:root {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --text: #1f2523;
  --muted: #66706c;
  --border: #e2ddd3;
  --primary: #2f6f5e;
  --primary-dark: #245647;
  --accent: #c98b3a;
  --danger: #b3412f;
  --ok: #2f7a4a;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

h1 { font-size: 1.5rem; margin: 0 0 .5rem; }
h2 { font-size: 1.05rem; margin: 1.5rem 0 .75rem; color: var(--muted); font-weight: 600; }
a { color: var(--primary); }
code { font-size: .85em; background: #f0ece4; padding: 1px 5px; border-radius: 4px; }

.wrap { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }

.topbar { background: var(--surface); border-bottom: 1px solid var(--border); }
.topbar-inner { display: flex; align-items: center; gap: 20px; min-height: 60px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.2rem; color: var(--text); text-decoration: none; }
.brand-mark { width: 22px; height: 22px; border-radius: 5px; background: linear-gradient(90deg, var(--primary) 0 33%, var(--accent) 33% 66%, var(--primary) 66%); }
.nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
.nav a { padding: 6px 12px; border-radius: 8px; text-decoration: none; color: var(--text); }
.nav a.active { background: #e6efe9; color: var(--primary-dark); font-weight: 600; }
.badge { display: inline-block; min-width: 20px; padding: 0 6px; border-radius: 10px; background: var(--accent); color: #fff; font-size: .75rem; text-align: center; font-weight: 700; }
.user-box { display: flex; align-items: center; gap: 10px; margin-left: auto; }

main { flex: 1; padding-top: 24px; padding-bottom: 40px; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.login-card { max-width: 420px; margin: 40px auto; }
.form-card { max-width: 520px; }

form label { display: block; margin: 12px 0; font-weight: 500; }
input, select { font: inherit; }
form label input, form label select { display: block; width: 100%; margin-top: 4px; }
input[type=email], input[type=password], input[type=search], input[type=number], input:not([type]), select {
  padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; background: #fff;
}
.form-error { color: var(--danger); margin: 8px 0; }

.btn { font: inherit; border: 1px solid transparent; border-radius: 8px; padding: 8px 16px; cursor: pointer; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover:not(:disabled) { background: #efebe3; }
.btn-sm { padding: 4px 10px; font-size: .85rem; }
.btn-block { width: 100%; margin-top: 8px; }

.demo-accounts { margin-top: 20px; border-top: 1px solid var(--border); padding-top: 12px; }
.demo-accounts table { width: 100%; font-size: .85rem; border-collapse: collapse; }
.demo-accounts td { padding: 3px 4px; }

.page-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin: 12px 0; }
.filters input[type=search] { flex: 1 1 220px; }
.check { display: flex; align-items: center; gap: 6px; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.book { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; display: flex; flex-direction: column; gap: 6px; }
.book h3 { margin: 0; font-size: 1.05rem; }
.book .genre { align-self: flex-start; font-size: .75rem; padding: 1px 8px; border-radius: 10px; background: #eef3f0; color: var(--primary-dark); }
.book .stock { font-size: .85rem; }
.book .stock.none { color: var(--danger); }
.book .btn { margin-top: auto; }

.pager { display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 20px; }

.loan-list { display: flex; flex-direction: column; gap: 10px; }
.loan { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; display: flex; gap: 12px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.loan h3 { margin: 0 0 2px; font-size: 1rem; }
.loan .meta { font-size: .85rem; color: var(--muted); }
.loan .fee { font-weight: 600; }
.loan .fee.late { color: var(--danger); }
.empty { color: var(--muted); padding: 12px 0; }

.toast { position: fixed; top: 72px; left: 50%; transform: translateX(-50%); max-width: calc(100% - 32px); padding: 10px 18px; border-radius: 8px; color: #fff; background: var(--ok); box-shadow: 0 6px 20px rgba(0,0,0,.15); z-index: 10; }
.toast.error { background: var(--danger); }

.footer { background: var(--surface); border-top: 1px solid var(--border); padding: 12px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.clock { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.clock-form { display: flex; gap: 6px; align-items: center; }
.clock-form input { width: 70px; padding: 4px 8px; }
.footer-actions { display: flex; align-items: center; gap: 14px; }

@media (max-width: 560px) {
  .topbar-inner { gap: 8px; padding-top: 8px; padding-bottom: 8px; }
  .nav { order: 3; flex-basis: 100%; }
  .grid { grid-template-columns: 1fr; }
}