:root {
  --bg: #081120;
  --bg-soft: #0d1a2f;
  --surface: rgba(255,255,255,0.05);
  --surface-strong: rgba(255,255,255,0.08);
  --border: rgba(255,255,255,0.12);
  --text: #e8eefc;
  --muted: #aeb9d7;
  --accent: #6fa8ff;
  --accent-2: #7ef0d2;
  --shadow: 0 18px 50px rgba(0,0,0,0.28);
  --radius: 22px;
  --container: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, sans-serif;
  background: radial-gradient(circle at top right, rgba(111,168,255,0.18), transparent 20%), linear-gradient(180deg, #07101d 0%, #0b1424 100%);
  color: var(--text);
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(var(--container), calc(100% - 2rem)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 1000;
  backdrop-filter: blur(16px);
  background: rgba(8,17,32,0.82);
  border-bottom: 1px solid var(--border);
}
.nav-wrap { display:flex; align-items:center; justify-content:space-between; min-height:72px; gap:1rem; }
.brand { font-weight:800; font-size:1.35rem; letter-spacing:.03em; }
.brand span { color: var(--accent-2); }
.nav { display:flex; gap:1.15rem; align-items:center; }
.nav a { color: var(--muted); font-weight:600; }
.nav a:hover, .nav a.active { color: var(--text); }
.menu-btn { display:none; background:none; border:none; color:var(--text); font-size:1.5rem; }
.hero { padding: 4.5rem 0 3rem; }
.hero-grid, .split { display:grid; grid-template-columns: 1.2fr 1fr; gap:2rem; align-items:center; }
.eyebrow { display:inline-block; color: var(--accent-2); font-size:.82rem; text-transform:uppercase; letter-spacing:.14em; font-weight:700; margin-bottom:1rem; }
h1, h2, h3, h4 { line-height:1.15; margin:0 0 .7rem; }
h1 { font-size: clamp(2.2rem, 5vw, 4.2rem); max-width: 13ch; }
h2 { font-size: clamp(1.7rem, 3vw, 2.5rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1rem; color: var(--muted); }
.lead { font-size: 1.08rem; max-width: 64ch; }
.hero-actions, .btn-row { display:flex; flex-wrap:wrap; gap:.9rem; margin: 1.5rem 0; }
.btn {
  display:inline-flex; align-items:center; justify-content:center;
  padding: .95rem 1.25rem; border-radius: 999px; font-weight:700; transition:.2s ease; border:1px solid var(--border);
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: linear-gradient(135deg, var(--accent), #9b8cff); color:#081120; border:none; }
.btn-secondary { background: var(--surface); }
.metric-strip { display:grid; grid-template-columns: repeat(3, 1fr); gap:1rem; margin-top: 2rem; }
.metric-strip div, .card, .topic-card, .section-card, .post-card, .sidebar, .toc, .cta {
  background: var(--surface);
  border:1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.metric-strip div { padding:1rem; }
.metric-strip strong { display:block; font-size:1.1rem; color:var(--text); }
.metric-strip span { color:var(--muted); font-size:.92rem; }
.hero-visual { padding: 1rem; }
.section { padding: 4rem 0; }
.alt { background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0)); }
.section-head { margin-bottom: 1.5rem; max-width: 70ch; }
.card-grid { display:grid; gap:1.2rem; }
.card-grid.four { grid-template-columns: repeat(4, 1fr); }
.card-grid.three { grid-template-columns: repeat(3, 1fr); }
.topic-card, .section-card { padding: 1.35rem; transition:.2s ease; }
.topic-card:hover, .section-card:hover, .post-card:hover { transform: translateY(-4px); border-color: rgba(126,240,210,0.35); }
.post-list { display:grid; gap:1rem; }
.post-card { padding:1.2rem; }
.tag {
  display:inline-flex; padding:.35rem .7rem; border-radius:999px; font-size:.75rem; font-weight:700;
  background: rgba(126,240,210,0.1); color:var(--accent-2); margin-bottom:.8rem;
}
.check-list { padding-left: 1.2rem; color: var(--muted); }
.check-list li { margin-bottom: .55rem; }
.cta { padding:1.5rem; display:flex; justify-content:space-between; gap:1rem; align-items:center; }
.site-footer { border-top: 1px solid var(--border); padding: 2rem 0 3rem; margin-top: 2rem; }
.footer-grid { display:grid; grid-template-columns: 2fr 1fr 1fr; gap: 1rem; }
.footer-grid h4 { margin-bottom: .8rem; }
.footer-grid a { display:block; color: var(--muted); margin-bottom: .45rem; }
.page-hero { padding: 3rem 0 1rem; }
.page-grid { display:grid; grid-template-columns: 280px 1fr; gap:1.5rem; align-items:start; }
.sidebar, .toc { padding:1.2rem; position: sticky; top: 92px; }
.sidebar a, .toc a { display:block; color: var(--muted); padding:.35rem 0; }
.sidebar a:hover, .toc a:hover { color: var(--text); }
.content-card { padding: 1.5rem; background: var(--surface); border:1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.content-card section + section { margin-top: 2rem; padding-top: 2rem; border-top:1px solid var(--border); }
.kicker { color: var(--accent-2); font-weight: 700; }
.two-col { display:grid; grid-template-columns: 1fr 1fr; gap:1rem; }
.callout {
  border-left: 3px solid var(--accent-2);
  padding: 1rem 1rem 1rem 1.1rem;
  background: rgba(126,240,210,0.06);
  border-radius: 14px;
}
.simple-list { padding-left: 1.2rem; color: var(--muted); }
.simple-list li { margin-bottom: .5rem; }
.timeline { display:grid; gap:1rem; }
.timeline .entry { padding:1rem 1.1rem; background:var(--surface); border:1px solid var(--border); border-radius:18px; }
.contact-list a { color: var(--accent-2); }
.table-wrap { overflow-x:auto; }
table { width:100%; border-collapse: collapse; }
th, td { padding:.9rem; border-bottom:1px solid var(--border); text-align:left; }
@media (max-width: 1000px) {
  .card-grid.four, .card-grid.three, .hero-grid, .split, .page-grid, .two-col, .footer-grid { grid-template-columns: 1fr; }
  .metric-strip { grid-template-columns: 1fr; }
  .sidebar, .toc { position: static; }
}
@media (max-width: 760px) {
  .nav { display:none; position:absolute; top:72px; left:0; right:0; padding:1rem; background: rgba(8,17,32,.98); flex-direction:column; border-bottom:1px solid var(--border); }
  .nav.open { display:flex; }
  .menu-btn { display:block; }
  .cta { flex-direction:column; align-items:flex-start; }
}