:root {
  --bg: #0b0d12;
  --panel: #121620;
  --text: #f4f6fb;
  --muted: #aeb7c7;
  --line: #273042;
  --accent: #7c9cff;
  --accent2: #a7baff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: radial-gradient(circle at top, #182036 0, var(--bg) 42%);
  color: var(--text);
  font: 16px/1.7 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(1080px, calc(100% - 40px)); margin: auto; }
nav {
  border-bottom: 1px solid var(--line);
  background: rgba(11,13,18,.86);
  backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 10;
}
.nav-inner { display:flex; align-items:center; justify-content:space-between; min-height:68px; gap:20px; }
.brand { font-weight:800; letter-spacing:-.02em; }
.nav-links { display:flex; gap:20px; flex-wrap:wrap; }
.hero { padding: 100px 0 80px; }
.badge { display:inline-block; padding:6px 12px; border:1px solid var(--line); border-radius:999px; color:var(--accent2); background:rgba(124,156,255,.08); font-size:14px; }
h1 { font-size: clamp(42px, 7vw, 72px); line-height:1.03; letter-spacing:-.05em; margin:22px 0; max-width:800px; }
h2 { font-size:30px; line-height:1.2; margin-top:0; }
.lead { color:var(--muted); font-size:20px; max-width:760px; }
.buttons { display:flex; gap:12px; margin-top:30px; flex-wrap:wrap; }
.btn { display:inline-block; padding:12px 18px; border-radius:10px; border:1px solid var(--line); background:var(--panel); color:var(--text); }
.btn.primary { background:var(--accent); color:#0a0d15; border-color:var(--accent); font-weight:700; }
section { padding:70px 0; }
.grid { display:grid; grid-template-columns:repeat(3,1fr); gap:18px; }
.card { background:rgba(18,22,32,.8); border:1px solid var(--line); border-radius:16px; padding:24px; }
.card h3 { margin-top:0; }
.muted { color:var(--muted); }
.prose { max-width:820px; padding:70px 0; }
.prose h1 { font-size:48px; max-width:none; }
.prose h2 { margin-top:40px; font-size:26px; }
.prose ul { padding-left:22px; }
footer { border-top:1px solid var(--line); padding:28px 0; color:var(--muted); }
@media (max-width: 760px) {
  .grid { grid-template-columns:1fr; }
  .nav-inner { align-items:flex-start; padding:14px 0; flex-direction:column; }
  .hero { padding-top:70px; }
}


.youtube-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  padding: 8px 12px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .01em;
}

.yt-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 17px;
  border-radius: 5px;
  background: #fff;
  color: #111;
  font-size: 10px;
}