/* Cálculos Fáciles — design system
   Base: calculator.net structure (tool first, categories, popular tools)
   with a modern, trustworthy skin. Trust blue + calm green accent. */
:root{
  --blue:#175C9E; --blue-dark:#0E2A47; --blue-deep:#123E6B;
  --green:#0E9F6E; --green-dark:#0B7A55;
  --ink:#1B2A3B; --muted:#56708A; --line:#DFE9F2;
  --bg:#F6F9FC; --card:#FFFFFF; --soft:#EDF4FA;
  --result-bg:#EAF7F1; --result-line:#BFE6D4;
  --radius:16px; --shadow:0 6px 24px rgba(14,42,71,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",system-ui,-apple-system,Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--ink);background:var(--bg);font-size:17px;line-height:1.55}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%}

/* ---------- header ---------- */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-in{max-width:1180px;margin:0 auto;padding:10px 18px;display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:11px;color:var(--blue-dark);font-weight:700;font-size:1.28rem;letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.brand img{width:42px;height:42px;display:block}
.brand .brand-accent{color:var(--green-dark)}
.main-nav{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
.main-nav a{color:var(--ink);padding:8px 12px;border-radius:10px;font-size:.98rem}
.main-nav a:hover{background:var(--soft);text-decoration:none;color:var(--blue-dark)}

/* ---------- layout ---------- */
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}
.layout main{max-width:900px;margin:0 auto}
.rail{display:none}
@media (min-width:1420px){
  body.ads-on .layout{display:grid;grid-template-columns:300px minmax(0,900px) 300px;gap:26px;justify-content:center;align-items:start}
  body.ads-on .layout main{margin:0}
  body.ads-on .rail{display:block;position:sticky;top:90px}
}
.ad-slot{display:none}
body.ads-on .ad-slot{display:flex;align-items:center;justify-content:center;background:#fff;border:1px dashed var(--line);
  border-radius:12px;color:var(--muted);font-size:.85rem;min-height:120px;margin:22px 0}
body.ads-on .rail .ad-slot{min-height:600px;margin:26px 0 0}
body.ads-on .ad-slot--bottom{min-height:110px}

/* ---------- hero / home ---------- */
.hero{background:linear-gradient(135deg,var(--blue-dark),var(--blue-deep) 55%,#14604F);color:#fff;border-radius:0 0 26px 26px}
.hero-in{max-width:1180px;margin:0 auto;padding:44px 18px 38px}
.hero h1{margin:0 0 10px;font-size:2.15rem;line-height:1.18;letter-spacing:-.015em}
.hero p{margin:0 0 22px;color:#CFE3F2;font-size:1.08rem;max-width:640px}
.search-box{display:flex;max-width:560px;background:#fff;border-radius:14px;padding:6px;box-shadow:var(--shadow)}
.search-box input{flex:1;border:0;outline:0;font-size:1.05rem;padding:10px 12px;color:var(--ink);min-width:0}
.search-box span{display:flex;align-items:center;padding:0 12px;color:var(--muted)}
.section{padding:30px 0 6px}
.section h2{font-size:1.45rem;margin:0 0 6px;color:var(--blue-dark);letter-spacing:-.01em}
.section .sub{color:var(--muted);margin:0 0 18px}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 18px;display:block;color:var(--ink);box-shadow:0 2px 10px rgba(14,42,71,.04);transition:transform .12s ease,box-shadow .12s ease}
.tool-card:hover{text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow);border-color:#C9DCEE}
.tool-card .icon{font-size:1.7rem;line-height:1;display:block;margin-bottom:10px}
.tool-card h3{margin:0 0 5px;font-size:1.08rem;color:var(--blue-dark)}
.tool-card p{margin:0;color:var(--muted);font-size:.94rem}
.tool-card.pop{border-color:var(--result-line);background:linear-gradient(180deg,#F4FBF7,#fff)}
.no-results{display:none;color:var(--muted);padding:14px 2px}

/* ---------- tool pages ---------- */
.crumb{font-size:.9rem;color:var(--muted);padding:18px 0 0}
.crumb a{color:var(--muted)}
.page-head h1{font-size:1.9rem;margin:8px 0 6px;color:var(--blue-dark);letter-spacing:-.015em;line-height:1.22}
.page-head p{color:var(--muted);margin:0 0 20px;max-width:700px}
.tool-box{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:24px}
.tool-box h2{margin:0 0 14px;font-size:1.15rem;color:var(--blue-dark)}
.field{margin-bottom:15px}
.field label{display:block;font-weight:600;margin-bottom:6px;font-size:.97rem}
.field .hint{font-weight:400;color:var(--muted);font-size:.87rem}
.field input,.field select{width:100%;padding:13px 14px;font-size:1.06rem;border:1.5px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);outline:none}
.field input:focus,.field select:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(23,92,158,.15)}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
.btn{display:inline-block;background:var(--green);color:#fff;border:0;border-radius:12px;padding:14px 26px;
  font-size:1.08rem;font-weight:700;cursor:pointer;width:100%;margin-top:4px}
.btn:hover{background:var(--green-dark)}
.btn-secondary{background:var(--soft);color:var(--blue-dark);width:auto;padding:10px 18px;font-size:.97rem}
.btn-secondary:hover{background:#DCEBF7}
.result{display:none;margin-top:20px;background:var(--result-bg);border:1.5px solid var(--result-line);border-radius:14px;padding:18px 20px}
.result.show{display:block}
.result .big{font-size:1.9rem;font-weight:800;color:var(--blue-dark);line-height:1.2}
.result .row{display:flex;justify-content:space-between;gap:14px;padding:6px 0;border-bottom:1px solid var(--result-line)}
.result .row:last-child{border-bottom:0}
.result .row b{color:var(--blue-dark);text-align:right}
.result p{margin:8px 0 0}
.error{display:none;margin-top:14px;background:#FDECEC;border:1.5px solid #F5C2C2;color:#8C2B2B;border-radius:12px;padding:12px 16px}
.error.show{display:block}
.dyn-row{display:grid;grid-template-columns:1fr 1fr auto;gap:10px;margin-bottom:10px;align-items:end}
.dyn-row .field{margin-bottom:0}
.dyn-remove{background:#FDECEC;color:#8C2B2B;border:0;border-radius:10px;padding:12px 14px;cursor:pointer;font-weight:700}
.tabs{display:flex;gap:8px;margin-bottom:18px;flex-wrap:wrap}
.tab{border:1.5px solid var(--line);background:#fff;color:var(--ink);border-radius:999px;padding:9px 18px;cursor:pointer;font-size:.98rem;font-weight:600}
.tab.active{background:var(--blue);border-color:var(--blue);color:#fff}

/* ---------- content ---------- */
.content{padding:8px 0 4px}
.content h2{font-size:1.4rem;color:var(--blue-dark);margin:26px 0 8px;letter-spacing:-.01em}
.content h3{font-size:1.1rem;color:var(--blue-dark);margin:20px 0 6px}
.content p{margin:0 0 12px}
.content ul{margin:0 0 12px;padding-left:22px}
.content li{margin-bottom:5px}
.formula{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:14px 18px;font-size:1.05rem;text-align:center;margin:12px 0 16px;color:var(--blue-dark);font-weight:600}
.example{background:#FFF9EC;border:1px solid #F0E2BC;border-radius:12px;padding:14px 18px;margin:12px 0 16px}
.example b{color:#7A5B12}
.note{background:#FFF4F4;border:1px solid #F3D3D3;border-radius:12px;padding:14px 18px;margin:16px 0;font-size:.96rem}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:13px 18px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:600;color:var(--blue-dark)}
.faq details p{margin:8px 0 2px;color:var(--ink)}
.related{padding:10px 0 34px}
.related h2{font-size:1.3rem;color:var(--blue-dark);margin:18px 0 14px}

/* ---------- footer ---------- */
.site-footer{background:var(--blue-dark);color:#C9DCEE;margin-top:26px}
.footer-in{max-width:1180px;margin:0 auto;padding:30px 18px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:26px}
.site-footer a{color:#EAF2FA}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:1.1rem}
.footer-brand img{width:34px;height:34px}
.site-footer h4{color:#fff;margin:0 0 10px;font-size:1rem}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin-bottom:7px;font-size:.95rem}
.footer-note{border-top:1px solid rgba(255,255,255,.16);padding:14px 18px;text-align:center;font-size:.87rem;color:#9FB9D2;max-width:1180px;margin:0 auto}

/* ---------- simple pages ---------- */
.simple-page{max-width:820px;margin:0 auto;padding-bottom:20px}
.simple-page h1{font-size:1.8rem;color:var(--blue-dark);margin:20px 0 10px}
.simple-page h2{font-size:1.25rem;color:var(--blue-dark);margin:22px 0 6px}

/* ---------- mobile ---------- */
@media (max-width:720px){
  body{font-size:16px}
  .hero h1{font-size:1.62rem}
  .hero-in{padding:32px 16px 28px}
  .page-head h1{font-size:1.52rem}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .dyn-row{grid-template-columns:1fr 1fr auto}
  .tool-box{padding:18px 16px}
  .result .big{font-size:1.55rem}
  .footer-in{grid-template-columns:1fr}
  .main-nav{margin-left:0}
  .header-in{gap:10px}
}