:root{--blue:#0d4a97;--blue-dark:#073b7e;--ink:#26364c;--muted:#7f8997;--border:#e2e7ef;--bg:#f5f7fa;--red:#b44848}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);font-size:14px;line-height:1.7}button,input,textarea,select{font:inherit}button{cursor:pointer;border:0;background:none;color:inherit}a{color:inherit;text-decoration:none}h1,h2,h3,p{margin:0}button:disabled{opacity:.5;cursor:default}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #85b7f0;outline-offset:3px}.icon{height:19px;width:19px;flex-shrink:0;vertical-align:middle}.muted{color:var(--muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 17px;border:1px solid transparent;border-radius:5px;font-size:13px;white-space:nowrap;transition:background .15s}.btn .icon{height:16px;width:16px}.primary{background:var(--blue);color:#fff}.primary:hover{background:var(--blue-dark)}.secondary{background:#fff;border-color:#d5ddea;color:#476184}.secondary:hover{background:#f1f5fb}.text-btn{font-size:13px;color:var(--blue);padding:3px 0}.text-btn:hover{text-decoration:underline;text-underline-offset:4px}.text-btn.danger{color:var(--red)}.icon-btn{display:flex;align-items:center;justify-content:center;padding:6px;border-radius:4px;color:#7b8a9d}.icon-btn:hover{background:#eef3f9}.badge{display:inline-block;font-size:12px;padding:3px 9px;border-radius:4px;white-space:nowrap;background:#f0f2f5;color:#8b94a1}.badge.blue{color:var(--blue);background:#edf3fc}.badge.red{color:var(--red);background:#fbefee}label{display:block;font-size:13px;font-weight:500;margin-bottom:19px}input:not([type=file]):not([type=checkbox]):not([type=radio]),textarea,select{display:block;width:100%;color:var(--ink);border:1px solid #d7dfeb;background:#fff;border-radius:4px;padding:10px 12px;margin-top:7px;outline:none;font-weight:400;font-size:14px}input:focus,textarea:focus,select:focus{border-color:#6095d4;box-shadow:0 0 0 3px #0d4a970b}input::placeholder,textarea::placeholder{color:#a0a9b6}textarea{resize:vertical;line-height:1.8}.form-error{font-size:12px;color:var(--red);margin-bottom:14px}.form-error:empty{display:none}.field-hint{font-size:12px;color:var(--muted);margin-top:5px}.optional{font-size:11px;color:#9ba7b7;font-weight:400;margin-left:9px}
/* School identity */
.site-header{background:#fff;border-top:4px solid var(--blue);display:flex;justify-content:space-between;align-items:center;padding:22px max(calc((100vw - 1180px)/2),32px);gap:20px}.brand{display:flex;align-items:center;gap:19px;min-width:0}.emblem{height:54px;width:54px;object-fit:contain}.college-logo{width:430px;max-width:42vw;height:auto;display:block}.user-menu{display:flex;align-items:center;gap:20px;white-space:nowrap;font-size:13px;color:#68758a}.user-menu .text-btn{font-size:12px;padding-left:17px;border-left:1px solid var(--border)}.course-nav{background:var(--blue)}.course-nav-inner{max-width:1180px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:30px;min-height:67px;color:#fff}.course-nav h1{font-size:20px;font-weight:500;letter-spacing:1px;white-space:nowrap}.course-nav h1 span{font-size:12px;color:#b6cde9;letter-spacing:0;margin-left:18px;padding-left:18px;border-left:1px solid #ffffff33}.course-nav nav{display:flex;align-self:stretch;gap:4px}.course-nav nav button{color:#c4d7ef;padding:0 25px;font-size:14px;position:relative}.course-nav nav button:hover{background:#ffffff08;color:white}.course-nav nav button.active{color:#fff;background:#ffffff0b}.course-nav nav button.active:after{content:'';position:absolute;height:3px;left:25px;right:25px;bottom:0;background:#f5c55a}.content{max-width:1180px;margin:auto;padding:35px 0 50px}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:20px}.page-heading h2{font-size:21px;font-weight:550;letter-spacing:.3px}.page-heading h2 small{font-size:13px;color:#8a97a9;font-weight:400;margin-left:12px}.panel{background:#fff;border:1px solid var(--border);border-radius:7px;overflow:hidden}.assignment-row{display:flex;align-items:center;gap:19px;padding:25px 27px;border-top:1px solid #e9edf3}.assignment-row:first-child{border-top:0}.assignment-icon{height:43px;width:43px;flex-shrink:0;display:flex;align-items:center;justify-content:center;background:#edf3fc;border:1px solid #e0e9f8;border-radius:6px;color:#4b78b2}.assignment-icon .icon{height:23px;width:23px}.assignment-info h3{font-size:16px;font-weight:500;line-height:1.6}.assignment-info p{font-size:12px;color:#919bab;margin-top:5px}.assignment-info p span{color:#6f839e}.assignment-row-end{margin-left:auto;display:flex;align-items:center;gap:15px}.submission-count{font-size:12px;color:#8b97a8;white-space:nowrap}.assignment-row-end .btn{padding:7px 13px;font-size:12px}.compact-score{font-size:19px;font-weight:600;color:var(--blue);white-space:nowrap}.compact-score small{font-size:11px;font-weight:400;margin-left:3px}.empty{padding:55px 25px;text-align:center;color:#a0aab8;font-size:13px}.empty .icon{width:33px;height:33px;color:#a7bbd6;margin-bottom:10px}.loading{text-align:center;padding:100px;color:var(--muted)}.student-guidance{margin-top:19px;font-size:12px;color:#8492a4}.table-toolbar{display:flex;align-items:center;gap:12px;padding:19px 23px;border-bottom:1px solid var(--border)}.table-toolbar select{width:230px;font-size:12px;margin:0;padding:8px 11px}.table-toolbar select#status-filter{width:135px}.table-toolbar input{margin:0!important;margin-left:auto!important;width:190px!important;font-size:12px!important;padding:8px 11px!important}.table-scroll{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:13px}th{padding:14px 23px;background:#f8fafd;color:#8492a7;font-size:12px;font-weight:400;white-space:nowrap}td{padding:17px 23px;border-top:1px solid #edf0f5}tbody tr:hover{background:#fcfdff}td strong{font-size:13px;font-weight:500}.student-number{display:block;font-size:11px;color:#98a4b5;margin-top:2px}.score-cell{font-size:18px;font-weight:600;color:var(--blue)}.align-right{text-align:right}.nowrap{white-space:nowrap}.settings-panel{max-width:650px;padding:28px 30px}.checkbox-label{display:flex;align-items:center;gap:8px;margin:24px 0;font-weight:400}.checkbox-label input{width:15px;height:15px;accent-color:var(--blue)}
/* Login */
.login-page{min-height:100vh;background:linear-gradient(150deg,#edf3fa,#f9fbfd 55%,#f0f4f9);padding-bottom:60px}.login-brand{background:#fff;border-top:4px solid var(--blue);padding:25px 45px;border-bottom:1px solid var(--border)}.login-brand img{width:455px;max-width:90vw;display:block}.login-card{max-width:395px;margin:55px auto 0;padding:35px 35px 29px;background:#fff;border:1px solid var(--border);border-radius:8px;box-shadow:0 12px 35px #193e7b06}.login-emblem{width:65px;height:65px;display:block;margin:0 auto 18px;object-fit:contain}.login-card h1{text-align:center;font-size:23px;font-weight:550;letter-spacing:1px;color:var(--blue)}.login-subtitle{text-align:center;font-size:12px;color:#8e9bb0;margin-top:4px;margin-bottom:28px}.role-switch{display:flex;border-bottom:1px solid var(--border);margin-bottom:25px}.role-switch button{flex:1;padding:9px;color:#98a4b5;font-size:14px;border-bottom:2px solid transparent}.role-switch button.active{color:var(--blue);border-color:var(--blue)}.login-submit{width:100%;padding:11px;font-size:14px;margin-top:4px}.register-link{display:block;margin:17px auto 0;font-size:12px}
/* Assignment and score dialogs */
.modal-open{overflow:hidden}.modal-backdrop{position:fixed;inset:0;background:#122a4c80;backdrop-filter:blur(2px);display:flex;align-items:center;justify-content:center;padding:24px;z-index:40}.modal{width:500px;max-height:91vh;border-radius:8px;background:#fff;box-shadow:0 16px 60px #05204033;display:flex;flex-direction:column}.modal.wide{width:730px}.modal-header{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:21px 25px;border-bottom:1px solid var(--border);flex-shrink:0}.modal-header h2{font-size:17px;font-weight:550}.modal-header p{font-size:11px;color:#9ba5b5;margin-top:4px}.modal-body{overflow:auto;padding:24px 25px}.detail-section{margin-bottom:23px}.detail-section h3,.teacher-feedback h3{font-size:13px;font-weight:600;margin-bottom:10px}.pre-text{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9;font-size:13px;color:#627087}.standard-text{white-space:pre-wrap;background:#f4f7fc;border-left:2px solid #a9bfdc;padding:11px 14px;font-size:12px;color:#6e8098}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}.form-footer{display:flex;justify-content:flex-end;align-items:center;gap:12px;padding-top:17px;margin-top:22px;border-top:1px solid var(--border)}.form-footer>.text-btn{margin-right:auto;font-size:12px}.image-picker{position:relative;display:flex;align-items:center;gap:12px;border:1px dashed #bbcee6;background:#f9fbfe;color:#5e80ad;padding:15px 18px;border-radius:5px;cursor:pointer;overflow:hidden;font-weight:400}.image-picker span{font-size:12px}.image-picker small{display:block;font-size:10px;color:#9eacc0;margin-top:3px}.image-picker .icon{width:22px;height:22px}.image-picker input{position:absolute;inset:0;opacity:0;height:100%;width:100%;cursor:pointer}.image-picker:focus-within{outline:3px solid #a5c6ef}.image-gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:12px 0 20px}.image-gallery:empty{display:none}.image-gallery>a,.image-gallery>div{display:block;border:1px solid #dce5f0;border-radius:4px;overflow:hidden;min-width:0}.image-gallery img{width:100%;height:145px;display:block;object-fit:contain;padding:4px;background:#fff}.image-gallery span{font-size:10px;color:#8699b3;background:#f8fafe;display:block;padding:5px 8px;text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.image-gallery a:hover{border-color:#779ecc}.upload-previews img{height:110px}.submission-note{display:flex;align-items:center;gap:14px;margin-bottom:20px}.submission-note strong{font-size:15px;font-weight:500;color:var(--blue)}.submission-note .text-btn{font-size:12px;margin-left:auto}.previous-images{margin-top:13px;margin-bottom:20px;font-size:12px;color:#8699b1}.previous-images summary{cursor:pointer}.previous-images .muted{font-size:11px}.result-top{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);padding-bottom:20px;margin-bottom:23px}.result-score{font-size:40px;color:var(--blue);font-weight:550;line-height:1.2}.result-score small{font-size:11px;color:#98a9bd;font-weight:400;margin-left:7px}.feedback-items article{display:flex;align-items:center;justify-content:space-between;gap:17px;padding:13px 0;border-bottom:1px solid #ecf0f6}.feedback-items strong{font-size:12px;font-weight:500}.feedback-items p{font-size:11px;color:#8b9ab0;margin-top:4px;line-height:1.8}.feedback-items b{white-space:nowrap;color:var(--blue);font-size:18px;font-weight:500}.feedback-items small{font-size:10px;color:#a3afbf;font-weight:400}.improvements{font-size:12px;color:#8798af;padding-left:18px;margin:15px 0 0}.teacher-feedback{padding:14px 16px;margin-bottom:23px;background:#f3f7fd;border-left:2px solid #9bbadd}.teacher-feedback h3{color:#6284ae}.standard-details{border:1px solid var(--border);border-radius:4px;padding:11px 14px;font-size:12px;color:#7e94b2;margin-bottom:24px}.standard-details summary{cursor:pointer}.standard-details p{margin-top:14px}.score-form-row{display:grid;grid-template-columns:105px 1fr;gap:20px}.score-form-row label{margin-bottom:0}.attachment-link{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--blue);border:1px solid var(--border);border-radius:4px;padding:11px 13px}.attachment-link .icon{width:16px;height:16px}#toast{position:fixed;bottom:27px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:#124681;color:white;padding:11px 22px;border-radius:5px;font-size:12px;z-index:100;transition:all .2s;max-width:90vw;box-shadow:0 6px 20px #17355420;text-align:center}#toast.show{opacity:1;transform:translate(-50%,0)}#toast.error{background:#a44d4d}
@media(max-width:1250px){.course-nav-inner{padding:0 32px}.content{padding:30px 32px}.site-header{padding:21px 32px}.college-logo{width:400px}.assignment-row-end{gap:10px}}
@media(max-width:850px){.site-header{padding:20px 25px}.college-logo{width:330px}.emblem{width:45px;height:45px}.brand{gap:12px}.course-nav-inner{padding:0 25px;gap:15px}.course-nav h1{font-size:18px}.course-nav h1 span{display:none}.course-nav nav button{padding:0 19px}.course-nav nav button.active:after{left:19px;right:19px}.content{padding:25px}.assignment-row{padding:23px 21px;gap:14px}.assignment-info h3{font-size:14px}.assignment-row-end{gap:10px;flex-wrap:wrap;justify-content:flex-end}.assignment-row-end .btn{font-size:11px;padding:7px 10px}.submission-count{font-size:11px}td,th{padding:14px 18px}.table-toolbar{flex-wrap:wrap}.table-toolbar select{flex:1;min-width:145px}.table-toolbar input{margin-left:0!important}.assignment-icon{height:38px;width:38px}}
@media(max-width:600px){.site-header{padding:16px 18px;flex-wrap:wrap;gap:14px}.brand{gap:11px}.emblem{width:40px;height:40px}.college-logo{max-width:none;width:min(270px,calc(100vw - 88px));max-height:30px;object-fit:contain}.user-menu{width:100%;justify-content:flex-end;font-size:12px;gap:14px}.course-nav-inner{display:block;padding:15px 18px 0}.course-nav h1{font-size:19px}.course-nav nav{margin-top:10px;gap:7px}.course-nav nav button{padding:10px 21px;font-size:13px}.course-nav nav button:first-child{margin-left:-8px}.course-nav nav button.active:after{left:20px;right:20px}.content{padding:23px 16px 35px}.page-heading{margin-bottom:15px}.page-heading h2{font-size:19px}.page-heading h2 small{font-size:11px;margin-left:7px}.page-heading .btn{padding:8px 12px;font-size:12px}.assignment-row{padding:19px 16px;flex-wrap:wrap;gap:12px}.assignment-icon{height:37px;width:37px}.assignment-info{width:calc(100% - 50px)}.assignment-info h3{font-size:14px}.assignment-info p{font-size:11px}.assignment-row-end{width:100%;justify-content:flex-end;padding-left:49px;gap:10px}.assignment-row-end .badge,.submission-count{margin-right:auto;font-size:11px}.assignment-row-end .btn{font-size:11px}.compact-score{font-size:17px}.table-toolbar{padding:15px;gap:9px}.table-toolbar select{min-width:135px;font-size:11px}.table-toolbar input{width:100%!important}.table-scroll table{min-width:575px}th,td{padding:12px 15px;font-size:12px}.score-cell{font-size:17px}.settings-panel{padding:22px 20px}.login-brand{padding:23px}.login-brand img{max-width:100%}.login-card{max-width:calc(100% - 38px);margin-top:35px;padding:29px}.login-emblem{height:59px;width:59px}.login-card h1{font-size:21px}.modal-backdrop{padding:12px}.modal{max-height:94vh}.modal-header{padding:18px}.modal-header h2{font-size:16px}.modal-header p{font-size:10px}.modal-body{padding:19px 18px}.form-row{grid-template-columns:1fr;gap:0}.image-picker{padding:13px}.image-picker small{font-size:9px}.image-gallery{gap:7px}.image-gallery img{height:100px}.score-form-row{grid-template-columns:90px 1fr;gap:15px}.result-score{font-size:36px}.pre-text{font-size:12px}.feedback-items p{font-size:11px}.standard-text{font-size:11px}.student-guidance{font-size:11px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}

@media(max-width:360px){.course-nav nav{gap:2px}.course-nav nav button{padding:10px 16px}.course-nav nav button:first-child{margin-left:-5px}}
/* Course classes */
.user-identity{display:flex;flex-direction:column;align-items:flex-end;line-height:1.7}.user-identity small{font-size:11px;color:#91a0b5;white-space:normal;max-width:230px;text-align:right}.class-filter-bar{margin:-5px 0 20px}.class-filter-bar select{width:200px;margin:0;padding:8px 11px;font-size:12px}.class-row{display:flex;align-items:center;gap:19px;padding:26px 27px;border-top:1px solid var(--border)}.class-row:first-child{border:0}.class-info h3{font-size:17px;font-weight:500}.class-info p{font-size:12px;color:#8b97a8;margin-top:5px}.class-actions{margin-left:auto;display:flex;gap:12px}.heading-actions{display:flex;gap:10px}.back-link{margin-bottom:16px}.table-toolbar #grade-class-filter{width:145px;flex-shrink:0}.table-toolbar #assignment-filter{width:230px}.table-toolbar{flex-wrap:wrap}
@media(max-width:600px){.class-row{padding:20px 16px;flex-wrap:wrap;gap:13px}.class-info{flex:1}.class-actions{width:100%;justify-content:flex-end;padding-left:49px}.class-actions .btn{font-size:12px;padding:7px 12px}.heading-actions{gap:6px}.heading-actions .btn{font-size:11px;padding:7px 9px}.page-heading h2 small{display:block;margin:0}.class-filter-bar{margin-top:0;margin-bottom:16px}.class-filter-bar select{width:100%}.table-toolbar #assignment-filter{width:auto;min-width:135px}.table-toolbar #grade-class-filter{width:auto;flex:1}.user-identity small{max-width:220px}}
.class-choices{border:0;padding:0;margin:0 0 20px;min-width:0}.class-choices legend{font-size:13px;font-weight:500;padding:0;margin-bottom:10px}.class-choices>div{display:flex;flex-wrap:wrap;gap:10px}.class-choices label{display:flex;align-items:center;gap:9px;padding:9px 20px;border:1px solid #d7dfeb;border-radius:4px;margin:0;font-size:14px;cursor:pointer;min-width:90px}.class-choices label:has(input:checked){border-color:#6591c7;background:#f1f6fc;color:var(--blue)}.class-choices input{width:16px;height:16px;accent-color:var(--blue);margin:0}
.auto-grade-label{margin-bottom:5px}.api-test-result{font-size:12px;margin-top:14px;overflow-wrap:anywhere}.api-test-result:empty{display:none}.api-test-result.success{color:#287451}.api-test-result.error,.delete-warning{color:var(--red)}.delete-warning{font-size:13px;line-height:1.9}.delete-confirm-label{margin-top:23px}.destructive{background:var(--red);color:white}.destructive:hover{background:#923939}.class-actions{align-items:center;flex-wrap:wrap}.class-actions>.danger{font-size:12px}
.danger-outline{color:var(--red);border-color:#dfc5c5}.danger-outline:hover{background:#fcf3f3}
.account-menu{position:relative}.account-menu summary{display:flex;align-items:center;gap:7px;cursor:pointer;list-style:none;border-radius:4px;padding:4px 6px}.account-menu summary::-webkit-details-marker{display:none}.account-menu summary:hover,.account-menu[open] summary{background:#f1f6fc;color:var(--blue)}.account-menu summary:focus-visible{outline:2px solid #6591c7;outline-offset:2px}.account-menu summary .icon{width:13px;height:13px}.account-dropdown{position:absolute;right:0;top:calc(100% + 7px);z-index:30;min-width:130px;padding:5px;background:white;border:1px solid var(--border);border-radius:5px;box-shadow:0 6px 20px #17355415}.account-dropdown button{display:block;width:100%;padding:10px 14px;text-align:left;white-space:nowrap;font-size:13px;color:var(--ink);background:transparent;border:0;border-radius:3px;cursor:pointer}.account-dropdown button:hover,.account-dropdown button:focus-visible{background:#f1f6fc;color:var(--blue)}
.credential{font-family:ui-monospace,monospace;font-size:20px;letter-spacing:1px;background:#f1f6fc;padding:14px;margin:12px 0;overflow-wrap:anywhere;user-select:all}.account-actions .text-btn{margin-left:12px;white-space:nowrap}.student-access-btn{margin-right:15px}.user-menu{gap:14px}
@media(max-width:600px){.course-nav nav{gap:0}.course-nav nav button{padding-left:16px;padding-right:16px}.credential{font-size:17px}.account-actions{white-space:nowrap}.login-card:has(#activate-form){margin-top:25px}.heading-actions{flex-wrap:wrap;justify-content:flex-end}.login-card:has(#password-form) h1{margin-bottom:15px}}
@media(max-width:600px){.class-actions{padding-left:0;gap:10px}.class-actions>.danger{margin-left:3px}}
/* Registry maintenance */
.roster-file{margin-top:22px}.roster-file input{display:block;margin-top:10px;width:100%;font-size:13px}.import-hint{margin:0 0 12px}.import-preview{margin:18px 0;max-height:350px;border:1px solid var(--border);border-radius:5px}.import-preview td,.import-preview th{padding:10px 12px}.import-error td{background:#fff6f5;color:var(--red)}.course-nav nav button{padding-left:20px;padding-right:20px}.course-nav nav button.active:after{left:20px;right:20px}
@media(max-width:850px){.course-nav-inner{flex-wrap:wrap;gap:0;padding-top:12px}.course-nav nav{min-height:48px}.course-nav nav button{padding-left:15px;padding-right:15px}.course-nav nav button.active:after{left:15px;right:15px}}
@media(max-width:600px){.course-nav nav{overflow-x:auto;white-space:nowrap;gap:0}.course-nav nav button{padding-left:13px;padding-right:13px;flex-shrink:0}.page-heading:has([data-action=import-roster]){flex-wrap:wrap}.import-preview table{min-width:550px}}

.registry-class h3{padding:18px 23px;font-size:15px;font-weight:500;border-top:1px solid var(--border)}.registry-class h3 small{font-size:12px;font-weight:400;color:var(--muted);margin-left:14px}.registry-class:first-child h3{border-top:0}

/* Roster columns keep their proportions regardless of name length. */
.table-scroll .roster-table{table-layout:fixed;min-width:660px}
.roster-table td{overflow-wrap:anywhere;word-break:normal;vertical-align:middle}
.roster-table .col-number{width:10%}.roster-table .col-name{width:30%}
.registry-roster .col-code{width:30%}.registry-roster .col-status{width:10%}.registry-roster .col-actions{width:20%}
.class-roster .col-submitted{width:15%}.class-roster .col-score{width:15%}.class-roster .col-actions{width:30%}