/* The library: shell, shelves, grid and list. Mobile first. */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; font-size: 85%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1rem/1.45 var(--ui);
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button, select, input { font: inherit; color: inherit; }
button, select { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
h1, h2 { font-family: var(--serif); margin: 0; }
.muted { color: var(--muted); }
.small { font-size: .8rem; }
.strong { font-weight: 600; }
.note { color: var(--muted); }
.pad { padding: 0 16px; }
.problem { margin: 16px; padding: .25rem .75rem; border-left: 4px solid var(--danger); }
.row { display: flex; }
.row.between { justify-content: space-between; }
.row.gap { gap: 8px; }
.row.center { align-items: center; }
.ellipsis { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* header */
.top {
  position: sticky; top: 0; z-index: 20;
  padding: 10px 0 0;
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.top.scrolled { border-bottom: 1px solid var(--line); }
.top-row { display: flex; align-items: center; justify-content: space-between;
  height: 46px; max-width: 64rem; margin: 0 auto; padding: 0 16px; }
.top h1 { font-size: 1.7rem; font-weight: 700; letter-spacing: -.01em; line-height: 1;
  transition: font-size .15s ease; }
.top.scrolled h1 { font-size: 1.25rem; }
.top-tools { display: flex; }
.icon-btn { display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border: 0; background: transparent; }
.pills { display: flex; gap: 8px; overflow-x: auto; padding: 6px 16px 12px;
  max-width: 64rem; margin: 0 auto; scrollbar-width: none; }
.pills::-webkit-scrollbar, .rail::-webkit-scrollbar, .chips::-webkit-scrollbar { display: none; }
.pill { flex: 0 0 auto; height: 38px; padding: 0 18px; border-radius: 19px;
  border: 1px solid var(--line-strong); background: var(--card); font-weight: 600; }
.pill[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }

main { max-width: 64rem; margin: 0 auto; padding: 0 0 104px; outline: none; }
.block { padding-top: 22px; }
.rail-head { display: flex; align-items: baseline; justify-content: space-between;
  padding: 0 16px; margin-bottom: 12px; }
.rail-head h2 { font-size: 1.15rem; font-weight: 600; line-height: 1.2; }
.see-all { font-size: .85rem; font-weight: 600; color: var(--accent); }
.eyebrow { font-size: .72rem; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent); }

/* covers */
.cover { --w: 82px; position: relative; display: flex; align-items: flex-end;
  justify-content: center; width: var(--w); aspect-ratio: 2 / 3;
  border-radius: 2px 5px 5px 2px; overflow: hidden; color: #fff;
  padding: 0 8px 14px; box-shadow: 0 5px 9px rgba(40,30,10,.34); }
.cover.big { --w: 82px; border-radius: 3px 7px 7px 3px; box-shadow: 0 8px 16px rgba(40,30,10,.32); }
.cover.small { --w: 44px; padding: 0; border-radius: 2px 4px 4px 2px; }
.cover.small .cover-title { display: none; }
.cover .spine { position: absolute; top: 0; bottom: 0; left: 0; width: 8px;
  background: linear-gradient(90deg, rgba(0,0,0,.34), rgba(255,255,255,.16) 45%, transparent); }
.cover-title { display: -webkit-box; -webkit-line-clamp: 5; -webkit-box-orient: vertical;
  overflow: hidden; text-align: center; font: 700 .8rem/1.1 var(--serif);
  text-shadow: 0 1px 6px rgba(0,0,0,.55); overflow-wrap: anywhere; }
.cover.has-image .cover-title { display: none; }
.rank { position: absolute; top: 0; right: 8px; width: 28px; height: 36px; padding-top: 6px;
  text-align: center; background: var(--accent); color: var(--on-accent); font-weight: 700;
  font-size: .85rem; clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 80%, 0 100%); }
.due-badge { position: absolute; top: 6px; left: 12px; padding: 2px 7px; border-radius: 9px;
  background: rgba(0,0,0,.72); font-size: .75rem; font-weight: 700; }

/* shelves */
.rail { display: flex; gap: 12px; overflow-x: auto; padding: 6px 16px 4px;
  scroll-snap-type: x proximity; scroll-padding-left: 16px; scrollbar-width: none; }
.rail > * { scroll-snap-align: start; }
.cell { display: block; flex: 0 0 auto; width: var(--w, 82px); min-width: 0; }
.cell .cover { width: 100%; }
.cell.large { --w: 106px; }
.cell.large .cover-title { font-size: .9rem; }
.cell:active { opacity: .8; }
.plank { height: 9px; margin: 0 -7px; background: var(--plank);
  border-radius: 0 0 2px 2px; box-shadow: 0 4px 7px rgba(70,50,15,.2); }
.status { margin-top: 8px; display: flex; align-items: center; gap: 6px; min-height: 18px;
  font-size: .78rem; font-weight: 600; color: var(--muted); }
.status .new { padding: 1px 6px; border-radius: 3px; background: var(--accent);
  color: var(--on-accent); font-size: .72rem; font-weight: 700; letter-spacing: .04em; }
.status .pct { color: var(--ink); }
.status .finished { display: inline-flex; align-items: center; gap: 4px; color: var(--accent); }

/* continue and banner */
.continue { display: flex; gap: 14px; margin: 0 16px; padding: 14px; border-radius: 14px;
  background: var(--card); border: 1px solid var(--line); box-shadow: 0 6px 18px rgba(80,60,20,.1); }
.continue .cover.big { --w: 82px; }
.continue-body { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.continue-title { margin-top: 4px; font: 600 1.15rem/1.18 var(--serif); }
.continue-foot { margin-top: auto; padding-top: 12px; }
.continue .bar, .row-body .bar { height: 5px; border-radius: 3px; background: var(--track);
  overflow: hidden; margin-top: 6px; }
.bar.thin { flex: 1; height: 4px; margin: 0; }
.bar-fill { height: 100%; background: var(--accent); }
.btn { display: inline-flex; align-items: center; justify-content: center; flex: 1;
  min-height: 44px; padding: 0 14px; border-radius: 8px; border: 1.5px solid transparent;
  font-weight: 700; white-space: nowrap; }
.btn.go { background: var(--accent); color: var(--on-accent); }
.btn.ghost { border-color: var(--accent); color: var(--accent); background: transparent; }
.btn.dark { background: var(--ink); color: var(--paper); flex: 0 0 auto; align-self: flex-start; margin-top: 6px; }
.banner { display: flex; align-items: center; gap: 16px; margin: 0 16px; padding: 18px 16px 18px 18px;
  border-radius: 16px; overflow: hidden; border: 1px solid var(--line);
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 10%, var(--card)),
    color-mix(in srgb, var(--accent) 24%, var(--card))); }
.banner-text { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 8px; }
.banner-head { font: 600 1.3rem/1.12 var(--serif); overflow-wrap: anywhere; }
.tilt { flex: 0 0 auto; transform: rotate(3deg); }
.tilt .cover.big { --w: 86px; box-shadow: 0 12px 22px rgba(40,30,10,.38); }

/* all books */
.all .search { display: block; width: calc(100% - 32px); margin: 0 16px 12px; height: 44px;
  padding: 0 12px; border-radius: 10px; border: 1px solid var(--line-strong); background: var(--card); }
.chips { display: flex; gap: 8px; overflow-x: auto; padding: 0 16px 12px; scrollbar-width: none; }
.chip { flex: 0 0 auto; height: 36px; padding: 0 14px; border-radius: 18px; font-weight: 600;
  border: 1px solid var(--line-strong); background: var(--card); }
.chip[aria-pressed="true"] { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.tools { display: flex; gap: 8px; align-items: center; padding: 0 16px 18px; }
.tools select { flex: 1; min-width: 0; height: 44px; padding: 0 10px; border-radius: 10px;
  border: 1px solid var(--line-strong); background: var(--card); }
.tool { display: inline-flex; align-items: center; gap: 6px; flex: 0 0 auto; height: 44px;
  padding: 0 12px; border-radius: 10px; border: 1px solid var(--line-strong);
  background: var(--card); font-size: .88rem; font-weight: 600; }
.seg { display: flex; flex: 0 0 auto; padding: 3px; border-radius: 10px; background: var(--track); }
.seg button { width: 40px; height: 38px; border: 0; border-radius: 8px; background: transparent; color: var(--ink-soft); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(76px, 1fr)); gap: 16px 12px; padding: 4px 21px 0; }
.grid .cell { width: auto; }
.rows { padding: 0 16px; }
.row-book { display: flex; gap: 14px; padding: 12px 0; border-top: 1px solid var(--line); }
.row-body { flex: 1; min-width: 0; display: flex; flex-direction: column; justify-content: center; gap: 2px; }
.row-title { font: 600 1rem/1.25 var(--serif); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* detail, tabs, skeleton */
.detail { padding: 26px 16px 0; display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }
.detail .btn { flex: 0 0 auto; }
.tabs { position: fixed; left: 0; right: 0; bottom: 0; z-index: 20; display: flex;
  padding: 8px 8px max(14px, env(safe-area-inset-bottom)); background: color-mix(in srgb, var(--card) 96%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-top: 1px solid var(--line); }
.tabs a { flex: 1; min-height: 56px; display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 3px; font-size: .8rem; font-weight: 600; color: var(--muted); }
.tabs a[aria-current="page"] { color: var(--accent); }
.skel { background: var(--track); border-radius: 6px; animation: pulse 1.4s ease-in-out infinite; }
.skel.line { height: 22px; width: 40%; margin: 0 16px 14px; }
.cover-skel { flex: 0 0 82px; aspect-ratio: 2 / 3; }
@keyframes pulse { 50% { opacity: .55; } }
.signin { padding: 24px 16px; display: flex; flex-direction: column; gap: 14px; align-items: flex-start; }
.signin .btn { flex: 0 0 auto; }

@media (min-width: 700px) {
  .grid { grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 20px 16px; }
  .cell { --w: 98px; }
  .cell.large { --w: 124px; }
  .continue .cover.big, .tilt .cover.big { --w: 106px; }
  .continue, .banner { margin: 0 16px; }
}
@media (prefers-reduced-motion: reduce) {
  *, .top h1 { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}
[hidden] { display: none !important; }

/* touch targets: keep the look, widen the hit area to 44px */
.pill, .chip, .seg button { position: relative; }
.pill::after, .chip::after { content: ""; position: absolute; inset: -4px 0; }
.seg button::after { content: ""; position: absolute; inset: -3px 0; }
.see-all { display: inline-block; padding: 12px 0 12px 12px; margin: -12px 0; }

/* form fields stay 16px: smaller makes iPhones zoom in when you tap */
.all .search, .tools select { font-size: 16px; }