:root{--bg-primary: #ffffff;--bg-secondary: #f7f8fa;--bg-tertiary: #f0f1f3;--bg-elevated: #e8eaed;--bg-hover: #ecedf0;--border-subtle: rgba(0, 0, 0, .06);--border-default: rgba(0, 0, 0, .1);--border-strong: rgba(0, 0, 0, .15);--text-primary: #1a1a2e;--text-secondary: #5f6368;--text-tertiary: #9aa0a6;--text-inverse: #ffffff;--accent: #6c5ce7;--accent-hover: #7d6ff0;--accent-subtle: rgba(108, 92, 231, .08);--accent-glow: rgba(108, 92, 231, .2);--success: #00b894;--warning: #fdcb6e;--error: #e74c3c;--info: #0984e3;--terminal-bg: #1e1e2e;--terminal-text: #cdd6f4;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", "SF Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--sidebar-width: 272px;--tool-panel-width: 440px;--tool-panel-min: 320px;--tool-panel-max: 700px;--header-height: 52px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--ease-out: cubic-bezier(.16, 1, .3, 1);--transition-fast: .15s var(--ease-out);--transition-normal: .25s var(--ease-out);--transition-slow: .35s var(--ease-out)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);height:100vh;overflow:hidden;-webkit-font-smoothing:antialiased}#root{height:100%}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#0000001f;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#0003}.app-container{display:flex;height:100vh;width:100%;background:var(--bg-primary);overflow:hidden}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);height:100%;background:var(--bg-secondary);border-right:1px solid var(--border-subtle);display:flex;flex-direction:column;transition:width var(--transition-slow),min-width var(--transition-slow),opacity var(--transition-normal),transform var(--transition-slow);overflow:visible;z-index:1200}.sidebar.collapsed{width:0;min-width:0;border-right:none;opacity:0;transform:translate(-16px);pointer-events:none;overflow:hidden}.sidebar-header{display:flex;align-items:center;justify-content:flex-start;padding:0 12px;height:56px;border-bottom:1px solid var(--border-subtle);flex-shrink:0;position:relative}.sidebar-brand{display:flex;min-width:0;flex:1;align-items:center;justify-content:flex-start;gap:8px;color:var(--text-primary);white-space:nowrap}.sidebar-brand-icon{width:36px;height:36px;border-radius:12px;background:#18181b;color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}.sidebar-brand-title{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px;font-weight:700;letter-spacing:-.01em;color:#09090b}.sidebar-toggle{width:36px;height:36px;border:none;background:transparent;color:#71717a;cursor:pointer;border-radius:12px;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);flex-shrink:0;margin-left:auto}.sidebar-toggle:hover{background:#f4f4f5;color:#09090b}.sidebar-actions{display:flex;flex-direction:column;gap:8px;padding:10px;flex-shrink:0}.sidebar-newchat-btn,.sidebar-checkin-btn{width:100%}.sidebar-newchat-btn{order:-1}.sidebar-list{flex:1;overflow-y:auto;padding:4px 10px 16px}.sidebar-date-group{margin-bottom:2px}.sidebar-date-label{font-size:10px;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.06em;padding:8px 8px 4px}.sidebar-item{padding:9px 10px;border-radius:6px;cursor:pointer;font-size:13px;color:var(--text-secondary);transition:all var(--transition-fast);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:flex;align-items:center;gap:8px;position:relative}.sidebar-item:hover{background:var(--bg-hover);color:var(--text-primary)}.sidebar-item.active{background:var(--accent-subtle);color:var(--accent);font-weight:500}.sidebar-item-icon{font-size:13px;flex-shrink:0;opacity:.5}.sidebar-item-text{overflow:hidden;text-overflow:ellipsis;flex:1}.sidebar-item-delete{opacity:0;width:22px;height:22px;border:none;background:transparent;color:var(--text-tertiary);cursor:pointer;border-radius:4px;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all var(--transition-fast);font-size:12px}.sidebar-item:hover 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20px;border-bottom:none;background:transparent;flex-shrink:0;gap:12px;overflow:visible;pointer-events:none;overflow:hidden}.chat-header-left{display:flex;align-items:center;gap:10px;min-width:0;flex-shrink:1;overflow:visible;pointer-events:auto}.usage-notice-btn{height:34px;border-radius:8px;border:1px solid var(--border-default);background:#fffffff0;color:var(--text-primary);padding:0 12px;font-size:13px;font-weight:600;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap}.sidebar-logo-btn{border:0;background:transparent;padding:0;cursor:pointer;color:inherit;line-height:1}.sidebar-logo-text{display:inline-block;font-size:44px;font-weight:900;letter-spacing:-.03em;line-height:1}.usage-notice-btn:hover{border-color:var(--accent);background:var(--accent-subtle)}.check-in-btn{height:34px;border-radius:8px;border:1px solid #d1d5db;background:#fff;color:#111827;padding:0 12px;font-size:13px;font-weight:600;cursor:pointer;transition:all .15s 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#0000001f;padding:4px;display:flex;flex-direction:column;gap:2px}.model-switcher-item{border:none;background:transparent;color:var(--text-secondary);padding:8px 10px;border-radius:8px;cursor:pointer;font-size:13px;text-align:left;display:flex;align-items:center;justify-content:space-between;gap:10px}.model-switcher-item:hover{background:var(--bg-secondary);color:var(--text-primary)}.model-switcher-item.active{color:var(--text-primary)}.model-switcher-item.active svg{color:var(--text-primary)}.model-switcher-brand,.model-switcher-sub{display:none}.provider-select{padding:4px 8px;font-size:12px;border-radius:6px;border:1px solid var(--border-default);background:var(--bg-secondary);color:var(--text-secondary);cursor:pointer;outline:none;font-family:Inter,sans-serif;transition:all var(--transition-fast);position:relative}.provider-select:hover{border-color:var(--accent);color:var(--text-primary)}.process-step-body{padding:10px 12px;background:#00000005;border-top:1px solid 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