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svg{flex-shrink:0;margin-top:1px;color:var(--text-2)}.menu-item-text{display:flex;flex-direction:column;gap:1px}.menu-item-title{font-weight:600}.menu-item-sub{font-size:12px;color:var(--text-3)}.menu-label{padding:8px 10px 4px;font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--text-3)}.menu-divider{height:1px;background:var(--border);margin:6px 0}.dialog-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:rgba(15,23,42,.45);display:flex;align-items:center;justify-content:center;padding:16px;z-index:100}.dialog{background:var(--surface);border-radius:14px;box-shadow:var(--shadow-lg);width:min(560px,100%);max-height:90vh;display:flex;flex-direction:column;overflow:hidden}.dialog-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.dialog-title{font-size:16px;font-weight:700}.dialog-body{padding:16px 20px 20px;overflow:auto;display:flex;flex-direction:column;gap:16px}.toast{position:fixed;bottom:20px;left:50%;transform:translate(-50%);background:#1f2433;color:#fff;padding:10px 16px;border-radius:8px;box-shadow:var(--shadow-lg);font-size:13px;z-index:200;max-width:min(560px,calc(100vw - 32px));white-space:pre-line}.toast-error{background:#991b1b}kbd{font-family:inherit;font-size:11px;padding:1px 5px;border:1px solid var(--border-strong);border-bottom-width:2px;border-radius:4px;background:var(--surface);color:var(--text-2)}.shell{height:100vh;display:grid;grid-template-rows:var(--topbar-h) 1fr;grid-template-columns:264px minmax(0,1fr) 400px;grid-template-areas:"top top top" "rail work side";overflow:hidden}.shell.rail-collapsed{grid-template-columns:0 minmax(0,1fr) 400px}.shell.rail-collapsed .rail{display:none}.topbar{grid-area:top;display:flex;align-items:center;gap:12px;padding:0 14px;background:var(--surface);border-bottom:1px solid var(--border);min-width:0}.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:15px;white-space:nowrap}.brand-mark{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;display:inline-flex;align-items:center;justify-content:center}.assignment-pill{display:flex;align-items:center;gap:8px;min-width:0;padding:4px 10px 4px 12px;border:1px solid var(--border);border-radius:8px;background:var(--surface-2);cursor:pointer;height:36px}.assignment-pill:hover{border-color:var(--border-strong)}.assignment-pill-name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:280px}.topbar-spacer{flex:1}.topbar-actions{display:flex;align-items:center;gap:8px}.progress-inline{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text-2)}.progress-bar{width:120px;height:6px;border-radius:3px;background:#e8eaf0;overflow:hidden}.progress-bar>span{display:block;height:100%;background:var(--ok);border-radius:3px;transition:width .3s}.rail{grid-area:rail;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;min-height:0}.rail-header{padding:12px 12px 8px;display:flex;flex-direction:column;gap:8px;border-bottom:1px solid var(--border)}.rail-title-row{display:flex;align-items:center;justify-content:space-between}.add-student-files{list-style:none;margin:0;padding:0;font-size:12.5px;border:1px solid var(--border);border-radius:var(--radius-sm)}.add-student-files li{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:3px 4px 3px 10px}.add-student-files li+li{border-top:1px solid var(--border)}.rail-list{flex:1;overflow:auto;padding:6px}.student-row{display:flex;align-items:center;gap:10px;width:100%;padding:7px 8px;border:none;background:transparent;border-radius:8px;cursor:pointer;text-align:left}.student-row:hover{background:var(--surface-2)}.student-row.selected{background:var(--accent-soft)}.avatar{width:30px;height:30px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:#fff;flex-shrink:0}.student-row-main{flex:1;min-width:0}.student-row-name{display:block;font-weight:600;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.student-row.selected .student-row-name{color:var(--accent-text)}.student-row-sub{display:block;font-size:11.5px;color:var(--text-3)}.student-row-score{font-size:12px;font-weight:700;color:var(--ok);white-space:nowrap}.student-row-delete{opacity:0;border:none;background:transparent;color:var(--text-3);cursor:pointer;padding:4px;border-radius:4px;display:inline-flex}.student-row:hover .student-row-delete{opacity:1}.student-row-delete:hover{color:var(--bad);background:var(--bad-soft)}.work{grid-area:work;display:flex;flex-direction:column;min-width:0;min-height:0;overflow:auto}.work-header{display:flex;align-items:center;gap:10px;padding:8px 14px;background:var(--surface);border-bottom:1px solid var(--border);min-height:48px}.work-student{font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-tabs{display:flex;gap:4px;overflow-x:auto;flex:1;min-width:0;scrollbar-width:thin}.file-tab{display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 10px;border-radius:6px;border:1px solid var(--border);background:var(--surface-2);font-size:12.5px;font-weight:600;color:var(--text-2);cursor:pointer;white-space:nowrap;max-width:240px}.file-tab span{overflow:hidden;text-overflow:ellipsis}.file-tab.active{background:var(--accent-soft);border-color:#c7cbff;color:var(--accent-text)}.work-body{flex:1;min-height:0;display:flex;flex-direction:column;padding:12px;gap:10px;overflow:hidden}.side{grid-area:side;background:var(--surface);border-left:1px solid var(--border);display:flex;flex-direction:column;min-height:0}.side-tabs{padding:10px 12px;border-bottom:1px solid var(--border)}.side-body{flex:1;overflow:auto;padding:14px;display:flex;flex-direction:column;gap:14px}.welcome{margin:0 auto;max-width:760px;width:100%;padding:24px;display:flex;flex-direction:column;gap:18px}.welcome h1{font-size:22px;font-weight:800}.welcome-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.welcome-step{padding:16px;display:flex;flex-direction:column;gap:8px}.welcome-step-num{width:24px;height:24px;border-radius:50%;background:var(--accent-soft);color:var(--accent-text);font-weight:800;font-size:12px;display:inline-flex;align-items:center;justify-content:center}.welcome-step h3{font-size:14px}.welcome-step p{font-size:12.5px;color:var(--text-2);flex:1}.type-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.type-option{display:flex;flex-direction:column;gap:3px;text-align:left;padding:10px 12px;border-radius:8px;border:1px solid var(--border);background:var(--surface);cursor:pointer}.type-option:hover{border-color:var(--border-strong)}.type-option.active{border-color:var(--accent);background:var(--accent-soft);box-shadow:0 0 0 1px var(--accent)}.type-option-title{font-weight:700;font-size:13px}.type-option-desc{font-size:12px;color:var(--text-2)}.drop-hint{border:2px dashed var(--border-strong);border-radius:var(--radius);padding:18px;text-align:center;color:var(--text-2)}.drop-active{border-color:var(--accent);background:var(--accent-soft)}@media (max-width: 1180px){.shell{grid-template-columns:220px minmax(0,1fr) 360px}.progress-inline .progress-bar{display:none}}@media (max-width: 900px){.shell,.shell.rail-collapsed{grid-template-columns:1fr;grid-template-rows:var(--topbar-h) auto 70vh auto;grid-template-areas:"top" "rail" "work" "side";height:auto;overflow:visible}.rail{max-height:240px}.welcome-steps,.type-grid{grid-template-columns:1fr}.brand-name,.btn-label,.progress-inline{display:none}.topbar{gap:6px;padding:0 8px}.assignment-pill-name{max-width:110px}}.work-body.work-compare{flex-direction:row}.viewer-pane{flex:1;min-width:0;min-height:0;display:flex;flex-direction:column;gap:6px}.pane-file-select{height:30px;font-weight:600;font-size:12.5px}@media (max-width: 900px){.work-body.work-compare{flex-direction:column}}.welcome-teams-setup{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface-2);padding:8px 12px}.welcome-teams-setup>summary{cursor:pointer;font-weight:600;font-size:13px;color:var(--accent-text)}.welcome-teams-setup[open]>summary{margin-bottom:10px}