* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; background: #f4f5fa; color: #333; }
.admin-bar {
  height: 56px; background: linear-gradient(135deg, #3a3f8f, #5b6cf0); color: #fff;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; position: sticky; top: 0; z-index: 10;
}
.admin-bar .brand { font-size: 17px; font-weight: 600; }
.admin-bar .bar-ops { display: flex; align-items: center; gap: 10px; }
.ghost-btn {
  background: rgba(255,255,255,.18); color: #fff; border: 1px solid rgba(255,255,255,.4);
  padding: 7px 14px; border-radius: 8px; cursor: pointer; font-size: 13px;
}
.ghost-btn:hover { background: rgba(255,255,255,.3); }
.logout-btn {
  background: rgba(255,255,255,.18); color: #fff; border: none;
  padding: 7px 14px; border-radius: 8px; cursor: pointer; font-size: 13px;
}
.logout-btn:hover { background: rgba(255,255,255,.3); }
.admin-main { max-width: 960px; margin: 0 auto; padding: 18px 16px 60px; }
.notice {
  background: #eef1ff; border: 1px solid #d9def9; color: #3a3f8f;
  padding: 12px 14px; border-radius: 10px; font-size: 13px; line-height: 1.6; margin-bottom: 16px;
}
.card { background: #fff; border-radius: 12px; padding: 18px; margin-bottom: 16px; box-shadow: 0 2px 10px rgba(0,0,0,.04); }
.card h3 { font-size: 15px; margin-bottom: 14px; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.form-grid label { display: flex; flex-direction: column; font-size: 13px; color: #666; gap: 6px; }
.form-grid input, .form-grid select { height: 38px; border: 1px solid #dfe1ef; border-radius: 8px; padding: 0 10px; font-size: 14px; }
.modules-box { margin-top: 14px; }
.mb-title { font-size: 13px; color: #666; margin-bottom: 8px; }
.mb-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 8px; }
.mb-item { display: flex; align-items: center; gap: 6px; font-size: 13px; background: #f7f8fc; padding: 6px 8px; border-radius: 8px; }
.form-actions { margin-top: 16px; display: flex; align-items: center; gap: 10px; }
.form-actions button { height: 38px; padding: 0 20px; border: none; border-radius: 8px; background: linear-gradient(135deg, #3a3f8f, #5b6cf0); color: #fff; cursor: pointer; font-size: 14px; }
.form-actions .ghost { background: #eee; color: #555; }
.form-msg { font-size: 13px; }
.user-list { display: flex; flex-direction: column; gap: 10px; }
.loading { color: #999; font-size: 14px; padding: 10px 0; }
.urow { display: flex; align-items: center; justify-content: space-between; gap: 12px; border: 1px solid #eee; border-radius: 10px; padding: 12px 14px; }
.u-name { font-weight: 600; font-size: 14px; }
.u-sub { font-size: 12px; color: #999; margin: 3px 0; }
.u-mod { font-size: 12px; color: #666; }
.u-tag { font-size: 11px; padding: 1px 7px; border-radius: 10px; margin-left: 4px; color: #fff; }
.tag-admin { background: #e34d4d; } .tag-instructor { background: #2e9e5b; } .tag-student { background: #5b6cf0; }
.tag-active { background: #2e9e5b; } .tag-pending { background: #e6a23c; } .tag-disabled { background: #999; }
.u-ops { display: flex; gap: 8px; flex-shrink: 0; }
.u-ops button { border: none; padding: 7px 12px; border-radius: 8px; cursor: pointer; font-size: 13px; }
.u-ops .edit { background: #eef1ff; color: #3a3f8f; }
.u-ops .del { background: #fdecec; color: #e34d4d; }
@media (max-width: 600px) { .urow { flex-direction: column; align-items: flex-start; } }