:root {
  --bg: #f6f3ee;
  --panel: #ffffff;
  --ink: #26221d;
  --muted: #6d655b;
  --line: #e2dcd1;
  --accent: #2f6f6a;
  --accent-ink: #ffffff;
  --warn: #b4572f;
  --warn-bg: #f7e6dd;
  --ok: #2f6f45;
  --ok-bg: #e0efe5;
  --info-bg: #e3edec;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1916;
    --panel: #25221e;
    --ink: #ece6dc;
    --muted: #a39a8d;
    --line: #3a3630;
    --accent: #5fb0a8;
    --accent-ink: #12211f;
    --warn: #e08a63;
    --warn-bg: #3d2a21;
    --ok: #7cc795;
    --ok-bg: #1f3427;
    --info-bg: #223432;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
}
h1, h2, h3 { margin: 0; font-weight: 650; }
h1 { font-size: 22px; }
h2 { font-size: 17px; }
a { color: var(--accent); }
.bk-muted { color: var(--muted); }
.bk-small { font-size: 13px; }
.bk-right { text-align: right; }
.bk-num { font-variant-numeric: tabular-nums; white-space: nowrap; }

.bk-top {
  display: flex; align-items: center; gap: 20px; padding: 10px 24px;
  background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5;
}
.bk-brand { font-weight: 700; font-size: 17px; letter-spacing: .2px; }
.bk-nav { display: flex; gap: 4px; flex: 1; }
.bk-nav a {
  padding: 6px 12px; border-radius: 999px; text-decoration: none; color: var(--muted); font-weight: 550;
}
.bk-nav a:hover { color: var(--ink); background: var(--bg); }
.bk-nav a[aria-current="page"] { background: var(--info-bg); color: var(--accent); }
.bk-main { max-width: 1100px; margin: 0 auto; padding: 24px; }
.bk-head { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.bk-head h1 { flex: 1; }

.bk-btn {
  font: inherit; font-weight: 600; font-size: 13px; cursor: pointer;
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  padding: 5px 13px; border-radius: 999px; display: inline-flex; gap: 6px; align-items: center;
}
.bk-btn:hover { border-color: var(--accent); color: var(--accent); }
.bk-btn.bk-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.bk-btn.bk-primary:hover { filter: brightness(1.08); color: var(--accent-ink); }
.bk-btn.bk-danger { color: var(--warn); }
.bk-btn.bk-danger:hover { border-color: var(--warn); color: var(--warn); }
.bk-btn:disabled { opacity: .5; cursor: default; }

input, select, textarea {
  font: inherit; color: var(--ink); background: var(--panel);
  border: 1px solid var(--line); border-radius: 8px; padding: 7px 10px; width: 100%;
}
input:focus, select:focus, textarea:focus, .bk-btn:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}
textarea { min-height: 70px; resize: vertical; }
.bk-search { max-width: 260px; }
.bk-filter { width: auto; }

.bk-tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; margin-bottom: 20px; }
.bk-tile { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.bk-tile .bk-big { font-size: 28px; font-weight: 700; line-height: 1.1; margin-top: 4px; }
.bk-tile.bk-alert { border-color: var(--warn); }
.bk-tile.bk-alert .bk-big { color: var(--warn); }
.bk-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 800px) { .bk-cols { grid-template-columns: 1fr; } .bk-main { padding: 16px; } }

.bk-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
.bk-card > h2 { padding: 12px 16px; border-bottom: 1px solid var(--line); }
.bk-empty { padding: 28px 16px; text-align: center; color: var(--muted); }

table.bk-table { width: 100%; border-collapse: collapse; }
.bk-table th, .bk-table td { padding: 9px 14px; text-align: left; vertical-align: middle; border-bottom: 1px solid var(--line); }
.bk-table th { font-size: 12px; text-transform: uppercase; letter-spacing: .5px; color: var(--muted); font-weight: 600; }
.bk-table tr:last-child td { border-bottom: 0; }
.bk-table .bk-actions { text-align: right; white-space: nowrap; }
.bk-title { font-weight: 600; }
.bk-wrap { overflow-x: auto; }

.bk-badge { display: inline-block; padding: 1px 9px; border-radius: 999px; font-size: 12px; font-weight: 600; background: var(--info-bg); color: var(--accent); }
.bk-badge.bk-late { background: var(--warn-bg); color: var(--warn); }
.bk-badge.bk-good { background: var(--ok-bg); color: var(--ok); }
.bk-badge.bk-plain { background: var(--bg); color: var(--muted); }

.bk-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; padding: 16px; }
.bk-book { text-align: left; background: none; border: 0; padding: 0; font: inherit; color: inherit; cursor: pointer; }
.bk-cover {
  aspect-ratio: 2 / 3; border-radius: 6px; border: 1px solid var(--line); background: var(--info-bg);
  display: flex; align-items: center; justify-content: center; text-align: center; padding: 10px;
  font-weight: 650; overflow: hidden; width: 100%;
}
.bk-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.bk-book:hover .bk-cover { border-color: var(--accent); }
.bk-book .bk-title { margin-top: 6px; font-size: 14px; }

dialog {
  border: 1px solid var(--line); border-radius: 14px; background: var(--panel); color: var(--ink);
  padding: 0; width: min(640px, calc(100vw - 24px)); max-height: calc(100vh - 24px);
}
dialog::backdrop { background: rgb(0 0 0 / .45); }
.bk-form { display: flex; flex-direction: column; max-height: calc(100vh - 24px); }
.bk-form > header { padding: 14px 20px; border-bottom: 1px solid var(--line); }
.bk-form > .bk-body { padding: 16px 20px; overflow-y: auto; display: grid; grid-template-columns: 1fr 1fr; gap: 12px 14px; }
.bk-form > footer { padding: 12px 20px; border-top: 1px solid var(--line); display: flex; gap: 8px; align-items: center; }
.bk-form .bk-grow { flex: 1; }
.bk-field { display: flex; flex-direction: column; gap: 4px; }
.bk-field > span { font-size: 12.5px; font-weight: 600; color: var(--muted); }
.bk-field.bk-full { grid-column: 1 / -1; }
.bk-row { display: flex; gap: 8px; align-items: center; }
.bk-error { color: var(--warn); font-size: 13px; }
@media (max-width: 560px) { .bk-form > .bk-body { grid-template-columns: 1fr; } }

.bk-picker { max-height: 190px; overflow-y: auto; border: 1px solid var(--line); border-radius: 8px; padding: 4px 8px; }
.bk-picker label { display: flex; gap: 8px; align-items: baseline; padding: 4px 0; cursor: pointer; }
.bk-picker input { width: auto; }

.bk-login { max-width: 360px; margin: 12vh auto; padding: 0 16px; }
.bk-login .bk-card { padding: 22px; display: flex; flex-direction: column; gap: 12px; }
.bk-toast {
  position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: var(--bg); padding: 8px 16px; border-radius: 999px; font-size: 14px; z-index: 20;
}

.bk-body > .bk-full { grid-column: 1 / -1; }
input[type="checkbox"] { width: auto; }
dialog { width: min(760px, calc(100vw - 24px)); }
.bk-body td select { min-width: 190px; }