:root{
  --bg:#ffffff; --bg-alt:#f5f5f7; --ink:#1d1d1f; --ink-2:#6e6e73; --ink-3:#86868b;
  --link:#0066cc; --btn:#0071e3; --btn-hover:#0077ed; --hairline:#d2d2d7;
  --nav-bg:rgba(255,255,255,.72); color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#000; --bg-alt:#101011; --ink:#f5f5f7; --ink-2:#a1a1a6; --ink-3:#86868b;
    --link:#2997ff; --btn:#0071e3; --btn-hover:#0077ed; --hairline:#3a3a3c;
    --nav-bg:rgba(20,20,22,.72); color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#000; --bg-alt:#101011; --ink:#f5f5f7; --ink-2:#a1a1a6; --ink-3:#86868b;
  --link:#2997ff; --btn:#0071e3; --btn-hover:#0077ed; --hairline:#3a3a3c;
  --nav-bg:rgba(20,20,22,.72); color-scheme:dark;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;overflow-x:hidden;scroll-padding-top:64px}
body{
  margin:0;background:var(--bg);color:var(--ink);overflow-x:hidden;
  font-family:"SF Pro Display","SF Pro Text","Helvetica Neue","Segoe UI",Helvetica,Arial,-apple-system,BlinkMacSystemFont,Roboto,sans-serif;
  font-size:17px;line-height:1.47;letter-spacing:-.022em;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent;
}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--btn);outline-offset:3px;border-radius:5px}
img{max-width:100%;height:auto}

/* ---------- promo + nav ---------- */
.promo{background:#1d1d1f;color:#f5f5f7}
.promo__in{max-width:1160px;margin:0 auto;padding:10px 20px;display:flex;flex-wrap:nowrap;gap:14px;align-items:center;justify-content:center;font-size:13px;line-height:1.3;letter-spacing:-.014em}
.promo__txt{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.promo__in strong{font-weight:600}
.promo__in a{flex:0 0 auto;background:#fff;color:#1d1d1f;font-weight:500;white-space:nowrap;padding:6px 14px;border-radius:980px;font-size:13px}
.promo__in a:hover{background:#e8e8ed;text-decoration:none}

.subnav{position:sticky;top:0;z-index:100;height:48px;background:var(--nav-bg);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid transparent;transition:border-color .2s}
.subnav.is-scrolled{border-bottom-color:var(--hairline)}
.subnav__in{max-width:1024px;margin:0 auto;height:100%;display:flex;align-items:center;gap:22px;padding:0 20px}
.brand{display:flex;align-items:center;gap:9px;color:var(--ink);font-size:19px;font-weight:600;letter-spacing:-.02em;flex:0 0 auto}
.brand:hover{text-decoration:none}
.brand svg{width:17px;height:auto;display:block}
.subnav__links{display:flex;align-items:center;gap:22px;margin-left:auto}
.subnav__links a{color:var(--ink);font-size:13px;letter-spacing:-.01em;white-space:nowrap}
.subnav__links a:hover{color:var(--ink-2);text-decoration:none}
.subnav__cta{background:var(--btn);color:#fff;padding:5px 13px;border-radius:980px;font-size:12px}
.subnav__cta:hover{background:var(--btn-hover);text-decoration:none}
@media (max-width:560px){ .subnav__links a.hide-sm{display:none} }

/* ---------- blog index ---------- */
.bloghead{max-width:720px;margin:0 auto;padding:clamp(46px,9vw,92px) 22px clamp(20px,4vw,36px);text-align:center}
.eyebrow{font-size:15px;font-weight:600;letter-spacing:-.014em;color:var(--btn);margin:0 0 10px}
.bloghead h1{font-size:clamp(32px,6vw,58px);font-weight:600;line-height:1.05;letter-spacing:-.02em;margin:0;text-wrap:balance}
.bloghead p{font-size:clamp(17px,2.4vw,21px);color:var(--ink-2);line-height:1.4;margin:16px auto 0;max-width:34rem;text-wrap:balance}

.postlist{max-width:760px;margin:0 auto;padding:8px 22px 90px;display:flex;flex-direction:column}
.post{padding:30px 0;border-top:1px solid var(--hairline)}
.post:first-child{border-top:0}
.post__meta{display:flex;flex-wrap:wrap;gap:6px 10px;font-size:13px;color:var(--ink-3);letter-spacing:-.01em;margin-bottom:10px;font-variant-numeric:tabular-nums}
.post__cat{color:var(--btn);font-weight:600}
.post h2{font-size:clamp(21px,3.1vw,28px);font-weight:600;line-height:1.18;letter-spacing:-.016em;margin:0 0 8px;text-wrap:balance}
.post h2 a{color:var(--ink)}
.post h2 a:hover{color:var(--link)}
.post p{margin:0;color:var(--ink-2);font-size:16px;line-height:1.5}
.post__more{display:inline-block;margin-top:12px;font-size:15px;letter-spacing:-.01em}

/* ---------- article ---------- */
.article{max-width:680px;margin:0 auto;padding:clamp(38px,8vw,76px) 22px 8px}
.article .eyebrow{text-align:left}
.article h1{font-size:clamp(29px,5.4vw,44px);font-weight:600;line-height:1.1;letter-spacing:-.02em;margin:0 0 18px;text-wrap:balance}
.article__meta{display:flex;flex-wrap:wrap;gap:6px 10px;font-size:14px;color:var(--ink-3);letter-spacing:-.01em;padding-bottom:26px;border-bottom:1px solid var(--hairline);font-variant-numeric:tabular-nums}
.prose{max-width:680px;margin:0 auto;padding:32px 22px 8px;font-size:19px;line-height:1.62;letter-spacing:-.011em;color:var(--ink)}
.prose > * + *{margin-top:1.25em}
.prose h2{font-size:clamp(22px,3.4vw,29px);font-weight:600;line-height:1.2;letter-spacing:-.016em;margin-top:1.9em}
.prose h3{font-size:19px;font-weight:600;letter-spacing:-.01em;margin-top:1.6em}
.prose ul,.prose ol{padding-left:1.25em}
.prose li{margin-top:.45em}
.prose strong{font-weight:600}
.prose a{text-decoration:underline;text-underline-offset:2px}
.prose blockquote{margin:1.7em 0;padding-left:20px;border-left:3px solid var(--btn);color:var(--ink-2);font-size:20px;line-height:1.5}
.prose blockquote p{margin:0}
.tablewrap{overflow-x:auto;margin:1.6em 0}
.prose table{width:100%;border-collapse:collapse;font-size:15px;font-variant-numeric:tabular-nums;min-width:440px}
.prose caption{caption-side:bottom;font-size:13px;color:var(--ink-3);text-align:left;padding-top:8px}
.prose th,.prose td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--hairline)}
.prose td.num,.prose th.num{text-align:right}
.prose th{font-weight:600;color:var(--ink-3);font-size:11px;text-transform:uppercase;letter-spacing:.05em}
.prose tbody tr:last-child td{border-bottom:0}

.cta-box{max-width:680px;margin:52px auto 0;padding:30px 26px;background:var(--bg-alt);border-radius:20px;text-align:center}
.cta-box h3{font-size:22px;font-weight:600;letter-spacing:-.016em;margin:0 0 8px;text-wrap:balance}
.cta-box p{margin:0 0 18px;color:var(--ink-2);font-size:16px;line-height:1.45}
.btn{display:inline-block;background:var(--btn);color:#fff;font-size:16px;letter-spacing:-.01em;padding:12px 24px;border-radius:980px}
.btn:hover{background:var(--btn-hover);text-decoration:none}
.backlink{max-width:680px;margin:36px auto 0;padding:0 22px;font-size:15px}

/* ---------- footer ---------- */
.foot{background:var(--bg);border-top:1px solid var(--hairline);margin-top:80px}
.foot__in{max-width:980px;margin:0 auto;padding:28px 22px 44px;display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between;align-items:center}
.foot__in a{color:var(--ink-2);font-size:13px}
.foot__in a:hover{color:var(--ink)}
.foot__in p{margin:0;font-size:12px;color:var(--ink-3);letter-spacing:-.01em}
.foot__links{display:flex;gap:18px;flex-wrap:wrap}

/* ---------- calculadora ---------- */
.calc{max-width:680px;margin:26px auto 0;padding:0 22px}
.calc__box{border:1px solid var(--hairline);border-radius:18px;padding:clamp(18px,3vw,26px);background:var(--bg-alt)}
.calc__field{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
.calc__field label{font-size:13px;color:var(--ink-2);letter-spacing:-.01em}
.calc__input{display:flex;align-items:center;gap:8px;border:1px solid var(--hairline);border-radius:12px;padding:8px 12px;background:var(--bg)}
.calc__input:focus-within{border-color:var(--btn);box-shadow:0 0 0 4px color-mix(in srgb,var(--btn) 15%,transparent)}
.calc__input input{flex:1;min-width:0;border:0;background:transparent;font:inherit;font-size:20px;font-weight:600;letter-spacing:-.02em;color:var(--ink);text-align:center;outline:none;font-variant-numeric:tabular-nums}
.calc__input .u{font-size:13px;color:var(--ink-3)}
.stepper{flex:0 0 auto;width:36px;height:36px;border-radius:9px;border:1px solid var(--hairline);background:var(--bg);color:var(--ink);font-size:18px;line-height:1;cursor:pointer;display:grid;place-items:center}
.stepper:active{background:var(--bg-alt)}
.calc__unit{text-align:center;font-size:clamp(19px,4vw,25px);font-weight:600;letter-spacing:-.02em;padding:12px 0 14px;border-bottom:1px solid var(--hairline);margin-bottom:12px;font-variant-numeric:tabular-nums}
.calc__unit span{display:block;font-size:12px;font-weight:400;color:var(--ink-3);letter-spacing:0;margin-top:4px}
.calc__lead{font-size:12px;color:var(--ink-3);margin:0 0 2px}
.calc__rows{display:flex;flex-direction:column}
.calc__r{display:grid;grid-template-columns:1fr auto;gap:4px 12px;align-items:start;padding:11px 0;border-top:1px solid var(--hairline)}
.calc__r:first-child{border-top:0}
.calc__r .nm .t{font-weight:500;color:var(--ink);font-size:14px;letter-spacing:-.01em}
.calc__r .nm .q{display:block;font-size:12px;color:var(--ink-3);margin-top:4px;font-variant-numeric:tabular-nums}
.calc__r .nm .q label{white-space:nowrap}
.calc__r .nm .q input{width:62px;border:1px solid var(--hairline);border-radius:7px;padding:3px 5px;font:inherit;font-size:12px;text-align:right;background:var(--bg);color:var(--ink);font-variant-numeric:tabular-nums;outline:none}
.calc__r .nm .q input:focus{border-color:var(--btn)}
.calc__r .sub{align-self:center;color:var(--ink);font-weight:600;font-size:14px;font-variant-numeric:tabular-nums;white-space:nowrap}
.calc__total{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-top:12px;padding-top:12px;border-top:1px solid var(--hairline)}
.calc__total span{font-size:14px;color:var(--ink-2)}
.calc__total b{font-size:clamp(19px,3.5vw,25px);font-weight:600;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.calc__disc{max-width:680px;margin:12px auto 0;padding:0 22px;font-size:12px;color:var(--ink-3);line-height:1.45}