:root{--ground:#f4f4f2;--card:#fff;--ink:#1c1e26;--muted:#6d7078;--line:#e3e2de;--line-strong:#cfceca;--accent:#4f46e5;--accent-soft:#eceafd;--accent-ink:#fff;--ok:#1f9d55;--ok-soft:#e3f4ea;--warn:#b7791f;--warn-soft:#faf0da;--crit:#d64545;--crit-soft:#fbe9e9;--shadow:0 1px 2px #1c1e260f;--font-ui:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-data:ui-monospace, "SF Mono", "JetBrains Mono", Menlo, monospace;--radius:8px}[data-theme=dark]{--ground:#17181c;--card:#1f2126;--ink:#e8e8ea;--muted:#9a9da6;--line:#2c2e35;--line-strong:#3d404a;--accent:#7b74f0;--accent-soft:#2a2850;--accent-ink:#fff;--ok:#4cc38a;--ok-soft:#16301f;--warn:#d8a03d;--warn-soft:#33290f;--crit:#e56868;--crit-soft:#3a1d1d;--shadow:0 1px 2px #0006}*{box-sizing:border-box}html,body,#root{height:100%}body{font-family:var(--font-ui);color:var(--ink);background:var(--ground);-webkit-font-smoothing:antialiased;margin:0;font-size:14px;line-height:1.45}h1,h2,h3{margin:0}a{color:var(--accent);text-decoration:none}button{font-family:inherit}.mono{font-family:var(--font-data);font-variant-numeric:tabular-nums}.btn{border-radius:var(--radius);cursor:pointer;background:var(--accent);color:var(--accent-ink);border:1px solid #0000;align-items:center;gap:6px;padding:8px 14px;font-size:13px;font-weight:600;display:inline-flex}.btn:hover{filter:brightness(1.07)}.btn:disabled{opacity:.6;cursor:default}.btn-ghost{background:var(--card);color:var(--ink);border-color:var(--line-strong)}.btn-ghost:hover{filter:none;background:var(--ground)}.btn-danger{background:var(--card);color:var(--crit);border-color:var(--crit)}.btn-danger:hover{filter:none;background:color-mix(in srgb, var(--crit) 10%, var(--card))}.btn:focus-visible,.filter-chip:focus-visible,.nav-link:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.card-pad{padding:16px}.card-title{letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:12px;font-size:11px;font-weight:700}.chip{white-space:nowrap;border-radius:999px;align-items:center;gap:4px;padding:2px 9px;font-size:11.5px;font-weight:600;display:inline-flex}.chip-ok{background:var(--ok-soft);color:var(--ok)}.chip-warn{background:var(--warn-soft);color:var(--warn)}.chip-crit{background:var(--crit-soft);color:var(--crit)}.chip-accent{background:var(--accent-soft);color:var(--accent)}.chip-muted{background:var(--ground);color:var(--muted)}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:13.5px}th{text-align:left;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);border-bottom:1px solid var(--line-strong);white-space:nowrap;padding:10px 12px;font-size:11px;font-weight:700}td{border-bottom:1px solid var(--line);vertical-align:middle;padding:10px 12px}tbody tr:last-child td{border-bottom:none}tr.row-link{cursor:pointer}tr.row-link:hover td{background:var(--accent-soft)}.app-shell{min-height:100vh;display:flex}.sidebar{background:var(--card);border-right:1px solid var(--line);flex-direction:column;flex-shrink:0;width:224px;height:100vh;display:flex;position:sticky;top:0}.sidebar-logo{border-bottom:1px solid var(--line);align-items:center;gap:10px;padding:18px 16px 14px;display:flex}.logo-mark{border-radius:var(--radius);background:var(--accent);width:30px;height:30px;color:var(--accent-ink);place-items:center;font-size:14px;font-weight:800;display:grid}.logo-text{line-height:1.2}.logo-text b{font-size:13.5px;display:block}.logo-text span{color:var(--muted);font-size:11px}.sidebar nav{flex-direction:column;flex:1;gap:1px;padding:10px 10px 20px;display:flex;overflow-y:auto}.nav-group{letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:14px 8px 4px;font-size:10px;font-weight:700}.nav-link{border-radius:var(--radius);color:var(--ink);align-items:center;gap:9px;padding:8px 10px;font-size:13.5px;font-weight:500;display:flex}.nav-link:hover{background:var(--ground)}.nav-link.active{background:var(--accent-soft);color:var(--accent);font-weight:600}.nav-link .soon{color:var(--muted);border:1px solid var(--line-strong);border-radius:999px;margin-left:auto;padding:1px 6px;font-size:10px}.nav-link.disabled{color:var(--muted);cursor:default}.nav-link.disabled:hover{background:0 0}.sidebar-footer{border-top:1px solid var(--line);align-items:center;gap:10px;padding:12px 16px;font-size:13px;display:flex}.sidebar-footer .who{flex:1;min-width:0}.sidebar-footer .who b{white-space:nowrap;text-overflow:ellipsis;font-size:13px;display:block;overflow:hidden}.sidebar-footer .who span{color:var(--muted);font-size:11px}.icon-btn{color:var(--muted);cursor:pointer;border-radius:var(--radius);background:0 0;border:none;place-items:center;padding:6px;display:grid}.icon-btn:hover{background:var(--ground);color:var(--ink)}.main-col{flex-direction:column;flex:1;min-width:0;display:flex}.page{flex-direction:column;gap:16px;width:100%;max-width:1160px;margin:0 auto;padding:24px;display:flex}.page-head{flex-wrap:wrap;align-items:baseline;gap:12px;display:flex}.page-head h1{letter-spacing:-.01em;font-size:19px;font-weight:700}.page-note{color:var(--muted);font-size:13px}.spacer{flex:1}.filters{flex-wrap:wrap;gap:6px;display:flex}.filter-chip{border:1px solid var(--line-strong);background:var(--card);color:var(--muted);cursor:pointer;border-radius:999px;padding:5px 12px;font-size:12.5px;font-weight:500}.filter-chip.active{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.login-screen{place-items:center;min-height:100vh;padding:24px;display:grid}.login-card{flex-direction:column;gap:14px;width:100%;max-width:360px;padding:28px;display:flex}.login-logo{align-items:center;gap:10px;margin-bottom:6px;display:flex}.field{flex-direction:column;gap:5px;display:flex}.field label{color:var(--muted);font-size:12px;font-weight:600}.field input{border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--card);color:var(--ink);padding:9px 12px;font-family:inherit;font-size:14px}.field input:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:var(--accent)}.password-wrap{display:flex;position:relative}.password-wrap input{width:100%;padding-right:38px}.password-toggle{width:30px;height:30px;color:var(--muted);cursor:pointer;background:0 0;border:none;border-radius:8px;justify-content:center;align-items:center;display:flex;position:absolute;top:50%;right:4px;transform:translateY(-50%)}.password-toggle:hover{color:var(--ink);background:var(--line)}.form-error{background:var(--crit-soft);color:var(--crit);border-radius:var(--radius);padding:9px 12px;font-size:13px}.progress{background:var(--ground);border:1px solid var(--line);vertical-align:middle;border-radius:3px;width:72px;height:5px;display:inline-block;overflow:hidden}.progress i{background:var(--accent);height:100%;display:block}.detail-grid{grid-template-columns:340px 1fr;align-items:start;gap:16px;display:grid}@media (width<=900px){.detail-grid{grid-template-columns:1fr}}.stat-row{flex-wrap:wrap;gap:20px;display:flex}.stat b{font-size:17px;font-weight:700;display:block}.stat span{color:var(--muted);font-size:11.5px}.answer-item{border-bottom:1px solid var(--line);flex-direction:column;gap:8px;padding:14px 16px;display:flex}.answer-item:last-child{border-bottom:none}.answer-meta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;display:flex}.answer-q{white-space:pre-wrap;font-weight:600}.answer-pair{flex-direction:column;gap:4px;font-size:13px;display:flex}.answer-pair .given{color:var(--crit)}.answer-pair .given.correct,.answer-pair .expected{color:var(--ok)}.answer-expl{background:var(--ground);border-left:3px solid var(--line-strong);border-radius:0 var(--radius) var(--radius) 0;color:var(--muted);white-space:pre-wrap;padding:8px 12px;font-size:13px}.code-block{font-family:var(--font-data);background:var(--ground);border:1px solid var(--line);border-radius:var(--radius);white-space:pre;padding:10px 12px;font-size:12.5px;overflow-x:auto}.empty-state{text-align:center;color:var(--muted);padding:40px}.burger{display:none}@media (width<=800px){.burger{display:grid}.sidebar{z-index:30;box-shadow:none;transition:transform .2s;position:fixed;top:0;left:0;transform:translate(-100%)}.sidebar.open{transform:translate(0);box-shadow:0 0 40px #00000040}.mobile-topbar{background:var(--card);border-bottom:1px solid var(--line);z-index:10;align-items:center;gap:10px;padding:10px 14px;display:flex;position:sticky;top:0}.page{padding:16px}.detail-grid{grid-template-columns:1fr}}@media (width>=801px){.mobile-topbar{display:none}}@media (prefers-reduced-motion:reduce){*{transition:none!important}}.contract-actions{flex-wrap:wrap;gap:6px;display:flex}.exempt-add{gap:8px;max-width:420px;margin-bottom:12px;display:flex}.exempt-add .input{flex:1}.page-wide{max-width:1440px}.view-tabs{border-bottom:1px solid var(--line);gap:2px;margin-bottom:-8px;display:flex;overflow-x:auto}.view-tab{color:var(--muted);cursor:pointer;white-space:nowrap;background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-1px;padding:8px 12px;font-size:13px;font-weight:600}.view-tab:hover{color:var(--ink)}.view-tab.active{color:var(--accent);border-bottom-color:var(--accent)}.toolbar{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.search-input{border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--card);min-width:280px;color:var(--muted);align-items:center;gap:7px;padding:0 8px 0 10px;display:flex}.search-input:focus-within{outline:2px solid var(--accent);outline-offset:-1px}.search-input input{color:var(--ink);background:0 0;border:none;outline:none;flex:1;min-width:0;padding:8px 0;font-family:inherit;font-size:13.5px}.search-input input::-webkit-search-cancel-button{display:none}.chips-row{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.chips-row .filter-chip{align-items:center;gap:5px;display:inline-flex}.students-layout{display:block}.students-layout.with-filters{grid-template-columns:260px 1fr;align-items:start;gap:16px;display:grid}.students-card{overflow:hidden}.filter-panel{flex-direction:column;gap:14px;display:flex;position:sticky;top:16px}.filter-panel-head{justify-content:space-between;align-items:center;gap:8px;display:flex}.filter-block{flex-direction:column;gap:6px;display:flex}.filter-block>label{letter-spacing:.04em;text-transform:uppercase;color:var(--muted);font-size:11.5px;font-weight:700}.filter-divider{background:var(--line);height:1px;margin:2px 0}.input{border:1px solid var(--line-strong);border-radius:var(--radius);background:var(--card);color:var(--ink);padding:8px 10px;font-family:inherit;font-size:13.5px}.input:focus{outline:2px solid var(--accent);outline-offset:-1px}.input.compact{padding:6px 8px;font-size:13px}.btn.small{padding:5px 10px;font-size:12px}.btn-on{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.popover-anchor{position:relative}.popover{z-index:20;background:var(--card);border:1px solid var(--line-strong);border-radius:var(--radius);min-width:200px;max-height:320px;padding:8px;position:absolute;top:calc(100% + 6px);right:0;overflow-y:auto;box-shadow:0 8px 24px #0000001f}.popover-row{cursor:pointer;border-radius:6px;align-items:center;gap:8px;padding:5px 6px;font-size:13px;display:flex}.popover-row:hover{background:var(--ground)}.popover-row input[disabled]{cursor:not-allowed}.data-table th.sortable{cursor:pointer;-webkit-user-select:none;user-select:none}.data-table th.sortable:hover{color:var(--ink)}.th-inner{align-items:center;gap:4px;display:inline-flex}.sort-hint{opacity:0}.data-table th.sortable:hover .sort-hint{opacity:.5}.data-table thead th{z-index:2;background:var(--card);position:sticky;top:0}.data-table tr.row-active td{background:var(--accent-soft)}.cell-student b{font-weight:600;display:block}.cell-sub{color:var(--muted);flex-wrap:wrap;gap:7px;font-size:11.5px;display:flex}.cell-stage{flex-wrap:wrap;align-items:center;gap:7px;display:flex}.cell-stack{flex-direction:column;gap:2px;display:flex}.muted{color:var(--muted)}.crit{color:var(--crit);font-weight:600}.table-foot{border-top:1px solid var(--line);padding:10px 12px}.pagination{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.per-page{align-items:center;gap:6px;display:flex}.pager{align-items:center;gap:6px;font-size:13px;display:flex}.pager .icon-btn:disabled{opacity:.35;cursor:default}.pager .icon-btn:disabled:hover{color:var(--muted);background:0 0}.spin{animation:.9s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.peek-backdrop{z-index:40;background:#00000047;position:fixed;inset:0}.peek{z-index:41;background:var(--card);border-left:1px solid var(--line-strong);flex-direction:column;width:380px;max-width:100vw;display:flex;position:fixed;top:0;bottom:0;right:0;box-shadow:-8px 0 32px #00000026}.peek-head{border-bottom:1px solid var(--line);align-items:flex-start;gap:10px;padding:16px;display:flex}.peek-head b{font-size:15px}.peek-body{flex:1;padding:16px;overflow-y:auto}.peek-body .card-title{margin-top:18px}.peek-body .card-title:first-child{margin-top:0}.peek-row{grid-template-columns:130px 1fr;align-items:start;gap:10px;padding:6px 0;font-size:13px;display:grid}.peek-row>span{color:var(--muted)}.peek-foot{border-top:1px solid var(--line);padding:12px 16px}.peek-foot .btn{justify-content:center;width:100%}.card-list{flex-direction:column;display:flex}.row-card{text-align:left;border:none;border-bottom:1px solid var(--line);background:var(--card);width:100%;color:var(--ink);cursor:pointer;flex-direction:column;gap:6px;padding:12px 14px;font-size:13px;display:flex}.row-card:last-child{border-bottom:none}.row-card.row-active{background:var(--accent-soft)}.row-card-head{justify-content:space-between;align-items:center;gap:8px;display:flex}.row-card-meta{flex-wrap:wrap;gap:10px;font-size:12px;display:flex}.mobile-only{display:none}@media (width<=800px){.desktop-only{display:none}.mobile-only{display:flex}.students-layout.with-filters{grid-template-columns:1fr}.filter-panel{position:static}.search-input{width:100%;min-width:0}.toolbar{align-items:stretch}.peek{border-left:none;border-top-left-radius:14px;border-top-right-radius:14px;width:100%;height:88vh;top:auto}}.data-table tr.dragging{opacity:.4}.drag-handle{cursor:grab;color:var(--muted);width:34px}.lesson-add{gap:8px;margin-top:12px;display:flex}.lesson-add .input{flex:1;max-width:420px}.modal-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);width:min(680px,100vw - 32px);height:fit-content;max-height:calc(100vh - 64px);box-shadow:var(--shadow);z-index:50;flex-direction:column;gap:12px;margin:auto;padding:16px;display:flex;position:fixed;inset:0;overflow-y:auto}.yaml-input{min-height:260px;font-family:var(--font-data);resize:vertical;font-size:12.5px}.import-errors{flex-direction:column;gap:4px;max-height:180px;display:flex;overflow-y:auto}.import-ok{flex-direction:column;align-items:flex-start;gap:6px;display:flex}.editor-layout{grid-template-columns:300px 1fr;align-items:start;gap:14px;display:grid}.editor-main{grid-template-columns:1fr 1fr;align-items:start;gap:14px;display:grid}.step-list{flex-direction:column;gap:2px;display:flex}.step-row{cursor:pointer;border-radius:6px;align-items:center;gap:8px;padding:7px 8px;font-size:13px;display:flex}.step-row:hover{background:var(--accent-soft)}.step-row.active{background:var(--accent-soft);outline:1px solid var(--accent)}.step-row-title{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;overflow:hidden}.step-row-actions{gap:0;display:flex}.step-add{color:var(--muted);align-items:center;gap:6px;margin-top:8px;display:flex}.step-form{flex-direction:column;gap:10px;display:flex}.opt-row{align-items:center;gap:8px;margin-top:4px;display:flex}.opt-row .input{flex:1}.btn-sm{align-self:flex-start;margin-top:6px;padding:4px 10px;font-size:12px}.editor-actions{margin-top:12px}.preview{flex-direction:column;gap:8px;font-size:13.5px;display:flex}.preview-title{font-size:15px;font-weight:700}.preview-q{font-weight:600}.preview-opt{border:1px solid var(--line);border-radius:6px;padding:7px 10px}.preview-opt.correct{border-color:var(--ok);background:var(--ok-soft)}.preview-blank{background:var(--ok-soft);color:var(--ok);border-radius:3px;padding:0 3px;font-weight:700}.preview-buggy{background:var(--crit-soft);border-radius:3px}.preview-video{border:1px dashed var(--line-strong);color:var(--muted);border-radius:6px;padding:14px}.preview-expl{border-top:1px solid var(--line);color:var(--muted);padding-top:8px}.preview .code-block{margin:0}.preview ul{margin:0;padding-left:18px}.preview p{margin:0}@media (width<=1100px){.editor-main{grid-template-columns:1fr}}@media (width<=800px){.editor-layout{grid-template-columns:1fr}}.live-row{cursor:pointer}.live-row:hover{border-color:var(--accent)}.live-dot{border-radius:50%;flex-shrink:0;width:9px;height:9px}.live-dot.hot{background:var(--ok);box-shadow:0 0 0 3px var(--ok-soft)}.live-dot.warm{background:var(--warn)}.live-dot.idle{background:var(--line-strong)}.timeline-row{border-bottom:1px solid var(--line);align-items:baseline;gap:8px;padding:6px 0;font-size:13px;display:flex}.timeline-icon{flex-shrink:0}.timeline-text{flex:1;min-width:0}.timeline-at{flex-shrink:0;font-size:11.5px}.q-text{-webkit-line-clamp:2;-webkit-box-orient:vertical;max-width:480px;display:-webkit-box;overflow:hidden}.filters .input{max-width:200px}.nav-badge{text-align:center;background:var(--accent-soft);min-width:18px;color:var(--accent);border-radius:999px;margin-left:auto;padding:1px 5px;font-size:10.5px;font-weight:700}.nav-badge.crit{background:var(--crit-soft);color:var(--crit)}.stat-row{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;display:grid}.stat-value{font-size:26px;font-weight:700;font-family:var(--font-data)}.stat-label{color:var(--muted);margin-top:2px;font-size:12px}.stat.ok .stat-value{color:var(--ok)}.stat.crit .stat-value{color:var(--crit)}.stat.accent .stat-value{color:var(--accent)}.outcome-bar{background:var(--line);border-radius:999px;height:10px;display:flex;overflow:hidden}.outcome-bar .ok-part{background:var(--ok)}.outcome-bar .fail-part{background:var(--crit)}.outcome-bar .unrel-part{background:var(--warn)}