*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0d1117;--surface: #161b22;--surface2: #21262d;--border: #30363d;--text: #c9d1d9;--text-dim: #8b949e;--accent: #58a6ff;--green: #3fb950;--yellow: #d29922;--red: #f85149;--orange: #ffa502;--font-mono: "SF Mono", "Fira Code", "Consolas", monospace}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:14px;line-height:1.5;min-height:100vh}.app{display:flex;flex-direction:column;min-height:100vh}.nav{display:flex;align-items:center;gap:4px;padding:0 16px;height:48px;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.nav-brand{font-weight:700;font-size:16px;color:var(--accent);margin-right:16px;text-decoration:none}.nav-btn{padding:6px 12px;border:none;background:transparent;color:var(--text-dim);cursor:pointer;border-radius:6px;font-size:13px;transition:background .15s,color 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