:root{
  color-scheme:light;
  --bg:#f8fafc; --surface:#ffffff; --surface-2:#f1f5f9; --ink:#0f172a; --muted:#64748b;
  --line:#e2e8f0; --brand:#2563eb; --brand-2:#1d4ed8; --brand-soft:#eff6ff;
  --accent:#0ea5e9; --accent-soft:#e0f2fe; --warn:#92400e; --warn-bg:#fffbeb; --warn-line:#fde68a;
  --radius:16px; --radius-sm:10px;
  --shadow:0 4px 6px -1px rgba(15,23,42,.05),0 2px 4px -1px rgba(15,23,42,.03);
  --shadow-sm:0 1px 2px 0 rgba(15,23,42,.04);
  --shadow-lg:0 10px 15px -3px rgba(15,23,42,.07),0 4px 6px -2px rgba(15,23,42,.03);
  --max:1120px; --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --serif:ui-serif,Georgia,Cambria,"Times New Roman",serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}
img,svg{max-width:100%;height:auto}
a{color:var(--brand);text-underline-offset:3px}
a:hover{color:var(--brand-2)}
:focus-visible{outline:3px solid var(--brand);outline-offset:3px;border-radius:4px}
.skip{position:absolute;left:-9999px;top:0;background:var(--surface);color:var(--ink);padding:.75rem 1rem;z-index:100}
.skip:focus{left:1rem;top:1rem}
.wrap{width:min(100% - 2rem,var(--max));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line);box-shadow:var(--shadow-sm)}
.header-inner{display:flex;align-items:center;gap:1rem;min-height:68px}
.brand{display:flex;align-items:center;gap:.65rem;text-decoration:none;color:var(--ink);font-weight:750;letter-spacing:-.02em;font-size:1.05rem;flex:0 0 auto}
.brand-logo{height:42px;width:auto;display:block}
.brand small{display:block;font-weight:500;color:var(--muted);font-size:.72rem;letter-spacing:.02em}
.nav{margin-left:auto;display:flex;align-items:center;gap:.15rem;flex-wrap:wrap}
.nav a{padding:.5rem .85rem;border-radius:999px;color:#475569;text-decoration:none;font-size:.92rem;font-weight:600;transition:color .15s ease,background .15s ease}
.nav a:hover{background:var(--brand-soft);color:var(--brand)}
.nav .nav-cta{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;margin-left:.45rem;padding:.55rem 1.15rem;box-shadow:0 2px 6px rgba(37,99,235,.25);transition:transform .15s ease,box-shadow .15s ease,background .15s ease}
.nav .nav-cta:hover{background:linear-gradient(135deg,var(--brand-2),var(--brand-2));color:#fff;transform:translateY(-1px);box-shadow:0 6px 14px rgba(37,99,235,.3)}
.menu-toggle{display:none}
@media (max-width:820px){
  .header-inner{flex-wrap:wrap;padding-block:.55rem}
  .brand-logo{height:36px}
  .menu-toggle{display:block;margin-left:auto;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:.45rem .85rem;font:inherit;font-size:.9rem;font-weight:650}
  .nav{display:none;width:100%;margin:0;padding:.35rem 0 .6rem;border-top:1px solid var(--line)}
  .nav.open{display:flex}
  .nav a{flex:1 1 40%}
}
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);background:
  radial-gradient(1000px 420px at 82% -10%,var(--brand-soft),transparent 62%),
  radial-gradient(700px 300px at -5% 110%,var(--accent-soft),transparent 60%)}
.hero-inner{padding:clamp(2.4rem,6vw,4.6rem) 0 clamp(2rem,5vw,3.8rem);display:grid;grid-template-columns:1.35fr .65fr;gap:2.4rem;align-items:center}
@media (max-width:860px){.hero-inner{grid-template-columns:1fr;gap:1.4rem}}
.kicker{display:inline-flex;align-items:center;gap:.45rem;font-size:.78rem;font-weight:750;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);background:var(--brand-soft);padding:.35rem .7rem;border-radius:999px;margin:0 0 1rem}
h1,h2,h3{line-height:1.18;letter-spacing:-.025em;margin:0 0 .6rem}
h1{font-size:clamp(2rem,4.6vw,3.35rem);font-weight:800}
h2{font-size:clamp(1.45rem,2.6vw,2rem);font-weight:780;margin-top:2.2rem}
h3{font-size:1.15rem;font-weight:730}
.hero p{font-size:clamp(1.02rem,1.6vw,1.18rem);color:var(--muted);max-width:62ch;margin:0 0 1.4rem}
.lede{font-size:1.12rem;color:var(--muted);max-width:70ch}
.actions{display:flex;flex-wrap:wrap;gap:.7rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;padding:.8rem 1.25rem;border-radius:999px;font-weight:650;text-decoration:none;border:1.5px solid transparent;transition:transform .15s ease,box-shadow .15s ease,background .15s ease,color .15s ease}
.btn:active{transform:translateY(1px)}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 2px 8px rgba(37,99,235,.22)}
.btn-primary:hover{background:linear-gradient(135deg,var(--brand-2),var(--brand-2));color:#fff;box-shadow:0 6px 16px rgba(37,99,235,.28);transform:translateY(-1px)}
.btn-ghost{background:var(--surface);border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);background:var(--brand-soft)}
.hero-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.35rem;box-shadow:var(--shadow)}
.hero-card h2{margin:0 0 .5rem;font-size:1.08rem}
.hero-card ul{margin:.2rem 0 0;padding-left:1.1rem;color:var(--muted);font-size:.95rem}
.section{padding:clamp(2.2rem,5vw,3.6rem) 0}
.section-tight{padding:1.6rem 0}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:1rem;margin-bottom:1.2rem;flex-wrap:wrap}
.section-head p{color:var(--muted);margin:.2rem 0 0;max-width:65ch}
.grid{display:grid;gap:1rem}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:620px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.35rem;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:.45rem;transition:box-shadow .2s ease,border-color .2s ease,transform .15s ease}
.card h3{margin:0;font-size:1.06rem}
.card p{margin:0;color:var(--muted);font-size:.94rem}
.card .card-link{margin-top:auto;padding-top:.55rem;font-weight:700;text-decoration:none;font-size:.92rem}
.card:hover{border-color:#cbd5e1;box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.pill{display:inline-block;font-size:.72rem;font-weight:750;letter-spacing:.03em;text-transform:uppercase;background:var(--surface-2);color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:.18rem .55rem}
.pill-brand{background:var(--brand-soft);color:var(--brand);border-color:transparent}
.breadcrumbs{font-size:.84rem;color:var(--muted);background:var(--surface);border-bottom:1px solid var(--line);padding:.7rem 0}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:.35rem;list-style:none;margin:0;padding:0}
.breadcrumbs li+li::before{content:"/";margin-right:.35rem;color:#cbd5e1}
.breadcrumbs a{color:#475569;text-decoration:none}
.breadcrumbs a:hover{color:var(--brand);text-decoration:underline}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:2.6rem;padding:1.6rem 0 3rem;align-items:start}
@media (max-width:960px){.layout{grid-template-columns:1fr;gap:1.6rem}}
.prose{min-width:0}
.prose p{margin:0 0 1rem}
.prose ul,.prose ol{margin:0 0 1.1rem;padding-left:1.25rem}
.prose li{margin:.3rem 0}
.prose h2{margin-top:2rem;scroll-margin-top:90px}
.prose h3{margin-top:1.5rem;scroll-margin-top:90px}
.prose table{width:100%;border-collapse:collapse;margin:1rem 0 1.4rem;font-size:.94rem}
.prose th,.prose td{text-align:left;padding:.7rem .75rem;border-bottom:1px solid var(--line);vertical-align:top}
.prose th{background:var(--surface-2);font-weight:720}
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius-sm)}
.search-form{margin:1.2rem 0 .8rem}
.search-form label{display:block;font-weight:700;margin:0 0 .45rem}
.search-row{display:flex;gap:.6rem;flex-wrap:wrap}
.search-row input{flex:1 1 20rem;padding:.8rem .9rem;border:1.5px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink);font:inherit}
.search-row input:focus{border-color:var(--brand);outline:none}
.search-results{display:grid;gap:.7rem;margin-top:1rem}
.search-result{display:block;padding:1rem;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface);text-decoration:none;color:var(--ink);box-shadow:var(--shadow-sm)}
.search-result:hover{border-color:var(--brand);color:var(--ink);box-shadow:var(--shadow)}
.search-result h2{font-size:1.02rem;margin:.1rem 0 .2rem}
.search-result p{margin:0;color:var(--muted);font-size:.9rem}
.checklist{list-style:none;padding:0;margin:0 0 1.1rem;display:grid;gap:.5rem}
.checklist li{position:relative;padding-left:1.9rem;margin:0}
.checklist li::before{content:"";position:absolute;left:0;top:.42em;width:1.1rem;height:1.1rem;border-radius:50%;background:var(--brand-soft);border:1px solid color-mix(in srgb,var(--brand) 35%,transparent)}
.checklist li::after{content:"";position:absolute;left:.34rem;top:.63em;width:.42rem;height:.22rem;border-left:2px solid var(--brand);border-bottom:2px solid var(--brand);transform:rotate(-45deg)}
.callout{background:var(--warn-bg);border:1px solid var(--warn-line);border-radius:var(--radius-sm);padding:1rem 1.1rem;margin:1.2rem 0;font-size:.95rem;color:#78350f}
.callout strong{color:var(--warn)}
.callout-info{background:var(--brand-soft);border-color:#bfdbfe;color:#1e3a8a}
.callout-info strong{color:var(--brand-2)}
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:.8rem;margin:1rem 0 1.4rem}
@media (max-width:620px){.stat-row{grid-template-columns:1fr}}
.stat{background:var(--surface-2);border-radius:var(--radius-sm);padding:.85rem 1rem}
.stat b{display:block;font-size:1.35rem;letter-spacing:-.03em}
.stat span{font-size:.82rem;color:var(--muted)}
.product{display:grid;grid-template-columns:1fr auto;gap:1rem;align-items:start;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.15rem;margin:0 0 .9rem;box-shadow:var(--shadow-sm)}
@media (max-width:640px){.product{grid-template-columns:1fr}}
.product h3{margin:0 0 .2rem}
.product .meta{font-size:.82rem;color:var(--muted);margin:0 0 .5rem}
.product ul{margin:.2rem 0 .8rem;padding-left:1.1rem;font-size:.92rem;color:var(--muted)}
.product .price{font-weight:750;color:var(--ink);font-size:.95rem;margin:.2rem 0}
.product .cta{display:flex;flex-direction:column;gap:.4rem;min-width:180px}
.sidebar{position:sticky;top:88px;display:grid;gap:1rem}
@media (max-width:960px){.sidebar{position:static}}
.sidebar .card{padding:1.1rem}
.sidebar h2{font-size:.95rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 .6rem}
.sidebar ul{list-style:none;margin:0;padding:0;font-size:.92rem}
.sidebar li{padding:.35rem 0;border-bottom:1px solid var(--line)}
.sidebar li:last-child{border-bottom:0}
.sidebar a{text-decoration:none}
.toc ol{margin:0;padding-left:1.1rem;font-size:.9rem}
.toc li{margin:.3rem 0}
.faq details{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface);padding:.9rem 1rem;margin:0 0 .6rem;box-shadow:var(--shadow-sm)}
.faq summary{font-weight:700;cursor:pointer;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--brand);font-weight:800}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:.6rem 0 0;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:.45rem;margin:.6rem 0 1rem}
.chips a{display:inline-block;padding:.38rem .75rem;border-radius:999px;background:var(--surface);border:1px solid var(--line);text-decoration:none;font-size:.86rem;color:#475569}
.chips a:hover{border-color:var(--brand);color:var(--brand);background:var(--brand-soft)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
@media (max-width:720px){.split{grid-template-columns:1fr}}
.compare-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.2rem;box-shadow:var(--shadow-sm)}
.compare-card h3{margin-top:0}
.disclosure{font-size:.84rem;color:var(--muted);background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius-sm);padding:.8rem 1rem;margin:1.2rem 0}
.site-footer{border-top:1px solid var(--line);background:var(--surface);margin-top:2.4rem;padding:2.4rem 0 1.2rem;font-size:.9rem;color:var(--muted)}
.site-footer .brand{margin-bottom:.75rem}
.site-footer .brand-logo{height:38px;width:auto;display:block}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:1.6rem}
@media (max-width:820px){.footer-grid{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.footer-grid{grid-template-columns:1fr}}
.site-footer h2{font-size:.8rem;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:0 0 .6rem}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:.3rem 0}
.site-footer a{text-decoration:none;color:#475569}
.site-footer a:hover{color:var(--brand);text-decoration:underline}
.footer-bottom{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:1.6rem;padding-top:1rem;color:var(--muted);font-size:.82rem}
.badge-row{display:flex;flex-wrap:wrap;gap:.5rem;margin:.8rem 0}
.badge{display:inline-flex;align-items:center;gap:.35rem;font-size:.78rem;font-weight:650;color:#475569;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:.28rem .65rem}
.muted{color:var(--muted)}
.small{font-size:.86rem}
.center{text-align:center}
.mt0{margin-top:0}.mb0{margin-bottom:0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.guide-list{display:grid;gap:.8rem}
.guide-item{display:grid;grid-template-columns:44px 1fr;gap:.9rem;align-items:start;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1rem;box-shadow:var(--shadow-sm)}
.guide-num{width:44px;height:44px;border-radius:12px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;font-weight:800}
.guide-item h3{margin:.1rem 0 .2rem;font-size:1rem}
.guide-item p{margin:0;color:var(--muted);font-size:.9rem}
.sources{font-size:.88rem;color:var(--muted)}
.sources ol{padding-left:1.2rem}
.timeline{border-left:3px solid var(--brand-soft);padding-left:1.1rem;margin:1rem 0}
.timeline h3{margin-bottom:.2rem}