:root{
  --blue:#005884;
  --blue-dark:#003e61;
  --blue-deep:#073b56;
  --cyan:#eff8fc;
  --accent:#ff544d;
  --ink:#1c2630;
  --muted:#5e6d78;
  --border:#dfe7ec;
  --paper:#ffffff;
  --soft:#f7fafc;
  --shadow:0 18px 50px rgba(4, 36, 55, .13);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Arial, Helvetica, sans-serif;
  color:var(--ink);
  background:#fff;
  line-height:1.65;
  font-size:16px;
}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
img{display:block;max-width:100%;height:auto}
.wrap{width:min(1120px, calc(100% - 36px));margin-inline:auto}
.skip-link{position:absolute;left:-999px;top:12px;background:#fff;color:#000;padding:10px 14px;border-radius:8px;z-index:99}
.skip-link:focus{left:12px}
.topbar{background:var(--blue-dark);color:#fff;font-size:12px;letter-spacing:.04em;text-transform:uppercase}
.topbar__inner{display:flex;justify-content:space-between;gap:18px;padding:8px 0;font-weight:700}
.site-header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50;box-shadow:0 1px 0 rgba(0,0,0,.02)}
.brand-row{display:flex;justify-content:space-between;align-items:center;padding:20px 0}
.brand{display:inline-flex;align-items:center;font-size:28px;line-height:1;font-weight:400;color:#7d858b;letter-spacing:-.04em}
.brand:hover{text-decoration:none}
.brand__mark{background:var(--blue);color:#fff;padding:4px 7px 5px;border-radius:3px;letter-spacing:-.06em}
.brand__text{margin-left:4px;color:#7d858b}
.menu-toggle{display:none;border:1px solid var(--border);background:#fff;border-radius:8px;padding:8px 12px;font-weight:700;color:var(--blue-dark)}
.main-nav{background:var(--blue);color:#fff}
.nav-wrap{display:flex;align-items:center;gap:0;min-height:48px}
.nav-link,.nav-search{position:relative;color:#fff;padding:15px 21px;font-size:13px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;border:0;background:transparent;font-family:inherit;cursor:pointer}
.nav-search{margin-left:auto}
.nav-link:hover,.nav-search:hover{text-decoration:none;background:rgba(255,255,255,.08)}
.nav-link.is-active::after{content:"";position:absolute;left:21px;right:21px;bottom:0;height:4px;background:var(--accent);border-radius:4px 4px 0 0}
.page{padding:42px 0 64px}
.article-card{background:linear-gradient(135deg,#fff, var(--soft));border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero{display:grid;grid-template-columns:.9fr 1.1fr;gap:32px;align-items:center;padding:34px;margin-bottom:34px;overflow:hidden}
.eyebrow{font-size:12px;font-weight:900;color:var(--accent);text-transform:uppercase;letter-spacing:.13em;margin:0 0 8px}
h1,h2,h3,h4{line-height:1.18;color:#18222b;margin:0 0 14px}
h1{font-size:clamp(38px,5vw,64px);letter-spacing:-.055em}
h2{font-size:clamp(26px,3vw,38px);letter-spacing:-.035em;margin-top:4px}
h3{font-size:26px;letter-spacing:-.025em}
h4{font-size:22px;letter-spacing:-.02em}
.lead{font-size:18px;color:#4c5a65;margin:0 0 24px;max-width:620px}
.hero__actions{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 18px;border-radius:9px;background:var(--accent);color:#fff;font-weight:800;box-shadow:0 8px 22px rgba(255,84,77,.28)}
.btn:hover{text-decoration:none;filter:brightness(.97)}
.btn--ghost{background:#fff;color:var(--blue-dark);border:1px solid var(--border);box-shadow:none}
.framed-image{border-radius:12px;overflow:hidden;background:#e5f1f6;box-shadow:0 14px 38px rgba(0,48,80,.16)}
.framed-image img{width:100%;height:100%;object-fit:cover}
.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:34px;align-items:start}
.main-column{min-width:0}
.article-section{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px;margin-bottom:24px;box-shadow:0 8px 30px rgba(12,37,54,.06)}
.article-section p{margin:0 0 16px;color:#33434f}
.article-section p:last-child{margin-bottom:0}
.article-section h2::after,.article-section h3::after,.article-section h4::after,.widget h2::after,.hero h1::after{
  content:"";display:block;width:64px;height:4px;background:var(--accent);border-radius:5px;margin-top:12px;margin-bottom:16px
}
.hero h1::after{margin-bottom:0}
.wide-image{border:1px solid var(--border);border-radius:13px;overflow:hidden;margin:18px 0 20px;background:#f6fbfd}
.wide-image img{width:100%}
.check-list{list-style:none;margin:18px 0 0;padding:0;display:grid;gap:8px}
.check-list li{position:relative;padding-left:28px;color:#33434f}
.check-list li::before{content:"✓";position:absolute;left:0;top:0;color:var(--blue);font-weight:900}
.sidebar{position:sticky;top:154px;display:grid;gap:20px}
.widget{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:0 8px 30px rgba(12,37,54,.06)}
.widget h2{font-size:20px;margin-bottom:8px}
.search-form{display:grid;grid-template-columns:1fr auto;gap:8px}
.search-form input{min-width:0;border:1px solid var(--border);border-radius:9px;padding:12px 12px;font:inherit;color:var(--ink);background:#fff}
.search-form button{border:0;border-radius:9px;background:var(--blue);color:#fff;font-weight:800;padding:0 14px;cursor:pointer}
.toc-widget{display:grid;gap:6px}
.toc-widget a{display:block;padding:9px 0;border-bottom:1px solid var(--border);font-weight:700;color:var(--blue-dark)}
.toc-widget a:last-child{border-bottom:0}
.safety-widget{background:linear-gradient(180deg,#eef8fc,#fff)}
.safety-widget p{margin:0;color:#4a5a66;font-size:14px}
.site-footer{background:var(--blue-deep);color:#cfe6f2;padding:44px 0;margin-top:20px}
.site-footer h2{font-size:22px;color:#fff;margin:0 0 10px}
.site-footer p{margin:0;color:#cfe6f2;max-width:650px}
.footer-grid{display:grid;grid-template-columns:1fr 300px;gap:40px;align-items:start}
.footer-links{display:grid;gap:8px}
.footer-links a{color:#fff;font-weight:700}
.back-top{position:fixed;right:22px;bottom:22px;width:44px;height:44px;border:0;border-radius:50%;background:#fff;color:var(--blue-dark);box-shadow:0 10px 30px rgba(0,0,0,.22);font-size:24px;font-weight:900;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(12px);transition:.2s ease;z-index:60}
.back-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
.search-modal{position:fixed;inset:0;background:rgba(0,20,35,.62);display:none;align-items:center;justify-content:center;padding:20px;z-index:80}
.search-modal.is-open{display:flex}
.search-modal__panel{background:#fff;border-radius:18px;padding:26px;width:min(560px,100%);box-shadow:0 30px 90px rgba(0,0,0,.35)}
.modal-close{display:block;margin-left:auto;border:0;background:transparent;color:var(--muted);font-weight:800;cursor:pointer;padding:0 0 18px}
.search-form--modal{grid-template-columns:1fr;gap:10px}
.search-form--modal label{font-weight:900;color:#1c2630}
.search-form--modal button{height:46px}
.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}
@media (max-width: 900px){
  .topbar__inner{display:block;text-align:center}.topbar__right{display:none}
  .menu-toggle{display:inline-flex}.main-nav{display:none}.main-nav.is-open{display:block}
  .nav-wrap{display:grid;width:100%;gap:0}.nav-search{margin-left:0;text-align:left}.nav-link,.nav-search{padding:14px 0}
  .nav-link.is-active::after{left:0;right:auto;width:68px}
  .hero{grid-template-columns:1fr;padding:24px}.content-grid{grid-template-columns:1fr}.sidebar{position:static}.footer-grid{grid-template-columns:1fr}
}
@media (max-width: 560px){
  .wrap{width:min(100% - 24px,1120px)}.brand{font-size:24px}.hero{padding:20px}.article-section{padding:20px}.search-form{grid-template-columns:1fr}.search-form button{min-height:44px}
}