body{margin:0;min-width:320px;min-height:100vh}#root{min-height:100vh}:root{--primary-color: #3b82f6;--secondary-color: #10b981;--background: #f9fafb;--surface: #ffffff;--text: #111827;--text-secondary: #6b7280;--border: #e5e7eb;--shadow: 0 1px 3px 0 rgb(0 0 0 / .1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:var(--background);color:var(--text);line-height:1.6}.app{min-height:100vh;padding:2rem}.header{max-width:1200px;margin:0 auto 2rem;text-align:center}.header h1{font-size:2.5rem;font-weight:700;color:var(--text);margin-bottom:.5rem}.header p{color:var(--text-secondary);font-size:1.1rem}.container{max-width:1200px;margin:0 auto}.user-selection{background:var(--surface);padding:2rem;border-radius:12px;box-shadow:var(--shadow);margin-bottom:2rem}.user-selection h2{margin-bottom:1.5rem;color:var(--text)}.user-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem}.user-card{padding:1.5rem;border:2px solid var(--border);border-radius:8px;cursor:pointer;transition:all .2s;background:var(--surface)}.user-card:hover{transform:translateY(-2px);box-shadow:0 4px 6px -1px #0000001a}.user-card.active{border-width:3px;box-shadow:0 4px 6px -1px #0000001a}.user-card h3{font-size:1.25rem;margin-bottom:.5rem}.user-card p{color:var(--text-secondary);font-size:.9rem}.controls{background:var(--surface);padding:1.5rem;border-radius:12px;box-shadow:var(--shadow);margin-bottom:2rem}.controls-row{display:flex;gap:1rem;flex-wrap:wrap;align-items:center}.search-box{flex:1;min-width:250px}.search-box input{width:100%;padding:.75rem 1rem;border:2px solid var(--border);border-radius:8px;font-size:1rem;transition:border-color .2s}.search-box input:focus{outline:none;border-color:var(--primary-color)}.filter-select{padding:.75rem 1rem;border:2px solid var(--border);border-radius:8px;font-size:1rem;background:var(--surface);cursor:pointer;min-width:150px}.filter-select:focus{outline:none;border-color:var(--primary-color)}.btn{padding:.75rem 1.5rem;border:none;border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover{background-color:#2563eb}.btn-secondary{background-color:var(--secondary-color);color:#fff}.btn-secondary:hover{background-color:#059669}.stats{display:flex;gap:1rem;margin-bottom:1rem;flex-wrap:wrap}.stat-card{background:var(--background);padding:1rem;border-radius:8px;flex:1;min-width:150px}.stat-card strong{display:block;font-size:1.5rem;color:var(--primary-color)}.stat-card span{font-size:.9rem;color:var(--text-secondary)}.questions-grid{display:grid;gap:1.5rem}.question-card{background:var(--surface);padding:1.5rem;border-radius:12px;box-shadow:var(--shadow);transition:box-shadow .2s}.question-card:hover{box-shadow:0 4px 6px -1px #0000001a}.question-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:1rem;flex-wrap:wrap;gap:.5rem}.question-meta{display:flex;gap:.5rem;flex-wrap:wrap}.badge{padding:.25rem .75rem;border-radius:12px;font-size:.875rem;font-weight:500}.badge-category{background-color:#dbeafe;color:#1e40af}.badge-type{background-color:#fef3c7;color:#92400e}.badge-round{background-color:#e0e7ff;color:#3730a3}.question-text{font-size:1.1rem;line-height:1.7;margin-bottom:1rem;color:var(--text)}.multiple-choice{margin:1rem 0}.choice{padding:.75rem;margin-bottom:.5rem;border:2px solid var(--border);border-radius:6px;background:var(--background)}.choice strong{margin-right:.5rem;color:var(--primary-color)}.answer-section{margin-top:1rem;padding-top:1rem;border-top:2px solid var(--border)}.answer-section strong{display:block;margin-bottom:.5rem;color:var(--secondary-color)}.answer-text{color:var(--text);font-weight:500}.loading{text-align:center;padding:4rem;color:var(--text-secondary);font-size:1.25rem}.no-questions{text-align:center;padding:4rem;background:var(--surface);border-radius:12px;box-shadow:var(--shadow)}.no-questions h3{color:var(--text);margin-bottom:.5rem}.no-questions p{color:var(--text-secondary)}@media (max-width: 768px){.app{padding:1rem}.header h1{font-size:2rem}.controls-row{flex-direction:column;align-items:stretch}.filter-select,.btn{width:100%}}