/* =========================================================================
   faq.css — HOI DAP (dung <details>, khong can JS de mo/dong)

   js/faq.js chi lam mot viec: mo cai nay thi dong cai kia. Mat JS thi cac
   muc van bam mo duoc binh thuong.
   ========================================================================= */

.faq { display: grid; gap: 12px; }

.faq__item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.faq__item[open] { border-color: var(--accent); box-shadow: var(--sh-md); }

.faq__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 650;
  list-style: none;
  transition: background-color var(--dur-fast) var(--ease);
}
.faq__q::-webkit-details-marker { display: none; }
.faq__q:hover { background: var(--surface-2); }

/* Dau cong -> dau tru bang cach xoay mot vach. */
.faq__sign {
  position: relative;
  flex: none;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--accent-soft);
}
.faq__sign::before,
.faq__sign::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 10px; height: 2px;
  margin: -1px 0 0 -5px;
  background: var(--accent);
  border-radius: 2px;
  transition: transform var(--dur) var(--ease-spring);
}
.faq__sign::after { transform: rotate(90deg); }
.faq__item[open] .faq__sign::after { transform: rotate(0); }

/* Phan tra loi: chay grid-template-rows 0fr -> 1fr de "truot xuong" ma
   khong phai do chieu cao bang JS. */
.faq__a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .35s var(--ease-out);
}
.faq__item[open] .faq__a { grid-template-rows: 1fr; }
.faq__a > div { overflow: hidden; }
.faq__a p {
  padding: 0 22px 20px;
  margin: 0;
  color: var(--text-muted);
  font-size: var(--fs-sm);
}