/* Responsive Design */

/* Tablets and small desktops */
@media (max-width: 992px) {
  .timeline::before,
  .timeline::after {
    left: 40px;
  }

  .timeline-icon {
    left: 40px;
  }

  .timeline-item,
  .timeline-item:nth-child(odd),
  .timeline-item:nth-child(even) {
    justify-content: flex-end;
    padding-left: 80px;
    padding-right: 20px;
    box-sizing: border-box;
  }

  .timeline-content {
    width: 100%;
    text-align: left;
  }

  .connecting-line {
    display: none;
  }

  .timeline-item:nth-child(odd) .tags-container,
  .timeline-item:nth-child(even) .tags-container {
    justify-content: flex-start;
  }

  .header-section h1 {
    font-size: 3.5rem;
  }
}

/* Mobile Devices */
@media (max-width: 768px) {
  /* Hide the central vertical timeline line on mobile */
  .timeline::before,
  .timeline::after {
    display: none;
  }

  /* Hide timeline icons on mobile */
  .timeline-icon {
    display: none;
  }

  /* Hide the scroll percentage badge on mobile */
  #timelineProgressBadge {
    display: none !important;
  }

  .timeline-item,
  .timeline-item:nth-child(odd),
  .timeline-item:nth-child(even) {
    padding-left: 15px;
    padding-right: 15px;
  }

  .timeline-content {
    padding: 25px 20px;
  }

  .header-section {
    padding: 100px 15px 40px;
  }

  .header-section h1 {
    font-size: 2.5rem;
  }

  .header-section p {
    font-size: 1.1rem;
  }

  .offcanvas {
    width: 100% !important;
    border-radius: 0;
  }

  .stepper-nav-outer {
    margin: 0 10px 20px;
    top: 10px;
    gap: 4px;
  }

  .stepper-arrow {
    width: 28px;
    height: 28px;
    font-size: 1.1rem;
    flex-shrink: 0;
  }

  .stepper-wrapper {
    padding: 10px;
    border-radius: 20px;
  }

  .timeline-content h3 {
    font-size: 1.4rem;
  }
}

/* =============================================
   Mobile Screen Border Trace Animation
   Only visible on mobile (max-width: 768px)
   Traces top → right → bottom → left as user scrolls
   ============================================= */
.mobile-border-trace {
  display: none; /* hidden on desktop */
  pointer-events: none;
}

@media (max-width: 768px) {
  .mobile-border-trace {
    display: block;
  }

  /* Base styles for all 4 border lines */
  .border-line {
    position: fixed;
    pointer-events: none;
    z-index: 9998;
    border-radius: 2px;
    transition:
      width 0.08s ease-out,
      height 0.08s ease-out;
  }

  /* TOP — grows left → right */
  .border-top {
    top: 0;
    left: 0;
    height: 3px;
    width: 0;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    box-shadow:
      0 0 10px var(--primary),
      0 0 20px var(--secondary);
  }

  /* RIGHT — grows top → bottom */
  .border-right {
    top: 0;
    right: 0;
    width: 3px;
    height: 0;
    background: linear-gradient(to bottom, var(--secondary), var(--accent));
    box-shadow:
      0 0 10px var(--secondary),
      0 0 20px var(--accent);
  }

  /* BOTTOM — grows right → left */
  .border-bottom {
    bottom: 0;
    right: 0;
    height: 3px;
    width: 0;
    background: linear-gradient(to left, var(--accent), var(--primary));
    box-shadow:
      0 0 10px var(--accent),
      0 0 20px var(--primary);
  }

  /* LEFT — grows bottom → top */
  .border-left {
    bottom: 0;
    left: 0;
    width: 3px;
    height: 0;
    background: linear-gradient(to top, var(--primary), var(--secondary));
    box-shadow:
      0 0 10px var(--primary),
      0 0 20px var(--secondary);
  }
}