:root{--bg: #f5f6f8;--surface: #ffffff;--border: #e3e6ea;--text: #1a1d21;--muted: #6b7280;--primary: #2040b0;--primary-dark: #16308a;--primary-soft: #e9ecfa;--danger: #c0392b;--danger-soft: #fdecea;--amber: #b7791f;--radius: 10px;--shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-size:15px;line-height:1.45}a{color:var(--primary)}h1,h2,h3{margin:0 0 .5rem;line-height:1.2}h1{font-size:1.5rem}h2{font-size:1.15rem}.app{display:flex;min-height:100vh}.sidebar{width:220px;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:1rem .75rem;position:sticky;top:0;height:100vh}.brand{font-weight:700;font-size:1.2rem;padding:.5rem .5rem 1rem;color:var(--primary)}.brand img{display:block;width:100%;max-width:160px;height:auto}.brand 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