:root{--primary-color: #4361ee;-primary-light:#a9c9ff;--background: #f8fbff;--secondary-color: #26d0ce;--accent-color: #ff6b6b;--light-color: #f8f9fa;--dark-color: #343a40;--success-color: #28a745;--warning-color: #ffc107;--danger-color: #dc3545;--info-color: #17a2b8;--border-radius-sm: .25rem;--border-radius-md: .5rem;--border-radius-lg: 1rem;--box-shadow-sm: 0 .125rem .25rem rgba(0, 0, 0, .075);--box-shadow: 0 .5rem 1rem rgba(0, 0, 0, .15);--box-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, .175)}body{font-family:Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:#f5f7fa;color:#333;margin:0;padding:0}.navbar{box-shadow:var(--box-shadow);background:linear-gradient(135deg,#ffffff,#f0f2f5);border-bottom:1px solid rgba(0,0,0,.05)}.navbar-brand{font-weight:700;color:var(--primary-color)!important;font-size:1.5rem}.nav-link{font-weight:500;transition:all .3s 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#e1e5eb;padding:.75rem 1rem}.form-select:focus{border-color:var(--primary-color);box-shadow:0 0 0 .2rem #3e9eff40}.modal-content{border-radius:var(--border-radius-lg);border:none;box-shadow:var(--box-shadow-lg)}.modal-header{background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-bottom:1px solid #e1e5eb;padding:1rem 1.5rem}.modal-title{font-weight:600;color:var(--dark-color)}.modal-footer{background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-top:1px solid #e1e5eb;padding:1rem 1.5rem}.alert{border-radius:var(--border-radius-md);border:none;font-weight:500;box-shadow:var(--box-shadow-sm)}.alert-warning{background:linear-gradient(135deg,#fff3cd,#ffeaa7);color:#856404}.alert-info{background:linear-gradient(135deg,#d1ecf1,#a8e6ff);color:#0c5460}.badge{border-radius:var(--border-radius-sm);font-weight:600;padding:.5em .75em}.badge-primary{background:linear-gradient(135deg,var(--primary-color),#2d7be6)}.pagination .page-link{border-radius:var(--border-radius-md);border:none;margin:0 .25rem;color:var(--primary-color);font-weight:500;transition:all .3s ease}.pagination .page-link:hover{background:var(--primary-color);color:#fff;transform:translateY(-2px)}.pagination .active .page-link{background:linear-gradient(135deg,var(--primary-color),#2d7be6);color:#fff;box-shadow:var(--box-shadow-sm)}.progress{border-radius:var(--border-radius-sm);height:1rem;background-color:#e1e5eb;box-shadow:inset 0 .1rem .1rem #0000001a}.progress-bar{background:linear-gradient(90deg,var(--primary-color),var(--secondary-color))}.table{box-shadow:var(--box-shadow-sm);border-radius:var(--border-radius-md);overflow:hidden}.table thead th{background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-bottom:2px solid #dee2e6;font-weight:600}.tooltip .tooltip-inner{border-radius:var(--border-radius-sm);padding:.5rem 1rem;background-color:var(--dark-color);color:#fff;box-shadow:var(--box-shadow)}.popover{border-radius:var(--border-radius-md);border:none;box-shadow:var(--box-shadow)}.popover-header{background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-bottom:1px solid #e1e5eb;border-top-left-radius:calc(var(--border-radius-md) - 1px);border-top-right-radius:calc(var(--border-radius-md) - 1px);font-weight:600}.dropdown-menu{border-radius:var(--border-radius-md);border:none;box-shadow:var(--box-shadow);padding:.5rem 0}.dropdown-item{padding:.5rem 1.5rem;transition:all .2s ease}.dropdown-item:hover{background:linear-gradient(90deg,var(--primary-color),#2d7be6);color:#fff}.breadcrumb{background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-radius:var(--border-radius-md);padding:1rem 1.5rem}.breadcrumb-item a{color:var(--primary-color);font-weight:500;text-decoration:none}.breadcrumb-item a:hover{color:#2d7be6;text-decoration:underline}.list-group-item{border:1px solid 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.5s ease-in-out}.slide-in-top{animation:slideInTop .5s ease-out}.slide-in-bottom{animation:slideInBottom .5s ease-out}.slide-in-left{animation:slideInLeft .5s ease-out}.slide-in-right{animation:slideInRight .5s ease-out}@keyframes slideInTop{0%{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes slideInBottom{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes slideInLeft{0%{transform:translate(-20px);opacity:0}to{transform:translate(0);opacity:1}}@keyframes slideInRight{0%{transform:translate(20px);opacity:0}to{transform:translate(0);opacity:1}}@media (max-width: 768px){.card{margin-bottom:1rem}.btn{padding:.5rem 1rem}.form-control,.form-select{padding:.625rem .875rem}.modal-dialog{margin:1rem}.table-responsive{font-size:.875rem}}@media (max-width: 576px){.card{margin-bottom:.75rem}.btn{padding:.4rem .875rem;font-size:.875rem}.form-control,.form-select{padding:.5rem .75rem;font-size:.875rem}.alert{padding:.75rem 1rem;font-size:.875rem}.badge{font-size:.75rem}}html{font-size:clamp(12px,1.5vw,16px)}*,*:before,*:after{box-sizing:border-box;-webkit-tap-highlight-color:transparent}body{font-family:Microsoft YaHei,sans-serif;margin:clamp(15px,2vw,30px);background-color:#f5f7fa;-webkit-tap-highlight-color:transparent}.main-header{background:linear-gradient(135deg,var(--primary-color, #3E9EFF),var(--secondary-color, #26d0ce));margin:clamp(10px,1.5vw,20px) clamp(5px,1vw,10px) clamp(12px,2vw,25px);padding:clamp(25px,3vw,40px) clamp(20px,2.5vw,40px);border-radius:clamp(15px,2vw,25px);box-shadow:0 10px 30px #3e9eff4d,inset 0 0 15px #fff3;position:relative;overflow:hidden;text-align:center}.logo-container{height:0rem;display:flex;justify-content:center;align-items:center;margin-top:10px;transform:translate(.5rem)}.header-logo{width:80px;height:80px;object-fit:contain;filter:drop-shadow(0 2px 8px rgba(0,0,0,.2))}@keyframes headerGlow{0%{box-shadow:0 10px 30px #3e9eff4d,inset 0 0 15px #fff3}to{box-shadow:0 10px 40px #26d0ce66,inset 0 0 25px #ffffff4d}}.title-container{position:relative;z-index:1;text-align:center}.app-title{font-size:clamp(2.2rem,4vw,3.5rem);color:#fff;margin:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-shadow:0 2px 10px rgba(0,0,0,.2);position:relative;padding:15px 0}.title-text{color:var(--text-color, white);padding:15px 30px;position:relative;letter-spacing:3px;font-weight:700;text-shadow:0 0 10px rgba(255,255,255,.5),0 0 20px rgba(255,255,255,.3);background:rgba(255,255,255,.15);border-radius:30px;backdrop-filter:blur(5px)}.title-sub{color:var(--text-color, white);font-size:clamp(1.1rem,2vw,1.5rem);margin-top:10px;letter-spacing:2px;font-weight:500;display:flex;align-items:center;gap:15px;justify-content:center;background:rgba(255,255,255,.15);padding:8px 20px;border-radius:30px;backdrop-filter:blur(5px)}.sub-icon{animation:float 2s ease-in-out infinite;font-size:1.2em}@keyframes 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#3E9EFF);cursor:pointer;transition:all .3s cubic-bezier(.25,.8,.25,1);box-shadow:0 clamp(1px,.2vw,2px) clamp(4px,.8vw,8px) #3e9eff33;font-weight:600;white-space:nowrap;-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}.grade-btn:hover{transform:translateY(-3px);box-shadow:0 6px 25px #3e9eff66}.grade-btn.active{background:var(--primary-color, #3E9EFF);color:#fff;box-shadow:0 4px 20px #3e9eff66}.class-tabs{display:flex;gap:clamp(4px,.8vw,8px);margin-bottom:clamp(12px,1.8vw,25px)}.class-btn{padding:clamp(12px,1.3vw,18px) clamp(25px,3vw,40px);border:none;border-radius:clamp(8px,1vw,12px);background:rgba(255,255,255,.9);color:var(--primary-color, #3E9EFF);cursor:pointer;transition:all .3s cubic-bezier(.25,.8,.25,1);box-shadow:0 clamp(1px,.2vw,2px) clamp(4px,.8vw,8px) 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.modal-body{overflow-y:auto}#uploadModal .modal-dialog{max-width:55em;margin:0rem auto}#uploadModal .modal-content{display:flex;flex-direction:column;max-height:85vh}#uploadModal .modal-body{flex:1;overflow-y:auto;padding:1.5rem}#sponsor-modal .modal-dialog{max-width:500px;margin:3rem auto}#sponsor-modal .modal-content{display:flex;flex-direction:column;max-height:85vh}#sponsor-modal .modal-body{flex:1;overflow-y:auto;padding:1.5rem}#image-modal .modal-content{background-color:#000000e6;display:flex;align-items:center;justify-content:center;height:90vh;margin:2.5vh auto;border-radius:8px;overflow:hidden}#image-modal .modal-header{background:linear-gradient(135deg,rgba(0,0,0,.85) 0%,rgba(30,30,30,.85) 100%);color:#fff;border-radius:8px 8px 0 0;width:100%;display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem!important;border:none;box-shadow:0 4px 12px #0000004d}#image-modal .modal-body{display:flex;flex-direction:column;height:calc(100% - 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2rem)}#uploadModal .modal-dialog,#sponsor-modal .modal-dialog{max-width:95vw}.modal-body{max-height:60vh;padding:1rem}#image-modal .modal-header{padding:.75rem 1rem}#image-modal .modal-title{font-size:1.2rem}#image-modal .image-footer{flex-direction:column;gap:10px;align-items:stretch}#image-modal .image-footer .image-controls,#image-modal .image-footer>div{display:flex;flex-wrap:wrap;justify-content:center;gap:5px}#image-modal .image-footer button{flex:1 1 auto;min-width:80px;font-size:.85rem;padding:.375rem .5rem}#image-modal .image-info{font-size:.8rem}}@media (min-width: 768px){@media (min-width: 768px){#image-modal .image-footer{flex-direction:row;align-items:center}#image-modal .image-footer .image-controls{flex:0 0 auto}}@media (min-width: 992px){.modal-lg,.modal-dialog-lg{max-width:800px}}.content-box.loading:after,.grid-container.loading:after{content:"正在加载...";display:flex;justify-content:center;align-items:center;position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(255,255,255,.9);font-size:1.2rem;color:#666;z-index:10;border-radius:12px;animation:loadingFade 1.5s infinite}@keyframes loadingFade{0%{opacity:.6;transform:scale(1)}50%{opacity:1;transform:scale(1.05)}to{opacity:.6;transform:scale(1)}}.grid-container.loading{pointer-events:none;opacity:.8}.grid-container:hover{box-shadow:0 6px 20px #0000001a}.announcement-box{background:white;border-radius:12px;padding:20px;margin-bottom:20px;box-shadow:0 4px 12px #0000000d}.announcement-header{display:flex;align-items:center;margin-bottom:15px}.announcement-header h3{margin:0 0 0 10px;color:#333}.announcement-text{line-height:1.6;color:#666}.modal{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5)}.modal{display:none;z-index:1050;overflow:auto;align-items:center;justify-content:center}.modal-content{position:relative;width:90%;max-width:800px;max-height:90vh;margin:auto;background-color:#fff}.modal-content{border-radius:12px;padding:10px;box-shadow:0 4px 20px #0000004d;overflow:auto;display:flex;flex-direction:column}.upload-form{display:flex;flex-direction:column;overflow-y:auto;padding-bottom:20px;flex:1 1 auto}.upload-section .modal-content{max-height:90vh;display:flex;flex-direction:column}.upload-btn{background:var(--primary-color, #3E9EFF);color:#fff;border:none;padding:12px 24px;border-radius:8px;cursor:pointer;font-weight:600;box-shadow:0 4px 10px #3e9eff4d;transition:all .3s ease;display:flex;align-items:center;justify-content:center;gap:8px}.upload-btn:hover{background:var(--primary-dark, #2d7be6);transform:translateY(-2px);box-shadow:0 6px 15px #3e9eff66}.drop-zone{border:2px dashed #ccc;border-radius:8px;padding:40px;text-align:center;cursor:pointer;transition:all .3s ease;background-color:#fafafa}.drop-zone:hover,.drop-zone.dragover{border-color:var(--primary-color, #3E9EFF);background-color:#3e9eff0d}.icp-container{display:flex;align-items:center;justify-content:center;margin-top:30px;padding:15px;background:white;border-radius:8px;box-shadow:0 2px 10px #0000000d}.icp-icon{margin-right:10px}.icp-custom-icon{width:24px;height:24px;vertical-align:middle}.sponsor-button{position:fixed;bottom:30px;right:30px;width:60px;height:60px;border-radius:50%;background:linear-gradient(135deg,#ff6b6b,#ff8e8e);color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 4px 15px #ff6b6b66;z-index:1000;transition:all .3s ease}.sponsor-button:hover{transform:scale(1.1);box-shadow:0 6px 20px #ff6b6b99}.sponsor-icon{font-size:24px}.sponsor-text{display:none;margin-right:10px;font-weight:600}.sponsor-button:hover .sponsor-text{display:inline}}.sponsor-modal-content{max-width:800px;width:90%;position:relative}.sponsor-qrcode{width:200px;height:200px;margin:10px auto}.sponsor-qrcode img{width:100%;height:100%;object-fit:contain}@media (max-width: 768px){body{margin:15px 10px}.grade-tabs,.class-tabs{flex-wrap:wrap}.grade-btn,.class-btn{flex:1 0 auto;margin-bottom:8px;padding:10px 15px;font-size:.9rem}.content-box{padding:15px 10px}.sponsor-button{width:50px;height:50px;bottom:20px;right:20px}}@media (max-width: 576px){.main-header{padding:20px 15px}.app-title{font-size:clamp(1.8rem,5vw,2.5rem)}.title-sub{font-size:clamp(.9rem,3vw,1.2rem);flex-direction:column;gap:8px}.grid-item{min-height:120px}.sponsor-button{width:45px;height:45px}}.modal-backdrop{z-index:1040}.modal{z-index:1050}main{z-index:auto}.announcement-header{border-bottom:2px solid #eee}.modal[aria-hidden=true]{display:none}.modal[aria-hidden=false]{display:block}.announcement-text strong{color:#f26422;font-size:1.2em;margin:10px 0}.announcement-text a{color:#409eff;text-decoration:underline}.announcement-text code{background:#f5f5f5;padding:2px 5px;border-radius:3px}.announcement-text pre{background:#f8f8f8;padding:10px;border-radius:5px;overflow-x:auto}.caption-tips{font-size:1em;margin-top:4px;opacity:.8}.weekend-tip{display:block;color:#2196f3;background:rgba(33,150,243,.1);padding:8px 12px;border-radius:8px;margin-top:8px;border-left:3px solid #2196F3}.weekend-expire{color:#ff5722!important;background:rgba(255,87,34,.1);padding:4px 8px;border-radius:6px}.weekend-tip:before{content:"⇄";display:inline-block;margin-right:6px;font-weight:700;transform:rotate(90deg);animation:swing 2s ease-in-out infinite}.expire-info{color:#ff5722;font-weight:700;font-style:normal;text-shadow:0 2px 3px rgba(255,87,34,.2)}.caption-tips span{color:#ff5722;font-size:1.1em;font-weight:900;text-shadow:0 2px 4px rgba(255,87,34,.2);position:relative;padding:0 2px}.caption-tips span:after{content:"";position:absolute;bottom:-2px;left:0;width:100%;height:2px;background:linear-gradient(90deg,transparent 10%,#FF5722 50%,transparent 90%);animation:highlight 2s linear infinite}@keyframes pulseWarning{0%,to{opacity:1}50%{opacity:.6;text-shadow:0 0 8px rgba(255,68,68,.4)}}@keyframes swing{0%,to{transform:rotate(90deg) translate(0)}50%{transform:rotate(90deg) translate(3px)}}@keyframes highlight{0%{background-position:-100% 0}to{background-position:200% 0}}@keyframes breathing{0%{opacity:.8;transform:scale(1)}50%{opacity:1;transform:scale(1.02)}to{opacity:.8;transform:scale(1)}}.weekend-adjust .expire-info{animation:breathing 3s ease-in-out infinite}.expired-date .image-box{position:relative;overflow:hidden}.image-box{min-height:300px;background:linear-gradient(135deg,#f5f7fa 0%,#e4e7f4 100%);border-radius:12px;padding:20px;position:relative;box-shadow:inset 0 0 10px #0000000d;box-sizing:border-box}.guide-message{display:flex;flex-direction:column;justify-content:center;align-items:center;height:100%;width:100%;text-align:center;color:#5f6368;box-sizing:border-box}.status-icon{font-size:3rem;margin-bottom:15px;color:#9aa0a6}.status-warn{font-size:1.3rem;font-weight:500;margin-bottom:10px;color:#d93025}.status-info{font-size:1.3rem;font-weight:500;margin-bottom:10px;color:#1a73e8}.status-detail{font-size:1.1rem;color:#5f6368;margin-top:5px}.deployed-classes,#last-upload-time{font-weight:500;color:#1a73e8}.custom-close-btn{position:relative;width:4em;height:4em;border:none;background:rgba(180,83,107,.11);border-radius:5px;transition:background .5s;cursor:pointer;outline:none}.close-x,.close-y{content:"";position:absolute;top:50%;left:50%}.close-x{width:2em;height:1.5px;background-color:#fff;transform:translate(-50%) rotate(45deg)}.close-y{width:2em;height:1.5px;background-color:#fff;transform:translate(-50%) rotate(-45deg)}.close-tooltip{position:absolute;display:flex;padding:.8rem 1.5rem;align-items:center;justify-content:center;transform:translate(-50%);top:-70%;left:50%;width:3em;height:1.7em;font-size:12px;background-color:#131618;color:#bbe5ec;border:none;border-radius:3px;pointer-events:none;opacity:0}.custom-close-btn:hover{background-color:#d31515}.custom-close-btn:active{background-color:#820000}.custom-close-btn:hover>.close-tooltip{animation:close-tooltip .2s forwards .25s}@keyframes close-tooltip{to{opacity:1}}.expired-date .image-box:after{content:"作业已过期";position:absolute;:root{--primary-color: #3E9EFF;--text-color: #333;--primary-gradient-start: #3E9EFF;--primary-gradient-end: #1a78e3;--holiday-primary: #4f46e5;--holiday-text: #fff;--holiday-secondary: #e03011;--holiday-gradient-start: #4f46e5;--holiday-gradient-end: #2d22a9}.holiday-mode{--primary-color: 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#0003}.holiday-content{display:flex;justify-content:center;align-items:center;gap:20px;flex-wrap:wrap}.holiday-name{font-weight:700;font-size:1.2em}.holiday-greeting{font-style:italic}.snowflake{position:fixed;top:-20px;z-index:9998;user-select:none;pointer-events:none;font-size:1em;animation:fall linear forwards,sway 2s ease-in-out alternate}@keyframes fall{to{transform:translateY(105vh)}}@keyframes sway{0%{transform:translate(0)}to{transform:translate(20px)}}.grade-btn,.class-btn{background:var(--primary-gradient-start);color:#fff;border:none;padding:10px 20px;margin:5px;border-radius:8px;cursor:pointer;transition:all .3s ease}.grade-btn:hover,.class-btn:hover{background:var(--primary-gradient-end);transform:translateY(-2px)}.grade-btn.active,.class-btn.active{background:linear-gradient(135deg,var(--primary-gradient-start) 0%,var(--primary-gradient-end) 100%);box-shadow:0 4px 15px #3e9eff66}.holiday-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.6);display:flex;justify-content:center;align-items:center;z-index:10;border-radius:8px}.holiday-overlay-content{text-align:center;color:#fff;padding:20px}.holiday-icon{font-size:3em;margin-bottom:10px}.holiday-text{font-size:1.2em;font-weight:700}.holiday-note{font-size:.9em;opacity:.8;margin-top:10px}}.holiday-caption{background:linear-gradient(135deg,var(--holiday-primary, #4f46e5) 0%,var(--holiday-secondary, #e03011) 100%);color:#fff;padding:15px;border-radius:10px;box-shadow:0 4px 15px #0003}.holiday-caption .holiday-name{font-weight:700;font-size:1.4em;margin-bottom:5px}.holiday-caption .holiday-date{font-size:.9em;opacity:.9;margin-bottom:5px}.holiday-caption .holiday-greeting{font-style:italic;margin-bottom:10px}.holiday-caption .holiday-message{font-size:1.2em}.default-caption{background:linear-gradient(135deg,var(--primary-color, #3E9EFF) 0%,#6c5ce7 100%);color:#fff;padding:15px;border-radius:10px;box-shadow:0 4px 15px #0003}.holiday-message{font-size:1.2em;color:var(--holiday-text, white)}.status-detail.holiday-message{font-size:1em;opacity:.9}.expired-date .image-box:after{content:"作业已过期";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:rgba(255,68,68,.9);color:#fff;padding:8px 20px;border-radius:24px;font-weight:700;box-shadow:0 4px 12px #ff44444d}.weekend-adjust .image-box{border:2px solid #2196F3;box-shadow:0 0 12px #2196f333}.upload-btn{font-family:inherit;font-size:18px;background:linear-gradient(to bottom,#4dc7d9 0%,#66a6ff 100%);color:#fff;padding:.8em 1.2em;display:flex;align-items:center;justify-content:center;border:none;border-radius:12px;box-shadow:0 4px 10px #0000001a;transition:all .3s ease;cursor:pointer;position:relative;overflow:hidden}.upload-btn:hover{transform:translateY(-2px);box-shadow:0 6px 15px #0003}.upload-btn:active{transform:translateY(0)}.upload-btn:after{content:"";position:absolute;top:50%;left:50%;width:5px;height:5px;background:rgba(255,255,255,.5);opacity:0;border-radius:100%;transform:scale(1) translate(-50%,-50%);transform-origin:center center}.upload-btn:focus:not(:active){outline:2px solid #66a6ff;outline-offset:2px}.upload-btn:active:after{animation:ripple .6s ease-out}@keyframes ripple{0%{transform:scale(0);opacity:.5}to{transform:scale(50);opacity:0}}.drop-zone{border:2px dashed #ccc;border-radius:8px;padding:40px;text-align:center;cursor:pointer;transition:all .3s ease;background-color:#fafafa}.drop-zone:hover,.drop-zone.dragover{border-color:var(--primary-color, #3E9EFF);background-color:#3e9eff0d}.upload-section{position:fixed;bottom:30px;right:30px;z-index:10000;opacity:.95;transition:all .3s ease}@media (max-width: 768px){.upload-section{bottom:20px;right:20px}}#uploadStatus{max-height:100px;overflow-y:auto;font-size:14px;line-height:1.5}.oss-config-alert{background:#fff4e5;border:2px solid #ffd8a7;border-radius:8px;padding:12px;margin-bottom:20px;color:#663d00;font-size:.9em}.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.8);z-index:999;padding:20px;overflow:hidden}.file-meta{margin:10px 0;color:#666}.file-name{font-weight:700;margin-right:8px}.file-preview-container{max-height:200px;overflow-y:auto;margin-top:10px}.file-preview{display:flex;flex-wrap:wrap;gap:10px;padding:10px}.file-preview img{max-width:100px;max-height:100px;object-fit:cover;border-radius:4px;box-shadow:0 2px 6px #0000001a}.status-loading{position:sticky;bottom:0;background:white;padding:10px 0}.status-success{color:#52c41a;font-weight:700}.status-error{color:#ff4d4f;font-weight:700}@keyframes pulse{0%{opacity:1}50%{opacity:.6}to{opacity:1}}.dragover{background:rgba(62,158,255,.1)!important;border-color:#3e9eff!important;transform:scale(1.02)}.upload-section .modal{background:rgba(0,0,0,.7)}.upload-section .modal-content{max-height:90vh;display:flex;flex-direction:column}.upload-section .upload-btn{background-color:#007bff;color:#fff;border:none;padding:10px 20px;cursor:pointer;border-radius:5px}.upload-section .upload-btn:hover{background-color:#0056b3}.upload-section .progress-bar{width:0%;height:20px;background-color:#007bff;border-radius:5px;margin-top:10px}.upload-section .progress-bar-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:#fff}.upload-section .file-list{list-style:none;padding:0;margin-top:10px}.upload-section .file-list li{background-color:#f8f9fa;padding:10px;margin-bottom:5px;border-radius:5px;display:flex;justify-content:space-between;align-items:center}.upload-section .file-list li:hover{background-color:#e9ecef}.upload-section .file-list .delete-btn{background-color:#dc3545;color:#fff;border:none;padding:5px 10px;cursor:pointer;border-radius:5px}.upload-section .file-list .delete-btn:hover{background-color:#c82333}@media (max-height: 700px){.modal-content{max-height:98vh}.file-preview{max-height:30vh}}.form-group{display:flex;align-items:center;gap:10px}.form-select,.form-input{flex:1;padding:8px 12px;border:1px solid #ddd;border-radius:6px;font-size:14px}.drop-zone{border:2px dashed #ddd;border-radius:8px;padding:20px;text-align:center;background-color:#fff;transition:all .3s ease;min-height:120px;max-height:40vh;overflow:hidden}.drop-zone.dragover{background:rgba(62,158,255,.1);border-color:#3e9eff;transform:scale(1.02)}.drop-zone:hover{background:rgba(62,158,255,.05);cursor:pointer}.upload-confirm:hover{background:#2d8be6}#uploadStatus{min-height:100px;text-align:center;font-size:14px}:root{--primary-color: #3E9EFF;--secondary-color: #26d0ce;--text-color: #ffffff;--primary-gradient-start: #1d37ca;--primary-gradient-end: #26d0ce;--holiday-primary: #1194e0ff;--holiday-secondary: #26d0ce;--holiday-text: #ffffff;--holiday-gradient-start: #1194e0ff;--holiday-gradient-end: #26d0ce;--holiday-bg-gradient-start: #1194e0ff;--holiday-bg-gradient-end: #8e44ad}.holiday-mode{--primary-color: var(--holiday-primary);--secondary-color: var(--holiday-secondary);--text-color: var(--holiday-text);--primary-gradient-start: var(--holiday-gradient-start);--primary-gradient-end: var(--holiday-gradient-end)}#holiday-banner{background:linear-gradient(135deg,var(--holiday-bg-gradient-start),#448cada8);color:var(--holiday-text);padding:3rem 1rem;text-align:center;margin:-14px -10px 25px;border-radius:0 0 15px 15px;box-shadow:0 6px 30px #0000004d;position:relative;overflow:hidden;animation:holidayPulse 8s infinite alternate}.main-header{background:linear-gradient(135deg,var(--primary-gradient-start),var(--primary-gradient-end));border-radius:0 0 15px 15px;box-shadow:0 6px 30px #ffffffda;position:relative;overflow:hidden;background-size:cover;background-position:center;animation:holidayPulse 8s infinite alternate}.holiday-content{position:relative;z-index:2;padding:1rem;border-radius:12px;max-width:1200px;margin:0 auto;backdrop-filter:blur(5px);background:rgba(255,255,255,.15)}.holiday-name{font-size:2.2rem;font-weight:700;text-shadow:0 2px 8px rgba(0,0,0,.3);margin-bottom:10px;animation:float 3s ease-in-out infinite;color:var(--holiday-text)}.holiday-greeting{font-size:1.5rem;text-shadow:0 2px 4px rgba(0,0,0,.3);color:var(--holiday-text)}@keyframes holidayPulse{0%{opacity:.9;transform:scale(1)}to{opacity:1;transform:scale(1.01)}}.holiday-caption{text-align:center;color:var(--holiday-primary);font-weight:700;padding:10px;border-radius:8px;background:rgba(255,255,255,.1);backdrop-filter:blur(5px);margin:10px 0}.holiday-caption .holiday-name{font-size:1.5em;color:var(--holiday-primary)}.holiday-caption .holiday-date{font-size:1.1em;opacity:.9}.holiday-caption .holiday-greeting{font-size:1.2em;margin-top:5px;color:inherit}.holiday-message{font-size:1.8em!important;color:var(--holiday-primary)!important;text-shadow:0 0 10px rgba(94,255,0,.757);animation:pulse 2s infinite}.holiday-mode .grade-btn.active{background:var(--primary-color);box-shadow:0 4px 15px #0003}.holiday-mode .class-btn.active{border-color:var(--holiday-primary);background:var(--holiday-primary);box-shadow:0 4px 15px #0003}.holiday-mode .upload-btn{background:linear-gradient(135deg,var(--holiday-primary),var(--holiday-secondary));box-shadow:0 6px 15px #0000004d}.holiday-mode .announcement-box{background:rgb(61 184 255 .2);border-color:var(--holiday-primary);box-shadow:0 4px 15px #0000001a}#icp-footer{position:static;bottom:15px;right:15px;background:rgba(255,255,255,.2);backdrop-filter:blur(10px);border-radius:50px;padding:10px 20px;font-size:14px;color:#000;z-index:1000;display:flex;align-items:center;transition:all .4s ease;border:1px solid rgba(255,255,255,.8);box-shadow:0 5px 20px #0000004d}#icp-footer .icp-icon{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-right:12px;flex-shrink:0;background:rgb(255,255,255)}.icp-custom-icon{width:24px;height:24px;object-fit:contain;filter:brightness(0) invert(1)}.icp-custom-icon{filter:brightness(1.4) contrast(1.4) drop-shadow(0 0 4px rgba(62,158,255,.8));transform:scale(1.1)}.icp-custom-icon.loading{background:linear-gradient(45deg,rgba(255,255,255,.1) 25%,rgba(255,255,255,.3) 50%,rgba(255,255,255,.1) 75%);background-size:200% 100%;animation:loading 1.5s infinite;filter:none}.icp-custom-icon.error{content:"!";display:flex;align-items:center;justify-content:center;background:#ff4d4f;color:#fff;font-weight:700;font-size:18px;filter:none}@media (max-width: 768px){#icp-footer{left:15px;right:15px;max-width:calc(100% - 30px);bottom:10px;padding:8px 15px;font-size:13px}#icp-footer .icp-icon{width:32px;height:32px}.icp-custom-icon{width:24px;height:24px}}@media (max-width: 480px){#icp-footer{font-size:12px;padding:6px 12px;border-radius:40px}#icp-footer .icp-icon{width:28px;height:28px}.icp-custom-icon{width:20px;height:20px}}@keyframes icp-pulse{0%{box-shadow:0 5px 20px #00000059;transform:scale(1)}50%{box-shadow:0 8px 30px #3e9eff99;transform:scale(1.03)}to{box-shadow:0 5px 20px #00000059;transform:scale(1)}}img{-webkit-touch-callout:none;-webkit-user-select:none;user-select:none;pointer-events:auto}.image-box,.grid-item{-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}@media (max-width: 480px){.app-title{flex-direction:column;gap:.5rem}.title-before,.title-after{width:60px}.grade-tabs{flex-direction:column;gap:10px}.class-tabs{flex-wrap:wrap;justify-content:center}}.meting-js{max-width:600px;margin:0 auto}@media (max-width: 768px){.meting-js{width:95%;margin:10px auto}}.close-btn{position:absolute;top:clamp(8px,1vw,16px);right:clamp(8px,1vw,16px);font-size:24px;color:#666;cursor:pointer;background:rgba(255,255,255,.95);border-radius:50%;width:clamp(36px,3vw,32px);height:clamp(36px,3vw,32px);display:flex;align-items:center;justify-content:flex-start;transition:all .2s ease;box-shadow:0 2px 6px #0003;z-index:10;flex-wrap:wrap;align-content:center;flex-direction:column}.class-btn:hover{color:#ff4d4f;box-shadow:0 0 12px 4px #ff4d4f40}.announcement-close-btn{@extend .close-btn;top:clamp(8px,1vw,16px);right:clamp(8px,1vw,16px)}.announcement-box{position:relative}.no-history-message{display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;width:100%;height:100%;min-height:300px;background:linear-gradient(135deg,#f5f7fa 0%,#e4e7f4 100%);color:#5f6368;border-radius:12px;box-shadow:inset 0 0 10px #0000000d;font-size:1.1rem;padding:20px;box-sizing:border-box;position:relative}.no-history-message:before{content:"📚";font-size:3rem;margin-bottom:15px;display:block;color:#9aa0a6}.no-history-message strong{display:block;font-size:1.3rem;margin-bottom:10px;color:#202124}.sponsor-button{position:fixed;bottom:100px;right:30px;z-index:1000;background:linear-gradient(135deg,#ff6b6b,#ff8e53);color:#fff;border-radius:50px;padding:12px 20px;display:flex;align-items:center;gap:8px;cursor:pointer;box-shadow:0 4px 15px #ff6b6b66;transition:all .3s ease;font-weight:600;font-size:16px;border:none;outline:none;overflow:hidden}.sponsor-button:before{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.4),transparent);transform:translate(-100%);transition:transform .6s ease}.sponsor-button:hover{transform:translateY(-5px) scale(1.05);box-shadow:0 6px 20px 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var(--radius-xl)}.t-tabs__nav-item{transition:color var(--transition-fast),border-color var(--transition-fast)}.t-tabs__nav-item:hover{color:var(--color-primary)}.t-tabs__nav-item.t-is-active{font-weight:var(--font-weight-semibold)}.t-collapse{border-radius:var(--radius-lg);overflow:hidden}.t-collapse-panel__header{transition:background-color var(--transition-fast)}.t-collapse-panel__header:hover{background-color:var(--bg-container-hover)}.t-skeleton{animation:skeleton-loading 1.5s ease-in-out infinite}@keyframes skeleton-loading{0%{opacity:1}50%{opacity:.5}to{opacity:1}}.t-loading{backdrop-filter:var(--glass-blur);background:var(--glass-background)}.t-loading__spinner{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.t-fade-enter-active,.t-fade-leave-active{transition:opacity var(--transition-normal)}.t-fade-enter-from,.t-fade-leave-to{opacity:0}.t-slide-enter-active,.t-slide-leave-active{transition:transform 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::-webkit-scrollbar{width:8px;height:8px}[theme-mode=dark] ::-webkit-scrollbar-track{background:var(--card-bg)}[theme-mode=dark] ::-webkit-scrollbar-thumb{background:#444;border-radius:4px}[theme-mode=dark] ::-webkit-scrollbar-thumb:hover{background:#555}[theme-mode=dark] code{background-color:var(--hover-bg);color:var(--text-color)}[theme-mode=dark] pre{background-color:var(--card-bg);border-color:var(--border-color);color:var(--text-color)}[theme-mode=dark] blockquote{border-left-color:#0052d9;color:var(--text-secondary)}[theme-mode=dark] hr{border-color:var(--border-color)}[theme-mode=dark] img:not([src*=".svg"]):not(.no-dark-filter){filter:brightness(.9)}[theme-mode=dark] .t-card{background-color:var(--card-bg);border-color:var(--border-color)}[theme-mode=dark] .t-card__header{border-color:var(--border-color)}[theme-mode=dark] .t-skeleton__row{background:linear-gradient(90deg,#2a2a2a 25%,#333 37%,#2a2a2a 63%);background-size:400% 100%}[theme-mode=dark] 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