:root{--bg:#0b1020;--fg:#e9eef5;--muted:#a9b3c9;--acc:#66afe9;--card:#121a33;--border:#1e2a4d;}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,Arial,sans-serif;line-height:1.65}
a{color:var(--acc);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:20px}
.header{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;border-bottom:1px solid var(--border);position:sticky;top:0;background:rgba(11,16,32,.9);backdrop-filter:blur(6px);z-index:10}
.brand{font-weight:800;font-size:1.2rem}
.badge{padding:4px 8px;border:1px solid var(--border);border-radius:10px;font-size:.8rem;color:#fff}
.nav a{margin:0 10px;color:#cfe2ff}
.hero{display:flex;flex-direction:column;gap:20px;margin:24px 0}
@media (max-width:900px){.hero{grid-template-columns:1fr}.nav{display:flex;flex-wrap:wrap}}
.section{margin:28px 0}
.grid{display:flex;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--border);padding:16px;border-radius:16px}
h1,h2,h3{line-height:1.25}
kbd,code{background:#0f1733;padding:1px 6px;border-radius:6px}
footer{border-top:1px solid var(--border);padding:20px;color:var(--muted);font-size:.9rem}
.notice{font-size:.9rem;color:var(--muted);margin-top:6px}
.cta{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;background:var(--acc);color:#081022;padding:10px 14px;border-radius:10px;font-weight:700}
.btn.alt{background:transparent;border:1px solid var(--border);color:#cfe2ff}
.flex{display:flex;gap:16px;flex-wrap:wrap}
.cols{display:flex;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:900px){.cols{grid-template-columns:1fr}}
blockquote{border-left:3px solid var(--border);margin:0;padding:8px 12px;color:#cbd5e1;background:#0e1630;border-radius:6px}
ul{padding-left:20px}
.small{font-size:.9rem;color:var(--muted)}
.cat-list a{display:inline-block;margin:6px 8px 0 0;padding:6px 10px;border:1px solid var(--border);border-radius:999px}
.figure{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:12px}

.hero iframe{width:100%;border:0;margin-bottom:20px;}