/* ============================================
   Work History Section + 3D Timeline
   ============================================ */

.work-history {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: calc(var(--nav-height) + 3rem) 2rem 4rem;
  background: var(--color-bg-section);
  transition: var(--transition-theme);
}

.work-history__canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.work-history__container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 900px;
}

.work-history__heading {
  font-family: 'Raleway', sans-serif;
  font-weight: 300;
  text-align: center;
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 3rem;
  color: rgba(232, 232, 239, 0.45);
}

/* --- Timeline --- */

.timeline {
  position: relative;
  perspective: 1200px;
  perspective-origin: center 40%;
}

/* Central vertical line */
.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-timeline-line);
  transform: translateX(-50%);
}

/* --- Timeline Entries --- */

.timeline__entry {
  position: relative;
  display: flex;
  justify-content: flex-end;
  width: 50%;
  padding: 0 2.5rem 3rem 0;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1),
              opacity 0.6s ease;
}

/* Alternate sides */
.timeline__entry:nth-child(even) {
  margin-left: 50%;
  justify-content: flex-start;
  padding: 0 0 3rem 2.5rem;
}

/* --- Marker dot on the center line --- */

.timeline__marker {
  position: absolute;
  right: -8px;
  top: 0.5rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-marker);
  border: 3px solid var(--color-bg-section);
  box-shadow: 0 0 10px var(--color-accent-glow);
  z-index: 2;
  transition: var(--transition-theme);
}

.timeline__entry:nth-child(even) .timeline__marker {
  right: auto;
  left: -8px;
}

/* --- Card --- */

.timeline__card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-card-border);
  border-radius: 12px;
  padding: 1.5rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: var(--transition-theme), box-shadow 0.3s ease;
}

.timeline__card:hover {
  box-shadow: 0 8px 30px var(--color-accent-glow);
}

.timeline__logo {
  display: block;
  height: 32px;
  width: auto;
  max-width: 120px;
  margin-top: 0.5rem;
  margin-bottom: 0.75rem;
  object-fit: contain;
}

/* Dark mode — screen strips white raster backgrounds, lifts dark logo art */
[data-theme="dark"] .timeline__logo {
  mix-blend-mode: screen;
  opacity: 0.9;
  filter: brightness(1.25) contrast(1.05);
}

/* Dark-art logos (black lettering) — invert to off-white so they read against dark cards */
[data-theme="dark"] .timeline__logo--dark-art {
  mix-blend-mode: normal;
  filter: invert(1) brightness(0.88) contrast(1.0);
  opacity: 0.9;
}

/* Light mode — multiply strips white backgrounds, preserves coloured logo art */
[data-theme="light"] .timeline__logo {
  mix-blend-mode: multiply;
  opacity: 0.9;
  filter: brightness(0.92) contrast(1.05);
}

/* Dark-art logos retain their natural colors in light mode */
[data-theme="light"] .timeline__logo--dark-art {
  mix-blend-mode: multiply;
  filter: brightness(0.9) contrast(1.05);
  opacity: 0.9;
}

/* Color-art logos (colored art on white bg)
   invert(1) → white bg becomes black (screen makes it transparent)
   hue-rotate(170deg) → shifts inverted navy (~hsl 29°) to target hue 199° (#049FD9)
   saturate(1.2) brightness(0.57) → match #049FD9 saturation/lightness */
[data-theme="dark"] .timeline__logo--color-art {
  filter: invert(1) hue-rotate(170deg) saturate(1.2) brightness(0.57);
  mix-blend-mode: screen;
  opacity: 0.95;
}

/* Light mode — multiply strips white background, colored art reads naturally */
[data-theme="light"] .timeline__logo--color-art {
  mix-blend-mode: multiply;
  filter: brightness(0.9) contrast(1.05);
  opacity: 0.9;
}

/* Large logo variant — double the base 32px height */
.timeline__logo--lg {
  height: 64px;
  max-width: 240px;
}

.timeline__date {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.timeline__role {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.timeline__company {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  opacity: 0.85;
  margin-bottom: 0.75rem;
}

.timeline__description {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* --- Responsive: Stack on mobile --- */

@media (max-width: 768px) {
  .timeline::before {
    left: 1rem;
  }

  .timeline__entry,
  .timeline__entry:nth-child(even) {
    width: 100%;
    margin-left: 0;
    justify-content: flex-start;
    padding: 0 0 2rem 3rem;
  }

  .timeline__marker,
  .timeline__entry:nth-child(even) .timeline__marker {
    left: 0.5rem;
    right: auto;
  }
}