:root{--bg: #fafaf8;--panel: #ffffff;--sidebar: #f2f0ea;--border: #e5e3dd;--text: #2d2a26;--muted: #8a857c;--accent: #d9622b;--accent-dark: #c05420;--user-bubble: #ece9e2;--code-bg: #2b2925}*{box-sizing:border-box}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text)}.app{display:flex;height:100vh}.sidebar{width:250px;background:var(--sidebar);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:12px}.new-chat{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:10px;font-size:14px;cursor:pointer;text-align:left;margin-bottom:12px}.new-chat:hover{border-color:var(--accent)}.conv-list{flex:1;overflow-y:auto}.conv-item{display:flex;align-items:center;justify-content:space-between;gap:6px;padding:8px 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.conv-menu{visibility:visible}.conv-menu:hover{background:var(--border);color:var(--text)}.menu-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:60}.ctx-menu{position:fixed;z-index:61;width:190px;background:#fff;border:1px solid var(--border);border-radius:12px;box-shadow:0 8px 28px #00000021;padding:6px;display:flex;flex-direction:column}.ctx-menu button{border:none;background:transparent;text-align:left;padding:9px 10px;border-radius:8px;font-size:13.5px;cursor:pointer;color:var(--text)}.ctx-menu button:hover{background:var(--user-bubble)}.ctx-menu button.danger{color:#b03030}.ctx-menu button.danger:hover{background:#fdecec}.field select{border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-size:14px;font-family:inherit;color:var(--text);background:#fff;max-width:480px}.field 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