:root {
  color-scheme: dark;
  background: #080909;
  color: #dfded6;
  font-family: "Courier New", monospace;
  font-synthesis: none;
  --gutter: 28px;
  --footer: 64px;
  --cover-height: clamp(100px, 16svh, 150px);
  --preview-gap: 36px;
  --preview-space: calc(var(--cover-height) + var(--preview-gap) + 44px + var(--footer) + 12px);
  --header-clearance: 150px;
}

* { box-sizing: border-box; }
body { margin: 0; }
[hidden] { display: none !important; }
button, a { -webkit-tap-highlight-color: transparent; color: inherit; }
button { font: inherit; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.library-shell {
  position: relative;
  height: max(600px, 100svh);
  isolation: isolate;
  overflow: hidden;
}

.masthead {
  position: absolute;
  z-index: 3;
  top: 26px;
  left: var(--gutter);
  right: var(--gutter);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  pointer-events: none;
  font-size: 0.875rem;
  line-height: 1.55;
  letter-spacing: 0.025em;
  text-transform: uppercase;
}

.masthead h1 { margin: 0; font-size: inherit; font-weight: 400; }
.masthead p { margin: 0; }
.masthead .masthead__count { margin-top: 17px; color: #94968e; }
.masthead__aside { text-align: right; color: #94968e; }
.masthead__aside span { display: block; margin-bottom: 4px; letter-spacing: 0.19em; }

.shelf-stage { position: absolute; inset: 0 0 var(--preview-space); }

.shelf-viewport {
  position: absolute;
  inset: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  overscroll-behavior-x: contain;
  touch-action: pan-x pan-y;
}

.shelf-viewport::-webkit-scrollbar { display: none; }

.shelf {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 3px;
  width: max-content;
  min-width: 100%;
  height: 100%;
  margin: 0;
  padding: 0 var(--gutter);
  list-style: none;
  user-select: none;
  -webkit-user-select: none;
  animation: shelf-arrive 0.6s both;
}

.volume {
  position: relative;
  flex: none;
  width: clamp(36px, 3vw, 48px);
  height: calc((max(600px, 100svh) - var(--preview-space) - var(--header-clearance)) * var(--height));
  min-height: 120px;
}

.volume__link {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
  text-decoration: none;
  cursor: grab;
  touch-action: none;
  -webkit-touch-callout: none;
}

.binding {
  position: absolute;
  display: block;
  inset: 0;
  overflow: hidden;
  background: var(--paper);
  color: var(--ink);
  border-radius: 2px 2px 1px 1px;
  box-shadow: inset 1px 0 0 #ffffff24, inset -1px 0 0 #0004;
  transition: transform 0.3s cubic-bezier(0.2, 0.7, 0.2, 1), filter 0.3s;
}

.binding__title {
  position: absolute;
  left: 50%;
  top: 30%;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: translateX(-50%);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.625rem;
  line-height: 1;
  white-space: nowrap;
  font-weight: 400;
  letter-spacing: 0.01em;
}

.volume__link:hover .binding,
.volume__link:focus-visible .binding { transform: translateY(-5px); filter: brightness(1.08); }

.volume__link:focus-visible::after {
  content: "";
  position: absolute;
  inset: -5px;
  border: 1px solid #c3c6b5;
  border-radius: 3px;
}

.library-footer {
  position: absolute;
  z-index: 5;
  bottom: 0;
  left: var(--gutter);
  right: var(--gutter);
  height: var(--footer);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.shelf-scroll-cue { display: flex; align-items: center; gap: 18px; color: #92958c; }
.shelf-progress { position: relative; width: 80px; height: 2px; background: #31352f; }
.shelf-progress span { position: absolute; top: 0; height: 100%; background: #c1c6b5; }
.footer-note { color: #92958c; }
.footer-selection { color: #cccfc3; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mobile-note { display: none; }

.cover-preview {
  position: fixed;
  z-index: 10;
  left: 0;
  top: 0;
  width: calc(var(--cover-height) * 0.75);
  margin: 0;
  pointer-events: none;
  visibility: hidden;
  opacity: 0;
  transform: translateY(16px) scale(0.96);
  transform-origin: 50% 0;
  transition: transform 0.38s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.2s, visibility 0.38s;
  filter: drop-shadow(0 10px 14px #0008);
}

.cover-preview.is-visible { visibility: visible; opacity: 1; transform: translateY(0) scale(1); }

.cover-preview__book {
  display: grid;
  align-items: center;
  height: var(--cover-height);
  padding: 12px;
  background: var(--paper);
  color: var(--ink);
  border-radius: 1px 3px 3px 1px;
  box-shadow: inset 2px 0 0 #0003, 1px 0 0 #fff3, 2px 1px 0 #ffffff1a;
}

.cover-preview__title { font: 1rem Georgia, "Times New Roman", serif; }
.cover-preview figcaption { margin-top: 10px; color: #c3c0ad; font-size: 0.75rem; }

.volume--placeholder {
  border: 1px dashed #a3aa9070;
  border-radius: 2px;
  background: #a3aa9010;
  box-shadow: inset 0 -2px #c5ceac;
}

.volume--ghost {
  position: fixed;
  z-index: 30;
  left: 0;
  top: 0;
  margin: 0;
  pointer-events: none;
  filter: drop-shadow(9px 12px 12px #0009);
}

.volume--ghost .binding { transform: none; filter: brightness(1.12); }
.is-arranging, .is-arranging * { cursor: grabbing !important; user-select: none !important; }
.is-arranging .volume__link .binding { transform: none; }

.order-reset {
  display: block;
  pointer-events: auto;
  margin: 9px 0 0;
  padding: 0;
  border: 0;
  background: none;
  color: #a9ae9c;
  font-size: 0.875rem;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.order-reset:hover { color: #e2e5d6; }
.order-reset:focus-visible { outline: 1px solid #c3c6b5; outline-offset: 5px; }
.no-script { position: absolute; top: 40%; left: var(--gutter); right: var(--gutter); text-align: center; }

@keyframes shelf-arrive {
  from { opacity: 0; transform: translateY(22px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (min-width: 1600px) {
  :root { --gutter: 42px; }
}

@media (max-width: 1000px) {
  .footer-selection { display: none; }
}

@media (max-width: 600px) {
  :root { --gutter: 18px; --preview-gap: 28px; }
  .masthead { top: 21px; }
  .masthead__aside, .desktop-note { display: none; }
  .mobile-note { display: inline; }
  .library-footer { gap: 12px; flex-wrap: wrap; align-content: center; }
  .shelf-progress { width: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .cover-preview, .cover-preview.is-visible { transform: none; }
}