:root{--navy:#1f3a5f;--navy-2:#16304f;--ink:#1b2230;--muted:#5b6678;--line:#e3e8ef;--bg:#f6f8fb;--gold:#e0a419;--gold-soft:#fff3cf;--radius:14px;--w:1120px}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.6;font-size:17px}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy)}
a:hover{color:#0e2440}
.wrap{max-width:var(--w);margin:0 auto;padding:0 22px}
.narrow{max-width:760px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px;z-index:9}
.site-header{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:5}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:700;font-size:19px;letter-spacing:-.01em}
.brand img{border-radius:8px}
.nav{display:flex;gap:22px}
.nav a{text-decoration:none;color:var(--muted);font-weight:500;font-size:15px}
.nav a:hover,.nav a[aria-current]{color:var(--navy)}
.nav a[aria-current]{font-weight:600}
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;color:var(--ink)}
h1{font-size:clamp(30px,4.4vw,46px);margin:.2em 0 .4em}
h2{font-size:clamp(23px,2.6vw,30px);margin:1.8em 0 .6em}
h3{font-size:19px;margin:1.5em 0 .4em}
.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-size:12.5px;font-weight:700;color:#b07d05;margin:0}
.lead{font-size:clamp(17px,1.6vw,20px);color:var(--muted);max-width:40em}
.muted{color:var(--muted)}.small{font-size:14.5px}.center{text-align:center}
.btn{display:inline-block;background:var(--navy);color:#fff;text-decoration:none;font-weight:600;padding:12px 20px;border-radius:10px;border:2px solid var(--navy);font-size:16px;line-height:1.2;transition:background .15s}
.btn:hover{background:var(--navy-2);color:#fff}
.btn-ghost{background:#fff;color:var(--navy)}
.btn-ghost:hover{background:var(--bg);color:var(--navy)}
.btn-row{margin:1.4em 0}
.hero{background:linear-gradient(180deg,var(--bg),#fff);border-bottom:1px solid var(--line)}
.hero-inner{display:grid;grid-template-columns:1.05fr 1fr;gap:44px;align-items:center;padding-top:56px;padding-bottom:56px}
.hero-img{border-radius:var(--radius);overflow:hidden;box-shadow:0 18px 40px -18px rgba(31,58,95,.35);border:1px solid var(--line);background:#fff}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.section{padding-top:28px;padding-bottom:28px}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;display:flex;flex-direction:column;transition:box-shadow .15s}
.card:hover{box-shadow:0 12px 30px -16px rgba(31,58,95,.35)}
.card-img{position:relative;display:block;border-bottom:1px solid var(--line)}
.badge{position:absolute;top:12px;left:12px;background:var(--gold);color:#1b2230;font-weight:800;font-size:13px;padding:4px 10px;border-radius:999px;letter-spacing:.04em;text-transform:uppercase}
.card-body{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1}
.card-body h3{margin:.3em 0 .3em;font-size:21px}
.card-body h3 a{text-decoration:none;color:var(--ink)}
.card-body p{margin:.2em 0 .6em;color:var(--muted)}
.card-actions{margin-top:auto;display:flex;align-items:center;gap:16px;padding-top:10px}
.link{font-weight:600}
.ticks{list-style:none;padding:0;margin:.6em 0}
.ticks li{position:relative;padding-left:28px;margin:.45em 0}
.ticks li:before{content:"";position:absolute;left:2px;top:.45em;width:14px;height:8px;border-left:3px solid var(--gold);border-bottom:3px solid var(--gold);transform:rotate(-45deg)}
.ticks.small li{font-size:15px;margin:.25em 0}
.guide-list{list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}
.guide-list li a{display:block;padding:18px 4px;border-bottom:1px solid var(--line);text-decoration:none}
.guide-list li a:hover{background:var(--bg)}
.g-title{display:block;font-weight:700;font-size:19px;color:var(--ink)}
.g-sum{display:block;color:var(--muted);font-size:15.5px;margin-top:2px}
.contact-box,.cta-box{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:26px 28px;margin-top:28px;margin-bottom:48px}
.contact-box h2,.cta-box h2{margin-top:0}
.crumbs{font-size:14px;color:var(--muted);margin:0 0 6px}
.crumbs a{color:var(--muted)}
.article{padding-top:34px}
.article-head{max-width:820px}
.meta{color:var(--muted);font-size:15px;margin:0}
.article-grid{display:grid;grid-template-columns:230px minmax(0,720px);gap:48px;margin-top:28px}
.toc{position:sticky;top:84px;align-self:start;font-size:14.5px;border-left:3px solid var(--line);padding-left:16px}
.toc-title{font-weight:700;margin:0 0 6px;color:var(--ink)}
.toc ol{list-style:none;padding:0;margin:0}
.toc li{margin:6px 0}.toc a{color:var(--muted);text-decoration:none}.toc a:hover{color:var(--navy)}
.prose h2{scroll-margin-top:84px}
.prose h2:first-child{margin-top:0}
.prose blockquote{margin:1.2em 0;padding:16px 20px;background:var(--bg);border-left:4px solid var(--gold);border-radius:0 10px 10px 0;font-size:16px}
.prose blockquote p{margin:.5em 0}
.prose li{margin:.35em 0}
.prose ol,.prose ul{padding-left:1.3em}
.prose .ticks{padding-left:0}
.origin{color:var(--muted);font-size:14.5px;margin-top:2em;border-top:1px solid var(--line);padding-top:1em}
.tool-hero .hero-inner{align-items:start}
.price-row{display:flex;gap:14px;flex-wrap:wrap;margin:18px 0 10px}
.price-box{flex:1 1 200px;border:1px solid var(--line);background:#fff;border-radius:var(--radius);padding:16px 18px;display:flex;flex-direction:column;gap:4px}
.price-box .price{font-size:30px;font-weight:800;color:var(--ink);letter-spacing:-.02em}
.price-box span{color:var(--muted);font-size:14.5px}
.price-box .btn{margin-top:10px;text-align:center}
.note{font-size:14.5px;color:var(--muted)}
.steps li{margin:.5em 0}
.gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:18px}
.gallery figure{margin:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.gallery figcaption{padding:10px 14px;font-size:14.5px;color:var(--muted);border-top:1px solid var(--line)}
.table-wrap{overflow-x:auto}
.compare{width:100%;border-collapse:collapse;font-size:15.5px;margin:.6em 0}
.compare th,.compare td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
.compare thead th{background:var(--bg);font-size:14.5px}
.compare tbody th{font-weight:600}
.site-footer{border-top:1px solid var(--line);background:var(--bg);margin-top:40px;padding:32px 0 26px;font-size:15px}
.footer-inner{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}
.footer-brand p{color:var(--muted);margin:.5em 0 0}
.footer-links{display:flex;flex-wrap:wrap;gap:10px 22px;align-items:flex-start}
.footer-links a{color:var(--muted);text-decoration:none}.footer-links a:hover{color:var(--navy)}
.footer-note{color:var(--muted);font-size:14px;margin-top:18px}
@media (max-width:900px){
  .hero-inner{grid-template-columns:1fr;gap:28px;padding-top:36px;padding-bottom:36px}
  .article-grid{grid-template-columns:1fr;gap:10px}
  .toc{position:static;border-left:0;padding:14px 16px;background:var(--bg);border-radius:10px}
}
@media (max-width:640px){
  body{font-size:16.5px}
  .wrap{padding:0 18px}
  .cards,.gallery{grid-template-columns:1fr}
  .nav{gap:14px}.nav a{font-size:14px}
  .brand span{font-size:17px}
  .hero-actions .btn{flex:1 1 100%;text-align:center}
  .contact-box,.cta-box{padding:20px}
}
@media (max-width:370px){.nav a:first-child{display:none}}
.toc-cta{margin-top:22px;padding:14px;border:1px solid var(--line);border-radius:12px;background:#fff}
.toc-cta p{margin:0 0 10px;color:var(--muted);font-size:14px;line-height:1.45}
.toc-cta strong{color:var(--ink)}
.btn-sm{padding:8px 14px;font-size:14.5px}
@media (max-width:900px){.toc-cta{display:none}}
.toc .btn{color:#fff}
.contact-box p{margin-bottom:0}
@media (max-width:640px){.hero:not(.tool-hero) .hero-img{display:none}.hero-inner{padding-top:28px}}
/* guide 3: wide tables and code blocks scroll inside the column on small screens */
.prose table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse;margin:1rem 0;font-size:.95em}
.prose th,.prose td{border:1px solid #d9dee5;padding:.45rem .6rem;text-align:left;vertical-align:top}
.prose th{background:#f3f5f8}
.prose pre{max-width:100%;overflow-x:auto;background:#f6f7f9;border:1px solid #e3e7ec;border-radius:.4rem;padding:.8rem 1rem;font-size:.82em;line-height:1.5}
.prose pre code{white-space:pre}
.article-grid>*{min-width:0}