:root {
  --ink: #17212b;
  --muted: #374151;
  --navy: #123b5d;
  --navy-dark: #0b2942;
  --page: #f3f6f8;
  --surface: #ffffff;
  --line: #aab8c4;
  --error: #861b1b;
  --success: #14532d;
  --warning-bg: #fff2cf;
  --warning-ink: #382600;
}

* { box-sizing: border-box; }
html { font-size: 100%; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--page);
  font: 1rem/1.55 "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
}
[hidden] { display: none !important; }
a { color: var(--navy); }
h1, h2, h3 { line-height: 1.25; }
h2 { margin: 0 0 .75rem; font-size: 1.65rem; }
h3 { margin: 1.5rem 0 .75rem; font-size: 1.25rem; }

.skip-link {
  position: absolute;
  z-index: 100;
  top: -5rem;
  left: .75rem;
  padding: .75rem 1rem;
  color: var(--navy-dark);
  background: #fff;
  border: 2px solid var(--navy-dark);
  font-weight: 700;
}
.skip-link:focus { top: .75rem; }
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
:focus-visible {
  outline: 3px solid #ffdd00;
  outline-offset: 2px;
  box-shadow: 0 0 0 5px #0b1f33;
}

.site-header { color: #fff; background: var(--navy-dark); }
.header-inner, .main-nav ul, main, .site-footer p {
  width: min(100% - 2rem, 74rem);
  margin-inline: auto;
}
.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .75rem 1rem;
  padding-block: .9rem;
}
.site-title { margin: 0; font-size: 1.4rem; }
.staff-info { display: flex; align-items: center; flex-wrap: wrap; gap: .75rem; }
.main-nav { background: #e2eaf1; border-bottom: 3px solid var(--navy); }
.main-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem;
  list-style: none;
  padding: .4rem 0;
  margin-block: 0;
}
.main-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: .35rem .9rem;
  border-radius: .35rem;
  font-weight: 700;
  text-decoration: underline;
  color: var(--navy-dark);
}
.main-nav a[aria-current="page"] {
  color: #fff;
  background: var(--navy);
  text-decoration: none;
}
main { min-height: 62vh; padding-block: 1rem 2rem; }
.site-footer { background: #e5ebf0; border-top: 2px solid var(--line); }
.site-footer p { margin-block: 0; padding-block: 1rem; color: var(--muted); }

.panel, .stat {
  background: var(--surface);
  border: 2px solid var(--line);
  border-radius: .55rem;
  padding: 1rem 1.2rem;
}
.panel { margin-bottom: 1.25rem; }
.panel h3 { margin-top: 0; }
.sign-in-panel { width: min(100%, 34rem); margin: 2rem auto; }
.notice {
  padding: .7rem .9rem;
  color: var(--warning-ink);
  background: var(--warning-bg);
  border: 2px solid var(--warning-ink);
  border-radius: .4rem;
}
.section-intro { margin-top: 0; }
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr));
  gap: 1rem;
  margin-block: 1rem;
}
.stat dt { font-weight: 700; }
.stat dd { margin: .4rem 0 0; }
.stat-number { color: var(--navy-dark); font-size: 2.1rem; font-weight: 800; line-height: 1.15; }
.stat-note { color: var(--muted); }

.form-field { min-width: 0; margin-bottom: 1rem; }
.form-grid, .toolbar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
  gap: 0 1rem;
  align-items: end;
}
label, legend { display: block; margin-bottom: .3rem; font-weight: 700; }
input[type="text"], input[type="password"], input[type="email"], input[type="tel"],
input[type="search"], input[type="date"], select, textarea {
  width: 100%;
  min-height: 2.8rem;
  padding: .5rem .65rem;
  color: var(--ink);
  background: #fff;
  border: 2px solid #4b5966;
  border-radius: .35rem;
  font: inherit;
}
textarea { min-height: 5.5rem; resize: vertical; }
fieldset {
  min-width: 0;
  margin: 0 0 1rem;
  padding: .65rem 1rem .4rem;
  border: 2px solid var(--line);
  border-radius: .4rem;
}
fieldset legend { padding-inline: .3rem; }
.choice-row { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; }
.choice { display: inline-flex; align-items: center; gap: .6rem; min-height: 2.75rem; cursor: pointer; }
.choice input { width: 1.35rem; height: 1.35rem; margin: 0; accent-color: var(--navy); }
.nested-field { margin: .75rem 0 .25rem; }
.hint { display: block; margin-top: .25rem; color: var(--muted); font-size: .94rem; }
.field-error { display: block; margin-top: .3rem; color: var(--error); font-weight: 700; }
.field-error:empty { display: none; }
[aria-invalid="true"] { border: 3px solid var(--error) !important; background: #fff7f7 !important; }
.button-row { display: flex; flex-wrap: wrap; gap: .75rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.8rem;
  min-height: 2.8rem;
  padding: .5rem .95rem;
  border: 2px solid var(--navy);
  border-radius: .4rem;
  font: inherit;
  font-weight: 700;
  text-align: center;
  cursor: pointer;
}
.button-primary { color: #fff; background: var(--navy); }
.button-primary:hover { background: var(--navy-dark); }
.button-secondary { color: var(--navy-dark); background: #fff; }
.button-secondary:hover { background: #e7eff6; }
.button-small { min-height: 2.6rem; padding-inline: .65rem; }
.button:disabled { color: #303943; background: #e0e4e8; border-color: #606b75; cursor: not-allowed; }
.toolbar { margin-block: .5rem .75rem; }
.toolbar .button { margin-bottom: 1rem; }

.message-area { position: sticky; top: 0; z-index: 5; padding-top: .35rem; }
.message { margin: 0; }
.message.has-content {
  margin-bottom: .65rem;
  padding: .7rem .9rem;
  border: 2px solid;
  border-radius: .4rem;
  font-weight: 700;
}
.message-info.has-content { color: #102f4e; background: #e6f0fa; border-color: #102f4e; }
.message-success.has-content { color: #104321; background: #e7f5e9; border-color: #104321; }
.message-error.has-content { color: #741414; background: #fff0f0; border-color: #741414; }
.count-text { margin-block: .6rem; font-weight: 700; }
.pagination { display: flex; align-items: center; flex-wrap: wrap; gap: .75rem 1rem; margin-block: 1rem; }

.table-wrap { width: 100%; }
.data-table { width: 100%; border-collapse: collapse; background: #fff; }
.data-table caption { padding: .4rem 0; color: var(--muted); text-align: left; font-weight: 700; }
.data-table th, .data-table td {
  padding: .65rem .6rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}
.data-table thead th { color: var(--navy-dark); background: #e2eaf1; border-bottom: 3px solid var(--navy); }
.data-table tbody th { font-weight: 700; }
.cell-note { display: block; margin-top: .15rem; color: var(--muted); font-size: .9rem; font-weight: 400; }
.badge {
  display: inline-block;
  padding: .12rem .55rem;
  border: 2px solid;
  border-radius: 1rem;
  font-size: .9rem;
  font-weight: 700;
}
.badge-available, .badge-paid { color: #104321; background: #e7f5e9; border-color: #104321; }
.badge-onloan, .badge-active { color: #102f4e; background: #e6f0fa; border-color: #102f4e; }
.badge-reference { color: #4b2d00; background: #fff2d7; border-color: #4b2d00; }
.badge-overdue, .badge-unpaid { color: #741414; background: #fff0f0; border-color: #741414; }
.badge-returned { color: #2e3740; background: #edf0f2; border-color: #2e3740; }

/* At narrower widths, each row becomes a labelled record card. */
@media (max-width: 62rem) {
  .data-table, .data-table thead, .data-table tbody, .data-table tr,
  .data-table th, .data-table td, .data-table caption { display: block; }
  .data-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }
  .data-table caption { margin-bottom: .4rem; }
  .data-table tr {
    margin-bottom: 1rem;
    padding: .55rem;
    border: 2px solid var(--line);
    border-radius: .5rem;
    background: #fff;
  }
  .data-table td, .data-table tbody th {
    display: grid;
    grid-template-columns: minmax(6.5rem, 9rem) minmax(0, 1fr);
    gap: .5rem;
    padding: .45rem .25rem;
    border: 0;
  }
  .data-table td::before, .data-table tbody th::before {
    content: attr(data-label);
    color: var(--navy-dark);
    font-weight: 700;
  }
}
@media (max-width: 34rem) {
  .header-inner, .main-nav ul, main, .site-footer p { width: min(100% - 1.25rem, 74rem); }
  .site-title { font-size: 1.2rem; }
  .main-nav a { padding-inline: .55rem; }
  .button-row .button { flex: 1 1 100%; }
  .pagination .button { flex: 1 1 auto; }
  .stat-number { font-size: 1.9rem; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}