:root {
  color-scheme: light;
  --paper: #f7f7f5;
  --ink: #181816;
  --line: rgba(24, 24, 22, 0.16);
  --toolbar-h: 58px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  overflow-x: hidden;
}
button, a { font: inherit; }
button { color: inherit; }

.toolbar {
  position: fixed;
  z-index: 50;
  top: 0;
  left: 0;
  right: 0;
  height: var(--toolbar-h);
  padding: max(12px, env(safe-area-inset-top)) clamp(14px, 2vw, 30px) 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: rgba(247, 247, 245, 0.82);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.brand {
  color: inherit;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
}
.toolbar__right { display: flex; align-items: center; gap: clamp(10px, 2vw, 22px); }
.counter { font-size: 12px; letter-spacing: 0.08em; white-space: nowrap; }
.control {
  appearance: none;
  border: 0;
  background: none;
  padding: 7px 0;
  cursor: pointer;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: 1px solid transparent;
}
.control:hover, .control:focus-visible { border-bottom-color: currentColor; outline: none; }

main { padding-top: var(--toolbar-h); }
.page {
  min-height: calc(100svh - var(--toolbar-h));
  padding: clamp(14px, 2.8vw, 44px);
  display: grid;
  place-items: center;
  scroll-margin-top: var(--toolbar-h);
  scroll-snap-align: start;
}
.page img {
  display: block;
  width: min(100%, calc((100svh - var(--toolbar-h) - clamp(28px, 5.6vw, 88px)) * 16 / 9));
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #fff;
  box-shadow: 0 14px 48px rgba(20, 20, 18, 0.07);
  user-select: none;
  -webkit-user-drag: none;
}

.page-arrow {
  position: fixed;
  z-index: 40;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(247, 247, 245, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  cursor: pointer;
  font-size: 18px;
  display: grid;
  place-items: center;
}
.page-arrow:hover, .page-arrow:focus-visible { background: #fff; outline: 1px solid var(--ink); }
.page-arrow--prev { left: clamp(8px, 1.2vw, 20px); }
.page-arrow--next { right: clamp(8px, 1.2vw, 20px); }
.page-arrow:disabled { opacity: 0.18; cursor: default; }

.overview {
  width: min(1180px, calc(100vw - 32px));
  max-height: min(88svh, 900px);
  padding: 0;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 30px 100px rgba(0,0,0,0.18);
}
.overview::backdrop { background: rgba(15, 15, 14, 0.48); backdrop-filter: blur(5px); }
.overview__header {
  position: sticky;
  z-index: 2;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: rgba(247,247,245,0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.overview__header strong { font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; }
.overview__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 20px;
}
.overview__grid a { position: relative; color: inherit; text-decoration: none; border: 1px solid var(--line); background: #fff; }
.overview__grid a:hover, .overview__grid a:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
.overview__grid img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.overview__grid span { position: absolute; right: 8px; bottom: 7px; padding: 3px 5px; background: rgba(255,255,255,0.88); font-size: 11px; }

.noscript { position: fixed; bottom: 12px; left: 12px; right: 12px; padding: 12px; background: #fff; border: 1px solid var(--line); }

@media (min-width: 900px) {
  html { scroll-snap-type: y mandatory; }
}

@media (max-width: 899px) {
  :root { --toolbar-h: 54px; }
  .toolbar { padding-inline: 14px; }
  .brand { font-size: 12px; }
  .toolbar__right { gap: 12px; }
  .control { font-size: 11px; }
  #fullscreenButton { display: none; }
  .page {
    min-height: auto;
    padding: 24px 0;
  }
  .page img {
    width: 100%;
    box-shadow: none;
  }
  .page-arrow { display: none; }
  .overview__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; padding: 12px; }
}

@media (max-width: 480px) {
  .counter { display: none; }
  .overview__grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}