:root{
  /* Light theme aligned with app accent color */
  --bg: #f7f7fb;
  --bg-soft: #ffffff;
  --card: #ffffff;
  --card-border: #eaecf0;
  --text: #0b0b14;
  --text-dim: #5b5b70;
  --accent: #E20032;
  --shadow: 0 6px 18px rgba(18, 18, 28, 0.06);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background:
    radial-gradient(600px 300px at 10% -10%, #fff 0%, rgba(255,255,255,0) 70%),
    radial-gradient(800px 500px at 120% 10%, #fff 0%, rgba(255,255,255,0) 70%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container{max-width:980px;margin:0 auto;padding:24px}
.header{display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:12px}
.brand__logo{width:36px;height:36px;border-radius:10px;background:var(--accent);display:grid;place-items:center;font-weight:800;color:#fff}
.brand__meta{display:flex;flex-direction:column;line-height:1.1}
.brand__meta span{font-size:12px;color:var(--text-dim)}
.nav a{color:var(--text-dim);text-decoration:none;margin-left:16px;font-weight:600}
.nav a:hover{color:var(--accent)}
main{display:grid;gap:20px}
.card{
  background: var(--card);
  border:1px solid var(--card-border);
  border-radius:16px;
  padding:24px 20px;
  box-shadow: var(--shadow);
}
.card--muted{opacity:.95}
h2{margin:0 0 12px 0;font-size:22px;letter-spacing:.2px}
p{margin:6px 0 12px 0;color:var(--text-dim)}
.list{margin:8px 0 0 18px;color:var(--text-dim)}
.list li{margin:8px 0}
.grid{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));padding-left:18px;margin:8px 0;color:var(--text-dim);line-height:1.6}
details{border-top:1px solid var(--card-border)}
details:first-of-type{border-top:none}
summary{cursor:pointer;padding:12px 0;color:var(--text);font-weight:700;list-style:none}
summary::-webkit-details-marker{display:none}
.content{padding:0 0 14px 0;color:var(--text-dim);line-height:1.7}
.steps{margin:10px 0 0 18px;color:var(--text-dim)}
.code{
  background:#f4f6fb;border:1px solid var(--card-border);
  padding:10px;border-radius:10px;overflow:auto;color:#1f2430
}
.footer{display:flex;justify-content:space-between;align-items:center;color:var(--text-dim);font-size:13px;padding-top:8px}
@media (max-width:720px){
  .nav{display:none}
}