:root{
  --c-bg:#f3f6fa;--c-surface:#ffffff;--c-ink:#0f1b2d;--c-ink-soft:#3a4b61;
  --c-muted:#647387;--c-line:#e4ebf3;--c-line-2:#cdd8e6;
  --c-brand:#0b7a67;--c-brand-d:#093f37;--c-brand-700:#0a6557;--c-brand-50:#e7f5f1;
  --c-brand-100:#cdeae3;--c-accent:#1763d6;--c-accent-50:#eaf2ff;
  --c-warn:#9a6a00;--c-warn-bg:#fff7e6;--c-warn-line:#f0d9a3;
  --r-sm:8px;--r-md:12px;--r-lg:16px;--r-xl:22px;
  --sh-1:0 1px 2px rgba(15,27,45,.05);--sh-2:0 6px 20px rgba(15,27,45,.08);
  --sh-3:0 14px 40px rgba(11,122,103,.16);
  --ff-head:'Poppins',system-ui,sans-serif;--ff-body:'Inter',system-ui,sans-serif;
  --ct:.2s cubic-bezier(.4,0,.2,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--ff-body);margin:0;color:var(--c-ink);background:var(--c-bg);
  line-height:1.65;-webkit-font-smoothing:antialiased;font-size:16px}
h1,h2,h3,h4,.brand{font-family:var(--ff-head);letter-spacing:-.01em;color:var(--c-brand-d);line-height:1.22}
a{color:var(--c-brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
strong{color:var(--c-ink)}

/* ---- legacy per-page brand header hidden; top bar replaces it ---- */
header{display:none!important}

/* ---- Top bar (brand) ---- */
.site-top{background:var(--c-surface);border-bottom:1px solid var(--c-line);
  position:sticky;top:0;z-index:30}
.site-top .row{max-width:1180px;margin:0 auto;padding:12px 22px;display:flex;
  align-items:center;gap:18px}
.site-top a.brand{display:inline-flex;align-items:center;gap:9px;font-weight:800;
  font-size:1.16rem;color:var(--c-brand-d)}
.site-top a.brand:hover{text-decoration:none}
.brandmark{width:30px;height:30px;border-radius:8px;
  background:linear-gradient(135deg,var(--c-brand),#16a085);
  display:inline-flex;align-items:center;justify-content:center;color:#fff;flex:0 0 auto}
.brandmark svg{width:18px;height:18px}

/* ---- Primary nav (categories) ---- */
.mnav{background:var(--c-brand-d);padding:0 14px;display:flex;gap:0;
  position:sticky;top:55px;z-index:29;border:0;overflow-x:auto;
  -webkit-overflow-scrolling:touch;max-width:none}
.mnav::-webkit-scrollbar{height:0}
.mnav>a{color:#cfe6e0;font-family:var(--ff-head);font-weight:600;font-size:.92rem;
  padding:13px 16px;white-space:nowrap;border-bottom:3px solid transparent;transition:var(--ct)}
.mnav>a:hover{color:#fff;background:rgba(255,255,255,.07);text-decoration:none}

/* ---- Page shell ---- */
.shell{max-width:1180px;margin:0 auto;padding:0 22px 52px}
.bc{font-size:.84rem;color:var(--c-muted);margin:0;padding:16px 0 4px;display:flex;
  flex-wrap:wrap;gap:6px;align-items:center}
.bc a{color:var(--c-muted)}
.bc a:hover{color:var(--c-brand)}
.bc .sep{opacity:.5}

/* ---- Layout grid: main + sidebar ---- */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:32px;
  align-items:start;margin-top:14px}
.main{min-width:0}
.sidebar{position:sticky;top:118px;display:flex;flex-direction:column;gap:18px}

/* ---- Hero (compact, professional) ---- */
.hero{display:flex;align-items:flex-start;gap:18px;margin:8px 0 18px}
.hero .ic{width:56px;height:56px;flex:0 0 auto;border-radius:15px;
  background:var(--c-brand-50);color:var(--c-brand);display:flex;align-items:center;
  justify-content:center}
.hero .ic svg{width:30px;height:30px}
.hero h1{font-size:1.95rem;margin:0}
.hero p{margin:8px 0 0;color:var(--c-ink-soft);font-size:1.04rem;max-width:64ch}
.hero-home h1{font-size:2.25rem}

/* ---- Cards ---- */
.card{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-lg);
  padding:24px;margin:0 0 22px;box-shadow:var(--sh-1)}

/* ---- Calculator / result panel ---- */
.tool{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-lg);
  box-shadow:var(--sh-2);position:relative;overflow:hidden;margin:0 0 24px}
.tool::before{content:"";position:absolute;left:0;right:0;top:0;height:4px;
  background:linear-gradient(90deg,var(--c-brand),#16a085)}
.tool-in{padding:24px 26px 22px}
.tool-h{font-family:var(--ff-head);font-weight:700;font-size:1.05rem;
  color:var(--c-brand-d);margin:0 0 14px;display:flex;align-items:center;gap:9px}
.tool-h .d{width:30px;height:30px;border-radius:8px;background:var(--c-brand-50);
  color:var(--c-brand);display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto}
.tool-h .d svg{width:17px;height:17px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* ---- Form fields (large, calculator.net feel) ---- */
label{display:block;font-weight:600;margin:13px 0 6px;font-size:.9rem;color:var(--c-ink-soft)}
input,select,textarea{width:100%;padding:12px 13px;border:1.5px solid var(--c-line-2);
  border-radius:var(--r-sm);font-size:1.02rem;font-family:var(--ff-body);background:#fff;
  color:var(--c-ink);transition:var(--ct)}
input:hover,select:hover,textarea:hover{border-color:#9fb0c6}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--c-brand);
  box-shadow:0 0 0 3px rgba(11,122,103,.16)}
button,.btn{display:inline-block;margin-top:18px;background:var(--c-brand);color:#fff;border:0;
  padding:13px 22px;border-radius:var(--r-sm);font-size:1.03rem;font-weight:700;
  font-family:var(--ff-head);cursor:pointer;transition:var(--ct);text-decoration:none;
  box-shadow:0 2px 8px rgba(11,122,103,.26)}
button:hover,.btn:hover{background:var(--c-brand-700);box-shadow:0 6px 18px rgba(11,122,103,.32);
  text-decoration:none;color:#fff}
button:active,.btn:active{transform:translateY(1px)}
button:focus-visible,.btn:focus-visible,a:focus-visible{outline:3px solid rgba(11,122,103,.45);
  outline-offset:2px}
.btn.w{background:#fff;color:var(--c-brand);box-shadow:var(--sh-1)}
.btn.w:hover{background:var(--c-brand-50);color:var(--c-brand-d)}

/* ---- RESULT (destacado) ---- */
.res{margin-top:20px;padding:20px 22px;
  background:linear-gradient(135deg,var(--c-brand-50),#f1faf7);
  border:1.5px solid var(--c-brand-100);border-radius:var(--r-md);
  font-size:1rem;color:var(--c-ink-soft);animation:rin .3s ease}
.res b{font-family:var(--ff-head);font-size:1.55rem;line-height:1.15;color:var(--c-brand-d);
  letter-spacing:-.01em}
@keyframes rin{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---- Reading content ---- */
.prose h2{font-size:1.42rem;margin:1.7em 0 .5em;scroll-margin-top:120px}
.prose h3{font-size:1.14rem;margin:1.3em 0 .35em;color:var(--c-brand-d);scroll-margin-top:120px}
.prose p{margin:.7em 0;color:#27384e}
.prose ul,.prose ol{margin:.6em 0 1.1em 1.2em;padding:0}
.prose li{margin:.45em 0;color:#27384e}
.prose article{background:none;border:0;padding:0;margin:0}

/* steps (numbered) */
.steps{counter-reset:s;list-style:none;padding:0;margin:18px 0}
.steps li{position:relative;padding:14px 16px 14px 58px;background:var(--c-brand-50);
  border:1px solid var(--c-brand-100);border-radius:var(--r-md);margin:12px 0;color:#27384e}
.steps li:before{counter-increment:s;content:counter(s);position:absolute;left:14px;top:14px;
  width:30px;height:30px;border-radius:50%;background:var(--c-brand);color:#fff;
  font-family:var(--ff-head);font-weight:700;display:flex;align-items:center;justify-content:center}
.steps li b{font-family:var(--ff-head);display:block;margin-bottom:3px;color:var(--c-brand-d)}

/* callouts */
.note{background:var(--c-warn-bg);border-left:4px solid var(--c-warn-line);
  border-radius:0 var(--r-sm) var(--r-sm) 0;padding:14px 18px;margin:16px 0;font-size:.94rem;
  color:#5b4a22}
.note strong,.note b{color:#5b4a22}
.cta{background:var(--c-brand-50);border:1px solid var(--c-brand-100);border-radius:var(--r-md);
  padding:22px;text-align:center;margin:22px 0}
.cta p{margin:0 0 6px}
.eg{background:var(--c-accent-50);border-left:4px solid var(--c-accent);
  border-radius:0 var(--r-sm) var(--r-sm) 0;padding:14px 18px;margin:14px 0}

/* monospace formula boxes that pages set inline -> normalize */
.prose p[style*="monospace"]{background:#fff!important;border:1px solid var(--c-line)!important;
  border-radius:var(--r-sm)!important;color:var(--c-brand-d)}

/* ---- Tables ---- */
.tablewrap{overflow-x:auto;margin:16px 0;border:1px solid var(--c-line);border-radius:var(--r-md)}
table{width:100%;border-collapse:collapse;font-size:.93rem;margin:0}
th,td{padding:11px 13px;border-bottom:1px solid var(--c-line);text-align:left;vertical-align:top}
thead th,tr:first-child th{background:#f5faf8;font-family:var(--ff-head);color:var(--c-brand-d);
  font-size:.86rem;letter-spacing:.01em}
tbody tr:hover{background:#f8fcfb}
table tr:last-child td{border-bottom:0}

/* ---- FAQ ---- */
.faq{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-lg);
  padding:6px 22px;box-shadow:var(--sh-1);margin:14px 0}
.faq details{padding:0;border-bottom:1px solid var(--c-line);background:none;border-radius:0}
.faq details:last-child{border-bottom:0}
details{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-md);
  padding:2px 18px;margin:10px 0}
summary{font-family:var(--ff-head);font-weight:600;cursor:pointer;padding:14px 30px 14px 0;
  position:relative;list-style:none;color:var(--c-brand-d);transition:var(--ct)}
summary::-webkit-details-marker{display:none}
summary::after{content:"";position:absolute;right:2px;top:18px;width:9px;height:9px;
  border-right:2px solid var(--c-brand);border-bottom:2px solid var(--c-brand);
  transform:rotate(45deg);transition:transform var(--ct)}
details[open] summary::after{transform:rotate(-135deg)}
summary:hover{color:var(--c-brand)}
details>*:not(summary){margin:0 0 14px;color:#27384e}

/* ---- TOC (sticky sidebar index) ---- */
.toc{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-lg);
  padding:18px 18px 14px;box-shadow:var(--sh-1)}
.toc h3{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--c-muted);
  margin:0 0 10px}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:t}
.toc li{margin:0}
.toc a{display:block;padding:7px 8px 7px 10px;border-left:2px solid var(--c-line);
  color:var(--c-ink-soft);font-size:.9rem;transition:var(--ct);line-height:1.35}
.toc a:hover{border-left-color:var(--c-brand);color:var(--c-brand-d);background:var(--c-brand-50);
  text-decoration:none}
.toc a.sub{padding-left:22px;font-size:.86rem;color:var(--c-muted)}
.toc a.active{border-left-color:var(--c-brand);color:var(--c-brand-d);font-weight:600}

/* ---- Datos clave (facts box) ---- */
.facts{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-lg);
  padding:18px;box-shadow:var(--sh-1)}
.facts h3{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--c-muted);
  margin:0 0 12px;display:flex;align-items:center;gap:8px}
.facts h3 svg{width:16px;height:16px;color:var(--c-brand)}
.facts dl{margin:0;display:flex;flex-direction:column;gap:2px}
.facts .frow{display:flex;justify-content:space-between;gap:12px;padding:8px 0;
  border-bottom:1px solid var(--c-line);font-size:.92rem}
.facts .frow:last-child{border-bottom:0}
.facts dt{color:var(--c-muted)}
.facts dd{margin:0;font-weight:600;color:var(--c-ink);text-align:right}

/* ---- Sidebar widgets ---- */
.swid{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-lg);
  padding:18px;box-shadow:var(--sh-1)}
.swid h3{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--c-muted);
  margin:0 0 12px}
.slist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.slist a{display:flex;align-items:center;gap:10px;padding:9px 8px;border-radius:9px;
  color:var(--c-ink);font-weight:500;font-size:.93rem;transition:var(--ct)}
.slist a:hover{background:var(--c-brand-50);color:var(--c-brand-d);text-decoration:none}
.slist a .d{width:30px;height:30px;flex:0 0 auto;border-radius:8px;background:var(--c-brand-50);
  color:var(--c-brand);display:flex;align-items:center;justify-content:center}
.slist a .d svg{width:16px;height:16px}

/* ---- Tiles / grid (home + related) ---- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;margin:14px 0}
.tile{display:flex;align-items:flex-start;gap:12px;background:var(--c-surface);
  border:1px solid var(--c-line);border-radius:var(--r-md);padding:16px 17px;
  color:var(--c-ink);transition:var(--ct);box-shadow:var(--sh-1)}
.tile:hover{transform:translateY(-3px);box-shadow:var(--sh-3);border-color:var(--c-brand-100);
  text-decoration:none}
.tile .ic{flex:0 0 auto;width:40px;height:40px;border-radius:11px;background:var(--c-brand-50);
  color:var(--c-brand);display:flex;align-items:center;justify-content:center}
.tile .ic svg{width:21px;height:21px}
.tile .tx{min-width:0}
.tile .tx b{display:block;font-family:var(--ff-head);font-size:.97rem;color:var(--c-brand-d);
  margin-bottom:2px}
.tile .tx span{font-size:.86rem;color:var(--c-muted);line-height:1.4}

/* category heading on home */
.cat-head{display:flex;align-items:center;gap:11px;margin:30px 0 4px}
.cat-head .ic{width:36px;height:36px;border-radius:10px;background:var(--c-brand-50);
  color:var(--c-brand);display:flex;align-items:center;justify-content:center}
.cat-head .ic svg{width:20px;height:20px}
.cat-head h2{margin:0;font-size:1.3rem}

/* home search */
.csearch{position:relative;max-width:560px;margin:18px 0 4px}
.csearch input{padding-left:46px;height:54px;font-size:1.05rem;border-radius:999px;box-shadow:var(--sh-2)}
.csearch svg{position:absolute;left:17px;top:50%;transform:translateY(-50%);width:20px;height:20px;color:var(--c-muted)}

/* ---- Ads ---- */
.ad{margin:20px 0;text-align:center;min-height:90px;overflow:hidden}
.ad-side{margin:0;min-height:250px}
.adsbygoogle{display:block}

/* ---- Footer ---- */
footer{display:block}
.site-foot{background:var(--c-brand-d);color:#a9cfc7;margin-top:44px;padding:34px 22px;text-align:center}
.site-foot .fnav{margin:0 0 8px}
.site-foot a{color:#cfe7e0}
.site-foot a:hover{color:#fff}
.site-foot p{margin:6px 0;font-size:.88rem}

/* video */
.vid,.video{position:relative;padding-bottom:56.25%;height:0;border-radius:var(--r-md);
  overflow:hidden;margin:16px 0}
.vid iframe,.video iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0}

/* responsive */
@media(max-width:980px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:static}
  .toc{display:none}
  .row{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
  body{font-size:15.5px}
  .shell{padding:0 15px 40px}
  .hero{gap:13px}
  .hero h1{font-size:1.55rem}.hero-home h1{font-size:1.8rem}
  .hero .ic{width:46px;height:46px}.hero .ic svg{width:26px;height:26px}
  .card,.tool-in,.faq{padding:18px}
  .res b{font-size:1.3rem}
  .row{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr}
}
@media print{.site-top,.mnav,.site-foot,.ad,.noprint,.sidebar{display:none!important}}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .tile:hover{transform:none}
}