:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;min-width:320px;min-height:100vh}#root{width:100%;min-height:100vh}body{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f5f5f5;color:#1f1f1f;margin:0}.App{min-height:100vh;display:flex;justify-content:center;align-items:flex-start;padding:32px 0}.survey-container{width:min(960px,100%);background:#fff;border-radius:16px;box-shadow:0 18px 45px #0f172a14;padding:32px}.survey-header{text-align:center;margin-bottom:24px}.survey-header h1{font-size:2rem;margin-bottom:6px}.survey-header p{margin:0 auto;color:#4b5563;max-width:60%}.instructions,.session-info,.pair-info details{border:1px solid #e5e7eb;border-radius:10px;padding:16px;margin-bottom:20px;background:#fafafa}.progress-container{border-radius:10px;padding:4px 0;background:transparent;border:none;margin:12px auto 0;width:100%;text-align:center}.progress-text-compact{font-size:.85rem;color:#6b7280;margin-bottom:6px}.progress-bar{background:#e5e7eb;border-radius:8px;height:12px;overflow:hidden}.progress-fill{background:#1f2937;height:6px;border-radius:6px;transition:width .3s ease}.image-pair{border-radius:12px;border:1px solid #e5e7eb;padding:20px;margin-bottom:20px;background:#fff}.images-container{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:32px;justify-items:center;align-items:center}.pair-header,.instructions,.session-info{text-align:left}.image-container{display:flex;justify-content:center;align-items:center}.image-container{flex:1;min-width:250px;border:1px solid transparent;border-radius:12px;overflow:hidden;position:relative}.survey-image{width:256px;height:256px;display:block;object-fit:cover;border-radius:12px;outline:none}.survey-image:focus-visible{outline:3px solid #2563eb;outline-offset:4px}.image-label{position:absolute;bottom:12px;left:12px;background:#000000a6;color:#fff;padding:4px 10px;border-radius:6px;font-size:.85rem}.selection-feedback{padding:14px;border-radius:10px;border:1px solid #d1d5db;background:#f9fafb;margin-top:12px;text-align:center}button{border-radius:8px;border:none;background:#1f2937;color:#fff;padding:12px 24px;font-weight:600;cursor:pointer;transition:background .2s ease}button:hover{background:#111827}.warning-banner,.offline-indicator,.error-message{border-radius:10px;border:1px solid #f3f4f6;padding:16px;background:#fff5f5;color:#b91c1c;margin-bottom:20px}.loading,.completion-message{text-align:center;padding:40px 20px}.session-info code{display:block;margin-top:8px;padding:12px;background:#f3f4f6;border-radius:8px;font-family:Menlo,SFMono-Regular,monospace}.comment-section{margin-top:24px;display:flex;flex-direction:column;gap:10px}.comment-section textarea{min-height:120px;border-radius:10px;border:1px solid #d1d5db;padding:12px;font-family:inherit;resize:vertical}.comment-section textarea.comment-disabled{background:#f3f4f6;color:#6b7280}.comment-section label{font-weight:600;color:#111827}.comment-section .save-comment{align-self:flex-start;background:#1f2937;color:#fff;border:none;border-radius:8px;padding:10px 18px;cursor:pointer;transition:background .2s ease}.comment-section .save-comment:disabled{opacity:.6;cursor:not-allowed}.comment-feedback{margin:0;font-size:.85rem}.comment-feedback.error{color:#b91c1c}.comment-feedback.warning{color:#b45309}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.intro-page{width:100%;display:flex;justify-content:center;padding:24px}.intro-card{width:min(640px,100%);background:#fff;border-radius:18px;padding:32px;box-shadow:0 20px 40px #0f172a14;border:1px solid #e5e7eb}.intro-card h1{font-size:2rem;margin-top:0}.intro-card p{color:#4b5563;line-height:1.6}.intro-card h1,.intro-card h2{text-align:center}.consent-checkbox{display:flex;align-items:center;gap:8px;margin:24px 0;font-weight:500;color:#111827}.familiarity-scale{margin-bottom:16px;text-align:left}.familiarity-scale p{margin-bottom:8px;font-weight:600}.scale-options{display:flex;justify-content:center;gap:12px}.scale-options label{display:flex;align-items:center;gap:4px;font-weight:500}.intro-card button{width:100%;text-align:center}