:root{
--ink:#0D1B2A;--ink2:#2C3E50;--soft:#5A7184;
--bg:#F4F6F8;--bgw:#FFFFFF;--line:#DDE3EA;
--act:#1565C0;--acc:#00BCD4;--acc2:#00838F;
--warn:#FF6B35;--ok:#2E7D32;
--r:8px;--max:780px;--wide:1180px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:70px}
body{font-family:'Inter',system-ui,sans-serif;font-size:1rem;line-height:1.7;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,h4{font-family:'Syne',sans-serif;line-height:1.15;color:var(--ink)}
h1{font-size:clamp(1.9rem,5vw,3.2rem);font-weight:800}
h2{font-size:clamp(1.35rem,3vw,2rem);font-weight:700}
h3{font-size:1.1rem;font-weight:700}
p{max-width:70ch}
a{color:var(--act);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}

/* NAV */
#nav{position:sticky;top:0;z-index:200;background:rgba(13,27,42,.97);backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,.07)}
.nav-wrap{max-width:var(--wide);margin:0 auto;padding:0 1.25rem;height:60px;display:flex;align-items:center;justify-content:space-between;gap:1rem}
.logo{font-family:'Syne',sans-serif;font-size:1.35rem;font-weight:800;color:#fff;letter-spacing:-.03em;text-decoration:none;flex-shrink:0}
.logo em{color:var(--acc);font-style:normal}
.nav-links{display:flex;gap:1.5rem;list-style:none}
.nav-links a{color:rgba(255,255,255,.7);font-size:.85rem;font-weight:500;white-space:nowrap}
.nav-links a:hover{color:#fff;text-decoration:none}
.nav-cta{background:var(--acc);color:var(--ink)!important;padding:.38rem .9rem;border-radius:var(--r);font-weight:700;white-space:nowrap;font-size:.82rem}
.burger{display:none;background:none;border:none;cursor:pointer;padding:.5rem;flex-shrink:0}
.burger span{display:block;width:22px;height:2px;background:#fff;margin:5px 0;border-radius:2px;transition:transform .2s,opacity .2s}
body.nav-open .burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
body.nav-open .burger span:nth-child(2){opacity:0}
body.nav-open .burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* SECTIONS */
.sec{padding:4rem 1.25rem}
.sec-inner{max-width:var(--wide);margin:0 auto}
.sec-alt{background:var(--bgw)}
.label{display:inline-block;font-size:.7rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;padding:.22rem .6rem;border-radius:4px;margin-bottom:.85rem}
.label-acc{background:rgba(0,188,212,.12);color:var(--acc2)}
.label-warn{background:rgba(255,107,53,.1);color:var(--warn)}
.label-ok{background:rgba(46,125,50,.1);color:var(--ok)}
.sec-hd{margin-bottom:2.5rem}
.sec-hd h2{margin-bottom:.5rem}
.sec-hd p{color:var(--soft);font-size:.95rem}

/* HERO — FIX APAISADO */
.hero{background:var(--ink);color:#fff;padding:3.5rem 1.25rem 3rem;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 70% 60% at 80% 40%,rgba(0,188,212,.1),transparent 70%);pointer-events:none}
.hero-inner{max-width:var(--wide);margin:0 auto;display:grid;grid-template-columns:1fr 420px;gap:3.5rem;align-items:center}
.hero-eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-size:.78rem;font-weight:700;color:var(--acc);letter-spacing:.09em;text-transform:uppercase;margin-bottom:1.25rem}
.hero-eyebrow::before{content:'';width:22px;height:2px;background:var(--acc);flex-shrink:0}
.hero h1{color:#fff;margin-bottom:1.1rem;word-break:break-word}
.hero h1 span{color:var(--acc)}
.hero-sub{color:rgba(255,255,255,.62);font-size:1rem;margin-bottom:2rem;max-width:46ch;line-height:1.65}
.hero-btns{display:flex;gap:.85rem;flex-wrap:wrap;margin-bottom:2.5rem}
.btn-acc{display:inline-flex;align-items:center;gap:.4rem;background:var(--acc);color:var(--ink)!important;font-weight:700;font-size:.95rem;padding:.8rem 1.6rem;border-radius:var(--r);text-decoration:none!important;white-space:nowrap;transition:background .15s}
.btn-acc:hover{background:var(--acc2);text-decoration:none!important}
.btn-ghost{display:inline-flex;align-items:center;gap:.4rem;border:1.5px solid rgba(255,255,255,.3);color:rgba(255,255,255,.85)!important;font-weight:600;font-size:.95rem;padding:.8rem 1.6rem;border-radius:var(--r);text-decoration:none!important;white-space:nowrap;transition:border-color .15s}
.btn-ghost:hover{border-color:#fff;color:#fff!important;text-decoration:none!important}
.hero-stats{display:flex;gap:2rem;flex-wrap:wrap}
.hstat .num{font-family:'Syne',sans-serif;font-size:2rem;font-weight:800;color:var(--acc);line-height:1}
.hstat .lbl{font-size:.72rem;color:rgba(255,255,255,.42);margin-top:.15rem}

/* CALCULADORA HERO */
.calc-hero{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:1.75rem;backdrop-filter:blur(6px)}
.calc-hero h3{font-family:'Syne',sans-serif;font-size:.95rem;font-weight:700;color:#fff;margin-bottom:1.25rem;display:flex;align-items:center;gap:.5rem}
.calc-hero h3::before{content:'';width:8px;height:8px;border-radius:50%;background:var(--acc);display:inline-block;flex-shrink:0}
.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:.75rem}
.calc-field label{display:block;font-size:.72rem;font-weight:600;color:rgba(255,255,255,.5);margin-bottom:.3rem;text-transform:uppercase;letter-spacing:.05em}
.calc-field input,.calc-field select{width:100%;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);border-radius:6px;padding:.55rem .75rem;font-size:.9rem;font-family:'Inter',sans-serif;color:#fff;appearance:none;transition:border-color .15s}
.calc-field input:focus,.calc-field select:focus{outline:none;border-color:var(--acc)}
.calc-field select option{background:#1a3a5c;color:#fff}
.calc-submit{width:100%;margin-top:.85rem;background:var(--acc);color:var(--ink);border:none;border-radius:var(--r);padding:.75rem;font-size:.9rem;font-weight:700;font-family:'Inter',sans-serif;cursor:pointer;transition:background .15s}
.calc-submit:hover{background:var(--acc2)}
.calc-result{display:none;margin-top:1rem;background:rgba(0,188,212,.15);border-left:3px solid var(--acc);border-radius:0 6px 6px 0;padding:.85rem 1rem}
.calc-result.show{display:block}
.calc-result .res-num{font-family:'Syne',sans-serif;font-size:1.6rem;font-weight:800;color:#fff;line-height:1}
.calc-result .res-lbl{font-size:.75rem;color:rgba(255,255,255,.55);margin-top:.2rem}
.calc-result .res-rng{font-size:.8rem;color:rgba(0,188,212,.9);margin-top:.3rem}

/* DIAGNÓSTICO DESPLEGABLE */
.prob-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.25rem}
.prob-card{background:var(--bgw);border:1px solid var(--line);border-radius:12px;overflow:hidden;cursor:pointer;transition:box-shadow .2s,transform .2s}
.prob-card:hover{box-shadow:0 6px 28px rgba(0,0,0,.1);transform:translateY(-2px)}
.prob-head{display:flex;align-items:flex-start;gap:.9rem;padding:1.5rem}
.prob-head::after{content:'▸';font-size:1rem;color:var(--soft);margin-left:auto;flex-shrink:0;transition:transform .25s;padding-top:.15rem}
.prob-card.open .prob-head::after{transform:rotate(90deg)}
.prob-bar{height:4px;width:100%}
.prob-icon-wrap{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;flex-shrink:0}
.prob-title{font-family:'Syne',sans-serif;font-size:.95rem;font-weight:700;color:var(--ink);margin-bottom:.25rem}
.prob-meta{font-size:.78rem;color:var(--soft)}
.sev{display:inline-block;font-size:.68rem;font-weight:700;padding:.15rem .5rem;border-radius:99px;margin-top:.4rem}
.sev-hi{background:#FFEBEE;color:#C62828}
.sev-md{background:#FFF3E0;color:#E65100}
.sev-lo{background:#E8F5E9;color:#2E7D32}
/* Panel desplegable */
.prob-panel{display:none;border-top:1px solid var(--line);padding:1.5rem;background:#FAFBFC}
.prob-card.open .prob-panel{display:block}
.prob-panel h4{font-size:.85rem;font-weight:700;color:var(--ink);margin-bottom:.6rem}
.sol-list{list-style:none;display:flex;flex-direction:column;gap:.5rem;margin-bottom:1.1rem}
.sol-list li{display:flex;align-items:flex-start;gap:.5rem;font-size:.82rem;color:var(--ink2)}
.sol-list li::before{content:'→';color:var(--acc2);font-weight:700;flex-shrink:0;margin-top:.05rem}
.sol-cta{display:inline-flex;align-items:center;gap:.4rem;background:var(--act);color:#fff!important;font-weight:700;font-size:.8rem;padding:.55rem 1.1rem;border-radius:6px;text-decoration:none!important;transition:background .15s}
.sol-cta:hover{background:var(--act2);text-decoration:none!important}
.sol-cta-sec{display:inline-flex;align-items:center;gap:.4rem;border:1.5px solid var(--line);color:var(--soft)!important;font-weight:600;font-size:.8rem;padding:.5rem 1rem;border-radius:6px;text-decoration:none!important;margin-left:.5rem}
.sol-cta-sec:hover{border-color:var(--ink);color:var(--ink)!important;text-decoration:none!important}

/* PILARES */
.pilar-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem}
.pilar-card{background:var(--bgw);border:1px solid var(--line);border-radius:12px;overflow:hidden;display:flex;flex-direction:column;text-decoration:none;color:inherit;transition:box-shadow .2s}
.pilar-card:hover{box-shadow:0 4px 20px rgba(0,0,0,.08);text-decoration:none}
.pilar-body{padding:1.4rem;flex:1;display:flex;flex-direction:column;gap:.5rem}
.pilar-body h3{font-size:1rem;margin-bottom:.2rem}
.pilar-body p{font-size:.82rem;color:var(--soft);max-width:none;flex:1}
.pilar-link{font-size:.8rem;font-weight:700;color:var(--act);margin-top:.4rem}

/* ARTÍCULOS */
.art-list-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.1rem}
.art-card{background:var(--bgw);border:1px solid var(--line);border-radius:12px;padding:1.4rem;display:flex;gap:.9rem;align-items:flex-start;text-decoration:none;color:inherit;transition:box-shadow .15s,transform .15s}
.art-card:hover{box-shadow:0 4px 24px rgba(0,0,0,.08);transform:translateY(-1px);text-decoration:none}
.art-num{font-family:'Syne',sans-serif;font-size:1.8rem;font-weight:800;color:var(--line);line-height:1;min-width:2.25rem;flex-shrink:0}
.art-card h3{font-size:.87rem;margin-bottom:.25rem;color:var(--ink)}
.art-card p{font-size:.78rem;color:var(--soft);max-width:none}
.art-tag{display:inline-block;font-size:.67rem;font-weight:700;padding:.12rem .45rem;border-radius:4px;background:var(--bg);color:var(--soft);margin-top:.35rem}

/* FAQ */
details{border-bottom:1px solid var(--line)}
details summary{list-style:none;cursor:pointer;font-weight:600;font-size:.93rem;padding:1rem 0;display:flex;justify-content:space-between;align-items:center;gap:1rem}
details summary::-webkit-details-marker{display:none}
details summary::after{content:'+';font-size:1.25rem;color:var(--soft);flex-shrink:0}
details[open] summary::after{content:'×'}
.ans{font-size:.88rem;color:var(--ink2);padding-bottom:1rem;max-width:64ch}

/* CTA */
.cta-band{background:linear-gradient(135deg,#006064 0%,#00838F 100%);padding:4.5rem 1.25rem;text-align:center}
.cta-band h2{color:#fff;margin-bottom:.75rem}
.cta-band p{color:rgba(255,255,255,.75);max-width:50ch;margin:0 auto 2rem}
.btn-white{display:inline-block;background:#fff;color:var(--ink)!important;font-weight:800;padding:.85rem 1.9rem;border-radius:var(--r);font-size:1rem;text-decoration:none!important}
.btn-white:hover{background:#e0f7fa;text-decoration:none!important}

/* ARTÍCULO INDIVIDUAL */
.breadcrumb{max-width:var(--max);margin:0 auto;padding:1.25rem 1.25rem 0;font-size:.78rem;color:var(--soft);display:flex;gap:.4rem;flex-wrap:wrap;align-items:center}
.breadcrumb a{color:var(--soft)}.breadcrumb a:hover{color:var(--ink)}.breadcrumb span{color:var(--line)}
.art-content{max-width:var(--max);margin:0 auto;padding:2.5rem 1.25rem 5rem}
.art-content h1{margin-bottom:.65rem}
.art-meta{display:flex;gap:1rem;flex-wrap:wrap;align-items:center;margin-bottom:1.75rem;padding-bottom:1.4rem;border-bottom:1px solid var(--line);font-size:.78rem;color:var(--soft)}
.cat-badge{background:rgba(21,101,192,.1);color:var(--act);font-weight:700;padding:.2rem .6rem;border-radius:4px}
.art-content h2{font-size:1.4rem;margin:2.25rem 0 .85rem}
.art-content h3{font-size:1.1rem;margin:1.75rem 0 .65rem}
.art-content p{margin-bottom:.9rem;color:var(--ink2)}
.art-content ul,.art-content ol{margin:.85rem 0 1.35rem 1.5rem;color:var(--ink2)}
.art-content li{margin-bottom:.35rem;font-size:.93rem}
.art-content table{width:100%;border-collapse:collapse;margin:1.35rem 0;font-size:.855rem;overflow-x:auto;display:block}
.art-content th{background:var(--ink);color:#fff;padding:.6rem .9rem;text-align:left;font-weight:600;white-space:nowrap}
.art-content td{padding:.55rem .9rem;border-bottom:1px solid var(--line)}
.art-content tr:nth-child(even) td{background:var(--bg)}
.infobox{background:rgba(0,188,212,.06);border:1px solid rgba(0,188,212,.25);border-radius:var(--r);padding:1.1rem 1.35rem;margin:1.35rem 0}
.infobox strong{color:var(--acc2)}
.warnbox{background:rgba(255,107,53,.06);border:1px solid rgba(255,107,53,.25);border-radius:var(--r);padding:1.1rem 1.35rem;margin:1.35rem 0}
.okbox{background:rgba(46,125,50,.06);border:1px solid rgba(46,125,50,.2);border-radius:var(--r);padding:1.1rem 1.35rem;margin:1.35rem 0}
.checklist{list-style:none!important;margin-left:0!important}
.checklist li{display:flex;align-items:flex-start;gap:.4rem;margin-bottom:.4rem;font-size:.9rem}
.checklist li::before{content:'✓';color:var(--ok);font-weight:700;flex-shrink:0;margin-top:.1rem}
.aff-box{background:linear-gradient(135deg,var(--ink) 0%,#1a3a5c 100%);border-radius:12px;padding:1.75rem;margin:2.25rem 0;color:#fff}
.aff-box h3{color:#fff;margin-bottom:.65rem;font-size:1rem}
.aff-box p{color:rgba(255,255,255,.7);font-size:.855rem;max-width:none;margin-bottom:1.1rem}
.aff-btn{display:inline-block;background:var(--warn);color:#fff!important;font-weight:700;padding:.7rem 1.4rem;border-radius:var(--r);font-size:.875rem;text-decoration:none!important}
.aff-btn:hover{background:#e05a20;text-decoration:none!important}
.aff-note{font-size:.7rem;color:rgba(255,255,255,.4);margin-top:.65rem}
.faq-art details{border-bottom:1px solid var(--line)}
.faq-art summary{list-style:none;cursor:pointer;font-weight:600;padding:.85rem 0;display:flex;justify-content:space-between;align-items:center;font-size:.9rem}
.faq-art summary::-webkit-details-marker{display:none}
.faq-art summary::after{content:'+';font-size:1.1rem;color:var(--soft)}
.faq-art details[open] summary::after{content:'×'}
.faq-art .ans{font-size:.875rem;color:var(--ink2);padding-bottom:.9rem}

/* FOOTER */
footer{background:#07111A;color:#5A7184;padding:3.5rem 1.25rem 2rem}
.foot-grid{max-width:var(--wide);margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2.5rem;padding-bottom:2.5rem;border-bottom:1px solid rgba(255,255,255,.06)}
.foot-brand p{font-size:.8rem;line-height:1.7;margin-top:.65rem}.foot-social{display:flex;gap:.9rem;margin-top:.9rem}.foot-social a{color:rgba(255,255,255,.55);display:inline-flex;transition:color .15s}.foot-social a:hover{color:var(--acc)}
.foot-col .foot-h{color:#fff;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em;margin-bottom:.8rem}
.foot-col ul{list-style:none;display:flex;flex-direction:column;gap:.5rem}
.foot-col a{color:#5A7184;font-size:.78rem}
.foot-col a:hover{color:#fff;text-decoration:none}
.foot-bottom{max-width:var(--wide);margin:1.5rem auto 0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:.5rem;font-size:.76rem}
.foot-legal a{color:#5A7184;margin-left:1.25rem}
.foot-legal a:hover{color:#fff;text-decoration:none}

/* RESPONSIVE */
@media(max-width:1024px){
.hero-inner{grid-template-columns:1fr 360px;gap:2.5rem}
.pilar-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:860px){
.hero-inner{grid-template-columns:1fr;gap:2rem}
.calc-hero{display:none}
.foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
.nav-links{display:none}
.burger{display:block}
.hero{padding:2.5rem 1.25rem 2.25rem}
.hero-btns{flex-direction:column;gap:.6rem}
.btn-acc,.btn-ghost{justify-content:center}
.hero-stats{gap:1.5rem}
.prob-grid{grid-template-columns:1fr}
.pilar-grid{grid-template-columns:1fr}
.art-list-grid{grid-template-columns:1fr}
.foot-grid{grid-template-columns:1fr}
.calc-grid{grid-template-columns:1fr}
}
body.nav-open .nav-links{display:flex;flex-direction:column;position:fixed;top:60px;left:0;right:0;background:#0D1B2A;padding:1.25rem;gap:.85rem;border-bottom:1px solid rgba(255,255,255,.1);z-index:300}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* DIAGRAM BOX (SVG explicativo) */
.diagram-box{background:rgba(0,188,212,.04);border:1px solid var(--line);border-radius:var(--r);padding:1.25rem;margin:1.75rem 0}
.diagram-box svg{width:100%;height:auto;display:block}
.diagram-box figcaption{font-size:.78rem;color:var(--soft);text-align:center;margin-top:.75rem}

/* VERSION FOOTER */
.ver-tag{opacity:.4;margin-left:.5rem}

/* === Plantilla de artículo "v2" (filtración, cajón de persiana, silicona ducha, salitre y siguientes) === */
.nav-inner{max-width:var(--wide);margin:0 auto;padding:0 1.25rem;height:60px;display:flex;align-items:center;justify-content:space-between;gap:1rem}
.btn-sm{padding:.45rem 1rem!important;font-size:.82rem!important}
.art-inner{max-width:var(--max);margin:0 auto}
.art-inner ul,.art-inner ol{margin:.85rem 0 1.35rem 1.5rem;color:var(--ink2)}
.art-inner li{margin-bottom:.35rem;font-size:.93rem}
.art-inner p{margin-bottom:.9rem;color:var(--ink2)}
.art-inner h2{font-size:1.4rem;margin:2.25rem 0 .85rem}
.art-inner h3{font-size:1.1rem;margin:1.75rem 0 .65rem}
.direct-answer{background:rgba(0,188,212,.06);border:1px solid rgba(0,188,212,.25);border-radius:var(--r);padding:1.1rem 1.35rem;margin:1.1rem 0 1.5rem;max-width:none}
.toc{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:1.1rem 1.35rem;margin:1.25rem 0 1.75rem}
.toc-title{font-family:'Syne',sans-serif;font-weight:700;font-size:.85rem;color:var(--ink);margin-bottom:.5rem}
.toc ol{margin:0 0 0 1.2rem;font-size:.88rem}
.toc li{margin-bottom:.3rem}
.cta-box{background:rgba(21,101,192,.06);border:1px solid rgba(21,101,192,.2);border-radius:var(--r);padding:1.25rem 1.5rem;margin:2rem 0}
.cta-box p{margin-bottom:0;max-width:none}
.table-wrap{overflow-x:auto;margin:1.35rem 0;-webkit-overflow-scrolling:touch}
.art-table{width:100%;border-collapse:collapse;font-size:.855rem;min-width:480px}
.art-table th{background:var(--ink);color:#fff;padding:.6rem .9rem;text-align:left;font-weight:600;white-space:nowrap}
.art-table td{padding:.55rem .9rem;border-bottom:1px solid var(--line);vertical-align:top}
.art-table tr:nth-child(even) td{background:var(--bg)}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:.85rem;margin-top:1rem}
.related-card{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:.9rem 1.1rem;font-size:.85rem;font-weight:600;color:var(--ink);text-decoration:none!important;transition:box-shadow .15s,transform .15s}
.related-card:hover{box-shadow:0 4px 18px rgba(0,0,0,.08);transform:translateY(-1px);text-decoration:none!important}
.hfig{background:rgba(0,188,212,.04);border:1px solid var(--line);border-radius:var(--r);padding:1.25rem;margin:1.75rem 0}
.hfig svg{width:100%;height:auto;display:block}
.hfig figcaption{font-size:.78rem;color:var(--soft);text-align:center;margin-top:.75rem}
footer.foot{background:#07111A;color:#5A7184;padding:3.5rem 1.25rem 2rem}
.foot-cols{max-width:var(--wide);margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr;gap:2.5rem;padding-bottom:2rem;border-bottom:1px solid rgba(255,255,255,.06)}
.foot-cols h4{color:#fff;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em;margin-bottom:.8rem;font-family:'Syne',sans-serif}
.foot-cols>div>a:not(.logo){display:block;color:#5A7184;font-size:.78rem;margin-bottom:.5rem}
.foot-cols>div>a:not(.logo):hover{color:#fff;text-decoration:none}
.foot-cols .logo{display:inline-block;margin-bottom:.5rem}
.foot-bottom{max-width:var(--wide);margin:1.5rem auto 0;font-size:.76rem;color:#5A7184}
@media(max-width:860px){.foot-cols{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.foot-cols{grid-template-columns:1fr}}