/* ===== QT 影音庫（/qt-video/）— YouTube 風格 ===== */

.qtlib [hidden] { display: none !important; }

.qtlib__header { margin-bottom: 1rem; }
.qtlib__header .main__content { margin-bottom: .25rem; }

.qtlib__layout {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

/* 左側：書卷目錄 */
.qtlib__sidebar {
  flex: 0 0 210px;
  width: 210px;
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
  padding-right: .75rem;
  border-right: 1px solid #e5e5e5;
}
.qtlib__group { margin-bottom: 1rem; }
.qtlib__group-hd {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 1.1rem;
  font-weight: 700;
  color: #d32f2f;
  padding: .4rem .5rem;
}
.qtlib__gn { font-size: .72rem; font-weight: 400; color: inherit; opacity: .6; }
.qtlib__books { list-style: none; margin: 0; padding: 0; }

.qtlib__book {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: .5rem;
  margin: 0 0 1px;
  padding: .34rem .55rem;
  border: 0;
  border-radius: 7px;
  background: none;
  color: #0f0f0f;
  font: inherit;
  font-size: .9rem;
  text-align: left;
  cursor: pointer;
}
.qtlib__book:hover { background: #f2f2f2; }
.qtlib__book.is-active { background: #065fd4; color: #fff; }
.qtlib__book.is-active .qtlib__n,
.qtlib__book.is-active .qtlib__prog { color: #dbe9ff; }
.qtlib__book--all { font-size: 1.25rem; font-weight: 700; margin-bottom: .45rem; }
.qtlib__n { font-size: .75rem; color: #909090; white-space: nowrap; }
.qtlib__prog { color: #b5b5b5; }

/* 右側：影片區 */
.qtlib__content { flex: 1 1 auto; min-width: 0; }
.qtlib__toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1rem;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.qtlib__current { margin: 0; font-size: 1.15rem; }
.qtlib__search {
  min-width: 220px;
  flex: 0 1 320px;
  padding: .5rem .9rem;
  border: 1px solid #ccc;
  border-radius: 999px;
  font-size: .9rem;
}
.qtlib__search:focus { outline: 2px solid #065fd4; outline-offset: 1px; border-color: #065fd4; }

.qtlib__section { margin-bottom: 1.75rem; }
.qtlib__section-hd {
  display: flex;
  gap: .5rem;
  align-items: baseline;
  margin: 0 0 .65rem;
  padding-bottom: .35rem;
  border-bottom: 1px solid #ececec;
  font-size: 1rem;
}
.qtlib__section-hd small { color: #909090; font-weight: 400; }

.qtlib__cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 1.1rem .85rem;
}
.qtlib__card { display: flex; flex-direction: column; min-width: 0; }
.qtlib__thumb {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  border-radius: 12px;
  overflow: hidden;
  background: #000;
  aspect-ratio: 16 / 9;
  cursor: pointer;
}
.qtlib__thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .25s ease;
}
.qtlib__thumb:hover img { transform: scale(1.05); }
.qtlib__play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.1rem;
  color: #fff;
  text-shadow: 0 1px 8px rgba(0, 0, 0, .7);
  opacity: 0;
  transition: opacity .2s ease;
}
.qtlib__thumb:hover .qtlib__play,
.qtlib__thumb:focus-visible .qtlib__play { opacity: 1; }

.qtlib__info { padding: .5rem .15rem 0; }
.qtlib__cardtitle {
  display: block;
  font-size: .92rem;
  font-weight: 600;
  line-height: 1.35;
  color: #0f0f0f;
}
.qtlib__carddate { display: block; margin-top: .15rem; font-size: .78rem; color: #606060; }

.qtlib__empty { padding: 2.5rem 0; text-align: center; color: #909090; }

/* 播放燈箱 */
.qtlib__modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
/* modal 在 .qtlib 容器外，必須自己處理 [hidden]，否則 display:flex 會蓋掉它 */
.qtlib__modal[hidden] { display: none !important; }
.qtlib__modal-backdrop { position: absolute; inset: 0; background: rgba(0, 0, 0, .78); }
.qtlib__modal-body {
  position: relative;
  z-index: 1;
  width: min(960px, 94vw);
  background: #0f0f0f;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(0, 0, 0, .5);
}
.qtlib__player { aspect-ratio: 16 / 9; width: 100%; background: #000; }
.qtlib__player iframe { display: block; width: 100%; height: 100%; border: 0; }
.qtlib__modal-title { padding: .7rem 1rem; color: #fff; font-size: .95rem; background: #0f0f0f; }
.qtlib__modal-close {
  position: absolute;
  top: .5rem;
  right: .5rem;
  z-index: 2;
  width: 2rem;
  height: 2rem;
  border: 0;
  border-radius: 50%;
  background: rgba(0, 0, 0, .55);
  color: #fff;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}
.qtlib__modal-close:hover { background: rgba(0, 0, 0, .8); }

@media (max-width: 900px) {
  .qtlib__layout { flex-direction: column; }
  .qtlib__sidebar {
    position: static;
    width: 100%;
    flex: none;
    max-height: none;
    padding: 0 0 .6rem;
    border-right: 0;
    border-bottom: 1px solid #e5e5e5;
  }
  .qtlib__books { display: flex; flex-wrap: wrap; gap: .25rem; }
  .qtlib__book { width: auto; }
  .qtlib__cards { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}