:root {
  color-scheme: light;
  --bg: #f7f7f4;
  --ink: #1e2528;
  --muted: #536063;
  --line: #c9cfcb;
  --panel: #ffffff;
  --accent: #155f4c;
  --accent-ink: #ffffff;
  --focus: #9b5cff;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
.skip-link {
  position: absolute;
  left: 1rem;
  top: .5rem;
  z-index: 1000;
  transform: translateY(-150%);
  background: #ffffff;
  color: var(--ink);
  border: 2px solid var(--focus);
  border-radius: 6px;
  padding: .6rem .8rem;
}
.skip-link:focus {
  transform: translateY(0);
}
.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;
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: .8rem clamp(1rem, 4vw, 3rem);
  background: #21302d;
  color: white;
}
.topbar a { color: white; text-decoration: none; }
.brand { font-weight: 750; font-size: 1.1rem; }
.topbar nav { display: flex; gap: .9rem; align-items: center; }
.topbar form { margin: 0; }

main {
  width: min(1100px, calc(100% - 2rem));
  margin: 2rem auto;
}
.back-nav {
  margin: 0 0 1rem;
}
.back-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--accent);
  font-weight: 700;
}
.back-nav a::before {
  content: "<";
  margin-right: .45rem;
}

button, .primary, .download {
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-ink);
  padding: .65rem .9rem;
  text-decoration: none;
  cursor: pointer;
  font: inherit;
  white-space: nowrap;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

input, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: .75rem .85rem;
  font: inherit;
  background: white;
  min-height: 44px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
main:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.search form,
.compact-search {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .7rem;
}
.compact-search {
  margin: 1rem 0;
}
.search h1 {
  margin: 0 0 1rem;
  font-size: 1.8rem;
}
.page-heading {
  margin-bottom: 1.2rem;
}
.page-heading h1 {
  margin: .15rem 0 .3rem;
  font-size: 1.8rem;
}
.eyebrow {
  margin: 0;
  color: var(--accent);
  font-weight: 750;
}
.letter-nav {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 1rem 0 1.2rem;
}
.letter-nav a,
.browse-item {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
}
.letter-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  padding: .55rem .7rem;
}
.letter-nav a[aria-current="page"] {
  border-color: var(--accent);
  background: #e7f1ed;
  color: var(--accent);
  font-weight: 750;
}
.browse-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: .65rem;
}
.browse-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .8rem;
  padding: .75rem .85rem;
}
.browse-item:hover {
  border-color: var(--accent);
}
.count {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.book-list {
  display: grid;
  gap: .8rem;
  margin-top: 1.4rem;
}
.book-row, .panel, .auth-panel, .detail {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
}
.book-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: start;
}
.book-row h2 {
  margin: 0 0 .2rem;
  font-size: 1.1rem;
}
.book-row p, .detail p { margin: .45rem 0; }
.meta, .muted { color: var(--muted); }
.hint {
  margin: -.5rem 0 .2rem;
  color: var(--muted);
  font-size: .95rem;
}
.tags { color: #394541; font-weight: 600; }
.pager {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 1.2rem;
}
.auth-panel {
  max-width: 430px;
  margin: 4rem auto;
}
.stack {
  display: grid;
  gap: .85rem;
}
.error { color: #9c2525; font-weight: 650; }
.admin-grid {
  display: grid;
  gap: 1rem;
}
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  border-bottom: 1px solid var(--line);
  padding: .55rem;
  text-align: left;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
  }
}

@media (max-width: 700px) {
  .search form, .compact-search, .book-row {
    grid-template-columns: 1fr;
  }
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }
}