:root{--primary: #1e5eff;--primary-dark: #1546c0;--surface: #ffffff;--background: #f5f7fa;--border: #e2e8f0;--text: #1a2332;--text-muted: #64748b;--success: #16a34a;--warning: #f59e0b;--danger: #dc2626;--info: #0ea5e9;--radius: 12px;--shadow: 0 1px 3px rgba(26, 35, 50, .08), 0 1px 2px rgba(26, 35, 50, .04)}*{margin:0;padding:0;box-sizing:border-box}html,body{overflow-x:hidden}body{font-family:Inter,-apple-system,Segoe UI,Roboto,sans-serif;font-size:14px;color:var(--text);background:var(--background)}h1{font-size:28px;font-weight:600}h2{font-size:22px;font-weight:600}h3{font-size:18px;font-weight:600}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.app{display:flex;min-height:100vh}.sidebar{width:216px;flex-shrink:0;background:var(--surface);border-right:1px solid var(--border);padding:16px 12px;display:flex;flex-direction:column;gap:2px;position:sticky;top:0;height:100vh}.sidebar 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