/**
 * Homepage left-edge section scroll indicator.
 */

:root {
  --section-indicator-width: 3px;
  --section-indicator-dot-size: 6px;
  --section-indicator-offset-left: clamp(12px, 2vw, 20px);
  --section-indicator-dot-inactive: rgba(250, 249, 254, 0.28);
  --section-indicator-dot-active: var(--color-red, #de242f);
  --section-indicator-rail-color: rgba(250, 249, 254, 0.12);
  --section-indicator-progress: 0;
}

.site-section-indicator {
  display: none !important;
  position: fixed;
  left: var(--section-indicator-offset-left);
  top: 50%;
  z-index: calc(var(--z-index-header, 999) - 2);
  flex-direction: column;
  flex-direction: column;
  align-items: center;
  gap: 0;
  width: var(--section-indicator-dot-size);
  transform: translateY(-50%);
  pointer-events: none;
}

.site-section-indicator__rail {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: var(--section-indicator-width);
  margin-left: calc(var(--section-indicator-width) * -0.5);
  border-radius: 999px;
  background: var(--section-indicator-rail-color);
  overflow: hidden;
}

.site-section-indicator__fill {
  display: block;
  width: 100%;
  height: calc(var(--section-indicator-progress, 0) * 100%);
  min-height: var(--section-indicator-dot-size);
  border-radius: inherit;
  background: linear-gradient(
    180deg,
    transparent 0%,
    var(--section-indicator-dot-active) 40%,
    var(--section-indicator-dot-active) 100%
  );
  opacity: 0.85;
  transition: height 0.35s ease;
}

.site-section-indicator__list {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(10px, 1.8vh, 16px);
  margin: 0;
  padding: clamp(8px, 1.5vh, 14px) 0;
  list-style: none;
}

.site-section-indicator__dot {
  display: flex;
  align-items: center;
  justify-content: center;
  width: max(var(--section-indicator-dot-size), 28px);
  height: max(var(--section-indicator-dot-size), 28px);
  padding: 0;
  border: 0;
  background: transparent;
  text-decoration: none;
  pointer-events: auto;
  cursor: pointer;
  border-radius: 999px;
  transition: transform 0.25s ease;
}

.site-section-indicator__dot-core {
  display: block;
  width: var(--section-indicator-dot-size);
  height: var(--section-indicator-dot-size);
  border-radius: 999px;
  background: var(--section-indicator-dot-inactive);
  box-shadow: 0 0 0 0 transparent;
  transition:
    background 0.3s ease,
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.site-section-indicator__dot.is-active .site-section-indicator__dot-core,
.site-section-indicator__dot:focus-visible .site-section-indicator__dot-core {
  background: var(--section-indicator-dot-active);
  transform: scale(1.35);
  box-shadow: 0 0 10px rgba(222, 36, 47, 0.45);
}

.site-section-indicator__dot:focus-visible {
  outline: 2px solid var(--section-indicator-dot-active);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .site-section-indicator__fill,
  .site-section-indicator__dot,
  .site-section-indicator__dot-core {
    transition: none;
  }
}