/* ===== Variables ===== */
:root{
  --bg:#f6f8fb; --surface:#fff; --text:#1f2937; --muted:#64748b;
  --primary:#1d4ed8; --primary-dark:#1e40af; --accent:#0ea5e9;
  --border:#e2e8f0; --ok:#15803d; --warn:#b45309; --bad:#b91c1c;
  --radius:12px; --shadow:0 1px 3px rgba(15,23,42,.08),0 4px 14px rgba(15,23,42,.05);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.65;font-size:17px}
img,svg,canvas{max-width:100%}
a{color:var(--primary)}
a:hover{color:var(--primary-dark)}
h1,h2,h3{line-height:1.25;color:#0f172a}
h1{font-size:clamp(1.7rem,4vw,2.3rem);margin:.2em 0 .4em}
h2{font-size:1.45rem;margin:1.6em 0 .5em}
h3{font-size:1.15rem;margin:1.2em 0 .4em}
.container{width:100%;max-width:1120px;margin:0 auto;padding:0 16px}

/* ===== Header ===== */
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:62px;gap:12px}
.logo{font-weight:800;font-size:1.3rem;text-decoration:none;color:#0f172a;letter-spacing:-.02em}
.logo span{color:var(--primary)}
.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;padding:8px 12px;font-size:1rem;cursor:pointer}
.main-nav ul{list-style:none;display:flex;gap:4px;margin:0;padding:0;flex-wrap:wrap}
.main-nav a{display:block;padding:8px 12px;border-radius:8px;text-decoration:none;color:var(--text);font-size:.95rem}
.main-nav a:hover,.main-nav a[aria-current="page"]{background:#eff6ff;color:var(--primary)}
@media(max-width:860px){
  .nav-toggle{display:block}
  .main-nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--surface);border-bottom:1px solid var(--border);padding:8px 16px 14px}
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column}
}

/* ===== Layout ===== */
.page{display:grid;gap:28px;padding:24px 0 48px}
@media(min-width:960px){.page.has-sidebar{grid-template-columns:minmax(0,1fr) 300px}}
.breadcrumb{font-size:.88rem;color:var(--muted);margin-bottom:6px}
.breadcrumb a{color:var(--muted)}
.lead{color:var(--muted);font-size:1.08rem;margin:0 0 1.2em}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.sidebar .card{margin-bottom:20px;padding:18px}
.sidebar h2{font-size:1.05rem;margin:0 0 .6em}
.sidebar ul{list-style:none;margin:0;padding:0}
.sidebar li a{display:block;padding:7px 0;border-bottom:1px solid var(--border);text-decoration:none}
.sidebar li:last-child a{border-bottom:0}
@media(min-width:960px){.sidebar-sticky{position:sticky;top:80px}}

/* ===== Calculadoras ===== */
.calc h2{margin-top:0;font-size:1.25rem}
.form-grid{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:620px){.form-grid{grid-template-columns:1fr 1fr}}
.field{display:flex;flex-direction:column;gap:5px}
.field.full{grid-column:1/-1}
label,.label{font-weight:600;font-size:.93rem}
input[type=number],input[type=text],select{width:100%;padding:11px 12px;font-size:1rem;border:1px solid #cbd5e1;border-radius:8px;background:#fff;color:var(--text)}
input:focus,select:focus,button:focus-visible,summary:focus-visible{outline:3px solid #bfdbfe;border-color:var(--primary)}
.hint{font-size:.82rem;color:var(--muted)}
.radio-row{display:flex;gap:8px;flex-wrap:wrap}
.radio-row label{font-weight:500;display:flex;align-items:center;gap:6px;border:1px solid #cbd5e1;border-radius:8px;padding:9px 14px;cursor:pointer}
.radio-row input:checked + span{font-weight:700;color:var(--primary)}
.btn{display:inline-block;background:var(--primary);color:#fff;border:0;border-radius:8px;padding:12px 22px;font-size:1rem;font-weight:600;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--primary-dark);color:#fff}
.btn.secondary{background:#e2e8f0;color:#0f172a}
.btn.secondary:hover{background:#cbd5e1;color:#0f172a}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}
.results{margin-top:20px;display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}
.result{background:#f1f5f9;border-radius:10px;padding:14px}
.result .k{font-size:.82rem;color:var(--muted)}
.result .v{font-size:1.35rem;font-weight:800;color:#0f172a;word-break:break-word}
.result.main{background:#eff6ff;border:1px solid #bfdbfe}
.result.main .v{color:var(--primary)}
.msg{margin-top:14px;padding:12px 14px;border-radius:8px;background:#f1f5f9;font-size:.95rem}
.msg.error{background:#fef2f2;color:var(--bad)}
.disclaimer{font-size:.85rem;color:var(--muted);margin-top:14px}
.table-wrap{overflow-x:auto;margin-top:16px}
table{border-collapse:collapse;width:100%;font-size:.92rem}
th,td{padding:8px 10px;border-bottom:1px solid var(--border);text-align:right;white-space:nowrap}
th:first-child,td:first-child{text-align:left}
thead th{background:#f1f5f9;position:sticky;top:0}
.chart-box{position:relative;height:320px;margin-top:20px}
details{margin-top:16px}
summary{cursor:pointer;font-weight:600;color:var(--primary)}

/* ===== Contenido ===== */
.content{margin-top:28px}
.content p,.content li{max-width:72ch}
.content ul,.content ol{padding-left:1.3em}
.faq details{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:12px 16px;margin:10px 0}
.faq summary{color:#0f172a}
.faq details p{margin:.6em 0 0}

/* ===== Home ===== */
.hero{padding:40px 0 10px;text-align:center}
.hero p{max-width:640px;margin:0 auto;color:var(--muted);font-size:1.1rem}
.tool-grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));margin-top:26px}
.tool-card{display:flex;flex-direction:column;gap:6px;text-decoration:none;color:var(--text);transition:transform .15s,box-shadow .15s}
.tool-card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(15,23,42,.12);color:var(--text)}
.tool-card .icon{font-size:1.8rem}
.tool-card h3{margin:.1em 0}
.tool-card p{margin:0;color:var(--muted);font-size:.95rem}

/* ===== Anuncios (AdSense) =====
   Los contenedores .ad-slot están vacíos y ocultos hasta que pegues el código
   del bloque de anuncios: al contener algo, se muestran automáticamente. */
.ad-slot{margin:24px auto;text-align:center;min-height:100px;overflow:hidden}
.ad-slot:empty{display:none}

/* ===== Footer ===== */
.site-footer{background:#0f172a;color:#cbd5e1;padding:36px 0 24px;font-size:.93rem}
.site-footer a{color:#e2e8f0}
.footer-grid{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.site-footer h2{color:#fff;font-size:1rem;margin:0 0 .6em}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{padding:3px 0}
.copy{border-top:1px solid #334155;margin-top:24px;padding-top:16px;color:#94a3b8;font-size:.85rem}

/* ===== Banner cookies ===== */
.cookie-banner{position:fixed;left:0;right:0;bottom:0;z-index:100;background:#0f172a;color:#e2e8f0;padding:16px;box-shadow:0 -4px 20px rgba(0,0,0,.25)}
.cookie-inner{max-width:1120px;margin:0 auto;display:flex;gap:16px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.cookie-inner p{margin:0;flex:1 1 380px;font-size:.92rem}
.cookie-inner a{color:#93c5fd}
.cookie-actions{display:flex;gap:10px}
.cookie-actions .btn{padding:9px 18px}

.legal h2{font-size:1.25rem}
.legal li{margin:.25em 0}