:root{--bg: #f6f7f9;--rail: #eef3f0;--surface: #ffffff;--surface-subtle: #f2f5f7;--border: #d8dee6;--border-strong: #c6ced8;--ink: #1f2328;--muted: #66717f;--brand: #184a3a;--brand-strong: #12362b;--accent: #295f9f;--success-bg: #e4f2eb;--highlight: #fff1b8;--code-bg: #20242a;--danger: #a6422b;color:var(--ink);background:var(--bg);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none;text-rendering:geometricPrecision}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button,input,textarea{font:inherit}a{color:inherit;text-decoration:none}.app-shell{display:grid;grid-template-columns:232px minmax(0,1fr);min-height:100vh}.rail{background:var(--rail);border-right:1px solid 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