:root {
  color-scheme: light;
}

body {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  text-decoration: none;
}

.input-field {
  border-radius: 0.5rem;
  border: 1px solid rgba(120, 53, 15, 0.3);
  background-color: rgba(254, 243, 199, 0.85);
  padding: 0.6rem 0.75rem;
  color: #4a2f0b;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.input-field:focus {
  outline: none;
  border-color: rgba(180, 83, 9, 0.6);
  box-shadow: 0 0 0 2px rgba(180, 83, 9, 0.2);
}

.btn-adjust {
  display: flex;
  height: 2rem;
  width: 2rem;
  align-items: center;
  justify-content: center;
  border-radius: 0.375rem;
  border: 1px solid rgba(120, 113, 108, 0.3);
  background-color: white;
  color: rgba(87, 83, 78, 1);
  font-weight: 700;
  transition: background-color 150ms ease;
}

.btn-adjust:hover {
  background-color: rgba(245, 245, 244, 1);
}

/* Timeline layout */

/* Mobile: single column with line on left */
.timeline-line {
  left: 1rem;
}

.timeline-item {
  padding-left: 3rem;
}

.timeline-node {
  left: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
}

.timeline-heading {
  position: sticky;
  top: 0;
  z-index: 10;
  background-color: #fefce8; /* amber-50, matches page background */
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s ease;
}

.timeline-heading.is-stuck {
  border-bottom-color: #b45309; /* amber-700 */
}

.timeline-top-btn {
  display: none;
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  padding: 0.25rem;
  color: #b45309; /* amber-700 */
  opacity: 0.7;
  transition: opacity 0.15s ease;
}

.timeline-top-btn:hover {
  opacity: 1;
}

.timeline-heading.is-stuck .timeline-top-btn {
  display: block;
}

/* Desktop: alternating cards with central line */
@media (min-width: 768px) {
  .timeline-heading {
    text-align: center;
  }

  .timeline-list {
    display: flex;
    flex-direction: column;
  }

  .timeline-line {
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline-item {
    width: 50%;
    padding-left: 0;
    padding-right: 0;
  }

  /* Left side items (odd) */
  .timeline-item-left {
    align-self: flex-start;
    padding-right: 2rem;
  }

  .timeline-item-left .timeline-node {
    right: -10px;
    left: auto;
  }

  /* Right side items (even) */
  .timeline-item-right {
    align-self: flex-end;
    padding-left: 2rem;
  }

  .timeline-item-right .timeline-node {
    left: -10px;
  }

  /* Allow vertical overlap between alternating cards (skip first item) */
  .timeline-item + .timeline-item {
    margin-top: -4rem;
  }
}