:root {
  --wine: #4a1220;
  --wine-deep: #1c0a10;
  --ink: #2a1a1c;
  --paper: #f7f1e8;
  --card: #fffdf9;
  --line: #e4d8c8;
  --muted: #7d6a62;
  --gold: #b98a3e;
  --gold-soft: #f1e3c7;
  --danger: #a3242e;
  --ok: #2f7a4b;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: "Noto Sans Bengali", "Hind Siliguri", system-ui, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  -webkit-user-select: none; user-select: none;
  -webkit-touch-callout: none;
}
input, button, select { font: inherit; }
input { -webkit-user-select: text; user-select: text; }
button { cursor: pointer; }
[hidden] { display: none !important; }

/* ---------- top bar ---------- */
.bar {
  background: linear-gradient(180deg, var(--wine), var(--wine-deep));
  color: #f6eee2;
  padding: 12px 18px;
  display: flex; align-items: center; gap: 12px;
}
.bar .brand { font-weight: 700; font-size: 1.05rem; letter-spacing: .2px; }
.bar .brand span { color: #d2a85c; font-family: Lora, Georgia, serif; }
.bar .grow { flex: 1; }
.bar .who { font-size: .85rem; color: #d9c8b4; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 40vw; }
.btn {
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  padding: 8px 14px; border-radius: 8px; font-size: .92rem;
}
.btn:hover { border-color: var(--gold); }
.btn.primary { background: var(--wine); color: #fff; border-color: var(--wine); }
.btn.primary:hover { background: #5c1729; }
.btn.ghost { background: transparent; color: #f6eee2; border-color: rgba(246,238,226,.35); }
.btn.danger { color: var(--danger); }
.btn:disabled { opacity: .5; cursor: default; }
.btn:focus-visible, input:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }

/* ---------- login ---------- */
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px;
  background: linear-gradient(180deg, var(--wine), var(--wine-deep)); }
.login {
  width: 100%; max-width: 380px; background: var(--card); border-radius: 14px;
  padding: 28px 26px; box-shadow: 0 20px 50px rgba(0,0,0,.35);
}
.login h1 { margin: 0 0 4px; font-size: 1.45rem; }
.login h1 span { font-family: Lora, Georgia, serif; color: var(--wine); }
.login p.lead { margin: 0 0 20px; color: var(--muted); font-size: .92rem; }
label { display: block; font-size: .88rem; margin: 14px 0 6px; color: #4b3a36; }
.field {
  width: 100%; padding: 11px 12px; border: 1px solid var(--line); border-radius: 8px;
  background: #fff; font-size: 1rem;
}
.login .btn.primary { width: 100%; margin-top: 20px; padding: 12px; font-size: 1rem; }
.msg { margin-top: 14px; padding: 10px 12px; border-radius: 8px; font-size: .9rem; }
.msg.err { background: #fbe9ea; color: var(--danger); }
.msg.info { background: var(--gold-soft); color: #6b4b16; }
.fine { margin-top: 18px; font-size: .78rem; color: var(--muted); }

/* ---------- library ---------- */
.lib { max-width: 980px; margin: 0 auto; padding: 26px 18px 60px; }
.lib h2 { margin: 0 0 4px; font-size: 1.3rem; }
.lib .hint { margin: 0 0 22px; color: var(--muted); font-size: .9rem; }
.shelf { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 22px; }
.book {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  overflow: hidden; text-align: left; padding: 0; display: flex; flex-direction: column;
}
.book img { width: 100%; aspect-ratio: 210/297; object-fit: cover; display: block; pointer-events: none; }
.book .meta { padding: 10px 12px 12px; border-top: 4px solid var(--c, var(--gold)); }
.book .t { font-weight: 700; font-family: Lora, Georgia, serif; }
.book .s { font-size: .8rem; color: var(--muted); }
.book .pg { font-size: .78rem; color: var(--gold); margin-top: 4px; }
.book.locked { opacity: .45; cursor: not-allowed; }
.book.locked .pg { color: var(--muted); }
.book:not(.locked):hover { border-color: var(--gold); transform: translateY(-2px); transition: transform .15s; }

/* ---------- reader ---------- */
.reader { background: #2b2326; min-height: 100vh; display: flex; flex-direction: column; }
.reader .bar { position: sticky; top: 0; z-index: 5; }
.stage { flex: 1; overflow: auto; padding: 14px 8px 90px; -webkit-overflow-scrolling: touch; }
.stage canvas {
  display: block; margin: 0 auto; background: #fff; box-shadow: 0 6px 30px rgba(0,0,0,.45);
  max-width: none; touch-action: pan-x pan-y pinch-zoom;
}
.loading { color: #d9c8b4; text-align: center; padding: 40px; }
.nav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 6;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px; background: rgba(28,10,16,.94); color: #f6eee2;
}
.nav .btn { background: #3a2a2e; color: #f6eee2; border-color: #5a4448; min-width: 44px; }
.nav input { width: 64px; text-align: center; padding: 7px; border-radius: 8px; border: 1px solid #5a4448; background: #1c1316; color: #fff; }
.nav .of { font-size: .9rem; color: #cbb8a6; }

/* ---------- admin ---------- */
.admin { max-width: 1100px; margin: 0 auto; padding: 22px 16px 60px; }
.help { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--gold); border-radius: 10px; padding: 14px 18px; margin-bottom: 18px; }
.help h3 { margin: 0 0 6px; font-size: 1rem; }
.help ol { margin: 6px 0 0; padding-left: 20px; }
.help li { margin: 3px 0; font-size: .9rem; }
.help code { background: #f3ece1; padding: 1px 6px; border-radius: 4px; font-size: .85rem; -webkit-user-select: all; user-select: all; }
.tools { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; flex-wrap: wrap; }
.tools .field { max-width: 320px; }
.tools .count { color: var(--muted); font-size: .9rem; }
.buyer {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 16px; margin-bottom: 12px;
  display: grid; grid-template-columns: 1.2fr 1fr 1.4fr auto; gap: 12px 18px; align-items: start;
}
.buyer.off { background: #f6ecec; }
.buyer .id { font-size: .8rem; color: var(--muted); word-break: break-all; }
.buyer .field { padding: 7px 9px; font-size: .92rem; margin-bottom: 6px; }
.buyer .books { display: flex; flex-wrap: wrap; gap: 6px 14px; }
.buyer .books label, .buyer .act label { margin: 0; display: flex; gap: 6px; align-items: center; font-size: .9rem; }
.buyer .dev { font-size: .82rem; margin-top: 8px; }
.buyer .dev b.on { color: var(--ok); }
.buyer .dev b.none { color: var(--muted); }
.buyer .side { display: flex; flex-direction: column; gap: 6px; min-width: 150px; }
.tag { display: inline-block; font-size: .72rem; padding: 1px 8px; border-radius: 99px; background: #fbe9ea; color: var(--danger); }
@media (max-width: 760px) {
  .buyer { grid-template-columns: 1fr; }
  .bar .who { display: none; }
}

/* ---------- no printing ---------- */
@media print {
  body * { display: none !important; }
  body::after { content: "এই বইটি প্রিন্ট করা যাবে না।"; display: block; padding: 40px; font-size: 20px; }
}