/* El Commerce — estilos globais */
:root{
  --bg:#f7f8fb;
  --surface:#ffffff;
  --ink:#16202e;
  --ink-soft:#4a5668;
  --muted:#7a8597;
  --line:#dfe7ec;
  --brand:#206181;
  --brand-dark:#164a63;
  --accent:#2f87a3;
  --accent-soft:#e7f3f7;
  --ok:#1f8a4c;
  --bad:#c0392b;
  --radius:12px;
  --shadow:0 1px 2px rgba(16,32,46,.06),0 4px 16px rgba(16,32,46,.06);
  --max:1120px;
  --read:720px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;font-size:17px;line-height:1.65}
img{max-width:100%;height:auto}
a{color:var(--brand);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--brand-dark)}
h1,h2,h3{line-height:1.25;color:var(--ink);letter-spacing:-.01em}
h1{font-size:clamp(1.8rem,4vw,2.6rem);margin:.2em 0 .4em}
h2{font-size:1.5rem;margin:1.8em 0 .5em}
h3{font-size:1.18rem;margin:1.4em 0 .4em}
p{margin:0 0 1.05em}
.container{max-width:var(--max);margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px}
.skip:focus{left:16px;top:8px;background:#fff;padding:8px 12px;z-index:99}

/* Header */
.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.site-header .container{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;color:var(--ink);text-decoration:none}
.logo-mark{height:32px;width:auto;display:block}
.logo-text{font-family:"Jost","Futura","Century Gothic",sans-serif;font-weight:500;font-size:1.3rem;letter-spacing:.06em;color:#2a6d8a}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{color:var(--ink-soft);text-decoration:none;padding:8px 12px;border-radius:8px;font-weight:500;font-size:.95rem}
.nav a:hover,.nav a[aria-current="page"]{background:var(--bg);color:var(--brand)}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-size:1rem;cursor:pointer}
@media (max-width:760px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--surface);border-bottom:1px solid var(--line);flex-direction:column;padding:8px 16px 16px}
  .nav.open{display:flex}
}

/* Hero */
.hero{background:linear-gradient(135deg,#2a6d8a 0%,var(--brand-dark) 100%);color:#fff;padding:64px 0 56px}
.hero h1{color:#fff;max-width:760px}
.hero p{font-size:1.15rem;opacity:.92;max-width:640px}
.btn{display:inline-block;background:#3f93ab;color:#fff;text-decoration:none;font-weight:700;padding:12px 20px;border-radius:10px;border:0;cursor:pointer;font-size:1rem}
.btn:hover{filter:brightness(.95);color:#fff}
.btn-ghost{background:transparent;border:1.5px solid rgba(255,255,255,.6)}
.hero .actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}

/* Sections and cards */
.section{padding:48px 0}
.section-title{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin-bottom:18px}
.section-title h2{margin:0}
.grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);display:flex;flex-direction:column}
.card h3{margin:.3em 0 .4em;font-size:1.1rem}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a:hover{color:var(--brand)}
.card p{color:var(--ink-soft);font-size:.96rem;flex:1}
.card .more{font-weight:600;text-decoration:none;margin-top:6px}
.tag{display:inline-block;align-self:flex-start;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--accent);background:var(--accent-soft);padding:3px 8px;border-radius:6px}
.icon{font-size:1.6rem}
.meta{color:var(--muted);font-size:.88rem}

/* Article */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:40px;padding:36px 16px 56px}
@media (max-width:960px){.layout{grid-template-columns:1fr}}
.article{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(20px,4vw,44px);box-shadow:var(--shadow);min-width:0}
.article .content{max-width:var(--read)}
.article ul,.article ol{padding-left:1.3em;margin:0 0 1.1em}
.article li{margin-bottom:.4em}
.breadcrumb{font-size:.88rem;color:var(--muted);margin-bottom:8px}
.breadcrumb a{color:var(--muted)}
.callout{background:var(--accent-soft);border-left:4px solid var(--accent);padding:14px 18px;border-radius:8px;margin:1.4em 0}
.callout p:last-child{margin:0}
.formula{background:#f1f4f9;border:1px solid var(--line);border-radius:8px;padding:12px 16px;font-family:ui-monospace,Consolas,monospace;font-size:.95rem;overflow-x:auto;margin:1em 0}
table{width:100%;border-collapse:collapse;margin:1.2em 0;font-size:.95rem}
.table-wrap{overflow-x:auto}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left}
th{background:#f1f4f9}
.sidebar{display:flex;flex-direction:column;gap:20px}
.widget{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.widget h4{margin:0 0 10px;font-size:1rem}
.widget ul{list-style:none;padding:0;margin:0}
.widget li{padding:7px 0;border-bottom:1px solid var(--line);font-size:.94rem}
.widget li:last-child{border:0}
.widget a{text-decoration:none}
.sticky{position:sticky;top:84px}

/* Ad slots (placeholders até o AdSense ser aprovado) */
.ad-slot{margin:28px 0;min-height:0;text-align:center}
.ad-slot:empty{display:none}

/* Tools */
.tool{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin:20px 0}
.form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px}
.field label{display:block;font-weight:600;font-size:.9rem;margin-bottom:5px}
.field small{display:block;color:var(--muted);font-size:.8rem;margin-top:3px}
.field input,.field select{width:100%;padding:10px 12px;border:1px solid #cfd6e0;border-radius:8px;font-size:1rem;font-family:inherit;background:#fff}
.field input:focus,.field select:focus{outline:2px solid var(--brand);border-color:var(--brand)}
.result{margin-top:20px;display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px}
.stat{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:14px}
.stat .label{font-size:.82rem;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.03em}
.stat .value{font-size:1.45rem;font-weight:800;margin-top:2px}
.stat.good .value{color:var(--ok)}
.stat.bad .value{color:var(--bad)}
.notice{margin-top:14px;font-size:.92rem;color:var(--ink-soft)}

/* Footer */
.site-footer{background:#0e1622;color:#c4ccd8;padding:44px 0 24px;font-size:.93rem}
.site-footer a{color:#e6ebf2;text-decoration:none}
.site-footer a:hover{text-decoration:underline}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:28px}
@media (max-width:760px){.footer-grid{grid-template-columns:1fr}}
.site-footer h4{color:#fff;margin:0 0 10px;font-size:1rem}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{padding:4px 0}
.copy{border-top:1px solid #243145;margin-top:28px;padding-top:18px;font-size:.85rem;color:#8e9aac}

/* Cookie banner */
.cookie{position:fixed;left:16px;right:16px;bottom:16px;max-width:620px;margin:0 auto;background:var(--surface);border:1px solid var(--line);border-radius:12px;box-shadow:0 8px 32px rgba(0,0,0,.15);padding:16px 18px;display:none;z-index:50;font-size:.92rem}
.cookie.show{display:block}
.cookie .row{display:flex;gap:10px;margin-top:10px;flex-wrap:wrap}
.cookie button{padding:8px 14px;border-radius:8px;border:1px solid var(--line);background:#fff;cursor:pointer;font-weight:600;font-family:inherit}
.cookie button.primary{background:var(--brand);color:#fff;border-color:var(--brand)}

/* Autor */
.author-box{display:flex;gap:16px;align-items:flex-start;margin-top:36px;padding-top:24px;border-top:1px solid var(--line);max-width:var(--read)}
.author-box img{width:80px;height:80px;border-radius:50%;object-fit:cover;flex-shrink:0}
.author-box p{margin:4px 0 0;font-size:.94rem;color:var(--ink-soft)}
.author-hero{display:flex;gap:24px;align-items:center;margin:8px 0 24px;flex-wrap:wrap}
.author-hero img{width:160px;height:160px;border-radius:50%;object-fit:cover}