px;
  align-items: start;
}

.expertise-body-content .expertise-body-spacer {
  /* empty column under the number */
}

.expertise-desc {
  font-size: 16px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 520px;
}

.expertise-features {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.expertise-features li {
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
  padding-left: 22px;
  position: relative;
}

.expertise-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #f0824b;
}

.expertise-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  background: var(--text);
  color: #ffffff;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  transition: background 0.3s ease, transform 0.3s ease;
  white-space: nowrap;
  align-self: start;
}

.expertise-cta:hover {
  background: #f0824b;
  transform: translateX(4px);
}

@media (max-width: 900px) {
  .expertise {
    padding: 80px var(--pad) 100px;
  }

  .expertise-header {
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 48px;
  }

  .expertise-lede {
    justify-self: start;
  }

  .expertise-item-row {
    grid-template-columns: 70px 1fr auto;
    gap: 20px;
    padding: 24px 8px;
  }

  .expertise-num {
    font-size: 36px;
  }

  .expertise-title {
    font-size: 20px;
  }

  .expertise-toggle {
    width: 44px;
    height: 44px;
  }

  .expertise-body-content {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 0 8px 32px;
  }

  .expertise-body-spacer {
    display: none;
  }
}