:root{
  --navy:#0f172a;--blue:#2563eb;--blue-dark:#1d4ed8;--sky:#dbeafe;
  --light:#f8fafc;--white:#ffffff;--text:#1e293b;--muted:#64748b;
  --border:#e2e8f0;--green:#15803d;--gold:#b45309;--red:#b91c1c;
  --shadow:0 18px 45px rgba(15,23,42,.08);--radius:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--text);background:var(--white);line-height:1.68}
img{max-width:100%;height:auto}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(1180px,92%);margin:auto}
.topbar{background:var(--navy);color:#fff;font-size:.92rem;padding:.48rem 0}
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.97);border-bottom:1px solid var(--border);backdrop-filter:blur(10px)}
.nav{display:flex;align-items:center;justify-content:space-between;min-height:74px;gap:1rem}
.logo{font-size:1.28rem;font-weight:900;color:var(--navy)}
.logo span{color:var(--blue)}
.nav-links{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.nav-links a{color:var(--text);font-weight:700;font-size:.93rem}
.menu-btn{display:none;border:1px solid var(--border);background:#fff;border-radius:8px;padding:.55rem .75rem;font-weight:800}
.btn{display:inline-block;background:var(--blue);color:#fff!important;padding:.85rem 1.18rem;border-radius:10px;font-weight:900;border:0;cursor:pointer}
.btn:hover{background:var(--blue-dark);text-decoration:none}
.btn.secondary{background:#fff;color:var(--blue)!important;border:1px solid var(--blue)}
.btn.dark{background:var(--navy)}
.hero{padding:5.25rem 0;background:linear-gradient(135deg,#eff6ff 0%,#fff 58%,#f0fdf4 100%)}
.hero-grid{display:grid;grid-template-columns:1.35fr .8fr;gap:3rem;align-items:center}
.eyebrow{font-size:.83rem;font-weight:900;letter-spacing:.09em;text-transform:uppercase;color:var(--blue)}
h1,h2,h3,h4{color:var(--navy);line-height:1.16}
h1{font-size:clamp(2.35rem,5.2vw,4.65rem);margin:.6rem 0 1rem}
h2{font-size:clamp(1.8rem,3vw,2.7rem);margin:0 0 1rem}
h3{font-size:1.28rem}
.lead{font-size:1.2rem;max-width:780px}
.hero-actions,.cta-row{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.4rem}
.trust{display:flex;gap:1rem;flex-wrap:wrap;color:var(--muted);font-weight:700;font-size:.94rem;margin-top:1.25rem}
section{padding:4.5rem 0}
.alt{background:var(--light)}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.3rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.card,.price-card,.stat,.faq details,.calculator{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:1.4rem;box-shadow:var(--shadow)}
.card.accent{border-top:5px solid var(--blue)}
.badge{display:inline-block;background:var(--sky);color:#1e40af;border-radius:999px;padding:.3rem .7rem;font-weight:900;font-size:.8rem}
.stat strong{display:block;font-size:2rem;color:var(--blue)}
.kicker{color:var(--green);font-weight:900}
.notice{background:#fffbeb;border-left:5px solid var(--gold);padding:1rem 1.2rem;border-radius:8px}
.success{background:#f0fdf4;border-left:5px solid var(--green);padding:1rem 1.2rem;border-radius:8px}
.warning{background:#fef2f2;border-left:5px solid var(--red);padding:1rem 1.2rem;border-radius:8px}
.clean{padding-left:1.15rem}
.clean li{margin:.42rem 0}
table{width:100%;border-collapse:collapse;background:#fff}
th,td{padding:.9rem;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}
th{background:#eff6ff;color:var(--navy)}
.faq details{margin:.75rem 0;box-shadow:none}
.faq summary{cursor:pointer;font-weight:900;color:var(--navy)}
.breadcrumbs{font-size:.9rem;color:var(--muted);margin-bottom:1rem}
.page-hero{padding:3.8rem 0;background:#eff6ff}
.page-hero h1{font-size:clamp(2.2rem,4.2vw,3.8rem)}
.page-hero p{max-width:850px}
.sticky-cta{position:fixed;right:18px;bottom:18px;z-index:50}
.calculator label{display:block;font-weight:800;margin-top:.8rem}
.calculator input,.calculator select,.calculator textarea{width:100%;padding:.8rem;border:1px solid var(--border);border-radius:8px;margin-top:.35rem;font:inherit}
.result{margin-top:1rem;padding:1rem;border-radius:10px;background:#eff6ff;font-weight:800}
.footer{background:var(--navy);color:#cbd5e1;padding:3.2rem 0}
.footer h3{color:#fff}
.footer a{color:#fff}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:2rem}
.small{font-size:.88rem;color:var(--muted)}
.section-nav{display:flex;flex-wrap:wrap;gap:.55rem;margin:1.2rem 0 0}
.section-nav a{background:#fff;border:1px solid var(--border);padding:.5rem .7rem;border-radius:999px;font-weight:800;font-size:.88rem}
.price{font-size:2.2rem;font-weight:900;color:var(--navy)}
.checklist{columns:2;column-gap:2rem}
.checklist li{break-inside:avoid;margin:.45rem 0}
.article-meta{font-size:.9rem;color:var(--muted)}
@media(max-width:900px){
  .hero-grid,.grid-2,.grid-3,.grid-4,.footer-grid{grid-template-columns:1fr}
  .nav-links{display:none;position:absolute;left:0;right:0;top:74px;background:#fff;padding:1rem 4%;border-bottom:1px solid var(--border)}
  .nav-links.open{display:flex;flex-direction:column;align-items:flex-start}
  .menu-btn{display:block}
  .sticky-cta{display:none}
  .checklist{columns:1}
}