:root {
  color-scheme: dark;
  --background: #0c1220;
  --surface: rgba(24, 34, 55, 0.8);
  --surface-solid: #182237;
  --text: #f5f7fb;
  --muted: #aeb9cf;
  --accent: #a5b4fc;
  --accent-strong: #c4b5fd;
  --border: rgba(202, 214, 240, 0.16);
  --max-width: 760px;
}

* { box-sizing: border-box; }

html { background: var(--background); }

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 18% -10%, rgba(139, 92, 246, 0.25), transparent 33rem),
    radial-gradient(circle at 95% 0%, rgba(59, 130, 246, 0.14), transparent 28rem),
    var(--background);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

a { color: var(--accent-strong); }

a:focus-visible {
  outline: 3px solid var(--accent-strong);
  outline-offset: 3px;
  border-radius: 4px;
}

.site-header,
main,
.site-footer {
  width: min(calc(100% - 40px), var(--max-width));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-block: 26px;
}

.brand {
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 720;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
}

.nav a {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.nav a[aria-current="page"] { color: var(--text); }

.hero { padding: clamp(48px, 10vw, 94px) 0 50px; }

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-strong);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.18; letter-spacing: -0.035em; }

h1 {
  max-width: 650px;
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 4.7rem);
}

h2 {
  margin: 52px 0 14px;
  font-size: clamp(1.4rem, 4vw, 1.8rem);
}

h3 { margin: 28px 0 8px; font-size: 1.1rem; }

p, li { color: var(--muted); }

.lead {
  max-width: 600px;
  margin: 24px 0 0;
  font-size: clamp(1.08rem, 3vw, 1.3rem);
}

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text);
  font-weight: 650;
  text-decoration: none;
}

.button.primary {
  border-color: transparent;
  background: linear-gradient(135deg, #7c3aed, #4f46e5);
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  padding-bottom: 48px;
}

.card,
.callout {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  backdrop-filter: blur(16px);
}

.card h2 { margin: 0 0 8px; font-size: 1.1rem; }
.card p { margin: 0 0 16px; font-size: 0.95rem; }

.article { padding: 20px 0 64px; }
.article h1 { font-size: clamp(2.1rem, 7vw, 3.5rem); }
.article p:first-of-type { margin-top: 20px; }
.article ul { padding-left: 1.25rem; }
.article li + li { margin-top: 8px; }
.article strong { color: var(--text); }

.callout { margin-top: 28px; }
.callout p { margin: 0; }

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 28px 0 38px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.86rem;
}

.site-footer a { color: var(--muted); }

@media (max-width: 640px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .nav { justify-content: flex-start; }
  .cards { grid-template-columns: 1fr; }
}