:root{--bg: #f6f7fb;--surface: #ffffff;--border: #e6e8f0;--text: #1f2333;--text-muted: #6b7280;--accent-1: #6366f1;--accent-2: #8b5cf6;--accent-3: #ec4899;--accent-grad: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);--ai-bubble: #ffffff;--user-bubble: linear-gradient(135deg, #6366f1, #8b5cf6);--radius: 16px;--shadow-sm: 0 1px 2px rgba(16, 24, 40, .06);--shadow-md: 0 8px 24px rgba(99, 102, 241, .12)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Arial,sans-serif;color:var(--text);background:radial-gradient(1200px 600px at 10% -10%,rgba(99,102,241,.1),transparent 60%),radial-gradient(1000px 500px at 100% 0%,rgba(236,72,153,.08),transparent 55%),var(--bg);-webkit-font-smoothing:antialiased}.app{display:flex;height:100%;width:100%}.sidebar{flex:none;width:264px;height:100%;background:#fff;border-right:1px solid 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ease}.sidebar.open{transform:translate(0)}.sidebar-backdrop{display:block;position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;background:#0f172a66}.main{padding:0 14px}}@media(max-width:640px){.mode-selector{grid-template-columns:1fr}.bubble{max-width:88%}}