/* 教务 / 课件中心 / 教师端 */
.teacher-hero {
  background: linear-gradient(120deg, #059af0, #6a5cff);
  border-radius: 10px; color: #fff; padding: 26px 28px; margin-top: 22px;
  display: flex; justify-content: space-between; align-items: center; gap: 18px; flex-wrap: wrap;
}
.teacher-hero h1 { font-size: 24px; margin: 0 0 6px; }
.teacher-hero p { margin: 0; color: rgba(255, 255, 255, .85); font-size: 13px; }
.teacher-hero .stats { display: flex; gap: 26px; }
.teacher-hero .stats .n { font-size: 26px; font-weight: 700; line-height: 1.1; }
.teacher-hero .stats .l { font-size: 12px; color: rgba(255, 255, 255, .75); }

.teacher-layout { display: grid; grid-template-columns: 210px 1fr; gap: 20px; margin-top: 20px; align-items: start; }
.teacher-side { background: #fff; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; position: sticky; top: 16px; }
.teacher-side .who { padding: 18px; border-bottom: 1px solid var(--line-2); display: flex; gap: 10px; align-items: center; }
.teacher-side .who img { width: 42px; height: 42px; border-radius: 50%; }
.teacher-side .who b { font-size: 15px; display: block; }
.teacher-side .who span { font-size: 12px; color: var(--muted); }
.teacher-side nav a { display: flex; align-items: center; gap: 9px; padding: 12px 18px; font-size: 14px; color: var(--text-2); border-left: 3px solid transparent; }
.teacher-side nav a:hover { background: #f7fbff; color: var(--main); }
.teacher-side nav a.active { background: var(--main-light); color: var(--main); border-left-color: var(--main); font-weight: 600; }
.teacher-side nav .ic { width: 15px; height: 15px; }

.cw-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.cw-card { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 16px 18px; display: flex; flex-direction: column; gap: 8px; transition: .16s; }
.cw-card:hover { box-shadow: var(--shadow); border-color: #d8ecff; }
.cw-title { font-size: 15px; font-weight: 600; line-height: 1.5; }
.cw-meta { font-size: 12px; color: var(--muted); display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.cw-desc { font-size: 13px; color: var(--text-2); line-height: 1.75; min-height: 42px; }
.cw-acts { display: flex; gap: 8px; margin-top: auto; flex-wrap: wrap; }
.cw-cat { display: inline-block; padding: 1px 9px; border-radius: 10px; background: #eef8ff; color: var(--main); font-size: 12px; }
.cw-cat.cat-示例 { background: #e9fbf1; color: #0f9d6b; }
.cw-cat.cat-教案 { background: #fff6e6; color: #b7791f; }
.cw-cat.cat-素材 { background: #f3ecff; color: #7b3ff2; }
.cw-cat.cat-其他 { background: #f2f4f7; color: #667085; }

.class-card { display: flex; gap: 16px; align-items: center; padding: 16px 18px; border: 1px solid var(--line); border-radius: 8px; background: #fff; margin-bottom: 12px; }
.class-card .avatar-box { width: 46px; height: 46px; border-radius: 10px; background: var(--main-light); color: var(--main); display: grid; place-items: center; flex: none; }
.class-card .avatar-box .ic { width: 22px; height: 22px; }
.class-card .info { flex: 1; min-width: 0; }
.class-card .info b { font-size: 16px; }
.class-card .info .meta { font-size: 12px; color: var(--muted); margin-top: 3px; display: flex; gap: 12px; flex-wrap: wrap; }
.class-card .acts { display: flex; gap: 8px; flex-wrap: wrap; }

.student-table { width: 100%; border-collapse: collapse; }
.student-table th, .student-table td { padding: 10px 12px; border-bottom: 1px solid var(--line-2); font-size: 14px; text-align: left; }
.student-table th { background: #fafbfd; font-size: 13px; color: var(--text-2); }

.upload-box { border: 1px dashed #c9d9ea; border-radius: 10px; padding: 18px; background: #fafcff; }
.upload-box input[type=file] { font-size: 13px; }

@media (max-width: 980px) {
  .cw-grid { grid-template-columns: repeat(2, 1fr); }
  .teacher-layout { grid-template-columns: 1fr; }
  .teacher-side { position: static; }
}
@media (max-width: 640px) {
  .cw-grid { grid-template-columns: 1fr; }
  .teacher-hero .stats { gap: 18px; }
}