:root{
  --ink:#1E2530; --inksoft:#5A6473; --paper:#F4F1EA; --paper2:#EAE5DB; --card:#FFFFFF;
  --blue:#1F4E79; --blueD:#163A5C; --steel:#3E6B95; --tan:#C58A4E; --tanD:#9A6531;
  --amber:#E8852B; --amberD:#C86E18; --green:#2E7D4F; --char:#141A22; --panel:#E7EEF4;
  --line:#DED8CC; --shadow:0 14px 40px -22px rgba(20,26,34,.45);
  --maxw:1140px; --rad:16px; --disp:"Archivo",system-ui,sans-serif; --body:"IBM Plex Sans",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--body);color:var(--ink);background:var(--paper);line-height:1.68;font-size:18px;-webkit-font-smoothing:antialiased}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
h1,h2,h3,h4{font-family:var(--disp);line-height:1.14;color:var(--blueD);font-weight:800;letter-spacing:-.01em}
h1{font-size:clamp(2rem,4.8vw,3.3rem);margin:.2em 0 .35em}
h2{font-size:clamp(1.5rem,3vw,2.1rem);margin:1.7em 0 .55em}
h3{font-size:1.25rem;margin:1.5em 0 .4em;font-weight:700}
h4{font-size:1.06rem;margin:0 0 .3em;font-weight:700}
a{color:var(--blue);text-decoration:underline;text-underline-offset:2px;text-decoration-thickness:1.5px}
a:hover{color:var(--amberD)}
p{margin:0 0 1.05em}
img,svg{max-width:100%}
.skip{position:absolute;left:-9999px;top:0;background:var(--char);color:#fff;padding:10px 16px;z-index:200;border-radius:0 0 8px 0}
.skip:focus{left:0}

/* header */
.site-head{position:sticky;top:0;z-index:100;background:rgba(244,241,234,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.head-row{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:66px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--blueD);font-family:var(--disp);font-weight:800}
.brand-name{font-size:1.22rem;letter-spacing:-.02em}
.brand-name b{color:var(--amber);font-weight:800}
.logo-mark{flex:none;border-radius:10px;box-shadow:0 4px 12px -5px rgba(31,78,121,.7)}
.site-nav ul{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.site-nav a{font-family:var(--disp);font-weight:600;font-size:.94rem;color:var(--ink);text-decoration:none;padding:9px 12px;border-radius:8px}
.site-nav a:hover{background:var(--panel);color:var(--blue)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:10px}
.nav-toggle span{width:24px;height:2.4px;background:var(--char);border-radius:2px;transition:.25s}

/* blueprint hero */
.hero{position:relative;overflow:hidden;background:var(--blueD);color:#EaF1F8}
.hero:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);background-size:30px 30px;opacity:.5}
.hero .wrap{position:relative;padding-top:62px;padding-bottom:56px;display:grid;grid-template-columns:1.05fr .95fr;gap:46px;align-items:center}
.kicker{font-family:var(--disp);text-transform:uppercase;letter-spacing:.16em;font-size:.76rem;font-weight:700;color:var(--amber);margin-bottom:12px}
.hero h1{color:#fff}
.hero p.lede{font-size:1.16rem;color:#C7D6E6;max-width:36ch;margin-bottom:26px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;font-family:var(--disp);font-weight:700;font-size:1rem;background:var(--amber);color:#241008;border:0;padding:14px 26px;border-radius:11px;cursor:pointer;text-decoration:none;box-shadow:0 12px 26px -12px rgba(232,133,43,.8);transition:transform .15s,background .15s}
.btn:hover{background:var(--amberD);color:#fff;transform:translateY(-2px)}
.btn.ghost{background:transparent;color:#fff;box-shadow:none;border:2px solid rgba(255,255,255,.5);padding:12px 24px}
.btn.ghost:hover{background:rgba(255,255,255,.1);color:#fff;border-color:#fff}
.btn.sm{padding:9px 18px;font-size:.9rem}
.hero-art{filter:drop-shadow(0 24px 40px rgba(0,0,0,.4))}
.hero-art .ill{border-radius:var(--rad)}

/* sections */
section{padding:8px 0}
.section-pad{padding:54px 0}
.band{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.center{text-align:center}
.center .tool-sub,.center p{margin-left:auto;margin-right:auto;max-width:64ch}

/* safety banner */
.safebar{background:#FBEFD9;border-top:2px solid var(--amber);border-bottom:2px solid var(--amber)}
.safebar .wrap{display:flex;gap:14px;align-items:flex-start;padding:16px 22px}
.safebar .si{font-size:1.4rem;flex:none}
.safebar p{margin:0;font-size:.95rem;color:#5a3d12}
.safebar b{color:var(--amberD)}

/* feature cards */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:34px}
.feat{background:var(--card);border:1px solid var(--line);border-radius:var(--rad);padding:24px 22px;box-shadow:var(--shadow)}
.feat .fi{width:46px;height:46px;border-radius:11px;display:flex;align-items:center;justify-content:center;background:var(--panel);margin-bottom:14px;font-size:1.4rem}
.feat h3{margin:.1em 0 .35em}
.feat p{font-size:.97rem;color:var(--inksoft);margin:0}

/* tool */
.tool-section{padding:54px 0}
.tool{background:var(--char);color:#DCE6F0;border-radius:22px;padding:38px;box-shadow:0 30px 70px -34px rgba(20,26,34,.85);position:relative;overflow:hidden}
.tool:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:28px 28px;opacity:.6;pointer-events:none}
.tool-head{position:relative;max-width:64ch}
.tool-head .kicker{color:var(--amber)}
.tool h2{color:#fff;margin:.1em 0 .35em}
.tool-sub{color:#B6C6D8}
.form2{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:15px;align-items:end;margin-top:26px}
.form2 .btn{grid-column:1 / -1;justify-self:start}
.field label{display:block;font-family:var(--disp);font-weight:600;font-size:.74rem;text-transform:uppercase;letter-spacing:.06em;color:var(--amber);margin-bottom:7px}
.field input,.select-wrap select{width:100%;font-family:var(--body);font-size:1rem;padding:12px 13px;border-radius:10px;border:1.5px solid #2c3947;background:#1d2731;color:#fff}
.field input:focus,.select-wrap select:focus{outline:2px solid var(--amber);border-color:var(--amber)}
.select-wrap{position:relative}
.select-wrap select{appearance:none;-webkit-appearance:none;cursor:pointer}
.select-wrap:after{content:"\25BE";position:absolute;right:13px;top:50%;transform:translateY(-40%);color:var(--amber);pointer-events:none}
.results{position:relative;max-height:0;overflow:hidden;opacity:0;transition:max-height .55s ease,opacity .5s ease,margin-top .4s;margin-top:0}
.results.show{max-height:4000px;opacity:1;margin-top:30px}
.spec-head,.tl-title{font-family:var(--disp);font-weight:700;text-transform:uppercase;letter-spacing:.1em;font-size:.78rem;color:var(--amber);margin:0 0 12px}
.spec{background:rgba(255,255,255,.05);border:1px solid #2c3947;border-radius:14px;padding:20px}
.spec-grid{display:grid;grid-template-columns:auto 1fr;gap:8px 22px}
.sp-k{color:#9fb2c6;font-size:.94rem}
.sp-v{font-family:var(--disp);font-weight:700;color:#fff;font-size:.97rem}
.next{display:flex;gap:16px;align-items:flex-start;background:linear-gradient(100deg,rgba(232,133,43,.16),rgba(31,78,121,.18));border:1px solid #2c3947;border-radius:14px;padding:16px 20px;margin-top:20px}
.nx-ic{font-size:1.6rem;flex:none}
.nx-k{font-family:var(--disp);font-weight:700;text-transform:uppercase;letter-spacing:.08em;font-size:.72rem;color:var(--amber)}
.nx-t{color:#E4EDF6;font-size:1rem}
.check{margin:0;padding:0;list-style:none;display:grid;gap:9px}
.check li{position:relative;padding-left:30px;color:#CAD8E6;font-size:.95rem}
.check li:before{content:"";position:absolute;left:0;top:3px;width:18px;height:18px;border:2px solid var(--green);border-radius:5px}
.check li:after{content:"";position:absolute;left:6px;top:6px;width:5px;height:9px;border:solid var(--green);border-width:0 2.5px 2.5px 0;transform:rotate(45deg)}
.check b{color:#fff}
.tool-actions{margin-top:18px}
.calc-disc{margin-top:16px;font-size:.86rem;color:#9fb2c6}
.calc-disc b{color:#E4EDF6}

/* prose / articles */
.article{padding:34px 0 10px}
.prose{max-width:74ch;margin:0 auto}
.prose .lead{font-size:1.2rem;color:var(--inksoft)}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.3em}
.prose li{margin:.4em 0}
.prose h2{scroll-margin-top:88px}
.crumbs{font-size:.86rem;color:var(--inksoft);margin:0 0 10px}
.crumbs a{color:var(--inksoft)}
.post-meta{color:var(--inksoft);font-size:.92rem;margin-bottom:6px}
table{width:100%;border-collapse:collapse;margin:1.4em 0;font-size:.97rem}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line)}
th{font-family:var(--disp);background:var(--panel);font-size:.85rem;text-transform:uppercase;letter-spacing:.05em}

/* figures */
.ill-fig{margin:1.8em 0;text-align:center}
.ill-fig .ill{border-radius:var(--rad);box-shadow:var(--shadow);background:var(--panel)}
.ill-fig figcaption{font-size:.9rem;color:var(--inksoft);margin-top:10px;font-style:italic}

/* callouts */
.callout{display:flex;flex-direction:column;gap:6px;background:var(--panel);border-left:5px solid var(--blue);border-radius:12px;padding:18px 22px;margin:1.7em 0}
.callout.tip{border-left-color:var(--green);background:#EAF3EC}
.callout.warn{border-left-color:var(--amber);background:#FBEFD9}
.callout-t{font-family:var(--disp);font-weight:700;color:var(--blueD)}
.callout.warn .callout-t{color:var(--amberD)}

/* product cards */
.prod-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin:1.6em 0}
.prod{display:flex;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--rad);padding:20px;box-shadow:var(--shadow)}
.prod-ic{flex:none;width:56px;height:56px;border-radius:12px;background:var(--panel);display:flex;align-items:center;justify-content:center}
.prod-body h4{margin:0 0 .3em}
.prod-why{font-size:.92rem;color:var(--inksoft);margin:0 0 .7em}
.prod-meta{margin:0;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.prod-price{font-family:var(--disp);font-weight:700;color:var(--green)}
.aff-btn{display:inline-block;background:var(--amber);color:#241008;font-family:var(--disp);font-weight:700;font-size:.9rem;padding:8px 15px;border-radius:9px;text-decoration:none}
.aff-btn:hover{background:var(--amberD);color:#fff}
.paid{font-size:.78rem;color:var(--inksoft)}

/* guide grid */
.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:34px}
.gcard{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);border-radius:var(--rad);overflow:hidden;box-shadow:var(--shadow);transition:transform .16s}
.gcard:hover{transform:translateY(-4px)}
.gcard .ill{display:block;border-bottom:1px solid var(--line)}
.gcard-body{padding:20px}
.gcard h3{margin:0 0 .35em;font-size:1.12rem}
.gcard h3 a{text-decoration:none;color:var(--blueD)}
.gcard h3 a:hover{color:var(--amberD)}
.gcard p{font-size:.93rem;color:var(--inksoft);margin:0}

/* faq + related */
.faq{max-width:74ch;margin:2em auto 0}
.faq details{border:1px solid var(--line);border-radius:12px;margin-bottom:12px;background:var(--card);overflow:hidden}
.faq summary{cursor:pointer;padding:16px 20px;font-family:var(--disp);font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";color:var(--amber);font-size:1.3rem;line-height:1}
.faq details[open] summary:after{content:"\2212"}
.faq details>div{padding:0 20px 16px;color:var(--inksoft)}
.related{max-width:74ch;margin:0 auto}
.related ul{list-style:none;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:10px}
.related a{display:block;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:13px 16px;text-decoration:none;color:var(--blueD);font-family:var(--disp);font-weight:600;font-size:.95rem}
.related a:hover{border-color:var(--amber);color:var(--amberD)}

/* cta */
.cta{background:linear-gradient(120deg,var(--blue),var(--blueD));color:#fff;border-radius:20px;padding:42px;text-align:center;margin:42px 0;position:relative;overflow:hidden}
.cta:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);background-size:26px 26px;opacity:.5}
.cta h2{color:#fff;position:relative}.cta p{color:#C7D6E6;max-width:56ch;margin:0 auto 22px;position:relative}
.cta .btn{position:relative}

/* shop + legal */
.shop-group{margin-top:36px}
.disc-box{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px 24px;margin:24px 0;font-size:.95rem;color:var(--inksoft)}
.page-head{background:var(--blueD);color:#fff;position:relative;overflow:hidden;padding:46px 0 38px}
.page-head:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);background-size:28px 28px;opacity:.5}
.page-head .wrap{position:relative}
.page-head h1{color:#fff}.page-head .kicker{color:var(--amber)}.page-head .crumbs,.page-head .crumbs a{color:#A9BED2}
.page-head .lede{color:#C7D6E6}
.legal{max-width:76ch;margin:0 auto;padding:34px 0}
.legal h2{font-size:1.35rem}.legal p,.legal li{color:#2a323d}

/* footer */
.site-foot{background:var(--char);color:#B6C6D8;margin-top:60px;padding:52px 0 0}
.foot-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1.1fr;gap:34px}
.foot-brand .brand-name{display:inline-block;font-size:1.16rem;color:#fff}
.foot-brand .brand-name b{color:var(--amber)}
.foot-brand .logo-mark{vertical-align:middle;margin-right:8px}
.foot-brand p{font-size:.91rem;color:#8FA3B6;margin-top:12px}
.foot-brand .disc-eng{color:#D9C39A;font-size:.86rem}
.foot-brand .amz{font-size:.82rem;color:#76889a;font-style:italic}
.foot-col h3{color:#fff;font-size:.84rem;text-transform:uppercase;letter-spacing:.1em;margin:0 0 12px}
.foot-col ul{list-style:none;padding:0;margin:0}.foot-col li{margin:.45em 0}
.foot-col a{color:#B6C6D8;text-decoration:none;font-size:.93rem}.foot-col a:hover{color:var(--amber)}
.foot-bar{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid #2c3947;margin-top:42px;padding:20px 0 26px;font-size:.83rem;color:#76889a}

/* to-top */
.to-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;border:0;background:var(--blue);color:#fff;font-size:1.3rem;cursor:pointer;opacity:0;pointer-events:none;transition:.25s;z-index:90;box-shadow:var(--shadow)}
.to-top.show{opacity:1;pointer-events:auto}.to-top:hover{background:var(--amber);color:#241008}

@media(max-width:880px){
  .nav-toggle{display:flex}
  .site-nav{position:fixed;inset:66px 0 auto 0;background:var(--paper);border-bottom:1px solid var(--line);max-height:0;overflow:hidden;transition:max-height .3s}
  body.nav-open .site-nav{max-height:70vh}
  .site-nav ul{flex-direction:column;padding:10px 22px}
  .site-nav a{display:block;padding:13px 8px;border-bottom:1px solid var(--line)}
  body.nav-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  body.nav-open .nav-toggle span:nth-child(2){opacity:0}
  body.nav-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .hero .wrap{grid-template-columns:1fr;gap:30px;padding-top:42px}
  .hero-art{order:-1;max-width:460px}
  .feat-grid,.guide-grid{grid-template-columns:1fr}
  .prod-grid,.related ul{grid-template-columns:1fr}
  .form2{grid-template-columns:1fr 1fr}
  .tool{padding:26px}
  .foot-grid{grid-template-columns:1fr 1fr}
  body{font-size:17px}
}
@media(max-width:520px){.form2{grid-template-columns:1fr}.foot-grid{grid-template-columns:1fr}.cta,.tool{padding:24px 20px}.spec-grid{grid-template-columns:1fr}.sp-k{margin-top:6px}}