:root{--bg:#f5f5f5;--surface:#fff;--border:#e0e0e0;--text:#1a1a1a;--text-muted:#888;--primary:#3b82f6;--primary-hover:#2563eb;--primary-bg:#eff6ff;--danger:#ef4444;--danger-hover:#dc2626;--radius:8px;--shadow-sm:0 1px 3px #00000014;--shadow-md:0 4px 12px #0000001a;--sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;--mono:"SF Mono", SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace}*{box-sizing:border-box;margin:0;padding:0}html,body{-webkit-text-size-adjust:100%;height:100%;overflow:hidden}body{font-family:var(--sans);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:14px}.app{flex-direction:column;width:100%;height:100dvh;display:flex}.app-header{background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;height:56px;padding:0 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