:root {
  --bg: #0a0e1a;
  --fg: #ffffff;
  --accent: #22d3ee;
  --secondary: #38bdf8;
  --magenta: #e879f9;
  --amber: #fbbf24;
  --muted: rgba(255, 255, 255, 0.65);
  --border-subtle: rgba(255, 255, 255, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: 'Zen Kaku Gothic New', 'JetBrains Mono', sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

header {
  display: flex;
  justify-content: flex-end;
  padding: 16px 24px;
}

#lang-toggle {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 14px;
  border-radius: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.3);
  transition: box-shadow 0.2s ease;
}

#lang-toggle:hover {
  box-shadow: 0 0 20px rgba(34, 211, 238, 0.5);
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.hero {
  text-align: center;
  padding: 60px 20px 80px;
  max-width: 760px;
  margin: 0 auto;
}

.kicker {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 16px;
  padding: 4px 10px;
  border: 1px solid rgba(34, 211, 238, 0.35);
  border-radius: 4px;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 52px);
  font-weight: 700;
  margin: 0 0 24px;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.lede {
  font-size: 16px;
  color: var(--muted);
  margin-bottom: 28px;
  line-height: 1.7;
}

.quickstart {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0 auto 34px;
  padding: 1px;
  max-width: 760px;
  background: linear-gradient(90deg, rgba(34, 211, 238, 0.45), rgba(148, 163, 184, 0.18), rgba(232, 121, 249, 0.34));
  border-radius: 10px;
  overflow: hidden;
}

.quickstart li {
  display: grid;
  gap: 4px;
  min-height: 74px;
  padding: 14px 16px;
  text-align: left;
  background: rgba(10, 14, 26, 0.92);
}

.step-kicker {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--accent);
}

.cta {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  padding: 14px 32px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.02em;
  font-size: 15px;
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.45);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 32px rgba(34, 211, 238, 0.6);
}

.cta[aria-busy="true"] {
  opacity: 0.6;
  cursor: progress;
  pointer-events: none;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  padding: 40px 0;
}

.features article {
  border: 1px solid rgba(34, 211, 238, 0.18);
  padding: 24px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
  transition: border-color 0.2s ease;
}

.features article:hover {
  border-color: rgba(34, 211, 238, 0.4);
}

.features h2 {
  margin: 0 0 12px;
  font-size: 17px;
  color: var(--accent);
  font-weight: 600;
}

.features p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.trilogy {
  margin: 60px 0 40px;
  text-align: center;
}

.trilogy h2 {
  margin-bottom: 24px;
  font-size: 18px;
  color: var(--muted);
  font-weight: 500;
}

.trilogy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.trilogy-card {
  border: 1px solid rgba(232, 121, 249, 0.3);
  padding: 22px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--fg);
  background: rgba(232, 121, 249, 0.04);
  transition: border-color 0.2s ease, background 0.2s ease;
  text-align: left;
}

.trilogy-card:hover {
  border-color: var(--magenta);
  background: rgba(232, 121, 249, 0.08);
}

.trilogy-card .kicker {
  color: var(--magenta);
  border-color: rgba(232, 121, 249, 0.35);
  display: inline-block;
  margin-bottom: 10px;
}

.trilogy-card h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.trilogy-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

footer {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.attribution {
  color: rgba(255, 255, 255, 0.45);
  font-size: 11px;
  margin: 4px 0;
  text-align: center;
}

@media (max-width: 640px) {
  .hero {
    padding: 40px 12px 60px;
  }
  .quickstart {
    grid-template-columns: 1fr;
  }
  .quickstart li {
    min-height: auto;
  }
  .features {
    padding: 24px 0;
  }
  main {
    padding: 0 16px 60px;
  }
}