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.md-blockquote{border-left:3px solid var(--accent);background:var(--accent-dim);padding:11px 16px;margin:12px 0;border-radius:0 var(--radius-xs) var(--radius-xs) 0;color:var(--text2);font-style:italic}.sheet-content .md-blockquote p{margin:0;color:var(--text2)}.sheet-content .md-table-wrap{overflow-x:auto;margin:16px 0}.sheet-content table{border-collapse:collapse;width:100%;font-size:13.5px;background:var(--surface);border-radius:var(--radius-sm);overflow:hidden;box-shadow:var(--shadow-sm)}.sheet-content thead{background:var(--surface2)}.sheet-content th{padding:10px 15px;text-align:left;font-weight:600;font-size:12px;color:var(--text);border-bottom:2px solid var(--border);white-space:nowrap}.sheet-content td{padding:9px 15px;border-bottom:1px solid var(--border);color:var(--text2);vertical-align:top}.sheet-content tr:last-child td{border-bottom:none}.sheet-content tbody tr:hover{background:var(--surface2)}.sheet-content .math-display{overflow-x:auto;padding:14px 0;margin:10px 0;text-align:center}.sheet-content .math-inline{vertical-align:middle}.sheet-content .katex{font-size:1.05em}.sheet-content .katex-display{margin:8px 0}.empty-state{text-align:center;padding:72px 24px}.empty-state .empty-icon{font-size:48px;margin-bottom:18px;display:block}.empty-state p{font-size:16px;font-weight:600;color:var(--text2);margin-bottom:8px}.empty-state small{font-size:13px;color:var(--muted)}.upload-zone{border:2px dashed var(--border-hi);border-radius:var(--radius);padding:64px 36px;text-align:center;cursor:pointer;transition:all .22s;background:var(--surface);box-shadow:var(--shadow-sm)}.upload-zone:hover,.upload-zone.drag-over{border-color:var(--accent);border-style:solid;background:var(--accent-dim)}.upload-zone .upload-icon{font-size:48px;display:block;margin-bottom:16px}.upload-zone p{font-size:15.5px;font-weight:500;color:var(--text2);margin-bottom:6px}.upload-zone small{font-size:12.5px;color:var(--muted)}.upload-zone input[type=file]{display:none}.form-group{margin-bottom:18px}.form-label{display:block;font-size:11.5px;font-weight:700;color:var(--text2);margin-bottom:7px;letter-spacing:.05em;text-transform:uppercase}.form-input{width:100%;background:var(--surface);border:1px solid var(--border);color:var(--text);font-family:Inter,sans-serif;font-size:14px;padding:10px 13px;border-radius:var(--radius-sm);outline:none;transition:all .2s;box-shadow:var(--shadow-sm)}.form-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}.color-row{display:flex;gap:9px;flex-wrap:wrap}.color-dot{width:26px;height:26px;border-radius:50%;cursor:pointer;border:2px solid transparent;transition:transform .15s,box-shadow .15s}.color-dot:hover{transform:scale(1.15)}.color-dot.selected{border-color:var(--text);transform:scale(1.2);box-shadow:0 0 0 2px var(--surface),0 0 0 4px currentColor}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f111e73;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:100;animation:fadeIn .15s ease}.modal{background:var(--surface);border:1px solid var(--border);border-radius:22px;padding:30px;width:420px;max-width:calc(100vw - 40px);animation:slideUp .22s cubic-bezier(.4,0,.2,1);box-shadow:var(--shadow-lg)}.modal h3{font-size:18px;font-weight:700;margin-bottom:20px;letter-spacing:-.4px}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:22px}.badge{display:inline-flex;align-items:center;font-size:11.5px;font-weight:500;padding:3px 9px;border-radius:100px}.badge-accent{background:var(--accent-dim);color:var(--accent-text);border:1px solid var(--accent-border)}.badge-success{background:var(--success-dim);color:var(--success);border:1px solid var(--success-border)}.badge-warning{background:var(--warning-dim);color:var(--warning);border:1px solid var(--warning-border)}.badge-danger{background:var(--danger-dim);color:var(--danger);border:1px solid var(--danger-border)}.divider{height:1px;background:var(--border);margin:24px 0}.save-indicator{display:inline-flex;align-items:center;gap:5px;font-size:12px}.spin{animation:spin .8s linear infinite}.breadcrumb{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--muted);margin-bottom:20px}.breadcrumb a{color:var(--text2);text-decoration:none;transition:color .15s}.breadcrumb a:hover{color:var(--accent-text)}.breadcrumb-sep{color:var(--border-hi);-webkit-user-select:none;user-select:none}.breadcrumb-current{color:var(--text);font-weight:500}.banner{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:var(--radius-sm);border:1px solid transparent;margin-bottom:22px}.banner-warning{background:var(--warning-dim);border-color:var(--warning-border)}.banner-icon{font-size:17px;flex-shrink:0}.banner-body{flex:1;min-width:0}.banner-title{font-size:13px;font-weight:600;color:var(--warning)}.banner-sub{font-size:11.5px;color:var(--muted);margin-top:2px}.step-track{display:flex;align-items:center;padding:14px 20px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:var(--shadow-sm);margin-bottom:22px;max-width:820px}.step{display:flex;align-items:center;gap:9px}.step-connector{flex:1;height:2px;min-width:18px;background:var(--border-hi);margin:0 8px;transition:background .3s}.step-connector.done{background:var(--success)}.step-dot{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11.5px;font-weight:700;flex-shrink:0;transition:all .22s}.step-dot.pending{background:var(--surface2);color:var(--muted);border:2px solid var(--border-hi)}.step-dot.active{background:var(--accent-dim);color:var(--accent);border:2px solid var(--accent-border)}.step-dot.done{background:var(--success-dim);color:var(--success);border:2px solid var(--success-border)}.step-name{font-size:12.5px;font-weight:600}.step-name.pending{color:var(--muted)}.step-name.active{color:var(--text)}.step-name.done{color:var(--success)}.step-hint{font-size:10.5px;color:var(--muted);margin-top:2px;max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.script-popup{position:fixed;z-index:1000;width:360px;max-width:calc(100vw - 32px);background:var(--surface);border:1px solid var(--border-hi);border-radius:var(--radius-sm);box-shadow:var(--shadow-lg);transform:translate(-50%) translateY(calc(-100% - 12px));animation:popupIn .16s ease}.script-popup:after{content:"";position:absolute;bottom:-6px;left:50%;margin-left:-6px;width:11px;height:11px;background:var(--surface);border-right:1px solid var(--border-hi);border-bottom:1px solid var(--border-hi);transform:rotate(45deg)}.script-popup-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px 0;font-size:10px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--warning)}.script-popup-header button{background:none;border:none;cursor:pointer;color:var(--muted);font-size:14px;line-height:1;padding:0 2px;transition:color .15s}.script-popup-header button:hover{color:var(--text)}.script-popup-quote{font-size:13px;line-height:1.85;color:var(--text2);font-style:italic;padding:10px 16px 16px;border-left:3px solid var(--warning);margin:8px 12px 12px;background:var(--warning-dim);border-radius:0 var(--radius-xs) var(--radius-xs) 0}@keyframes popupIn{0%{opacity:0;transform:translate(-50%) translateY(calc(-100% - 6px))}to{opacity:1;transform:translate(-50%) translateY(calc(-100% - 12px))}}.module-card-next{display:inline-flex;align-items:center;gap:5px;font-size:11.5px;font-weight:500;padding:4px 10px;border-radius:100px;margin-bottom:12px;border:1px solid transparent}.example-solution-card{background:var(--surface);border:1px solid var(--success-border);border-radius:var(--radius);overflow:hidden;margin-top:24px;box-shadow:var(--shadow);animation:slideUp .28s cubic-bezier(.4,0,.2,1)}.example-solution-header{background:linear-gradient(135deg,#14532d,#16a34a);padding:20px 26px;display:flex;align-items:center;justify-content:space-between;color:#fff}.example-solution-body{border:none;border-radius:0;box-shadow:none;padding:26px 32px}.auth-bg{min-height:100vh;background:var(--bg);display:flex;align-items:center;justify-content:center;padding:24px}.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:22px;padding:38px 42px 34px;width:100%;max-width:400px;box-shadow:var(--shadow-lg);animation:slideUp .22s cubic-bezier(.4,0,.2,1)}.auth-logo{display:flex;align-items:center;gap:13px;margin-bottom:30px}.auth-tabs{display:flex;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:4px;gap:4px;margin-bottom:26px}.auth-tab{flex:1;padding:9px 14px;border:none;background:none;border-radius:var(--radius-xs);font-family:Inter,sans-serif;font-size:13.5px;font-weight:500;color:var(--muted);cursor:pointer;transition:all .18s}.auth-tab.active{background:var(--surface);color:var(--text);box-shadow:var(--shadow-sm);font-weight:600}.auth-tab:hover:not(.active){color:var(--text2)}.auth-form{display:flex;flex-direction:column;gap:14px}.auth-switch{text-align:center;margin-top:20px;font-size:13px;color:var(--muted)}.auth-switch-link{background:none;border:none;color:var(--accent-text);font-size:13px;font-weight:600;cursor:pointer;padding:0;text-decoration:underline;text-underline-offset:2px}.auth-switch-link:hover{color:var(--accent)}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes expandDown{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}@keyframes pageIn{0%{opacity:0;transform:translate(6px)}to{opacity:1;transform:translate(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 768px){.layout{grid-template-columns:1fr;grid-template-rows:var(--topbar-h) auto 1fr;overflow-x:hidden}.topbar-main{border-left:none;padding:0 12px;gap:8px}.topbar-brand{width:auto;padding:0 12px}.topbar-action-btn span:not(:first-child){display:none}.topbar-action-btn{padding:8px 12px}.semester-select{min-width:unset;max-width:140px;font-size:13px;padding:6px 10px}.semester-eyebrow{display:none}.sidebar{padding:0;grid-row:2;max-height:240px;overflow:hidden}.sidebar-inner{border-radius:0;box-shadow:none;border-left:none;border-right:none;border-top:none}.page{padding:16px 14px;overflow-x:hidden}.page-title{font-size:20px}.inputs-grid,.btn-row,.stat-row,.step-track{max-width:100%}.step-track{overflow-x:auto;padding:12px 14px;gap:0}.step-hint{max-width:80px;font-size:9.5px}.step-name{font-size:11px}.feedback-cols,.modules-grid{grid-template-columns:1fr}.week-bottom-grid{grid-template-columns:1fr!important}.feedback-header{padding:18px}.feedback-body{padding:16px}.grade-badge{padding:8px 14px}.grade-badge-num{font-size:22px}.example-solution-header{padding:16px 18px}.example-solution-body{padding:18px}.sheet-content{padding:20px 18px}.week-bottom-grid+*{flex-wrap:wrap}.module-card{padding:18px 16px 16px}}@media (max-width: 480px){.topbar-profile{display:none}.topbar-actions{gap:6px}.page{padding:12px}.step-dot{width:24px;height:24px;font-size:10px}.step-connector{min-width:10px}}