.section-header {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: bold;
    }
    .section-header i {
      transition: transform 0.3s ease;
    }
    .section-header.collapsed i {
      transform: rotate(-90deg);
    }
    .collapse {
      transition: height var(--transition-duration, 0.35s) var(--transition-easing, ease);
    }
    .flash-glow {
      animation: flash 1s ease-in-out;
    }
    @keyframes flash {
      0% { background-color: #fff3cd; }
      100% { background-color: transparent; }
    }