:root {
  color-scheme: light;
  font-family: "Helvetica Neue", "Noto Sans SC", Arial, sans-serif;
  font-synthesis: none;
  --ink: #111111;
  --muted: #8d8d8d;
  --paper: #ffffff;
  --footer-height: 2.5rem;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 20rem;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

button {
  border: 0;
  padding: 0;
  font: inherit;
  color: inherit;
  background: none;
}

button:focus-visible {
  outline: 1px solid var(--ink);
  outline-offset: 0.35rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.stage,
.view {
  min-height: 100svh;
}

.view[hidden] {
  display: none;
}

.mode-canvas,
.mode-viewer {
  overflow: hidden;
}

.canvas-view {
  position: fixed;
  inset: 0;
  overflow: hidden;
  touch-action: none;
  background: var(--paper);
}

.photo-trail {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.trail-photo {
  position: absolute;
  width: min(60vw, calc((100svh - var(--footer-height)) * 0.6 * var(--ratio)));
  transform: translate(-50%, -50%);
  cursor: zoom-in;
  pointer-events: auto;
  opacity: 1;
  will-change: transform, opacity;
}

.trail-photo img {
  display: block;
  width: 100%;
  height: auto;
  pointer-events: none;
  user-select: none;
}

.overview-view {
  min-height: 100vh;
  padding: clamp(5rem, 7vw, 7.5rem) clamp(1.25rem, 5vw, 6rem) 9rem;
  background: var(--paper);
}

.gallery {
  columns: 18rem;
  column-gap: clamp(1.5rem, 2.2vw, 2.75rem);
  margin: 0 auto;
}

.gallery-item {
  display: block;
  width: 100%;
  margin: 0 0 clamp(1.5rem, 2.2vw, 2.75rem);
  break-inside: avoid;
  cursor: zoom-in;
}

.gallery-item img {
  display: block;
  width: 100%;
  height: auto;
  background: #f4f4f4;
  transition: opacity 180ms ease;
}

.gallery-item:hover img {
  opacity: 0.76;
}

.viewer {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 0 0 var(--footer-height);
  background: var(--paper);
}

.viewer-zone {
  position: absolute;
  z-index: 1;
  top: 0;
  bottom: var(--footer-height);
  width: 50%;
  cursor: none;
}

.viewer-zone--previous {
  left: 0;
}

.viewer-zone--next {
  right: 0;
}

.viewer-photo {
  position: relative;
  z-index: 2;
  display: grid;
  width: min(100vw, calc((100svh - var(--footer-height)) * var(--ratio)));
  cursor: pointer;
  transform-origin: center;
  will-change: transform;
}

.viewer-photo img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  user-select: none;
  opacity: 1;
}

.viewer-photo.is-close-armed {
  cursor: none;
}

.viewer-cursor-label {
  position: fixed;
  z-index: 4;
  pointer-events: none;
  color: #ffffff;
  font-size: 1rem;
  line-height: 1;
  letter-spacing: 0.015em;
  white-space: nowrap;
  opacity: 0;
  transform: translate(-50%, -50%);
}

.viewer-cursor-label.is-visible {
  opacity: 1;
}

.viewer-cursor-label.is-navigation {
  color: var(--ink);
}

.photo-status {
  position: fixed;
  z-index: 60;
  top: 50%;
  left: 50%;
  display: flex;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.875rem;
  transform: translate(-50%, -50%);
}

.photo-status[hidden],
.photo-status button[hidden] {
  display: none;
}

.photo-status button {
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.site-footer {
  position: fixed;
  z-index: 100;
  right: 0;
  bottom: 0;
  left: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: var(--footer-height);
  padding: 0 1.25rem;
  font-size: 0.875rem;
  line-height: 1;
  letter-spacing: 0.01em;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0), #ffffff 38%);
  pointer-events: none;
}

.site-title,
.site-nav,
.photo-count {
  padding-top: 0;
  pointer-events: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.nav-button {
  cursor: pointer;
  color: var(--muted);
}

.nav-button:hover,
.nav-button.is-active {
  color: var(--ink);
}

.photo-count {
  justify-self: end;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

@media (max-width: 48rem) {
  :root {
    --footer-height: 3rem;
  }

  .overview-view {
    padding: 4.75rem 1rem 7rem;
  }

  .gallery {
    columns: 2;
    column-gap: 1rem;
  }

  .gallery-item {
    margin-bottom: 1rem;
  }

  .viewer {
    padding: 0 0 var(--footer-height);
  }

  .viewer-zone,
  .viewer-photo {
    cursor: pointer;
  }

  .site-footer {
    padding: 0 0.75rem;
    font-size: 0.8125rem;
  }

  .site-title {
    max-width: 5rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}