:root{--bg-primary: #0d1117;--bg-secondary: #161b22;--bg-surface: #21262d;--bg-hover: #30363d;--text-primary: #c9d1d9;--text-secondary: #8b949e;--text-muted: #484f58;--accent: #58a6ff;--accent-dim: rgba(88, 166, 255, .12);--success: #3fb950;--warning: #d29922;--error: #f85149;--border: #21262d;--border-subtle: #30363d;--radius-sm: 4px;--radius-md: 6px;--radius-lg: 8px;--shadow: 0 1px 4px rgba(0, 0, 0, .3);--transition: .15s ease;--font: -apple-system, BlinkMacSystemFont, "Segoe UI Variable", "SF Pro Text", system-ui, sans-serif;--font-mono: "Cascadia Code", "Fira Code", "Consolas", "SF Mono", monospace;--sidebar-width: 248px}.nav-icon{width:18px;height:18px;filter:brightness(0) invert(1)}.file-icon{width:22px;height:22px;filter:brightness(0) invert(1)}.ui-icon{width:18px;height:18px;filter:brightness(0) invert(1)}[data-theme=light] .nav-icon,[data-theme=light] .file-icon,[data-theme=light] .ui-icon{filter:invert(23%) sepia(91%) saturate(2467%) hue-rotate(217deg) brightness(92%) contrast(94%)}[data-theme=light]{--bg-primary: #fafafa;--bg-secondary: #ffffff;--bg-surface: #f1f5f9;--bg-hover: #e2e8f0;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #64748b;--accent: #2563eb;--accent-dim: rgba(37, 99, 235, .12);--success: #16a34a;--warning: #d97706;--error: #dc2626;--border: #e2e8f0;--border-subtle: #cbd5e1}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%;width:100%;overflow:hidden}body{font-family:var(--font);background:var(--bg-primary);color:var(--text-primary);font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-subtle);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes uploading-pulse{0%,to{opacity:1}50%{opacity:.45}}.is-uploading{animation:uploading-pulse 1.4s ease-in-out infinite}@keyframes 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var(--transition)}.message-attachment-card:hover{background:var(--bg-hover);border-color:var(--border)}.message-attachment-icon{width:18px;height:18px;flex-shrink:0}.message-attachment-meta{display:flex;flex-direction:column;min-width:0;flex:1;text-align:left}.message-attachment-name{font-size:12px;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.message-attachment-type{font-size:11px;color:var(--text-muted);margin-top:1px}.message-attachment-download{width:13px;height:13px;opacity:.85}.copy-btn{display:inline-flex;align-items:center;gap:5px;padding:4px 8px;background:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:11px;font-family:var(--font);cursor:pointer;transition:background var(--transition),color var(--transition)}.copy-btn:hover{background:var(--bg-hover);color:var(--text-primary)}[data-theme=light] .download-icon{filter:invert(23%) sepia(91%) saturate(2467%) 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