/* SPDX-License-Identifier: LicenseRef-PolyForm-Shield-1.0.0 */
/*
 * lsd-timeline.css — timeline layout components.
 *
 * Three layout flavours that share a common `.lsd-timeline__item` child
 * structure. The arc variant arranges items around the circumference of
 * an invisible arc using individual rotate+translate transforms.
 *
 * Tokens consumed: --accent, --border-color, --ink
 *
 * Usage:
 *   <ol class="lsd-timeline lsd-timeline--arc">
 *     <li class="lsd-timeline__item"><span>2021</span><p>...</p></li>
 *     ...
 *   </ol>
 */

.lsd-timeline {
  list-style: none;
  padding: 0; margin: 0;
}

/* Vertical (default) */
.lsd-timeline--vertical {
  display: flex; flex-direction: column; gap: 20px;
  position: relative; padding-inline-start: 28px;
}
.lsd-timeline--vertical::before {
  content: ''; position: absolute; left: 8px; top: 8px; bottom: 8px;
  width: 2px; background: color-mix(in oklch, var(--accent, #6af) 50%, transparent);
}
.lsd-timeline--vertical .lsd-timeline__item {
  position: relative;
}
.lsd-timeline--vertical .lsd-timeline__item::before {
  content: ''; position: absolute; left: -28px; top: 4px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent, #6af);
  box-shadow: 0 0 0 4px color-mix(in oklch, var(--accent, #6af) 25%, transparent);
}

/* Horizontal */
.lsd-timeline--horizontal {
  display: flex; gap: 24px;
  position: relative; padding-block-start: 28px;
  overflow-x: auto;
}
.lsd-timeline--horizontal::before {
  content: ''; position: absolute; top: 8px; left: 8px; right: 8px;
  height: 2px; background: color-mix(in oklch, var(--accent, #6af) 50%, transparent);
}
.lsd-timeline--horizontal .lsd-timeline__item {
  position: relative; min-width: 180px;
}
.lsd-timeline--horizontal .lsd-timeline__item::before {
  content: ''; position: absolute; top: -28px; left: 4px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent, #6af);
  box-shadow: 0 0 0 4px color-mix(in oklch, var(--accent, #6af) 25%, transparent);
}

/* Arc — items distributed along the top half of a circle.
 * Authors override --tl-radius and --tl-count for fine control. */
.lsd-timeline--arc {
  --tl-radius: 220px;
  --tl-count: 7;
  --tl-arc: 180deg; /* total sweep */
  position: relative;
  width: calc(var(--tl-radius) * 2 + 80px);
  height: calc(var(--tl-radius) + 60px);
  margin-inline: auto;
}
.lsd-timeline--arc::before {
  content: ''; position: absolute;
  left: 50%; bottom: 0;
  width: calc(var(--tl-radius) * 2);
  height: calc(var(--tl-radius) * 2);
  transform: translateX(-50%);
  border: 2px dashed color-mix(in oklch, var(--accent, #6af) 50%, transparent);
  border-radius: 50%;
  clip-path: inset(0 0 50% 0);
  pointer-events: none;
}
.lsd-timeline--arc .lsd-timeline__item {
  position: absolute;
  left: 50%; bottom: 0;
  width: 140px;
  text-align: center;
  transform-origin: 50% calc(100% + var(--tl-radius));
  --i: 0;
  transform:
    translateX(-50%)
    rotate(calc(var(--tl-arc) * ((var(--i) / (var(--tl-count) - 1)) - 0.5)))
    translateY(calc(var(--tl-radius) * -1))
    rotate(calc(-1 * var(--tl-arc) * ((var(--i) / (var(--tl-count) - 1)) - 0.5)));
}
.lsd-timeline--arc .lsd-timeline__item:nth-child(1) { --i: 0; }
.lsd-timeline--arc .lsd-timeline__item:nth-child(2) { --i: 1; }
.lsd-timeline--arc .lsd-timeline__item:nth-child(3) { --i: 2; }
.lsd-timeline--arc .lsd-timeline__item:nth-child(4) { --i: 3; }
.lsd-timeline--arc .lsd-timeline__item:nth-child(5) { --i: 4; }
.lsd-timeline--arc .lsd-timeline__item:nth-child(6) { --i: 5; }
.lsd-timeline--arc .lsd-timeline__item:nth-child(7) { --i: 6; }
.lsd-timeline--arc .lsd-timeline__item:nth-child(8) { --i: 7; }
.lsd-timeline--arc .lsd-timeline__item:nth-child(9) { --i: 8; }
.lsd-timeline--arc .lsd-timeline__item .lsd-timeline__dot {
  display: block; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent, #6af);
  margin: 0 auto 8px;
  box-shadow: 0 0 0 4px color-mix(in oklch, var(--accent, #6af) 25%, transparent);
}