/* Thư viện bộ bài. Trang tra cứu — dày chữ, dễ lướt, không hoạt ảnh cuộn. */

[hidden] { display: none !important; }

.trang-bo-bai .khoi-bb-dau { min-height: auto; padding: 4.5rem 1.5rem 1.5rem; }
.khung-bb { max-width: 60rem; margin: 0 auto; padding: 0 1.5rem 3rem; }

/* ── Bộ lọc ────────────────────────────────────────────────────────── */

.loc-bb {
  position: sticky; top: 0; z-index: 5;
  padding: 1rem 0 1.2rem; margin-bottom: 1.5rem;
  background: linear-gradient(var(--dem-sau) 70%, transparent);
}
.loc-bb input {
  width: 100%; max-width: 22rem; font: inherit; font-size: .95rem; color: var(--giay);
  background: rgba(8,11,20,.75); border: 1px solid rgba(216,180,92,.24);
  padding: .55rem .9rem; margin-bottom: .8rem;
}
.loc-bb input:focus { outline: none; border-color: var(--vang); }

.nut-chu-de { display: flex; flex-wrap: wrap; gap: .45rem; }
.nut-chu-de button {
  font: inherit; font-size: .84rem; cursor: pointer; padding: .38rem .85rem;
  color: var(--giay-chim); background: rgba(14,19,34,.7);
  border: 1px solid rgba(216,180,92,.18);
  transition: color .3s, border-color .3s, background .3s;
}
.nut-chu-de button:hover { color: var(--giay-mo); border-color: rgba(216,180,92,.45); }
.nut-chu-de button.dang {
  color: var(--vang); border-color: var(--vang); background: rgba(216,180,92,.1);
}

/* ── Thẻ lá ────────────────────────────────────────────────────────── */

.luoi-bb { display: flex; flex-direction: column; gap: 1.2rem; }
.the-bb {
  display: grid; grid-template-columns: 8.5rem 1fr; gap: 1.4rem;
  padding: 1.2rem 1.3rem; align-items: start;
  background: rgba(14,19,34,.55);
  border: 1px solid rgba(240,231,212,.08);
  /* scroll-margin: vào bằng neo #la-18 thì tiêu đề không bị thanh lọc dính che mất */
  scroll-margin-top: 7rem;
}
.the-bb > img {
  width: 100%; height: auto; border-radius: 3px;
  border: 1px solid rgba(216,180,92,.25);
  box-shadow: 0 12px 30px -16px #000;
}
.bb-chu h2 {
  margin: 0 0 .5rem; font-size: 1.25rem; font-weight: 500; color: var(--vang-sang);
}
.bb-chu h2 em {
  font-style: normal; font-size: .82rem; letter-spacing: .08em;
  color: var(--giay-chim); margin-left: .5rem;
}
.bb-cot-loi { margin: 0 0 1rem; font-size: 1rem; color: var(--giay); }

.bb-huong { margin-bottom: .9rem; padding-left: .9rem; border-left: 2px solid var(--vang-toi); }
.bb-nguoc { border-left-color: rgba(193,85,58,.55); }
.bb-nhan {
  display: block; font-size: .68rem; letter-spacing: .2em; text-transform: uppercase;
  color: var(--vang); margin-bottom: .25rem;
}
.bb-nguoc .bb-nhan { color: #E08A72; }
.bb-huong p { margin: 0; font-size: .95rem; line-height: 1.6; color: var(--giay-mo); }
.bb-tk { margin-top: .3rem !important; font-size: .82rem !important; color: var(--giay-chim) !important; }

.the-bb details { margin-top: .8rem; }
.the-bb summary {
  cursor: pointer; font-size: .84rem; color: var(--giay-chim); list-style: none;
  letter-spacing: .06em;
}
.the-bb summary::-webkit-details-marker { display: none; }
.the-bb summary::before { content: "+ "; color: var(--vang); }
.the-bb details[open] summary::before { content: "− "; }
.the-bb summary:hover { color: var(--giay-mo); }
.the-bb details ul {
  list-style: none; padding: 0; margin: .6rem 0 .6rem;
  display: flex; flex-wrap: wrap; gap: .35rem;
}
.the-bb details li {
  font-size: .82rem; color: var(--giay-mo); padding: .25rem .6rem;
  background: rgba(8,11,20,.55); border: 1px solid rgba(216,180,92,.15);
}
.bb-soi {
  margin: 0; font-style: italic; font-size: .92rem; color: var(--giay);
  padding-left: .9rem; border-left: 2px solid rgba(216,180,92,.4);
}

@media (max-width: 640px) {
  .the-bb { grid-template-columns: 1fr; gap: 1rem; }
  .the-bb > img { width: 7.5rem; }
}