/**
 * Approach/Principles Section — Bird Capital Website
 * Compact list layout for 7 principles
 */

.approach {
  background-color: var(--color-background-light);
}

.approach__header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.approach__title {
  font-family: var(--font-primary);
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-dark);
}

/* Pillars grid - compact layout */
.approach__pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

/* Individual pillar card - compact */
.pillar {
  display: flex;
  flex-direction: column;
  border-left: 3px solid var(--color-accent);
  background-color: var(--color-background-white);
}

/* Clickable header for accordion */
.pillar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  gap: var(--space-sm);
  transition: background-color 0.2s ease;
}

.pillar__header:hover {
  background-color: rgba(0, 0, 0, 0.02);
}

.pillar__header:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

/* Chevron icon */
.pillar__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  position: relative;
  transition: transform 0.3s ease;
}

.pillar__icon::before,
.pillar__icon::after {
  content: '';
  position: absolute;
  background-color: var(--color-accent);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Horizontal line (always visible) */
.pillar__icon::before {
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  transform: translateY(-50%);
}

/* Vertical line (hidden when expanded) */
.pillar__icon::after {
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  transform: translateX(-50%);
}

/* Expanded state: hide vertical line (plus becomes minus) */
.pillar__header[aria-expanded="true"] .pillar__icon::after {
  opacity: 0;
  transform: translateX(-50%) rotate(90deg);
}

.pillar__title {
  margin: 0;
  font-family: var(--font-primary);
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-dark);
  line-height: 1.3;
}

/* Collapsible content */
.pillar__content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

/* Expanded state */
.pillar.is-expanded .pillar__content {
  max-height: 500px;
}

.pillar__text {
  padding: var(--space-sm) var(--space-md) var(--space-md);
  margin: 0;
  font-family: var(--font-secondary);
  font-size: 0.9375rem;
  line-height: var(--line-height-relaxed);
  color: var(--color-text-medium);
}

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

/* Tablet and up - single column, max-width for readability */
@media (min-width: 768px) {
  .approach__pillars {
    max-width: 800px;
    margin: 0 auto;
  }

  .pillar__header {
    padding: var(--space-sm) var(--space-lg);
  }

  .pillar__text {
    padding: var(--space-sm) var(--space-lg) var(--space-md);
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .approach__header {
    margin-bottom: var(--space-xl);
  }

  .pillar__title {
    font-size: 1.125rem;
  }

  .pillar__text {
    font-size: 0.9375rem;
  }
}

/* Large desktop */
@media (min-width: 1440px) {
  .approach__pillars {
    max-width: 900px;
  }

  .pillar__header {
    padding: var(--space-md) var(--space-xl);
  }

  .pillar__title {
    font-size: 1.25rem;
  }

  .pillar__text {
    padding: var(--space-sm) var(--space-xl) var(--space-lg);
  }
}