:root {
  --bg: #0a0f1e;
  --bg-elevated: #10182b;
  --panel: rgba(16, 24, 43, 0.92);
  --border: rgba(80, 140, 180, 0.28);
  --cyan: #00e8fa;
  --magenta: #f23fb8;
  --amber: #ffc73f;
  --text: rgba(255, 255, 255, 0.94);
  --text-secondary: rgba(255, 255, 255, 0.68);
  --text-muted: rgba(255, 255, 255, 0.42);
  --radius: 16px;
  --max: 760px;
  --font: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(0, 232, 250, 0.12), transparent 55%),
    radial-gradient(ellipse 50% 40% at 100% 50%, rgba(242, 63, 184, 0.08), transparent 50%),
    linear-gradient(rgba(0, 232, 250, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 232, 250, 0.04) 1px, transparent 1px);
  background-size: auto, auto, 28px 28px, 28px 28px;
  pointer-events: none;
}

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: rgba(10, 15, 30, 0.82);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.brand-mark {
  color: var(--cyan);
  text-shadow: 0 0 12px rgba(0, 232, 250, 0.55);
}

.brand-text {
  font-size: 0.85rem;
  font-family: var(--mono);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

.nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--cyan);
}

.hero {
  padding: 2.5rem 0 1.5rem;
}

.eyebrow {
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan);
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.lede {
  margin: 0 0 1.5rem;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  margin: 0;
  padding: 1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.meta div {
  margin: 0;
}

.meta dt {
  font-size: 0.7rem;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.meta dd {
  margin: 0.15rem 0 0;
  font-weight: 600;
}

.card {
  margin: 0 0 1.25rem;
  padding: 1.35rem 1.4rem 1.5rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.card.muted {
  opacity: 0.95;
  border-style: dashed;
}

.card h2 {
  margin: 0 0 0.85rem;
  font-size: 1.25rem;
  color: var(--cyan);
}

.card h3 {
  margin: 1.5rem 0 0.5rem;
  font-size: 1.05rem;
  color: var(--text);
}

.card h4 {
  margin: 1rem 0 0.4rem;
  font-size: 0.95rem;
  color: var(--magenta);
}

.card p,
.card li {
  color: var(--text-secondary);
}

.card p {
  margin: 0 0 0.85rem;
}

.card ul {
  margin: 0 0 0.85rem;
  padding-left: 1.2rem;
}

.card li {
  margin-bottom: 0.35rem;
}

.checklist {
  list-style: none;
  padding-left: 0;
}

.checklist li {
  position: relative;
  padding-left: 1.4rem;
}

.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--cyan);
  font-weight: 800;
}

code {
  font-family: var(--mono);
  font-size: 0.86em;
  color: var(--amber);
  background: rgba(255, 199, 63, 0.08);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  word-break: break-all;
}

a {
  color: var(--cyan);
}

a:hover {
  color: #7af5ff;
}

.note {
  font-size: 0.92rem;
  color: var(--text-muted) !important;
}

.site-footer {
  margin-top: 2rem;
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.site-footer p {
  margin: 0.25rem 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.site-footer .fine {
  font-family: var(--mono);
  font-size: 0.75rem;
}

@media (max-width: 520px) {
  .site-header .wrap {
    flex-direction: column;
    align-items: flex-start;
  }

  .card {
    padding: 1.1rem 1rem 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}