:root {
  --bg: #faf8f5;
  --panel: #ffffff;
  --text: #1c1b1a;
  --muted: #6f6a63;
  --accent: #b5462a;
  --accent-soft: #f6e3dd;
  --border: #e5e0d8;
  --star: #e8a83c;
  --shadow: 0 1px 3px rgba(0,0,0,.07);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --panel: #202226;
    --text: #eceae6;
    --muted: #9d9992;
    --accent: #e07a5f;
    --accent-soft: #3a2a25;
    --border: #33353a;
    --shadow: 0 1px 3px rgba(0,0,0,.4);
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header { padding: 1.4rem 2rem .4rem; }
header h1 { margin: 0; font-size: 1.7rem; letter-spacing: -.02em; }
header .accent { color: var(--accent); }
.tagline { margin: .15rem 0 0; color: var(--muted); font-size: .95rem; }

.layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 1.5rem;
  padding: 1rem 2rem 2rem;
  align-items: start;
}
.layout[hidden] { display: none; }

/* ---------- tabs ---------- */
.tabs { display: flex; gap: .45rem; padding: .9rem 2rem 0; }
.tab {
  font: inherit;
  font-size: .9rem;
  font-weight: 600;
  padding: .45rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
.tab:hover { border-color: var(--accent); }
.tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- filter panel ---------- */
.filters {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 1rem;
  z-index: 1; /* stacking context: keep result-card star overlays underneath */
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
}

/* Drawer chrome — only visible on mobile (see media query below) */
.filters-head {
  display: none;
  position: sticky;
  top: 0;
  z-index: 2;
  align-items: center;
  justify-content: space-between;
  margin: -1rem -1rem .8rem;
  padding: .8rem 1rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  border-radius: 16px 16px 0 0;
  font-weight: 700;
  font-size: .95rem;
}
.filters-close {
  border: none;
  background: none;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1;
  padding: .35rem .55rem;
  cursor: pointer;
}
.filters-close:hover { color: var(--accent); border: none; }
.filters-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(0,0,0,.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
}
.filters-backdrop.show { opacity: 1; pointer-events: auto; }
.filters-fab {
  display: none;
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: calc(1rem + env(safe-area-inset-bottom));
  z-index: 50;
  align-items: center;
  gap: .45rem;
  padding: .7rem 1.35rem;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: .95rem;
  box-shadow: 0 4px 16px rgba(0,0,0,.3);
  cursor: pointer;
}
.filters-fab:hover { border: none; }
.field { margin-bottom: .7rem; }
.field-row { display: flex; gap: .6rem; }
.field-row .field { flex: 1; }
.field label {
  display: block;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  margin-bottom: .2rem;
}
input[type=text], input[type=number], select {
  width: 100%;
  padding: .42rem .55rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: .9rem;
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.check {
  display: flex;
  gap: .45rem;
  align-items: baseline;
  font-size: .86rem;
  margin: .35rem 0;
  cursor: pointer;
}

.facet-group { border-top: 1px solid var(--border); padding-top: .6rem; margin-top: .8rem; }
.facet-group h3 {
  margin: 0 0 .3rem;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  font-weight: 600;
}
.facet-option {
  display: flex;
  gap: .45rem;
  align-items: baseline;
  font-size: .86rem;
  padding: .12rem 0;
  cursor: pointer;
}
.facet-option .count { margin-left: auto; color: var(--muted); font-size: .76rem; }
.facet-more {
  background: none; border: none; color: var(--accent);
  font-size: .8rem; cursor: pointer; padding: .2rem 0;
}

.advanced { margin-top: .9rem; border-top: 1px solid var(--border); padding-top: .6rem; }
.advanced summary { cursor: pointer; font-size: .85rem; color: var(--muted); margin-bottom: .5rem; }

.actions { display: flex; gap: .5rem; margin-bottom: 1rem; flex-wrap: wrap; }
button {
  font: inherit;
  font-size: .88rem;
  padding: .5rem .9rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
button:hover { border-color: var(--accent); }
button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  flex: 1;
  font-weight: 600;
}
button.primary:disabled { opacity: .55; cursor: wait; }

/* ---------- status / progress ---------- */
.status { margin-bottom: 1rem; }
.status .bar {
  height: 8px;
  border-radius: 4px;
  background: var(--border);
  overflow: hidden;
}
.status .fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 4px;
  transition: width .25s ease;
}
.status p { margin: .35rem 0 0; font-size: .85rem; color: var(--muted); }

.summary {
  font-size: .85rem;
  color: var(--muted);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: .6rem .9rem;
  margin-bottom: 1rem;
}
.summary .warn { color: var(--accent); font-weight: 600; }

/* ---------- result cards ---------- */
.books { list-style: none; margin: 0; padding: 0; display: grid; gap: .7rem; }
.book {
  display: grid;
  grid-template-columns: 2.6rem 74px 1fr;
  gap: .9rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: .8rem .9rem;
  box-shadow: var(--shadow);
}
.book .rank {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--muted);
  text-align: center;
  align-self: start;
  padding-top: .2rem;
}
.book.top3 .rank { color: var(--accent); }
.book .cover {
  width: 74px; height: 110px;
  object-fit: cover;
  border-radius: 6px;
  background: var(--accent-soft);
  box-shadow: var(--shadow);
}
.book .cover.placeholder {
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
}
.book h2 { margin: 0; font-size: 1.02rem; }
.book .byline { color: var(--muted); font-size: .86rem; margin: .1rem 0 .3rem; }
.book .meta { font-size: .8rem; color: var(--muted); }
.book .meta .flag { color: var(--accent); }
.book .desc {
  margin: .35rem 0 0;
  font-size: .84rem;
  color: var(--muted);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  cursor: pointer;
}
.book .desc.open { -webkit-line-clamp: unset; }

.rating-row { display: flex; align-items: center; gap: .5rem; margin: .25rem 0; flex-wrap: wrap; }
.stars { position: relative; display: inline-block; font-size: .95rem; line-height: 1; }
.stars .off { color: var(--border); }
.stars .on {
  color: var(--star);
  position: absolute; left: 0; top: 0;
  overflow: hidden; white-space: nowrap;
}
.rating-num { font-weight: 700; }
.rating-count { color: var(--muted); font-size: .8rem; }
.weighted {
  font-size: .72rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  padding: .1rem .5rem;
  font-weight: 600;
}
.unrated { color: var(--muted); font-size: .84rem; font-style: italic; }

.chips { display: flex; flex-wrap: wrap; gap: .3rem; margin-top: .3rem; }
.chip {
  font-size: .72rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .05rem .5rem;
  color: var(--muted);
}
.chip.avail { border-color: transparent; background: var(--accent-soft); color: var(--accent); }

.links { margin-top: .35rem; font-size: .82rem; display: flex; gap: .9rem; }

.empty { color: var(--muted); text-align: center; padding: 3rem 0; }
footer { padding: 1rem 2rem 2rem; color: var(--muted); font-size: .8rem; }
footer p { max-width: 60rem; }

@media (max-width: 560px) {
  .book { grid-template-columns: 2rem 56px 1fr; }
  .book .cover { width: 56px; height: 84px; }
  .book h2 { font-size: .95rem; }
  .links { flex-wrap: wrap; gap: .6rem .9rem; }
  header, .tabs, .layout, footer { padding-left: 1rem; padding-right: 1rem; }
  header h1 { font-size: 1.45rem; }
}

/* ---------- mobile: filters as a bottom-sheet drawer ---------- */
@media (max-width: 800px) {
  .layout {
    grid-template-columns: 1fr;
    /* keep the last result card clear of the floating Filters button */
    padding-bottom: calc(5rem + env(safe-area-inset-bottom));
  }

  .filters {
    position: fixed;
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 60;
    max-height: 85vh;  /* fallback */
    max-height: 85dvh;
    border-radius: 16px 16px 0 0;
    border-bottom: none;
    padding-bottom: calc(1.2rem + env(safe-area-inset-bottom));
    box-shadow: 0 -8px 30px rgba(0,0,0,.28);
    overscroll-behavior: contain;
    transform: translateY(105%);
    visibility: hidden;
    transition: transform .3s cubic-bezier(.32,.72,.24,1), visibility 0s .3s;
  }
  .filters.open {
    transform: translateY(0);
    visibility: visible;
    transition: transform .3s cubic-bezier(.32,.72,.24,1), visibility 0s 0s;
  }

  .filters-head { display: flex; }
  .filters-backdrop { display: block; }
  .filters-fab { display: inline-flex; }

  body.drawer-open { overflow: hidden; }

  footer { padding-bottom: calc(4.5rem + env(safe-area-inset-bottom)); }

  /* iOS Safari zooms into form fields with font-size < 16px */
  input[type=text], input[type=number], select { font-size: 16px; }

  /* comfier touch targets */
  .check, .facet-option { padding: .22rem 0; }
  button { padding: .6rem 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  .filters, .filters-backdrop { transition: none; }
}