/* 📚 资料库 · 页面样式
   只作用于 .lb-* 命名空间，避免影响门户其它页面。

   ⚠️ 与「班级信息」同一条铁律：白底容器必须显式写 color。
   style.css 的 body 是浅色文字（配深色背景用的），
   只设 background:#fff 会让里面的字几乎看不见（实测对比度 1.27:1）。 */

.lb-wrap { max-width: 960px; margin: 0 auto; }

.lb-card {
  background: #fff;
  color: #1f2937;
  border: 1px solid #e6e8ee;
  border-radius: 12px;
  padding: 16px 18px;
  margin: 14px 0;
}

.lb-muted { color: #4b5563; font-size: 13px; }

.lb-hint {
  background: #fff8e6;
  border: 1px solid #f2d999;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 13px;
  margin: 10px 0;
  color: #1f2937;
}

.lb-err {
  background: #fdecec;
  border: 1px solid #f3b7b7;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 13px;
  color: #a12626;
  margin: 10px 0;
}

.lb-ok {
  background: #eaf8ef;
  border: 1px solid #a9dfbc;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 13px;
  color: #1d6b3a;
  margin: 10px 0;
}

.lb-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

.lb-input, .lb-select, .lb-textarea {
  width: 100%;
  box-sizing: border-box;
  border: 1px solid #d5d9e2;
  border-radius: 8px;
  padding: 9px 11px;
  font: inherit;
  background: #fff;
  color: #1f2937;
}

.lb-textarea { min-height: 90px; resize: vertical; line-height: 1.6; }

.lb-field { margin: 10px 0; }
.lb-field > label { display: block; font-size: 13px; color: #43506b; margin-bottom: 4px; }

.lb-grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.lb-grid3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }

.lb-btn {
  border: 1px solid #2f6fd0;
  background: #2f6fd0;
  color: #fff;
  border-radius: 8px;
  padding: 8px 16px;
  font: inherit;
  cursor: pointer;
}

.lb-btn:hover { background: #275ead; }
.lb-btn:disabled { opacity: .55; cursor: not-allowed; }

.lb-btn-ghost { background: #fff; color: #2f6fd0; }
.lb-btn-ghost:hover { background: #f0f5fd; }

.lb-btn-danger { background: #c0392b; border-color: #c0392b; }
.lb-btn-danger:hover { background: #a3352a; }

.lb-btn-ok { background: #1d8b4a; border-color: #1d8b4a; }
.lb-btn-ok:hover { background: #166b39; }

.lb-tabs { display: flex; gap: 6px; margin: 16px 0 6px; flex-wrap: wrap; }

.lb-tab {
  border: 1px solid #d5d9e2;
  background: #f7f8fb;
  border-radius: 999px;
  padding: 6px 15px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  color: #1f2937;
}

.lb-tab[aria-selected="true"] {
  background: #2f6fd0;
  border-color: #2f6fd0;
  color: #fff;
}

.lb-section-title {
  font-size: 15px;
  font-weight: 600;
  margin: 18px 0 8px;
  padding-left: 9px;
  border-left: 4px solid #2f6fd0;
}

.lb-filters {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 8px;
  margin: 10px 0;
}

.lb-item {
  border: 1px solid #e6e8ee;
  border-radius: 10px;
  padding: 12px 14px;
  margin: 9px 0;
  cursor: pointer;
  background: #fff;
  color: #1f2937;
  transition: border-color .15s;
}

.lb-item:hover { border-color: #9dbdf0; }
.lb-item h4 { margin: 0 0 5px; font-size: 15px; line-height: 1.45; }
.lb-item .lb-meta { font-size: 12.5px; color: #4b5563; margin-top: 6px; }

.lb-badge {
  display: inline-block;
  font-size: 12px;
  border-radius: 999px;
  padding: 1px 9px;
  margin-right: 6px;
  background: #eef2f9;
  color: #43506b;
}

.lb-badge-course { background: #e8f4fd; color: #1c5f97; }
.lb-badge-type { background: #f1ecfd; color: #5b3fa8; }
.lb-badge-pending { background: #fdf1e0; color: #8a5a09; }
.lb-badge-file { background: #eaf8ef; color: #1d6b3a; }

.lb-empty { color: #4b5563; font-size: 14px; padding: 12px 0; }

.lb-modal {
  position: fixed;
  inset: 0;
  background: rgba(20, 24, 33, .5);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
  overflow: auto;
  z-index: 60;
}

.lb-modal-body {
  background: #fff;
  color: #1f2937;   /* 白底必须自带深色文字 */
  border-radius: 12px;
  max-width: 760px;
  width: 100%;
  padding: 22px 24px;
}

.lb-kv { font-size: 14px; margin: 6px 0; color: #1f2937; }
.lb-kv b { color: #43506b; font-weight: 600; }

.lb-file {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid #e6e8ee;
  border-radius: 8px;
  padding: 9px 12px;
  margin: 8px 0;
  background: #fbfcfe;
  font-size: 14px;
  color: #1f2937;
  flex-wrap: wrap;
}

.lb-hidden { display: none !important; }

/* 审核台批量勾选：给足点击面积，手机上也能点得中 */
.lb-check {
  width: 20px;
  height: 20px;
  margin: 3px 0 0;
  flex: none;
  cursor: pointer;
  accent-color: #2f6fd0;
}

#lb-file {
  min-height: 40px;
  padding: 8px 10px;
  border: 1px dashed #c9cfdb;
  border-radius: 8px;
  background: #fbfcfe;
  box-sizing: border-box;
  width: 100%;
  color: #1f2937;
}

@media (max-width: 720px) {
  .lb-grid2, .lb-grid3 { grid-template-columns: 1fr; }
  .lb-filters { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .lb-btn { min-height: 40px; padding: 9px 14px; }
  .lb-tab { min-height: 38px; padding: 8px 14px; }
}