:root {
  --bg: #f5f3ee;
  --paper: #ffffff;
  --ink: #2a2520;
  --ink-2: #6b6358;
  --line: #e5dfd2;
  --accent: #2f5e3e;          /* library green */
  --accent-soft: #dce8df;
  --warm: #f9e8c1;
  --danger: #993939;
  --max: 1200px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 15.5px/1.55 "Inter", "Segoe UI", system-ui, sans-serif;
  min-height: 100vh;
}
h1, h2, h3 { font-family: "Lora", "Georgia", serif; margin: 0 0 .4em; }
h1 { font-size: 1.85rem; }
h2 { font-size: 1.3rem; margin-top: 1.4em; }
h3 { font-size: 1.05rem; color: var(--accent); }
a { color: var(--accent); }
button { font: inherit; cursor: pointer; padding: .5rem 1rem; border: 1px solid var(--line); background: var(--paper); border-radius: 6px; }
button:hover { background: var(--accent-soft); border-color: var(--accent); }
button.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
button.primary:hover { background: #234731; }
button.danger { color: var(--danger); border-color: #f0c0c0; }
button.danger:hover { background: #fde0e0; }

/* ============ TOPBAR ============ */
#topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 1.5rem;
  padding: .9rem 1.6rem;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: .55rem; font-weight: 600; color: var(--ink); text-decoration: none; font-family: "Lora", serif; font-size: 1.2rem; }
.logo { font-size: 1.4rem; }
#topbar nav { display: flex; gap: 1.3rem; margin-left: 1rem; }
#topbar nav a { color: var(--ink-2); padding: .2rem 0; border-bottom: 2px solid transparent; text-decoration: none; }
#topbar nav a.active { color: var(--ink); border-color: var(--accent); }
#topbar nav a:hover { color: var(--ink); }
.auth-box { margin-left: auto; display: flex; align-items: center; gap: .6rem; }
#who { font-size: .85rem; color: var(--ink-2); }

/* ============ VIEWS ============ */
.view { display: none; max-width: var(--max); margin: 0 auto; padding: 2rem 2rem 3rem; }
.view.active { display: block; }

/* ============ CATALOGUE ============ */
.catalog-hero { text-align: center; margin-bottom: 2rem; }
.catalog-hero .lede { color: var(--ink-2); }
.filters {
  display: flex; gap: .6rem; margin-bottom: 1.4rem; flex-wrap: wrap; align-items: center;
  background: var(--paper); padding: .8rem 1rem; border: 1px solid var(--line); border-radius: 8px;
}
.filters input, .filters select {
  font: inherit; padding: .45rem .7rem; border: 1px solid var(--line); border-radius: 6px; background: #fff;
}
.filters input[type="search"] { flex: 1; min-width: 240px; }
.filters .count { color: var(--ink-2); font-size: .85rem; margin-left: auto; }

.book-grid {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
.book-card {
  background: var(--paper); border: 1px solid var(--line); border-radius: 8px;
  padding: 1rem; cursor: pointer; transition: transform .12s ease, box-shadow .12s ease;
  display: flex; flex-direction: column;
}
.book-card:hover { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(40,40,30,.08); }
.book-card .cover {
  height: 180px; border-radius: 6px;
  background: linear-gradient(135deg, var(--accent) 0%, #4a8a5e 100%);
  display: flex; align-items: center; justify-content: center;
  color: var(--paper); padding: 1rem;
  font-family: "Lora", serif; text-align: center; font-size: 1rem;
  margin-bottom: .8rem;
}
.book-card.color-1 .cover { background: linear-gradient(135deg, #2f5e3e, #4a8a5e); }
.book-card.color-2 .cover { background: linear-gradient(135deg, #6b3e2e, #9d5e3e); }
.book-card.color-3 .cover { background: linear-gradient(135deg, #2e4a6b, #4e6e9d); }
.book-card.color-4 .cover { background: linear-gradient(135deg, #5e2f5e, #8a4a8a); }
.book-card.color-5 .cover { background: linear-gradient(135deg, #6b5e2e, #9d8e4e); }
.book-card h4 { margin: 0 0 .2rem; font-family: "Lora", serif; font-size: 1rem; line-height: 1.3; }
.book-card .sub { color: var(--ink-2); font-size: .85rem; margin-bottom: .5rem; flex: 1; }
.book-card .footer-row { display: flex; justify-content: space-between; align-items: center; }
.tag { display: inline-block; font-size: .72rem; padding: .12rem .55rem; border-radius: 999px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.tag.available { background: #dce8df; color: #2f5e3e; }
.tag.loaned    { background: #ffd9d9; color: #993939; }
.tag.partial   { background: var(--warm); color: #8a6a00; }

/* ============ ABOUT ============ */
.demo { width: 100%; border-collapse: collapse; margin: .8rem 0 1.6rem; background: var(--paper); border-radius: 6px; overflow: hidden; border: 1px solid var(--line); }
.demo th, .demo td { text-align: left; padding: .55rem .8rem; border-bottom: 1px solid var(--line); font-size: .92rem; }
.demo th { background: var(--accent-soft); }

/* ============ DASHBOARD ============ */
#dash-header { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; align-items: baseline; margin-bottom: 1.5rem; }
.dash-tabs { display: flex; gap: .4rem; flex-wrap: wrap; }
.dash-tabs button { padding: .4rem .9rem; border-radius: 6px; }
.dash-tabs button.active { background: var(--ink); color: #fff; border-color: var(--ink); }

.section-card { background: var(--paper); border: 1px solid var(--line); padding: 1.2rem 1.4rem; border-radius: 8px; margin-bottom: 1rem; }
.section-card h3 { margin-top: 0; }

.kpi-grid { display: grid; gap: .9rem; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); margin-bottom: 1rem; }
.kpi { background: var(--accent-soft); padding: 1rem 1.2rem; border-radius: 8px; }
.kpi .label { font-size: .78rem; color: var(--ink-2); text-transform: uppercase; letter-spacing: .05em; }
.kpi .value { font-size: 1.7rem; font-family: "Lora", serif; color: var(--accent); }

table.data { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.data th, table.data td { padding: .55rem .7rem; border-bottom: 1px solid var(--line); text-align: left; }
table.data th { background: var(--accent-soft); position: sticky; top: 0; }
table.data tbody tr:hover { background: #faf6ee; }
.row-actions { display: flex; gap: .25rem; flex-wrap: wrap; }
.row-actions button { font-size: .8rem; padding: .25rem .65rem; }

.toolbar { display: flex; gap: .5rem; margin-bottom: .9rem; flex-wrap: wrap; align-items: center; }
.toolbar input { font: inherit; padding: .45rem .6rem; border: 1px solid var(--line); border-radius: 6px; }
.toolbar .spacer { flex: 1; }

.overdue { color: var(--danger); font-weight: 600; }
.fine-paid { text-decoration: line-through; color: var(--ink-2); }

.bar-chart { display: flex; flex-direction: column; gap: .35rem; margin-top: .6rem; }
.bar-row { display: grid; grid-template-columns: 140px 1fr 40px; gap: .6rem; align-items: center; font-size: .85rem; }
.bar-bg { background: var(--accent-soft); height: 12px; border-radius: 999px; overflow: hidden; }
.bar-fill { background: var(--accent); height: 100%; }

/* ============ MODAL ============ */
#modal-root { position: fixed; inset: 0; z-index: 100; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(20,18,14,.55); backdrop-filter: blur(2px); }
.modal { position: relative; max-width: 640px; margin: 6vh auto; background: var(--paper); border-radius: 10px; border: 1px solid var(--line); max-height: 88vh; display: flex; flex-direction: column; overflow: hidden; box-shadow: 0 20px 50px rgba(0,0,0,.25); }
#modal-close { position: absolute; top: .5rem; right: .6rem; background: var(--paper); width: 32px; height: 32px; border-radius: 999px; padding: 0; font-size: 1.2rem; line-height: 1; border: 1px solid var(--line); }
#modal-body { padding: 1.6rem 1.8rem; overflow: auto; }

.form-grid { display: grid; gap: .7rem 1rem; grid-template-columns: 1fr 1fr; }
.form-grid label { display: flex; flex-direction: column; gap: .25rem; font-size: .85rem; color: var(--ink-2); }
.form-grid label.full { grid-column: 1 / -1; }
.form-grid input, .form-grid select, .form-grid textarea { font: inherit; padding: .5rem .65rem; border: 1px solid var(--line); border-radius: 6px; background: #fff; }
.form-actions { display: flex; justify-content: flex-end; gap: .5rem; margin-top: 1.2rem; }

.book-detail { display: grid; grid-template-columns: 180px 1fr; gap: 1.2rem; align-items: start; }
.book-detail .cover { height: 240px; border-radius: 8px; background: linear-gradient(135deg, var(--accent), #4a8a5e); color: #fff; display: flex; align-items: center; justify-content: center; padding: 1rem; font-family: "Lora", serif; text-align: center; }
.book-detail dl { display: grid; grid-template-columns: 90px 1fr; gap: .25rem .7rem; margin: 0; font-size: .9rem; }
.book-detail dt { color: var(--ink-2); }
.book-detail dd { margin: 0; }
.book-detail .actions { margin-top: 1.2rem; display: flex; gap: .5rem; }

/* ============ TOAST ============ */
#toast-root { position: fixed; right: 1rem; bottom: 1rem; display: flex; flex-direction: column; gap: .5rem; z-index: 200; }
.toast { background: var(--ink); color: #fff; padding: .65rem .9rem; border-radius: 6px; font-size: .9rem; max-width: 320px; box-shadow: 0 8px 20px rgba(0,0,0,.2); }
.toast.success { background: var(--accent); }
.toast.error { background: var(--danger); }

/* ============ FOOTER ============ */
footer { text-align: center; padding: 2rem; color: var(--ink-2); font-size: .85rem; border-top: 1px solid var(--line); margin-top: 2rem; }

/* ============ RESPONSIVE ============ */
@media (max-width: 700px) {
  .form-grid { grid-template-columns: 1fr; }
  .book-detail { grid-template-columns: 1fr; }
  #topbar { flex-wrap: wrap; gap: .8rem; }
  #topbar nav { order: 3; width: 100%; overflow-x: auto; }
  .filters input[type="search"] { min-width: 100%; }
}