:root {
  --bg: #070b14;
  --bg-elevated: #0d1424;
  --text: #e8eef9;
  --muted: #9aabc8;
  --accent: #7eb8ff;
  --accent-strong: #4d9fff;
  --border: rgba(126, 184, 255, 0.18);
  --radius: 14px;
  --font: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --max: 720px;
}

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  position: relative;
  overflow-x: hidden;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent-strong);
  color: #041018;
  padding: 0.75rem 1rem;
  z-index: 100;
  font-weight: 600;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.stars,
.glow {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
}

.stars {
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255, 255, 255, 0.7), transparent),
    radial-gradient(1px 1px at 70% 20%, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1.5px 1.5px at 40% 70%, rgba(255, 255, 255, 0.55), transparent),
    radial-gradient(1px 1px at 85% 55%, rgba(255, 255, 255, 0.45), transparent),
    radial-gradient(1px 1px at 10% 80%, rgba(255, 255, 255, 0.4), transparent),
    radial-gradient(1.5px 1.5px at 55% 40%, rgba(255, 255, 255, 0.5), transparent),
    radial-gradient(1px 1px at 30% 10%, rgba(255, 255, 255, 0.35), transparent),
    radial-gradient(1px 1px at 90% 85%, rgba(255, 255, 255, 0.4), transparent);
  opacity: 0.55;
}

.glow {
  background:
    radial-gradient(ellipse 60% 40% at 50% -10%, rgba(77, 159, 255, 0.22), transparent 70%),
    radial-gradient(ellipse 40% 30% at 80% 60%, rgba(100, 80, 200, 0.08), transparent 70%);
}

.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--accent), #a78bfa);
  box-shadow: 0 0 18px rgba(126, 184, 255, 0.45);
}

.header-cta {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.header-cta:hover,
.header-cta:focus-visible {
  background: rgba(126, 184, 255, 0.1);
  border-color: rgba(126, 184, 255, 0.4);
  outline: none;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.hero {
  text-align: center;
  padding: 2.5rem 0 3rem;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(126, 184, 255, 0.08);
  border: 1px solid var(--border);
  border-radius: 999px;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  background: linear-gradient(180deg, #fff 20%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.handle {
  margin: 0.85rem 0 0;
  font-size: 1.15rem;
}

.handle a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.handle a:hover,
.handle a:focus-visible {
  text-decoration: underline;
  outline: none;
}

.tagline {
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.lede {
  margin: 1.25rem auto 0;
  max-width: 36rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2rem;
  padding: 0.9rem 1.5rem;
  background: linear-gradient(135deg, var(--accent-strong), #6b8cff);
  color: #041018;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  border-radius: 999px;
  box-shadow: 0 8px 32px rgba(77, 159, 255, 0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.cta:hover,
.cta:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(77, 159, 255, 0.45);
  outline: none;
}

.cta:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

.cta-arrow {
  transition: transform 0.15s ease;
}

.cta:hover .cta-arrow,
.cta:focus-visible .cta-arrow {
  transform: translateX(3px);
}

.topics,
.about {
  margin-top: 2.5rem;
  padding: 1.75rem;
  background: rgba(13, 20, 36, 0.75);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
}

h2 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.topic-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.topic-grid li {
  padding: 1rem;
  background: rgba(7, 11, 20, 0.55);
  border: 1px solid rgba(126, 184, 255, 0.1);
  border-radius: 10px;
}

.topic-grid h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  color: var(--accent);
}

.topic-grid p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
}

.about p {
  margin: 0;
  color: var(--muted);
}

.site-footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid rgba(126, 184, 255, 0.1);
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  text-decoration: underline;
  outline: none;
}

.fineprint {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  opacity: 0.75;
}

@media (max-width: 560px) {
  .topic-grid {
    grid-template-columns: 1fr;
  }

  .site-header {
    padding: 1rem 1.15rem;
  }

  main {
    padding: 1.25rem 1.15rem 3rem;
  }

  .topics,
  .about {
    padding: 1.25rem;
  }
}

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

  .cta,
  .cta-arrow,
  .header-cta {
    transition: none;
  }

  .cta:hover,
  .cta:focus-visible {
    transform: none;
  }
}