:root{--bg:#111827;--bg2:#0f1623;--card:#1f2937;--line:#374151;--txt:#f3f4f6;--muted:#9ca3af;--accent:#34d399;--accent2:#10b981;--gold:#FFD700;--danger:#f87171}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--txt);line-height:1.75;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.wrap{max-width:760px;margin:0 auto;padding:0 20px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px}
header.top{position:sticky;top:0;z-index:20;background:rgba(17,24,39,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
header.top .bar{max-width:1040px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:14px}
.brand{display:flex;align-items:center;gap:10px}
.brand .logo{font-weight:800;letter-spacing:.5px;font-size:20px;color:var(--txt);text-shadow:0 0 10px rgba(52,211,153,.45)}
.brand .logo .em{color:var(--accent)}
.sonar-logo{position:relative;display:flex;align-items:center;justify-content:center;width:36px;height:36px;flex:0 0 auto}
.sonar-logo img{width:100%;height:100%;object-fit:contain;position:relative;z-index:2}
.sonar-ring{position:absolute;inset:0;border-radius:50%;border:1px solid rgba(255,215,0,.5);animation:sonar 5s ease-out infinite}
.sonar-ring.d2{animation-delay:2.5s}
@keyframes sonar{0%{transform:scale(.6);opacity:0}50%{opacity:.4}100%{transform:scale(2.5);opacity:0}}
header.top nav a{color:var(--muted);font-size:14px;font-weight:600;margin-left:16px}
header.top nav a:hover{color:var(--accent);text-decoration:none}
.breadcrumb{font-size:13px;color:var(--muted);margin:26px 0 10px}
.breadcrumb a{color:var(--muted)}
article{padding-bottom:40px}
.hero-img{width:100%;border-radius:16px;border:1px solid var(--line);margin:14px 0 8px;aspect-ratio:16/9;object-fit:cover}
h1{font-size:32px;line-height:1.2;margin:14px 0 10px;font-weight:800;letter-spacing:-.5px}
@media(min-width:720px){h1{font-size:40px}}
.meta{color:var(--muted);font-size:14px;margin-bottom:8px}
article h2{font-size:25px;font-weight:800;margin:34px 0 12px;letter-spacing:-.3px}
article h3{font-size:19px;font-weight:700;margin:24px 0 8px}
article p{margin:0 0 16px;font-size:17px}
article ol,article ul{margin:0 0 18px 0;padding-left:24px}
article li{margin:0 0 10px;font-size:17px}
article ol li::marker{color:var(--accent);font-weight:700}
article strong{color:#fff}
sup a{color:var(--accent);font-weight:700;text-decoration:none;font-size:.7em;padding:0 1px}
.callout{background:rgba(248,113,113,.10);border:1px solid rgba(248,113,113,.32);border-left:4px solid var(--danger);border-radius:10px;padding:16px 18px;margin:22px 0;color:#fecaca;font-size:15.5px}
.callout strong{color:#fff}
.refs{font-size:14px;color:var(--muted);padding-left:22px}
.refs li{margin-bottom:8px}
.refs a{word-break:break-word}
.faq{margin-top:34px}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin-bottom:12px}
.faq-item h3{margin:0 0 6px;font-size:17px}
.faq-item p{margin:0;color:var(--muted);font-size:15.5px}
.cta{background:linear-gradient(180deg,rgba(52,211,153,.10),var(--card));border:1px solid rgba(52,211,153,.4);border-radius:16px;padding:26px;text-align:center;margin:36px 0 10px}
.cta h3{font-size:20px;margin-bottom:8px}
.cta p{color:var(--muted);margin-bottom:16px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;border:none;border-radius:11px;padding:13px 22px;font-size:15px;cursor:pointer;background:linear-gradient(90deg,var(--accent),var(--accent2));color:#06231a}
.btn.wa{background:#25D366}
footer{border-top:1px solid var(--line);padding:30px 0;text-align:center;color:var(--muted);font-size:14px;margin-top:30px}
/* índice */
.blog-head{padding:46px 0 10px;text-align:center;background:radial-gradient(1000px 380px at 50% -10%,rgba(52,211,153,.12),transparent)}
.blog-head h1{font-size:34px}
.blog-head p{color:var(--muted);max-width:560px;margin:8px auto 0}
.cards{display:grid;grid-template-columns:1fr;gap:20px;padding:30px 0 50px}
@media(min-width:680px){.cards{grid-template-columns:1fr 1fr}}
.pcard{background:var(--card);border:1px solid var(--line);border-radius:16px;overflow:hidden;transition:border-color .25s,transform .25s}
.pcard:hover{border-color:rgba(52,211,153,.5);transform:translateY(-4px)}
.pcard a{color:inherit;text-decoration:none}
.pcard img{width:100%;aspect-ratio:16/9;object-fit:cover;border-bottom:1px solid var(--line)}
.pcard .b{padding:18px}
.pcard h2{font-size:19px;margin:0 0 8px;font-weight:700}
.pcard p{color:var(--muted);font-size:14.5px;margin:0}
@media(prefers-reduced-motion:reduce){.sonar-ring{animation:none}.pcard:hover{transform:none}}