/* timeline.css */

.timeline {
  margin-top: 60px;
}

.timeline__track {
  display: flex;
  align-items: center;
  padding: 0 16px;
}

/* segments = hover targets */
.timeline__seg {
  position: relative;
  display: flex;
  align-items: center;
  height: 22px;
  cursor: pointer;
  overflow: visible;
}

/* actual line drawn inside segment */
.timeline__seg::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 2px;
  background: var(--line);
  border-radius: 999px;
}

/* invisible bridge so hover doesn't break in the gap */
.timeline__seg::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 70px;
  background: transparent;
  z-index: 1;
}

/* length tuning */
.timeline__seg--outer {
  flex: 0.55;
}
.timeline__seg--inner {
  flex: 1.2;
}

/* dot + year */
.timeline__node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  user-select: none;
  pointer-events: none;
}

.timeline__year {
  font-weight: 800;
  color: var(--muted);
  font-size: 14px;
  line-height: 1;
}

.dot {
  width: 10px;
  height: 10px;
  background: var(--dot);
  border-radius: 50%;
}

/* card */
.timeline__card {
  position: absolute;
  left: 50%;
  top: 26px;
  transform: translateX(-50%);
  width: 250px;

  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;

  box-shadow: var(--shadowCard);
  z-index: 10;

  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: 0.18s ease;
}

.timeline__card h3 {
  font-size: 14px;
  font-weight: 900;
  margin-bottom: 6px;
}

.timeline__card p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
  margin-bottom: 8px;
}

.timeline__card small {
  color: var(--muted);
  font-weight: 700;
  font-size: 12px;
}

/* links inside timeline card */
.timeline__card a {
  color: var(--text);
  font-weight: 800;
  text-decoration: underline;
}

.timeline__card a:hover {
  opacity: 0.8;
}

/* show card while hover or active */
.timeline__seg:hover .timeline__card,
.timeline__seg:has(.timeline__card:hover) .timeline__card,
.timeline__seg.is-active .timeline__card {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* line darker on hover */
.timeline__seg:hover::before,
.timeline__seg.is-active::before {
  background: var(--text);
}

/* =============================
   MOBILE: Vertical Timeline
   ============================= */
@media (max-width: 720px) {
  .timeline__track {
    flex-direction: column;
    align-items: center;
    padding: 0 20px;
  }

  .timeline__seg {
    width: 2px;
    height: 80px;
    flex-direction: column;
    justify-content: center;
    position: relative;
  }

  /* Vertical line (centered) */
  .timeline__seg::before {
    left: 50%;
    right: auto;
    top: 0;
    bottom: 0;
    width: 2px;
    height: 100%;
    transform: translateX(-50%);
  }

  /* Invisible tap area */
  .timeline__seg::after {
    left: 50%;
    transform: translateX(-50%);
    top: 0;
    bottom: 0;
    width: 60px;
    height: 100%;
  }

  /* All segments same size */
  .timeline__seg--outer,
  .timeline__seg--inner {
    flex: none;
    height: 80px;
  }

  /* Dot + Year (centered on line) */
  .timeline__node {
    flex-direction: column;
    gap: 8px;
    z-index: 2;
  }

  .dot {
    width: 12px;
    height: 12px;
  }

  .timeline__year {
    font-size: 13px;
  }

  /* Card appears below the dot */
  .timeline__card {
    position: absolute;
    left: 50%;
    top: auto;
    bottom: auto;
    transform: translateX(-50%);
    width: min(280px, 90vw);
    margin-top: 80px;
  }

  /* Keep hover/click behavior */
  .timeline__seg:hover::before,
  .timeline__seg.is-active::before {
    background: var(--text);
  }
}

/* --------------- */
/* --------------- */
/* TIMELINE: Scroll animations */

#timeline {
  opacity: 0;
  transform: translateY(50px);
  transition:
    opacity 0.8s ease,
    transform 0.8s ease;
}

#timeline.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Animate timeline elements with stagger */
.timeline__track {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 1s ease 0.2s,
    transform 1s ease 0.2s;
}

#timeline.is-visible .timeline__track {
  opacity: 1;
  transform: translateY(0);
}