:root{--bg: #0f1117;--panel: #171a23;--border: #262b38;--fg: #e6e8ee;--muted: #8b93a7;--accent: #7c3aed;--link: #6aa9ff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:14px/1.5 -apple-system,system-ui,Segoe UI,Roboto,sans-serif}a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.muted{color:var(--muted)}.small{font-size:12px}.center{display:grid;place-items:center;min-height:100vh}.error{color:#ff6b6b}.app{display:flex;flex-direction:column;height:100vh}.topbar{display:flex;align-items:center;gap:24px;padding:12px 20px;background:var(--panel);border-bottom:1px solid var(--border);flex:none}.brand{font-weight:700}.topbar nav{display:flex;gap:16px}.topbar nav a{color:var(--muted)}.topbar nav a:hover{color:var(--fg);text-decoration:none}.topbar nav a.active{color:var(--fg);font-weight:600}.topbar 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