:root{
  --blue:#276d95; --blue-dark:#1d5373; --ink:#1f2a33; --muted:#5b6770;
  --green:#5a7a3a; --bg-soft:#eef5f8; --line:#dde6ea; --white:#fff;
  --warn-bg:#fff6e5; --warn-line:#e9b949; --ok-bg:#eef7ea; --ok-line:#7aa55a;
  --radius:8px; --max:1160px;
  --font:Arial,"Helvetica Neue",Helvetica,system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--white);line-height:1.65;font-size:17px}
img{max-width:100%}
a{color:var(--blue)}
a:hover{color:var(--blue-dark)}
:focus-visible{outline:3px solid #f0a500;outline-offset:2px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:99}

/* header */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:78px;gap:16px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink)}
.brand-mark{width:46px;height:46px;border-radius:8px;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:700;font-size:18px;letter-spacing:.5px}
.brand-text{line-height:1.2}
.brand-text strong{display:block;font-size:17px}
.brand-text span{display:block;font-size:14px;color:var(--muted)}
.nav ul{list-style:none;margin:0;padding:0;display:flex;gap:26px}
.nav a{text-decoration:none;color:var(--blue-dark);font-weight:600;font-size:16px}
.nav a[aria-current="page"],.nav a:hover{color:var(--blue);text-decoration:underline;text-underline-offset:6px}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:6px;padding:8px 12px;font-size:15px;font-weight:600;color:var(--blue-dark);cursor:pointer}

/* hero */
.hero{background:linear-gradient(180deg,#eaf3f7,#f4f8fa);padding:72px 0 80px}
.hero-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:56px;align-items:center}
.kicker{color:var(--green);font-weight:700;font-size:15px;margin:0 0 12px}
.hero h1{font-size:clamp(34px,5vw,54px);line-height:1.15;margin:0 0 20px;letter-spacing:-.5px}
.hero p.lead{font-size:19px;color:var(--muted);max-width:40em;margin:0 0 28px}
.btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:14px 22px;border-radius:6px;font-weight:700;text-decoration:none;font-size:16px;border:2px solid var(--blue)}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark);border-color:var(--blue-dark);color:#fff}
.btn-outline{background:#fff;color:var(--blue-dark)}
.btn-outline:hover{background:var(--bg-soft)}
.topics-box{background:#fff;border:1px solid var(--line);border-radius:10px;padding:28px 30px;box-shadow:0 10px 30px rgba(39,109,149,.08)}
.topics-box h2{margin:0 0 14px;font-size:28px}
.topics-box ul{margin:0;padding-left:20px}
.topics-box li{margin:8px 0}
.topics-box a{color:var(--ink);text-decoration:none}
.topics-box a:hover{color:var(--blue);text-decoration:underline}

/* sections */
section.block{padding:64px 0}
section.block.alt{background:var(--bg-soft)}
.section-head{max-width:720px;margin-bottom:28px}
.section-head h2{font-size:32px;margin:0 0 8px}
.section-head p{color:var(--muted);margin:0}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column}
.card .cat{flex:none;font-size:14px;font-weight:700;color:var(--green);margin:0 0 6px}
.card h3{margin:0 0 10px;font-size:21px;line-height:1.3}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a:hover{color:var(--blue);text-decoration:underline}
.card p{color:var(--muted);margin:0 0 16px;flex:1}
.card .meta{font-size:14px;color:var(--muted)}
.read-link{font-weight:700;text-decoration:none}
.promise{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}
.promise h3{margin:0 0 6px;font-size:19px}
.promise p{margin:0;color:var(--muted)}

/* page header */
.page-head{background:var(--bg-soft);padding:48px 0 40px;border-bottom:1px solid var(--line)}
.page-head h1{margin:0 0 10px;font-size:clamp(30px,4vw,42px);line-height:1.2}
.page-head p{margin:0;color:var(--muted);max-width:44em;font-size:18px}
.crumbs{font-size:14px;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted)}

/* article */
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;padding:48px 0 72px}
.prose{max-width:760px}
.prose h2{font-size:27px;margin:40px 0 12px;line-height:1.3}
.prose h3{font-size:21px;margin:28px 0 8px}
.prose p,.prose li{font-size:18px}
.prose li{margin:6px 0}
.prose code{background:#f1f4f6;border:1px solid var(--line);border-radius:4px;padding:1px 6px;font-size:.92em;font-family:Consolas,"Courier New",monospace}
.prose .cmd{display:block;background:#1f2a33;color:#e8f1f5;padding:12px 16px;border-radius:6px;font-family:Consolas,"Courier New",monospace;font-size:16px;overflow-x:auto;margin:10px 0 16px;white-space:pre}
.article-meta{font-size:15px;color:var(--muted);margin-top:12px}
.note{border-left:4px solid var(--blue);background:var(--bg-soft);padding:14px 18px;border-radius:0 6px 6px 0;margin:20px 0}
.note.warn{border-color:var(--warn-line);background:var(--warn-bg)}
.note.ok{border-color:var(--ok-line);background:var(--ok-bg)}
.note p{margin:0}
.note strong{display:block;margin-bottom:4px}
.toc{border:1px solid var(--line);border-radius:var(--radius);padding:18px 22px;margin:24px 0}
.toc strong{display:block;margin-bottom:6px}
.toc ol{margin:0;padding-left:22px}
.toc li{font-size:16px;margin:4px 0}
.sidebar .side-box{border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:22px;background:#fff}
.sidebar h2{font-size:18px;margin:0 0 10px}
.sidebar ul{margin:0;padding-left:18px}
.sidebar li{margin:7px 0;font-size:15px}
.sidebar p{font-size:15px;color:var(--muted);margin:0}
.sidebar-sticky{position:sticky;top:100px}
.table-wrap{overflow-x:auto;margin:20px 0;border:1px solid var(--line);border-radius:var(--radius)}
table{border-collapse:collapse;width:100%;min-width:640px;font-size:16px}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--bg-soft);font-weight:700}
tr:last-child td{border-bottom:none}
.pros-cons{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:12px 0 20px}
.pros-cons div{border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px}
.pros-cons h4{margin:0 0 6px;font-size:16px}
.pros-cons ul{margin:0;padding-left:18px}
.pros-cons li{font-size:16px}
.faq details{border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px;margin:10px 0}
.faq summary{font-weight:700;cursor:pointer;font-size:17px}
.faq details p{margin:10px 0 0}

/* legal/text pages */
.text-page{padding:48px 0 72px}
.text-page .prose h2{font-size:24px}

/* contact */
.contact-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;padding:48px 0 72px}
.form-row{margin-bottom:18px}
label{display:block;font-weight:700;margin-bottom:6px;font-size:16px}
input,select,textarea{width:100%;padding:12px 14px;border:1px solid #b9c7ce;border-radius:6px;font:inherit;font-size:16px;background:#fff;color:var(--ink)}
textarea{min-height:160px;resize:vertical}
.hint{font-size:14px;color:var(--muted);margin-top:4px}
.form-status{margin-top:14px;font-size:15px}
button.btn{cursor:pointer;font-family:inherit}

/* category list */
.cat-section{padding:36px 0;border-bottom:1px solid var(--line)}
.cat-section:last-child{border-bottom:none}
.cat-section h2{margin:0 0 6px;font-size:26px}
.cat-section > p{color:var(--muted);margin:0 0 16px}
.cat-section ul{margin:0;padding-left:20px}
.cat-section li{margin:6px 0}

/* footer */
.site-footer{background:#1d3a4c;color:#d6e3ea;padding:52px 0 24px;font-size:15px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
.site-footer h2{color:#fff;font-size:16px;margin:0 0 12px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:7px 0}
.site-footer a{color:#d6e3ea;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.footer-bottom{border-top:1px solid #33566b;margin-top:36px;padding-top:18px;font-size:13.5px;color:#a9bfcb}
.footer-bottom p{margin:6px 0}

@media (max-width:900px){
  .hero-grid,.article-layout,.contact-grid{grid-template-columns:1fr}
  .grid-3,.promise{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .sidebar-sticky{position:static}
}
@media (max-width:760px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;top:78px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line)}
  .nav.open{display:block}
  .nav ul{flex-direction:column;gap:0;padding:8px 24px 16px}
  .nav li a{display:block;padding:10px 0}
  .grid-3,.grid-2,.promise,.pros-cons{grid-template-columns:1fr}
  .hero{padding:48px 0 56px}
  body{font-size:16px}
  .prose p,.prose li{font-size:17px}
}
@media (max-width:480px){.footer-grid{grid-template-columns:1fr}.brand-text span{display:none}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}