:root{--bg:#f7f7f5;--card:#fff;--text:#14181f;--muted:#5b6473;--border:#d6d9de;--accent:#1a4480;--accent-hover:#15356a;--error:#b00020;--warn:#a06200;--user-bubble:#1a4480;--user-text:#fff;--bot-bubble:#eef0f3;--bot-text:#14181f}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:16px;line-height:1.55}.container{max-width:760px;margin:0 auto;padding:32px 20px 64px}h1{font-size:1.6rem;margin:0 0 12px}h2{font-size:1.2rem;margin:24px 0 8px}h3{font-size:1.05rem;margin:20px 0 6px}ol,p,ul{margin:0 0 12px}ol,ul{padding-left:22px}li{margin-bottom:4px}.card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:24px;margin-bottom:20px}.muted{color:var(--muted)}button{font-family:inherit;font-size:1rem;padding:10px 18px;border-radius:6px;border:1px solid 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