:root{
  --primary:#0B5FFF;
  --primary-dark:#0847C1;
  --accent:#0FA3B1;
  --ink:#0B1220;
  --ink-soft:#475569;
  --bg:#FFFFFF;
  --bg-soft:#F8FAFC;
  --card:#FFFFFF;
  --border:#E5E7EB;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,'Helvetica Neue',Arial,'Noto Sans',sans-serif;line-height:1.6;color:var(--ink);background:var(--bg)}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-dark);text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:1.25rem}
.header{border-bottom:1px solid var(--border);background:var(--bg-soft)}
.header .brand img{height:32px;vertical-align:middle}
nav ul{display:flex;gap:1rem;flex-wrap:wrap;list-style:none;padding:0;margin:.5rem 0 0 0}
.hero{padding:2rem 0}
.hero h1{font-size:2rem;margin:.25rem 0;letter-spacing:-.01em}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem}
.card{border:1px solid var(--border);border-radius:0.875rem;padding:1rem;background:var(--card);box-shadow:0 1px 2px rgba(0,0,0,.03)}
.badge{display:inline-block;padding:.15rem .5rem;border-radius:999px;background:rgba(15,163,177,.12);color:#0C7F8B;font-size:.8rem}
footer{border-top:1px solid var(--border);margin-top:2rem;padding:1rem 0;color:var(--ink-soft);font-size:.9rem}
.banner{border:1px dashed var(--border);border-radius:.75rem;padding:10px;text-align:center;margin:1rem 0;background:#fff}
.banner.banner-728{display:flex;justify-content:center;align-items:center;padding:0.25rem}
.banner.banner-728 img{display:block;max-width:100%;height:auto}
.sidebar{border-left:1px solid var(--border);padding-left:1rem}
.layout{display:grid;grid-template-columns:1fr;gap:1.5rem}
@media(min-width:980px){.layout{grid-template-columns:3fr 1fr}}
.toc{border:1px solid var(--border);border-radius:.5rem;padding:1rem;background:#fff}
.note{background:#fffbeb;border:1px solid #fce588;border-radius:.5rem;padding:.75rem}
.faq dt{font-weight:600;margin-top:.75rem}
.faq dd{margin:0 0 .5rem 0}

/* Sidebar 300x250 banner style */
.banner.banner-300{margin:1rem 0;text-align:center}
.banner.banner-300 img{max-width:100%;height:auto;border-radius:.5rem}

/* 160x600 sidebar banner */
.banner.banner-160{margin:1rem 0;text-align:center}
.banner.banner-160 img{max-width:100%;height:auto;border-radius:.5rem}