:root{
  --bg:#f7f8fb; --panel:#ffffff; --ink:#172033; --muted:#657084; --border:#dfe4ec;
  --accent:#155eef; --accent-soft:#eef4ff; --green:#087443; --amber:#a15c07; --red:#b42318;
  --sidebar:#101828; --sidebar-muted:#98a2b3; --code:#f2f4f7;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;background:var(--bg);color:var(--ink);line-height:1.65}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.layout{display:flex;min-height:100vh}
.sidebar{position:fixed;left:0;top:0;bottom:0;width:300px;background:var(--sidebar);color:white;padding:24px 18px;overflow:auto}
.brand{display:flex;align-items:center;gap:12px;margin-bottom:26px}
.logo{width:38px;height:38px;border-radius:50%;background:radial-gradient(circle at center,#fff 0 18%,#ef4444 19% 37%,#fff 38% 55%,#ef4444 56% 74%,#fff 75%);box-shadow:0 0 0 3px rgba(255,255,255,.08)}
.brand strong{display:block;font-size:18px}
.brand span{display:block;color:var(--sidebar-muted);font-size:12px}
.nav-section{margin:22px 0 8px;color:#d0d5dd;text-transform:uppercase;font-size:11px;letter-spacing:.08em;font-weight:700}
.nav-link{display:block;color:#d0d5dd;border-radius:9px;padding:8px 10px;margin:1px 0;font-size:14px}
.nav-link:hover{background:rgba(255,255,255,.08);color:#fff;text-decoration:none}
.nav-link.active{background:#1d4ed8;color:#fff}
.main{margin-left:300px;width:calc(100% - 300px);padding:42px}
.content{max-width:1040px;margin:0 auto}
.hero{background:linear-gradient(135deg,#0f172a,#1e3a8a);color:#fff;border-radius:22px;padding:42px;margin-bottom:28px;box-shadow:0 22px 60px rgba(15,23,42,.18)}
.hero h1{margin:0 0 14px;font-size:42px;line-height:1.08}
.hero p{margin:0;color:#dbeafe;font-size:18px;max-width:780px}
.page-title{font-size:38px;line-height:1.1;margin:0 0 10px}
.lead{font-size:18px;color:var(--muted);margin:0 0 28px;max-width:850px}
.card{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:26px;margin:0 0 22px;box-shadow:0 2px 10px rgba(16,24,40,.04)}
.card h2{margin-top:0;font-size:25px}
.card h3{margin-top:28px;font-size:19px}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.tile{background:#fff;border:1px solid var(--border);border-radius:16px;padding:20px}
.tile h3{margin:0 0 8px}
.badge{display:inline-block;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:700;background:var(--accent-soft);color:#174ea6}
.badge.green{background:#ecfdf3;color:var(--green)}
.badge.amber{background:#fffaeb;color:var(--amber)}
.badge.red{background:#fef3f2;color:var(--red)}
table{width:100%;border-collapse:separate;border-spacing:0;margin:14px 0;border:1px solid var(--border);border-radius:14px;overflow:hidden;background:white}
th,td{padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:top;text-align:left}
th{background:#f8fafc;font-size:13px;color:#475467}
tr:last-child td{border-bottom:0}
pre,code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace}
pre{background:var(--code);border:1px solid var(--border);padding:16px;border-radius:14px;overflow:auto}
.callout{border-left:4px solid var(--accent);background:var(--accent-soft);padding:15px 18px;border-radius:12px;margin:16px 0}
.callout.warning{border-left-color:#f79009;background:#fffaeb}
.callout.success{border-left-color:#12b76a;background:#ecfdf3}
.steps{counter-reset:step;list-style:none;padding-left:0}
.steps li{counter-increment:step;margin:14px 0;padding-left:46px;position:relative}
.steps li:before{content:counter(step);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--accent);color:white;text-align:center;line-height:30px;font-weight:800}
.footer{color:var(--muted);font-size:13px;margin:34px 0 0;padding-top:18px;border-top:1px solid var(--border)}
@media(max-width:900px){
  .sidebar{position:relative;width:100%;height:auto}
  .layout{display:block}
  .main{margin-left:0;width:100%;padding:22px}
  .grid,.grid-3{grid-template-columns:1fr}
  .hero h1,.page-title{font-size:30px}
}