:root{
  --navy:#07111f; --navy2:#0d1d33; --ink:#16233a; --muted:#5b6b84;
  --blue:#00b4ff; --blue-d:#0284c7; --green:#22c55e; --green-d:#15803d;
  --bg:#f4f7fb; --card:#ffffff; --line:#e3eaf3; --amber-bg:#fff8e6; --amber-line:#f0d98c;
  --radius:16px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.75;font-size:17px}
a{color:var(--blue-d);text-decoration:none}
a:hover{text-decoration:underline}
/* header */
.site-header{background:var(--navy);color:#fff;padding:14px 20px;position:sticky;top:0;z-index:50}
.header-inner{max-width:1020px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:800;font-size:20px;color:#fff;letter-spacing:.2px}
.brand .accent{color:var(--blue)}
.brand:hover{text-decoration:none}
.nav{display:flex;gap:18px;align-items:center}
.nav a{color:#cdd9ea;font-size:15px;font-weight:600}
.nav a:hover{color:#fff;text-decoration:none}
.btn-trial{background:var(--green);color:#fff!important;padding:9px 18px;border-radius:999px;font-weight:700}
.btn-trial:hover{background:var(--green-d);text-decoration:none}
/* hero */
.hero{background:linear-gradient(135deg,var(--navy) 0%,var(--navy2) 60%,#12325c 100%);color:#fff;padding:56px 20px}
.hero-inner{max-width:1020px;margin:0 auto}
.hero h1{font-size:clamp(28px,5vw,44px);line-height:1.25;margin-bottom:12px}
.hero h1 .accent{color:var(--blue)}
.hero p{color:#b9c8de;max-width:640px;font-size:18px}
/* layout */
.wrap{max-width:1020px;margin:0 auto;padding:32px 20px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:22px;margin-top:8px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;box-shadow:0 6px 20px rgba(7,17,31,.06);display:flex;flex-direction:column}
.card .tag{display:inline-block;background:#e6f6ff;color:var(--blue-d);font-size:12.5px;font-weight:700;
  padding:4px 12px;border-radius:999px;margin-bottom:12px;align-self:flex-start}
.card h2{font-size:22px;line-height:1.4;margin-bottom:10px}
.card h2 a{color:var(--ink)}
.card h2 a:hover{color:var(--blue-d);text-decoration:none}
.card p{color:var(--muted);font-size:15.5px;flex:1}
.card .meta{display:flex;gap:14px;color:#8a99b0;font-size:13.5px;margin:16px 0 14px}
.read-link{font-weight:700;color:var(--blue-d)}
/* article */
.article-shell{max-width:780px;margin:0 auto;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);padding:clamp(22px,4vw,48px);box-shadow:0 6px 20px rgba(7,17,31,.06)}
.breadcrumb{font-size:14px;color:var(--muted);margin-bottom:18px}
.breadcrumb a{color:var(--blue-d)}
.article-meta{display:flex;flex-wrap:wrap;gap:14px;color:#8a99b0;font-size:14px;margin:14px 0 6px}
.article-meta .tag{background:#e6f6ff;color:var(--blue-d);font-weight:700;padding:3px 12px;border-radius:999px;font-size:12.5px}
article h1{font-size:clamp(26px,4.6vw,38px);line-height:1.3;color:var(--navy);margin-bottom:6px}
article h2{font-size:24px;color:var(--navy);margin:38px 0 12px;padding-left:14px;border-left:4px solid var(--blue);line-height:1.4}
article h3{font-size:19px;color:var(--navy);margin:28px 0 8px}
article p{margin:0 0 16px}
article ul,article ol{margin:0 0 18px 22px}
article li{margin-bottom:6px}
article blockquote{border-left:4px solid var(--green);background:#f0fdf4;padding:14px 18px;border-radius:0 12px 12px 0;margin:0 0 18px;color:#3c4a61}
article table{display:block;overflow-x:auto;border-collapse:collapse;margin:0 0 20px;max-width:100%}
article th,article td{border:1px solid var(--line);padding:10px 14px;text-align:left;font-size:15px;white-space:nowrap}
article th{background:var(--navy);color:#fff;white-space:nowrap}
article tr:nth-child(even) td{background:#f8fbff}
article td{white-space:normal}
article hr{border:0;border-top:1px solid var(--line);margin:30px 0}
article em{color:#3c4a61}
/* toc */
.toc{background:#f0f7ff;border:1px solid #cfe8fb;border-radius:var(--radius);padding:20px 24px;margin:22px 0 8px}
.toc h2{font-size:16px!important;border:0!important;padding:0!important;margin:0 0 10px!important;color:var(--navy)}
.toc ul{margin:0 0 0 18px!important}
.toc li{margin-bottom:4px!important;font-size:15px}
.toc a{color:var(--ink)}
.toc a:hover{color:var(--blue-d)}
/* disclosure */
.disclosure{background:var(--amber-bg);border:1px solid var(--amber-line);border-radius:12px;
  padding:14px 18px;font-size:14.5px;color:#6b5a2e;margin:18px 0}
/* cta */
.cta-box{background:linear-gradient(135deg,var(--navy),#12325c);color:#fff;border-radius:var(--radius);
  padding:34px 30px;margin:40px 0 10px;text-align:center}
.cta-box h2{color:#fff!important;border:0!important;padding:0!important;margin:0 0 10px!important;font-size:24px}
.cta-box p{color:#c3d2e8;max-width:560px;margin:0 auto 18px}
.cta-btn{display:inline-block;background:var(--green);color:#fff!important;font-weight:800;font-size:18px;
  padding:14px 34px;border-radius:999px;box-shadow:0 8px 22px rgba(34,197,94,.35)}
.cta-btn:hover{background:var(--green-d);text-decoration:none}
.cta-alt{margin-top:14px!important;font-size:14.5px}
.cta-alt a{color:var(--blue)}
/* footer */
.site-footer{background:var(--navy);color:#8fa3bd;padding:34px 20px;margin-top:44px;font-size:14px}
.footer-inner{max-width:1020px;margin:0 auto}
.site-footer a{color:#c3d2e8}
.footer-note{margin-top:12px;color:#6d81a0;font-size:13px;max-width:760px}
@media (max-width:560px){
  body{font-size:16px}
  .nav a:not(.btn-trial){display:none}
  .article-shell{padding:22px 18px}
}