:root{
  --bg:#f6f8fc;
  --panel:#ffffff;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#475569;
  --brand:#16a34a;
  --brand2:#2563eb;
  --warn:#d97706;
  --line:rgba(15,23,42,.10);
  --shadow:0 14px 40px rgba(2,6,23,.10);
  --radius:18px;
  --max:1100px;
  --pad:18px;
  --font: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:linear-gradient(180deg,#ffffff 0%, #f6f8fc 45%, #eef2ff 100%); color:var(--text); font-family:var(--font); line-height:1.55}
a{color:inherit}
img{max-width:100%; height:auto}
.container{max-width:var(--max); margin:0 auto; padding:0 18px}
.topbar{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,.86); backdrop-filter: blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex; align-items:center; justify-content:space-between; gap:14px; padding:12px 0}
.brand{display:flex; align-items:center; gap:10px; text-decoration:none}
.logo{
  width:36px; height:36px; border-radius:12px;
  background: radial-gradient(circle at 30% 30%, var(--brand2), var(--brand));
  box-shadow: 0 8px 22px rgba(37,99,235,.18);
}
.brand span{font-weight:900; letter-spacing:.2px}
.navlinks{display:flex; align-items:center; gap:14px; flex-wrap:wrap}
.navlinks a{color:var(--muted); text-decoration:none; font-weight:750; font-size:14px}
.navlinks a:hover{color:var(--text)}
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  padding:11px 14px; border-radius:14px; border:1px solid var(--line);
  background:#ffffff; color:var(--text);
  text-decoration:none; font-weight:850;
  box-shadow: 0 10px 22px rgba(2,6,23,.06);
}
.btn:hover{transform:translateY(-1px)}
.btn.primary{
  background:linear-gradient(135deg, var(--brand) 0%, var(--brand2) 100%);
  border:none; color:#ffffff;
  box-shadow: 0 14px 26px rgba(22,163,74,.18);
}
.btn.ghost{background:transparent; box-shadow:none}
.pill{
  display:inline-flex; align-items:center; gap:8px;
  border:1px solid var(--line); border-radius:999px; padding:7px 12px;
  color:var(--muted); font-weight:750; font-size:13px;
  background:rgba(255,255,255,.80)
}
.hero{padding:44px 0 24px}
.grid{display:grid; gap:18px}
.heroGrid{grid-template-columns: 1.25fr .75fr; align-items:stretch}
@media (max-width: 900px){
  .heroGrid{grid-template-columns:1fr}
  .navlinks{display:none}
}
.h1{font-size:44px; line-height:1.12; margin:10px 0 10px; letter-spacing:-.7px}
@media (max-width:600px){ .h1{font-size:36px} }
.sub{color:var(--muted); font-size:17px; margin:0 0 18px}
.card{
  background: linear-gradient(180deg, rgba(255,255,255,1), rgba(255,255,255,.98));
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:18px;
}
.card h2,.card h3{margin:0 0 10px}
.kicker{color:var(--muted); font-weight:800; font-size:13px; text-transform:uppercase; letter-spacing:.12em}
.two{grid-template-columns:1fr 1fr}
.three{grid-template-columns:1fr 1fr 1fr}
@media (max-width:900px){ .two,.three{grid-template-columns:1fr} }
.list{margin:10px 0 0; padding:0 0 0 18px; color:var(--muted)}
.section{padding:22px 0}
.section h2{font-size:26px; margin:0 0 10px}
.section p{color:var(--muted); margin:0 0 12px}
.table{
  width:100%; border-collapse:separate; border-spacing:0; overflow:hidden;
  border:1px solid var(--line); border-radius:16px; background:#ffffff
}
.table th,.table td{padding:12px 12px; border-bottom:1px solid var(--line); vertical-align:top}
.table th{color:var(--text); font-size:13px; text-transform:uppercase; letter-spacing:.10em; background:rgba(2,6,23,.03)}
.table tr:last-child td{border-bottom:none}
.badge{display:inline-flex; align-items:center; gap:8px; padding:6px 10px; border-radius:999px; font-weight:900; font-size:12px}
.badge.green{background:rgba(22,163,74,.12); color:#166534; border:1px solid rgba(22,163,74,.25)}
.badge.blue{background:rgba(37,99,235,.12); color:#1e3a8a; border:1px solid rgba(37,99,235,.25)}
.badge.amber{background:rgba(217,119,6,.12); color:#92400e; border:1px solid rgba(217,119,6,.25)}
.note{border-left:4px solid rgba(37,99,235,.85); padding:10px 12px; background:rgba(37,99,235,.08); border-radius:14px; color:var(--muted)}
.footer{padding:28px 0 44px; color:var(--muted); border-top:1px solid var(--line); margin-top:22px; background:rgba(255,255,255,.55)}
.footer a{color:var(--muted)}
.small{font-size:13px; color:var(--muted)}
.hr{height:1px; background:var(--line); margin:14px 0}
.toc a{display:block; padding:8px 10px; border-radius:12px; text-decoration:none; color:var(--muted); border:1px solid transparent}
.toc a:hover{border-color:var(--line); color:var(--text); background:rgba(2,6,23,.03)}
.form{
  display:flex; gap:10px; flex-wrap:wrap; margin-top:10px
}
.input{
  flex:1 1 240px;
  padding:12px 12px;
  border-radius:14px;
  border:1px solid var(--line);
  background:#ffffff;
  color:var(--text);
  box-shadow: 0 10px 22px rgba(2,6,23,.05);
}
.input::placeholder{color:#334155} /* darker placeholder text (requested preference) */