:root{--color-primary: #667eea;--color-primary-dark: #764ba2}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:linear-gradient(135deg,var(--color-primary),var(--color-primary-dark));min-height:100vh;color:#333}.app-shell{max-width:900px;margin:0 auto;padding:20px}.app-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:20px 30px;border-radius:20px;margin-bottom:20px;display:flex;justify-content:space-between;align-items:center}.app-header h1{font-size:1.5em}.app-main{background:#fff;border-radius:20px;padding:30px;box-shadow:0 20px 60px #0000004d}.tutor-chat{display:flex;flex-direction:column;gap:16px}.tutor-chat-body{display:flex;flex-direction:column;gap:12px}.tutor-status-bar{display:flex;align-items:center;gap:10px;padding:10px 14px;background:#f3f4f6;border-radius:10px;font-size:13px;color:#374151}.tutor-status-bar.ready{background:#ecfdf5}.tutor-status-bar.fallback{background:#fffbeb}.tutor-status-dot{width:8px;height:8px;border-radius:50%;background:#9ca3af}.tutor-status-bar.ready .tutor-status-dot{background:#10b981}.tutor-status-bar.fallback .tutor-status-dot{background:#f59e0b}.tutor-status-text{flex:1}.tutor-status-chip{font-size:11px;font-weight:600;padding:2px 8px;border-radius:999px;background:#e0e7ff;color:#4338ca}.tutor-messages{display:flex;flex-direction:column;gap:14px;min-height:320px;max-height:52vh;overflow-y:auto;padding:4px}.tutor-msg-system{text-align:center;font-size:13px;color:#6b7280;padding:8px;background:#f9fafb;border-radius:10px}.tutor-msg{display:flex;gap:10px;align-items:flex-start}.tutor-msg.user{flex-direction:row-reverse}.tutor-msg-avatar{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:#eef2ff;font-size:17px;flex-shrink:0}.tutor-msg.user .tutor-msg-avatar{background:#667eea}.tutor-msg-body{max-width:78%}.tutor-msg.user .tutor-msg-body{display:flex;flex-direction:column;align-items:flex-end}.tutor-msg-text{padding:10px 14px;border-radius:14px;background:#f3f4f6;color:#1f2937;font-size:14px;line-height:1.55;white-space:pre-wrap;word-break:break-word}.tutor-msg.user .tutor-msg-text{background:#667eea;color:#fff}.tutor-msg-time{font-size:11px;color:#9ca3af;margin-top:4px;padding:0 4px}.tutor-typing{display:flex;gap:4px;padding:14px;background:#f3f4f6;border-radius:14px}.tutor-typing span{width:6px;height:6px;border-radius:50%;background:#9ca3af;animation:tutor-blink 1.2s infinite}.tutor-typing span:nth-child(2){animation-delay:.2s}.tutor-typing span:nth-child(3){animation-delay:.4s}@keyframes tutor-blink{0%,80%,to{opacity:.3}40%{opacity:1}}.tutor-sources{border:1px solid #e5e7eb;border-radius:12px;padding:12px;background:#f9fafb}.tutor-sources-header{font-size:12px;font-weight:700;color:#374151;margin-bottom:8px}.tutor-source{padding:8px 0;border-top:1px solid #e5e7eb}.tutor-source:first-of-type{border-top:none;padding-top:0}.tutor-source-title{font-size:13px;font-weight:600;color:#111827;display:flex;justify-content:space-between;gap:8px}.tutor-source-score{color:#667eea;font-weight:700}.tutor-source-excerpt{font-size:12px;color:#6b7280;margin-top:3px}.tutor-source-link{font-size:12px;color:#4f46e5;text-decoration:none;font-weight:600}.tutor-chat-actions{display:flex;justify-content:flex-end}.tutor-input-row{display:flex;gap:8px}.tutor-input{flex:1;padding:12px 14px;border:1px solid #d1d5db;border-radius:10px;font-size:14px;font-family:inherit;resize:none;outline:none;width:100%}.tutor-input:focus{border-color:#667eea;box-shadow:0 0 0 3px #667eea26}.tutor-send{padding:12px 18px;border:none;border-radius:10px;background:#667eea;color:#fff;font-size:14px;font-weight:600;cursor:pointer;white-space:nowrap}.tutor-send:disabled{opacity:.5;cursor:not-allowed}.tutor-settings{font-size:13px}.tutor-settings-toggle{background:none;border:none;color:#6b7280;font-size:12px;cursor:pointer;padding:4px;text-decoration:underline}.tutor-settings-body{display:flex;flex-direction:column;gap:8px;margin-top:8px;padding:12px;border:1px dashed #d1d5db;border-radius:10px;background:#fafafa}.tutor-settings-body label{font-size:11px;font-weight:700;color:#6b7280}.tutor-settings-row{display:flex;gap:8px}.tutor-settings-status{font-size:12px;color:#374151}.tutor-feedback{display:flex;align-items:center;gap:6px;margin-top:8px;flex-wrap:wrap;font-size:12px;color:#6b7280}.tutor-feedback-label{font-size:11px}.tutor-feedback-btn{background:none;border:1px solid #d1d5db;border-radius:6px;padding:3px 8px;font-size:13px;cursor:pointer}.tutor-feedback-btn:hover{background:#f3f4f6}.tutor-feedback-comment{display:flex;gap:6px;width:100%;margin-top:4px}.tutor-resources{margin-top:8px;border:1px solid #e5e7eb;border-radius:10px;padding:8px 10px;background:#fff}.tutor-resources-toggle{display:flex;justify-content:space-between;font-size:12px;font-weight:600;color:#374151;cursor:pointer;-webkit-user-select:none;user-select:none}.tutor-resource{display:flex;align-items:center;gap:8px;margin-top:6px;font-size:12px;min-width:0}.tutor-resource-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#111827}.tutor-resource-score{color:#667eea;font-weight:700;font-size:11px}.tutor-resource-link{color:#4f46e5;text-decoration:none;font-weight:700}.tutor-resources-more{font-size:11px;color:#6b7280;margin-top:5px}.tutor-followup{display:flex;align-items:center;gap:6px;margin-top:8px;flex-wrap:wrap}.tutor-followup-label{font-size:11px;color:#6b7280;font-weight:600}.tutor-followup-btn{background:#fff;border:1px solid #d1d5db;border-radius:999px;padding:4px 10px;font-size:11px;cursor:pointer;color:#374151}.tutor-followup-btn:hover{background:#f3f4f6;border-color:#667eea}