:root {
  --bg: #070b14;
  --bg-soft: #0b1322;
  --surface: #0f1a2e;
  --surface-2: #121f38;
  --border: #1c2a46;
  --text: #e9eefb;
  --text-dim: #9aa8c7;
  --text-faint: #65729225;
  --cyan: #22d3ee;
  --violet: #a78bfa;
  --amber: #fbbf6b;
  --gradient: linear-gradient(135deg, #22d3ee 0%, #818cf8 55%, #a78bfa 100%);
  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 1180px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Manrope", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60% 40% at 15% -5%, rgba(34, 211, 238, 0.16), transparent 60%),
    radial-gradient(50% 35% at 100% 0%, rgba(167, 139, 250, 0.14), transparent 60%),
    var(--bg);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(70% 60% at 50% 0%, black, transparent 80%);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  font-weight: 600;
  text-transform: uppercase;
  margin: 0 0 14px;
}
.eyebrow::before { content: "//"; color: var(--violet); opacity: 0.8; }

h1, h2, h3, h4 { font-family: "Space Grotesk", "Manrope", sans-serif; line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3 { font-size: 1.25rem; }
p { color: var(--text-dim); margin: 0 0 16px; }

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 20, 0.72);
  border-bottom: 1px solid var(--border);
}
.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 19px;
  color: var(--text);
}
.logo .dot {
  width: 10px; height: 10px; border-radius: 3px;
  background: var(--gradient);
  box-shadow: 0 0 16px rgba(34, 211, 238, 0.6);
}
.logo .brand-ai { color: var(--cyan); font-weight: 500; opacity: 0.85; }

nav.main-nav { display: flex; align-items: center; gap: 32px; }
nav.main-nav a {
  font-size: 14.5px;
  color: var(--text-dim);
  font-weight: 600;
  transition: color 0.2s ease;
}
nav.main-nav a:hover, nav.main-nav a.active { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}
.btn-primary {
  background: var(--gradient);
  color: #061018;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 10px 30px -8px rgba(34,211,238,0.45); }
.btn-ghost {
  border-color: var(--border);
  color: var(--text);
  background: rgba(255,255,255,0.02);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle { display: none; }

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 72px;
  text-align: center;
  position: relative;
}
.hero .lede {
  max-width: 640px;
  margin: 0 auto 36px;
  font-size: 18px;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 72px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.hero-stats .stat {
  background: var(--surface);
  padding: 24px 16px;
  text-align: center;
}
.hero-stats .stat b {
  display: block;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.7rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-stats .stat span { font-size: 12.5px; color: var(--text-dim); }

/* ---------- Sections ---------- */
section { padding: 72px 0; }
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.section-head p { max-width: 520px; margin: 0; }

/* ---------- Article cards ---------- */
.grid-articles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  position: relative;
  overflow: hidden;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 211, 238, 0.35);
  box-shadow: var(--shadow);
}
.card .tag {
  display: inline-block;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--violet);
  background: rgba(167, 139, 250, 0.1);
  border: 1px solid rgba(167, 139, 250, 0.25);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 16px;
  width: fit-content;
}
.card h3 { margin-bottom: 10px; }
.card p { font-size: 14.5px; margin-bottom: 20px; flex: 1; }
.card .meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-dim);
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.card .read-more { color: var(--cyan); font-weight: 700; }
.card.featured { grid-column: span 2; }
.card.featured h3 { font-size: 1.6rem; }

/* ---------- Topics / pillars ---------- */
.grid-topics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.topic {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 22px;
}
.topic .icon {
  width: 38px; height: 38px;
  border-radius: 10px;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  margin-bottom: 14px;
}
.topic h4 { margin: 0 0 6px; font-size: 15.5px; font-family: inherit; font-weight: 700; }
.topic p { font-size: 13.5px; margin: 0; }

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute; inset: -40% -10% auto -10%; height: 220px;
  background: radial-gradient(closest-side, rgba(34,211,238,0.18), transparent);
  pointer-events: none;
}
.cta-band h2 { max-width: 560px; margin: 0 auto 14px; }
.cta-band p { max-width: 480px; margin: 0 auto 28px; }

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}
.footer-grid h5 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-dim); margin: 0 0 14px; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-grid a { font-size: 14px; color: var(--text-dim); }
.footer-grid a:hover { color: var(--cyan); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; color: var(--text-dim);
  border-top: 1px solid var(--border);
  padding-top: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Article page ---------- */
.article-hero { padding: 64px 0 32px; }
.article-hero .tag { margin-bottom: 18px; }
.article-meta {
  display: flex; gap: 20px; align-items: center;
  color: var(--text-dim); font-size: 14px; margin-bottom: 8px; flex-wrap: wrap;
}
.article-body {
  max-width: 760px;
  margin: 0 auto;
  padding-bottom: 64px;
}
.article-body h2 { margin-top: 48px; }
.article-body h3 { margin-top: 32px; color: var(--text); }
.article-body p, .article-body li { color: #c4cde3; font-size: 17px; }
.article-body ul, .article-body ol { padding-left: 22px; }
.article-body blockquote {
  margin: 32px 0;
  padding: 20px 24px;
  border-left: 3px solid var(--cyan);
  background: var(--surface);
  border-radius: 0 12px 12px 0;
  color: var(--text);
  font-style: normal;
}
.article-body code {
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
  color: var(--cyan);
}
.lead-text { font-size: 19px !important; color: var(--text) !important; }

.related {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 0 80px;
  border-top: 1px solid var(--border);
}

/* ---------- Page header (non-home) ---------- */
.page-head { padding: 64px 0 24px; text-align: center; }
.page-head p { max-width: 560px; margin: 0 auto; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .grid-articles { grid-template-columns: repeat(2, 1fr); }
  .card.featured { grid-column: span 2; }
  .grid-topics { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  nav.main-nav { position: fixed; inset: 72px 0 0 0; background: var(--bg); flex-direction: column; justify-content: flex-start; padding: 32px 24px; gap: 24px; transform: translateX(100%); transition: transform 0.25s ease; }
  nav.main-nav.open { transform: translateX(0); }
  .nav-toggle { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--border); background: transparent; color: var(--text); }
  .nav-links-desktop { display: none; }
  .grid-articles { grid-template-columns: 1fr; }
  .card.featured { grid-column: span 1; }
  .grid-topics { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .cta-band { padding: 36px 22px; }
  section { padding: 52px 0; }
  .hero { padding: 64px 0 48px; }
}