*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#f8f9fa;--color-surface:#fff;--color-border:#e2e5e9;--color-text:#1a1d21;--color-text-secondary:#5e6369;--color-text-muted:#9ea3a8;--color-primary:#0d9668;--color-primary-hover:#0a7b55;--color-primary-light:#e6f5ef;--color-primary-text:#065f42;--color-user-bubble:#0d9668;--color-assistant-bubble:#eef0f2;--color-error-bg:#fef2f2;--color-error-text:#b91c1c;--color-tree-line:#cdd1d6;--sidebar-width:280px;--header-height:56px;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-full:9999px}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;color:var(--color-text);background:var(--color-bg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}body{min-height:100dvh}.app-layout{height:100dvh;display:flex}.sidebar{width:var(--sidebar-width);border-right:1px solid 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16px;font-size:14px;line-height:1.6}.message-bubble--user{background:var(--color-user-bubble);color:#fff}.message-bubble--assistant{background:var(--color-assistant-bubble);color:var(--color-text)}.message-actions{align-items:center;gap:8px;margin-top:4px;display:flex}.message-row--user .message-actions{justify-content:flex-end}.fork-btn{color:var(--color-text-muted);border-radius:var(--radius-sm);cursor:pointer;background:0 0;border:1px solid #0000;padding:2px 8px;font-size:11px;transition:all .12s}.fork-btn:hover{color:var(--color-primary-text);background:var(--color-primary-light);border-color:var(--color-border)}.fork-btn:disabled{opacity:.5;cursor:default}.fork-point-markers{flex-direction:column;gap:4px;margin:6px 0;padding:0 4px;display:flex}.fork-point-marker{border-radius:var(--radius-full);border:1px solid #0000;align-items:center;gap:5px;width:fit-content;padding:4px 10px;font-size:11px;text-decoration:none;transition:background .15s,border-color 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