:root{--bg:#f5f8fb;--ink:#172033;--muted:#627087;--line:#dbe4ee;--brand:#0b5f75;--brand2:#153b66;--soft:#eaf5f7;--ok:#19724c;--err:#a03939;--white:#fff;--shadow:0 10px 30px rgba(24,46,72,.08)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}.container{max-width:1180px;margin:auto;padding:0 24px}.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.topbar-inner{height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-weight:800;color:var(--brand2);text-decoration:none;font-size:20px}.tag{margin-left:8px;font-size:12px;background:var(--soft);color:var(--brand);padding:4px 8px;border-radius:999px}.topbar nav{display:flex;gap:16px;flex-wrap:wrap}.topbar nav 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/* CAT-LLM-Edu v1.1 — fluxo necessidade → evidência → estratégia */
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