:root{--bg: #faf8f5;--panel: #ffffff;--panel-alt: #f5f3f0;--border: #e8e4df;--text: #1a1a1a;--text-dim: #8a8a8a;--accent: #f28c28;--accent-light: #fef4ea;--user-bg: #1a1a1a;--assistant-bg: #ffffff;--error: #e54d4d;--shadow: 0 1px 3px rgba(0, 0, 0, .06);--shadow-md: 0 2px 8px rgba(0, 0, 0, .08)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.6}.app{display:flex;height:100vh}.sidebar{width:260px;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:12px}.new-btn{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:10px 12px;cursor:pointer;font-weight:600;margin-bottom:12px;transition:filter 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