*{margin:0;padding:0;box-sizing:border-box}:root{--bg: #f8f9fa;--bg-dark: #1a1a2e;--sidebar-bg: #ffffff;--chat-bg: #ffffff;--artifact-bg: #ffffff;--border: #e2e8f0;--text: #1e293b;--text-muted: #64748b;--primary: #6366f1;--primary-hover: #4f46e5;--user-msg: #eff6ff;--assistant-msg: #f8fafc;--tool-bg: #fef3c7;--tool-border: #f59e0b;--error-bg: #fef2f2;--error-border: #ef4444;--success: #10b981;--radius: 8px;--sidebar-width: 260px;--artifact-width: 340px;--mobile-topbar-height: 48px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);height:100vh;overflow:hidden}#root{height:100vh}.app{display:grid;grid-template-columns:var(--sidebar-width) 1fr var(--artifact-width);grid-template-rows:1fr;height:100vh;overflow:hidden}.app.artifact-hidden{grid-template-columns:var(--sidebar-width) 1fr}.mobile-topbar,.sidebar-overlay{display:none}.show-artifact-btn{position:fixed;right:8px;top:8px;z-index:10;background:#fff;border:1px solid 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var(--border);color:var(--text-muted);cursor:pointer;font-size:18px;width:28px;height:28px;border-radius:6px;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all .15s ease}.artifact-close-btn:hover{background:var(--error-bg);border-color:var(--error-border);color:var(--error-border)}.artifact-content-body{padding:16px;white-space:pre-wrap;word-break:break-word;overflow-y:auto;flex:1;min-height:0}.artifact-empty{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-muted);font-size:13px;padding:16px;text-align:center}.loading{display:flex;align-items:center;justify-content:center;padding:40px;color:var(--text-muted)}.error-banner{padding:8px 16px;background:var(--error-bg);border:1px solid var(--error-border);border-radius:var(--radius);color:#991b1b;font-size:13px;margin:8px 20px}@media(max-width:1024px){.app,.app.artifact-hidden{grid-template-columns:var(--sidebar-width) 1fr}.artifact-panel{position:fixed;top:0;right:0;bottom:0;width:min(380px,85vw);z-index:100;box-shadow:-4px 0 24px #0000001f;border-left:1px solid var(--border)}}@media(max-width:768px){.app{grid-template-columns:1fr;grid-template-rows:var(--mobile-topbar-height) 1fr}.app.artifact-hidden{grid-template-columns:1fr}.mobile-topbar{display:flex;align-items:center;justify-content:space-between;padding:0 12px;height:var(--mobile-topbar-height);background:#fff;border-bottom:1px solid var(--border);z-index:50}.mobile-menu-btn{background:none;border:none;font-size:22px;cursor:pointer;color:var(--text);padding:4px 8px}.mobile-topbar-title{font-size:15px;font-weight:600;color:var(--primary)}.mobile-artifact-btn{background:none;border:none;font-size:18px;cursor:pointer;color:var(--text-muted);padding:4px 8px}.sidebar{position:fixed;top:0;left:-100%;bottom:0;width:min(280px,80vw);z-index:200;transition:left .25s ease;box-shadow:4px 0 24px #0000001f}.app.sidebar-open .sidebar{left:0}.sidebar-overlay{display:block;position:fixed;top:0;left:0;right:0;bottom:0;background:#00000059;z-index:199}.chat-panel{height:calc(100vh - var(--mobile-topbar-height));border-right:none}.chat-messages{padding:12px}.chat-input-area{padding:10px 12px}.message{max-width:100%}.artifact-panel{position:fixed;top:0;right:0;bottom:0;width:100vw;z-index:150;box-shadow:none}.show-artifact-btn{display:none}.chat-send-btn{padding:10px 14px}}@media(max-width:380px){.chat-input-area{padding:8px}.chat-input,.chat-send-btn{padding:8px 10px;font-size:13px}.message-content{padding:10px 12px;font-size:13px}}