:root{--canvas:#f4f6f4;--surface:#ffffff;--surface-soft:#eff2ef;--ink:#1c1b18;--text:#283129;--muted:#687268;--brand:#5a6f56;--brand-strong:#435440;--brand-soft:#eef4ed;--line:#d9ded9;--warm:#fbf2e4;--warm-ink:#8a5a12;--danger:#912018;--danger-soft:#fbefee;--info:#1d4ed8;--info-soft:#eef6ff;--radius:12px;--focus:0 0 0 3px rgba(90,111,86,0.25)}*{box-sizing:border-box}body,html{background:var(--canvas)}body{margin:0;color:var(--text);font-family:Arial,Helvetica,sans-serif;-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit}a,button{-webkit-tap-highlight-color:transparent}a{color:inherit}:focus-visible{outline:none;box-shadow:var(--focus)}.platform-shell{min-height:100vh;display:grid;grid-template-columns:260px minmax(0,1fr)}.platform-shell[data-rail-collapsed=true]{grid-template-columns:78px minmax(0,1fr)}.platform-rail{position:sticky;top:0;height:100vh;padding:20px 16px;display:flex;flex-direction:column;gap:18px;background:var(--surface);border-right:1px solid 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