:root{--bg: #f8fafc;--surface: #ffffff;--border: #dbe3ee;--text: #0f172a;--muted: #64748b;--accent: #2563eb;--navy: #0f172a;--success: #16a34a;--warning: #f59e0b;--danger: #dc2626}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text)}a{color:var(--accent);text-decoration:none}button,input,select,textarea{font:inherit}pre{white-space:pre-wrap}.app-shell{display:grid;grid-template-columns:280px 1fr;min-height:100vh}.sidebar{background:var(--navy);color:#fff;padding:28px 22px;display:flex;flex-direction:column;justify-content:space-between;gap:24px}.brand-mark{font-size:14px;letter-spacing:.24em;font-weight:700}.brand-subtitle{margin-top:10px;color:#cbd5e1;font-size:14px}.nav-stack{display:grid;gap:8px}.nav-link{color:#cbd5e1;padding:10px 12px;border:1px solid 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