#app{height:100vh;overflow:hidden}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:14px;color:#303133;background-color:#f5f7fa}#app{height:100%}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:#f5f7fa}::-webkit-scrollbar-thumb{background:#dcdfe6;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#e4e7ed}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.full-width{width:100%}.full-height{height:100%}.layout{display:flex;height:100vh}.layout__sidebar{width:200px;background:#fff;border-right:1px solid #dcdfe6;transition:width .3s}.layout__sidebar--collapsed{width:64px}.layout__main{flex:1;display:flex;flex-direction:column;overflow:hidden}.layout__header{height:60px;background:#fff;border-bottom:1px solid #dcdfe6;display:flex;align-items:center;padding:0 24px}.layout__content{flex:1;padding:24px;overflow-y:auto}.page-card{background:#fff;border-radius:4px;box-shadow:0 2px 4px #0000001f,0 0 6px #0000000a;padding:24px;margin-bottom:24px;width:100%;box-sizing:border-box}.form-container{max-width:500px;margin:0 auto}.form-container .form-item{margin-bottom:24px}.search-bar{display:flex;gap:16px;margin-bottom:24px;flex-wrap:wrap}.search-bar .form-item{margin-bottom:0}.action-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.action-bar__left{display:flex;gap:16px}.action-bar__right{display:flex;gap:8px}.status-tag--active{color:#67c23a}.status-tag--inactive{color:#f56c6c}.empty-state{text-align:center;padding:32px 0;color:#909399}.empty-state .icon{font-size:48px;margin-bottom:16px}@media (max-width: 768px){.layout__sidebar{position:fixed;z-index:1000;height:100vh;transform:translate(-100%);transition:transform .3s}.layout__sidebar--mobile-open{transform:translate(0)}.layout__main{margin-left:0}.search-bar{flex-direction:column}.search-bar .form-item{width:100%}.action-bar{flex-direction:column;gap:16px}.action-bar__left,.action-bar__right{width:100%;justify-content:center}}.n-select-menu,.n-dropdown-menu,.n-popover{z-index:9999!important}.n-select-menu{max-height:240px!important;z-index:9999!important;overflow:hidden!important}.n-select-menu .n-base-select-option{line-height:1.6;padding:10px 12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.n-select-menu .n-scrollbar{max-height:240px!important}.n-select-menu .n-scrollbar .n-scrollbar-content{max-height:none!important;padding-bottom:4px!important}.n-card,.n-card .n-card__content,.n-form-item,.n-form-item .n-select{overflow:visible!important}.n-form-item .n-select .n-base-selection{min-width:120px;overflow:visible!important}.n-form-item .n-select .n-base-suffix .n-base-loading,.n-form-item .n-select .n-base-suffix .n-base-clear{z-index:1}.search-form .n-form-item{overflow:visible!important;position:relative}.search-form .n-form-item .n-select{overflow:visible!important;position:relative;z-index:10}.select-dropdown-menu{z-index:9999!important;box-shadow:0 4px 12px #0000001a!important;border-radius:6px!important}.select-dropdown-menu .n-base-select-option{padding:8px 12px!important;cursor:pointer!important}.select-dropdown-menu .n-base-select-option:hover{background-color:#f5f5f5!important}.teacher-select-menu,.teacher-select-menu .n-scrollbar{max-height:280px!important}.teacher-select-menu .n-base-select-option{padding:12px 16px!important;line-height:1.4!important;min-height:44px!important;display:flex!important;align-items:center!important}.teacher-select-menu .n-base-select-option:last-child{margin-bottom:4px!important}