:root{color:#172033;background:#eef3f7;font-family:Inter,Segoe UI,Microsoft YaHei,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}a{color:inherit}button,input,textarea{font:inherit}button{cursor:pointer}.app-shell{display:flex;flex-direction:column;min-height:100vh}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 28px;background:#fffffff0;border-bottom:1px solid #d8e0e7;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:8px;background:#2563eb;color:#fff;font-weight:800}.brand strong{display:block;font-size:19px;line-height:1.2}.eyebrow{display:block;margin:0 0 4px;color:#2563eb;font-size:12px;font-weight:800;letter-spacing:0;text-transform:uppercase}.nav-actions{display:flex;align-items:center;gap:10px}.user-chip{max-width:260px;overflow:hidden;color:#475569;font-size:14px;text-overflow:ellipsis;white-space:nowrap}.ghost-button,.primary-button,.icon-button{min-height:42px;border:0;border-radius:7px;font-weight:800}.ghost-button{display:inline-flex;align-items:center;justify-content:center;padding:0 16px;border:1px solid #cbd5e1;background:#fff;color:#1f2937;text-decoration:none}.primary-button{padding:0 20px;background:#2563eb;color:#fff}.primary-button:disabled{cursor:not-allowed;background:#94a3b8}.icon-button{width:40px;background:#e8efff;color:#1d4ed8;font-size:22px}.page-fade-enter-active,.page-fade-leave-active{transition:opacity .24s ease,transform .24s ease}.page-fade-enter-from,.page-fade-leave-to{opacity:0;transform:translateY(8px)}.chat-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:18px;width:min(1280px,calc(100vw - 32px));min-height:calc(100vh - 75px);margin:0 auto;padding:18px 0}.history-sidebar,.conversation-area,.auth-panel{border:1px solid #d8e0e7;border-radius:8px;background:#fff;box-shadow:0 18px 55px #0f172a14}.history-sidebar{min-height:0;padding:16px}.sidebar-header{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}.sidebar-header h2{margin:0;font-size:18px}.sidebar-empty{margin:20px 0 0;color:#64748b;line-height:1.7}.conversation-list{display:grid;gap:8px;margin:0;padding:0;list-style:none}.conversation-list li{display:grid;grid-template-columns:1fr 34px;gap:6px}.conversation-list button{min-width:0;border:0;border-radius:7px}.conversation-list li>button:first-child{display:grid;gap:5px;padding:10px;text-align:left;background:#f5f8fb;color:#172033}.conversation-list li>button:first-child.active{background:#dbeafe;color:#1d4ed8}.conversation-list span{overflow:hidden;font-weight:800;text-overflow:ellipsis;white-space:nowrap}.conversation-list small{color:#64748b}.delete-button{background:#fff1f2;color:#be123c;font-size:18px}.conversation-area{display:grid;grid-template-rows:1fr auto;min-width:0;min-height:calc(100vh - 111px)}.chat-pane{overflow-y:auto;min-height:0;padding:20px 20px 8px}.empty-state{padding:52px 10px;color:#4b5563}.empty-state h1{margin:0 0 10px;color:#111827;font-size:30px;line-height:1.25}.empty-state p{max-width:650px;margin:0;line-height:1.8}.message{margin-bottom:14px;padding:16px;border:1px solid #d8e0e7;border-radius:8px;background:#fff}.message-user{margin-left:auto;max-width:760px;border-color:#c7d2fe;background:#f8fbff}.message-assistant{max-width:920px}.message-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px;color:#4b5563;font-size:13px;font-weight:800}.message-content{margin:0;white-space:pre-wrap;line-height:1.75}.risk-badge{flex:0 0 auto;min-width:64px;padding:5px 8px;border-radius:999px;text-align:center;font-size:12px}.risk-low{color:#047857;background:#d1fae5}.risk-medium{color:#92400e;background:#fef3c7}.risk-high{color:#b45309;background:#ffedd5}.risk-emergency{color:#b91c1c;background:#fee2e2}.risk-unknown{color:#4b5563;background:#e5e7eb}.loading-row{display:flex;align-items:center;gap:10px;padding:12px 0;color:#4b5563}.loader{width:18px;height:18px;border:3px solid #cbd5e1;border-top-color:#2563eb;border-radius:50%;animation:spin .9s linear infinite}.error-message{margin:10px 0;padding:12px;border-radius:6px;color:#991b1b;background:#fee2e2}.composer{display:grid;grid-template-columns:1fr 112px;gap:12px;padding:14px;border-top:1px solid #d8e0e7;background:#fff}.composer textarea{min-height:78px;max-height:180px;resize:vertical;border:1px solid #cbd5e1;border-radius:7px;padding:12px;line-height:1.6}.composer textarea:focus,.auth-form input:focus{outline:2px solid #93c5fd;border-color:#2563eb}.auth-layout{display:grid;place-items:center;min-height:calc(100vh - 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20px,1280px);padding:10px 0}.composer{grid-template-columns:1fr}.primary-button{min-height:46px}}