:root {
  --blue-950:#071b4a; --blue-900:#0a2e79; --blue-800:#0d43a5; --blue-700:#155dd7;
  --blue-600:#2563eb; --blue-100:#eaf2ff; --blue-50:#f5f8ff;
  --ink:#101828; --muted:#667085; --line:#e4e7ec; --panel:#ffffff; --bg:#f6f8fc;
  --green:#079455; --shadow:0 12px 35px rgba(16,24,40,.08); --radius:16px;
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65}
a{color:var(--blue-700);text-decoration:none} a:hover{text-decoration:underline}
button,input{font:inherit}.layout{min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:300px;background:#fff;border-right:1px solid var(--line);z-index:50;display:flex;flex-direction:column}.brand{padding:25px 24px 18px;border-bottom:1px solid var(--line)}.brand-mark{display:flex;align-items:center;gap:11px;color:var(--blue-900);font-weight:800;font-size:20px}.brand-icon{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--blue-900),var(--blue-600));display:grid;place-items:center;color:#fff;font-weight:900}.brand small{display:block;color:var(--muted);font-weight:500;font-size:12px;margin:6px 0 0 47px}.search-wrap{padding:16px 18px 10px;position:relative}.search-box{display:flex;align-items:center;gap:8px;border:1px solid #d0d5dd;background:#fff;border-radius:10px;padding:0 11px;transition:.2s}.search-box:focus-within{border-color:var(--blue-600);box-shadow:0 0 0 3px rgba(37,99,235,.12)}.search-box input{border:0;outline:0;width:100%;height:42px;color:var(--ink);background:transparent}.search-clear{border:0;background:transparent;color:var(--muted);cursor:pointer;padding:4px;display:none}.search-results{position:absolute;left:18px;right:18px;top:62px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);max-height:360px;overflow:auto;display:none;z-index:60}.search-results.open{display:block}.search-result{display:block;padding:11px 13px;border-bottom:1px solid #f0f2f5}.search-result:last-child{border-bottom:0}.search-result:hover{background:var(--blue-50);text-decoration:none}.search-result strong{display:block;color:var(--ink);font-size:14px}.search-result span{display:block;color:var(--muted);font-size:12px;line-height:1.35;margin-top:3px}.search-empty{padding:14px;color:var(--muted);font-size:13px}.nav{padding:4px 12px 22px;overflow:auto;flex:1}.nav-section{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:#98a2b3;font-weight:800;padding:15px 12px 5px}.nav a{display:flex;align-items:center;gap:10px;color:#344054;padding:9px 12px;border-radius:9px;margin:2px 0;font-size:14px;font-weight:600}.nav a:hover{background:var(--blue-50);color:var(--blue-900);text-decoration:none}.nav a.active{background:var(--blue-100);color:var(--blue-900)}.nav a.child{padding-left:28px;font-weight:500}.nav .num{width:20px;color:#98a2b3}.sidebar-footer{border-top:1px solid var(--line);padding:14px 18px;color:var(--muted);font-size:12px}.sidebar-footer a{color:var(--muted)}
.main{margin-left:300px;min-height:100vh}.topbar{height:68px;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 34px;position:sticky;top:0;z-index:30}.crumb{color:var(--muted);font-size:13px}.crumb strong{color:var(--ink)}.top-link{font-size:13px;font-weight:700}.mobile-menu{display:none;border:1px solid var(--line);background:#fff;border-radius:9px;padding:8px 10px;cursor:pointer}.content{max-width:1120px;margin:0 auto;padding:42px 48px 70px}.article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:44px 52px}.article h1{font-size:38px;line-height:1.18;margin:0 0 14px;letter-spacing:-.03em;color:var(--blue-950)}.lead{font-size:18px;color:#475467;margin:0 0 30px}.article h2{font-size:25px;line-height:1.3;margin:38px 0 12px;color:#16224a}.article h3{font-size:19px;margin:28px 0 10px;color:#22356f}.article h4{font-size:17px;margin:26px 0 8px}.article p{margin:10px 0 15px}.article ul,.article ol{padding-left:24px;margin:10px 0 18px}.article li{margin:6px 0}.article strong{color:#16224a}.hero-image{display:block;max-width:740px;width:100%;margin:28px auto 16px}.article-image{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:12px;margin:20px 0 28px;box-shadow:0 6px 24px rgba(16,24,40,.07);cursor:zoom-in;background:#fff}.article-image:hover{box-shadow:0 9px 30px rgba(16,24,40,.12)}.note{background:#f9fafb;border-left:4px solid var(--blue-600);padding:12px 16px;border-radius:0 8px 8px 0;margin:18px 0}.step{border:1px solid var(--line);border-radius:12px;padding:19px 20px;margin:20px 0;background:#fcfcfd}.step-label{display:inline-flex;background:var(--blue-100);color:var(--blue-900);border-radius:999px;padding:4px 10px;font-size:12px;font-weight:800;margin-bottom:8px}.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:20px 0}.feature{border:1px solid var(--line);border-radius:12px;padding:18px;background:#fff}.feature strong{display:block;margin-bottom:5px}.feature p{font-size:14px;color:var(--muted);margin:0}.video{position:relative;width:100%;padding-top:56.25%;border-radius:14px;overflow:hidden;background:#101828;margin:24px 0;border:1px solid var(--line)}.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.cta{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 15px;border-radius:9px;font-weight:700;font-size:14px;border:1px solid transparent}.btn-primary{background:var(--blue-800);color:#fff}.btn-primary:hover{background:var(--blue-900);text-decoration:none}.btn-secondary{background:#fff;color:var(--blue-900);border-color:#b2ccff}.btn-secondary:hover{background:var(--blue-50);text-decoration:none}.page-meta{display:flex;align-items:center;gap:8px;color:#98a2b3;font-size:12px;margin-bottom:14px}.divider{height:1px;background:var(--line);margin:32px 0}.next-prev{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:40px}.page-nav{border:1px solid var(--line);border-radius:12px;padding:14px 16px;color:var(--ink)}.page-nav:hover{border-color:#b2ccff;background:var(--blue-50);text-decoration:none}.page-nav small{display:block;color:var(--muted)}.page-nav.next{text-align:right}.check-list{list-style:none!important;padding-left:0!important}.check-list li{position:relative;padding-left:26px}.check-list li:before{content:'✓';position:absolute;left:0;color:var(--green);font-weight:900}
.lightbox{position:fixed;inset:0;background:rgba(2,6,23,.88);z-index:100;display:none;align-items:center;justify-content:center;padding:30px}.lightbox.open{display:flex}.lightbox img{max-width:96vw;max-height:92vh;object-fit:contain;border-radius:8px;background:#fff}.lightbox-close{position:absolute;top:18px;right:20px;border:0;background:rgba(255,255,255,.15);color:#fff;width:42px;height:42px;border-radius:50%;font-size:26px;cursor:pointer}.overlay{display:none}
.error-page{min-height:100vh;display:grid;place-items:center;padding:30px}.error-card{max-width:620px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:42px;box-shadow:var(--shadow);text-align:center}.error-code{font-size:70px;font-weight:900;color:var(--blue-800);line-height:1}
@media(max-width:960px){.sidebar{transform:translateX(-100%);transition:.25s}.sidebar.open{transform:translateX(0)}.main{margin-left:0}.mobile-menu{display:block}.topbar{padding:0 18px}.content{padding:24px 18px 50px}.article{padding:30px 26px}.article h1{font-size:32px}.overlay{display:block;position:fixed;inset:0;background:rgba(15,23,42,.42);z-index:40;opacity:0;pointer-events:none;transition:.25s}.overlay.open{opacity:1;pointer-events:auto}}
@media(max-width:620px){.article{padding:24px 18px;border-radius:12px}.article h1{font-size:28px}.article h2{font-size:22px}.lead{font-size:16px}.feature-grid,.next-prev{grid-template-columns:1fr}.topbar{height:60px}.crumb{display:none}.content{padding:16px 10px 40px}.article-image{border-radius:7px}.brand{padding-top:18px}}
@media print{.sidebar,.topbar,.next-prev,.sidebar-footer{display:none!important}.main{margin:0}.content{max-width:none;padding:0}.article{box-shadow:none;border:0;padding:0}.article-image{break-inside:avoid}.video{display:none}}