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576px){.auth-container{height:100%;min-height:100vh}.auth-right{padding:16px}.auth-card{padding:20px}.auth-title{font-size:22px}.auth-header{margin-bottom:12px}.auth-logo{width:45px;height:45px}.brand-name{font-size:48px}.role-tabs,.auth-subtitle{margin-bottom:16px}}.auth-card .ant-form-item{margin-bottom:16px}.auth-card .ant-form-item:last-child{margin-bottom:0}.otp-input-container{margin-bottom:24px}.otp-label{display:block;margin-bottom:12px;font-weight:500;color:var(--text-color)}.otp-inputs{display:flex;gap:12px;justify-content:center;align-items:center}.otp-input{transition:all .3s ease!important}.otp-input:focus{border-color:#1890ff!important;box-shadow:0 0 0 2px #1890ff33!important}.otp-input:hover{border-color:#40a9ff!important}@media (max-width: 768px){.otp-inputs{gap:8px}.otp-input{width:45px!important;height:45px!important;font-size:18px!important}}.submission-detail-container{padding:24px;background:#f0f2f5;min-height:100vh}.submission-header{margin-bottom:24px}.student-info-card{position:sticky;top:24px}.student-profile{text-align:center;padding:16px 0}.detail-section{margin-top:16px}.detail-item{margin-bottom:16px}.questions-container{padding:16px 0}.question-card{border-radius:8px}.question-header{display:flex;justify-content:space-between;align-items:center}.question-content{margin-top:16px}.choices-container{margin:16px 0}.choice-item{padding:12px!important;margin-bottom:8px;border-radius:4px;border:1px solid #d9d9d9;background:#fafafa;transition:all .3s}.choice-item.choice-wrong{background:#fff2f0;border-color:#ffccc7}.answer-feedback{padding:12px;background:#f6ffed;border-radius:4px;border:1px solid #b7eb8f}.pagination-controls{display:flex;justify-content:center;align-items:center}.activity-container{padding:16px 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h2{font-size:18px}.student-profile .ant-avatar{width:48px!important;height:48px!important}.detail-item{margin-bottom:12px}.question-card{margin-bottom:16px!important}.question-content .ant-typography{font-size:14px}.choice-item{padding:8px!important;font-size:14px}.answer-feedback{padding:8px;font-size:14px}.activity-container .ant-timeline-item{padding-bottom:16px}.activity-container .ant-timeline-item-content{font-size:14px}.student-info-card .ant-btn{white-space:normal!important;height:auto!important;padding:8px 12px!important;line-height:1.4!important}.student-info-card .ant-btn span{display:inline-block;word-break:break-word;text-align:center;width:100%}.student-info-card .ant-btn .anticon{vertical-align:middle;margin-right:4px}}body.dark-mode .submission-detail-container{background:#141414;color:#ffffffd9}body.dark-mode .choice-item.choice-wrong{background:#ff4d4f26;border-color:#ff4d4f80}body.dark-mode .answer-feedback{background:#52c41a26;border-color:#52c41a80;color:#ffffffd9}body.dark-mode .activity-summary{background:#1f1f1f!important;border:1px solid #434343;color:#ffffffd9}body.dark-mode .submission-detail-container .ant-card{background:#1f1f1f;border-color:#434343;color:#ffffffd9}body.dark-mode .submission-detail-container .ant-card-head{background:#1f1f1f;border-bottom-color:#434343;color:#ffffffd9}body.dark-mode .submission-detail-container .ant-card-head-title{color:#ffffffd9}body.dark-mode .submission-detail-container .ant-card-body{background:#1f1f1f;color:#ffffffd9}body.dark-mode .question-card{background:#1f1f1f!important;border-color:#434343!important}body.dark-mode .question-card .ant-card-body{background:#1f1f1f!important;color:#ffffffd9}body.dark-mode .submission-detail-container .ant-tabs{color:#ffffffd9}body.dark-mode .submission-detail-container .ant-tabs-tab{color:#ffffffa6}body.dark-mode .submission-detail-container .ant-tabs-tab-active 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.2s;min-width:140px;justify-content:center}.delete-btn:disabled{opacity:.6;cursor:not-allowed}.delete-btn svg{width:18px;height:18px;stroke-width:2.5}.delete-btn-cancel{background:#fff;color:#6366f1;border:2px solid #6366f1}.delete-btn-cancel:hover:not(:disabled){background:#f3f4f6;transform:translateY(-1px);box-shadow:0 4px 12px #6366f133}.delete-btn-confirm{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;box-shadow:0 4px 15px #ef444466}.delete-btn-confirm:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #ef444480}.delete-btn-confirm:active{transform:translateY(0)}body.dark-mode .delete-modal-content{background:#1f2937}body.dark-mode .delete-modal-header h2{color:#f3f4f6}body.dark-mode .delete-modal-body p{color:#9ca3af}body.dark-mode .delete-modal-body strong{color:#f3f4f6}body.dark-mode .delete-btn-cancel{background:#374151;color:#a78bfa;border-color:#a78bfa}body.dark-mode .delete-btn-cancel:hover:not(:disabled){background:#4b5563}@media (max-width: 768px){.delete-modal-content{width:95%;padding:1.5rem}.delete-modal-footer{flex-direction:column}.delete-btn{width:100%}.delete-illustration{height:120px}.bg-square{width:35px!important;height:35px!important}.person-head{width:24px;height:24px}.person-body{width:16px;height:30px;margin-left:11px}.person-arm{width:28px}.file-icon{width:20px;height:24px}.delete-trash-bin img{width:35px}}@media (max-width: 480px){.delete-modal-content{padding:1.2rem 1rem;max-width:340px}.delete-modal-header h2{font-size:1.25rem}.delete-modal-body p{font-size:.875rem}.delete-btn{padding:.65rem 1.2rem;font-size:.875rem;min-width:auto}.delete-btn 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.emoji{font-size:24px}.reaction-summary{display:flex;gap:4px;flex-wrap:wrap}.reaction-badge{display:inline-flex;align-items:center;gap:2px;background:#0000000d;padding:2px 8px;border-radius:12px;cursor:pointer;transition:background .2s}.reaction-badge:hover{background:#0000001a}.reaction-emoji{font-size:14px}.reaction-count{font-size:12px;color:#666}.react-btn{display:flex;align-items:center;gap:4px}.react-btn.reacted{color:#1890ff}.emoji-picker-popover .ant-popover-inner{padding:0;border-radius:24px}body.dark-mode .reaction-badge{background:#ffffff1a}body.dark-mode .reaction-badge:hover{background:#ffffff26}body.dark-mode .reaction-count{color:#ffffffa6}body.dark-mode .emoji-btn:hover{background:#ffffff26}.mention-dropdown{max-height:250px;overflow-y:auto;min-width:200px}.mention-loading{padding:16px;text-align:center}.mention-empty{padding:12px 16px;color:#999;text-align:center}.mention-item{display:flex;align-items:center;gap:10px;padding:8px 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float{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}.podium-rank-badge{position:absolute;bottom:-10px;width:28px;height:28px;border-radius:50%;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;border:2px solid white}.badge-1{background-color:#f7b500}.badge-2{background-color:#b0bec5}.badge-3{background-color:#cd7f32}.podium-info{text-align:center;margin-top:16px}.podium-name{font-weight:700;color:var(--text-color);font-size:16px;margin-bottom:4px;max-width:150px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.podium-score{font-weight:600;color:#52c41a;font-size:14px}.podium-box-stand{margin-top:12px;border-radius:8px 8px 0 0;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:20px;position:relative}.stand-1{width:100px;height:120px;background:linear-gradient(135deg,#fff7e6,#fff1b8);border:2px solid 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#F7B500;background-color:var(--highlight-bg-gold)}.list-rank-2{border:2px solid #B0BEC5;background-color:var(--highlight-bg-silver)}.list-rank-3{border:2px solid #CD7F32;background-color:var(--highlight-bg-bronze)}.rank-number{font-size:16px;font-weight:700;width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:#f5f5f5;color:#595959;margin-right:16px;border-radius:50%;background:linear-gradient(135deg,#f5f5f5,#e8e8e8);box-shadow:inset 0 2px 4px #0000000d}.list-rank-1 .rank-number,.list-rank-2 .rank-number,.list-rank-3 .rank-number{background:transparent;width:40px;height:40px}.student-info{flex:1;display:flex;align-items:center;gap:12px}.student-list-avatar{border:1px solid #f0f0f0}.student-details{display:flex;flex-direction:column}.student-name{font-weight:600;color:var(--text-color);font-size:14px}.student-code{font-size:12px;color:#8c8c8c}.score-info{text-align:right;min-width:80px}.score-val{font-weight:700;color:#52c41a;font-size:15px}.time-val{font-size:12px;color:#bfbfbf}.crown-icon-list{color:#f7b500;margin-left:auto;font-size:20px}.monitor-container{padding:24px}.monitor-container .ant-table-wrapper{overflow-x:auto}.monitor-container .ant-table{min-width:800px}@media (max-width: 768px){.monitor-container{padding:16px}.monitor-container .ant-table{min-width:1000px}.monitor-container .ant-space{flex-wrap:wrap}}.question-delete-modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0009;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;justify-content:center;align-items:center;z-index:1000;animation:fadeIn .2s ease-out}.question-delete-modal-content{background:#fff;padding:18px 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cubic-bezier(.16,1,.3,1);position:relative;overflow:hidden}.question-delete-illustration{margin-bottom:1.5rem;position:relative;height:140px;display:flex;align-items:center;justify-content:center}.delete-bg-squares{position:absolute;width:100%;height:100%;top:0;left:0;pointer-events:none}.bg-square{position:absolute;width:50px;height:50px;background:#f5f5f5;border-radius:4px;opacity:.5}.bg-square:nth-child(1){top:10%;left:5%;width:40px;height:40px}.bg-square:nth-child(2){top:15%;right:10%;width:35px;height:35px}.bg-square:nth-child(3){bottom:20%;left:8%;width:30px;height:30px}.bg-square:nth-child(4){bottom:15%;right:5%;width:45px;height:45px}.delete-person{position:absolute;left:30%;top:50%;transform:translateY(-50%);z-index:2}.person-head{width:28px;height:28px;background:#ffd4a3;border-radius:50%;position:relative;margin-left:8px}.person-body{width:18px;height:35px;background:#ff6b6b;border-radius:8px 8px 2px 2px;margin-top:2px;margin-left:13px}.person-arm{position:absolute;top:30px;left:28px;width:32px;height:5px;background:#ffd4a3;border-radius:10px;transform-origin:left center;transform:rotate(-25deg);animation:throwingArm 1.5s ease-in-out infinite}@keyframes throwingArm{0%,to{transform:rotate(-25deg)}50%{transform:rotate(-45deg)}}.delete-file-throw{position:absolute;left:48%;top:28%;z-index:3;animation:throwFile 1.5s ease-in-out infinite}.file-icon{width:24px;height:28px;background:#ff6b6b;border-radius:2px;position:relative}.file-icon:before{content:"";position:absolute;top:-6px;right:0;width:0;height:0;border-left:10px solid transparent;border-bottom:10px solid #ff6b6b}@keyframes throwFile{0%,to{transform:translate(0) rotate(0);opacity:1}50%{transform:translate(15px,8px) rotate(25deg);opacity:.8}}.delete-trash-bin{position:absolute;right:25%;bottom:25%;z-index:1}.delete-trash-bin img{width:40px;height:auto;display:block;filter:drop-shadow(0 4px 8px 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.share-modal{background:#202124;box-shadow:0 1px 3px #00000080,0 4px 8px 3px #00000059}body.dark-mode .share-modal.google-style .share-modal-header{background:#202124}body.dark-mode .share-modal.google-style .share-modal-header h3{color:#e8eaed}body.dark-mode .share-modal.google-style .share-modal-header .close-btn{color:#9aa0a6}body.dark-mode .share-modal.google-style .share-modal-header .close-btn:hover{background:#e8eaed14}body.dark-mode .share-modal-body{background:#202124}body.dark-mode .share-section-title{color:#e8eaed}body.dark-mode .share-input-wrapper .share-email-input{background:#303134;border-color:#5f6368;color:#e8eaed}body.dark-mode .share-input-wrapper .share-email-input::placeholder{color:#9aa0a6}body.dark-mode .share-input-wrapper .share-email-input:focus{border-color:#8ab4f8;box-shadow:0 0 0 2px #8ab4f833}body.dark-mode .share-input-actions .share-permission-select{background:#303134;border-color:#5f6368;color:#e8eaed}body.dark-mode .share-input-actions .share-add-btn{background:#8ab4f8;color:#202124}body.dark-mode .share-input-actions .share-add-btn:hover:not(:disabled){background:#aecbfa}body.dark-mode .share-modal.google-style .shared-user-item.owner{border-color:#5f6368}body.dark-mode .share-modal.google-style .shared-user-avatar{background:#8ab4f8;color:#202124}body.dark-mode .share-modal.google-style .shared-user-name{color:#e8eaed}body.dark-mode .share-modal.google-style .shared-user-email,body.dark-mode .owner-badge{color:#9aa0a6}body.dark-mode .permission-dropdown{color:#e8eaed;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239aa0a6' d='M3 4.5L6 7.5L9 4.5'/%3E%3C/svg%3E")}body.dark-mode .permission-dropdown:hover{background-color:#e8eaed14}body.dark-mode .share-modal.google-style .remove-share-btn{color:#9aa0a6}body.dark-mode .share-modal.google-style .remove-share-btn:hover{background:#e8eaed14;color:#e8eaed}body.dark-mode 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576px){.share-modal{width:100%;max-width:100%;height:100%;max-height:100%;border-radius:0}.share-input-group{flex-direction:column}.share-permission-select{width:100%}.action-btn{padding:.4rem;font-size:1rem}.action-btn-text{display:none}.save-btn{padding:.4rem .6rem}.save-btn .btn-text{display:none}.back-btn{padding:.4rem}.back-btn .btn-text{display:none}.mindmap-title-wrapper{max-width:120px;min-width:80px}.mindmap-title-display{font-size:.9rem;padding:.3rem .5rem}}.profile-page-container{max-width:1200px;margin:0 auto;padding:24px}.profile-hero-card{border-radius:20px;overflow:hidden;background:linear-gradient(135deg,#667eea,#764ba2);box-shadow:0 10px 40px #667eea4d;margin-bottom:24px;border:none}.profile-hero-card .ant-card-body{padding:48px 40px}.profile-hero-content{display:flex;align-items:center;gap:40px;flex-wrap:wrap}.profile-avatar-section{flex-shrink:0}.avatar-wrapper{position:relative;display:inline-block}.profile-main-avatar{border:5px solid 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#00000026}.avatar-uploading-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:#0009;display:flex;align-items:center;justify-content:center;border-radius:50%}.modal-avatar-actions{display:flex;flex-direction:column;align-items:center;gap:12px;width:100%;max-width:280px}.upload-hint{font-size:12px;text-align:center;display:block;color:#8c8c8c}.edit-profile-modal .ant-form-item-label>label{font-weight:600;font-size:14px}.edit-profile-modal .ant-input{border-radius:8px}@media (max-width: 992px){.profile-hero-content{gap:32px}.profile-info-section{min-width:auto}.profile-action-section,.edit-profile-btn{width:100%}}@media (max-width: 768px){.profile-page-container{padding:16px}.profile-hero-card .ant-card-body{padding:32px 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