:root{--bg: #f4f6fb;--card: #ffffff;--border: #e2e8f0;--text: #1e293b;--muted: #64748b;--primary: #2563eb;--danger: #dc2626;--ok: #16a34a;--warn: #d97706}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}.muted{color:var(--muted);font-size:.9em}.centro{display:grid;place-items:center;height:100vh}.topbar{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.topbar-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;gap:24px;padding:12px 20px}.marca{font-weight:700;font-size:1.1rem}.nav{display:flex;gap:8px;flex:1}.nav-link{padding:6px 12px;border-radius:8px;color:var(--muted)}.nav-link.activo,.nav-link:hover{background:#eef2ff;color:var(--primary)}.usuario-box{display:flex;align-items:center;gap:12px}.usuario-nombre{font-size:.9rem}.contenido{max-width:1100px;margin:0 auto;padding:24px 20px 60px}.btn{border:1px 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