:root{--bg:#f5f6f8;--panel:#fff;--line:#e3e6eb;--ink:#1f2933;--muted:#6b7480;--acc:#c8102e;--acc2:#9e0b22;--ok:#15803d;--warn:#b45309;--bad:#b91c1c;--sel:#2563eb}*{box-sizing:border-box}html,body{margin:0;height:100%;font:13px/1.45 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg)}#app{height:100%;display:flex;flex-direction:column}header{display:flex;align-items:center;gap:18px;padding:8px 14px;background:#fff;border-bottom:3px solid var(--acc)}.brand{font-size:15px;font-weight:600;white-space:nowrap}.brand small{color:var(--muted);font-weight:400;font-size:11px;margin-left:4px}.logo{background:var(--acc);color:#fff;padding:2px 7px;border-radius:4px;letter-spacing:.08em;margin-right:4px}.stepper{display:flex;gap:6px;list-style:none;margin:0 auto;padding:0}.stepper li{display:flex;gap:6px;align-items:center;padding:4px 12px;border-radius:16px;background:#f1f3f6;cursor:pointer;font-weight:500}.stepper li b,aside h2 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