:root{--bg:#F3F6F1;--surface:#fff;--fg:#10231B;--muted:#52625A;--line:#D6DFD8;--accent:#0F7A4F;--ink:#fff;--gold:#B7800A;--shadow:0 18px 40px -26px rgba(16,35,27,.35);--nav:rgba(243,246,241,.92);
--d:Georgia,'Times New Roman',serif;--b:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;--hh:64px}
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0C1612;--surface:#14221B;--fg:#EAF2ED;--muted:#9CB0A5;--line:#25382F;--accent:#4FD39A;--ink:#07140E;--gold:#E8B84A;--shadow:0 18px 40px -26px #000;--nav:rgba(12,22,18,.92);color-scheme:dark}}
:root[data-theme="dark"]{--bg:#0C1612;--surface:#14221B;--fg:#EAF2ED;--muted:#9CB0A5;--line:#25382F;--accent:#4FD39A;--ink:#07140E;--gold:#E8B84A;--shadow:0 18px 40px -26px #000;--nav:rgba(12,22,18,.92);color-scheme:dark}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--hh) + 12px)}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.65 var(--b);-webkit-text-size-adjust:100%}
h1,h2,h3{font-family:var(--d);font-weight:700;line-height:1.15;margin:0;text-wrap:balance}
h1{font-size:clamp(2rem,5.5vw,3.4rem);letter-spacing:-.015em}
h2{font-size:clamp(1.5rem,3.4vw,2.1rem)}h3{font-size:1.25rem}
p{margin:0 0 1rem}a{color:var(--accent)}
img,svg{max-width:100%}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;z-index:99;background:var(--accent);color:var(--ink);padding:.5rem 1rem;border-radius:8px}
.wrap{max-width:1120px;margin-inline:auto;padding-inline:16px}
.narrow{max-width:760px;margin-inline:auto;padding-inline:16px}
header.top{position:sticky;top:0;z-index:50;height:var(--hh);background:var(--nav);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
header.top .wrap{height:100%;display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand{font:700 1.35rem var(--d);text-decoration:none;color:var(--fg);white-space:nowrap}.brand i{color:var(--accent);font-style:normal}
nav.main{display:flex;gap:1.4rem;align-items:center}
nav.main a{font-size:.95rem;font-weight:500;color:var(--muted);text-decoration:none;padding:.3rem 0;border-bottom:2px solid transparent}
nav.main a:hover,nav.main a[aria-current]{color:var(--fg);border-color:var(--accent)}
.tools{display:flex;gap:.5rem;align-items:center}
.ib{width:40px;height:40px;border-radius:50%;border:1.5px solid var(--line);background:none;color:var(--fg);font-size:1.05rem;cursor:pointer;display:inline-grid;place-items:center}
.ib:hover{border-color:var(--accent)}
#menu{display:none}
@media(max-width:820px){#menu{display:inline-grid}
nav.main{position:absolute;left:0;right:0;top:var(--hh);background:var(--bg);border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;padding:.6rem 16px 1rem;gap:.2rem;display:none}
nav.main.open{display:flex}nav.main a{padding:.6rem 0;width:100%;font-size:1.05rem}}
.crumbs{font-size:.85rem;color:var(--muted);padding:1.2rem 0 0}.crumbs a{color:var(--muted)}
.hero{padding:clamp(2.5rem,7vw,5rem) 0 clamp(2rem,5vw,3.5rem);background-image:radial-gradient(var(--line) 1px,transparent 1px);background-size:28px 28px;border-bottom:1px solid var(--line)}
.hero h1 em{color:var(--accent);font-style:italic}
.hero .lead{font-size:1.15rem;color:var(--muted);max-width:60ch;margin:1.1rem 0 0}
.eye{display:inline-flex;align-items:center;gap:.7rem;font-size:.76rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:.9rem}.eye::before{content:"";width:2rem;height:1.5px;background:currentColor}
.btns{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.6rem}
.btn{font:700 .95rem var(--b);border:0;border-radius:99px;padding:.8rem 1.5rem;background:var(--accent);color:var(--ink);cursor:pointer;text-decoration:none;display:inline-block}
.btn:hover{filter:brightness(1.08)}.btn.o{background:none;color:var(--fg);border:1.5px solid var(--line)}.btn.o:hover{border-color:var(--accent)}
section.blk{padding:clamp(2.2rem,5vw,3.6rem) 0}section.blk.alt{background:var(--surface);border-block:1px solid var(--line)}
.sh{display:flex;justify-content:space-between;align-items:end;gap:1rem;flex-wrap:wrap;margin-bottom:1.5rem}.sh p{color:var(--muted);margin:.5rem 0 0;max-width:56ch}
.grid{display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:1.3rem;box-shadow:var(--shadow)}
.alt .card{background:var(--bg)}
a.card{display:block;text-decoration:none;color:inherit;transition:transform .2s,border-color .2s}a.card:hover{transform:translateY(-3px);border-color:var(--accent)}
.card h3{margin:.3rem 0 .5rem}.card p{color:var(--muted);font-size:.93rem;margin:0}
.tag{font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
.meta{font-size:.82rem;color:var(--muted);margin-top:.8rem!important}
.chips{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:2rem}
.chip{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:1rem 1.2rem}.chip b{display:block;font:700 1.8rem var(--d);color:var(--accent)}.chip span{font-size:.88rem;color:var(--muted)}
/* articulos */
.art{padding:1.2rem 0 3rem}.art h1{margin:.4rem 0 1rem}
.byline{font-size:.88rem;color:var(--muted);margin-bottom:1.6rem;padding-bottom:1.2rem;border-bottom:1px solid var(--line)}
.narrow>h2{margin-bottom:.9rem}
.prose h2{margin:2.4rem 0 .8rem}.prose h3{margin:1.8rem 0 .6rem}
.prose ul,.prose ol{padding-left:1.3rem;margin:0 0 1.1rem}.prose li{margin-bottom:.45rem}
.prose .lead{font-size:1.15rem;color:var(--muted)}
.prose table{width:100%;border-collapse:collapse;margin:1.2rem 0;font-size:.95rem}
.prose th,.prose td{text-align:left;padding:.6rem .7rem;border-bottom:1px solid var(--line)}.prose th{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.tablewrap{overflow-x:auto}
.callout{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:12px;padding:1rem 1.2rem;margin:1.4rem 0}
.callout.warn{border-left-color:var(--gold)}.callout p:last-child{margin:0}
.cta{background:var(--surface);border:1px solid var(--accent);border-radius:18px;padding:1.3rem 1.4rem;margin:2rem 0;display:flex;gap:1rem;align-items:center;justify-content:space-between;flex-wrap:wrap}
.cta p{margin:0}.cta b{display:block;font:700 1.15rem var(--d)}
.disc{font-size:.85rem;color:var(--muted);border-top:1px solid var(--line);margin-top:2.4rem;padding-top:1rem}
details{border-top:1px solid var(--line);padding:1rem 0}details:last-of-type{border-bottom:1px solid var(--line)}
summary{font:700 1.1rem var(--d);cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:1rem}summary::-webkit-details-marker{display:none}summary::after{content:"+";color:var(--accent);font-size:1.5rem;line-height:1}details[open] summary::after{content:"–"}
details p{color:var(--muted);margin:.7rem 0 0}
/* calculadoras */
.calc{display:grid;grid-template-columns:minmax(260px,400px) 1fr;gap:1.4rem;align-items:start;margin:1.6rem 0 1rem}@media(max-width:860px){.calc{grid-template-columns:1fr}}
label,.lb{display:block;font-size:.88rem;font-weight:700;margin:1.1rem 0 .35rem}label:first-child,.lb:first-child{margin-top:0}
.hint{font-size:.8rem;color:var(--muted);font-weight:400}
input[type=number],select{width:100%;font:inherit;padding:.7rem 1rem;border-radius:12px;border:1.5px solid var(--line);background:var(--bg);color:var(--fg)}
input[type=range]{width:100%;accent-color:var(--accent)}
.row{display:flex;justify-content:space-between;align-items:baseline;gap:.6rem}.row output{font-weight:700;color:var(--accent)}
.seg{display:flex;gap:.4rem;flex-wrap:wrap}.seg button{flex:1;font:inherit;font-weight:700;padding:.55rem;border-radius:10px;border:1.5px solid var(--line);background:none;color:var(--fg);cursor:pointer}.seg button[aria-pressed=true]{background:var(--accent);color:var(--ink);border-color:var(--accent)}
.chk{display:flex;gap:.6rem;align-items:center;font-weight:500;margin-top:1.1rem}
.cap{font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.big{font:700 clamp(2.2rem,6vw,3.4rem)/1 var(--d);color:var(--accent);margin:.3rem 0 1rem}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.8rem}.st{border:1px solid var(--line);border-radius:14px;padding:.8rem 1rem}.st b{display:block;font:700 1.3rem var(--d)}.st span{font-size:.8rem;color:var(--muted)}
.bar{height:12px;border-radius:99px;background:var(--line);overflow:hidden;margin:1.2rem 0 .4rem}.bar i{display:block;height:100%;background:var(--accent);width:0;transition:width .5s}
.split{display:flex;height:14px;border-radius:99px;overflow:hidden;margin:1.2rem 0 .6rem}.split i{display:block}
.msg{margin-top:1rem;font-size:.95rem;color:var(--muted);min-height:2.6em}.msg strong{color:var(--fg)}
svg.ch{width:100%;height:auto;display:block;margin-top:1rem}.ch text{fill:var(--muted);font:11px var(--b)}
.note{font-size:.8rem;color:var(--muted);margin-top:1rem}
/* publicidad */
.ad-slot{display:none;margin:2rem auto;text-align:center;min-height:100px;max-width:100%;overflow:hidden}.ad-slot.on{display:block}
.ad-slot::before{content:"Publicidad";display:block;font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:.3rem}
/* footer y cookies */
footer.bot{margin-top:3rem;border-top:1px solid var(--line);background:var(--surface);padding:2.2rem 0 5rem;font-size:.9rem;color:var(--muted)}
footer.bot .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1.6rem}
footer.bot h4{margin:0 0 .6rem;color:var(--fg);font:700 .95rem var(--b)}footer.bot ul{list-style:none;margin:0;padding:0}footer.bot li{margin:.35rem 0}footer.bot a{color:var(--muted)}footer.bot a:hover{color:var(--accent)}
footer.bot .legal{margin-top:1.6rem;padding-top:1.1rem;border-top:1px solid var(--line);font-size:.8rem}
.linkbtn{background:none;border:0;padding:0;font:inherit;color:var(--muted);text-decoration:underline;cursor:pointer}.linkbtn:hover{color:var(--accent)}
#cookies{position:fixed;left:12px;right:12px;bottom:12px;z-index:90;max-width:760px;margin-inline:auto;background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:0 20px 50px -20px rgba(0,0,0,.45);padding:1.1rem 1.3rem;display:none}
#cookies.show{display:block}#cookies p{font-size:.9rem;margin:0 0 .9rem;color:var(--muted)}#cookies .btns{margin:0}#cookies .btn{padding:.65rem 1.2rem;font-size:.9rem}
@media print{header.top,footer.bot,#cookies,.ad-slot,.cta,.btns{display:none!important}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}