:root{--bg:#eef1f6;--panel:#fff;--panel-brd:#d9e0ea;--text:#1f2733;--text-dim:#64748b;--beam:#334155;--shear:#0f9d8f;--moment:#e0821a;--load:#2563eb;--accent:#2563eb;--danger:#e11d48;--grid:#1e293b0d;--sans:"Inter", system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, "SF Mono", Consolas, monospace;--shadow:0 1px 2px #0f172a0a, 0 6px 20px #0f172a0f;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}html,body,#root{height:100%;min-height:100svh;margin:0}body{background:linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 26px 26px, linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 26px 26px, var(--bg)}#root{width:100%;margin:0 auto}.app{-webkit-user-select:none;user-select:none;flex-direction:column;gap:14px;min-height:100svh;padding:16px clamp(12px,3vw,28px) 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