:root{--primary:#4f46e5;--primary-hover:#4338ca;--primary-light:#e0e7ff;--bg-body:#f5f5f5;--bg-panel:#fff;--bg-sidebar:#1a1a2e;--bg-message-ai:#f0f4ff;--bg-message-user:#e8f5e9;--bg-input:#fff;--text-primary:#1a1a1a;--text-secondary:#6b7280;--text-on-dark:#fff;--text-on-primary:#fff;--border:#e5e7eb;--success:#10b981;--warning:#f59e0b;--error:#ef4444;--info:#3b82f6;--progress-active:#4f46e5;--progress-done:#10b981;--progress-pending:#d1d5db}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{color:var(--text-primary);background:var(--bg-body);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans SC,sans-serif;font-size:15px;line-height:1.6}#app{height:100%}pre,code{font-family:SF Mono,Fira Code,Consolas,Monaco,monospace;font-size:13px}button,input,textarea{font-family:inherit}.hidden{display:none!important}.app-layout{flex-direction:column;height:100%;display:flex}.main-area{flex:1;min-height:0;display:flex;position:relative}.dual-panel{flex:1;grid-template-columns:55% 45%;min-width:0;min-height:0;display:grid}.left-panel{border-right:1px solid var(--border);background:#fafafa;flex-direction:column;min-width:0;min-height:0;display:flex}.right-panel{background:var(--bg-panel);border-left:1px solid var(--border);flex-direction:column;min-width:0;min-height:0;display:flex}@media (width<=1023px){.dual-panel{grid-template-rows:40vh 1fr;grid-template-columns:1fr}.right-panel{border-left:none;border-bottom:1px solid var(--border);order:1}.left-panel{border-right:none;order:2}}.progress-bar{border-bottom:1px solid var(--border);background:#fff;flex-shrink:0;justify-content:center;align-items:center;gap:8px;height:40px;padding:0 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14px;line-height:1.5}.message.user{background:var(--bg-message-user);align-self:flex-end}.message.assistant{background:var(--bg-message-ai);align-self:flex-start}.message.assistant p:last-child{margin-bottom:0}.message.system{color:var(--text-secondary);opacity:.7;text-align:center;background:0 0;align-self:center;max-width:90%;font-size:12px}.message.streaming:after{content:"▊";margin-left:2px;animation:1s step-end infinite blink}@keyframes blink{50%{opacity:0}}.message-list-empty{height:100%;color:var(--text-secondary);text-align:center;justify-content:center;align-items:center;padding:40px;font-size:14px;display:flex}.reconnect-hint{color:var(--text-secondary);align-self:center;padding:4px 12px;font-size:12px}.message-error{color:var(--error);background:#fef2f2;border:1px solid #fecaca;align-self:flex-start;font-size:13px}.chat-input-area{border-top:1px solid var(--border);background:var(--bg-input);flex-shrink:0;gap:10px;padding:12px 16px;display:flex}.chat-input-area textarea{border:1px solid var(--border);resize:none;border-radius:8px;outline:none;flex:1;min-height:40px;max-height:120px;padding:10px 14px;font-family:inherit;font-size:14px;line-height:1.5}.chat-input-area textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.chat-input-area button{background:var(--primary);width:70px;color:var(--text-on-primary);cursor:pointer;border:none;border-radius:8px;font-size:14px;transition:background .15s}.chat-input-area button:hover{background:var(--primary-hover)}.chat-input-area button:disabled{opacity:.5;cursor:not-allowed}.send-error-hint{color:var(--error);align-self:center;font-size:12px}.artifact-header{border-bottom:1px solid var(--border);height:40px;color:var(--text-primary);flex-shrink:0;align-items:center;padding:0 16px;font-size:13px;font-weight:600;display:flex}.artifact-content{flex:1;min-height:0;padding:24px 28px;line-height:1.8;overflow-y:auto}.artifact-content h1{margin:.8em 0 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.session-item{cursor:pointer;opacity:.85;border-radius:6px;flex-direction:column;gap:2px;padding:10px 12px;font-size:14px;display:flex;position:relative}.sidebar .session-item:hover{background:#ffffff1a}.sidebar .session-item.active{opacity:1;background:#4f46e54d}.sidebar .session-item .title{white-space:nowrap;text-overflow:ellipsis;padding-right:20px;overflow:hidden}.sidebar .session-item .meta{opacity:.6;font-size:11px}.sidebar .session-item .delete-btn{color:var(--text-on-dark);cursor:pointer;opacity:0;background:0 0;border:none;border-radius:4px;padding:2px 6px;font-size:16px;transition:opacity .15s;position:absolute;top:50%;right:8px;transform:translateY(-50%)}.sidebar .session-item:hover .delete-btn{opacity:.7}.sidebar .session-item .delete-btn:hover{opacity:1;background:#ef44444d}.sidebar .session-item .status-tag{border-radius:8px;align-self:flex-start;padding:1px 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(width>=1024px){.sidebar-overlay{display:none!important}}.login-overlay{z-index:1000;background:var(--bg-body);justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.login-card{background:var(--bg-panel);border:1px solid var(--border);border-radius:10px;flex-direction:column;gap:12px;width:100%;max-width:320px;padding:32px 28px;display:flex;box-shadow:0 4px 24px #00000014}.login-title{text-align:center;color:var(--primary);margin:0;font-size:22px;font-weight:600}.login-subtitle{color:var(--text-secondary);text-align:center;margin:0 0 4px;font-size:13px}.login-card #login-password{border:1px solid var(--border);background:var(--bg-input);width:100%;height:38px;color:var(--text-primary);border-radius:6px;padding:0 12px;font-size:14px}.login-card #login-password:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 3px #4f46e526}.login-card #login-submit-btn{background:var(--primary);width:100%;height:38px;color:var(--text-on-primary);cursor:pointer;border:none;border-radius:6px;font-size:14px;font-weight:500}.login-card #login-submit-btn:hover:not(:disabled){background:var(--primary-hover)}.login-card #login-submit-btn:disabled{opacity:.6;cursor:not-allowed}.login-error{min-height:18px;color:var(--error);text-align:center;font-size:13px}