:root{color:#17202a;text-rendering:optimizelegibility;background:#e8eef1;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5}*{box-sizing:border-box}body{min-width:320px;margin:0}button,input,select{font:inherit}button:disabled{cursor:not-allowed;opacity:.55}.app-shell{min-height:100vh;padding:24px}.submission-surface{background:#fff;border:1px solid #d4dee6;border-radius:8px;grid-template-rows:auto minmax(0,1fr);max-width:1120px;min-height:calc(100vh - 48px);margin:0 auto;display:grid;box-shadow:0 18px 42px #1f313a14}.topbar{background:#fbfcfd;border-bottom:1px solid #dce5ec;justify-content:space-between;align-items:center;gap:20px;padding:18px 22px;display:flex}.brand-row{color:#17202a;flex-wrap:wrap;align-items:center;gap:12px;min-width:0;font-size:.98rem;font-weight:800;display:flex}.brand-logo{flex:none;width:142px;height:auto;display:block}.brand-logo-large{width:min(260px,100%);height:auto;margin-bottom:10px;display:block}.brand-context{color:#344551;overflow-wrap:anywhere;background:#f2f6f8;border:1px solid #dce5ec;border-radius:999px;align-items:center;min-width:0;min-height:30px;padding:0 10px;font-size:.86rem;font-weight:900;line-height:1.2;display:inline-flex}.step-meter{flex-wrap:wrap;justify-content:flex-end;gap:8px;display:flex}.topbar-actions{justify-content:flex-end;align-items:center;gap:12px;min-width:0;display:flex}.teacher-login-link{color:#256f66;white-space:nowrap;background:#fff;border:1px solid #b6d7d0;border-radius:8px;justify-content:center;align-items:center;min-height:38px;padding:0 12px;font-size:.9rem;font-weight:900;text-decoration:none;display:inline-flex}.teacher-login-link:hover{background:#edf8f5}.step-meter span{color:#63717b;background:#f3f6f8;border:1px solid #d9e2e9;border-radius:999px;min-height:34px;padding:7px 10px;font-size:.86rem;font-weight:800}.step-meter .is-active{color:#123b36;background:#d9eee9;border-color:#9ccfc4}.content-area{align-items:center;padding:38px 34px;display:grid}.step-layout{gap:22px;width:min(100%,760px);margin:0 auto;display:grid}.code-step{width:min(100%,900px)}.code-hero{grid-template-columns:minmax(0,1fr) 180px;align-items:center;gap:28px;display:grid}.hero-brand-icon{color:#111;background:#f6f9fa;border:1px solid #dce5ec;border-radius:8px;width:180px;height:180px;padding:26px}.copy-block{max-width:680px}.copy-block.compact{max-width:620px}.eyebrow{color:#b24632;margin:0 0 8px;font-size:.9rem;font-weight:900}h1{color:#17202a;letter-spacing:0;margin:0;font-size:clamp(2rem,5.2vw,4.1rem);line-height:1.06}.compact h1,.result-layout h1{font-size:clamp(1.8rem,4vw,3.4rem)}.copy-block p:last-child,.result-layout p{color:#52616c;max-width:620px;margin:14px 0 0;font-size:1.04rem}.action-block{max-width:620px}.code-step .action-block{max-width:680px}.action-block label{color:#344551;margin-bottom:8px;font-weight:800;display:block}.code-input-row{grid-template-columns:minmax(180px,1fr) auto;gap:12px;display:grid}.code-input-row input{color:#17202a;letter-spacing:0;background:#f8fbfd;border:1px solid #b8c7d3;border-radius:8px;width:100%;height:62px;padding:0 18px;font-size:1.72rem;font-weight:900}.ui-button{color:#fff;cursor:pointer;text-align:center;white-space:normal;background:#256f66;border:0;border-radius:8px;justify-content:center;align-items:center;gap:8px;min-width:0;max-width:100%;min-height:58px;padding:0 20px;font-weight:900;line-height:1.2;display:inline-flex}.ui-button svg,.assignment-mini-button svg,.download-link svg,.zip-download-link svg{flex:none}.ui-button:hover:not(:disabled){background:#1c5a53}.secondary-button{color:#23333d;background:#edf2f5}.secondary-button:hover:not(:disabled){background:#dde7ed}.assignment-header{background:#f5f8fa;border:1px solid #dce5ec;border-radius:8px;justify-content:space-between;align-items:center;gap:16px;padding:14px 16px;display:flex}.assignment-header span,.assignment-header strong{display:block}.assignment-header span{color:#667682;font-size:.86rem;font-weight:800}.assignment-header strong{color:#17202a;font-size:1.05rem}.assignment-header button{color:#256f66;cursor:pointer;background:#fff;border:1px solid #b6d7d0;border-radius:8px;min-height:38px;padding:0 12px;font-weight:800}.number-grid{grid-template-columns:repeat(auto-fill,minmax(82px,1fr));gap:10px;display:grid}.number-button{color:#17202a;cursor:pointer;background:#fff;border:1px solid #c8d5de;border-radius:8px;place-items:center;min-height:74px;padding:8px;display:grid}.number-button:hover{border-color:#256f66}.number-button strong{font-size:1.55rem;line-height:1}.number-button span{color:#b24632;font-size:.78rem;font-weight:900}.number-button.is-submitted{background:#fff6f3;border-color:#e4b5a8}.file-picker{color:#256f66;cursor:pointer;text-align:center;background:#f7fbfa;border:2px dashed #9ccfc4;border-radius:8px;place-items:center;gap:8px;min-height:184px;padding:24px;font-size:1.1rem;font-weight:900;transition:background .16s,border-color .16s,box-shadow .16s,color .16s;display:grid;position:relative}.file-picker:hover,.file-picker.is-drag-active{color:#123b36;background:#edf8f5;border-color:#256f66}.file-picker.is-drag-active{box-shadow:inset 0 0 0 3px #256f6624}.file-picker.has-file{color:#1f5d7a;background:#f8fbfd;border-color:#86b9d7}.file-picker.has-error{color:#8d2f20;background:#fff7f5;border-color:#d98775}.file-picker svg{width:38px;height:38px}.file-picker span,.file-picker small{overflow-wrap:anywhere;max-width:100%}.file-picker small{color:#63717b;font-size:.88rem;font-weight:800}.file-picker input{clip:rect(0 0 0 0);width:1px;height:1px;position:absolute;overflow:hidden}.file-summary,.confirm-summary{background:#f5f8fa;border:1px solid #dce5ec;border-radius:8px;gap:10px;padding:16px;display:grid}.file-summary{grid-template-columns:minmax(0,1fr) auto;align-items:center}.file-summary.has-error{background:#fff7f5;border-color:#e4b5a8}.file-summary strong,.confirm-summary strong{overflow-wrap:anywhere;min-width:0}.file-summary span,.confirm-summary span{color:#63717b;font-weight:800}.confirm-summary div{grid-template-columns:90px minmax(0,1fr);gap:12px;display:grid}.button-row{flex-wrap:wrap;gap:12px;display:flex}.error-message{color:#8d2f20;background:#fff4f1;border:1px solid #e7b5a8;border-radius:8px;margin:0;padding:12px 14px;font-weight:800}.result-layout{text-align:center;justify-items:center;gap:18px;width:min(100%,680px);margin:0 auto;display:grid}.status-icon{color:#256f66;width:58px;height:58px}.status-icon.success{color:#256f66}.status-icon.danger{color:#b24632}.progress-track{background:#dce5ec;border-radius:999px;width:min(100%,420px);height:14px;overflow:hidden}.progress-track span{background:#256f66;height:100%;display:block}.teacher-shell{background:#e8eef1;min-height:100vh;padding:20px}.teacher-workspace,.teacher-login-panel{background:#fff;border:1px solid #d4dee6;border-radius:8px;max-width:1180px;min-height:calc(100vh - 40px);margin:0 auto;box-shadow:0 18px 42px #1f313a14}.teacher-login-panel{grid-template-columns:minmax(0,1fr) minmax(330px,.78fr);align-items:center;gap:32px;padding:48px;display:grid}.teacher-login-copy{align-content:center;gap:14px;max-width:600px;display:grid}.teacher-login-copy h1,.dashboard-heading h1,.teacher-list-heading h1{font-size:clamp(1.85rem,3.2vw,2.8rem)}.teacher-login-copy p:last-child,.dashboard-heading p,.section-heading p,.teacher-list-heading p{color:#52616c;margin:10px 0 0}.teacher-login-form{background:#f8fbfd;border:1px solid #dce5ec;border-radius:8px;gap:10px;padding:22px;display:grid}.teacher-login-form label{color:#344551;font-weight:900}.teacher-login-form input,.assignment-create-form input,.assignment-create-form select{color:#17202a;background:#fff;border:1px solid #b8c7d3;border-radius:8px;width:100%;min-height:48px;padding:0 12px}.assignment-create-form{border-top:1px solid #dce5ec;gap:10px;padding-top:18px;display:grid}.assignment-create-form .ui-button{width:100%;min-height:46px;padding:8px 12px}.form-two-column{grid-template-columns:minmax(0,.75fr) minmax(0,1.25fr);gap:10px;display:grid}.form-two-column>div{gap:8px;display:grid}.compact-heading{align-items:center;margin-bottom:2px}.compact-error{padding:10px 12px;font-size:.9rem}.modal-backdrop{z-index:30;background:#17202a70;place-items:center;padding:20px;display:grid;position:fixed;inset:0}.modal-panel{background:#fff;border:1px solid #c8d5de;border-radius:8px;gap:18px;width:min(100%,520px);max-height:calc(100vh - 40px);padding:22px;display:grid;overflow:auto;box-shadow:0 22px 54px #17202a38}.modal-header{justify-content:space-between;align-items:flex-start;gap:16px;display:flex}.modal-header h2{color:#17202a;margin:0;font-size:1.45rem;line-height:1.2}.modal-icon-button{color:#344551;cursor:pointer;background:#f5f8fa;border:1px solid #dce5ec;border-radius:8px;flex:none;justify-content:center;align-items:center;width:38px;height:38px;display:inline-flex}.modal-icon-button:hover:not(:disabled){background:#edf2f5}.modal-create-form{border-top:0;padding-top:0}.modal-action-row{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:10px;margin-top:4px;display:grid}.modal-action-row .ui-button{width:100%;min-height:48px}.danger-button{color:#fff;background:#b24632}.danger-button:hover:not(:disabled){background:#8d2f20}.edit-static-grid,.delete-confirm-box{background:#f5f8fa;border:1px solid #dce5ec;border-radius:8px;gap:10px;padding:14px;display:grid}.edit-static-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.edit-static-grid span,.delete-confirm-box span{color:#63717b;font-size:.84rem;font-weight:900}.edit-static-grid strong,.delete-confirm-box strong{color:#17202a;overflow-wrap:anywhere;min-width:0}.delete-confirm-box p{color:#8d2f20;margin:0;font-weight:900}.qr-modal-panel{width:min(100%,420px)}.qr-preview{background:#f8fbfd;border:1px solid #dce5ec;border-radius:8px;place-items:center;min-height:260px;padding:18px;display:grid}.qr-preview img{background:#fff;border:8px solid #fff;border-radius:8px;width:min(100%,260px);height:auto;display:block}.qr-link-box{background:#f5f8fa;border:1px solid #dce5ec;border-radius:8px;gap:4px;padding:12px;display:grid}.qr-link-box span{color:#63717b;font-size:.82rem;font-weight:900}.qr-link-box strong{color:#17202a;overflow-wrap:anywhere;min-width:0;font-size:.92rem}.teacher-topbar{background:#fbfcfd;border-bottom:1px solid #dce5ec;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:18px 20px;display:flex}.teacher-actions{flex-wrap:wrap;justify-content:flex-end;gap:10px;min-width:0;display:flex}.teacher-actions .ui-button{flex:0 auto;min-height:42px;padding:8px 14px}.teacher-main{grid-template-columns:296px minmax(0,1fr);min-height:calc(100vh - 118px);display:grid}.assignment-sidebar{background:#f7fafb;border-right:1px solid #dce5ec;align-content:start;gap:16px;padding:20px;display:grid}.teacher-meta{border-bottom:1px solid #dce5ec;gap:2px;padding-bottom:16px;display:grid}.teacher-meta span,.teacher-meta small,.assignment-summary dt{color:#63717b;font-size:.82rem;font-weight:900}.teacher-meta strong{color:#17202a;font-size:1.1rem}.assignment-list-section{gap:10px;min-width:0;display:grid}.assignment-list-header{justify-content:space-between;align-items:center;gap:10px;display:flex}.assignment-list-header h2{color:#17202a;margin:0;font-size:1rem;line-height:1.2}.assignment-list-header span{color:#63717b;font-size:.84rem;font-weight:900}.assignment-list{gap:8px;min-width:0;max-height:360px;padding-right:2px;display:grid;overflow-y:auto}.assignment-list-item{color:#17202a;cursor:pointer;text-align:left;background:#fff;border:1px solid #dce5ec;border-radius:8px;gap:8px;width:100%;min-width:0;padding:12px;display:grid}.assignment-list-item:hover{background:#f8fbfd;border-color:#9ccfc4}.assignment-list-item.is-selected{background:#edf8f5;border-color:#256f66;box-shadow:inset 3px 0 #256f66}.assignment-list-item strong{overflow-wrap:anywhere;min-width:0;font-size:.98rem;line-height:1.25}.assignment-list-meta{color:#52616c;flex-wrap:wrap;gap:6px;font-size:.8rem;font-weight:900;display:flex}.assignment-list-meta span{background:#f3f6f8;border:1px solid #dce5ec;border-radius:999px;min-height:24px;padding:2px 7px}.assignment-list-date{color:#63717b;font-size:.82rem;font-weight:900}.assignment-status-badge{color:#23333d;border:1px solid #d7e0e7;border-radius:999px;justify-self:start;min-height:24px;padding:2px 8px;font-size:.78rem;font-weight:900}.assignment-status-open{color:#123b36;background:#d9eee9;border-color:#9ccfc4}.assignment-status-closed{color:#8d2f20;background:#fff0eb;border-color:#d98775}.assignment-status-expired{color:#7a520c;background:#fff1c9;border-color:#e0b764}.assignment-status-draft{color:#52616c;background:#f3f6f8;border-color:#d7e0e7}.assignment-list-empty{color:#63717b;text-align:center;background:#fff;border:1px dashed #c8d5de;border-radius:8px;align-content:center;place-items:center;gap:8px;min-height:150px;padding:16px;font-weight:900;display:grid}.assignment-list-empty p{margin:0}.assignment-summary{gap:10px;margin:0;display:grid}.assignment-summary-panel{background:#fff;border:1px solid #dce5ec;border-radius:8px;gap:12px;padding:14px;display:grid}.assignment-summary div{grid-template-columns:58px minmax(0,1fr);gap:8px;display:grid}.assignment-summary dd{overflow-wrap:anywhere;min-width:0;margin:0;font-weight:900}.invite-code-chip{color:#123b36;letter-spacing:0;background:#edf8f5;border:1px solid #b6d7d0;border-radius:8px;align-items:center;min-height:30px;padding:0 8px;display:inline-flex}.assignment-action-row{grid-template-columns:1fr;gap:8px;display:grid}.assignment-action-row .danger-mini-button{grid-column:auto}.assignment-mini-button{color:#23333d;cursor:pointer;text-align:center;white-space:normal;background:#fff;border:1px solid #c8d5de;border-radius:8px;justify-content:center;align-items:center;gap:6px;width:100%;min-width:0;min-height:38px;padding:8px 10px;font-size:.86rem;font-weight:900;line-height:1.2;display:inline-flex}.assignment-mini-button:hover:not(:disabled){background:#edf8f5;border-color:#9ccfc4}.danger-mini-button{color:#8d2f20;background:#fff7f5;border-color:#e4b5a8}.danger-mini-button:hover:not(:disabled){background:#fff0eb;border-color:#d98775}.teacher-content{min-width:0;padding:24px}.teacher-list-page{gap:18px;min-width:0;padding:24px;display:grid}.teacher-list-heading{border-bottom:1px solid #dce5ec;justify-content:space-between;align-items:flex-start;gap:16px;padding-bottom:16px;display:flex}.teacher-list-heading>div:first-child{min-width:0}.teacher-list-count{background:#f5f8fa;border:1px solid #dce5ec;border-radius:8px;gap:2px;min-width:96px;padding:12px 14px;display:grid}.teacher-list-count span{color:#63717b;font-size:.82rem;font-weight:900}.teacher-list-count strong{color:#17202a;font-size:1.6rem;line-height:1}.assignment-table-wrap{border:1px solid #dce5ec;border-radius:8px;overflow-x:auto}.assignment-table{border-collapse:collapse;background:#fff;width:100%;min-width:900px}.assignment-table th,.assignment-table td{text-align:left;vertical-align:middle;border-bottom:1px solid #e5edf2;padding:11px 12px}.assignment-table th{color:#52616c;background:#f5f8fa;font-size:.82rem;font-weight:900}.assignment-table tr:last-child td{border-bottom:0}.assignment-table tr:hover td{background:#f8fbfd}.assignment-title-cell{gap:2px;min-width:0;display:grid}.assignment-title-cell strong{color:#17202a;overflow-wrap:anywhere;min-width:0}.assignment-title-cell small{color:#8a98a3;font-size:.8rem;font-weight:800}.assignment-table-actions{flex-wrap:wrap;gap:8px;display:flex}.assignment-table-button{color:#23333d;cursor:pointer;white-space:nowrap;background:#fff;border:1px solid #c8d5de;border-radius:8px;justify-content:center;align-items:center;gap:5px;min-height:34px;padding:0 10px;font-size:.84rem;font-weight:900;display:inline-flex}.assignment-table-button:hover{background:#edf2f5}.assignment-table-button.primary{color:#fff;background:#256f66;border-color:#256f66}.assignment-table-button.primary:hover{background:#1c5a53}.assignment-table-button.danger{color:#8d2f20;background:#fff7f5;border-color:#e4b5a8}.assignment-table-button.danger:hover{background:#fff0eb;border-color:#d98775}.back-to-list-button{width:100%;min-height:44px}.dashboard-layout{gap:18px;display:grid}.dashboard-heading{border-bottom:1px solid #dce5ec;flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px;padding-bottom:16px;display:flex}.dashboard-heading>div:first-child{flex:280px;min-width:0}.dashboard-stats{flex:0 300px;grid-template-columns:repeat(3,minmax(76px,1fr));gap:8px;min-width:min(100%,280px);display:grid}.stat-tile{background:#f5f8fa;border:1px solid #dce5ec;border-radius:8px;gap:2px;padding:10px 12px;display:grid}.stat-tile span{color:#63717b;font-size:.82rem;font-weight:900}.stat-tile strong{color:#17202a;font-size:1.45rem;line-height:1}.status-submitted{background:#edf8f5;border-color:#8cc9bc}.status-resubmitted{background:#fff7e8;border-color:#e0b764}.status-missing{color:#63717b;background:#f5f8fa;border-color:#d7e0e7}.submission-section{gap:10px;display:grid}.section-heading{justify-content:space-between;align-items:center;gap:16px;display:flex}.section-heading h2{color:#17202a;margin:0;font-size:1.25rem}.submission-table-wrap{border:1px solid #dce5ec;border-radius:8px;overflow-x:auto}.submission-table{border-collapse:collapse;background:#fff;width:100%;min-width:860px}.submission-table th,.submission-table td{text-align:left;vertical-align:middle;border-bottom:1px solid #e5edf2;padding:10px 12px}.submission-table th{color:#52616c;background:#f5f8fa;font-size:.82rem;font-weight:900}.submission-table tr:last-child td{border-bottom:0}.submission-row:hover{background:#f8fbfd}.submission-row.is-missing{background:#fbfcfd}.student-number-cell{color:#17202a;width:60px;font-size:1.02rem;font-weight:900}.filename-cell{overflow-wrap:anywhere;max-width:330px;font-weight:900;display:block}.muted-cell{color:#8a98a3;font-weight:800}.status-pill{color:#23333d;white-space:nowrap;border:1px solid #d7e0e7;border-radius:999px;align-items:center;gap:6px;min-height:30px;padding:0 9px;font-size:.84rem;font-weight:900;display:inline-flex}.version-badge,.download-link{white-space:nowrap;border-radius:8px;align-items:center;gap:6px;min-height:32px;padding:0 10px;font-size:.88rem;font-weight:900;text-decoration:none;display:inline-flex}.version-badge{color:#1f4f49;background:#e6f5f1}.version-badge.is-resubmitted{color:#7a520c;background:#fff1c9}.download-link{color:#fff;background:#256f66}.zip-download-link{color:#fff;text-align:center;white-space:normal;background:#256f66;border-radius:8px;flex:0 auto;justify-content:center;align-items:center;gap:8px;max-width:100%;min-height:46px;padding:0 16px;font-weight:900;line-height:1.2;text-decoration:none;display:inline-flex}.download-link:hover,.zip-download-link:hover{background:#1c5a53}.table-empty,.empty-state{color:#63717b;text-align:center;font-weight:900}.empty-state{align-content:center;place-items:center;gap:12px;min-height:260px;display:grid}.spin{animation:.9s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (width<=980px){.teacher-main{grid-template-columns:1fr}.assignment-sidebar{border-bottom:1px solid #dce5ec;border-right:0}.assignment-action-row{grid-template-columns:repeat(auto-fit,minmax(132px,1fr))}.assignment-list{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));max-height:none;padding-right:0}.teacher-topbar{align-items:flex-start}.teacher-actions{justify-content:flex-start}.teacher-content{padding:20px}}@media (width<=760px){.app-shell,.teacher-shell{padding:12px}.teacher-workspace,.teacher-login-panel{min-height:calc(100vh - 24px)}.teacher-login-panel{grid-template-columns:1fr;padding:24px}.brand-logo-large{width:min(220px,100%)}.teacher-topbar,.dashboard-heading,.section-heading,.teacher-list-heading{flex-direction:column;align-items:stretch}.teacher-actions,.teacher-actions .ui-button{width:100%}.teacher-main{grid-template-columns:1fr}.assignment-sidebar{border-bottom:1px solid #dce5ec;border-right:0}.teacher-content,.teacher-list-page{padding:18px}.teacher-list-count{width:100%}.dashboard-stats{grid-template-columns:repeat(3,minmax(0,1fr))}.submission-surface{min-height:calc(100vh - 24px)}.topbar,.assignment-header{flex-direction:column;align-items:stretch}.brand-row{flex-wrap:wrap;justify-content:flex-start}.brand-logo{width:128px}.brand-context{min-height:28px}.step-meter{justify-content:flex-start}.topbar-actions{flex-direction:column;align-items:flex-start}.content-area{padding:20px}.code-hero{grid-template-columns:1fr;gap:18px}.hero-brand-icon{width:118px;height:118px;padding:18px}.code-input-row,.file-summary,.confirm-summary div{grid-template-columns:1fr}.button-row{flex-direction:column}.button-row .ui-button,.code-input-row .ui-button,.modal-action-row{width:100%}.modal-backdrop{padding:12px}.modal-panel{max-height:calc(100vh - 24px);padding:18px}.modal-action-row,.edit-static-grid{grid-template-columns:1fr}}
