*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#dbeafe;color:#111827}button,input{font:inherit}button{width:100%;min-height:44px;border:0;border-radius:8px;background:#2563eb;color:#fff;font-weight:700}button:disabled{background:#93c5fd}.student-desktop-frame{min-height:100vh;background:linear-gradient(180deg,#dbeafe,#f8fafc)}.student-mobile-shell{position:relative;min-height:100vh;max-width:430px;margin:0 auto;background:#fff;box-shadow:0 0 40px #0f172a1f}.page{min-height:100vh;padding:32px 20px 96px}.page h1{margin:0 0 12px;font-size:26px;line-height:1.25}.page h2{margin:0 0 8px;font-size:18px}.muted{color:#64748b;line-height:1.7}.form-stack{display:grid;gap:18px;margin-top:28px}.form-stack label,.check-row{display:grid;gap:8px;font-weight:700}.check-row{grid-template-columns:auto 1fr;align-items:center;margin:28px 0}.form-stack input{width:100%;min-height:44px;border:1px solid #cbd5e1;border-radius:8px;padding:0 12px}fieldset{margin:0;border:0;padding:0}legend{margin-bottom:8px;font-weight:700}.segmented-control{display:grid;grid-template-columns:1fr 1fr;gap:8px}.segmented-control.three{grid-template-columns:repeat(3,1fr)}.segmented-control label{position:relative;display:block;border:1px solid #cbd5e1;border-radius:8px;padding:12px;text-align:center}.segmented-control label.selected{border-color:#2563eb;background:#eff6ff;color:#1d4ed8}.segmented-control input{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;margin:0;opacity:0}.summary-panel,.profile-list{margin-top:24px;border:1px solid #e2e8f0;border-radius:8px;padding:16px}.profile-list div{display:flex;justify-content:space-between;gap:16px}.profile-list dt{color:#64748b}.profile-list dd{margin:0;font-weight:700}.student-choice-list{display:grid;gap:8px}.student-choice-list label{position:relative;display:grid;grid-template-columns:1fr auto;align-items:center;min-height:48px;border:1px solid #cbd5e1;border-radius:8px;padding:10px 12px}.student-choice-list label.selected{border-color:#2563eb;background:#eff6ff;color:#1d4ed8}.student-choice-list input{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;margin:0;opacity:0}.student-choice-list small{color:#64748b;font-weight:700}.student-tabs{position:fixed;right:0;bottom:0;left:0;display:grid;grid-template-columns:repeat(3,1fr);max-width:430px;margin:0 auto;border-top:1px solid #e2e8f0;background:#fffffff5;padding-bottom:env(safe-area-inset-bottom)}.student-tabs a{padding:14px 4px;color:#64748b;text-align:center;text-decoration:none;font-size:13px;font-weight:700}.student-tabs a.active{color:#2563eb}.secondary-action{display:block;color:#2563eb;font-weight:700;text-align:center;text-decoration:none}.error-text{margin:0;color:#dc2626}.home-action-cards{display:grid;gap:12px;margin-top:20px}.action-card{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:12px;min-height:60px;border:1px solid #e2e8f0;border-radius:12px;padding:12px 16px;text-decoration:none;color:inherit;background:#f8fafc}.action-card:active{background:#f1f5f9}.action-card-icon{font-size:28px}.action-card-text strong{display:block;font-size:16px}.action-card-desc{font-size:13px;color:#64748b}.action-card-arrow{font-size:24px;color:#94a3b8;font-weight:300}.home-assignments{margin-top:28px}.assignment-list{display:grid;gap:12px;margin-top:12px}.assignment-card{border:1px solid #e2e8f0;border-radius:12px;padding:16px}.assignment-card-header{display:flex;justify-content:space-between;align-items:center;gap:8px}.assignment-status{font-size:12px;padding:2px 8px;border-radius:6px;font-weight:700;white-space:nowrap}.status-published{background:#dcfce7;color:#166534}.status-closed{background:#fef3c7;color:#92400e}.status-draft{background:#f1f5f9;color:#475569}.assignment-card-content{margin:8px 0 12px;font-size:14px;line-height:1.5}.assignment-card-actions{display:flex;gap:8px;flex-wrap:wrap}.assignment-action-btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 20px;border-radius:8px;font-size:14px;font-weight:700;text-decoration:none;background:#2563eb;color:#fff}.assignment-action-btn.btn-secondary{background:#f1f5f9;color:#2563eb}.empty-assignments{text-align:center;padding:32px 16px;border:1px dashed #cbd5e1;border-radius:12px;margin-top:12px}.page-header{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:12px;margin-bottom:20px}.page-header h1{margin:0;font-size:20px}.back-btn{width:auto;min-height:44px;padding:0 16px;background:#f1f5f9;color:#374151;font-size:14px}.upload-container{margin-top:16px}.upload-zone{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:120px;border:2px dashed #cbd5e1;border-radius:12px;padding:24px;text-align:center;color:#64748b;cursor:pointer}.upload-zone:active{background:#f8fafc}.upload-icon{font-size:32px;margin-bottom:8px}.file-list{display:grid;gap:10px;margin-top:16px}.file-item{display:grid;grid-template-columns:56px 1fr auto;gap:10px;align-items:center;border:1px solid #e2e8f0;border-radius:10px;padding:10px}.file-item.status-failed{border-color:#fca5a5;background:#fef2f2}.thumbnail{width:56px;height:56px;border-radius:6px;object-fit:cover}.file-info{min-width:0}.file-name{font-size:13px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.upload-progress-bar{height:4px;border-radius:2px;background:#e2e8f0;margin:6px 0 4px;overflow:hidden}.progress-fill{height:100%;border-radius:2px;background:#2563eb;transition:width .2s ease}.status-badge{font-size:12px;color:#64748b}.remove-btn{width:auto;min-height:44px;padding:0 12px;background:#f1f5f9;color:#64748b;font-size:13px}.footer-actions{position:fixed;right:0;bottom:0;left:0;max-width:430px;margin:0 auto;padding:12px 20px;padding-bottom:calc(12px + env(safe-area-inset-bottom));background:#fffffff5;border-top:1px solid #e2e8f0;z-index:10}.submit-btn{width:100%;min-height:48px;font-size:16px}.submit-error{margin:12px 0;padding:12px;border-radius:8px;background:#fef2f2;color:#dc2626;font-size:14px;text-align:center}.feedback-section{margin-top:20px;padding:16px;border:1px solid #e2e8f0;border-radius:12px}.feedback-section h3{margin:0 0 12px;font-size:16px}.feedback-section h4{margin:12px 0 8px;font-size:14px}.status-container{margin-top:8px;font-size:14px}.status-badge.status-graded{color:#166534}.status-badge.status-pending{color:#92400e}.comment-box{padding:12px;border-radius:8px;background:#f8fafc;font-style:italic;line-height:1.6;word-break:break-word;overflow-wrap:break-word}.rendered-gallery,.original-gallery{display:grid;gap:12px;margin-top:8px}.annotated-image-container{position:relative}.annotated-img,.original-img{width:100%;border-radius:8px}.image-label{display:block;margin-top:4px;font-size:12px;color:#64748b}.mistake-roster{margin-top:20px}.mistake-list{display:grid;gap:12px;margin-top:8px}.mistake-item{padding:12px;border:1px solid #e2e8f0;border-radius:10px}.mistake-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.mistake-number{font-weight:700;font-size:14px}.status-tag{font-size:12px;padding:2px 8px;border-radius:6px;font-weight:700}.status-tag.unresolved{background:#fef3c7;color:#92400e}.status-tag.resolved{background:#dcfce7;color:#166534}.go-correct-btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;margin-top:8px;padding:0 16px;border-radius:8px;background:#2563eb;color:#fff;font-weight:700;font-size:14px}.tab-navigation{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:20px}.tab-btn{min-height:44px;border-radius:8px;font-size:14px;background:#f1f5f9;color:#475569}.tab-btn.active{background:#2563eb;color:#fff}.mistakes-page .mistake-detail-card{border:1px solid #e2e8f0;border-radius:12px;padding:16px;margin-bottom:12px}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.index-label{font-weight:700;font-size:14px}.date-stamp{font-size:12px;color:#94a3b8}.crop-photo-wrap{margin:8px 0}.crop-preview{width:100%;max-height:200px;object-fit:contain;border-radius:8px}.comment-note{padding:10px;border-radius:8px;background:#fef3c7;font-size:14px;line-height:1.5;margin:8px 0;word-break:break-word;overflow-wrap:break-word}.card-actions{margin-top:8px}.correct-btn-action{width:100%;min-height:44px;font-size:14px}.cancel-btn{width:auto;min-height:44px;padding:0 12px;background:#f1f5f9;color:#64748b;font-size:13px}.retry-action-btn{width:auto;min-height:44px;padding:0 12px;background:#2563eb;color:#fff;font-size:13px}.resolved-panel{margin-top:12px;padding:12px;border-radius:8px;background:#f0fdf4}.corrected-gallery{display:grid;gap:8px;margin-top:8px}.corrected-thumb{width:100%;border-radius:8px}.load-more-btn{min-height:44px;margin-top:16px;background:#f1f5f9;color:#475569}.loading-text{text-align:center;padding:32px 0;color:#64748b}.error-panel{text-align:center;padding:24px 16px}.retry-btn{width:auto;min-height:44px;margin-top:12px;padding:0 24px;background:#f1f5f9;color:#374151}.error-indicator{display:grid;gap:8px;margin-top:8px}.error-hint{color:#dc2626;font-size:13px}.action-row{display:flex;gap:8px}.empty-panel{text-align:center;padding:40px 16px}.success-panel{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;text-align:center;padding:32px 16px}.success-icon{font-size:48px;margin-bottom:16px}.success-panel h2{margin:0 0 8px;font-size:20px}.success-panel .submit-btn{margin-top:24px;max-width:240px}@media (min-width: 431px){.student-desktop-frame{display:flex;align-items:flex-start;justify-content:center;padding-top:24px}}
