.dashboard-stats-page{padding:24px}.dashboard-stats-page h2{margin-bottom:24px}.overview-cards .ant-card{height:140px}.stat-footer{margin-top:8px;font-size:12px;color:#666}.chart-card{min-height:400px}.chart-card .ant-card-body{padding:16px}.ranking-card{min-height:400px}.empty-chart{display:flex;align-items:center;justify-content:center;height:300px;color:#999}.stats-card .ant-statistic-title{font-size:14px}.dashboard-loading{display:flex;justify-content:center;align-items:center;height:400px}*{margin:0;padding:0;box-sizing:border-box}.logo{height:64px;display:flex;align-items:center;justify-content:center;border-bottom:1px solid #f0f0f0}.logo h2{font-size:18px;color:#1890ff}.upload-cover .ant-upload{width:300px;height:170px}.upload-cover .ant-upload-select{width:100%!important;height:100%!important}.video-player-container{width:100%;background:#000;border-radius:8px;overflow:hidden}.video-player-container video{width:100%;max-height:500px}.chapter-list{margin-top:24px}.chapter-item{display:flex;align-items:center;padding:16px;border:1px solid #f0f0f0;border-radius:8px;margin-bottom:16px;background:#fafafa}.chapter-item:hover{background:#f0f0f0}.chapter-info{flex:1}.chapter-title{font-weight:700;margin-bottom:8px}.chapter-video{color:#666;font-size:14px}.drag-upload-area{border:2px dashed #d9d9d9;border-radius:8px;padding:40px;text-align:center;cursor:pointer;transition:border-color .3s}.drag-upload-area:hover{border-color:#1890ff}.drag-upload-area.dragover{border-color:#1890ff;background:#e6f7ff}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:#f4f7fb;padding:24px}.login-card{width:420px;max-width:100%;border-radius:8px;box-shadow:0 12px 40px #0f172a1f}.login-header{margin-bottom:24px;text-align:center}.login-header h1{margin-bottom:6px;font-size:24px;color:#1f2937}